CLUTCH

 

A clutch in machine elements connects and disconnects power transmission. The clutch engages/disengages the power transmission between the engine and gearbox. It allows gear shifts in manual transmissions.


 Clutch and Gearbox work together, but perform different jobs 

- Clutch: connects/disconnects the engine from the gearbox (like an on/off switch)

- Gearbox: changes gear ratios for speed/torque adjustments (like a speed controller).


Type of clutch 

1. Friction clutches: 

- Engage/disengage via friction. Friction clutches include 

- Single plate clutch: common in cars 

- Multi-plate clutch: more torque, used in heavy vehicles/bikes 

- Cone clutch: older tech, less common

- Wet clutch: oil-cooled (e.g., some bikes)

- Dry clutch: no oil (e.g., most cars)


2. Dog clutches: 

- Engage/disengage via mechanical "jaws" or "teeth"

- No slipping, direct power transfer

- Used in: Manual transmissions (some), Racing cars, Industrial machinery


3. Electromagnetic clutch:

- Engages/disengages via electric current

- No mechanical linkage needed

- Used in: Air conditioning compressors, Industrial machinery, Electric vehicles (some)


4. Centrifugal clutch: 

- Engages automatically with speed (RPM)

- No manual control needed

- Used in: Scooters, Small engines (e.g., lawnmowers), Some industrial equipment



5. Safety clutch:

- Protects machinery from overload or damage

- Disengages when torque exceeds the set limit

- Used in: Industrial equipment, Conveyor belts, Machine tools


6. Diaphragm clutch:

- Uses a spring diaphragm for pressure

- Common in modern cars 

- Advantages: Compact design, Smooth engagement, Less prone to wear


7. Overrunning clutch:

- Allows one shaft to turn faster than another

- Prevents backdrive (e.g., engine braking in starters)

- Used in: Starter motors, Conveyors, Agricultural equipment


8. Hydraulic clutch:

- Uses fluid pressure to engage/disengage

- Common in vehicles 

- Advantages: Smooth operation, Less effort needed, Easy to install


Hydraulic clutch system:

- Clutch pedal → Master cylinder → Hydraulic line → Slave cylinder → Clutch release bearing

- Fluid pressure disengages the clutch 


Clutch system components:

- Clutch pedal: driver input

- Master cylinder: converts pedal pressure to hydraulic pressure

- Slave cylinder: applies pressure to the clutch release mechanism

- Clutch release bearing: disengages the clutch

- Clutch disc and pressure plate: transmit or disconnect power.



Note 7

Title; clutch 

Part 1; Machine elements 

Collection; The art of doing science and engineering 

Put together by; Mustapha Cisse 

Presented by; Amabros Technical Company.

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