How to protect universal joint cross shaft bearings

Source: Bearing network time: 2017-10-23

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The universal joint cross shaft bearing of the drive shaft should be smooth with the gear oil. But it is usually found in the repair; the universal joint cross shaft needle bearing of the drive shaft is smoothed with calcium-based smooth grease (commonly known as butter); practice this smooth The method is faulty; it has caused the early damage of a large number of cross-shaft needle bearings. In the disassembly, it can be clearly seen that the cross-shaft journal presents a groove that is squeezed and pressed; the journal and the needle are severely short of oil.
Why is this representation present?
It is because the smooth nozzle of the universal joint cross-shaft needle bearing is a general grease nozzle; so it creates an illusion for everyone; it has been smoothed with butter for a long time.
In fact, it is very difficult to fill the butter onto the needle bearing from the grease gun at the nozzle. It is well known that the viscosity of the butter is large; when using a grease gun, the grease from the nozzle to the universal shaft of the cross shaft needle bearing is added. When the butter is injected, the resistance increases when the butter enters the narrow inner oil passage; the pressure of the butter rises and overflows with the pressure reducing valve opposite the nozzle. This appearance is also mistaken by the driver and the repairman for being filled with butter.
In practice, the butter does not enter the needle between the needles; it is very difficult to reach the end of the cross shaft journal. When removing the repair; that is, using the forced method to change the butter on the needle and the journal surface can also play some Smooth effect; but regarding the smoothing effect of the cross-shaft needle bearing; calcium-based smooth grease is far less good than gear oil; the reason is:
a. The universal joints are subject to great torque and alternating load during work; the oil film of calcium-based smooth grease is tough; the conflict between the bearing and the journal is difficult to form an outstanding oil film.
b. The needle roller bearing of the universal joint cross shaft can only be changed in situ during work; it cannot rotate along the steel bowl and the cross journal; while the calcium-based smooth grease has poor tumbling property; therefore, when the oil film is damaged, it cannot immediately constitute a new one. Oil film.
c. Calcium-based smooth fat is a mixture of oil and calcium soap; it is used in the application because of the smoothing and transpiration of smooth oil; the grease becomes a harder calcium soap; the calcium soap itself can not only achieve a smooth effect; It also prevents the rolling pin from rolling on the journal; plus there is no oil draining method in the universal joint cross shaft; the smoothed grease can not be discharged; the new oil is difficult to write; therefore, the universal direction is greatly accelerated Wear of the cross-shaft needle bearing.
In order to be able to modify the faulty method of replacing the gear oil with butter to smooth the universal joint cross-shaft needle bearing; the following protection methods are recommended; to improve the service life of the universal joint cross-shaft needle bearing.
a. After removing the universal joint cross-shaft needle bearing, completely remove it; remove all remaining smooth grease (can be boiled or put into gasoline), soak it in gear oil for 2min - l0min; The application should pay attention to: the new oil should be replaced in time after the car wading. The new oil should be replaced by 2000km-3500km. This method can be tested; the life of the universal joint cross-shaft needle bearing can be extended by 2 times-3 Times.
b. It can be equipped with special hydraulic filling equipment; the timing of the universal joint cross shaft needle bearing of the transmission shaft is smooth.

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