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United S t a t e s Patent [ 1 9 ]

H o l l e r w e g e r e t a 1 .

[ 1 1 ] P a t e n t Number:

[ 4 5 ] Date o f P a t e n t :

4 , 6 7 1 , 2 2 7J u n . 9 , 1 9 8 7

[ 5 4 ] HYDRAULIC ENGINE MOUNT

[ 7 6 ] I n v e n t o r s : H e i n z H o l l e r w e g e r , E f f n e r s t r a s s e 2 0 ,D - 8 0 7 O I n g o l s t a d t ; B o d o A d e n ,

H a u p t s t r a s s e 1 7 , D - 8 0 6 9 K o n i g s f e l d ;G e e r t K u i p e r s , Am i r c h e n w e g 1 a ,D-8070 l n g o l s t a d t ; J o h a n n e s v a n d e n

B o o m , M a r i e L u i s e F l e i s s e r S t r . 1 6 ,D - 8 0 7 3 K o s c h i n g , a l l o f F e d . R e p . o f

G e r m a n y

[ 2 1 ] A p p ] . No: 7 4 1 , 8 6 2

[ 2 2 ] F i l e d : J u n . 6 , 1 9 8 5

[ 3 0 ] F o r e i g n A p p l i c a t i o n P r i o r i t y D a t a

J u n . 7 , 1984 [DE] Fed. Rep. of Germ a ny . . . . . . . 3421135

[ 5 1 ] I n t . C l . 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . 860K / 1 2 ; F 1 6 F 9/10

[ 5 2 ] US. l . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123/192 R; 1 8 0 / 3 1 2 ;2 4 8 / 5 5 0 ; 2 4 8 / 5 6 6 ; 2 4 8 / 6 3 6

[ 5 8 ] F i e l d o f Search . . . . . . . . . . . . . . . . . . . . . . . 123/ 9 5 A, 1 9 2 R;

1 8 0 / 3 1 2 ; 2 4 8 / 5 5 0 , 5 6 6 , 6 3 6

[ 5 6 ] R e f e r e n c e s C i t e d

U . S . PATENT DOCUMENTS

4,154,206 5/1 9 7 9 Le Salver e t a l . . . . . . . . . . . . . . 1 23/ 1 9 2 R4,418,895 1 2 / 1 9 8 3 Bertin e t a l . . . . . . . . . . . . . . . . . . . . . . . . 248/636

22

3 6

20

2 430

2 8

4,428,569 1/ 1 9 8 4 Takei . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 4 8 /636

4,516,545 5/ 1 9 85 Kumagai e t a l . . . . . . . . . . . . . . . . 1 23/ 1 9 5

FOREIGN PATENT DOCUMENTS

584 08 8/ 1 9 82 E u r o p e a n P a t . Off. . . . . . . . . . . . I S O / 312

68395 l/l983 E u r o p e a n P a t . O f f . . . . . . . . . . . . I80/3l2

3222204 12/1983 Fed. Re p. of Germany . . . . . 180/312

P r i m a r y Examiner—lra S . L a z a r u s

A t t o r n e y , A g e n t , o r F irm—Karl Hormann

[ 5 7 ] ABSTRACT

A y d r a u l i c e n g i n e mount c o m p r i s i n g two ? u i d - ? l l e d

c h a m b e r s n o r m a l l y c o m m u n i c a t i n g w i t h e a c h o t h e r t o

a f f e c t a c o n t r o l l e d t h r o t t l e d e x c h a n g e o f ? u i d between

them s u f f i c i e n t t o a b s o r b r e l a t i v e movements o f h i g h

f r e q u e n c y low a m p l i t u d e b e t w e e n a n e n g i n e a n d a c h a s

s i s . R e l a t i v e m o v e m e n t s o f h i gh a m p l i t u d e a n d l o w

f r e q u e n c y may b e a b s o r b e d b y r e n d e r i n g t h e mount o f t

b y o p e n i n g a b y p a s s t o p r o v i d e f o r a s u b s t a n t i a l l y u n i m

p e d e d f l o w o f ? u i d b e t w e e n t h e c h a m b e r s . P r e f e r a b l y ,

t h e b y p a s s i s p r o v i d e d w i t h v a l v e means c o n t r o l l e d b y

s e n s o r s r e a c t i n g t o p a r a m e t e r s r e p r e s e n t i n g e n g i n e p e r

formance or t h e l i k e .

7 C l a i m s , 1 6 D r a w i n g F i g u r e s

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HYDRAULIC ENGINE MOUNT

T h i s a p p l i c a t i o n i s r e l a t e d t o a p p l i c a t i o n S e r . N o .

7 4 1 , 8 7 2 ? l e d J u n e 6 , 1 9 8 5 .

BACKGROUND OF THE INVENTION

The p r e s e n t i n v e n t i o n r e l a t e s t o a p p a r a t u s f o r con

n e c t i n g e l e m e n t s t o g e t h e r , a n d f o r damping o r a b s o r b

i n g r e l a t i v e m o t i o n o c c u r r i n g b e t w e e n s u c h e l e m e n t s .

More p a r t i c u l a r l y , t h e i n v e n t i o n r e l a t e s t o h y d r a u l i c

e n g i n e mounts o f t h e k i n d p r o v i d e d w i t h e x t e r n a l con

t r o l s f o r n e u t r a l i z i n g b y d a m p i n g o r a b s o r b i n g r e l a t i v emovements o f p r e d e t e r m i n e d a m p l i t u d e s between a n

e n g i n e and t h e c h a s s i s o f a n a u t o m o t i v e v e h i c l e .

Automotive e n g i n e s do n o t a l w a y s r u n s m o o t h l y . For

i n s t a n c e , p a r t i c u l a r l y d u r i n g s t a r t i n g , b e f o r e r e a c h i n gt h e i r p r o p e r o p e r a t i n g t e m p e r a t u r e , i n t e r n a l combus

t i o n e n g i n e s may r o c k c o n s i d e r a b l y a n d r u n r o u g h l y .

S u c h r o u g h r u n n i n g p e r f o r m a n c e i s u n p l e a s a n t t o d r i v

e r s , a n d i t i s d e t r i m e n t a l t o t h e v e h i c l e g e n e r a l l y . Att e m p t s h a v e , t h e r e f o r e , b e e n made t o p r o v i d e e n g i n e

mounts c a p a b l e o f damping o r a b s o r b i n g t h e h i g h a m

p l i t u d e s c h a r a c t e r i s t i c o f r o u g h e n g i n e p e r f o r m a n c e .

H y d r a u l i c e n g i n e m o u n t s h a v e b e e n u s e d s u c c e s s f u l l y

t o r e d u c e t h e e f f e c t s o f r o u g h o r r o c k y e n g i n e p e r f o r

mance by damping o r a b s o r b i n g a n d t h u s s u b s t a n t i a l l y

n e u t r a l i z i n g h i g h a m p l i t u d e m o v e m e n t s , b y v a r y i n g t h er e s i l i e n c y o f t h e mounts a s a f u n c t i o n o f p a r t i c u l a r e n

g i n e r u n n i n g c o n d i t i o n s .T h u s , p u b l i s h e d J a p a n e s e P a t e n t A p p l i c a t i o n N o .

5 7 / 7 6 3 4 0 ( A ) d i s c l o s e s a h y d r a u l i c e n g i n e mount c o mp r i s i n g a support connected t o an an chor by means of an

e l a s t i c w a l l m e m b e r . S u p p o r t , a n c h o r a n d w a l l membere n c l o s e a c h a m b e r ? l l e d with a ? u i d . u r t h e r c h a m b e r

o f v a r i a b l e volume and a l s o ? l l e d w i t h a ? u i d , i s con

nected t o a ? r s t chambe r by a passage or conduit w h i c h

p e r m i t s some e x c h a n g e o f ? u i d b e t w e e n t h e c h a m b e r s

t o e q u a l i z e p r e s s u r e d i f f e r e n t i a l s . A a r t i t i o n member

h a v i n g a t h r o t t l e h o l e i s s l i d a b l y mounted w i t h i n a wid

e n e d s e c t i o n o f t h e c o n d u i t . Wh e n t h e s u p p o r t i s s u b

j e c t e d t o v i b r a t i o n s o r movements o f low f r e q u e n c y and

h i g h a m p l i t u d e , t h e e l a s t i c w a l l member i s e l a s t i c a l l yd e f o r m e d a n d t h e c a p a c i t y o f t h e f u r t h e r ? u i d c h a m b e r

