齿轮泵密封垫的选用原则是，对于要求不高的场合，可凭经验选取，不合适时再更换。
The gear pump seals the selection principle is not high demand, for the occasion, but by experience, not to replace timely selection.
介绍塑料齿轮键槽和轮毂的设计原则，以及常见的结构设计方法。
This paper introduces the design principles of keyslot and hub of plastic gear and common methods of structural design.
介绍了机床齿轮的特点、热处理特点及结构设计原则。
The character of the gear for machine tool, heat treatment and principle for structure design are introduced.
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