After the first transmission shaft bearing damage troubleshooting - bearing knowledge

A CA6440 light bus, after traveling 40000 kilometers, continuous transmission after the first axis bearing ( 50306 #) Damage failure. In the process of eliminate the fault, a few times overhaul transmission, are not found abnormal phenomenon; Measuring the torsion bar spring adjustment screw, height of 42 mm, along with prescribed standards; Check the torsion bar spring with both ends fixed arm to take the position of the keyway between - — The two pull rod disintegration of all inspection, didn't also found the problem. Just to the left of the torsion bar spring adjustment screw with fixed arm after the rubber pad is damaged, replace the rubber gasket, troubleshooting. Has more than 5000 kilometers, the bearings still work properly. CA6440 light bus, the front suspension using vertical torsion bar spring independent suspension type, by connecting rods connected with the frame and the steering knuckle. Torsion bar spring by twisting arms connected with the control arm, control arm and through beam connected to the frame, before the formation of bearing before. Torsion bar spring by fixed arm, adjusting screws are connected to the transmission bearing beams, supporting after transmission are connected to the frame beam forming. By connecting truss transfer in all directions of force and moment, withstand the torque by a torsion bar spring. Car in the process of driving, the impact of the front wheel in horizontal direction, the front wheel, steering knuckle by torsion bar spring to a transmission support beam and frame; The impact of the front wheel in the vertical direction, the front suspension with torsion bar spring into torque, spread to transmission support beam and frame. Front wheel by various energy of impact force and moment, by the tire, shock absorber, steering knuckle, spring bar, transmission parts such as beam and frame gradually absorbed, so as to ensure the comfort and security of the car. In order to make the on both sides of the front wheel in the direction of force and moment, can effectively absorb and consumption, when installing a torsion bar spring, to add a certain torque. The torque is equivalent to a big spring, with vibration and shock absorber with play, but also effectively absorb from every direction of the front wheel force and moment produced by the energy. In order to make the two spring torsion bar has the same torque, the torsion bar spring installation and adjustment must be in strict accordance with the technical standard operating, so as to ensure the two front wheel in heritability and torque, and in the process of absorbing energy equilibrium. The car's rod spring adjustment screw rubber pad damage, though, when the car in a static adjustment screw highly consistent, but is equivalent to increase the length of the lever on the left spring adjustment screw, torque is equal to the reduced left torsion bar spring. Vehicle movement process, the relevant parts in heritability and torque, and absorbing energy, will produce sizes and loss of balance. Transmission and transfer from the front wheel force and moment and absorb energy beam directly connected, but also transfer between the engine and drive axle force and moment. Screw rod spring adjusted rubber gasket damage, unilateral transmission in the process of loading, the degree of the 'unbalanced' will increase, and one of the results of this 'imbalance' role, is to make the connection transmission and engine main parts - — The first axis transmission 'foorn' evil, stress points to focus on supporting both before and after the transmission of the first shaft bearings. After before bearing for sliding bearing, bearing for rolling bearing, sliding bearing is bigger than rolling bearing resistance, but the damage resistance is strong, thus caused the continuous transmission after the first shaft bearing damage.