Inspection and maintenance of automotive wheel bearings

Hub bearings are important moving parts for automobiles. The hub axle bears the burden of reducing the frictional resistance during the operation of the chassis and maintaining the normal driving of the car. If the hub bearing fails, it may cause noise, bearing heat, etc., especially the front wheel is more obvious, which may lead to dangerous phenomena such as out of control. Therefore, the hub bearings must be maintained on schedule.
1. Inspection of the hub bearing (1) When checking the tightness of the hub bearing, firstly, the axle of the wheel at one end of the wheel of the vehicle is inspected, and the vehicle is safely framed with a vehicle stool, a wooden cover, and the like. (2) Turn the number of wheels to be inspected by hand to see if the rotation is stable and there is abnormal noise. If the rotation is not smooth and there is friction, the brake part is not normal; if there is no noise, the rotation is not smooth and it is loose when it is tight, indicating that the bearing part is not normal. The hub should be removed when the above abnormality occurs. For small cars, when inspecting the hub bearings, hold the upper and lower sides of the tires with both hands, and pull the tires back and forth with both hands and repeat them many times. If it is normal, there should be no feeling of looseness and blockage; if the swing has a feeling of looseness, the wheel should be removed. (3) Inspection of the brakes. Usually when inspecting the hub bearing, check the wheel brake device. If there is oil on the inside of the tire, it may be caused by oil leakage from the brake cylinder or brake hose. The cause should be identified and eliminated.
2. Maintenance of the hub bearing Before disassembling the hub, prepare the wheel hub for maintenance, stop the car and set up the axle to ensure the safety of the maintenance work. (1) Remove the decorative cover and dust cover of the hub shaft; (2) Remove the tire nut and tire, taking care not to damage the thread of the tire bolt. If it is a disc brake, remove the brake and use it to remove the lock ring or lock pin. (3) Remove the wheel hub with special tools; (4) Scrape the old grease in the bearing, journal and hub cavity, clean the hub bearing and journal with cleaning agent and wipe dry with cloth, and finally wipe the inner cavity of the hub with cloth . (5) Check the hub bearing and the bearing race, and find cracks, fatigue peeling and loose bearing rollers. Replace the bearing. If there is a pitting on the bearing race, the bearing should also be replaced. (6) Check the matching between the inner diameter of the bearing and the journal. The matching clearance should be no more than 0.1Omm. When measuring the journal, it should be measured at the upper and lower parts of the vertical ground (the largest wear part at this place). If the fit clearance exceeds the specified limit of use, the bearing should be replaced to return it to the normal fit clearance. Do not allow burrs and pitting on the journal to narrow the gap.

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Rolling mill bearing characteristics and maintenance

Rolling mill bearing features and maintenance:


First, the bearing characteristics of the rolling mill:

1. The roller and the raceway are in line contact or repaired line contact, and have large radial load carrying capacity, and are suitable for bearing heavy load and impact load. The friction coefficient is small, suitable for high speed, and the limit speed is close to the deep groove ball bearing.

2, can be moved axially, can adapt to the change of the relative position of the shaft and the shell caused by thermal expansion or installation error, can be used as a free end support.

3. The processing requirements for the shaft or the seat hole are relatively high. After the bearing is installed, the relative deflection of the outer ring axis should be strictly controlled to avoid contact stress concentration.

4. The inner or outer ring can be separated for easy installation and disassembly.

5, steel stamping cage, for high-speed bearings or bearings that require smooth operation, use a physical cage. Depending on the application and the user's requirements, cages with fiberglass reinforced plastics can also be designed and supplied.

Second, the maintenance, overhaul and abnormal treatment of rolling mill bearings:

1. In order to maintain the original performance of the bearing in a good condition for as long as possible, it is necessary to maintain, repair, and prevent accidents, ensure the reliability of operation, and improve productivity and economy.

2, the maintenance of the best working conditions corresponding to the mechanical operating conditions, regular. The content includes monitoring of operating conditions, replenishment or replacement of lubricants, and periodic disassembly inspections. Valve imported pump industrial washing machine

3. As a maintenance item in operation, there are bearing rotation sound, vibration, temperature, lubricant status, and the like.

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