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The importance of bearing usage environment on operating trajectory

The selection of specifications, dimensions, and accuracy should be based on the location of use, usage conditions, and environmental conditions. Matching with suitable bearings is a prerequisite for ensuring the lifespan and feasibility of unidirectional bearings.

1. Usage: Unidirectional bearings are suitable for bearing combined radial and axial loads, mainly radial loads. They are usually paired with two sets of bearings and are mainly used in transmission parts such as front and rear wheel hubs, active bevel gears, differentials, reducers, etc. of automobiles.

2. Permissible speed: In a properly installed and well lubricated environment, it is allowed to be 0.3-0.5 times the maximum speed of the bearing. Under normal circumstances, a limit speed of 0.2 times is recommended.

3. Allowable tilt angle: Unidirectional bearings generally do not allow the shaft to tilt relative to the housing hole. If there is a tilt, it should not exceed 2 '.

4. Permissible temperature: Under normal load conditions, with lubricant having high temperature resistance and sufficient lubrication, general bearings are allowed to operate at an ambient temperature of -30 ℃ -150 ℃.

When the bearing rotates, the raceway surface of the inner and outer rings is in rolling contact with the rolling element, so the running trajectory is a dark surface. The bearing running trajectory attached to the raceway surface is not abnormal, and thus the load conditions can be determined. Therefore, when removing the bearing, please pay close attention to and observe the running trajectory of the raceway surface. If you carefully observe the running trajectory, you will know that it only bears radial loads, bears large axial loads, one-way bearings bear torque loads, or there is extreme stiffness inequality on the bearing box. It can be checked whether unexpected loads have been applied to the bearings and whether installation errors are significant, and become a clue to investigate the cause of bearing damage.

If the selection is not incorrect and can be used correctly, before the bearing life, but for a long period of time, in this case, the damage state is peeling. On the other hand, there is also unexpected early damage to the bearing that cannot withstand use. As the cause of this early damage, there are insufficient considerations in use and lubrication, as well as foreign object invasion, assembly errors and large shaft deflection of the bearing, and insufficient research on the shaft and bearing box of the bearing.

It can be said that there are many cases where bearings overlap with each other. So, based on a thorough understanding of the machine used for the bearing, the operating conditions, and the structure of the bearing periphery, if the condition before and after the accident can be understood, and combined with the damage situation of one-way bearings and multiple reasons for investigation, it can prevent similar accidents from happening again.

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