i s c h a n g e d c a u s i n g a p r e s s u r e d i f f e r e n t i a l i n t h e ? u i d i nt h e two c h a m b e r s . The p a r t i t i o n member, u n d e r s u c h

c i r c u m s t a n c e s , i s s a i d t o d e s c e n d i n s t a n t l y a n d ? u i d

e x c a p e s from t h e s e c o n d chamber i n t o t h e ? r s t chamber

t h r o u g h a n a r r o w t h r o t t l e h o l e p r o v i d e d i n t h e p a r t i t i o nmember. T h i s r e s u l t s i n some damping o f t h e mov e me n t

owing t o t h e r e s i s t a n c e o f t h e v i s c o u s ? u i d ?owing

t h r o u g h t h e t h r o t t l e h o l e . I n c a s e o f h i g h f r e q u e n c y a n d

l o w a m p l i t u d e m o v e m e n t s , t h e p a r t i t i o n member s s a i dv e r t i c a l l y t o r e c i p r o c a t e b y a c h a n g e i n t h e p r e s s u r e i nt h e ?uid i n t h e chambers t o a b s o r b such minor m o v e

m e n t s . While t h e d e v i c e may o f f e r l i m i t e d r e l i e f from

t h e e f f e c t s o f r e l a t i v e movements o f h i g h a m p l i t u d e

between a n e n g i n e a n d a c h a s s i s , t h e e f f e c t i v e n e s s o f t h e

d e v i c e i s n o t o n l y l i m i t e d b u t i t i s i n any e v e n t u n p r e

d i c t a b l e . A a r i e t y o f h y d r a u l i c e n g i n e m o u n t s o f t h i sk i n d h a s become known. I n p r a x i s u c h mounts have n o t

a l w a y s p e r f o r m e d s a t i s f a c t o r i l y f o r t h e y h a v e b e e nf o u n d s o m e t i m e s t o t r a n s f e r h i g h a m p l i t u d e movements

b e t w e e n t h e e l e m e n t s c o n n e c t e d by t h e m .

I t i s t h e r e f o r e , a n o b j e c t o f t h e i n v e n t i o n t o p r o v i d e

a n i m p r o v e d h y d r a u l i c e n g i n e m o u n t . A more s p e c i ? c

o b j e c t o f t h e i n v e n t i o n r e s i d e s i n t h e p r o v i s i o n o f a

1 5

3 0

3 5

4 5

5 5

6 0

6 5

2h y d r a u l i c e n g i n e mount c a p a b l e o f a b s o r b i n g , o r a t l e a s td a m p i n g , e n g i n e m o v e m e n t s o f h i g h a m p l i t u d e .

Another o b j e c t o f t h e i n v e n t i o n i s t o p r o v i d e a hy

d r a u l i c e n g i n e mount h a v i n g v a r i a b l e movement a b

s o r p t i o n c a p a b i l i t y .F u r t h e r m o r e , t h e i n v e n t i o n h a s a s o n e o f i t s o b j e c t s

t h e p r o v i s i o n o f a h y d r a u l i c e n g i n e mount t h e m o v em e n t a b s o r b i n g c a p a b i l i t y o f w h i c h may b e e f f e c t i v e l yc o n t r o l l e d t o s u i t p a r t i c u l a r r u n n i n g c o n d i t i o n s o f a n

i n t e r n a l c o m b u s t i o n e n g i n e .A u r t h e r o b j e c t o f t h e i n v e n t i o n r e s i d e s i n a n im

p r o v e d h y d r a u l i c e n g i n e mount which may b e con

t r o l l e d by e x t e r n a l c o n t r o l s .

SUMMARY OF THE INVENTION

I n t h e a c c o m p l i s h m e n t o f t h e s e a n d o t h e r o b j e c t s , t h e

i n v e n t i o n p r o v i d e s f o r a h y d r a u l i c e n g i n e mount c o m

p r i s i n g a s u p p o r t m e m b e r adapted t o be connected t o a n

a u t o m o t i v e e n g i n e , a n anchor a d a p t e d t o b e c o n n e c t e d

t o an automotive c h a s s i s , a ? r s t c h a mbe r t h e v o l ume o f

which i s a f f e c t e d by t h e s u p p o r t member a n d which i sa t l e a s t p a r t i a l l y ? l l e d with a ? u i d , a second c h a mbe r a t

l e a s t p a r t i a l l y ? l l e d w i t h a ? u i d a n d b e i n g o f v a r i a b l e

c a p a c i t y , m e a n s p r o v i d i n g a p r e d i c t a b l e t h r o t t l i n g e f

f e c t on ? u i d ?owi n g from t h e ? r s t chamber i n t o t h e

s e c o n d c h a m b e r , a d e ? e c t a b l e e l e m e n t a f f e c t e d by t h e

volume o f t h e ? r s t c h a m b e r , means f o r l i m i t i n g t h e

de?ection of t h e de?ectable element and means f o r

r e n d e r i n g t h e t h r o t t l i n g means i n e f f e c t i v e .T h e s e a n d o t h e r o b j e c t s o f t h e i n v e n t i o n w i l l i n p a r t

b e o b v i o u s a n d w i l l i n p a r t become a p p a r e n t f r o m t h e

d e t a i l e d d e s c r i p t i o n t a k e n t o g e t h e r w i t h t h e a p p e n d e d

d r a w i n g s . The s c o p e o f p r o t e c t i o n s o u g h t , h o w e v e r , i st o b e d e t e r m i n e d s o l e l y by t h e c l a i m s h e r e i n a f t e r s e t

f o r t h .

B R I E F DESCRIPTION OF THE DRAWINGS

F I G . 1 i s a n e q u i v a l e n t f u n c t i o n d i a g r a m e x p l a i n i n g

t h e f u n c t i o n o f e n g i n e m o u n t s i n a c c o r d a n c e w i t h t h e

p r i o r a r t ;FIG. 2 i s t h e c h a r a c t e r i s t i c curve of a d e ? e c t a b l e

member o f s u c h p r i o r a r t e n g i n e m o u n t s ;

FIG. 3 i s a n e q u i v a l e n t f u n c t i o n d i a g r a m o f a n e n g i n e

mount i n a c c o r d a n c e w i t h t h e p r e s e n t i n v e n t i o n ;

FIG. 4 s a d e t a i l o f t h e d i a g r a m o f FIG. 3 ; a n d

F I G S . 5 - 1 4 d e p i c t p r e f e r r e d e m b o d i m e n t s o f t h e

e n g i n e mount i n a c c o r d a n c e w i t h t h e i n v e n t i o n .

DESCRIPTION OF PREFERRED

EMBODIMENTS

FIG. 1 i s a n e q u i v a l e n t f u n c t i o n diagram o f a p r i o r a r t

e n g i n e mount o f t h e k i n d r e f e r r e d t o s u p r a . The c h a r a c

t e r i s t i c s o f t h i s e n g i n e mount a r e d e t e r m i n e d by t h e

f o l l o w i n g p a r a m e t e r s :The d y n a m i c s p r i n g s t i f f n e s s ( e x c l u s i v e o f t h e v o l u m e

s t i f f n e s s o f a s u p p o r t member s e x p r e s s e d b y t h e s p r i n g

c o n s t a n t 0 1 , and p a r a l l e l t o which t h e r e i s c o n n e c t e d t h e

s p r i n g c o n s t a n t 0 1 * r e p r e s e n t i n g t he v o l u m e s t i f f n e s s . I n

t h i s r e s p e c t , t h e r e i s no d i f f e r e n c e b e t w e e n s i n g l e c h a m

b e r a n d d u a l chamber e n g i n e m o u n t s . The s e c o n d

chamber i s s e p a r a t e d f r o m t h e ? r s t chamber by a n e l ement which i s d e ? e c t a b l e by a r e l a t i v e l y weak s p r i n g

f o r c e ; t h u s , a p p l i c a t i o n o f t h e f o r c e on t h e s u p p o r t r es u l t s i n an i n c r e a s e i n t h e p r e s s u r e i n t h e ? r s t chamber

and c a u s e s t h e element t o be d e ? e c t e d . T h i s c h a r a c t e r i s

t i c o f r e s i l i e n c y w h i c h i s p r i m a r i l y d e t e r m i n e d b y t h e

s p r i n g c o n s t a n t o f t h e d e ? e c t a b l e m e m b e r , i s d e p i c t e d

by t h e c o n s t a n t c b . De?ection i n t h e up ward a s w e l l a s

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4 , 6 7 1 , 2 2 75

and t h e r e s i l i e n t m e m b e r 1 1 4 , s e r v e s t o e n c l o s e a space

which may b e ? l l e d by a l i q u i d . T h i s s p a c e i s d i v i d e d

i n t o t w o chambers 122 and 124 by means of a m e m b r a n e

1 2 8 . T h e m e m b r a n e 128 i s h e l d w i t h i n a r e s i l i e n t s t r u c

t u r e 1 2 0 . The s t r u c t u r e 1 2 0 i s p r e f e r a b l y m a d e o f r u b b e r

o r t h e l i k e , a n d r e t a i n s t h e membrane 1 2 8 b y i t s m a r g i n

f o r l i m i t e d f r e e m o v e m e n t normal t o i t s s u r f a c e . Howe v e r , a t l a r g e r d e ? e c t i o n s , t h e m e m b r a n e 1 2 8 e n g a g e s

p r o t r u s i o n s 1 4 0 o r 1 4 2 e x t en d i n g i n w a r d l y o f t h e s t r u c

t u r e 1 2 0 a n d i s t h u s p r e v e n t e d f r o m f u r t h e r d e f l e c t i n g .

