Reason for damage to the clutch release bearing
1.The working condition of the clutch release bearing and the force of the split bearing are affected by the axial load, the impact load and the radial centrifugal force during high-speed rotation. In addition, since the fork thrust and the reaction force of the separating lever are not in the same line On the top, a torsional moment is also formed. Clutch release bearings have poor operating conditions, intermittent high-speed rotation and high-speed friction, high temperature, poor lubrication conditions, and no cooling conditions. 2. Causes of damage to the clutch release bearing The damage of the clutch release bearing has a lot to do with the drivers operation, maintenance and adjustment. The causes of the damage are as follows: 1) The operating temperature is too high and the overheating is caused by many drivers turning or slowing down. At times, the clutch is often stepped on halfway, and some of the gears are placed on the clutch pedal; some vehicles have too large free travel adjustment, so that the clutch is not completely separated, and is in a semi-engaged and semi-detached state, which causes dry friction and generates a large amount of Heat is transferred to the separation bearing, the bearing is heated to a certain temperature, and the butter melts or dilutes the flow, so that the temperature of the separation bearing is further increased, and when the temperature reaches a certain level, it burns out. 2) Lack of lubricating oil and wear The clutch release bearing is lubricated with butter. There are two ways to add the butter. For the 360111 release bearing, the rear cover of the bearing should be opened and filled with grease during maintenance or when the transmission is removed. Then, the back cover can be reassembled; for the 788611K release bearing, it can be removed and placed in molten grease for dip, cooled and taken out to achieve the purpose of lubrication. In actual work, the driver easily overlooks this, resulting in a lack of oil in the clutch release bearing. The amount of wear of the separated bearing in the case of no lubrication or less lubrication is often several to several tens of times the amount of wear after lubrication. As the wear increases, the temperature will also increase greatly, which makes it more vulnerable. 3) The free travel is too small or the load is too many. According to the requirements, the clearance between the clutch release bearing and the release lever is 2.5mm. The free travel on the clutch pedal is 30-40mm, and the free travel is too small. Or no free travel at all, the separation lever and the release bearing will be in a normally engaged state. According to the fatigue failure principle, the longer the working time of the bearing, the more serious the damage; the more the number of loads, the more likely the separation bearing is to cause fatigue damage. Moreover, the longer the working time, the higher the temperature of the bearing, and the easier it is to burn, reducing the service life of the separation bearing. 4) In addition to the above three reasons, whether the separation lever is adjusted flat, whether the separation bearing return spring is good or not, has a great influence on the damage of the separation bearing.
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