| US 7,588,133 B2 | ||
| Clutch control system for power transmission devices | ||
| Aaron Ronk, Lake George, N.Y. (US); John D. Zalewski, Liverpool, N.Y. (US); and James S. Brissenden, Baldwinsville, N.Y. (US) | ||
| Assigned to Magna Powertrain USA, Inc., Troy, Mich. (US) | ||
| Filed on Aug. 21, 2006, as Appl. No. 11/507,315. | ||
| Application 11/507315 is a continuation of application No. 10/931590, filed on Sep. 01, 2004, granted, now 7,097,019. | ||
| Prior Publication US 2006/0278492 A1, Dec. 14, 2006 | ||
| This patent is subject to a terminal disclaimer. | ||
| Int. Cl. F16D 25/12 (2006.01); F15B 7/06 (2006.01) | ||
| U.S. Cl. 192—85C [60/545; 192/84.2; 192/85 R] | 18 Claims |
| 10. A power transmission device comprising:
first and second rotary members;
a friction clutch operably disposed between said first and second rotary members; and
a hydraulic clutch actuation system operable for applying a clutch engagement force to said friction clutch, said hydraulic
clutch actuation system including an actuator having first and second electromagnets operable to translate a piston from a
retracted position to an advanced position and an accumulator for storing pressurized fluid supplied by said actuator, said
piston being fixed to said first electromagnet and operable to supply pressurized fluid to said accumulator for use in actuating
said friction clutch.
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