TRANSMISSION SYSTEM AND METHOD FOR PERFORMING A GEARSHIFT

摘要

A transmission system including a selector assembly (27,29,31) arranged to select between gear ratios instantaneously without substantial power interruption, said selector assembly (27) including first and second sets of engagement members (35,36) and an actuator system (38) having a first actuator member (48) for moving the first set of engagement members (35), a second actuator member (58) for moving the second set of engagement members (36), a first actuator device (46) for actuating the first actuator member (48) and a second actuator device (64) for actuating the second actuator member (58) independently of the first actuator device (46). A method for performing a gearshift in a transmission system having first and second gear elements (17,21) rotatably mounted on a first shaft (3), a first gear selector assembly (29) for selectively locking the first gear wheel (17) for rotation with the first shaft (3) and a second gear selector assembly (31) for selectively locking the second gear wheel (21) for rotation with the first shaft (3), wherein each gear selector assembly (29,31) includes first and second sets of engagement members (35,36) and an actuator system (38) for actuating the first and second sets of engagement members (35,36) for locking its respective gear wheel (17,21 ) for rotation the first shaft (3) from the following operational modes: lock the gear element (17,21) for rotation with the first shaft (3) in the clockwise and anti-clockwise directions; lock the gear element (17,21) for rotation with the first shaft (3) in a clockwise direction and unlocked in an anti-clockwise direction; lock the gear element (17,21) for rotation with the first shaft (3) in the anti-clockwise direction and unlocked in the clockwise direction, and a control system (90) for controlling operation of the transmission system, including disengaging the unloaded set of engagement members (35,36) from the currently engaged gear element ( 17,21 ) prior to selecting the new gear element (17,21) with the other gear selector assembly (29,31).