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US 7,201,266 B2Granted
Hydraulic clutch actuation system
AssigneeMagna Powertrain USA, Inc.
InventorsJames S. Brissenden, Timothy M. Burns, Sankar K. Mohan, Eric A. Bansbach, Steven W. O'Hara
Life of this patent
Estimating the term…
Abstract
A torque transfer mechanism for controlling the magnitude of a clutch engagement force exerted on a clutch pack that is operably disposed between a first rotary member and a second rotary member includes a hydraulic clutch actuation system. The hydraulic clutch actuation system includes a primary fluid circuit coupled to a secondary fluid circuit by a pressure intensifier. The pressure intensifier provides magnified pressure to a piston for actuating the clutch pack.
Claims22
A power transmission device, comprising:
- first and second rotary members;
- a clutch disposed between said first and second members;
- a clutch operator moveable between a first position whereat said clutch is released and a second position whereat said clutch is engaged;
- and
- a hydraulic clutch actuation system operable for moving said clutch operator between its first and second positions and including a pressure intensifier, a primary fluid circuit supplying a first fluid to a low pressure inlet of said pressure intensifier, a secondary fluid circuit supplying a second fluid from a high pressure outlet of said pressure intensifier to said clutch operator, a control valve associated with one of said primary and secondary fluid circuits and a control unit for controlling actuation of said control valve.
2 more elements
A power transmission device comprising:
- a first rotary member;
- a second rotary member;
- a torque transfer mechanism operable for transferring drive torque between said first and second rotary members, said torque transfer mechanism including a clutch assembly operably disposed between said first and second rotary members and a hydraulic clutch actuation system, said hydraulic clutch actuation system including a pressure intensifier, a primary fluid circuit and a secondary fluid circuit, said primary fluid circuit having a pressure source for supplying a first fluid to said pressure intensifier, said secondary fluid circuit supplying a second fluid from said pressure intensifier to a pressure chamber for causing a clutch operator to engage said clutch assembly;
- and
- a control unit for controlling actuation of a first control valve in said primary fluid circuit and a second control valve in said secondary fluid circuit for regulating the fluid pressure supplied to said pressure chamber.
2 more elements
A power transmission device for use in a motor vehicle having a powertrain and first and second drivelines, comprising:
- a first shaft driven by the powertrain and adapted for connection to the first driveline;
- a second shaft adapted for connection to the second driveline;
- a mode clutch operably disposed between said first and second shafts;
- and
- a hydraulic clutch actuation system operable for controlling engagement of said mode clutch, said hydraulic clutch actuation system including a fluid pressure source for supplying a first fluid to a pressure intensifier, said pressure intensifier operable for supplying a second fluid at a greater fluid pressure to a moveable clutch operator to release and engage said mode clutch.
2 more elements
A power transmission device comprising:
- a rotary input member adapted to receive drive torque from a source of torque;
- a rotary output member adapted to provide drive torque to an output device;
- a friction clutch operable for transferring drive torque from said input member to said output member;
- and
- a hydraulic clutch actuation system operable for selectively engaging said friction clutch, said hydraulic clutch actuation system including a primary fluid circuit and a secondary fluid circuit interconnected by a pressure intensifier, said secondary fluid circuit is operable in a first mode to engage said friction clutch and a second mode to release said friction clutch.
2 more elements
A transfer case comprising:
- an input shaft driven by a source of drive torque;
- a gearset having a first component driven by said input shaft and a second component driven at a reduced speed relative to said input shaft;
- a first output shaft adapted to provide drive torque to a first driveline;
- a second output shaft adapted to provide drive torque to a second driveline;
- a range clutch having a range operator moveable between a first position and a second position for coupling said first output shaft for rotation with one of said input shaft and said second component of said gearset;
- and
- a hydraulic clutch actuation system for controlling actuation of said range clutch, said hydraulic clutch actuation system including a primary fluid circuit providing low pressure fluid to an inlet of a pressure intensifier, a secondary fluid circuit providing high pressure fluid from an outlet of said pressure intensifier to said range operator, and a control valve for controlling the supply of said high pressure fluid to said range operator.
4 more elements
Dependencies are inferred from the claim text.