Clutch release bearing is a more important part of vehicle. If it fails to maintain well, it will not only cause economic losses, but also a lot of work time. Therefore, it is important for us to find out the cause of the failure of the clutch bearing and to maintain and maintain it reasonably, which is important for prolonging the life of the separated bearing, improving the labor productivity and obtaining better economic benefits.
One, the function of the separation bearing of the clutch
Clutch bearings installed in the clutch in the transmission between the separation bearing sleeve on the transmission shaft cover the first tubular extended portion, through a return spring to shoulder separation bearing has always withstood the separation fork, and returned to the last position, maintain a gap of about 2.5mm and separation lever.
Since the clutch plate, the release lever and the engine crankshaft synchronous operation, and the separation fork only along the axial movement of the output shaft of the clutch release fork, directly used to dial the release lever is clearly not enough, can be separated by separating the bearing lever rotates along the clutch output shaft axial movement, thus ensuring the clutch can smooth engagement, separation and soft, reduce wear and prolong the clutch and the transmission of life.
Two. Requirements for clutch separation bearing
The clutch bearing should move flexibly, without sharp noise or jamming. The axial clearance should not exceed 0.60mm, and the wear of the inner race shall not exceed 0.30mm.
Three. Fault diagnosis and inspection of the damage of the separation bearing
If the separation bearing of the quotient can not reach the above requirements, it is considered to be a failure. After the failure, first of all to judge which phenomenon belongs to the separation of the bearing damage. When the engine starts to step on the clutch pedal, when the free stroke has just been eliminated, the sound of "sand sand" is the separation of the bearing.
When checking, the bottom cover of the clutch can be removed, and a little acceleration pedal is stepped on, and the engine speed is slightly improved. If the noise increases, Mars can be observed. If there is a Mars, it indicates that the clutch separation bearing is damaged. If the Mars is a strands of strands, it shows that the ball of the separation bearing is broken. If there is no Mars, there is a metal breaking sound, indicating excessive wear.
Four, the cause of the failure of the clutch bearing
Working conditions and force of 1. clutch separation bearing
The separated bearing is subjected to axial load, impact load and radial centrifugal force when it is used. In addition, because the reaction force of the fork thrust and the separating lever is not on the same straight line, the torsional moment is also formed. The working conditions of the clutch separation bearing are poor, with high speed and high speed friction, the temperature is high, the lubrication condition is poor, and there is no cooling condition.
Cause of 2. clutch separation bearing damage
The damage of the clutch bearing is closely related to the operation, maintenance and adjustment of the driver, and the causes of the damage are generally as follows:
1) overheating of working temperature
Many drivers in turn or deceleration, often half foot clutch, some gear foot on the clutch pedal free travel vehicle; some adjustment is too large, the clutch is not complete, in the semi joint semi detached, the transfer of state caused by dry friction and produce large quantity of heat to the separation of bearings, bearing fever to a certain temperature, melt the butter or dilute flow, so that the separation of bearing temperature is further increased, when the temperature reaches a certain level will burn.
2) wear and tear without lubricating oil
Use grease clutch bearings, there are two methods for separation of butter into the 360111 bearing, should be in the maintenance or remove the transmission, the bearing cap filled with grease, and then re arranged to cover; for 788611K separation bearing to said, it can be removed under lubrication the digestion of fat melting, after cooling, can achieve the purpose of lubrication. In the actual work, the driver is easy to ignore this point, which leads to the lack of oil in the clutch separation bearing. In the condition of no lubrication or less lubrication, the wear of the bearing is often several times to several times as much as the amount of wear after the lubrication. The wear and tear increase, the temperature will also be greatly improved, which is more vulnerable to damage.
3) too little free travel or too much load
According to the requirements of the general gap between the clutch bearings and the release lever is suitable for 2.5mm, reflecting on the clutch pedal free travel for 30-40mm, free travel is too small or no freedom of travel, will make the release lever and release bearing is often engaged. According to the principle of fatigue failure, the longer the working time of the bearing, the more serious the damage is, the more the load times, the more easy the separation bearing to produce fatigue damage. And the longer the working time, the higher the temperature of the bearing, the more easy to burn, and reduce the life of the separation bearing.
4) except for the above three reasons, the separation lever adjustment is smooth, the separation bearing spring is good, and it also has a great influence on the damage of the separation bearing.
Five, problems should be paid attention to in use
1) according to the operating regulations, avoid the semi - joint and half separation state of the clutch and reduce the use of the clutch.
2) pay attention to maintenance, regular or in the annual inspection and maintenance, with the cooking method to make it fully saturated with butter, lubricant.
3) pay attention to the adjustment of the clutch separation lever and ensure that the resilience of the back spring is in accordance with the regulations.
4) adjust the free travel, make it meet the requirement (30-40mm), prevent the free travel too much
