a car clutch for dummies
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A CAR CLUTCH
for dummies
Thijs Leroy | 23 dec 2010 | HOWEST Kortrijk | Constructieleer
Thijs Leroy23 dec 2010Constructieleer
Definition
A CAR CLUTCHFor dummies
02/19
A clutch =
o A mechanical device which provide for the transmission of power (motion) from one component to another (wikipedia)
o A coupling that connects or disconnects driving (motor) and driven (wheels) parts of a driving mechanism
Thijs Leroy23 dec 2010Constructieleer
Definition
A CAR CLUTCHFor dummies
03/19
A clutch =
o Rigid connection (if connected)
o Dry clutch: contactareas are dry
Thijs Leroy23 dec 2010Constructieleer
Operation
A CAR CLUTCHFor dummies
04/19
Basic Principle
Thijs Leroy23 dec 2010Constructieleer
Parts
A CAR CLUTCHFor dummies
05/19
Assembly
o simplified
Thijs Leroy23 dec 2010Constructieleer
Parts
A CAR CLUTCHFor dummies
06/19
Assembly
o Real life
Thijs Leroy23 dec 2010Constructieleer
Parts
A CAR CLUTCHFor dummies
07/19
Flywheel
o Function• Starts and keeps motor spinning• Large spinning contactarea• Placement of other components
o Essential• mass• Large contactarea
o Connection• Rigid with crankshaft
Thijs Leroy23 dec 2010Constructieleer
Parts
A CAR CLUTCHFor dummies
08/19
Flywheel
Thijs Leroy23 dec 2010Constructieleer
Parts
A CAR CLUTCHFor dummies
09/19
Clutch Plate
o Function• transmit power from flywheel to gearbox input shaft• Do nothing
o Essential• Friction material• Chock absorption• Wear resistance
o Connection• Radial fixed with gearbox input shaft: splined shaft
• If connected: rigid with flywheel and pressure plate by friction
Thijs Leroy23 dec 2010Constructieleer
Parts
A CAR CLUTCHFor dummies
10/19
Clutch Plate
still no transmitting of power
Thijs Leroy23 dec 2010Constructieleer
Parts
A CAR CLUTCHFor dummies
11/19
Pressure Group
o Funtion• Squeeze clutch plate between 2 spinning areas
o Essential• Large contactarea• Delivre/release pressure
o Parts• Housing• Pressure plate• Diaphragm spring
o Connection• Housing rigid with flywheel result: speed pressure group = speed flywheel = speed motor
Thijs Leroy23 dec 2010Constructieleer
Parts
A CAR CLUTCHFor dummies
12/19
Pressure Group – Diaphragm spring
o Funtion• Push pressure plate to clutch plate
o Essential• Strong and reliable• Delivre/release pressure
o Connection• Radial fixed with housing by studs
• Rigid with pressure plate
Thijs Leroy23 dec 2010Constructieleer
Parts
A CAR CLUTCHFor dummies
13/19
Pressure Group – Diaphragm spring
o Operation• Beam
• Live demonstration
• Why doesn’t push the clutch plate the spring back?
Thijs Leroy23 dec 2010Constructieleer
Parts
A CAR CLUTCHFor dummies
14/19
Pressure Group
How to control the diaphragm spring?
Thijs Leroy23 dec 2010Constructieleer
Parts
A CAR CLUTCHFor dummies
15/19
Release fork and bearing
o Function• Connection between pedal and clutch• Lever
o Essential• Strong• No friction between fork and spring: bearing
o Connection• Hinge between clutch housing and fork• Hydraulical or mecanical with clutchpedal
Thijs Leroy23 dec 2010Constructieleer
Parts
A CAR CLUTCHFor dummies
16/19
Assembly
o simplified
Thijs Leroy23 dec 2010Constructieleer
Specification
A CAR CLUTCHFor dummies
17/19
Depends on… the car
Torque…
Thijs Leroy23 dec 2010Constructieleer
Optimization
A CAR CLUTCHFor dummies
18/19
o 1 big problem!
Oil will destroy your clutch due to:• friction (difference in speed)• Heat
o Positioning the different parts
o Optimization of the clutch plate
o mass
Thijs Leroy23 dec 2010Constructieleer
Conclusion
A CAR CLUTCHFor dummies
19/19
It’s a well thought product. It has proven his utility.
Difficult to optimize, the principle is already used for decades.What do they do now: flywheel and clutch plate optimization.
The future?Does an electric car use a clutch?
THANK YOU
Thijs Leroythijs.leroy@howest.be
Constructieleer – R. VersluysHOWEST Kortrijk
2010 - 2011
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