Coupling that connects or disconnects driving and driven parts of a driving mechanism.

Often used when many starts and stops are required.

Bearing Gap

Space between the release bearing and the clutch brake.

Clutch Brake Squeeze

Distance the pedal moves as the load is applied to the clutch brake.

Clutch Lever Ratio

An internal ratio for the clutch of the clamp load applied to the driven discs, divided by the maximum load at the release bearing required to release the clutch.

Clutch Torque

The clutch torque rating, normally calculated as a static condition.

Free Pedal Travel

Pedal travel as the release fork tips travel through the yoke gap.

Friction Clutch

A clutch that uses paired friction surfaces on the input and output shaft to transmit the torque.

Hydraulically-Assisted Clutch

A clutch operated by hydraulic pressure.

Pedal Stroke

Full movement of the pedal, from the top of the stroke to, and including, the clutch, transmission, driveline, axle and tires.

Release Bearing Travel

Distance the release bearing moves during the release of the clutch.

Release Pedal Travel

Distance the pedal moves during release bearing travel.

Slip the Clutch

To operate the clutch so that it partially disengages, as when keeping up the revs when driving off; causes wear on the clutch.

Soft-Damped Clutch

Assemblies using soft-rate damped driven disc assemblies.

Take Up

To begin to transmit the drive when the clutch is engaged.

Wet Clutch

A clutch immersed in a cooling lubricating fluid, which also keeps the surfaces clean and gives smoother performance and longer life.

Yoke Gap

Space between the yoke fingers and the clutch release bearing.

See also: Cone Clutch, Disc Clutch, Friction Clutch, Gearbox, Multiple Disc Clutch, Snatch, Wet Clutch.

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Subjects: Automotive Mechanical Engineering

OGURA Industrial Corp Manufacturer of clutches, some great pages describing different types and how they work.