Correct lubrication steps of SWC cross shaft universal coupling
Time: 2018-04-15 Browse:
It bears large torque and alternating loads during work. The main damage forms are the wear of the cross shaft journal and needle roller bearing, the indentation and peeling of the working surface of the cross shaft journal and needle bearing bowl.
In the vehicle maintenance specifications, it is stipulated that the sliding fork teeth and intermediate bearings use calcium-based grease (butter); the needle roller bearings of the cross shaft and the intermediate bearings of the three-axle drive vehicle use gear oil.But in actual work, because the grease nipple of the cross shaft is the same as the grease nipple, sometimes it is for easy operation and sometimes there is no filling equipment. Many drivers and maintenance personnel erroneously dare to use grease lubrication on the needle roller of the cross shaft. Cause early damage to the cross shaft.
In the vehicle maintenance specifications, it is stipulated that the sliding fork teeth and intermediate bearings use calcium-based grease (butter); the needle roller bearings of the cross shaft and the intermediate bearings of the three-axle drive vehicle use gear oil.But in actual work, because the grease nipple of the cross shaft is the same as the grease nipple, sometimes it is for easy operation and sometimes there is no filling equipment. Many drivers and maintenance personnel erroneously dare to use grease lubrication on the needle roller of the cross shaft. Cause early damage to the cross shaft.
XNUMX. Why can't adding butter provide lubrication?
XNUMX. Calcium-based grease is composed of thickener calcium and basic lubricating oil, and its structure is relatively dispersed.If the car continues to run under heavy load for a long time, most of the base lubricating oil in the oil film will be separated, and the oil film will basically not exist.Moreover, the fluidity of butter at room temperature is very poor, and the roller needle can only rotate in place during work.Therefore, when the original oil film fails, it is difficult to form a new oil film immediately, causing the needle roller bearing and the cross shaft to be in a semi-dry friction or dry friction state.
2. The lubricating grease becomes harder soap after degeneration and evaporation, which not only can not provide lubrication, but also hinders the rolling of the needle roller; in addition, the joint has no oil drainage device, and the degraded grease can not be discharged. It is inconvenient to inject new grease.During maintenance operations, the injected grease cannot enter the middle of the plastic needle, but is squeezed out from the safety valve. The grease in the bearing is basically still injected for the first time, and it has become degraded soap. Can not get good lubrication.
3. Due to the poor toughness of the butter oil film, while the universal joint has to withstand greater torque and alternating loads during work, it is difficult to form a good oil film in the bearing.
Therefore, grease should not be used to lubricate the universal joint of the cross shaft, but gear oil should be added.
XNUMX. Calcium-based grease is composed of thickener calcium and basic lubricating oil, and its structure is relatively dispersed.If the car continues to run under heavy load for a long time, most of the base lubricating oil in the oil film will be separated, and the oil film will basically not exist.Moreover, the fluidity of butter at room temperature is very poor, and the roller needle can only rotate in place during work.Therefore, when the original oil film fails, it is difficult to form a new oil film immediately, causing the needle roller bearing and the cross shaft to be in a semi-dry friction or dry friction state.
2. The lubricating grease becomes harder soap after degeneration and evaporation, which not only can not provide lubrication, but also hinders the rolling of the needle roller; in addition, the joint has no oil drainage device, and the degraded grease can not be discharged. It is inconvenient to inject new grease.During maintenance operations, the injected grease cannot enter the middle of the plastic needle, but is squeezed out from the safety valve. The grease in the bearing is basically still injected for the first time, and it has become degraded soap. Can not get good lubrication.
3. Due to the poor toughness of the butter oil film, while the universal joint has to withstand greater torque and alternating loads during work, it is difficult to form a good oil film in the bearing.
Therefore, grease should not be used to lubricate the universal joint of the cross shaft, but gear oil should be added.
XNUMX. What are the advantages of gear oil?
1. Gear oil has proper viscosity, and the formed oil film has high strength. The lubricating oil will not be thrown off the contact surface due to centrifugal force and can form good elastic dynamic pressure lubrication.
2. The gear shaft has excellent oiliness and extreme pressure, which can ensure that the boundary lubricant film can be established under high pressure working conditions.
1. Gear oil has proper viscosity, and the formed oil film has high strength. The lubricating oil will not be thrown off the contact surface due to centrifugal force and can form good elastic dynamic pressure lubrication.
2. The gear shaft has excellent oiliness and extreme pressure, which can ensure that the boundary lubricant film can be established under high pressure working conditions.
XNUMX. How to lubricate the cross shaft universal joint?
Due to the poor sealing of the steel bowl and the high fluidity of the gear oil, the gear oil may be gradually thrown out, which will cause semi-dry friction or dry friction, and will also accelerate the wear of the cross shaft and roller needle. Considering the current Actually, if there are gear oil filling equipment, the universal joints should be filled with gear oil to lubricate them regularly. At the same time, pay attention to checking the tightness of the steel bowl; or use lithium-based grease, combined with maintenance operations, to decompose the universal joints. Clean out the old oil and refill with new oil for lubrication.
Due to the poor sealing of the steel bowl and the high fluidity of the gear oil, the gear oil may be gradually thrown out, which will cause semi-dry friction or dry friction, and will also accelerate the wear of the cross shaft and roller needle. Considering the current Actually, if there are gear oil filling equipment, the universal joints should be filled with gear oil to lubricate them regularly. At the same time, pay attention to checking the tightness of the steel bowl; or use lithium-based grease, combined with maintenance operations, to decompose the universal joints. Clean out the old oil and refill with new oil for lubrication.