Th e m e m b r a n e 1 2 8 m ay b e m a d e e i t h e r o f s t i f f o r o f

e l a s t i c m a t e r i a l . To r e n d e r i t e l a s t i c , i t may b e made, f o r

i n s t a n c e , o f a w e b having a n i n h e r e n t e l a s t i c i t y . P r e f e r a

b l y , t h e membrane 1 2 8 i s made o f web ( F I G . 6 B ) t h e

t h r e a d s o f which may b e o n d u l a t i n g o r crimped t o r e n

d e r them e l a s t i c o r e x t e n s i b l e . When t h e t h r e a d s a r e

s t r e t c h e d t o t h e i r m a x i m u m e x t e n t which p r e f e r a b l y

c o i n c i d e s w i t h t h e engagement of t h e membrane 1 2 8

with a p r o t r u s i o n s 140 o r 1 4 2 , t h e m e m b r a n e 128 can

y i e l d no f u r t h e r . T h u s , a t t h i s i n s t a n c e , t h e membrane128 f u n c t i o n s a s a r e l a t i v e l y s t i f f w a l l between t h e

chambers 1 2 2 and 1 2 4 .

There i s p r o v i d e d w i t h i n t h e s t r u c t u r e 1 2 0 a c o n d u i t

1 4 4 which c o n n e c t s t h e chambers 1 2 2 and 1 2 4 . The

c o n d u i t 144 a c t s a s a t h r o t t l e or d amp i n g member. Thus,

under s t a t i c o r low f r e q u e n c y l o a d s , a n exchange o f

f l u i d between t h e chambers 1 2 2 a n d 1 2 4 i s p o s s i b l e .

However, a t l o a d s o r movements o f h i g h e r f r e q u e n c y ,

t h e e x c h a n g e o f t h e ? u i d between t h e chambers 1 2 2 a n d

1 2 4 becomes r e s t r i c t e d t o t h e p o i n t where t h e r e s i l i e n c y

o f t h e mount a t low a m p l i t u d e s i s d e t e r m i n e d by t h e

e l a s t i c i t y o f t h e m e m b r a n e 1 2 8 . That s t o s a y , t h e mem

b r a n e 1 2 8 w i l l y i e l d i n a d o w n w a r d d i r e c t i o n t o any

l o a de x e r t e d

ont h e

c h a mbe r1 2 2 ,

and i tw i l l y i e l d

toward t h e a n c h o r 1 1 2 u n t i l i t r e a c h e s t h e l i m i t o f i t s

e l a s t i c i t y a t which p o i n t , i t w i l l a b u t a g a i n s t t h e p r o t r u

s i o n 1 4 2 . The r e s i l i e n c y o f t h e mount s t h e n d e t e r m i n e d

b y t h e i n h e r e n t r e s i l i e n c y o f t h e member 1 1 4 , i . e . t h e

mount w i l l t h e n b e r e l a t i v e l y s t i f f .

Wh e n s t a r t i n g t h e e n g i n e o r w h e n t h e e n g i n e i s r u n

n i n g i r r e g u l a r l y f o r a n y r e a s o n , s o t h a t i t g e n e r a t e s

movements o f h i g h a m p l i t u d e s , a s t i f f o r u n y i e l d i n g

mount becomes u n d e s i r a b l e . For t h i s r e a s o n , a b y p a s s

1 5 0 i s p r o v i d e d which c o n n e c t s t h e chamber 1 2 2 w i t h

t h e chamber 1 2 4 . The b y p a s s 1 5 0 i s s u c h t h a t f l u i d may? o w t h r o u g h i t s u b s t a n t i a l l y w i t h o u t r e s t r i c t i o n . S i n c e

t h e b o t t o m w a l l 1 3 4 o f t h e c h a m b e r 1 2 4 s y i e l d a b l e , t h e

chamber 1 2 4 may a b s o r b a n y ? u i d ?owing i n t o i t fromchamber 1 2 2 . The b y p a s s 1 5 0 i s p r o v i d e d w i t h a v a l v e

member ( n o t s h o w n ) which may b e o p e n e d whenever t

i s u n d e s i r a b l e t h a t movements o f l a r g e a m p l i t u d e s a r e

t r a n s f e r r e d t o t h e anchor 1 1 2 . As mentioned a b o v e , t h i s

may b e t h e c a s e , f o r i n s t a n c e , when t h e e n g i n e i s b e i n g

s t a r t e d o r w h e n i t i s r u n n i n g r o u g h l y f o r a n y o t h e r

r e a s o n . As s o o n a s t h e e n g i n e i s r u n n i n g s m o o t h l y , t h e

v a l v e me mbe r i n t h e b y p a s s 1 5 0 may b e c l o s e d a g a i n .

FIG. 7 d e p i c t s a f u r t h e r embodiment o f a h y d r a u l i c

e n g i n e m o u n t . T h i s mount a l s o c o m p r i s e s a s u p p o r t 2 1 0

a s w e l l a s an anc hor 2 1 2 . Th e support 2 10 and t h e an

chor 212 a r e connected t o each o t h e r by an e l a s t i c mem

b e r 2 1 4 . A u i d c o n t a i n e d w i t h i n t h i s mount s s u b s t a n

t i a l l y s e a l e d i n by t h e e l a s t i c member 2 1 4 , i n t o which as u p p o r t me mbe r 1 0 may b e v u l c a n i z e d , b y t h e s u b s t a n

t i a l l y a n n u l a r anchor 212 a s w e l l a s an a n n u l a r e l a s t i c

m e m b e r 234 which i s c o n n e c t e d t o t h e bottom o f t h e

anchor 2 1 2 and which i s p r o v i d e d i n i t s c e n t e r w i t h a

m a s s 240.

2 0

2 5

3 0

6 5

6Th e m ou n t e n c l o s e s t w o chambers 222 and 230 which

a r e s e p a r a t e d f r o m e a c h o t h e r by a diaphragm 2 2 8 . The

d i a p h r a g m 2 2 8 i s m o u n t e d i n s u b s t a n t i a l c o p l a n a r r e l at i o n s h i p t o t h e a n n u l a r anchor 2 1 2 .

The d i a p h r a g m 2 2 8 i s s u b s t a n t i a l l y r i g i d a n d i s p r o

v i d e d w i t h p e r f o r a t i o n s 2 2 6 w h i c h o w i n g t o t h e i r s m a l l

d i m e n s i o n s e x e r t a t h r o t t l i n g a c t i o n on any ? u i d ? o wingfrom t h e chamber 2 2 2 i n t o t h e chamber 2 3 0 . The p e

r i p h e r y o f t h e d i a p h r a g m 2 2 8 i s r e t a i n e d b e t w e e n s o f tl i p m e m b e r s 2 3 6 w h i c h p e r m i t r e l a t i v e l y u n i m p e d e d

mov e me n t o f t h e w a l l m e m b e r 2 2 8 a t low a m p l i t u d e s i n

a d i r e c t i o n s u b s t a n t i a l l y normal t o i t s s u r f a c e . At h i g h e r

a m p l i t u d e s , t h e w a l l m e m b e r 228 m ove s i n t o engage

ment with a n abutment 242 which p r e v e n t s i t s f u r t h e r

m o v e m e n t o r d e ? e c t i o n . The abutment 242 i s p r e f e r a

b l y m a d e o f an e l a s t i c m a t e r i a l s u c h a s r u b b e r .

