Control valve

Patent metadata

Field	Value
Publication number	US-10865890-B2
Application number	US-201815997783-A
Country	US
Kind code	B2
Filing date	Jun 5, 2018
Priority date	Jun 8, 2017
Publication date	Dec 15, 2020
Grant date	Dec 15, 2020

Abstract

A control valve including: a valve housing including a piston space; and a control piston which is movably arranged in the piston space and sub-divides the piston space into at least a first valve space and a second valve space, the control valve including at least a leakage path which sets a desired leakage between the first valve space and the second valve space. A motor vehicle device including an adjustable rotary pump including an adjusting means, for adjusting a delivery volume of the rotary pump, and the control valve, using which a pressure for adjusting the adjusting means can be governed, the motor vehicle device including a means which presses the control piston into a first position and holds it there, and the at least one other inlet of the control valve is connected to a high-pressure side of the rotary pump when the rotary pump is in operation.

First claim

The invention claimed is:

1. A control valve for an adjustable rotary pump of a motor vehicle, comprising:
a valve housing which comprises a piston space; and
a control piston which is movably arranged in the piston space and sub-divides the piston space into at least a first valve space and a second valve space,
wherein at least one leakage path which sets a desired leakage between the first valve space and the second valve space is provided, and
wherein the control piston sub divides the piston space into at least a third valve space, wherein another leakage between the third valve space and the second valve space and/or between the third valve space and the first valve space is smaller than the desired leakage.

2. The control valve according to claim 1 , further comprising an inlet which feeds into the first valve space in at least a first position of the piston and/or an inlet which feeds into the third valve space in at least a second position of the piston, the second position of the piston may be the same or different than the first position.

3. The control valve according to claim 1 , wherein in order to sub-divide the piston space, an inner wall of the valve housing and an outer wall of the control piston form a respective sealing gap which separates the valve spaces from each other.

4. The control valve according to claim 3 , wherein the leakage path extends through the sealing gap between the first valve space and the second valve space.

5. The control valve according to claim 3 , wherein in order to set the leakage path, the sealing gap between the first valve space and the second valve space is embodied so as to be larger than a sealing gap between the second valve space and the third valve space and/or larger than a sealing gap between the first valve space and the third valve space.

6. The control valve according to claim 1 , wherein the second valve space is connected to an outlet.

7. The control valve according to claim 1 , wherein the leakage path is formed by
a gap between an inner wall of the piston space and an outer wall of the control piston, and/or
a structure in the region of the outer wall of the control piston which separates the first valve space from the second valve space, and/or
a structure on the inner wall of the piston space in a shifting region of the leakage path, and/or
at least one passage opening, in the control piston, which fluidically connects the first valve space to the second valve space, and/or
at least one passage opening, in the valve housing, which fluidically connects the first valve space, and/or the inlet which feeds into the first valve space, to the second valve space and/or the outlet which feeds into the second valve space.

8. The control valve according to claim 1 , wherein the other leakage between the third valve space and the second valve space and/or between the third valve space and the first valve space is a desired leakage via a secondary leakage path defined between the respective valve spaces.

9. The control valve according to claim 1 , wherein the desired leakage via the leakage path is at least 1.5 times larger than the other leakage.

10. The control valve according to claim 8 , wherein the secondary leakage path is formed by
a gap between an inner wall of the piston space and an outer wall of the control piston, and/or
a structure in the region of the outer wall of the control piston which separates the first valve space from the third valve space, and/or
a structure in the region of the outer wall of the control piston which separates the second valve space from the third valve space, and/or
a structure on the inner wall of the piston space in a shifting region of the other leakage path, and/or
at least one passage opening, in the control piston, which fluidically connects the first valve space to the third valve space, and/or
at least one passage opening, in the control piston, which fluidically connects the second valve space to the third valve space, and/or
at least one passage opening, in the valve housing, which fluidically connects the first valve space, and/or the inlet which feeds into the first valve space, to the third valve space and/or the inlet which feeds into the third valve space, and/or
at least one passage opening, in the valve housing, which fluidically connects the second valve space, and/or the outlet which feeds into the second valve space, to the third valve space and/or the inlet which feeds into the third valve space.

11. The control valve according to claim 1 , further comprising a restoring means which acts on the control piston counter to a fluid pressure prevailing in the first valve space.

12. The control valve according to claim 11 , wherein the restoring means is a valve spring.

13. The control valve according to claim 1 , further comprising a restoring means which acts on the control piston counter to a fluid pressure prevailing in the third valve space.

14. The control valve according to claim 1 , wherein the fluid is permanently applied to at least one of the first valve space and the third valve space.

15. The control valve according to claim 1 , wherein the fluid pressure can be selectively applied via a controlling means to at least one of the first valve space and the third valve space.

16. The control valve according to claim 15 , wherein the controlling means is coupled to a superordinate controller in order to either apply pressurised fluid to said at least one of the first valve space and the third valve space or to relieve said at least one of the first valve space and the third valve space of pressure, as a function of control signals of the superordinate controller.

17. The control valve according to claim 16 , wherein the superordinate controller is an engine controller of an engine of the vehicle.

18. A motor vehicle device comprising an adjustable rotary pump which comprises an adjusting means, for adjusting a delivery volume of the rotary pump, and the control valve according to claim 1 , using which a pressure for adjusting the delivery volume can be controlled or governed.

19. The motor vehicle device according to claim 18 , wherein the first valve space of the control valve can be connected to and separated from a high-pressure side of the rotary pump via a controlling means.

20. The motor vehicle device according to claim 18 , wherein the second valve space is permanently connected to a reservoir or a suction side of the rotary pump.

21. The motor vehicle device according to claim 18 , wherein the third valve space of the control valve is permanently connected to a high-pressure side of the rotary pump.

Assignees

• Shw Automotive Gmbh

Inventors

• Peters Sven
• Scheidemann Andreas
• Preisler Lothar

Classifications

• F16K11/07 Primary

  with cylindrical slides · CPC title

• Y10T137/8671

  With annular passage [e.g., spool] · CPC title

• F16K17/105

  using choking or throttling means to control the fluid operation of the main valve · CPC title

• G05D16/166

  using pistons within the main valve · CPC title

• F04B49/08

  Regulating by delivery pressure · CPC title