| 摘要 |
A double-eccentric friction drive (20) having a natural and automatic friction-increasing effect under load includes a friction ring (28) and a wheel (26) which is located eccentrically with respect to the friction ring (28), and a ring-shaped wedged member (24) that is eccentric relative to the wheel (26) and the friction ring (28) and whose side wall is held against the friction ring (28) by the wheel (26). The drive includes both orbital versions in which the wheel (26) orbits about the center of the friction ring (28) and the wedged member (24) orbits and rolls about the friction ring (28), as well as non-orbital versions in which one of the friction ring, wheel, and wedged member is rotatably driven about its axis, and the other two components are thereby forced to rotate about their axes. In continuously variable embodiments (50) of the friction drive, one or more of the three members comprises a pair of space-apart halves (52) whose spacing from each other is infinitely adjustable, and one or more of the members includes tapered surfaces (60) which coact with the movable halves so as to effectively vary the diameters of contact surfaces between the members. The eccentricity of the wheel (58) is infinitely adjustable in harmony with the movable halves to constantly urge the wedged member (56) against the friction ring (52), whereby the ratio of an input speed to an output speed of the drive is infinitely adjustable.
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