Download - Clutch
K. J. Somaiya College of Engineering, Mumbai-77
(Autonomous College Affiliated to University of Mumbai)
Study Report on Clutch used in
Mahindra Scorpio CRDE
The clutch is intended for general starting of the automobile from rest,
disconnecting the engine from the transmission in order to shift gears, and
for avoiding the effect of large dynamic loads on the transmission which appear in
transient conditions and on moving on
different types of roads.
The type of clutch in the car is:
Single plate clutch is of dry type.
Hydraulic Actuation. Weight of the clutch: 5kg
Lubricants and capacities:
Lubricant: MAHINDRA “MAXIMILE DOT
4”
Capacity: 0.9 liters
Remarks: In emergency situations, brake fluid meeting SAE J1703; FMVSS No.116 DOT 4 or IS 8654 Type-2 specification and change at 30,000 km or 2 years whichever earlier.
Single-disc dry clutches
are simple in making and
servicing; they are reliable
and noted for sufficiently
good disengagement and
ensure effective heat
removal from friction pairs.
They have small mass and
high wear resistance.
About 65% of the clutch
plate area is faced on both
sides with friction material.
For consideration, a typical passenger car clutch plate area with a 10 inch diameter
would have a band of friction material of 4in wide along its outer portion.
Wet clutches tend to have multiple plates and they run in oil whereas Dry
clutches tend to be bigger in diameter and have one plate and run in air. There isn’t
much difference in their performance. Mostly the wet clutch is used in bikes. Other
than that, the weight is the issue. The dry clutch tends to be of lighter weight as it
is mostly equipped with single plate clutch.
Especially bikes like Ducati and BMW are still using Single Plate Dry Clutch
because of less weight, more efficiency, less leakages. So their performance on the
racetrack is better.
Now, what is actually hydraulic actuation system for clutch?
On models with hydraulic clutch activator, the system reservoir should be kept
filled with the oil to the correct level. The only lubricated part of this type of clutch
is “throw-out bearing”.The Clutch operation is accomplished either mechanically
or with a hydraulic pressure system.
If a vehicle has a mechanically operated linkage, it will incorporate either a shaft-
and-lever linkage arrangement or a cable.
On a hydraulically operated clutch, a master cylinder is usually directly operated
by the clutch pedal assembly. A slave cylinder at the transmission is connected to
the master cylinder by high-pressure tubing. The slave cylinder pushes either an
operating lever or directly on the release bearing.
Advantages of hydraulic actuation system:
Hydraulic systems require less pedal pressure and provide a smooth “liquid”
feel to clutch engagement.
Design configuration is very flexible and can very easily be adapted to most
any required configuration.
References:
[1] Mahindra_scorpio_owner_manual.
[2] Single plate clutch assembly (https://grabcad.com/library/single-plate-clutch-11)
[3] Clutch plates (http://www.motrpart.in/d/581/mahindra-mahindra-ltd-/clutch-plate)
[4] Specifications of clutch plates (http://www.amazon.in/Valeo-404589-Clutch-Mahindra-
Scorpio/dp/B00PTN6JQ2/ref=sr_1_19?s=automotive&ie=UTF8&qid=1437401579&sr=1-
19&keywords=clutch+plate)
[5] http://www.motoringassist.com/motoring-advice/car-maintenance/engine-and-transmission/guide-
clutch-faults-part-2/
[6] https://answers.yahoo.com/question/index?qid=20130420151318AAmGL9c
[7] Don M. Pirro, Ekkehard Daschner, Book on lubrication Fundamentals
(https://books.google.co.in/books?id=CgsHANZuz-
4C&pg=PA384&lpg=PA384&dq=why+is+lubrication+required+in+dry+single+plate+clutch&source=bl&ots=
b7YPmL-
AaU&sig=OCN8SS5PE_o_chgcEIH24Dgthc4&hl=en&sa=X&ved=0CCMQ6AEwAWoVChMIs9mb0fX3xgIVxRi
OCh34Qg_Y#v=onepage&q=why%20is%20lubrication%20required%20in%20dry%20single%20plate%20clu
tch&f=false)