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US 5,482,512 AGranted
Electro-mechanical hybrid powertrain with self-engaging brakes for starting the engine
AssigneeGeneral Motors Corporation
InventorPaul D. Stevenson
Life of this patent
Estimating the term…
Abstract
An electro-mechanical hybrid powertrain uses the electric motor during engine starting. A planetary gear arrangement is disposed in torque transmitting relation between the prime mover, the electric motor and the transmission output. A pair of brake members, which are self-engaging, are provided to establish reaction members in the planetary gear arrangement during engine starting. A fluid-operated piston selectively enforces disengagement of the brakes after the engine has started.
Claims4
In combination an electro-mechanical hybrid powertrain comprising:
- an input means for supplying power;
- an electric motor/generator;
- planetary gear means disposed between and interconnecting the input means and the motor/generator comprising at least two planetary gear sets including a first member operatively connected with the input means, a second member operatively connected with the motor/generator and a third member;
- and
- brake means for providing a reaction in said planetary gear means for permitting said motor/generator to drive said input means during a starting sequence, said brake means comprising self-energizing means operatively connected with said third member of said planetary gear means for engaging said brake means in response to torque being imposed on one member of the planetary gear means and fluid operated piston means for de-activating said self-energizing means for selectively disengaging said brake means.
2 more elements
Dependencies are inferred from the claim text.