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US 2011/0031086 A1Published application
Torque-transmitting mechanism having a compact piston and spring assembly
AssigneeGM Global Technology Operations LLC
InventorsWilliam S. Reed, Douglas Scott Burchett, Rayman Eton Bazilio
Life of this patent
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Abstract
A transmission includes an input member, an output member, four planetary gear sets, a plurality of coupling members and a plurality of torque-transmitting devices. A hydraulic fluid control circuit is provided for controlling the operation of the plurality of torque-transmitting devices. The hydraulic fluid control circuit receives pressurized hydraulic fluid from an off-axis hydraulic fluid pump and has a plurality of fluid passages disposed in the transmission house, input member and other coupling members.
Claims14
A torque-transmitting mechanism for transmitting torque from a first member to a second member, the torque-transmitting mechanism comprising:
- a housing connectable to the first member, the housing having a piston chamber including an outer wall, an inner wall radially inboard of the outer wall and a ring retainer groove disposed in the outer wall;
- a piston disposed in the piston chamber of the housing, the piston having a base portion and an apply portion wherein the apply portion is a plurality of projections extended from the base portion;
- a plurality of coil springs each having a first and a second end, wherein the first end is in contact with the base portion of the piston;
- a spring retainer having a retainer surface, a plurality of projections and a plurality of slots, wherein each of the plurality of projections retain the second end of each of the plurality of springs and the plurality of slots are formed to receive the plurality of projections of the apply portion of the piston;
- a first ring retainer having an outer portion that is disposed in the groove of the outer wall of the piston chamber and an inner portion in contact with the surface of the spring retainer;
- and
- a plurality of reaction plates disposed in the housing, wherein the reaction plates are rotatably engaged to the housing;
- a plurality of friction plates rotatably engaged to the second member, and
- wherein the piston is actuatable to force the reaction plates against the friction plates to transmit torque from the first member to the second member.
6 more elements
A torque-transmitting mechanism for transmitting torque from a first member to a second member, the torque-transmitting mechanism comprising:
- a housing connectable to the first member, the housing having a splined portion and a piston chamber, wherein the splined portion includes a ring retainer groove and the piston chamber includes an outer wall, an inner wall radially inboard the outer wall and a ring retainer groove disposed in the outer wall;
- a piston disposed in the piston chamber of the housing, the piston having a base portion and an apply portion wherein the apply portion is a plurality of projections extended from the base portion;
- a plurality of coil springs each having a first and a second end, wherein the first end is in contact with the base portion of the piston;
- a spring retainer having a retainer surface, a plurality of projections and a plurality of slots, wherein each of the plurality of projections retain the second end of each of the plurality of coil springs and the plurality of slots are formed to receive the plurality of projections of the apply portion of the piston;
- a first ring retainer having an outer portion that is disposed in the groove of the outer wall of the piston chamber and an inner portion in contact with the surface of the spring retainer;
- a plurality of reaction plates disposed in the housing, wherein the reaction plates are rotatably engaged to the housing;
- a plurality of friction plates rotatably engaged to the second member, and
- a backing plate and a second ring retainer, wherein the backing plate is disposed axially adjacent to the plurality of friction plates and the second ring retainer has an outer portion disposed in the groove of the splined portion of the housing and an inner portion in contact with the backing plate, and
- wherein the piston is actuatable to force the reaction plates against the friction plates to transmit torque from the first member to the second member.
6 more elements
A torque-transmitting mechanism for transmitting torque from a first member to a second member, the torque-transmitting mechanism comprising:
- a housing connectable to the first member, the housing having a splined portion and a piston chamber, wherein the splined portion includes a ring retainer groove and the piston chamber includes an outer wall, an inner wall radially inboard the outer wall and a ring retainer groove disposed in the outer wall;
- a piston disposed in the piston chamber of the housing, the piston having a base portion and an apply portion wherein the apply portion is a plurality of projections extended from the base portion and is partially corrugated;
- a plurality of coil springs each having a first and a second end, wherein the first end is in contact with the base portion of the piston;
- a spring retainer having a retainer surface, a plurality of projections and a plurality of slots, wherein each of the plurality of projections retain the second end of each of the plurality of springs and the plurality of slots include a narrow end and a guide tab disposed at the narrow end and are formed to receive the plurality of projections;
- a first ring retainer having an outer portion that is disposed in the groove of the outer wall of the piston chamber and an inner portion in contact with the surface of the spring retainer;
- a plurality of reaction plates disposed in the housing, wherein the reaction plates are rotatably engaged to the housing;
- a plurality of friction plates rotatably engaged to the second member, and
- a backing plate and a second ring retainer, wherein the backing plate is disposed axially adjacent to the plurality of friction plates and the second ring retainer has an outer portion disposed in the groove of the splined portion of the housing and an inner portion in contact with the backing plate, and
- wherein the piston is actuatable to force the reaction plates against the friction plates to transmit torque from the first member to the second member.
6 more elements
Dependencies are inferred from the claim text.