A CA6440 light passenger car, after driving for 40,000 kilometers, continuously suffered the failure of the first axle rear bearing (50306#) of the transmission. In the process of eliminating this fault, no abnormalities were found after several times of dismantling the transmission; the torsion bar spring adjustment screw was measured, the height was 42 mm, and the specified standard was attached; the position of the spline groove between the torsion bar spring and the fixed arms at both ends was checked. ——The two levers were all disassembled and no problems were found. Only the rubber pad between the torsion bar spring adjustment screw and the rear fixed arm on the left side is damaged. After replacing the rubber pad, the fault is eliminated. It has been driving more than 5,000 kilometers so far, and the bearing work is still normal.
The CA6440 light passenger car, the front suspension uses a vertical torsion bar spring independent suspension, connected to the frame and steering knuckle through connecting rods. The torsion bar spring is connected to the lower control arm through the twist arm, and the lower control arm is connected to the frame through the front beam to form a front support. The torsion bar spring is connected to the transmission support beam through a fixed arm and an adjusting screw, and the transmission support beam is connected with the frame to form a rear support. The force and moment in all directions are transmitted by the connecting rod system, and the torsion moment is received by the torsion bar spring. During the driving process, when the front wheel encounters the horizontal impact force, the front wheel and the steering knuckle are transmitted to the transmission support beam and the frame through the torsion bar spring; when the front wheel encounters the impact force in the vertical direction, the front suspension The frame is transformed into a torsional moment by a torsion bar spring and transmitted to the transmission support beam and the frame. The energy of various impact forces and moments on the front wheels is gradually absorbed by the tires, shock absorbers, steering knuckles, tie rod springs, transmission beams and frame parts to ensure the smoothness and safety of the car. In order to make the front wheels on both sides encounter the forces and moments in all directions, it can effectively absorb and consume. When installing the torsion bar spring, a certain pre-torque force should be added. This pre-torque is equivalent to a large spring that cooperates with the damper to provide vibration damping while also effectively absorbing the energy generated by forces and moments from all directions of the front wheels. In order to make the two spring torsion bars have the same pre-torque force, the installation and adjustment of the torsion bar springs must be strictly in accordance with the technical standards, so as to ensure that the two front wheels are balanced in transmitting force and torque and absorbing energy.
After the car spring adjustment screw rubber pad is damaged, although the height of the adjusting screw is the same when the car is static, it is equivalent to increasing the length of the left lever spring adjusting screw, which is equivalent to reducing the pre-torque of the left torsion bar spring. During the movement of the car, the related parts will produce different sizes and imbalances when transmitting forces and moments and absorbing energy. The transmission is directly connected to the beam that transmits the force and torque from the front wheels and absorbs energy, while also transmitting the forces and moments between the engine and the transaxle. Therefore, after the single-sided damage of the pull rod spring adjusting screw pad, the degree of "unbalance" will be aggravated during the force transmission, and one of the results of this "unbalance" effect is to connect the transmission to the engine. The main part of the transmission - the first shaft of the transmission is "screaming", the force points are concentrated on the front and rear bearings supporting the first shaft of the transmission. The front bearing is a sleeve type sliding bearing, and the rear bearing is a rolling bearing. The sliding bearing has greater resistance than the rolling bearing, but has strong resistance to damage, thus causing continuous damage to the rear bearing of the first shaft of the transmission.
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