Steering system: steering support base, steering column, steering oil pump Transmission system: rear output shaft, main shaft, reverse gear shaft, clutch, pump, solenoid valve, planetary gear set, shift fork Seat: seat adjuster, height Adjustment mechanism and seat frame Axles: drive train, kingpin brake system Hinge: door hinges, trunk, hood hinges, automatic door closers Engine management: water and oil pumps, tensioners, pulley dampers shock absorber.

Because most of the wheel bearings used in small passenger cars currently use sealed double-row angular contact bearings, these bearings are filled with grease to ensure the life-long lubrication requirements of the bearing, and the grease is sealed inside the bearing by the oil seal.


If the wheel hub bearing of this type of car is damaged during driving, the assembly is directly replaced, and no maintenance is required in the middle, so it can be said that this kind of wheel bearing is maintenance-free.

Automobile wheel bearings have now developed to the third generation: the first generation consists of double row angular contact bearings. The second generation has a flange on the outer raceway for fixing the bearing, and the bearing can be simply sleeved on the axle and fixed with a nut. Makes car maintenance easier. The third-generation wheel hub bearing unit is a combination of the bearing unit and the anti-lock brake system ABS.

Many automotive wheel bearings are sealed, and these bearings do not need to be greased for their entire life. Other unsealed bearings such as double row tapered roller bearings must be lubricated with grease during installation. Due to the different sizes of the inner cavity of the bearing, it is difficult to determine how much grease to add. The most important thing is to ensure that there is grease in the bearing. If there is too much grease, when the bearing rotates, the excess grease will seep out.