Analysis of the causes of burns on imported bearings

The so-called burn injury state of the imported bearings means that the raceway wheel, the rolling element and the cage of the imported bearing are heated rapidly during the rotation until discoloration, softening, welding and damage.

The main cause of burns on imported bearings is the poor lubrication of imported bearings, the possibility of using irregular lubricants, or too many lubricants, too few, are incorrect. For related information on the lubrication of imported bearings, please refer to the introduction of the two articles "The Misunderstanding of Lubricating Grease in the Process of Repairing FAG Bearings" and "Introduction to Lubrication Technology in Imported Bearings".

Secondly, it may be an excessive load (preload is too large). The speed is too high. The play is too small. There is water or other foreign matter invading. If the above two cases are not the case, the accuracy of the shaft and the bearing housing is poor, and the deflection of the shaft is large. Seeing this, I think everyone wants to know the solution. First, we should study the lubricant and lubrication method, choose the bearing lubricant, and the amount of the lubricant, and correct the bearing selection. Research is to match, bearing clearance and preload, and to improve the seal. Check the accuracy of the shaft and bearing housing. Of course, if you have an expert next to you, let him operate and learn the best!

It is recommended that when using imported bearings, it is necessary to pay attention to the installation, lubrication, clearance and other aspects to be as accurate as possible.

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Transmission one-axis rear bearing damage inspection and troubleshooting

A CA6440 light passenger car, after driving for 40,000 kilometers, continuously showed the damage of the first axle rear bearing (50306#) of the transmission. In the process of sweeping this fault, several times the dismantling of the transmission, no abnormalities were found; the torsion bar spring adjustment screw was measured, the height was 42mm, and the rule of the rule was met; check the position of the spline groove between the torsion bar spring and the fixed arms at both ends. - All the two levers were crashed and checked, 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 changing the rubber pad, the problem is removed. 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 the connecting rod. The torsion bar spring is connected to the lower control arm through the twisting 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 support beam via 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 bar spring receives the changing torque. During the driving process, when the front wheel encounters the impact force in the direction direction, 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 by the torsion bar spring into a changing torque that is 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 be effectively absorbed and consumed. When the torsion bar spring is installed, 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 device and adjustment of the torsion bar spring must be strictly operated in accordance with the technical specifications, so as to ensure that the two front wheels reach equilibrium during the transmission force and torque and energy absorption.

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