The mass 240 imbedded i n t h e w a l l 234 o f t h e lower

c h a m b e r 230 s e r v e s a s an absorptive mass w h i c h a t

h i g h e r f r e q u e n c i e s i m p r o v e s t h e a b s o r p t i v e c h a r a c t e r i st i c s o f t h e mount r e l a t i v e t o i t s s t a t i c s t i f f n e s s by v i b r a t »

i n g a t a p h a s e o p p o s i t e t o t h e v i b r a t i o n s i n d u c e d i n t h es u p p o r t 2 1 0 . T h i s p r i n c i p l e o f a b s o r p t i o n i s w e l l k n o w n ,

h o w e v e r , a n d d o e s n o t c o n s t i t u t e p a r t o f t h e i n v e n t i o n

h e r e d e s c r i b e d .

I n a c c o r d a n c e w i t h t h e i n v e n t i o n , t h e r e i s p r o v i d e d

between t h e chambers 222 and 230 a c o n d u i t 250 which

may b e opened by way o f a v a l v e ( n o t shown a t low

e n g i n e r e v o l u t i o n s a n d i t may b e c l o s e d a t h i g h e r e n g i n e

s p e e d s . The d i m e n s i o n s o f t h e c o n d u i t o r b y p a s s 250 a r e

s u c h t h a t a ? u i d may f r e e l y ?ow rom t h e chamber 2 2 2

i n t o t h e c h a m b e r 2 3 0 , w i t h o u t b e i n g i m p e d e d .

A u r t h e r embodiment o f a h y d r a u l i c e n g i n e mount na c c o r d a n c e w i t h t h e i n v e n t i o n i s d e p i c t e d ’ i n FIG. 8 .

H e r e , a s u p p o r t m e m b e r 310 i s connected t o an anchor

312 by means of an e l a s t i c m e m b e r 3 1 4 . The m e m b e r314 may be m a d e o f r u b b e r o r t h e l i k e . I t i s o f s u b s t a n

t i a l l y c y l i n d r i c a l c o n ? g u r a t i o n a n d e n c l o s e s a ? u i d

? l l e d chamber which i s d i v i d e d i n t o two chambers 3 2 2

a n d 3 2 4 by way o f a n e c k e d d o w n p o r t i o n . The t o p o f

t h e mount i s s e a l e d by a p l a t e c o n n e c t e d w i t h t h e s u p

p o r t 3 1 0 . The p l a t e , i n t u r n , i s r i g i d l y c o n n e c t e d t o a

f u r t h e r p l a t e a t t h e bottom o f chamber 324 s o t h a t

mov e me n t o f t h e s u p p o r t m e m b e r 310 w hi c h r e d u c e s

t h e volume o f chamber 3 2 2 i n d u c e s f o r c e d movement na d o w n w a r d d i r e c t i o n o f t h e lower p l a t e , and t h i s r e

s u l t s i n an i n c r e a s e i n t h e volume of chamber 3 2 4 .

Ab o v e t h e chamber 3 2 2 and b e n e a t h t h e chamber 3 2 4

t h e r e a r e p r o v i d e d chambers 3 3 4 . The chambers 334 a r e

e m p t y , i . e . t h e y a r e n o t ? l l e d w i t h l i q u i d . T h e r e f o r e ,movements o f low a m p l i t u d e s do n o t l e a d t o a change i n

t h e volume o f t h e l i q u i d ? l l e d c h a m b e r s . Only mo v e

m e n t s o f h i g h e r a m p l i t u d e s have a n e f f e c t on t h e s u p

p o r t 310 and t h e chambers 322 and 324 i n t h a t p r e s s u r e

w i t h i n chamber 3 2 2 i n i n c r e a s e d a n d p r e s s u r e w i t h i n

chamber 3 2 4 i s r e d u c e d . A h r o t t l e c o n d u i t 3 2 6 i s p r o

v i d e d between t h e chambers 3 2 2 and 3 2 4 by means o f

w h i c h , a t l e a s t u n d e r s t a t i c l o a d s o f low f r e q u e n c y v ib r a t i o n s , t h e p r e s s u r e i n t h e u p p e r a n d l o w e r chambers

3 2 2 a n d 3 2 4 may b e b a l a n c e d by l i m i t e d e x c h a n g e o f

? u i d . The moun t i n t h i s c a s e r e m a i n s r e l a t i v e l y s o f t .

However, i n c a s e t h e ? o w o f ? u i d t h r o u g h t h e t h r o t t l e3 2 6 e x c e e d s t h e c a p a c i t y o f t h e t h r o t t l e , t h e t h r o t t l e 3 2 6

i s r e n d e r e d i n e f f e c t i v e and t h e moun t becomes r e l at i v e l y s t i f f .

When, a s i s t h e c a s e i n h i g h am p l i t u d e v i b r a t i o n s , a

s t i f f m ou n t i s u n d e s i r a b l e , a p a s s a g e or bypass 350 ex

t e n d i n g i n p a r a l l e l t o t h e t h r o t t l e 3 2 6 may b e o p e n e d .

The d i m e n s i o n o f t h e p a s s a g e 3 5 0 i s s u c h t h a t i t p e r m i t s

8/12/2019 Us 4671227


4 , 6 7 1 , 2 2 77

? u i d t o ?ow between t h e chambers 322 and 324 s u b

s t a n t i a l l y u n i m p e d e d l y . As i n t h e e m b o d i m e n t s d e

s c r i b e d a b o v e , a v a l v e ( n o t shown may b e i n c o r p o r a t e d

i n t h e b y p a s s 350 which may b e c l o s e d u n d e r c e r t a i n

o p e r a t i n g c o n d i t i o n s a s , f o r i n s t a n c e , when t h e e n g i n e i s

r u n n i n g s m o o t h l y a t h i g h e r s p e e d s , a n d i t may b e

o p e n e d a t r o u g h e n g i n e p e r f o r m a n c e .

FIGS. 9 A a n d 9 B i l l u s t r a t e f u r t h e r embodiments o f

t h e i n v e n t i o n . I n t h e mounts h e r e shown, mo v e me n ts

are t r a n s f e r r e d f r o m a support member 4 1 0 t o a c u p

s h a p e d anchor 4 1 2 by way o f a n e l a s t i c m e m b e r 4 1 4 .

The e l a s t i c m e m b e r 4 1 4 m ay be m a d e of rubber o r t h e

l i k e a n d i s s u b s t a n t i a l l y b e l l s h a p e d . The m e m b e r 4 1 4

a n d t h e anchor 4 1 2 e n c l o s e a c a v i t y , t h e u p p e r p o r t i o n

o f which i s s e a l e d by a y i e l d a b l e w a l l o r b e l l o w s 4 1 6 .

The c a v i t y e n c l o s e d b y t h e member 4 1 4 a n d t h e b e l l o w s

416 i s f i l l e d w i t h a ? u i d and i s s e p a r a t e d i n t o t w o c h a m

b e r s 4 2 0 a n d 4 2 2 . A i g i d w a l l 4 2 8 i s movably mounted

between t h e chambers 4 2 0 and 4 2 2 . The w a l l 4 2 8 i s

p e r f o r a t e d by a t h r o t t l e c o n d u i t 4 4 0 which c o n n e c t s t h e

chamber 4 2 0 w i t h t h e chamber 4 2 2 . The r i g i d w a l l 4 2 8

i s s u p p o r t e d b y a s o f t l y e l a s t i c s u s p e n s i o n member 4 3 0

which p e r m i t s l i m i t e d mov e me n t o f t h e w a l l 4 2 8 i n

u p p e r a n d l o w e r d i r e c t i o n s . High a m p l i t u d e m ov e

m e n t s , however, c a u s e a p r o t r u s i o n 432 provided on t h e

s u b s t a n t i a l l y c i r c u l a r w a l l 4 2 8 t o engage a b r a c k e t 4 3 6

s u p p o r t i n g t h e s o f t s u s p e n s i o n member 4 3 0 . The w a l l

4 2 8 i s t h e r e f o r e , s u b s t a n t i a l l y b a r r e d f r o m f u r t h e r

movement once t h e p r o t r u s i o n 432 a b u t s a g a i n s t t h e

b r a c k e t 4 3 6 . Th e b r a c k e t 436 may b e m a d e o f r u b b e r

which would p e r m i t a r e s i l i e n t o r g r a d u a l s t o p p i n g o f

t h e mov e me n t o f t h e r i g i d w a l l 4 2 8 .

