| 摘要 |
A phase regulating speed reducer (20) in a phase regulating apparatus (100) has first and second cup-shaped wave motion gearings (30, 40). A first wave motion generator (33) for the first wave motion gearing (30) is connected to a phase regulating motor. A first flexible external gear (32) and a second flexible external gear (42) of the second wave motion gearing (40) are fixed together by a plurality of fastening bolts (60) so that these external gears are rotated together in a back-to-back state. A second wave motion generator (43) for the second wave motion gearing (40) is made non-rotatable. During a normal power transmission time, the phase regulating motor is not operated. Therefore, when the reduction ratio of the two gearings is set equal, an input rotation of the first wave motion gearing (30) into a first rigid internal gear (31) is outputted at the same rotational frequency from a second rigid internal gear (41). According to this arrangement, a phase regulating apparatus having a low rotation transmission error can be manufactured at a low cost. <IMAGE> |
