| 摘要 |
A planetary sphere/ring gear, comprising a sphere and a ring, which are interconnected by a ball and a socket. The ball is located on the edge of a circular opening in the ring and the socket is located on the body of the sphere. Used in conjunction with this planetary sphere/ring gear is a pedal-powered three or more wheeled vehicle which comprises a chain wheel, and pedals which swivel and which swing on a cradle. An operator's seat also swings on said cradle. Even though traversing across slopes, the chain wheel, pedals and seat are in a straight-with-the-world position, which is a natural and comfortable position for pedaling. The planetary sphere/ring gear is needed in the vehicle to allow the toothed ring, with a drive chain around it, to change its axis to line up with the drive wheel, as it swivels and swings.
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