Machine element or mechanism – Gearing – Plural power paths to and/or from gearing
Patent
1988-06-09
1989-05-09
Wright, Dirk
Machine element or mechanism
Gearing
Plural power paths to and/or from gearing
74752B, 74781R, F16H 374, F16H 344
Patent
active
048277991
ABSTRACT:
An infinitely variable planetary transmission is used in a vehicle, such as motorcycle and remote-control model car. The transmission includes a driven shaft journalled within the end bore of an input shaft. A sun gear is sleeved rigidly on the driven shaft. A planet gear carrier is sleeved rotatably on the driven shaft and serves as a power output member. A first centrifugal clutch is interposed between a ring gear and the input shaft so that, when the rotational speed of the input shaft is increased, the ring gear rotates synchronously with the input shaft. A set of planet gears are mounted rotatably on the carrier and meshed with the ring and sun gears. A second centrifugal clutch includes friction shoes mounted on the carrier, and a rim clutch sleeved rigidly on the driven shaft. A uni-directional bearing limits the driven shaft to rotate only in the same direction as the input shaft. When the input shaft rotates at a low speed, the sun gear is fixed by the limiting action of the unidirectional bearing so that the rotational speed ratio of the carrier to the input shaft is low. When the input shaft rotates at a high speed, the second centrifugal clutch interengages the carrier and the driven shaft so that the ring and sun gears rotate in the same direction, achieving a high rotational speed ratio of the carrier to the input shaft.
REFERENCES:
patent: 2189220 (1940-02-01), Osborne
patent: 3063309 (1962-11-01), Grattan
patent: 3382736 (1968-05-01), Abbott
patent: 3670597 (1972-06-01), Grattan
patent: 3939734 (1976-02-01), Blanchette et al.
patent: 3962934 (1976-06-01), Boutin
patent: 4273008 (1981-06-01), Ishihara et al.
Campbell Christopher
Wright Dirk
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