| 摘要 |
A phase regulating speed reducer(20) in a phase regulating apparatus (100) has first and second cup-shaped wave gear gear drives (30,40). A first wave generator (33) for the first wave gear drive (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 gear drive (40) are fixed together by a plurality of fastening bolts (60) so that these external gear are rotated together in a back-to-back state. A second wave generator (43) for the second wave gear drive (40) is made non-rotatable. During a normal power transmission time, the phase regulating motor is not operated. Therefore, the reduction ratio of the two drives is set equal, an input rotation of the first wave gear drive (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.
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