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Evaluation of Performance and Development of Surface Treatment Method of Gears for Space Application

航天齿轮的性能评价及表面处理方法的发展

基本信息

批准号：
03555032
负责人：
ODA Satoshi
金额：
$ 2.5万
依托单位：
Tottori University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research (B)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1993
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-03555032/
关键词：
Gear Vacuum Friction Wear Solid Film Lubrication Low Temperature Bending Fatigue Strength プラスチック

项目摘要

The friction and wear characteristics of gears in vacuum were investigated. The running tests for S45C, SUS440C and MoS_2 coated SUS440C gears were carried out in air and vacuum environment by using the gear testing machine, and the coefficient of friction between the contacting tooth surfaces, the wear of the gear teeth and temperature changes of the gear teeth, the shaft, etc. were measured. One the basis of these results, the friction and wear characteristics of gears in vacuum were determined to a considerable extent.The impact and bending fatigue strengths of case-hardened gears with various case depths at low temperature (-60 。C) were also investigated. The impact and bending fatigue strength of case-hardened gears at room and low temperature, and the effects of case depths on these strengths and the effect of impact load on the bending fatigue strength were determined considerably.The main results obtained from this investigation are summarized as follows.1. The coefficient of friction of S45C gears in vaccum is larger than that in air, but that of SUS440C gears in vacuum is smaller, and that of MoS_2 coated SUS440C gears in vacuum is almost equal to that in air.2. The bending fatigue strength of case-hardened gears at low temperature (-60 。C) is larger than that at room temperature, but the impact strength at low temperature is smaller.3. The optimum case depth exists for the bending fatigue strength of case-hardened gears at low and room temperatures. The impact strength decreases with an increasing case depth.4. An impact load at low temperature has no effect on the bending fatigue strength when the impact load is smaller than the impact breaking limit load, while that at room temperature has an effect on the bending fatigue strength.Thus the load bearing capacity of gears at low temperature and in vacuum was determined, and the useful data for the design of gears for space application were obtained from this investigation.

研究了真空环境下齿轮的摩擦磨损特性。利用齿轮试验机对S45 C、SUS 440 C和MoS_2涂层SUS 440 C齿轮在空气和真空环境下进行了运转试验，测量了接触齿面间的摩擦系数、轮齿的磨损以及轮齿和轴等的温度变化。在此基础上，对齿轮在真空中的摩擦磨损特性进行了一定程度的测定，并对不同渗层深度的齿轮在低温（-60 ℃）下的冲击疲劳和弯曲疲劳强度进行了研究。（三）也进行了调查。研究了硬齿面齿轮在室温和低温下的冲击和弯曲疲劳强度，以及硬齿面深度对这些强度的影响和冲击载荷对弯曲疲劳强度的影响. S45 C齿轮在真空中的摩擦系数大于空气中的摩擦系数，而SUS 440 C齿轮在真空中的摩擦系数小于空气中的摩擦系数，而MoS_2涂层SUS 440 C齿轮在真空中的摩擦系数与空气中的摩擦系数基本相等.研究了硬齿面齿轮在低温（-60 ℃）下的弯曲疲劳强度。C）比室温下的大，但低温下的冲击强度较小.在低温和室温下，对于硬齿面齿轮的弯曲疲劳强度，存在最佳的硬化层深度。冲击强度随渗层深度的增加而降低.当低温冲击载荷小于冲击断裂极限载荷时，低温冲击载荷对弯曲疲劳强度没有影响，而室温冲击载荷对弯曲疲劳强度有影响，从而确定了齿轮在低温和真空环境下的承载能力，为航天齿轮的设计提供了有用的数据。