Transmission First Shaft Rear Bearing Damage Problem
Source: Bearing Network | Date: June 9, 2014
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A CA6440 light passenger car experienced repeated damage to the rear bearing (part number 50306) of the first shaft in the transmission after traveling approximately 40,000 kilometers. During the troubleshooting process, the transmission was removed several times, but no visible abnormalities were found. The torsion bar spring adjustment screw was measured at a height of 42mm, which matched the specifications. The orientation of the spline groove between the torsion bar spring and the two fixed arms was checked, and the levers were fully collapsed without any issues detected.
However, the rubber pad between the left torsion bar spring adjustment screw and the rear fixed arm was damaged. After replacing the rubber pad, the issue was resolved. To date, the vehicle has traveled over 5,000 kilometers, and the bearing continues to operate normally.
The front suspension of the CA6440 uses a vertical torsion bar spring independent suspension system. The connecting rod is attached to both the frame and the steering knuckle. The torsion bar spring connects to the lower control arm via a twisting arm, and the lower control arm links to the front beam, forming the front support structure. The torsion bar spring is connected to the transmission support beam through the fixed arm and the adjustment screw, and the transmission support beam is then attached to the frame, creating a rear support.
This system transmits forces and moments in all directions. When the front wheel encounters horizontal impact, the force is transmitted through the torsion bar spring to the transmission support beam and the frame. When the impact is in the vertical direction, the torsion bar spring converts it into torque, which is then transferred to the transmission support beam and the frame. The tire, damper, knuckle, yoke spring, transmission beam, and frame gradually absorb the impact forces and moments, ensuring the smoothness and safety of the vehicle.
To ensure that the front wheels can effectively absorb forces and moments from all directions, a certain pre-torque must be applied to the torsion bar springs. This pre-torque acts like a strong spring, working with the damper to reduce vibrations and absorb energy generated by the forces and moments from the front wheels. To maintain balance, the torsion bar springs on both sides must have equal pre-torque, which requires strict adherence to technical specifications during installation and adjustment.
When the rubber pad of the torsion bar spring was damaged, the adjustment screw height remained the same in a static condition, but the effective length of the left lever’s adjustment screw increased, reducing the pre-torque of the left torsion bar spring. This imbalance caused uneven force distribution during driving, leading to stress on the transmission. As a result, the first shaft of the transmission and the main components of the engine became misaligned, concentrating forces on the front and rear bearings of the first shaft.
The front bearing is a sliding bearing, while the rear one is a rolling bearing. Although sliding bearings are more resistant to damage, they are less durable under high stress. In this case, the imbalance led to excessive pressure on the rear bearing, causing it to fail.
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