Clutch release bearing, known as ‘clutch throwout bearing’ , is a key component in the manual transmission system of an automobile. It is usually installed between the clutch and the transmission, specifically on the tubular extension of the transmission's first shaft bearing cover, or behind the clutch pressure plate. The main function of this bearing is to ensure that the clutch engages and disengages smoothly, resulting in a smooth gearshift operation.

When the driver depresses the clutch pedal, the clutch master cylinder generates hydraulic pressure, and this pressure is transferred to the clutch slave cylinder, which in turn activates the clutch release bearing. The bearing will move towards the diaphragm spring, compressing the contact between the pressure plate and the clutch disc, thus disengaging the clutch. In this way, engine power is disconnected from the transmission, allowing the driver to perform a gearshift.

The design of the clutch release bearing allows the release lever to rotate while moving axially along the clutch output. This design ensures that the clutch engages smoothly and disengages gently, reducing wear and tear on the clutch and its driveline and extending service life.

Overall, the clutch release bearing is an indispensable part of the manual transmission system, and its proper functioning is essential for smooth gearshift operation and prolonging the service life of the clutch.

How clutch release bearings work:

Clutch release bearings, also known as clutch release thrust bearings, are an integral part of the operation of a vehicle's manual transmission system. Here is a detailed explanation of its working principle:.

1. Connected to the clutch system: The clutch release bearing is located between the clutch fork (or hydraulically actuated slave cylinder) and the pressure plate. It can be connected directly to the fork via a mechanical linkage or indirectly via the hydraulic system.

2. Transmission release: When the driver depresses the clutch pedal, this action pushes the mechanical linkage or pressurises the hydraulic system to move the clutch release bearing forward.

3. Compression Diaphragm Spring: The forward movement of the release bearing exerts force on the central diaphragm spring of the clutch assembly. This spring is part of the clutch cover (pressure plate) and is responsible for pressing the clutch discs together when the clutch is engaged.

4. Separation of clutch discs: As the diaphragm spring is depressed by the release bearing, it releases its pressure on the clutch discs and separates them from the flywheel. This separation breaks the mechanical connection between the rotating crankshaft of the engine and the transmission input shaft, thus enabling gear changes without stalling the engine.

5. Smooth engagement: When the clutch pedal is released, the pressure is relieved and the diaphragm spring returns to its original position, reapplying pressure to the clutch discs and re-establishing power transmission from the engine to the wheels.

6. Rotation and Lubrication: The release bearing itself rotates within its housing as it moves, minimising friction. Proper lubrication of the bearing is necessary to ensure smooth operation and prevent premature wear.

Key components and their roles

Outer ring:The fixed part of the bearing that connects to the clutch release fork.

Inner ring:Rotates with the diaphragm spring.

Rolling elements (balls or rollers): facilitate smooth rotation between the inner and outer rings.

Cage:Holds the rolling elements in place and prevents them from colliding during operation.

Contact surface:The point of contact between the bearing and the fingers of the diaphragm spring.

In summary, the clutch release bearing is a key component in the manual transmission system, operating on the principle of mechanical force and spring action. Its smooth and efficient operation ensures smooth shifting and extended clutch life.

The clutch release bearing, also known as a throwout bearing or clutch release sleeve, plays a vital role in the functioning of a manual transmission system. Its working principle is closely related to the operation of the clutch mechanism, which serves to transfer power from the engine to the transmission. Its proper functioning is critical to the smooth and reliable operation of the clutch system.