Method and device for testing gear tooth root bending fatigue durability

Abstract

The invention discloses a device for testing gear tooth root bending fatigue durability. The device comprises a strain gage and pressing sheets, the strain gage is attached to the tooth root of a gear to be tested, the pressing sheets are matched with the gear to be tested in shape, the pressing sheets are arranged in tooth grooves of the gear to be tested in a press-fit mode, and a silicon rubber pad is arranged between the pressing sheets and the gear to be tested. The device further comprises a paster sample plate arranged on the tooth face of the gear to be tested in a sleeving mode. The strain gage is connected with a sliding ring through a lead, and the sliding ring is connected with a strain gage meter through a wire. The invention discloses a testing method. The testing method comprises the seven steps of maximum stress point area determining, paster sample plate manufacturing, pressing sheet manufacturing, strain gage pasting and protecting, sample frequency calculating, durability testing and data processing. According to the testing method, the fatigue durability data of a gear product can be accurately carried out, and a design and use basis is provided for a gear transmission device. The testing device can test the gear tooth root bending fatigue durability of different sizes of gears under different working conditions, the structure is simple, operation is convenient, and the testing result is accurate.

Description

technical field [0001] The invention belongs to the technical field of mechanical testing methods, and in particular relates to a testing method for gear dedendum bending fatigue durability. The invention also relates to a testing device for carrying out the above method. Background technique [0002] Gear transmission is one of the most commonly used transmission methods in mechanical transmission. Common transmission forms include internal meshing transmission, external meshing transmission, and rack and pinion transmission. Regardless of whether the gear is working on one side or both sides, the gear teeth are stressed during transmission so that the bending stress of the tooth root is the largest, and there is a stress concentration, and the stress changes once every revolution. Under the repeated action of the load, the bending stress exceeds At the bending endurance limit, fatigue cracks will be generated in the tooth root, and the gradual expansion of cracks will eve...

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Problems solved by technology

[0003] Since strain gauges need to be pasted on the tooth root when testing tooth root bending fatigue, the pasting space is narrow, the pasting position is not easy to determine accurately, and the lead wire is difficult. Therefore, in the current gear transmission design, the tooth root bending fatigue must be checked through empirical formulas, or through Finite element method for calculation

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