As i n t h e p r e v i o u s l y d e s c r i b e d e m b o d i m e n t s , t h e r e i s

p r o v i d e d a b y p a s s 4 5 0 ( F I G . 9 A ) o r 4 6 0 ( F I G . 9 B ) . Theb y p a s s 4 5 0 i s p r o v i d e d s u b s t a n t i a l l y i n t h e c e n t e r o f t h e

w a l l 4 2 8 , w h e r e a s t h e b y p a s s 4 6 0 i s l o c a t e d r a d i a l l y

d i s p l a c e d o f t h e w a l l 4 2 8 a n d i s s e a t e d i n s u b s t a n t i a l l y

immovable components o f t h e m o u n t . As i n t h e p r e v i

o u s l y d e s c r i b e d e m b o d i m e n t s , t h e b y p a s s e s 4 5 0 o r 4 6 0

a r e p r o v i d e d w i t h e x t e r n a l l y c o n t r o l l e d v a l v e s ( n o t

shown f o r r e g u l a t i n g t h e ? o w o f ? u i d i n a c c o r d a n c e

w i t h t h e r u n n i n g c o n d i t i o n s o f a n e n g i n e ( n o t s h o w n )

s u p p o r t by t h e m o u n t .

A t i l l f u r t h e r embodiment of a h y d r a u l i c m ou n t i n

accordance w i t h t h e i n v e n t i o n i s sh own i n FIG. 1 0 . The

mount c o m p r i s e s a s u p p o r t m e m b e r 510 which t r a n s f e r s

m o v e m e n t t o an an chor 512 by way of an e l a s t i c mem

b e r 5 1 4 . The l a s t i c m e m b e r 514 may b e m a d e o f r u b b e r

o r t h e l i k e a n d i s o f c u p - s h a p e d c o n ? g u r a t i o n . I t i s

s e a l e d a t t h e bottom by a w a l l m e m b e r 516 w i t h which

i t f o r m s a ? u i d chamber w i t h i n which t h e r e i s p r o v i d e d

a diaphragm 5 1 8 . The diaphragm 5 1 8 i s c o n n e c t e d t o

t h e anchor 5 1 2 by way o f a b e l l o w s 5 2 0 , and i t i s a l s o

connected t o t h e s u p p o r t 514 by means o f a b r i d g e

member 5 3 2 . Movement o f t h e s u p p o r t 5 1 4 t h u s i n d u c e s

f o r c e d movement i n t h e diaphragm 5 1 8 . S i n c e t h e d i a

ph ragm s e p a r a t e s t h e ? u i d chamber i n t o two c h a m b e r s

5 2 2 and 5 2 4 , movement o f t h e diaphragm 5 1 8 l e a d s t o

an enlargement of one of h e chambers 522 or 524 on t h e

one h a n d and t o a r e d u c t i o n i n t h e s i z e of t h e o t h e r

chamber o n t h e o t h e r h a n d . For b a l a n c i n g t h e c h a n g e i nv o l u m e , t h e r e i s p r o v i d e d i n t h e c e n t e r o f t h e d i a

phr a gm 5 1 8 a me mbr a n e 5 2 8 which i s d e ? e c t a b l e i nupward a n d d o w n w a r d d i r e c t i o n s . The membrane 5 2 8

i s r e t a i n e d i n a r i g i d a n n u l a r p o r t i o n o f t h e d i a p h r a g m

5 1 8 . With l a r g e r d e ? e c t i o n s , t h e membrane 5 2 8 i s

f o r c e d i n t o engagement w i t h a n a b u t m e n t . T h u s , i t s

d e ? e c t i o n i s l i m i t e d , and a f u r t h e r exchange o f ? u i d

O

5

2 0

45

6 0

6 5

8between t h e chambers 5 2 2 and 5 2 4 may t a k e p l a c e

t h r o u g h a t h r o t t l i n g c o n d u i t 5 4 0 o n l y . At h i g h f r equency movements very l i m i t e d ?ow f ? u i d o n l y m ay

t a k e p l a c e b e t w e e n t h e chambers 5 2 2 a n d 5 2 4 t h r o u g h

t h e c o n d u i t 5 4 0 . T h e r e f o r e , t h e mount r e m a i n s r e l a

t i v e l y s t i f f .I n order t o a v o i d t h e s t i f f n e s s o f t h e m ou n t d u r i n g

c e r t a i n o p e r a t i n g c o n d i t i o n s , a l a r g e c o n d u i t 5 5 0 i s p r o

v i d e d between t h e ? u i d c h a mbe r 5 2 2 and 5 2 4 . The

c o n d u i t o r b y p a s s 550 may be l o c a t e d a t t h e j u n c t i o n

between t h e w a l l 5 2 8 a n d t h e b e l l o w s 5 2 0 . The b y p a s s

5 5 0 may b e opened and c l o s e d by a v a l v e ( n o t shown a s

r e q u i r e d t o s u i t t h e o p e r a t i n g c o n d i t i o n s o f a n e n g i n e

( n o t s h o w n ) . I n f a c t , a n o p e r a t i n g p a r a m e t e r o f t h e

e n g i n e may b e u s e d t o c o n t r o l t h e s i z e o f t h e c o n d u i t

5 5 0 b y r e g u l a t i n g t h e v a l v e . As i n t h e p r e v i o u s l y d e

s c r i b e d e m b o d i m e n t s , t h e r e v o l u t i o n s o f t h e e n g i n e mayb e drawn u p o n t h e r e g u l a t e t h e v a l v e b y a p p r o p r i a t e

c o n t r o l c i r c u i t s ( n o t s h o w n ) . The v a l v e o r b y p a s s 5 5 0

may t h u s r e m a i n e d c l o s e d w h e n a n e n g i n e i s r u n n i n g

above a predetermined s p e e d , and ? u i d may be e x

changed b e t w e e n t h e c h a m b e r s 5 2 2 a n d 5 2 4 o n l y

t h r o u g h t h e t h r o t t l e 5 4 0 . At low e n g i n e s p e e d s , i . e . a te n g i n e m o v e m e n t s a t h i g h a m p l i t u d e , t h e b y p a s s 5 5 0

may b e o p e n e d , and t h e t h r o t t l e 5 4 0 i s t h u s r e n d e r e d

i n e f f e c t i v e a s s u b s t a n t i a l l y u n i m p e d e d ? o w o f ? u i d

between t h e chambers 5 2 2 a n d 5 2 4 may t h e n t a k e p l a c e

t h r o u g h t h e b y p a s s 5 5 0 . H e n c e , t h e mount would r e

m a i n s o f t , i . e . c a p a b l e o f a b s o r b i n g e n g i n e m o v e m e n t so f h i g h a m p l i t u d e s , u n d e r c o n d i t i o n s which would n o r

m a l l y c a u s e t h e m e m b r a n e 528 t o m o v e a g a i n s t t h e

abutment 5 2 6 i f i t were n o t f o r t h e opened b y p a s s 5 5 0 .

Reference i s ow m a d e t o t h e embodiment o f FIG.

1 1 . The h y d r a u l i c e n g i n e mount o f F I G . 1 1 d i f f e r s f r o m

t h e p r e v i o u s l y d e s c r i b e d o n e s i n t h a t t h e d e v i c e f o r

r e n d e r i n g a t h r o t t l e c o n d u i t i n e f f e c t i v e i s n o t a b y p a s s

between t w o ? u i d ? l l e d c h a m b e r s . I n s t e a d , t h i s embodi

ment i s c o n s t r u c t e d t o f u n c t i o n i n t h e f o l l o w i n g m a n

ner:

Vibrations or m o v e m e n t s are t r a n s f e r r e d f r o m a sup

p o r t 6 1 0 t o a n anchor 6 1 2 . The s u p p o r t 610 and t h e

anchor 612 a r e connected t o each o t h e r by an e l a s t i c

m e m b e r 614 and by a w a l l 6 1 6 . The anchor 612 i s

shaped l i k e a bowl and i s s e a l e d by an e l a s t i c w a l l o r

b e l l o w s 6 1 8 . The p e r i p h e r y o f t h e w a l l 6 1 8 i s a f f i x e d t o

an upper r i m of t h e anchor 6 1 2 , and t h e c e n t e r o f t h e

w a l l 6 1 8 i s a f ? x e d t o t h e s u p p o r t 6 1 0 . T h e r e f o r e , m o v e

ment i s i m p a r t e d t o t h e w a l l 6 1 8 whenever t h e s u p p o r t

610 o r t h e anchor 612 i s moved. The i n t e r i o r of t h e

anchor 612 i s ? l l e d with water o r s i l i c o n . S i n c e t h e

volume o f t h e anchor 6 1 2 i s v a r i a b l e b e c a u s e o f t h e

e l a s t i c i t y o f t h e w a l l 6 1 8 , t h e s t a t i c s t i f f n e s s o f t h e

mount i s s u b t a n t i a l l y a f u n c t i o n o f t h e e l a s t i c m e m b e r

6 1 4 c o n n e c t i n g t h e s u p p o r t 6 1 0 a n d t h e a n c h o r 6 1 2 .

