Features of Thrust Needle Roller Bearing

Thrust needle roller bearings are used to bear axial and radial combined loads mainly, but the radial load shall not exceed 55% of the axial load. Compared with other thrust roller bearings, this type of bearing has a lower friction coefficient, higher speed, and has self-aligning performance.

1. Selection and control of tolerance for thrust needle roller bearing chamber: After pressing in the thrust roller bearing, it should rotate flexibly without any obstruction. If there is obvious inflexibility in rotation, it indicates that the size of the shaft is too large and the tolerance needs to be lowered. If there is a noticeable "rustling" feeling when the thrust roller bearing is pressed into the shaft and rotated by hand, it may be due to excessive tolerance or poor roundness of the shaft. So when controlling the tolerance of the shaft and thrust needle roller bearing chamber, it is also necessary to control the roundness.
2. Assembly method of thrust needle roller bearings: As thrust roller bearings are high-precision products, improper assembly can easily cause damage to the grooves of the thrust roller bearings. Causing damage to the thrust roller bearing. The thrust needle roller bearing should have a dedicated mold during assembly and cannot be knocked randomly. When pressing the shaft, only the small ring can be subjected to force, and when pressing the large ring, only the large ring can be subjected to force. During assembly, it is required to use air pressure or hydraulic pressure. The upper and lower molds should be in a horizontal state during press fitting. If there is any inclination, it will cause damage to the groove of the thrust roller bearing due to force, resulting in a rattling of the thrust roller bearing.
3. Prevention of foreign objects during assembly: Iron filings generated during the dynamic balancing of the thrust needle roller bearing on the rotor are prone to enter the interior of the thrust roller bearing.So it is best to perform dynamic balancing before installing the thrust roller bearing. It is best not to apply oil or grease to the bearing chamber. If it is necessary to do so, it is necessary to control the accumulation inside the bearing chamber.
4. Prevention of paint rust: The characteristic of paint rust is that it is more common in sealed motors. This problem is mainly caused by the acidic substances evaporated from the insulation paint forming corrosive substances at a certain temperature and humidity.Which corrode the groove of the thrust needle roller bearing and cause damage to bearing. This problem can only be solved by selecting good insulation paint and assembling it after drying and ventilating for a period of time.

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