Correct maintenance car universal joint cross shaft needle roller bearing

Drive shaft universal joint cross shaft needle bearing should use smooth gear oil. But common found in vehicle maintenance and repair, the drive shaft universal joint cross shaft needle roller bearing are using smooth calcium base grease ( Commonly known as butter) To smooth, smooth practice this way is wrong, attracted a large number of cross shaft early damage of needle bearing. In disassembly can clearly see that the cross shaft journal presents the squeezed middle pressure groove, journal and needle in seriously short of oil. Why will appear this kind of phenomenon? Is due to the universal joint cross shaft smooth nozzle of needle roller bearing is a common grease nipple, so give people an illusion, universal filling butter to smooth for a long time. In fact, from the nozzle with grease gun is difficult to mix the butter filling on the needle roller bearing. It is well known that the viscosity of the butter, when using grease gun from the nozzle to the universal joint cross shaft needle roller bearing inner cavity loaded with butter, butter into the oil duct stenosis lumen resistance increase, butter across the open pressure nozzle pressure reducing valve and overflow. This phenomenon will be the driver and repair personnel mistake once filled with butter. But practice basic did not enter the needle between butter, is to reach the axle shaft end face is also very difficult. When remove the maintenance, even using force to apply butter in the needle roller and shaft neck appearance also can have some smooth effect, but the smooth effect of needle bearing the cross shaft, smooth calcium base grease is much less than the gear oil well, the reason is: a. In universal joint work to accept large torsion and alternating load, and smooth calcium base grease oil film strength level is poorer, friction in the bearing and shaft neck appearance is difficult to form a good oil film. b。 Universal joint cross shaft turn needle roller bearing in the work can only be in situ, not along the steel bowl and cross axis neck rotation, and calcium base grease smooth roll is very poor, so when the oil film was destroyed after not immediately constitute a new film. c。 Smooth calcium base grease is a mixture of calcium soap and lubricating oil, oil in use due to the smooth transformation and evaporation, the grease into a hard calcium soap and calcium soap itself not only cannot have smooth effect, but also the obstacles to the needle on the journal of rolling, with universal joint cross shaft and there is no discharge of oil measures, changed smooth fat cannot eduction, new oil and it is difficult to injection, thus greatly accelerate the universal joint cross shaft needle roller bearing wear. In order to change this butter substitute gear oil to smooth the erroneous practice of universal joint cross shaft needle roller bearing, the initiative to adopt the following measures for maintenance to advance the use of universal joint cross shaft needle roller bearing life. 一个。 Remove the universal joint cross shaft stop thoroughly clean after needle roller bearing, the remaining smooth fat all clear ( Available water or in gasoline cleaning) After soaking in the gear oil 2 min ~ l0min, can use. Should pay attention to in using: auto wading after driving should be timely to change the new oil. Travel 2000 km to 3500 km should change a new oil. This method by experiment, can make the universal joint cross shaft needle roller bearing longevity 2 ~ 3 times.