The invention provides a gearing assembly (5) comprising a rotary input member (1 b), a rotary output member (3) and a gearing arrangement (52) between the input member and the output member selectively engageable to effect a driving engagement between the input member and the output member through at least a first torque connection having a first gear ratio and a second torque connection having a second gear ratio. One of the rotary input member and the rotary output member comprises a first shaft and the first torque connection comprises a first dog clutch comprising a dog hub (51 ) comprising a hub set of teeth (51 a) and a surrounding dog ring (53) comprising a ring set of teeth (53a), the hub and ring sets of teeth being radially projecting and mutually engageable, the dog hub being mounted on the first shaft so as to allow axial movement of the dog hub relative to the shaft and dog ring with rotation of the dog hub relative to the shaft being resisted such that when the dog hub is axially aligned with the dog ring, the hub and ring sets of teeth engage and rotational drive may be transferred between the first shaft and the dog ring. The hub and ring sets of teeth are dimensioned and spaced so that upon axial movement between the dog hub and the dog ring with the sets of teeth appropriately in register with one another, the teeth in each set may pass through spacings between the teeth in the respective other set, so that the dog hub is moveable between a first disengaged position with the hub set of teeth axially spaced in a first direction from the ring set of teeth, a first engaged position with the hub set of teeth aligned and engaged with the ring set of teeth, and a second disengaged position with the hub set of teeth axially spaced in a second direction from the ring set of teeth.
Gearing assemblies and apparatus
2020-07-16
Patent
Elektronische Ressource
Englisch