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Drive unit for hybrid vehicle
| Details |
Inventors: Taniguchi, Takao; Tsukamoto, Kazumasa; Wakuta, Satoru; Tsuzuki, Shigeo; Inuzuka, Takeshi; Omote, Kenji;
Assignee: Aisin Aw Co., Ltd. (JP)
Primary Examiner: Olszewski; Robert P.
Assistant Examiner: McClellan; James S.
Attorney, Agent or Firm: Lorusso & Loud
To reduce the axial dimension and size of a drive train for a hybrid vehicle, a rotor is supported within a recess formed in the end face of the a crankshaft and is further supported by the front cover of the torque converter. As a result, compared with drive trains which have a fixed member extending from the motor housing to support the rotor, the axial dimension and size of the drive train are reduced. |
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DETAILED DESCRIPTION In view of the above problems associated with the prior art, an object of the invention is to provide a hybrid vehicle drive train which minimizes the axial dimension of the drive train and the size of the drive train.
To achieve the foregoing object, the invention provides a drive train for a hybrid vehicle including an engine, a motor having a stator and a rotor, and a transmission receiving driving forces from the engine and the motor, wherein the rotor is supported by an output shaft of the engine and an input member of the transmission.
The rotor preferably has a shaft portion on a rotational center thereof, and the shaft portion of the rotor is supported by the output shaft of the engine, with the shaft portion contacting the output shaft over an axially narrow area.
In a preferred embodiment a recess is formed in an end face of the output shaft of the engine, and a convex portion is formed on an outer surface of the shaft portion of the rotor, wherein the shaft portion of the rotor is inserted into the recess, with the convex portion in contact with a wall surface defining the recess.
The transmission preferably includes a fluid transmission unit having a turbine runner, a pump impeller and a cover, with the cover serving as the input member and being arranged so as to cover the turbine runner and the pump impeller, and the rotor being further supported by a portion of the cover.
The fluid transmission unit preferably has a center piece on a rotational center thereof, and the rotor is centered by the center piece.
A flex plate is preferably arranged between the output shaft of the engine and the rotor to transmit driving force.
The flex plate extends to a radially outer side of the stator of the motor, and a sensor detects the extended portion of the flex plate to determine phase of the rotor of the motor.
As shown in FIG.
3, a shaft bushing rotatably supports an end portion of the output shaft of the engine.
A recess is formed in the end of the output shaft, and the rotor has a centered rotor shaft inserted into the recess and the rotor is thereby supported by the output shaft, with at least part of the supported shaft portion of the rotor axially overlapping the shaft bushing
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