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Vehicle drive device
| Details |
Inventors: Tabata, Atsushi; Taga, Yutaka; Ibaraki, Ryuji; Nagano, Shuji; Nakamura, Seiji; Amano, Masaya;
Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota, JP)
Primary Examiner: Marmor; Charles A.
Assistant Examiner: Lewis; Tisha D.
Attorney, Agent or Firm: Oliff & Berridge, PLC
A vehicle drive device is provided having a first source of driving force and a hydraulic transmission, into which power is input from the first source of driving force, arranged axially. A motor that transmits power by an electromagnetic action between a stator and a rotor is arranged between the first source of driving force and the hydraulic transmission. The stator is arranged to be radially distant from the rotational center axis of the hydraulic transmission. A small diameter portion formed to have a smaller outer diameter than an inner diameter of the stator is formed at a motor side of the hydraulic transmission and the hydraulic transmission is arranged with the small diameter portion being inserted axially into the inner periphery of the stator. As a result, the axial length of the vehicle drive device is shortened to thereby provide a small-size, lightweight device. |
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DETAILED DESCRIPTION Under these circumstances, the present invention has been made.
It is an object of the present invention to provide a vehicle drive device constituted and arranged to meet the mechanical demands while realizing overall downsizing of a hydraulic transmission and a motor.
To attain the above object, a first embodiment of the present invention provides a vehicle drive device comprising a motor including a rotating shaft, a hydraulic transmission provided adjacent the motor in a direction of a rotational center axis and having a shell housing a fluid, a first rotating member extending axially in one direction to said shell, integrally coupled to the shell and a rotating member of the motor and rotatably supported by a bearing member while a movement of the first rotating member to the axial direction is being stopped, and a second rotating member extending to the shell in the axial direction and in a direction opposite to a direction of the first rotating member, integrally coupled to the shell and rotatably supported by a bearing member while an axial movement of the second rotating member is being stopped.
According to the first embodiment, one of the rotating members, integral with the shell of the hydraulic transmission, and the rotating member of the motor are coupled to each other, whereas the other rotating member is rotatably supported by the bearing while the axial movement of the rotating member is stopped.
Therefore, the rotating member of the motor is also prevented from moving in the axial direction.
This results in the axial position of the rotor that rotates with the rotating member of the motor being fixed.
As the axial movement of the rotor of the motor is arrested in the above way, the relative position between the rotor and stator of the motor can be accurately maintained compared with the conventional art in which the rotor of the motor is installed to the outer shell of the fluid gearing.
On the other hand, the other rotating member integral with the shell of the hydraulic transmission is rotatably supported by another bearing while axial movement of the other rotating member is allowed
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