| 摘要 |
A speed change device for use in driving auxiliary machinery, comprising an auxiliary machinery driving pulley as an output member, an input member fixed to a driving shaft of an engine, a planetary gear transmission connecting changeably in speed between the auxiliary machinery driving pulley and the input member, and a hydraulic control unit for controlling the planetary gear transmission. The planetary gear transmission comprises a planetary gear set, a one-way clutch and a clutch equipped with a hydraulic servo. The hydraulic control unit has a centrifugal type governor valve which switches between feed and release a feed oil pressure to the hydraulic servo according to an increase or decrease in the number of revolutions of the driving shaft. The planetary gear set includes a planetary carrier connected to the auxiliary machinery driving pulley, a ring gear connected to the input member and a sun gear connected to support means which is fixed to the engine block through the one-way clutch, the ring gear and the sun gear being connected engageably and disengageably by the clutch equipped with the hydraulic servo.
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