Test method for friction torque of back-to-back pairing minitature ball bearing under application of axial loads

Abstract

The invention relates to a test method for a friction torque of a back-to-back pairing minitature ball bearing under application of axial loads. According to the invention, the test method uses an auxiliary device that comprises a preloaded bolt (1), a loading ring (2), and a back shaft (6). A paired first tested minitature ball bearing (3) and a paired second tested minitature ball bearing (4) are installed in the auxiliary device. an axial load is applied on axial end faces of inner rings of the paired tested minitature ball bearings by the preloaded bolt. And then, the assembled auxiliary device is installed on a minitature ball bearing friction torque tester. At this time, a total weight of the preloaded bolt, the loading ring and a grating rotor (5) forms an axial force of the first tested minitature ball bearing and the second tested minitature ball bearing during the friction torque testing process. Under the effect of the axial force, a starting friction torque or a dynamic friction torque of the back-to-back pairing minitature ball bearing is tested according to different rotating speeds or different rotation directions of a central shaft (7) of a test head. The method is correct and feasible as well as is simple and is easy to be carried out; the result is reliable; and the method has an actual application effect.

Description

technical field [0001] The invention belongs to the technical field of friction torque testing of paired miniature bearings, and in particular relates to a friction torque testing method under axial load applied to back-to-back paired miniature ball bearings. Background technique [0002] Some mechanisms in the fields of aerospace, aviation, and navigation require that the miniature ball bearings used have low friction torque, high positioning accuracy, and high axial and radial rigidity when working at low speed or swinging under strong vibration and impact conditions. . In order to meet these requirements, miniature ball bearings installed in pairs and with axial preload are mostly used. The friction torque of paired miniature ball bearings is a key factor to ensure the precise and reliable operation of some of the above mechanisms. Therefore, it is very important to accurately test the friction torque of paired miniature ball bearings. [0003] Customize the method of a...

AI Technical Summary

Problems solved by technology

[0004] At present, the miniature ball bearing friction torque tester used in the bearing industry can only be used to test the friction torque of a single set of miniature ball bearings, and it is not possible to directly use the miniature ball bearing friction torque tester for the back-to-back pair of miniature ball bearing friction torque tests. Through the cooperation of a set of auxiliary devices, the test of the friction torque of miniature ball bearings back-to-back can be realized in the miniature ball bearing friction torque tester

Images