Failure mode analysis of micro machine gears and the limitation of micronization
微型机械齿轮的失效模式分析及微细化的局限性
基本信息
- 批准号:07455074
- 负责人:
- 金额:$ 5.7万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for Scientific Research (B)
- 财政年份:1995
- 资助国家:日本
- 起止时间:1995 至 1997
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
The reliability of the gearing for micro machine becomes quite low, when its design is worked out according to the conventional method load carrying capacity of gears. To clarify the cause of this phenomena, the reliability test of gears of module 0.1 to 1.0 mm and the theoretical investigation for that have been carried out and the following results are revealed :1.The influence of manufacturing error and alignment error on the gear reliability becomes considerably stronger, when the module of gears becomes small. The unavoidable misalignment of gear mounting in the device is main cause of it. The method of evaluation of that effect is proposed.2.Contaminants that exist in the lubricating oil of micro-gears damage tooth flanks by meshing-in. For microgears, the increase of tooth roof fillet stress is very large in comparison with the state for gears of moderate module. The damage of tooth flank itself does not so strongly increase the state of contact stress of tooth flank of micro-gear as the case of root stress.3.The probable meshing-in of contaminants between tooth crest and mating back tooth flank and that between back side tooth flanks at the beginning of tooth meshing induces sufficiently strong increase of tooth bending stress.4.Chemical compound layr such as white layr by nitriding or oxidized layr by quenching will be separated-off from the tooth flank during the operation. This will deteriorate the tooth flank form of micro-gears badly to reduce the load capacity of gears. The separation of such layr is a big cause of existence of contaminants in lubricant that has also bad influence to reduce the load capacity of gears as mentioned above.
微机械齿轮传动按传统的齿轮承载能力设计方法进行设计,其可靠性很低。为了弄清这一现象的原因,本文对模数为0.1 ~ 1.0mm的齿轮进行了可靠性试验和理论研究,结果表明:1.当齿轮模数变小时,制造误差和校直误差对齿轮可靠性的影响显著增大;装置中齿轮安装不可避免的不对中是造成这种现象的主要原因,并提出了这种影响的评估方法。2.微型齿轮润滑油中存在的污染物通过啮合破坏齿面。与中等模数齿轮相比,微型齿轮的齿根应力增加很大。齿面本身的损伤并不像齿根应力那样强烈地增加微齿轮齿面的接触应力状态。在啮合初期,齿顶与啮合后齿面之间以及齿背侧齿面之间的污染物进入,引起了足够大的弯曲应力增加; 4.氮化或氧化形成的白色层等化合物层在操作过程中,淬火层将从齿面分离。这将严重恶化微齿轮的齿面形状,降低齿轮的承载能力。这种层的分离是润滑剂中存在污染物的一个重要原因,污染物也对降低齿轮的负载能力产生不利影响,如上所述。
项目成果
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