| US 7,527,133 B2 | ||
| Power-operated clutch actuator for torque couplings | ||
| Helmuth Sachsenmaier, Graz (Austria); and Todd Ekonen, Howell, Mich. (US) | ||
| Assigned to Magna Powertrain USA, Inc., Troy, Mich. (US) | ||
| Filed on Jul. 19, 2006, as Appl. No. 11/489,218. | ||
| Claims priority of provisional application 60/703282, filed on Jul. 28, 2005. | ||
| Prior Publication US 2007/0023252 A1, Feb. 01, 2007 | ||
| Int. Cl. B60K 23/08 (2006.01); B60K 17/35 (2006.01) | ||
| U.S. Cl. 192—84.6 [192/70.23; 192/84.7; 192/93 A; 180/249] | 27 Claims |
| 27. A power transmission device, comprising:
a rotary input shaft adapted to receive drive torque from a power source;
a rotary output shaft adapted to provide drive torque to an output device;
a friction clutch operably disposed between said rotary input and output shafts;
a clutch actuator for generating and applying a clutch engagement force to said friction clutch, said clutch actuator including
an electric motor, a geared drive unit driven by said electric motor and a clutch operator actuated by said geared drive unit,
said geared drive unit including a worm driven by said electric motor, a compound gear having a worm gear meshed with said
worm and a pinion gear, and a face gear meshed with said pinion gear, said clutch operator including a first cam member, a
second cam member fixed for rotation with said face gear and adapted to move axially in response to rotation relative to said
first cam member for controllably varying the magnitude of said clutch engagement force applied to said friction clutch; and
a control system for actuating said electric motor for causing said geared drive unit to control the direction and amount
of rotation of said face gear.
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