| 摘要 |
A transmission arrangement is disclosed which comprises first and second variators (166, 169) each of which comprises an input race (150, 154) and an output race (152, 156). A plurality of rollers (276, 278) is arranged to ru n upon the input and output races to transfer drive from one to the other. T he races are mounted for rotation about a common axis and the inclination of the first variator's rollers is variable independently of the inclination o f the second variator's rollers, so that the two rollers are able to provide independently and continuously variable drive ratios. To provide traction b etween the rollers and races, a biasing device (216, 217) applies an axial f orce to one of the races, urging the rollers and races into engagement with each other. Each variator is provided with a shunt gear for providing forwar d, reverse and g eared neutral ratios, and to couple the variator input to t he shunt gear a coupling member (160) passes through the outer variator race s.
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