Test method and test device for gear tooth root bending fatigue durability

Abstract

The gear dedendum bending fatigue durability testing device disclosed in the present invention includes a strain gauge attached to the tooth root of the gear to be tested and a pressing piece adapted to the shape of the gear to be tested. The pressing piece is pressed into the tooth groove of the gear to be tested. A silicone rubber pad is arranged between the pressure piece and the gear to be tested; a patch template fitted on the tooth surface of the gear to be tested is also included; the strain gauge is connected to the slip ring through a lead wire, and the slip ring is connected to a strain gauge through a wire. The testing method disclosed by the present invention includes seven steps of determining the maximum stress point area, making a patch template, making a pressing piece, sticking and protecting the strain gauge, calculating the sampling frequency, durability testing and data processing. The test method can accurately carry out the fatigue durability data of gear products, and provide a basis for the design and use of gear transmission devices; Convenient and accurate test results.

Description

Technical field [0001] The invention belongs to the technical field of mechanical testing methods, and in particular relates to a method for testing gear tooth root bending fatigue durability. The invention also relates to a testing device for implementing 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 gearing, external gearing, and rack and pinion transmission. Regardless of whether the gear is working on one side or on both sides, the force on the gear teeth during transmission causes the tooth root bending stress to be the largest, there is stress concentration, and every revolution, the stress changes once. Under the repeated action of the load, the bending stress exceeds At the end of the bending endurance, fatigue cracks will occur in the tooth root, and the cracks will gradually expand, which will eventually cause fatigue fracture...

AI Technical Summary

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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