However, t h e dynamic t i f f n e s s o f t h e moun t s a l s o a

f u n c t i o n o f i t s i n t e r i o r c o n s t r u c t i o n f o r t h e s u p p o r t 6 1 0

e x t e n d s i n t o t h e ?uid chamber by means o f an e x t e n s i o n

6 1 1 . At t h e e n d o f t h e e x t e n s i o n 6 1 1 o f t h e s u p p o r t 6 1 0

t h e r e i s a f f i x e d a p l a t e m e m b e r 624 by means o f which

t h e ? u i d chamber i s d i v i d e d i n t o t wo s e c t i o n s 620 and

6 2 2 . Movement o f t h e e x t e n s i o n 6 1 1 o f t h e s u p p o r t 6 1 0

r e s u l t s i n v e r t i c a l movement o f t h e p l a t e 6 2 4 w h i c h ,

d e p e n d i n g upon t h e d i r e c t i o n o f t h e movement, c a u s e s

t h e s e c t i o n s 620 and 622 e i t h e r t o i n c r e a s e o r t o d e c r e a s e

i n s i z e , o r v i c e v e r s a . The p l a t e 6 2 4 i s s l i d a b l y p o s i t i o n e d

between t w o abutment c o l l a r s 626 and 628 af?xed t o t h e

e x t e n s i o n 6 1 1 . Thus t h e e x t e n s i o n 6 1 1 m ay e x e c u t e

s m a l l movements w i t h o u t t h e p l a t e 624 moving a s t h e r e

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4 , 6 7 1 , 2 2 7

i s some f r e e p l a y between t h e p l a t e 624 and t h e a b u t

ment 626 and 6 2 8 . Only w h e n t h e e x t e n s i o n 6 1 1 e x e

~ c u t e s l a r g e movements does t h e p l a t e 624 engage one o r

t h e o t h e r o f t h e a b u t m e n t s 6 2 6 and 6 2 8 and i s t h u s

moved w i t h i n t h e ? u i d . The p l a t e 6 2 4 i s o f c i r c u l a r

c o n ? g u r a t i o n a n d i t s d i a m e t e r i s s l i g h t l y l e s s t h a n t h e

i n t e r n a l d i a m e t e r o f t h e anchor 6 1 2 . T h i s l e a v e s a s m a l lgap 6 3 0 between t h e i n t e r n a l w a l l o f t h e anchor 6 1 2 and

t h e p e r i p h e r y o f t h e p l a t e 6 2 4 , a n d t h i s g a p p e r m i t s

l i m i t e d ?ow f ? u i d between t h e chambers 620 and 6 2 2 .

S i n c e t h e u p p e r chamber 6 2 0 i s s e a l e d by t h e w a l l 6 1 8 ,

upward mov e me n t o f t h e s u p p o r t 6 1 0 a n d t h e e x t e n s i o n

c o u l d i n c r e a s e t h e volume o f t h e chamber 6 2 0 . How

e v e r , r e s u l t a n t n e g a t i v e p r e s s u r e i n t h e lower chamber

622 would c a u s e ? u i d s l o w l y t o e s c a p e from c h a mbe r

6 2 0 t h r o u g h t h e a n n u l a r t h r o t t l e g a p 6 3 0 i n t o t h e cham

b e r 6 2 2 and t h u s r e s t o r e a p r e s s u r e b a l a n c e i n t h e ? u i d .

C o m p u l s o r y ? o w o f ? u i d t h r o u g h t h e t h r o t t l i n g g a p

6 3 0 may b e a v o i d e d i n t h e f o l l o w i n g m a n n e r : There i s

p r o v i d e d w i t h i n t h e chamber 6 2 2 a c o m p r e s s i b l e cap

s u l e 6 5 0 c o m p r i s i n g two r i g i d d i s c s 654 and 6 5 6 conn e c t e d t o e a c h o t h e r a l o n g t h e i r m a r g i n s by a n e l a s t i c

s l e e v e 6 5 2 . The c a p s u l e 6 5 0 which a s shown i s mounted

on t h e e x t e n s i o n 6 1 1 , i s c o n t r o l l a b l e by a c o n d u i t 658

l e a d i n g t o t h e e x t e r i o r o f t h e mount and connected t o

a p p r o p r i a t e c o n t r o l s ( n o t s h o w n ) . T h a t i s t o s a y , t h e

i n t e r n a l p r e s s u r e w i t h i n t h e c a p s u l e 6 5 0 may b e

c h a n g e d by way o f t h e c o n d u i t 6 5 8 . By low p r e s s u r e

w i t h i n t h e c a p s u l e 6 5 0 h i g h p r e s s u r e w i t h i n t h e c h a mb e r 6 2 2 c a u s e d by d o w n w a r d mov e me n t o f t h e s u p p o r t

6 1 0 may b e b a l a n c e d by c o m p r e s s i o n o f t h e c a p s u l e 6 5 0 .

T h e r e f o r e , t h e s u b s t a n t i a l l y i n c o m p r e s s i b l e ? u i d w i t h i n

t h e chamber 622 need n o t ?ow i n t o t h e chamber 620

t h r o u g h t h e g r a p 6 3 0 . O n t h e o t h e r h a n d , when t h e

s u p p o r t 6 1 0 moves u p w a r d l y , low p r e s s u r e i n t h e ? u i do f t h e c h a m b e r 6 2 2 may b e c o m p e n s a t e d b y e x p a n s i o n

o f t h e c a p s u l e 6 5 0 . Fl ow o f ? u i d f r o m t h e chamber 6 2 0

i n t o t h e chamber 6 2 2 t h r o u g h t h e g a p 6 3 0 i s t h u s s u b

s t a n t i a l l y avoided a s w e l l .

B y pumping a g a s e o u s o r a l i q u i d m e d i u m i n t o t h e

c a p s u l e 6 5 0 a t h i g h p r e s s u r e b a l a n c i n g o f t h e v o l u m e

w i t h i n t h e chamber 6 2 2 by way o f t h e c a p s u l e 6 5 0 i s no

l o n g e r p o s s i b l e o r a t b e s t i t i s p o s s i b l e t o a v e r y l i m i t e d

d e g r e e o n l y ; b a l a n c e o f ? u i d p r e s s u r e i n t h e c h a m b e r s

6 2 0 a n d 6 2 2 c a n t h e n b e a c c o m p l i s h e d o n l y by t h e ? o wo f f l u i d t h r o u g h t h e g a p 6 3 0 .

As w i l l b e a p p r e c i a t e d b y t h o s e s k i l l e d i n t h e a r t , t h e

t h r o t t l e a c t i o n o f t h e g a p 6 3 0 i n t h i s embodiment i s

r e n d e r e d i n e f f e c t i v e b y s e l e c t i n g p r e s s u r i z i n g o r d e ? a ti n g t h e c a p s u l e 6 5 0 . A c t i v a t i o n o r d e a c t i v a t i o n o f t h e

t h r o t t l e 630 can be m a d e dependent upon, o r m ay be

c o n t r o l l e d b y , p a r a m e t e r s s i m i l a r t o t h o s e d e s c r i b e d i nt h e p r e v i o u s embodiments. For t h i s p u r p o s e , t h e con

d u i t 6 5 8 , a s s t a t e d a b o v e , i s c o n n e c t e d t o a p p r o p r i a t e

c o n t r o l s .

