A Fatigue Failure Life Prediction Method of Plastic Worm Gear Including Temperature Factor

A fatigue damage and temperature factor technology, applied in the direction of instrumentation, geometric CAD, design optimization/simulation, etc., can solve problems such as limited use range, reduced fatigue strength of plastic worm gears, and low fatigue strength, so as to improve safety and reliability and avoid early Fatigue failure, the effect of reducing the probability of fatigue fracture

Active Publication Date: 2022-07-19
BOSCH HUAYU STEERING SYST CO LTD
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Problems solved by technology

However, due to the low hardness, small elastic modulus and low fatigue strength of plastic worm gears, its application range is limited.
[0003] The existing fatigue strength design methods of plastic worm gears generally use the traditional fatigue S-N curve to check and evaluate, which fails to fully take into account the influence of temperature
However, due to the poor heat dissipation effect of plastic worm gears, in the actual operation process, the temperature may be as high as above 100 °C. Higher operating temperatures will cause the plastic to reach above the glass transition temperature and soften, which will cause the fatigue strength of the plastic worm gear to decrease sharply, resulting in plastic Early High Temperature Fatigue Damage of Gears

Method used

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  • A Fatigue Failure Life Prediction Method of Plastic Worm Gear Including Temperature Factor
  • A Fatigue Failure Life Prediction Method of Plastic Worm Gear Including Temperature Factor
  • A Fatigue Failure Life Prediction Method of Plastic Worm Gear Including Temperature Factor

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Embodiment Construction

[0024] The present invention will now be further described with reference to the accompanying drawings.

[0025]The present invention provides a method for predicting the fatigue failure life of a plastic worm gear that incorporates a temperature factor, comprising the following steps: Step 1, using a plastic worm gear fatigue test bench with a temperature control box to control the ambient temperature of the plastic worm gear fatigue test box T=40°C , 60°C and 100°C, and apply the set torques P=60Nm, 70Nm, 80Nm, 90Nm, 100Nm, 110Nm and 120Nm respectively for different ambient temperatures T, and obtain the fatigue corresponding to the application of different torques for plastic worm gear materials at different ambient temperatures Destruction life N; see the meshing diagram of plastic worm gear and worm figure 1 , see the experimental data figure 2 .

[0026] Step 2, establish the fatigue failure life S-N formula: N=N0×(P / P0) -a(T) ×10 -b(T)×(T / T0-1) . In the formula, P...

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Abstract

The invention relates to the technical field of strength analysis of mechanical parts, in particular to a method for predicting the fatigue failure life of a plastic worm gear that incorporates a temperature factor. The new fatigue failure life calculation method can accurately predict the fatigue failure life of plastic worm gears at different temperatures. It provides strong theoretical and experimental support for the design, fatigue strength check and manufacturing of plastic worm gears, and can effectively avoid the early fatigue of plastic worm gears. Failure, reduce the probability of fatigue fracture of plastic worm gear, improve the safety and reliability of plastic worm gear operation.

Description

technical field [0001] The invention relates to the technical field of strength analysis of mechanical parts, in particular to a method for predicting the fatigue failure life of a plastic worm gear which incorporates a temperature factor. Background technique [0002] The plastic worm gear has low friction coefficient, good wear resistance and high transmission efficiency, and can operate under no or less lubrication conditions. At the same time, the plastic worm gear has good elasticity, can absorb shock and shock, with low noise during operation and stable transmission. However, due to the low hardness, small elastic modulus and low fatigue strength of plastic worm gears, its application range is limited. [0003] The existing fatigue strength design methods of plastic worm gears generally use the traditional fatigue S-N curve for check evaluation, which fails to fully incorporate the influence of temperature. However, due to the poor heat dissipation effect of the plas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/17G06F30/20G06F119/02G06F119/08
CPCG06F30/17G06F30/20G06F2119/02G06F2119/08
Inventor 马洪顺房心强汪兵兵季娟李浩峰侯臣吴静奇
Owner BOSCH HUAYU STEERING SYST CO LTD
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