Vehicle drive device

Patent metadata

Field	Value
Publication number	US-11407301-B2
Application number	US-202017294821-A
Country	US
Kind code	B2
Filing date	Jan 17, 2020
Priority date	Jan 17, 2019
Publication date	Aug 9, 2022
Grant date	Aug 9, 2022

Abstract

A first case portion includes an end wall portion disposed on a first axial side with respect to a transmission. A second case portion is disposed on the first axial side with respect to a rotor of a rotary electric machine, and includes a first support portion that supports a rotor shaft and a second support portion disposed on a second axial side with respect to the rotor of the rotary electric machine to support the rotor shaft. The second support portion includes a bearing attachment portion to which a rotor bearing for supporting the rotor shaft is attached, and radially extending portion that extends from bearing attachment portion toward an outer side in a radial direction. A speed reducer is disposed between the radially extending portion and the end wall portion in axial direction to face the radially extending portion and the end wall portion in the axial direction.

First claim

The invention claimed is:

1. A vehicle drive device comprising:
an input member drivingly coupled to an internal combustion engine;
an output member drivingly coupled to wheels;
a transmission provided in a first power transfer path that connects between the input member and the output member to transfer rotation transferred from a side of the input member to a transmission output member with a speed of the rotation varied;
a rotary electric machine capable of transferring a drive force via a second power transfer path to a portion of the first power transfer path on a side of the output member with respect to the transmission output member;
a speed reducer provided in the second power transfer path to transfer rotation transferred from a side of the rotary electric machine to the side of the output member with a speed of the rotation reduced; and
a case, wherein:
the rotary electric machine and the speed reducer are disposed coaxially with the transmission output member on a first axial side, which is one side in an axial direction, with respect to the transmission;
the case includes a first case portion that supports the transmission and the transmission output member, and a second case portion that supports the rotary electric machine;
the first case portion includes an end wall portion disposed on the first axial side with respect to the transmission;
the second case portion includes a first support portion disposed on the first axial side with respect to a rotor of the rotary electric machine to support a rotor shaft that rotates together with the rotor, and a second support portion disposed on a second axial side, which is opposite to the first axial side in the axial direction, with respect to the rotor to support the rotor shaft;
the second support portion includes a bearing attachment portion to which a rotor bearing for supporting the rotor shaft is attached, and a radially extending portion that extends from the bearing attachment portion toward an outer side in a radial direction; and
the speed reducer is disposed between the radially extending portion and the end wall portion in the axial direction to face the radially extending portion and the end wall portion in the axial direction.

2. The vehicle drive device according to claim 1 , wherein one rotary element of the speed reducer is fixed to the second case portion.

3. The vehicle drive device according to claim 1 , wherein:
the transmission output member is rotatably supported by the first case portion via an output member bearing; and
the rotor is rotatably supported by the second case portion via the rotor bearing.

4. The vehicle drive device according to claim 1 , wherein:
a drive force of the rotary electric machine is transferred via the second power transfer path to an intermediate member provided in the first power transfer path;
the speed reducer and the intermediate member are supported by the second case portion;
the intermediate member is disposed coaxially with the transmission output member on the first axial side with respect to the transmission; and
the intermediate member is coupled to the transmission output member from the first axial side with the second case portion joined to the first axial side of the first case portion.

5. The vehicle drive device according to claim 4 , wherein a first coupling portion, which is a coupling portion between the transmission output member and the intermediate member, is disposed at a position on an inner side in the radial direction with respect to the speed reducer and at which the first coupling portion overlaps the speed reducer as viewed in the radial direction along the radial direction.

6. The vehicle drive device according to claim 5 , wherein:
the speed reducer is constituted using a planetary gear mechanism that includes a sun gear coupled to the rotary electric machine, a carrier coupled to the intermediate member, and a ring gear fixed to the second case portion;
the intermediate member includes a tubular portion disposed on an outer side in the radial direction with respect to a first end portion which is an end portion of the transmission output member on the first axial side;
an outer peripheral surface of the first end portion and an inner peripheral surface of the tubular portion are engaged with each other to form the first coupling portion; and
the sun gear is disposed at a position on an outer side in the radial direction with respect to the tubular portion and at which the sun gear overlaps the first coupling portion as viewed in the radial direction.

7. The vehicle drive device according to claim 4 , wherein:
an axial oil path that extends in the axial direction is formed inside at least one of the transmission output member and the intermediate member; and
a supply portion that supplies oil to the axial oil path is provided on the second axial side with respect to the speed reducer.

8. The vehicle drive device according to claim 4 , wherein:
a rotation sensor that detects rotation of the rotary electric machine is provided on the first axial side with respect to the rotary electric machine; and
a second coupling portion, which is a coupling portion between the intermediate member and the output member, is disposed at a position on an inner side in the radial direction with respect to the rotation sensor and at which the second coupling portion overlaps the rotation sensor as viewed in the radial direction along the radial direction.

9. The vehicle drive device according to claim 1 , wherein a joint portion between the first case portion and the second case portion is disposed at a position on an outer side in the radial direction with respect to the speed reducer and at which the joint portion overlaps the speed reducer as viewed in the radial direction along the radial direction.

Assignees

• Aisin Corp

Inventors

• Kato Hiroshi
• Suyama Daiki
• Maeda Takuyo
• Inda Keita
• Ono Kohei
• Mizutani Toshihisa
• Muramatsu Ryosuke
• TAKAKI Wataru
• Kobayashi Tetsuro

Classifications

• F16H57/0476

  Electric machines and gearing, i.e. joint lubrication or cooling or heating thereof · CPC title

• Y02T10/62

  Hybrid vehicles · CPC title

• B60K2006/4833

  Step up or reduction gearing driving generator, e.g. to operate generator in most efficient speed range · CPC title

• H02K9/197

  in which the rotor or stator space is fluid-tight, e.g. to provide for different cooling media for rotor and stator · CPC title

• H02K7/006

  Structural association of a motor or generator with the drive train of a motor vehicle · CPC title