Thrust Ball Bearing Assembly Has Two Key Points
Thrust ball bearing assembly has two key points. One is the control of the quality of the cage and the ball, and the other is the control of the nominal height T after the assembly of the bearing. In addition, due to the shaft ring, seat can be separated, bringing a management problem. Is to prevent imported bearings parts mixed. M-type stamping cage using crimping die. After pressing the steel ball in the pocket to turn flexible, but can not fall off from the pocket, and technical procedures to check the ball in the pocket hole in the amount of movement. Solid cage pressing pressure is too deep will make the ball ball movement is small, and the embossed convex part of the connection with the cage is too small and insufficient strength, prone to block the phenomenon, causing the cage to scrapped. Small thrust ball bearing seat ring and shaft diameter diameter difference is very small, there is no significant difference between the two groups. In order to prevent the emergence of mixed sets of phenomena, that is loaded into a set of bearings Tao Tao sets are trapped or are the axis of the situation. This requires some action. Usually with the help of auxiliary tooling will be zoning, seat group to distinguish, or in the sampling of the nominal height before the diameter check with the diameter of the inner diameter, in order to check the inner diameter is convenient, put the seat down, the shaft placed above. If the seat diameter has a significant quenching and heating oxidation or no grinding, there is no need to test the inner diameter, can clearly see the difference between the shaft and the seat, not easy to mix. Thrust ball bearings need to be assembled after the nominal height T to be measured, confirmed that the lilies. When measuring, with a height block or standard parts calibration, and to measure the load, the bearing to be rotated dozens of times, be sure to reach the minimum height.
When the thrust ball bearing in high-speed operation, the ball and raceway radial plane of the contact angle will be affected by centrifugal force, causing the ball relative to the raceway sliding. This sticking wear causes damage to the bearing. To prevent this damage, must ensure that the thrust ball bearing by the minimum load, see formula 1 or formula 2, take the larger calculation. The
Formula 1: Famin = K · n * n
Formula 2: Famin = Coa / 1000
Famin: minimum axial load (N)
K: minimum axial load factor
n: speed (per minute)
Coa: Basic static load rating (N)
One-way thrust ball bearings can only bear the load in one direction, if you bear the load in both directions, you must use two-way thrust ball bearings. Thrust ball bearings must be applied with minimum or preload. When the axis is vertical, the weight of the shaft usually exceeds the minimum load. At this time due to the opposite direction of the axial load, the role of the load may be reduced.