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What is the Cause of the Damage to the Release Bearing?

Jun. 24, 2021

As an Automotive Bearing Supplier, share with you.

Working conditions

Release bearing

During use, it is affected by axial load, impact load, and radial centrifugal force during high-speed rotation. In addition, because the fork thrust and the reaction force of the separating lever are not in the same straight line, a torsional moment is also formed. The clutch release bearing has poor working conditions, intermittently rotating at high speed and bearing high-speed friction, high temperature, poor lubrication conditions, and no cooling conditions.

Clutch Release Bearings

Clutch Release Bearings

Cause of damage

The damage of the clutch release bearing has a lot to do with the operation, maintenance and adjustment of the driver. The reasons for the damage are roughly as follows:

1) The working temperature is too high to cause overheating

Many drivers often half-depress the clutch when turning or decelerating, and some have their feet on the clutch pedal after shifting; some vehicles have too much adjustment of the free stroke, which makes the clutch disengagement incomplete and in a semi-engaged and semi-disengaged state. A large amount of heat generated by dry friction is transferred to the release bearing. The bearing is heated to a certain temperature, and the butter melts or dilutes and flows, which further increases the temperature of the release bearing. When the temperature reaches a certain level, it will burn out.

2) Lack of lubricating oil and wear

The clutch release bearing is lubricated with grease. There are two ways to add grease. For the 360111 release bearing, open the back cover of the bearing and fill in the grease during maintenance or when the transmission is removed, and then reinstall the back cover. Just close; for the 788611K release bearing, it can be disassembled and immersed in molten grease, and then taken out after cooling to achieve the purpose of lubrication. In actual work, the driver tends to ignore this point, causing the clutch release bearing to run out of oil. In the case of no lubrication or less lubrication, the amount of wear of the release bearing is often several to several tens of times the amount of wear after lubrication. As the wear increases, the temperature will also be greatly increased, so that it is more vulnerable to damage.

3) The free stroke is too small or the number of loads is too much

According to the requirements, the clearance between the clutch release bearing and the release lever is 2.5mm. The free stroke reflected on the clutch pedal is 30-40mm. If the free stroke is too small or there is no free stroke at all, it will cause the separation lever to interact with each other. The release bearing is in a normally engaged state. According to the principle of fatigue failure, the longer the working time of the bearing, the more serious the damage; the more times the bearing is loaded, the easier it is for the release bearing to produce fatigue damage. Moreover, the longer the working time, the higher the temperature of the bearing, the easier it is to burn, which reduces the service life of the release bearing.

4) In addition to the above three reasons, whether the separation lever is adjusted smoothly, and whether the return spring of the separation bearing is good, also has a great influence on the damage of the separation bearing.

Our company also has Clutch Release Bearings on sale, welcome to contact us.

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