Check the accuracy of bearing fit and preload methods

Preload, refers to the bearing before the load, by changing the relative position of the inner and outer rings, so that the bearing in the use of clearance. For household appliances bearings, preload the main role is to increase the bearing stiffness, vibration and noise suppression.

Preload impact on the bearing noise
Bearing radial load, due to the existence of radial clearance, only part of the ball bearing load, called the bearing zone, the other known as the non-bearing zone. During the movement of the ball from D to D in the non-bearing area, the resultant force and direction of the self weight and centrifugal force of the steel ball constantly change. The ball alternately collides with the raceway between the inner ring and the outer ring to generate abnormal noise inside the bearing. This kind of noise can be eliminated by preloading the bearing.

But the preload force Ambassador bearing friction increases, the temperature rise, reduce the bearing noise life. So choose the appropriate preload is very important.
(1) measuring shaft and bearing hole size to determine the bearing with the accuracy, with the following requirements:
The inner ring and the shaft to take an interference fit, the amount of interference 0 ~ +4μm (light load, high precision 0); outer ring with the bearing seat hole to take the gap with the amount of 0 ~ + 6μm gap (but at the free end of the bearing The use of angular contact ball bearings, but also increase the gap); axis and seat hole surface roundness error of 2μm or less, the bearing spacer used in the parallelism of 2μm or less, shoulder end surface of the outer end of the beating in 2μm or less; Bearing hole blocking shoulder on the axis of the beating in the following 4μm; spindle front end surface of the axis of the beating in 4μm or less.
 (2) The installation of the fixed front bearing on the shaft
Clean the bearings thoroughly with clean kerosene. For grease lubrication, first lubricate the bearings with 3% -5% grease into the bearing for degreasing and then grease the grease into the bearings with a grease gun Bearing space volume of 10% to 15%); heating the bearing so that the temperature was raised to 20 ~ 30 ° C, the bearing will be loaded into the shaft end with a hydraulic press; the adapter sleeve is pressed against the shaft and pressed against the bearing end face with an appropriate pressure so that its axial Positioning; the spring balance of the tape roll in the bearing outer ring, with the method of measuring the starting torque to check the provisions of the pre-load whether there is a significant change (even if the bearing is correct, but due to the cooperation or cage deformation, preload The possibility of change).

Hunan Jintai Hardware and Machinery Co.,Ltd. is a professional manufacturer on various kind of bearings over 15 years China factory.
We are making all kinds of slide bearings including DU PTFE composit bushing, DX POM composite bushing,bimetal bushing,wrapped bronze bushing, cast sliding bushings and wear plate bearing pad, sintered bronze bushing and sintering parts, ball transfer bearings, etc.
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