Clutch play

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As a clutch play is called the distance between release bearing and release ring or diaphragm.

Clutch actuation with play

As a result of the lining wear, the clutch pressure plate shifts in the direction of the flywheel . The diaphragm spring , which acts as a lever, reverses this direction of movement when the clutch is pressed and pushes the tongues of the diaphragm spring closer to the releaser. This makes the game smaller. It must be readjusted in good time, as the play disappears completely as the lining wears, and the diaphragm spring tongues would then run into the releaser.

The contact pressure of the diaphragm spring could then no longer have its full effect, and the clutch would slip. The resulting frictional heat would cause burns on the clutch linings. In addition, the heat could be transferred via the clutch pressure plate to the diaphragm spring, which would then burn out and lose its tension.

Overheating can cause the flywheel to tarnish and warp.

There is a clearance of about 1 mm to 3 mm between the tongues of the diaphragm spring and the face of the releaser. The play is necessary so that the clutch does not slip after a certain lining wear when the clutch is engaged.

The play on the clutch pedal should usually (car area) be 10 mm to 30 mm. The setting is made either on the release lever or on the clutch pedal by turning an adjusting nut.

Clutch actuation without play

The clutch actuation adjusts itself automatically without play depending on the wear condition of the lining. In the mechanical clutch operation is automatic adjustment with increasing lining wear the releaser without play after.

Mode of action

When the lining is worn, the play piece on the release lever becomes longer. If the pedal goes into the rest position after decoupling, the ball cage is moved downwards by the clamping piece and the locking cone is released. The cable casing is pulled into the adjustment device and tensioned tighter, the play on the releaser is balanced.

In the case of hydraulic clutch actuation without a fixed stop, the diaphragm spring clutch must be equipped with a special, centrally guided releaser, the release bearing of which runs continuously, for the slave cylinder to be in the rest position.

The releaser presses the tongues of the diaphragm spring with a low preload force of around 40 N to 100 N. The preload force is generated by a spring in the slave cylinder and passed on to the push rod via the piston.

literature

  • Hans Jörg Leyhausen: The master craftsman's examination in the automotive trade part 1. 12 edition, Vogel Buchverlag, Würzburg, 1991, ISBN 3-8023-0857-3
  • Hans-Hermann Braess, Ulrich Seiffert: Vieweg manual automotive technology. 2nd edition, Friedrich Vieweg & Sohn Verlagsgesellschaft mbH, Braunschweig / Wiesbaden, 2001, ISBN 3-528-13114-4