| 摘要 |
A powershift gearbox 10 comprises two input shafts 14A, 14B which are driven, via two main clutches 62A, 62B, by a prime mover 90. The input shafts 14A, 14B have input gears 22-34 which are fixed to the input shafts 14A, 14B by dog clutches 60A-60D and are meshed with output gears 25-37 permanently fixed to output shaft 16. Power units, e.g. electric motors/generators, hydraulic motors 80A, 80B coupled to input shafts 14A, 14B may be used to provide addition torque when starting/accelerating or they may be used to synchronize dog clutches 60A-60D with input gears 22-34. Alternatively the power units 80A, 80B may be used to provide regenerative braking. In another independent claim the invention relates to magnetically or hydraulically controlling engagement of the dog clutches. For example, magnetic clutching rings (74A, 74B, fig 5) are caused to move axially by a magnetic field created by an electrical current in windings (112A, 112B). Clutching rings (74A, 74B) haves external splines which engage with internal splines in gears 24-32 and the clutching rings (74A, 74B) are moved in either direction by reversal of current in the winding (112A, 112B). |
