| 摘要 |
A toroidal variable speed traction drive is provided. The drive comprises a driving disc (11) and a driven disc (10). The discs (10, 11) have a common axis of rotation. The inner face of each disc (10, 11) is formed with a negative shape of a toroid. The drive further comprises a plurality of roller assemblies interposed between the discs (10, 11), each roller assembly comprising a roller (1). The discs (10, 11) are urged together against the interposed roller assemblies by a clamping force. Each roller (1) of each roller assembly contacts each disc (10, 11) at contact points (38, 39); each roller assembly being connected to a corresponding rotatable trunnion (28); each trunnion (28) having a rotational axis which passes through a toroidal cavity formed by the opposing shaped inner faces of the discs (10, 11); wherein by rotating a trunnion (28) about the trunnion rotational axis the trunnion (28) applies a steering force to the corresponding roller assembly at a point relative to the corresponding roller assembly; the applied steering force causing the roller (1) of the corresponding roller assembly to steer and adopt different contact points (38, 39); wherein the point at which the steering force is applied is located offset from the trunnion rotational axis at a fixed distance and also located offset a line which intersects the contact points (38, 39). |
