Studies on Precision Grinding of Internal Gears and Internal Speed Changers

本课题通过改进本课题设计制造的数控外啮合磨床的机构，研制出内啮合磨床。在齿轮磨床上采用伺服电机和单粒金刚石修整器对内齿轮形砂轮进行了自动整形。在试验内齿轮磨床上加工了模数为4,60齿、面宽为50mm的内齿轮。此外，太阳齿轮和行星齿轮的外齿轮由试验齿轮磨床完成。由于减速比不高，不含差速器，采用这些齿轮的内齿轮传动的动力传递效率高于98%。为提高减速比，设计制造了两种差动齿轮传动，并进行了运行试验。对某乘用车自动变速器内齿轮系的部分齿轮进行了磨削，研究了磨削对运行噪声和传动效率的影响。试验内齿轮传动效率高，但运行噪声不低。作为高性能的内啮合齿轮传动，设计制造了内啮合混合减速机，用环滚轮代替两个内啮合齿轮中的一个，用太阳滚轮和行星滚轮代替齿轮。这些混合减速器产生明显较低的运行噪音比内部齿轮传动，因为齿之间的冲击载荷是由辊之间的油膜修改。但需要注意的是，在齿轮箱尺寸一定的情况下，混合动力减速器的动力传输能力低于内齿轮传动。因此，在齿轮系统的设计制造方法和磨齿技术方面，降低内啮合齿轮传动的运行噪声还需要进一步系统的研究。少

An internal gear grinder was produced by improving the mechanism of a CNC (computer numerically controlled) external gear grinder which was previously designed and made by the present investigators. The form grinding wheel for internal gears was trued automatically on the gear grinder using the servo-motors and a dresser with a single diamond grain. Internal gears with a module of 4, 60 teeth and a face-width of 50 mm were finished on the trial internal gear grinder. Moreover, the external gears to be used for the sun and planetary gears were finished by the trial gear grinder. Power transmission efficiency of the internal gear drive with these gears is higher than 98% because the speed reduction ratio is not high and contains no differential mechanism.Two kinds of differential gear drives were designed and made to increase the reduction ratio, and running tests were conducted. Moreover some gears in the internal gear train of an automatic transmission of a passenger car were ground an … More d the effects of grinding on the running noise and power transmission efficiency were examined.The trial internal gear drives was high in the efficiency, but running noise was not low as expected. As hopeful high performance internal gear drives, internal hybrid reducer were designed and made, in which one of the two internal gears was replaced by a ring roller and the sun and planetary rollers were used instead of the gears. These hybrid reducers produced appreciably lower running noise than the internal gear drives because the shock loading between teeth is modified by the oil film between the rollers.However, it should be noted that the power transmission capacity of the hybrid reducers is lower than the internal gear drives when the sizes of the gear boxes are assumed to be constant. Therefore, further systematic investigation is required to reduce the running noise of internal gear drives in the field of the design and manufacturing method in gear systems together with gear grinding technology. Less