By using geometry analysis method, this paper educed calculation formula of normal direction gear side clearance when internal gearing involute gear transmission center distance waned slightly.

通过几何分析的方法，导出了内啮合渐开线齿轮传动中心距略变小时，法向齿侧间隙的计算公式，供齿轮传动设计计算之用。

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The home side changed gear as if batting in the middle of a one-day international and England let them, opting to try and restrict runs rather than putting fielders in catching positions.

BBC: Warne took two wickets and helped in a run out in the morning

United dominated the first half without ever hitting top gear against an efficient Villarreal side.

BBC: Man Utd 0-0 Villarreal

Pioneer's DJ gear might be known for being on the pricey side, but for what it's worth, the gear is usually solidly built.

ENGADGET: Pioneer XDJ-Aero review: a DJ controller that loves music, hates physical formats