A fretting wear test device of involute spline pair under ultrasonic vibration

Abstract

The invention discloses a fretting wear testing device for an involute spline pair under ultrasonic vibration, and the device specifically comprises a pedestal, a drive unit, a tested unit, a supportdevice, a loading device, a measurement unit, and an ultrasonic vibration unit. The drive unit consists of a variable frequency motor and a shaft coupler. The tested unit comprises a shaft coupler I with an external spline, an internal spline shaft sleeve I, an external spline shaft, an internal spline shaft sleeve II and a shaft coupler II with an external spline. The spline pair in the tested unit is driven by the variable frequency motor to rotate, and a torque is applied through the loading device. In a rotating process, the tested unit is supported by the support device, and a laser displacement sensor in the measurement unit measures a non-centering quantity of the spline pair, wherein the non-centering quantity can be adjusted through the ultrasonic vibration unit. The device provided by the invention can simultaneously test the fretting wear of two or more groups of fixed involute spline pairs, and can truly simulate the wear condition of the spline pair in the fixed state in the transmission.

Description

technical field [0001] The invention relates to a fretting wear test device of an involute spline pair under ultrasonic vibration, and belongs to the technical field of fretting tribology in mechanical engineering. Background technique [0002] The involute spline pair is composed of inner and outer splines. The involute spline pair has the characteristics of good neutrality. In theory, the inner and outer spline shafts are completely centered, and the teeth of the spline pair are evenly loaded, but In fact, due to the influence of factors such as manufacturing errors, assembly errors, and overturning moments, the inner and outer spline shafts are misaligned. For the spline pair, the existence of misalignment will lead to uneven stress on each key tooth, and the local key teeth bear huge loads, so that the key teeth bear periodic alternating loads during the rotation of the spline shaft, while the internal and external splines The contact tooth surface will produce a large ...

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Problems solved by technology

[0002] The involute spline pair is composed of inner and outer splines. The involute spline pair has the characteristics of good neutrality. In theory, the inner and outer spline shafts are completely centered, and the teeth of the spline pair are evenly loaded, but In fact, due to the influence of factors such as manufacturing errors, assembly errors and overturning moments, there are misalignment of the inner and outer spline shafts

For the spline pair, the existence of misalignment will lead to uneven stress on each key tooth, and the local key tooth bears a huge load, so that the key tooth bears periodic alternating loads during the rotation of the spline shaft, while the internal and external splines The contact tooth surface will produce a large relative slip, which will lead to the failure of the spline pair due to fretting wear and fretting fatigue, and may even lead to the failure of some teeth due to instantaneous fracture due to excessive load or fracture due to conventional fatigue

[0003] The patent CN106124209A discloses a "spline pair fretting wear test bench". The test bench adjusts the angular misalignment and radial misalignment of the spline pair through a mechanical device. Although the simulation of the misalignment is solved, the test bench The mechanical method is adopted, and the simulated angular misalignment and radial misalignment are fixed quantities, while the angular misalignment and radial misalignment of the spline pair are variable during the actual operation; Because the material of the involute spline is generally relatively high in hardness, the general spline wear test is a long cycle and a long time. When designing the experiment, we should shorten the test period and reduce the cost of the test as much as possible.

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