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Cracked gear-tooth meshing stiffness calculation method

A technology of meshing stiffness and cracks, which is applied in the field of accurate and efficient calculation of time-varying meshing stiffness of cracked gear teeth, can solve problems such as long time, fast speed, and low precision, and achieve the effect of a reliable theoretical basis

Active Publication Date: 2015-12-23
BEIJING UNIV OF TECH
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Problems solved by technology

The energy method is fast but the accuracy is not high, the experimental method is more accurate but requires a lot of time and better experimental conditions
The Ansys-based finite element method is more common and close to reality, but it also takes a relatively long time

Method used

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  • Cracked gear-tooth meshing stiffness calculation method
  • Cracked gear-tooth meshing stiffness calculation method
  • Cracked gear-tooth meshing stiffness calculation method

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Embodiment Construction

[0032] The present invention will be further described below in conjunction with the accompanying drawings and examples.

[0033] Such as figure 1 Shown is a working flow chart of a new method for calculating the meshing stiffness of cracked gears of the present invention. The specific implementation process is as follows:

[0034] (1) Use SolidWorks to establish a cracked gear tooth single tooth model and import it into Ansys. Simulate the actual meshing of gear teeth and solve the stress distribution of cracked gear teeth: In order to reduce the workload, the SolidWorks gear plug-in Geartrax2013 is used to automatically generate high-precision gears, and then the gears are cut to keep only one tooth and set at the root of the gear. The cracks at 70 degrees to the centerline of the gear teeth are converted into formats and imported into Ansys; the grid is divided to fix the inner ring of the pinion, and the simulated meshing force F is applied to solve the stress distributi...

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Abstract

The invention provides a cracked gear-tooth meshing stiffness calculation method. According to the method, firstly, a precise gear model is established by means of the Solid Works. After that, the stress distribution of cracked gear teeth is solved out based on the finite element solution. Then a curve is drawn along a region of the gear teeth wherein the stress is widely distributed. With the above curve as a boundary, an effective thickness of the gear teeth with the occurrence of cracks is defined. According to the above novel method, the effective thickness is introduced into the calculation on the meshing stiffness of the cracked gear teeth. Meanwhile, with the integration of the rigidness of faulted gear teeth and the rigidness of faultless gear teeth, the stiffness variation diagram over the entire meshing period can be figured out. The effective thickness of the gear teeth is defined by the curve instead of a widely applied straight line. Compared with the conventional straight line-based meshing stiffness calculation method, the above method is higher in accuracy. The meshing stiffness calculation accuracy of the above method is also proved.

Description

technical field [0001] The invention relates to a new method for calculating the meshing stiffness of cracked gear teeth, in particular to an accurate and efficient method for calculating the time-varying meshing stiffness of cracked gear teeth combined with finite elements. Background technique [0002] As a very important component in mechanical transmission, spur gears are widely used in various machinery. However, during the meshing process, the pressure angle at the meshing point of the gear teeth is constantly changing, and the number of teeth participating in the meshing is not constant, resulting in constant changes in the meshing stiffness of the gear teeth, coupled with manufacturing errors due to production equipment and technical levels, this is It causes vibration, impact, and noise when the gear teeth mesh. If there are cracks, the vibration will be more obvious. Based on this, scholars at home and abroad are committed to more accurate calculation of the stiff...

Claims

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Application Information

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IPC IPC(8): G01M13/02
Inventor 崔玲丽翟浩张飞斌
Owner BEIJING UNIV OF TECH
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