| 摘要 |
A variable ratio gear assembly and transmission system. A rotor (10) carried by a piston and cylinder device (13, 15) engages a drive face (9) on a rotatable input shaft (3) and also engages a drive face (27) on a rotatable disc (28). Rotation of the shaft (3) imparts traction or fluid film drive to the rotor (10) which latter imparts traction or fluid film drive to the disc (28). Variation in the ratio of the gear is effected by actuation of the piston and cylinder device (13, 15) to displace the rotor (10) over the drive faces (9) and (27) while maintaining engagement therewith. A further rotor (33) carried by a piston and cylinder device (36, 38) drivingly engages by traction or fluid film drive with opposed drive faces (32 and 43) respectively carried by the disc 28 and an output shaft (45). Displacement of the rotor (33) by actuation of the device (36, 38) varies or further varies the gear ratio. The drive face (9) is urged into engagement with the rotor (10) by a pin and slot device (7) which is responsive to the rotation of shaft (3). The piston and cylinder device (13, 15) (and possibly 36, 38) is pivotally mounted at (26) to the housing (1) so that it can be pivoted and urged into closer engagement with the drive face (27) upon axial displacement of the drive face (9) towards the face (27). Mounted in the drive face (9) is a freely rotatable rotor (50) having a non-driving region (49) which when engaged by the rotor (10) does not transmit drive from the shaft (3) to the rotor (10). Rods (25 and 42) permit manual adjustment of the piston and cylinder devices. The output shaft (45) may be displaceable axially to move its drive face (43) into or out of engagement with the rotor (33). |
