Patent ID: 7637841

Claim:
A continuously variable ratio transmission unit (“variator”) comprising a housing, a first input/output disc pair defining a first variator cavity, a second input/output disc pair defining a second variator cavity, the discs being mounted to the housing for rotation about a common variator axis, at least one first roller disposed in the first variator cavity and at least one second roller disposed in the second variator cavity, the rollers serving in use to transmit drive between the input and output discs, a first actuator for applying a biasing force to the first roller and a second actuator for applying an adjustable biasing force to the second roller, wherein the first actuator is coupled to a first carrier part, the housing and the first carrier part being formed such that the first carrier part can be mated with the housing by introducing the first carrier part to the housing along a direction substantially parallel to the variator axis, and the second actuator is coupled to a second carrier part, the housing and the second carrier part being formed such that the second carrier part can be mated with the housing by introducing the second carrier part to the housing along a direction non-parallel to the variator axis.