Precise combination bearing with adjustable pre-tightening force

Abstract

The invention relates to a precise combination bearing with adjustable pre-tightening force. The precise combination bearing with adjustable pre-tightening force comprises a small inner ring, a largeinner ring, an outer ring, an axial retainer, axial rollers and a radial roller, wherein the small inner ring is arranged on the small inner ring; the axial rollers are tapered rollers, and the linearspeeds of the two ends of each axial roller are consistent; tapered grooves matched with the axial rollers in size and shape are formed in the axial retainer; the axial rollers are mounted in the tapered grooves; the surfaces, correspondingly contacted with the axial rollers, of the small inner ring and the large inner ring are inclined surfaces matched with the tapered surfaces of the axial rollers; the outer end of each axial roller is provided with a pre-tightening device capable of adjusting pre-tightening force, and the pre-tightening devices are arranged outside the axial retainer; theradial roller is a spherical roller; each pre-tightening device comprises a piston, a spring and a small threaded plug; and the springs are connected with the axial rollers through small ball bodies.The precise combination bearing with the adjustable pre-tightening force has the advantages of high transmission rigidity, stable transmission, convenient mounting, high precision of machine operationand the like, and is not influenced by the speed difference of long-time operation.

Description

technical field [0001] The invention belongs to the technical field of bearings, in particular to a precision combined bearing with adjustable preload. Background technique [0002] Most of the traditional YRT bearings use cylindrical rollers for transmission to bear the axial force. Under normal circumstances, the predetermined work can be completed, but because the shape of the rollers is cylindrical, the linear velocity at the end near the center of rotation It will be lower than the end far away from the center of gyration, so there is a speed difference. When the speed difference is continuously accumulated, it will be manifested in the form of a small displacement of the cylindrical rollers, and finally a small jerky displacement of the cylindrical rollers will occur. Macroscopically, thrust roller bearings using cylindrical rollers as rotating bodies may vibrate irregularly under normal working conditions, and the vibration is the release of the previously accumulate...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problems existing in the prior art, the present invention provides a precision composite bearing with adjustable preload, which effectively solves the difficulty in assembling the traditional YRT bearing, the axial rollers are unstable during operation, and the radial rollers cannot be controlled. The problem of clearance; ensure the stable operation of the bearing and enhance the rigidity of the transmission

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