Power transmission device

Patent metadata

Field	Value
Publication number	US-9982773-B2
Application number	US-201415034038-A
Country	US
Kind code	B2
Filing date	Nov 27, 2014
Priority date	Nov 29, 2013
Publication date	May 29, 2018
Grant date	May 29, 2018

Abstract

A power transmission device that includes a transmission including a plurality of engagement elements for transmitting power from a motor to axles; a case to accommodate the transmission; a hydraulic control device to control hydraulic pressure to the engagement elements; a hydraulic oil reservoir that stores hydraulic oil; and a first pump that is operated by the power from the motor and that suctions the hydraulic oil from the hydraulic oil reservoir through a strainer and supplies the hydraulic oil to the hydraulic control device.

First claim

The invention claimed is:

1. A power transmission device that is mounted on a vehicle, the power transmission device comprising:
a transmission including a plurality of engagement elements for transmitting power from a motor to axles;
a case to accommodate the transmission;
a hydraulic control device to control hydraulic pressure to the engagement elements;
a hydraulic oil reservoir that stores hydraulic oil; and
a first pump that is operated by the power from the motor and that suctions the hydraulic oil from the hydraulic oil reservoir through a strainer and supplies the hydraulic oil to the hydraulic control device, wherein
the hydraulic control device includes:
a second pump that is operated by receiving supply of electric power and that suctions the hydraulic oil and supplies the hydraulic oil to a starting engagement element among the engagement elements that is engaged to start the vehicle;
a discharge port that discharges the hydraulic oil from the first pump;
a mounting port for the strainer that communicates with the first pump and to which the strainer is mounted;
a first oil passage that communicates the mounting port for the strainer with the first pump; and
a second oil passage that communicates the first oil passage with the second pump, and

an input/output port group composed of a suction port of the second pump, the mounting port for the strainer, and the discharge port, which are arranged side by side in this order.

2. The power transmission device according to claim 1 , wherein
the second pump includes an electromagnetic unit and a pump unit, and
the second pump is placed such that the suction port of the pump unit is oriented toward the mounting port for the strainer.

3. The power transmission device according to claim 2 , wherein
the input/output port group is arranged in a row in a direction orthogonal to a direction of mounting the hydraulic control device to a case member of the transmission, and also orthogonal to an axial direction of the transmission.

4. The power transmission device according to claim 3 , wherein
the hydraulic control device includes a pressure regulator valve that regulates pressure of the hydraulic oil discharged from the first pump, and
the input/output port group is arranged in parallel with the pressure regulator valve.

5. The power transmission device according to claim 4 , wherein
the hydraulic control device further includes a plurality of control valves that control the hydraulic pressure, and
the input/output port group is arranged on one side of the pressure regulator valve in the axial direction of the transmission while the control valves are arranged on the other side of the pressure regulator valve in the axial direction of the transmission.

6. The power transmission device according to claim 5 , wherein
the input/output port group is arranged on a side closer to an internal combustion engine than the control valves are in the axial direction of the transmission.

7. The power transmission device according to claim 1 , wherein
the input/output port group is arranged in a row in a direction orthogonal to a direction of mounting the hydraulic control device to a case member of the transmission, and also orthogonal to an axial direction of the transmission.

8. The power transmission device according to claim 1 , wherein
the hydraulic control device includes a pressure regulator valve that regulates pressure of the hydraulic oil discharged from the first pump, and
the input/output port group is arranged in parallel with the pressure regulator valve.

9. A power transmission device that is mounted on a vehicle, the power transmission device comprising:
a transmission including a plurality of engagement elements for transmitting power from a motor to axles;
a case to accommodate the transmission;
a hydraulic control device to control hydraulic pressure to the engagement elements;
a hydraulic oil reservoir that stores hydraulic oil; and
a first pump that is operated by the power from the motor and that suctions the hydraulic oil from the hydraulic oil reservoir through a strainer and supplies the hydraulic oil to the hydraulic control device, wherein
the hydraulic control device includes:
a second pump that is operated by receiving supply of electric power and that suctions the hydraulic oil and supplies the hydraulic oil to a starting engagement element among the engagement elements that is engaged to start the vehicle;
a discharge port that discharges the hydraulic oil from the first pump;
a mounting port for the strainer that communicates with the first pump and to which the strainer is mounted;
a first oil passage that communicates the mounting port for the strainer with the first pump;
a second oil passage that communicates the first oil passage with the second pump; and
a plurality of control valves that control the hydraulic pressure, and

a suction port of the second pump and the mounting port for the strainer are arranged side by side in this order in a direction orthogonal to a direction of mounting the hydraulic control device to a case member of the transmission, and also orthogonal to an axial direction of the transmission, and
the suction port of the second pump and the mounting port for the strainer are arranged on a side closer to an internal combustion engine than the control valves are in the axial direction of the transmission.

10. A power transmission device that is mounted on a vehicle, the power transmission device comprising:
a transmission including a plurality of engagement elements for transmitting power from a motor to axles;
a case to accommodate the transmission;
a hydraulic control device to control hydraulic pressure to the engagement elements;
a hydraulic oil reservoir that stores hydraulic oil;
a first pump that is operated by the power from the motor and that suctions the hydraulic oil from the hydraulic oil reservoir through a strainer and supplies the hydraulic oil to the hydraulic control device;
a second pump that is operated by receiving supply of electric power and that suctions the hydraulic oil and supplies the hydraulic oil to a starting engagement element among the engagement elements that is engaged to start the vehicle;
a first oil passage that communicates an outlet port of the strainer with the first pump; and
a second oil passage that communicates the first oil passage with the second pump, wherein
the second pump includes an electromagnetic unit and a pump unit, and is mounted on a valve body of the hydraulic control device such that the pump unit is placed between the electromagnetic unit and the outlet port of the strainer.

11. The power transmission device according to claim 10 , wherein
the second oil passage does not overlap the electromagnetic unit when viewed from a vehicle up-down direction.

12. The power transmission device according to claim 11 , wherein
the second oil passage is provided upright in parallel with the vehicle up-down direction.

13. The power transmission device according to claim 12 , wherein
the first oil passage includes a body-side oil passage that is formed in the valve body and communicates with the strainer, and also includes a case-side oil passage that is formed in the case and communicates the body-side oil passage with the first pump;
the second oil passage is formed in the valve body and communicates the case-side oil passage with the second pump; and
the second pump is mounted on the valve body at a location closer to the case-side oil passage than all valves of the hydraulic control device are.

14. The power transmissi

Assignees

• Aisin Aw Co

Inventors

• Tsuchida Kenichi
• Hyodo Yoshimitsu
• Yoshioka Yuhei
• Miyamoto Nobuhiko
• Hasama Mitsuhiro

Classifications

• F16H2200/2046

  with six engaging means · CPC title

• F16H57/0446

  the supply forming part of the transmission control unit, e.g. for automatic transmissions · CPC title

• F16H57/0441

  Arrangements of pumps · CPC title

• F16H3/66

  composed of a number of gear trains without drive passing from one train to another · CPC title

• F16H57/0435

  Pressure control for supplying lubricant; Circuits or valves therefor · CPC title