Hydraulic pressure supply system of automatic transmission for vehicle

Patent metadata

Field	Value
Publication number	US-9316307-B2
Application number	US-201314139821-A
Country	US
Kind code	B2
Filing date	Dec 23, 2013
Priority date	Jul 29, 2013
Publication date	Apr 19, 2016
Grant date	Apr 19, 2016

Abstract

A hydraulic pressure supply system may supply low hydraulic pressure generated at a low-pressure hydraulic pump to a low pressure portion through a low-pressure regulator valve, may supply a portion of the low hydraulic pressure to a high-pressure hydraulic pump, and may supply high hydraulic pressure generated at the high-pressure hydraulic pump to a high pressure portion through a high-pressure regulator valve.

First claim

What is claimed is:

1. A hydraulic pressure supply system of an automatic transmission for a vehicle which generates a low hydraulic pressure and a high hydraulic pressure using oil stored in an oil pan and supplies the low hydraulic pressure and the high hydraulic pressure respectively to a low pressure portion and a high pressure portion, the hydraulic pressure supply system comprising:
a low-pressure hydraulic pump receiving the oil stored in the oil pan through an input line, generating the low hydraulic pressure, and discharging the low hydraulic pressure to a first low-pressure line;
a low-pressure regulator valve connected to the first low-pressure line and regulating the hydraulic pressure of the first low-pressure line to stable low hydraulic pressure and supplying the stable low hydraulic pressure to a second low-pressure line;
a first switch valve selectively connecting the second low-pressure line to a third low-pressure line connected to the low pressure portion;
a first bypass line bypassing the first switch valve and connecting the first low-pressure line with the second low-pressure line;
a high-pressure hydraulic pump connected to the first low-pressure line and increasing the hydraulic pressure supplied through the first low-pressure line to generate the high hydraulic pressure, and discharging the high hydraulic pressure to a high-pressure line connected to the high pressure portion;
a second bypass line bypassing the high-pressure hydraulic pump and connecting the first low-pressure line with the high-pressure line;
a second switch valve disposed on the second bypass line and selectively supplying the hydraulic pressure of the first low-pressure line to the high-pressure line; and
a high-pressure regulator valve disposed on the high-pressure line, regulating the hydraulic pressure supplied from the high-pressure hydraulic pump and the hydraulic pressure selectively supplied through the second switch valve to stable high hydraulic pressure, and supplying the regulated hydraulic pressure to the high pressure portion.

2. The hydraulic pressure supply system of claim 1 , wherein the low-pressure hydraulic pump is a mechanical hydraulic pump driven by an engine, and the high-pressure hydraulic pump is an electric hydraulic pump driven by a motor.

3. The hydraulic pressure supply system of claim 1 , wherein the low-pressure regulator valve regulates the hydraulic pressure of the first low-pressure line to be stable by recirculating a portion of the hydraulic pressure of the first low-pressure line through a first recirculation line, and supplies the regulated hydraulic pressure to the second low-pressure line.

4. The hydraulic pressure supply system of claim 3 , wherein the first recirculation line is connected to the input line.

5. The hydraulic pressure supply system of claim 1 , wherein the low-pressure regulator valve is controlled by control pressure of a first solenoid valve, elastic force of an elastic member, and the hydraulic pressure of the first low-pressure line counteracting against the control pressure and the elastic force.

6. The hydraulic pressure supply system of claim 1 , wherein the first switch valve is controlled by recirculated hydraulic pressure supplied from the high-pressure regulator valve and elastic force of an elastic member counteracting against the recirculated hydraulic pressure.

7. The hydraulic pressure supply system of claim 1 , wherein the high-pressure regulator valve regulates the hydraulic pressure of the high-pressure line to be stable by recirculating a portion of the hydraulic pressure of the high-pressure line through a second recirculation line and a third recirculation line.

8. The hydraulic pressure supply system of claim 7 , wherein the second recirculation line is connected to the first switch valve and the third recirculation line is connected to the third low-pressure line.

9. The hydraulic pressure supply system of claim 1 , wherein the high-pressure regulator valve is controlled by control pressure of a second solenoid valve and elastic force of an elastic member, and the hydraulic pressure of the high-pressure line counteracting against the control pressure and the elastic force.

10. The hydraulic pressure supply system of claim 1 , wherein the second switch valve is controlled by control pressure of a first solenoid valve and elastic force of an elastic member counteracting against the control pressure.

11. The hydraulic pressure supply system of claim 1 , wherein an orifice is mounted on the first bypass line.

12. A hydraulic pressure supply system of an automatic transmission for a vehicle which supplies low hydraulic pressure generated at a low-pressure hydraulic pump to a low pressure portion through a low-pressure regulator valve, supplies a portion of the low hydraulic pressure to a high-pressure hydraulic pump, and supplies high hydraulic pressure generated at the high-pressure hydraulic pump to a high pressure portion through a high-pressure regulator valve, the hydraulic pressure supply system comprising:
a first switch valve disposed on a low-pressure line connecting the low-pressure regulator valve with the low pressure portion, and selectively opening or closing the low-pressure line;
a first bypass line bypassing the first switch valve and connecting the low-pressure regulator valve with the low pressure portion;
a second bypass line bypassing the high-pressure hydraulic pump and connecting the low-pressure hydraulic pump with the high-pressure regulator valve; and
a second switch valve disposed on the second bypass line and selectively opening or closing the second bypass line.

13. The hydraulic pressure supply system of claim 12 , wherein an orifice is mounted on the first bypass line.

14. The hydraulic pressure supply system of claim 12 , wherein the low-pressure regulator valve regulates hydraulic pressure supplied thereto to be stable by recirculating a portion of the hydraulic pressure to the low-pressure hydraulic pump.

15. The hydraulic pressure supply system of claim 12 , wherein the high-pressure regulator valve regulates hydraulic pressure supplied thereto to be stable by supplying a portion of the hydraulic pressure to the first switch valve as control pressure and to the low pressure portion.

16. The hydraulic pressure supply system of claim 12 , wherein the low-pressure regulator valve and the second switch valve receive control pressure from one solenoid valve.

17. The hydraulic pressure supply system of claim 16 , wherein the high-pressure regulator valve receives control pressure from another solenoid valve.

Assignees

• Hyundai Motor Co Ltd

Inventors

• Wi Taehwan
• Hwang Jin Young
• Jo Se Hwan

Classifications

• Y10T137/86139

  Serial · CPC title

• F15B11/17

  using two or more pumps · CPC title

• Y10T137/0379

  By fluid pressure · CPC title

• Y10T137/85954

  Closed circulating system · CPC title

• F16H61/4008 Primary

  Control of circuit pressure · CPC title