F I G . 1 2 d e p i c t s a f u r t h e r h y d r a u l i c e n g i n e mount i na c c o r d a n c e w i t h t h e i n v e n t i o n . The moun t c o m p r i s e s a

s u p p o r t 710 connected t o an anchor 712 by means of an

e l a s t i c m e m b e r 7 1 4 . There s e n c l o s e d w i t h i n t h e mount

a l i q u i d - ? l l e d chamber which i s d i v i d e d i n t o t w o s e c

t i o n s 7 2 0 a n d 7 2 2 by a w a l l me mbe r 7 1 8 . The chamber

i s ? l l e d w i t h a ? u i d and i s a t i t s lower end c l o s e d by an

e l a s t i c w a l l 7 1 3 . The l a s t i c w a l l 7 1 3 i s c o n n e c t e d t o t h ea n c h o r 7 1 2 . At i t s u p p e r e n d , t h e chamber i s c l o s e d by

t h e e l a s t i c member 7 1 4 . A l u n g e r 7 1 6 c o n n e c t s t h e

e l a s t i c m e m b e r 714 with a w a l l 713 i n such a way h a t

t h e y m u s t mo v e t o g e t h e r . The p l u n g e r 7 1 6 e x t e n d s

t h r o u g h a n o p e n i n g o f t h e w a l l 7 1 8 . The w a l l 7 1 8 i s

20

2 5

30

3 5

4 5

5 5

6 5

1 0s u p p o r t e d a t i t s p e r i p h e r a l m a r g i n b y two a b u t m e n t s

728 and 7 3 0 , b o t h o f which a r e connected t o t h e anchor

7 1 2 . R e l a t i v e mov e me n t between t h e s u p p o r t 7 1 0 and

t h e anchor 712 c a u s e s t h e volume o f t h e chamber 720

and/or 7 2 2 t o c h a n g e , a n d a t mov e me n t o f low a m p l i

t u d e t h e c h a n g e may b e c o m p e n s a t e d w i t h i n t h e l i m i t s

o f f r e e p l a y between t h e w a l l 7 1 8 a n d t h e a b u t m e n t s 7 2 8a n d 7 3 0 . At movements o f h i g h e r a m p l i t u d e s , ? u i d may

? o w t h r o u g h a narrow gap s u r r o u n d i n g t h e p l u n g e r 7 1 6

i n a n openin g 636 of t h e w a l l 7 1 8 . This g a p a c t s a s a

t h r o t t l e w h i c h renders the m o u n t very s t i f f a s soon a s

t h e ? o w o f ? u i d e x c e e d s t h e ? o w - t h r o u g h c a p a c i t y o f

t h e g a p .

To r e l i e v e t h e t h r o t t l e g a p , a c o n d u i t 750 i s p r o v i d e d

between t h e chambers 7 2 0 and 7 2 2 . The c o n d u i t 7 5 0

b y p a s s e s t h e w a l l 7 1 8 a n d i s p r o v i d e d w i t h a s e l e c t i v e l y

c o n t r o l l a b l e v a l v e ( n o t s h o w n ) f o r o p e n i n g a n d c l o s i n g

t h e c o n d u i t 750 i n response t o p a r a m e t e r s , such a s en

g i n e r e v o l u t i o n s , i n a manner s i m i l a r t o t h e embodi

ments d e s c r i b e d a b o v e , t o render t h e mo un t s o f t or s t i f f

d e p e n d i n g u p o n e n g i n e p e r f o r m an c e .

A u r t h e r embodiment o f t h e i n v e n t i o n which i n i t s

c o n s t r u c t i o n s u b s t a n t i a l l y c o r r e s p o n d s t o t h e mounts

r e f e r r e d t o a b o v e , i s d e p i c t e d i n FIG. 1 3 . Two ? u i d

chambers 8 1 0 and 8 1 2 a r e s e p a r a t e d from e a c h o t h e r by

a d e ? e c t a b l e w a l l 8 1 4 . A b y p a s s 8 1 6 i s p r o v i d e d f o r

s e l e c t i v e l y c o n n e c t i n g t h e c h a m b e r s 8 1 0 a n d 8 1 2 w i t h

e a c h o t h e r . A a l v e 8 1 8 s e a t e d w i t h i n t h e b y p a s s 816

b l o c k s ? u i d from ?owing between t h e chambers 8 1 0

a n d 8 1 2 t h r o u g h t h e b y p a s s 8 1 6 w h e n t i s s h u t . Wh e no p e n , t h e v a l v e 8 1 8 p r o v i d e s f o r s u b s t a n t i a l l y unim

peded f l o w o f ? u i d between t h e chambers 8 1 0 and 8 1 2 .

The v a l v e 8 1 8 i s c o n t r o l l e d by a n e l e c t r o m a gn e t 8 2 0

w h i c h , i n t u r n , may b e c o n t r o l l e d b y t h e s p e e d o f t h e

e n g i n e ( n o t s h o w n ) .Yet a n o t h e r embodiment i s shown i n FIG. 1 4 . I n t h i s

c a s e , t o o , t h e mount c o m p r i s e s two ? u i d - ? l l e d c h a m

b e r s 910 and 912 which a r e k e p t s e p a r a t e from e a c h

o t h e r by a d e ? e c t a b l e e l e m e n t 9 1 4 . Within t h e e l e m e n t

9 1 4 t h e r e i s s e a t e d a m e m b r a n e 9 1 6 , one s u r f a c e of

which s a f f e c t e d b y t h e volume o f t h e chamber 9 1 0 ; t h e

o t h e r s u r f a c e f a c e s an empty chamber 918 embedded

between t h e membrane 9 1 6 and t h e e l e m e n t 9 1 4 . The

chamber 9 1 8 may be c o n n e c t e d t o a t m o s p h e r i c p r e s s u r e

by a c o n d u i t 9 2 0 . Wh e n t h e chamber s t h u s c o n n e c t e d ,

t h e membrane 9 1 6 i s r e l a t i v e l y e l a s t i c a n d may b e d e

? e c t e d b y v a r i a t i o n s o f t h e p r e s s u r e w i t h i n t h e chamber

9 1 0 . The d e ? e c t a b l e e l e m e n t 9 1 4 i s n o ta f f e c t e d

by s u c hp r e s s u r e v a r i a t i o n s a s t h e y w i l l b e a b s o r b e d by t h e

membrane 9 1 6 . By c o n n e c t i n g t h e c o n d u i t 9 2 0 t o v a c

u u m p r e s s u r e , i n s t e a d o f a t m o s p h e r i c p r e s s u r e , t h e

me mbr a n e 9 1 6 , b e c a u s e o f t h e r e s u l t a n t v a cuum p r e s

s u r e w i t h i n t h e chamber 9 1 8 , w i l l m o v e i n t o engage

ment w i t h t h e d e ? e c t a b l e me mbe r 9 1 4 . A c c o r d i n g l y ,

t h e e l a s t i c i t y o f t h e membrane 9 1 6 i s r e n d e r e d i n e f f e c

t i v e , and t h e mount t h e n f u n c t i o n s i n t h e m a n n e r o f a

c o n v e n t i o n a l d u a l c h a m b e r h y d r a u l i c e n g i n e m o u n t .

That i s t o s a y , p r e s s u r e i m b a l a n c e s between t h e c h a m

b e r s 9 1 0 a n d 9 1 2 a r e e q u a l i z e d by d e ? e c t i o n o f t h e

m o v a b l e e l e m e n t 9 1 4 a n d / o r b y t h r o t t l e c o n d u i t s ( n o t

s h o w n ) .

A d v a n t a g e o u s l y , t h e chamber 9 1 8 i s c o n n e c t e d t oa t m o s p h e r i c p r e s s u r e a t l o w e n g i n e s p e e d s , s i n c e i n t h i smanner t h e mount i s r e n d e r e d s o f t f o r t h e m e m b r a n e

9 1 6 e f f e c t i v e l y a b s o r b s movements o f h i g h a m p l i t u d e .

V a c u u m r e s s u r e i s a p p l i e d t o t h e c h a m b e r 918 once t h e

e n g i n e i s r u n n i n g f a s t e r a n d s m o o t h e r ; t h e membrane

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4 , 6 7 1 , 2 2 71 1

9 1 8 i s t h u s r e n d e r e d i n e f f e c t i v e b y engagement w i t h t h e

d e ? e c t a b l e e l e m e n t 9 1 4 .

As w i l l b e a p p a r e n t t o p e r s o n s s k i l l e d i n t h e a r t , t h e

v a r i o u s e m b o d i m e n t s o f h y d r a u l i c e n g i n e m o u n t s h e r e

d e c r i b e d a n d i n c o r p o r a t i n g t h e p r i n c i p l e s o f t h e i n v e n

t i o n a r e by no m e a n s e x h a u s t i v e . O th er c o n s t r u c t i o n s

e m b o d y i n g t h e i n v e n t i o n s may b e p r o v i d e d . M o r e o v e r ,

i t w i l l b e a p p a r e n t t h a t o p e n i n g a n d c l o s i n g o f t h e b y

p a s s n e e d n o t n e c e s s a r i l y b e c o n t r o l l e d by s u c h parame

t e r s a s t h e s p e e d o f t h e e n g i n e . R a t h e r , t h e b y p a s s may

b e a r r a n g e d whenever t h e mount becomes t o o h a r d , i . e .

w h e n e ve r a s o f t e r r e s p o n s e of t h e m ou n t i s d e s i r a b l e .

