Clutch-brake assembly

An apparatus for transmitting force to rotate a shaft and for transmitting force to retain the shaft against rotation, said apparatus comprising a base member having a central opening which receives the shaft, a clutch surface which is disposed adjacent to said base member and is movable relative to said base member, said clutch surface being connectable with a source of driving force to be transmitted to the shaft, a brake surface which is disposed adjacent to said base member and is movable relative to said base member, said brake surface being connectable with a stationary member, a piston which is connected with said base member and is movable in first and second directions relative to said base member, said piston being movable in the first direction to press a first friction surface against said clutch surface to transmit force between said clutch surface and said base member, said piston being movable in the second direction to press a second friction surface against said brake surface to transmit force between said brake surface and said base member, and a seal assembly cooperating with said base member and shaft to at least partially define a path along which fluid under pressure is conducted, said seal assembly includes a retaining section and an actuator which is movable relative to said retaining section to press said retaining section against at least a surface on one of said shaft and base member to retard movement of said seal assembly relative to at least said one of said shaft and base member.

An apparatus for transmitting force to rotate a shaft and for transmitting force to retain the shaft against rotation, said apparatus comprising a base member having a central opening which receives the shaft, a clutch surface which is disposed adjacent to said base member and is movable relative to said base member, said clutch surface being connectable with a source of driving force to be transmitted to the shaft, a brake surface which is disposed adjacent to said base member and is movable relative to said base member, said brake surface being connectable with a stationary member, a piston which is connected with said base member and is movable in first and second directions relative to said base member, said piston being movable in the first direction under the influence of fluid pressure applied to said piston to press a first friction surface against said clutch surface to transmit force between said clutch surface and said base member, said piston being movable in the second direction to press a second friction surface against said brake surface to transmit force between said brake surface and said base member, a plurality of springs which urge said piston to move in one of said first and second directions relative to said base member, and a plurality of force transmission members which extend between said piston and said base member and transmit force between said piston and said base member, each of said force transmission members extends around and at least partially encloses one of said springs of said plurality of springs.

An apparatus for transmitting force to rotate a shaft and for transmitting force to retain the shaft against rotation, said apparatus comprising a base member having a central opening which receives the shaft, a clutch surface which is disposed adjacent to said base member and is movable relative to said base member, said clutch surface being connectable with a source of driving force to be transmitted to the shaft, a brake surface which is disposed adjacent to said base member and is movable relative to said base member, said brake surface being connectable with a stationary member, a piston which is connected with said base member and is movable in first and second directions relative to said base member, said piston being movable in the first direction to press a first friction surface against said clutch surface to transmit force between said clutch surface and said base member, said piston being movable in the second direction to press a second friction surface against said brake surface to transmit force between said brake surface and said base member, a retainer assembly disposed in the central opening in said base member, said retainer assembly includes a first actuator which is operable to actuate said retainer assembly to retain said base member and shaft against relative movement, and a seal assembly disposed in the central opening in said base member, said seal assembly includes a second actuator which is operable to actuate said seal assembly to retain said seal assembly in a desired position relative to said base member and shaft.

An apparatus for transmitting force to rotate a shaft and for transmitting force to retain the shaft against rotation, said apparatus comprising a base member having a central opening which receives the shaft, a clutch surface which is disposed adjacent to said base member and is movable relative to said base member, said clutch surface being connectable with a source of driving force to be transmitted to the shaft, a brake surface which is disposed adjacent to said base member and is movable relative to said base member, said brake surface being connectable with a stationary member, a piston which is connected with said base member and is movable in first and second directions relative to said base member, said piston being movable in the first direction to press a first friction surface against said clutch surface to transmit force between said clutch surface and said base member, said piston being movable in the second direction to press a second friction surface against said brake surface to transmit force between said brake surface and said base member, a plurality of force transmission members which extend between said piston and said base member and transmit force between said piston and said base member when said first friction surface is pressed against said clutch surface, and a plurality of bodies of material having a modulus of elasticity which is less than a modulus of elasticity of said force transmission members, a modulus of elasticity of said base member, and a modulus of elasticity of said piston, said bodies of material being disposed between said force transmission members and at least one of said piston and said base member.

An apparatus for transmitting force to rotate a shaft and for transmitting force to retain the shaft against rotation, said apparatus comprising a base member having a central opening which receives the shaft, a clutch surface which is disposed adjacent to said base member and is movable relative to said base member, said clutch surface being connectable with a source of driving force to be transmitted to the shaft, a brake surface which is disposed adjacent to said base member and is movable relative to said base member, said brake surface being connectable with a stationary member, a piston which is connected with said base member and is movable in first and second directions relative to said base member, said piston being movable in the first direction to press a first friction surface against said clutch surface to transmit force between said clutch surface and said base member, said piston being movable in the second direction to press a second friction surface against said brake surface to transmit force between said brake surface and said base member, a plurality of force transmission members which extend between said piston and said base member and transmit force between said piston and said base member when said first friction surface is pressed against said clutch surface, and a plurality of resilient members formed of polymeric material, each of said resilient members at least partially encloses one of said force transmission members and is disposed between said one of said force transmission members and at least one of said piston and said base member.

An apparatus for transmitting force to rotate a shaft and for transmitting force to retain the shaft against rotation, said apparatus comprising a base member having a central opening which receives the shaft, a clutch surface which is disposed adjacent to said base member and is movable relative to said base member, said clutch surface being connectable with a source of driving force to be transmitted to the shaft, a brake surface which is disposed adjacent to said base member and is movable relative to said base member, said brake surface being connectable with a stationary member, a piston which is connected with said base member and is movable in first and second directions relative to said base member, said piston being movable in the first direction to press a first friction surface against said clutch surface to transmit force between said clutch surface and said base member, said piston being movable in the second direction to press a second friction surface against said brake surface to transmit force between said brake surface and said base member, a retainer assembly disposed in the central opening in said base member to retain said base member and shaft against relative movement, a seal assembly disposed in the central opening in said base member, a plurality of springs which urge said piston to move in one of said first and second directions relative to said base member, and a plurality of force transmission members which transmit force between said piston and base member when said first friction surface is pressed against said clutch surface, each of said force transmission members extends around and at least partially encloses one of said springs of said plurality of springs.

An apparatus for transmitting force to rotate a shaft and for transmitting force to retain the shaft against rotation, said apparatus comprising a base member having a central opening which receives the shaft, a clutch surface which is disposed adjacent to said base member and is movable relative to said base member, said clutch surface being connectable with a source of driving force to be transmitted to the shaft, a brake surface which is disposed adjacent to said base member and is movable relative to said base member, said brake surface being connectable with a stationary member, a piston which is connected with said base member and is movable in first and second directions relative to said base member, said piston being movable in the first direction to press a first friction surface against said clutch surface to transmit force between said clutch surface and said base member, said piston being movable in the second direction to press a second friction surface against said brake surface to transmit force between said brake surface and said base member, a retainer assembly disposed in the central opening in said base member to retain said base member and shaft against relative movement, and a seal assembly disposed in the central opening in said base member, said seal assembly includes a passage through which fluid is conducted during movement of said piston in at least one of said first and second directions.