KINEMATICS OF MACHINES

GOVERNMENT ENGINEERING COLLEGE -

BHUJ

• STUDENT NAME:- PARMAR UMANG R.• SUDENT ENROLLMENT NO.:-130150119076

Let, r1= Radius of larger pulley r2= Radius of smaller pulley x = Center distance between two

pulleys (i.e. O1 O2)

ANGLE OF CONTACT OR ANGLE OF LAP

In open belt drive, belt will begin to slip on smaller pulley, because angle of lap ( ) is smaller on this pulley compared to larger pulley.

The angle should be taken as minimum angle of contact.

Hence angle of lap or angle of contact ( ) at smaller pulley must be taken into consideration.

(a) For Open belt drive

(a) For Open belt drive

Angle of contact,

(a) For Open belt drive

)( ,

180)2180(

)2180(

211

x

rrSinwhere

radians

For cross belt drive angle of contact or lap is same on both the pulleys.

(b) For Cross belt drive

Angle of contact,

(b) For Cross belt drive

)( ,

180

)2180(

)2180(

211

x

rrSinwhere

radians

Thank you…