Those s k i l l e d i n t h e a r t w i l l k n o w s e n s o r s and c o n t r o l

c i r c u i t r y s u i t e d t o r e n d e r t h e h y d r a u l i c e n g i n e mount

a p p r o p r i a t e l y o p e r a t i o n a l f o r a b s o r b i n g , n e u t r a l i z i n g , o r

a t l e a s t r e d u c i n g t h e e f f e c t s o f e n g i n e movements o f

h i g h a m p l i t u d e .What i s c l a i m e d i s :

1 . An a p p a r a t u s f o r s e l e c t i v e l y a b s o r b i n g r e l a t i v e

m o v e m e n t s o f h i g h a m p l i t u d e a n d l o w f r e q u e n c y b etween two e l e m e n t s , c o m p r i s i n g :

support means adapted t o be a f f i x e d t o one of s a i d

e l e m e n t s ;a n c h o r m e a n s a l i g n e d s u b s t a n t i a l l y c o a x i a l l y r e l a t i v e

t o s a i d s u p p o r t means and a d a p t e d t o be af?xed t o

t h e o t h e r o f s a i d e l e m e n t s ;

r e s i l i e n t means f o r connecting s a i d s u p p o r t means t o

s a i d anchor means f o r m o v e m e n t r e l a t i v e t o each

o t h e r i n r e s p o n s e t o r e l a t i v e m o v e m e n t between

s a i d two e l e m e n t s and f o r f o r m i n g a s u b s t a n t i a l l y

s e a l e d chamber f o r r e t a i n i n g a s u b s t a n t i a l l y incom

p r e s s i b l e ? u i d ;

means f o r d i v i d i n g s a i d c h a mbe r i n t o t w o s e c t i o n s o fv a r i a b l e and complementary volumes and f o r

y i e l d i n g t o p r e d e t e r m i n e d d i f f e r e n c e s i n p r e s s u r e i nt h e ?uid i n s a i d t w o s e c t i o n s a s a r e s u l t of r e l a t i v e

m o v e m e n t between s a i d support means and s a i d

anchor means;

t h r o t t l e means o f s u b s t a n t i a l l y c o n s t a n t c a p a c i t y f o r

p r o v i d i n g a l i m i t e d e x c h a n g e o f ? u i d b e t w e e n s a i d

s e c t i o n i n r e s p o n s e t o r e l a t i v e m o v e m e n t between

s a i d s u p p o r t means and s a i d anchor means;

means f o r l i m i t i n g t h e y i e l d i n g o f s a i d d i v i d i n g means

i n response t o r e l a t i v e m o v e m e n t a t a t l e a s t s a i d

h i g h a m p l i t u d e b e t w e e n s a i d two e l e m e n t s ; a n d

means f o r s e l e c t i v e l y b y p a s s i n g s a i d t h r o t t l e means a t

l e a s t a t r e l a t i v e m o v e m e n t between s a i d t w o e l e

m e n t s o f a t l e a s t s a i d h i g h a m p l i t u d e t h e r e b y p r o

v i d i n g a s u b s t a n t i a l l y u n i m p e d e d e x c h a n g e o f f l u i dbetween s a i d t w o s e c t i o n s and p r o v i d i n g m o v e

ment between s a i d s u p p o r t means and s a i d anchor

m e a n s a s a function o f s a i d r e s i l i e n t m e a n s .

2 0

2 5

45

5 5

6 5

1 22 . Th e a p p a r a t u s o f c l a i m 1 , wherein one o f s a i d two

e l e m e n t s i s a n i n t e r n a l combustion e n g i n e and wherein

t h e o t h e r of s a i d t w o elements i s t h e c h a s s i s of an a u t o

motive v e h i c l e .

3 . The a p p a r a t u s o f c l a i m 2 , w h e r e i n s a i d t h r o t t l e

b y p a s s i n g means c o m p r i s e s a s e l e c t i v e l y o p e n a b l e v a l v e

means.

4 . The a p a r a t u s o f c l a i m 3 , wherein s a i d v a l v e means

i s c o n t r o l l e d by means r e s p o n s i v e t o m o v e m e n t o f s a i d

i n t e r n a l c o m b u s t i o n e n g i n e .

5 . The a p p a r a t u s o f c l a i m 2 , w h e r e i n s a i d t h r o t t l e

b y p a s s i n g means c o m p r i s e s a ? u i d - ? l l e d ca p s u l e s u b

me rg e d i n s a i d ? u i d i n one o f s a i d t w o s e c t i o n s and

s e l e c t i v e l y c o n n e c t i b l e t o means f o r c o n t r o l l i n g t h e

p r e s s u r e o f s a i d ? u i d w i t h i n s a i d c a p s u l e .

6 . The a p p a r a t u s o f c l a im 2 , w h e r e i n s a i d t h r o t t l e

means c o m p r i s e s a t l e a s t one p e r f o r a t i o n i n s a i d y i e l d

able m e a n s .

7 . An a p p a r a t u s f o r s e l e c t i v e l y a b s o r b i n g r e l a t i v emovement o f h i gh a m p l i t u d e a n d l o w f r e q u e n c y b e

tween a n i n t e r n a l combustion e n g i n e and t h e f r a m e o f

a n a u t o m o t i v e v e h i c l e , c o m p r i s i n g :

? r s t an d second m e a n s m ou n t e d f o r m o v e m e n t r e l a

t i v e t o e a c h o t h e r a l o n g a p r e d e t e r m i n e d a x i s and

a d a p t e d t o b e c o n n e c t e d t o s a i d e n g i n e a n d s a i d

f r a m e , r e s p e c t i v e l y ;means f o r e s t a b l i s h i n g a c o n n e c t i o n o f a ? r s t d e g r e e

o f r e s i l i e n c y between s a i d ? r s t and s e c o n d means

a n d f o r t h e f o r m i n g a s u b s t a n t i a l l y s e a l e d chamber

between s a i d ? r s t and second means f o r r e t a i n i n g a

s u b s t a n t i a l l y i n c o m p r e s s i b l e ? u i d i n s a i d c h a m b e r ,

s a i d f l u i d i m p a r t i n g t o s a i d c o n n e c t i o n a second

d e g r e e o f r e s i l i e n c y l e s s t h a n s a i d ? r s t d e g r e e ;

means y i e l d i n g i n r e s p o n s e t o d i f f e r e n c e s i n p r e s s u r e

i n s a i d ?uid i n s a i d t w o s e c t i o n s i n r e s p o n s e t o

r e l a t i v e mov e me n t between s a i d ? r s t and second

means and f o r d i v i d i n g s a i d c h a mbe r i n t o t w o s e c »

t i o n s o f v a r i a b l e a n d c o m p l e m e n t a r y v o l u m e s ;

t h r o t t l e means f o r p r o v i d i n g a l i m i t e d exchange o f

? u i d between s a i d two s e c t i o n s i n r e s p o n s e t o d i f

f e r e n c e s i n p r e s s u r e i n s a i d f l u i d i n s a i d t w o s e c

t i o n s a s a r e s u l t of r e l a t i v e m o v e m e n t between s a i d

? r s t and second m e a n s ;

means f o r l i m i t i n g t h e y i e l d i n g o f s a i d d i v i d i n g means

a s a f u n c t i o n o f a m p l i t u d e and f r e q u e n c y o f s a i d

r e l a t i v e movement;means f o r s e l e c t i v e l y b y p a s s i n g s a i d t h r o t t l e means n

response t o r e l a t i v e m o v e m e n t between s a i d ? r s t

and second m e a n s a t an amplitude not l e s s than s a i d

h i g h a m p l i t u d e f o r p r o v i d i n g a n u n i m p e d e d e x

change o f s a i d ? u i d between s a i d two s e c t i o n s f o r

i n c r e a s i n g t h e r e s i l i e n c y o f s a i d c o n n e c t i o n t o s u b

s t a n t i a l l y s a i d ? r s t d e g r e e o f r e s i l i e n c y .i i t i t

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