Power transmission device

Patent metadata

Field	Value
Publication number	US-10041570-B2
Application number	US-201415033937-A
Country	US
Kind code	B2
Filing date	Nov 28, 2014
Priority date	Nov 29, 2013
Publication date	Aug 7, 2018
Grant date	Aug 7, 2018

Abstract

A first planetary gear and a clutch are placed between a second carrier of a second planetary gear and an output shaft in the axial direction. A transmission case has a small diameter tubular portion that rotatably supports an output shaft, an annular wall portion extended radially outward from the small diameter tubular portion, and a large diameter tubular portion extended in the axial direction from the outer periphery of the annular wall portion such that the first planetary gear and the clutch are partially surrounded. A mount is fixed to a vehicle body of a vehicle so as to at least partially overlap the small diameter tubular portion, the annular wall portion, and the large diameter tubular portion as viewed in the radial direction. A parking gear of a parking lock device is coupled to the outer periphery of the second carrier.

First claim

The invention claimed is:

1. A power transmission device including a multi-speed transmission that has a planetary gear and that shifts power transmitted from a driving source of a vehicle to an input member to transmit the shifted power to an output member, a parking lock device having a parking gear and a parking pawl that can be engaged with the parking gear, and a case that accommodates the multi-speed transmission and the parking lock device, wherein
the planetary gear has a carrier that is rotatably supported by a central shaft rotatably supported by the case and that is coupled to the output member such that the carrier rotates together with the output member,
at least one of another planetary gear different from the planetary gear included in the multi-speed transmission and a clutch is placed between the carrier and the output member in an axial direction,
the case has a small diameter tubular portion rotatably supporting the output member, an annular wall portion extended radially outward from the small diameter tubular portion, and a large diameter tubular portion extended in the axial direction from an outer periphery of the annular wall portion such that at least one of at least a part of the other planetary gear and at least a part of the clutch is surrounded,
a vehicle body-side constituent member is fixed to a vehicle body of the vehicle so as to at least partially overlap the small diameter tubular portion, the annular wall portion, and the large diameter tubular portion of the case as viewed in a radial direction of the power transmission device, and
the parking gear is coupled to an outer periphery of the carrier so as to rotate together with the carrier.

2. The power transmission device according to claim 1 , wherein
the carrier includes a first shaft support portion that supports one end of a pinion shaft inserted through a pinion gear of the planetary gear, and a second shaft support portion that is located on the output member side of the first shaft support portion and supports the other end of the pinion shaft, and
the parking gear is coupled to an outer periphery of the second shaft support portion and is coupled to the output member so as to rotate together with the output member.

3. The power transmission device according to claim 2 , wherein
the first shaft support portion is rotatably supported by the central shaft, and
the central shaft is supported by the case via the output member.

4. The power transmission device according to claim 2 , wherein
both the other planetary gear and the clutch are placed between the carrier and the output member in the axial direction, and
the clutch connects and disconnects the carrier to and from any of rotary elements of the other planetary gear.

5. The power transmission device according to claim 2 , wherein
the case has an end wall portion, which is extended downward in the power transmission device from a lower part of the large diameter tubular portion and to which an oil pan that stores hydraulic oil is fixed,
the parking lock device includes a parking rod that can advance and withdraw with respect to the parking pawl, and a tubular cam member that causes the parking pawl to mesh with the parking gear according to the advancing and withdrawing movement of the parking rod,
the parking pawl, the parking rod, and the cam member are placed below the parking gear in the power transmission device so as to overlap the end wall portion as viewed in the axial direction of the power transmission device, and
the vehicle body-side constituent member is placed so as to face the parking pawl, the parking rod, and the cam member in the axial direction with the end wall portion interposed therebetween.

6. The power transmission device according to claim 2 , wherein
the vehicle body-side constituent member is a mount that is interposed between the case of the multi-speed transmission and the vehicle body to absorb vibration.

7. The power transmission device according to claim 3 , wherein
both the other planetary gear and the clutch are placed between the carrier and the output member in the axial direction, and
the clutch connects and disconnects the carrier to and from any of rotary elements of the other planetary gear.

8. The power transmission device according to claim 3 , wherein
the case has an end wall portion, which is extended downward in the power transmission device from a lower part of the large diameter tubular portion and to which an oil pan that stores hydraulic oil is fixed,
the parking lock device includes a parking rod that can advance and withdraw with respect to the parking pawl, and a tubular cam member that causes the parking pawl to mesh with the parking gear according to the advancing and withdrawing movement of the parking rod,
the parking pawl, the parking rod, and the cam member are placed below the parking gear in the power transmission device so as to overlap the end wall portion as viewed in the axial direction of the power transmission device, and
the vehicle body-side constituent member is placed so as to face the parking pawl, the parking rod, and the cam member in the axial direction with the end wall portion interposed therebetween.

9. The power transmission device according to claim 7 , wherein
the clutch includes a clutch drum and a friction engagement plate having an outer periphery fitted in a tubular portion of the clutch drum, and can couple one rotary element of the planetary gear to one rotary element of the other planetary gear,
the clutch drum has an annular portion that is coupled to the output member such that the annular portion rotates together with the output member, and the tubular portion that is extended in the axial direction from an outer periphery of the annular portion and that is coupled to the parking gear such that the tubular portion rotates together with the parking gear,
the other planetary gear is placed between the planetary gear and the clutch in the axial direction and is surrounded by the tubular portion of the clutch drum, and
the large diameter tubular portion of the case surrounds the clutch.

10. The power transmission device according to claim 7 , wherein
the case has an end wall portion, which is extended downward in the power transmission device from a lower part of the large diameter tubular portion and to which an oil pan that stores hydraulic oil is fixed,
the parking lock device includes a parking rod that can advance and withdraw with respect to the parking pawl, and a tubular cam member that causes the parking pawl to mesh with the parking gear according to the advancing and withdrawing movement of the parking rod,
the parking pawl, the parking rod, and the cam member are placed below the parking gear in the power transmission device so as to overlap the end wall portion as viewed in the axial direction of the power transmission device, and
the vehicle body-side constituent member is placed so as to face the parking pawl, the parking rod, and the cam member in the axial direction with the end wall portion interposed therebetween.

11. The power transmission device according to claim 9 , wherein
the case has an end wall portion, which is extended downward in the power transmission device from a lower part of the large diameter tubular portion and to which an oil pan that stores hydraulic oil is fixed,
the parking lock device includes a parking rod that can advance and withdraw with respect to the parking pawl, and a tubular cam member that causes the parking pawl to mesh with the parking gear according to the advancing and withdrawing movement of the parking rod,
the parking pawl, the parking rod, and the cam member are placed

Assignees

• Aisin Aw Co

Inventors

• Iwase Mikio
• Todo Minoru
• Yoshikawa Hiroshi
• Jinnai Naoya
• Sada Natsuki
• Nakajima Takuya

Classifications

• F16H3/663 Primary

  with conveying rotary motion between axially spaced orbital gears, e.g. a stepped orbital gear or Ravigneaux · CPC title

• F16H2200/2023

  using a Ravigneaux set with 4 connections · CPC title

• F16H2200/201

  with three sets of orbital gears · CPC title

• F16H57/025

  Support of gearboxes, e.g. torque arms, or attachment to other devices · CPC title

• F16H2200/2046

  with six engaging means · CPC title