| 摘要 |
A series of electric valve drive units is provided, which can set up rotational efficiency and anti-counter-rotating function of a valve body in accordance with a use application, with realizing miniaturization and reduction in space of the unit. In a series of electric valve drive units which can drive a valve body via reduction gears, at least one gear mechanism of the reduction gears is provided with an eccentric wobbling inscribed gear type of a planetary gear mechanism which has an input shaft, an external gear eccentrically and wobbly rotating about the input shaft, an internal gear engaged with the external gear, and a carrier absorbing a wobbling ingredient of the external gear, wherein one of the internal gear and the carrier is secured, and the other is coupled to a valve body side. Eccentric wobbling rotational resistance of the external gear is different from each drive unit. At least two types of valve drive units are supplied, one of which places prime importance on the anti-counter-rotating function, and the other places prime importance on the rotational efficiency.
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