Biaxial loading four-line contact pure rolling cylindrical roller fatigue life testing machine

Abstract

The invention relates to a biaxial-loading four-line-contact fatigue life testing machine for a pure-rolling cylindrical roller. The testing machine comprises a machine base, an oil tank, an oil pump, a motor, a core testing apparatus, a loading mechanism, a transmission mechanism and a data acquisition system, wherein the oil tank, the oil pump and the motor are arranged in the machine base; an upper support is mounted on the machine base; the core testing apparatus employs two axles for simultaneous application of same load to realize effective adjustment of the centering performance of test rollers of different diameters, is a core mechanism capable of carrying out four-line-contact pure-rolling contact test on the test rollers, and is mounted in the upper support; the oil tank is connected with the core testing apparatus via the oil pump and supplies oil to the core testing apparatus for lubrication of the core testing apparatus; the loading mechanism is arranged on the upper part of the upper support and connected with the core testing apparatus, and can realize test loading; and the motor is connected with the core testing apparatus via the transmission mechanism for realization of rolling fatigue testing of the cylindrical roller. The biaxial-loading four-line-contact fatigue life testing machine for the pure-rolling cylindrical roller in the invention can realize four-line equal-load contact and pure rolling of the test rollers and guarantees that four-line-contact stress of is symmetrical and equal during testing of rollers of different diameters, so the cylindrical test roller undergoes completely-identical uniformly-distributed-line-load pure-rolling contact four times in each intact rotation during fatigue life testing; and thus, the purpose of improving the accuracy and reliability of test results is achieved.

Description

technical field [0001] The invention relates to a contact fatigue life testing machine, in particular to a biaxial loading four-wire contact pure rolling cylindrical roller fatigue life testing machine. Its purpose is to improve the problems existing in the authorized utility model patent "bearing roller rolling contact fatigue life testing machine" ZL-2011-20060989.7, so as to improve the loading accuracy and test reliability of the testing machine, which belongs to the technical field. Background technique [0002] Rolling bearings are widely used in modern electromechanical equipment as a high-reliability basic element, even under ideal conditions (such as correct design, selection, installation and commissioning, good lubrication, sealing, and light loads) The surface material of the rolling bearing is repeatedly subjected to high contact stress, and cracks will appear on the surface or sub-surface, which will eventually lead to the failure of the rolling bearing, that i...

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Problems solved by technology

[0004] The purpose of the present invention is to make up for the shortcomings of the current research on the life test of a single cylindrical roller, and to overcome the geometric asymmetry of the force points of the rollers to be tested in different sizes in the traditional bearing fatigue life testing machine, and to meet the requirements of the roller bearings. To meet the requirements of the rollers operating under the conditions of increasing load and rotating speed, a biaxial loading, four-wire contact, pure rolling cylindrical roller fatigue life testing machine is provided. Wide and high stability; its core is to improve the problems existing in the authorized utility model patent "Bearing Roller Roller Contact Fatigue Life Tester" ZL-2011-20060989.7, so as to improve the loading accuracy of the testing machine and the reliability of the test

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