Hydraulic control system for a transmission

Patent metadata

Field	Value
Publication number	US-10077834-B2
Application number	US-201615235183-A
Country	US
Kind code	B2
Filing date	Aug 12, 2016
Priority date	Aug 12, 2016
Publication date	Sep 18, 2018
Grant date	Sep 18, 2018

Abstract

A dual pressure pump system for a transmission includes a dual pressure pump having a first pump outlet and a second pump outlet, and a pressure regulator valve defining a first chamber in fluid communication with the first pump outlet and a second chamber in fluid communication with the second pump outlet. The pressure regulator valve is configured to selectively connect the first chamber with a first pressure line operating at a first greater-than-zero pressure and to selectively connect the second chamber to a second pressure line operating at a second greater-than-zero pressure.

First claim

What is claimed is:

1. A dual pressure pump system for a transmission comprising:
a dual pressure pump having a first pump outlet and a second pump outlet;
a pressure regulator valve defining a first chamber in fluid communication with the first pump outlet and a second chamber in fluid communication with the second pump outlet, wherein the pressure regulator valve is configured to selectively connect the first chamber with a first pressure line operating at a first greater-than-zero pressure and to selectively connect the second chamber to a second pressure line operating at a second greater-than-zero pressure, wherein the pressure regulator valve further comprises:
an elongate housing; and
an axially slidable spool that is axially slidable within the elongate housing to selectively connect the first chamber with the first pressure line operating at the first greater-than-zero pressure and to selectively connect the second chamber to the second pressure line operating at the second greater-than-zero pressure, wherein the first chamber is defined within the elongate housing and between a first land and second land of the axially slidable spool, and wherein the second chamber is defined within the elongate housing and between a third land and a fourth land of the axially slidable spool.

2. The system of claim 1 , wherein the elongate housing further defines a first exhaust port in communication with the first greater-than-zero pressure line, and wherein the position of the axially slidable spool selectively connects the first chamber with the first exhaust port.

3. The system of claim 2 , wherein the elongate housing further defines a second exhaust port in communication with the second greater-than-zero pressure line, and wherein the position of the axially slidable spool selectively connects the second chamber with the second exhaust port.

4. The system of claim 1 , further comprising a ball-check valve selectively connecting the second pump outlet in fluid communication with the first chamber.

5. The system of claim 1 , wherein the pressure regulator valve is configured to selectively connect the first chamber with the second pressure line operating at the second greater-than-zero pressure.

6. The system of claim 1 , wherein the pressure regulator valve is configured to selectively connect the first chamber with a transmission sump.

7. A transmission including a dual pressure pump system comprising:
a dual pressure pump having a first pump outlet and a second pump outlet;
a pressure regulator valve defining a first chamber in fluid communication with the first pump outlet and a second chamber in fluid communication with the second pump outlet, wherein the pressure regulator valve is configured to selectively connect the first chamber with a first pressure line operating at a first greater-than-zero pressure and to selectively connect the second chamber to a second pressure line operating at a second greater-than-zero pressure, wherein the pressure regulator valve further comprises:
an elongate housing; and
an axially slidable spool that is axially slidable within the elongate housing to selectively connect the first chamber with the first pressure line operating at the first greater-than-zero pressure and to selectively connect the second chamber to the second pressure line operating at the second greater-than-zero pressure, wherein the first chamber is defined within the elongate housing and between a first land and second land of the axially slidable spool, and wherein the second chamber is defined within the elongate housing and between a third land and a fourth land of the axially slidable spool.

8. The transmission of claim 7 , wherein the elongate housing further defines a first exhaust port in communication with the first greater-than-zero pressure line, and wherein the position of the axially slidable spool selectively connects the first chamber with the first exhaust port.

9. The transmission of claim 8 , wherein the elongate housing further defines a second exhaust port in communication with the second greater-than-zero pressure line, and wherein the position of the axially slidable spool selectively connects the second chamber with the second exhaust port.

10. The transmission of claim 7 , further comprising a ball-check valve selectively connecting the second pump outlet in fluid communication with the first chamber.

11. The transmission of claim 7 , wherein the pressure regulator valve is configured to selectively connect the first chamber with the second pressure line operating at the second greater-than-zero pressure.

12. The transmission of claim 7 , wherein the pressure regulator valve is configured to selectively connect the first chamber with a transmission sump.

13. A propulsion system for a vehicle comprising:
a dual pressure pump having a first pump outlet and a second pump outlet;
a pressure regulator valve defining a first chamber in fluid communication with the first pump outlet and a second chamber in fluid communication with the second pump outlet, wherein the pressure regulator valve is configured to selectively connect the first chamber with a first pressure line operating at a first greater-than-zero pressure and to selectively connect the second chamber to a second pressure line operating at a second greater-than-zero pressure, wherein the pressure regulator valve further comprises:
an elongate housing; and
an axially slidable spool that is axially slidable within the elongate housing to selectively connect the first chamber with the first pressure line operating at the first greater-than-zero pressure and to selectively connect the second chamber to the second pressure line operating at the second greater-than-zero pressure, wherein the first chamber is defined within the elongate housing and between a first land and second land of the axially slidable spool, and wherein the second chamber is defined within the elongate housing and between a third land and a fourth land of the axially slidable spool.

14. The system of claim 13 , wherein the elongate housing further defines a first exhaust port in communication with the first greater-than-zero pressure line, and wherein the position of the axially slidable spool selectively connects the first chamber with the first exhaust port.

Assignees

• Gm Global Tech Operations Llc

Inventors

• Schultz John C
• Moses Robert L
• Lahr Derek F
• Bai Shushan

Classifications

• F16K11/07

  with cylindrical slides · CPC title

• G05D16/106

  Sleeve-like sensing elements; Sensing elements surrounded by the flow path · CPC title

• F16H61/0025 Primary

  Supply of control fluid; Pumps therefor · CPC title

• F16H61/0009

  Hydraulic control units for transmission control, e.g. assembly of valve plates or valve units · CPC title

• F16K15/04

  shaped as balls · CPC title