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 An approach of 'Power Method' for directly calculating internal spur gear and meshing efficiency of the involute reducer with minimum teethdifference is suggested, and calculation formulas are derived. By comparing all these with the current 'Meshing Power Method', the author holds that the influence of the gear meshing parameters on the meshing efficiency is very important, and provides ways to better efficiency. This approach is simple andconvenient for calculation and its... An approach of 'Power Method' for directly calculating internal spur gear and meshing efficiency of the involute reducer with minimum teethdifference is suggested, and calculation formulas are derived. By comparing all these with the current 'Meshing Power Method', the author holds that the influence of the gear meshing parameters on the meshing efficiency is very important, and provides ways to better efficiency. This approach is simple andconvenient for calculation and its physical concepts are clear also. It is of guiding significance to a certain degree in designing the involute reducer of this kind.  本文提出用“功率法”计算渐开线内啮合直齿圆柱齿轮传动和少齿差减速器的啮合效率,推导了计算公式,并与现行的“啮合功率法”进行了对比分析。明确指出:齿轮的啮合参数对啮合效率的高低有着重要的影响。指出了提高啮合效率的途径。此法,物理概念明确,计算简单方便,对渐开线少齿差减速器的设计有一定的指导意义。  The relationship of efficiency,flow direction of meshing power and motion parameter of nonH closed epicyclic gear train are researched.A simple method is developed for judging flow direction of meshing power according to transmitting ratios of epicyclic gear train and closed transmitting train,and the much difficult problem for calculating efficiency is solved with the meshing power method.A unified formula is derived for efficiency of nonH closed epicyclic gear train.In addition,selflocking conditions... The relationship of efficiency,flow direction of meshing power and motion parameter of nonH closed epicyclic gear train are researched.A simple method is developed for judging flow direction of meshing power according to transmitting ratios of epicyclic gear train and closed transmitting train,and the much difficult problem for calculating efficiency is solved with the meshing power method.A unified formula is derived for efficiency of nonH closed epicyclic gear train.In addition,selflocking conditions of gear train of this kind are also analyzed.  研究了非 H封闭式周转轮系的效率、啮合功率流动方向与有关运动参数之间的关系 ,得到了依据差动轮系及封闭传动链的有关传动比判断啮合功率流向的简捷方法 ,解决了用啮合功率法计算效率的难点问题 ;并在此基础上 ,推导出非 H封闭式周转轮系的效率计算的统一公式 ;此外 ,还分析了非 H封闭式周转轮系的自锁条件 .  The relationship of efficiency, flow direction of meshing power and motion parameter of H closed epicyclic gear train are researched. A simple method is developed for judging flow direction of meshing power according to transmitting ratios of epicyclic gear train and closed transmitting train, and the very difficult problem of calculating efficiency is solved with the meshing power method. A unified formula is derived for efficiency of H closed epicyclic gear train. In addition, self locking conditions... The relationship of efficiency, flow direction of meshing power and motion parameter of H closed epicyclic gear train are researched. A simple method is developed for judging flow direction of meshing power according to transmitting ratios of epicyclic gear train and closed transmitting train, and the very difficult problem of calculating efficiency is solved with the meshing power method. A unified formula is derived for efficiency of H closed epicyclic gear train. In addition, self locking conditions of gear train of this kind are also analyzed.  研究了 H封闭式周转轮系的效率、啮合功率流动方向与有关运动参数之间的关系 ,得到了依据差动轮系及封闭传动链的有关传动比判断啮合功率流向的简捷方法 ,解决了用啮合功率法计算效率的难点问题 ;并在此基础上 ,推导出 H封闭式周转轮系的效率计算的统一公式 ;此外 ,还分析了 H封闭式周转轮系的自锁条件  
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