| 摘要 |
1531495 Toothed gearing; change-speed gear COMPUDRIVE CORP 11 Nov 1975 [6 Dec 1974] 46481/75 Headings F2D and F2Q An input shaft 7 has an eccentric portion 7a on which are rotatably mounted orbital gears 13, 15, secured together by bolts 19, the gear 13 meshing and having one less tooth than the number of rollers 14a on a fixed gear 14, and the gear 15 meshing and having one less tooth than the number of rollers 16a on a gear 16 which is splined to an output shaft 8. Fig. 4 shows an embodiment of a variable speed gear in which four orbital gears 13<1>, 33, 32 and 15<1> are secured together and a slidable shift member 31 is adapted to engage one of three locking pins 30, 37, 36 in order to prevent rotation of the associated internally toothed gear. In each gear pair, one gear has teeth in the form of lobes which follow a substantially continuous epitrochoidal curve and the other gear has teeth in the form of respective arcuate surfaces having the same radius of curvature and centred on a common arc.
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