Correction method of equivalent load of axial film oil cylinder of bearing tester

Abstract

The invention relates to a correction method of the equivalent load of an axial film oil cylinder of a bearing tester, which is characterized in that a set of axial load test device is designed; the axial load test device comprises a left stationary bushing (14), a left positioning mandrel (15), a test pressure sensor (16), a flat head bolt (17), a right stationary bushing (18), a nut (19) and a ball head bolt (20); and after the whole axial load test device is positioned and installed on a base (1) of the bearing tester through the grooves of the left stationary bushing and the right stationary bushing, the correction test of the equivalent load of the axial film oil cylinder of the bearing tester can be carried out. By continuous correction on axial loads and computer correction operation, the correction method of the invention can improve the accuracy of the bearing tester in the axial loading process, enables the steady-state error of full range of the axial film oil cylinder in the loading process to be less than or equal to + / -1%FS, and provides more accurate and stable axial loads for a bearing test.

Description

technical field [0001] The invention belongs to the technical field of bearing testing equipment, and mainly relates to a method for correcting the equivalent load of an axial film oil cylinder of a bearing testing machine. Background technique [0002] figure 1 It is a general bearing testing machine. Most of the axial film cylinders 2 of this testing machine adopt the hydraulic loading method. The hydraulic oil applies axial load to the test bearing 12 through the axial loading piston 4 through the sealed axial rubber film 3. The magnitude of the axial load is equal to the pressure of the hydraulic oil in the axial film oil cylinder 8 multiplied by the area of ​​the axially loaded piston 4, and the axial load is an equivalent load. [0003] When the bearing testing machine is loaded, the computer controls the proportional pressure reducing valve in the hydraulic system to output a certain pressure of hydraulic oil, the actual size of the oil pressure P 实 The pressure sen...

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Problems solved by technology

[0005] Since the axial rubber film 3 will produce a certain elastic deformation under the action of oil pressure, this adds additional elastic resistance to loading

The edge loss of the piston area of ​​the film cylinder and the elastic deformation of the sealing rubber film make the actual axial load of the bearing testing machine not equal to the theoretical setting value of the computer during the test, especially at the low end load and the high end load. The error is larger, and the maximum steady-state error will exceed 5% FS of the full scale. The loading error directly affects the accuracy of the test data, making it difficult for the test results to truly and accurately reflect the performance indicators of the tested bearing.

[0006] In order to improve the accuracy and steady-state precision of the bearing testing machine under axial loading and provide more accurate and reliable test data for bearing tests, special testing devices and However, this technology is still blank in China, and the relevant literature has not been reported.

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