초록 ▼

A gearbox comprising two shafts (20, 27) with their axes parallel to one another and at least two pairs of gear wheels each pair comprising a wheel (38) on one of the shafts permanently in mesh with a wheel (45) on the other shaft, the wheels (45) on one of the shafts being connectable to the shaft

A gearbox comprising two shafts (20, 27) with their axes parallel to one another and at least two pairs of gear wheels each pair comprising a wheel (38) on one of the shafts permanently in mesh with a wheel (45) on the other shaft, the wheels (45) on one of the shafts being connectable to the shaft by friction clutches, and actuating means disposed between adjacent friction clutches to selectively engage one or other of them; the actuating means comprising two pressure rings (2) and an adjusting ring (1) disposed between them, adjusting rings (5) for causing relative angular movement between the adjusting ring and pressure rings, and opposed pairs of grooves (21, 22) in the facing surfaces of the adjusting ring and pressure rings. Angular movement of the adjusting ring in one direction relative to the pressure rings causes axial movement of one pressure ring to operate on its adjacent friction clutch, while angular movement of the adjusting ring in the other direction causes axial movement of the other pressure ring to operate on the other friction coupling.

대표청구항 ▼

A gearbox comprising two shafts disposed in a housing with their axes parallel to one another; at least two pairs of gear wheels, each pair comprising a wheel on one of the shafts permanently in mesh with a wheel on the other shaft; the wheels on one of the shafts being connectable to the shaft for

A gearbox comprising two shafts disposed in a housing with their axes parallel to one another; at least two pairs of gear wheels, each pair comprising a wheel on one of the shafts permanently in mesh with a wheel on the other shaft; the wheels on one of the shafts being connectable to the shaft for torque transmission by respective friction clutches; and an actuating means disposed between two adjacent friction clutches for selectively causing engagement thereof, the actuating means comprising: two pressure rings respectively operable axially on the friction clutches by way of thrust bearings, the pressure rings being rotatable and movable axially relative to the associated shaft; an adjusting ring disposed between the pressure rings, the adjusting ring being rotatable and axially fixed relative to the associated shaft; adjusting means for causing relative angular movement, about the shaft axis, between the adjusting ring and the pressure rings; each side of the adjusting ring and the adjacent pressure ring having opposed faces provided with circumferentially extending grooves, arranged as at least three opposed pairs of grooves, including portions of varying depth; and rolling members disposed one in each opposed pair of grooves; the grooves on one side of the adjusting ring and the adjacent pressure ring being arranged so that relative angular movement of the adjusting ring and pressure ring in one direction, from a starting position thereof, causes axial movement of the pressure ring away from the adjusting ring to operate on the adjacent friction clutch, whilst relative angular movement of the rings in the opposite direction from the starting position does not cause said axial movement of the pressure ring; and the grooves on the other side of the adjusting ring and the other pressure ring being arranged so that said relative angular movement in the opposite direction from the starting position causes axial movement of said other pressure ring away from the adjusting ring to operate on the other friction clutch whilst relative movement in the first direction from the starting position does not cause said axial movement of said other pressure ring.