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Troubleshooting damage to the first shaft and rear bearing of the transmission

Troubleshooting damage to the first shaft and rear bearing of the transmission

2020-05-19

After driving 40,000 kilometers, the first shaft of the transmission rear bearing (50306#) was damaged continuously.In the process of troubleshooting this fault, several disassembly and inspection of transmission, no abnormal phenomenon was found;Measuring torsion bar spring adjusting screw, the height is 42mm, according to the standard;Check the position of the spline between the torsion bar spring and the fixed arms at both ends -- disassemble the two pull bars, and there is no problem.Only the left torsion rod spring adjustment screw and the rubber pad between the rear fixing arm are damaged, after replacing the rubber pad, troubleshooting.So far, it has traveled more than 5,000 kilometers, and the bearing still works normally.

CA6440 light passenger car, the front suspension adopts the vertical torsion bar type spring independent suspension, which is connected with the frame and steering knuckle through the connecting bar.The torsion bar spring is connected with the lower control arm through the torsion arm, and the lower control arm is connected with the frame through the front beam to form the front support.The torsion bar spring is connected to the transmission supporting beam through the fixing arm and adjusting screw, and the transmission supporting beam is connected to the frame to form the supporting beam.Forces and torques in all directions are transmitted by the connecting rod system and torsional torques are sustained by the torsion rod spring.In the process of driving, when the front wheels meet the horizontal impact force, the front wheels and steering knuckles are transmitted to the transmission support beam and frame through the torsion bar spring.When the front wheel encounters the impact force in the vertical direction, the front suspension is transformed into the torsional moment through the torsion bar spring, which is transmitted to the transmission support beam and the frame.The energy of all kinds of impact force and torque suffered by the front wheel is gradually absorbed by the tire, shock absorber, steering knuckle, tie rod spring, transmission beam and frame, so as to ensure the smoothness and safety of the vehicle.In order to enable the front wheels on both sides to effectively absorb and consume the forces and torques in each direction, a certain pre-torque force should be added when installing the torsion bar spring.This pre-torque is equivalent to a large spring and is used in conjunction with the shock absorber to de-energizes, while effectively absorbing the energy generated by the forces and torques from the front wheels in all directions.In order to make the two spring torsion bars have the same pre-torsion force, the installation and adjustment of the torsion bar spring must be in strict accordance with the technical standards, so as to ensure that the two front wheels in the process of transmission force and torque and energy absorption to achieve a balance.

The car's rod spring adjusting screw rubber pad damaged, although the car in static, the height of the adjusting screw is the same, but it is equivalent to increase the length of the left rod spring adjusting screw, is equal to reduce the pretorque of the left torsion rod spring.In the process of automobile movement, the relevant parts will be unequal and out of balance when transferring force and moment and absorbing and consuming energy.The transmission is directly connected to a beam that transmits forces and torques from the front wheels and absorbs energy, as well as forces and torques between the engine and the drive axle.Therefore, tie rod spring adjustment screw 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 first connected to the transmission and the main parts of the engine, transmission shaft "foorn" evil, stress points will focus on supporting both before and after the transmission of the first shaft bearing.The front bearing is the sleeve type sliding bearing, the rear bearing is the rolling bearing, the sliding bearing is bigger than the rolling bearing resistance, but the anti-destructive force is strong, therefore caused the transmission first shaft after the continuous damage of the bearing.


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