自动攻丝机需要两种速度,且两种速度的速比相差50倍左右,一般机械传动较难实现。为此,我们设计了一种双速行星减速器(图1),满足了攻丝机的需要。减速器的传动简图如图2所示,E轴是输入轴(电机轴),轴上装一齿轮(Z_a=26),与行星轮(Z_g=38)相啮合。两个行星齿轮又与两个内齿轮啮合,一个是固定不动的内齿轮Z_b=104,另一个是能够转动的内齿轮Z_c= Automatic tapping machine requires two speeds, and the speed difference between the two speeds of about 50 times, the general mechanical transmission more difficult to achieve. To this end, we designed a two-speed planetary reducer (Figure 1) to meet the needs of the tapping machine. The transmission of the reducer is shown in Figure 2. The E-axis is the input shaft (motor shaft). The shaft is equipped with a gear (Z_a = 26) which meshes with the planetary gear (Z_g = 38). The two planetary gears are meshed with two internal gears, one is a stationary internal gear Z_b = 104 and the other is a rotatable internal gear Z_c =