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TIMKEN bearing preload intention and method
Source: China Bearing Network Time: 2013-09-18
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TIMKEN bearing; in most occasions; in working condition: with proper clearance application. According to the intention; also when assembling the bearing; pre-stress the bearing internal stress; so that the bearing has a negative play to apply; The application method is called preload. It is mostly suitable for such as centripetal thrust ball bearings; tapered roller bearings; the two bearings are used oppositely; it becomes a bearing capable of adjusting the clearance.
1. The primary intent of preloading: the primary intent and representation of preloading, such as the ability to give some examples to prove that:
(1) Together with the orientation of the radial axis and the axial direction of the correct resolution axis; the beating of the æº axis.
(2) The rigidity of the progressive bearing. The bearing of the spindle of the machine tool; the TIMKEN bearing for the differential organization of the bicycle.
(3) Avoid axial direction oscillation and abnormal sound formed by resonance. Bearings for small motors.
(4) Pressing the rotary sliding of the tumbling roll; revolving sliding and rotating sliding. High-speed rotating radial thrust bearing; thrust ball bearing.
(5) Pair and ferrule; adhere to the correct orientation of the rolling body. Thrust ball bearing; thrust spherical roller bearing; used in the horizontal axis.
2. The method of preloading: positioning preload is the relative orientation of the bearing axis of the German TIMKEN bearing; the preloading method will not be changed in the application. Here is an example:
(1) In order to perform the preload, the combined bearing with the difference in width or axial clearance is adjusted beforehand.
(2) Using an oversized cushion; a shim; to give the bearing a preload.
(3) Fasten the screw that can adjust the axial direction clearance; the method after the nut is used. In this case; in order to get the proper preload; TIMKEN imported bearings should be adjusted while measuring the starting conflict torque.
The so-called constant pressure preload; is the use of spiral spring; disc spring; give the bearing the proper preparation of the load. In use; the relative orientation of the bearing even if there is a change; the preload method. In use; Even if there is a change in the relative orientation of the exit, the preload can be roughly adhered to.
Preload line diagram of imported bearings after constant pressure preload; the rigidity of preload springs is compared with the rigidity of bearings; usually very. The rigidity of the single bearing of the ㄑ乖㘠傻 å‚» ヌ逯岢 ヌ逯岢 æ‹› æ‹› è½´å‘ è½´å‘ è½´å‘ è½´å‘ è½´å‘ è½´å‘ è½´å‘ è½´å‘ è½´å‘ è½´å‘ è½´å‘ è½´å‘ è½´å‘ è½´å‘ è½´å‘ è½´å‘ è½´å‘ å®šä½ å®šä½ å®šä½ å®šä½ å•ä½“ å•ä½“ å•ä½“ å•ä½“ å•ä½“ å•ä½“ å•ä½“ å•ä½“ å•ä½“ å•ä½“Comparison.
According to the rigidity of the preload method, the comparison between the positioning preload and the constant pressure preload is as follows.
(1) The condition that the preload is flat; the positioning preload is used to add bearing rigidity; that is, the positioning preload has the smallest displacement with respect to the TIMKEN bearing load.
(2) Positioning preload. In operation; the difference in axial elongation due to the temperature difference between the shaft and the outer casing; the difference in radial thermal expansion formed by the temperature difference of the inner ring outer ring; and the deformation caused by the load; The preload amount is changed. Under the condition of positioning the preload; the tension spring formed by the elasticity of the shaft has little weight; therefore, the change of the preload can be ignored. It is known that the positioning preload is usually applied. The intention of progressive rigidity; constant pressure preload is suitable for high speed rotation; demand avoids axial oscillation; horizontal axis uses thrust TIMKEN imported bearing bearing condition.
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