Variable pressure pump with hydraulic passage

Patent metadata

Field	Value
Publication number	US-10267310-B2
Application number	US-201515301899-A
Country	US
Kind code	B2
Filing date	Apr 13, 2015
Priority date	Apr 14, 2014
Publication date	Apr 23, 2019
Grant date	Apr 23, 2019

Abstract

A variable capacity pump includes a control ring moveable within a pump chamber to alter the volumetric capacity of the pump. First and second control chambers individually receive pressurized fluid to create forces to bias the control ring in a predetermined direction. A return spring urges the control ring toward a maximum volumetric capacity pump position. The control ring connects and disconnects the second control chamber from a source of pressurized fluid based on a position of the control ring. Forces from the control chambers and the spring act in combination with one another or against one another and against the spring force to establish first and second equilibrium pressures based on a pressurized or vented condition of the second control chamber.

First claim

What is claimed is:

1. A variable capacity pump, comprising:
a pump casing including a pump chamber, an inlet and an outlet;
a pump member movably positioned within the pump chamber, the pump member pumping a fluid from the inlet, through the pump chamber and to the outlet;
a control ring being movable within the pump casing to alter the volumetric capacity of the pump;
first and second control chambers at least partially defined by the pump casing and the control ring, the control chambers operable to individually receive pressurized fluid to create individual forces to bias the control ring toward a first position corresponding to a minimum volumetric capacity of the pump;
a return spring urging the control ring toward a second position corresponding to a maximum volumetric capacity of the pump, a force of the return spring acting against a combined force generated by the pressurized fluid within the control chambers to establish a first equilibrium pressure, wherein the control ring connects and disconnects the second control chamber from a source of the pressurized fluid based on a position of the control ring, the return spring acting against the force of the first control chamber to establish a secondary equilibrium pressure when the second control chamber is disconnected from the source of pressurized fluid.

2. The variable capacity pump of claim 1 , wherein the control ring includes a channel connecting and disconnecting the second control chamber with the source of pressurized fluid based on the position of the control ring.

3. The variable capacity pump of claim 2 , wherein the channel connects and disconnects the second control chamber with a discharge passage, the channel being connected to the discharge passage to reduce the fluid pressure within the second control chamber when the control ring is in a position disconnecting the pressurized fluid source from the second control chamber.

4. The variable capacity pump of claim 3 , wherein the control ring blocks an opening to the discharge passage when the channel connects the pressurized fluid source and the second control chamber.

5. The variable capacity pump of claim 3 , wherein the channel includes a blind recess extending along a surface of the control ring that slides relative to the pump casing.

6. The variable capacity pump of claim 2 , wherein the channel extends across a width of the control ring in a direction perpendicular to a direction that the control ring moves.

7. The variable capacity pump of claim 1 , wherein the pump casing includes a supply passage having a feeding orifice in fluid communication with the pressurized fluid source, the feeding orifice being positioned within the pump chamber and selectively blocked based on the position of the control ring.

8. The variable capacity pump of claim 1 , wherein the pump member is positioned within a cavity of the control ring.

9. The variable capacity pump of claim 8 , wherein the pump member is driven by a rotatable rotor.

10. The variable capacity pump of claim 1 , further including a third control chamber at least partially defined by the control ring and the pump casing and operable to receive pressurized fluid to create a force urging the control ring toward the first position.

11. The variable capacity pump of claim 10 , further including an electrically operated hydraulic solenoid valve to control the supply of pressurized fluid to the third control chamber, the pump outputting fluid according to a high mode pressure curve when the third control chamber is not supplied with pressurized fluid, and a low mode pressure curve when the third control chamber is supplied with pressurized fluid.

12. The variable capacity pump of claim 11 , wherein the electrically operated hydraulic solenoid valve is an on/off type.

13. The variable capacity pump of claim 11 , wherein the electrically operated hydraulic solenoid valve is a proportional type operable to modulate the pressure in the third control chamber between a pump outlet pressure and either atmospheric pressure or a pump inlet pressure.

14. The variable capacity pump of claim 1 , further including an inner rotor and an outer rotor positioned within a cavity of the control ring.

15. The variable capacity pump of claim 14 , wherein the pump member includes a pendulum slide coupled to one of the inner and outer rotors.

16. The variable capacity pump of claim 1 , further including a rotor rotatably positioned within the pump chamber and wherein the pump member includes a plurality of vanes engaging the rotor and the control ring.

17. A variable capacity pump, comprising:
a pump casing including a pump chamber, an inlet and an outlet;
a pump member movably positioned within the pump chamber, the pump member pumping a fluid from the inlet, through the pump chamber and to the outlet;
a control ring being movable within the pump casing to alter the volumetric capacity of the pump;
first and second control chambers at least partially defined by the pump casing and the control ring, the first control chamber operable to receive pressurized fluid to create a force urging the control ring toward a first position corresponding to a minimum volumetric capacity of the pump, the second control chamber operable to receive pressurized fluid to create a force urging the control ring toward a second position corresponding to a maximum volumetric capacity of the pump; and
a return spring urging the control ring toward the second position, a force of the return spring acting against the force generated by the pressurized fluid within the first control chamber to establish a first equilibrium pressure, wherein the control ring connects and disconnects the second control chamber from a source of the pressurized fluid based on a position of the control ring, the return spring force acting with the force generated by the second control chamber and against the force generated by the first control chamber to establish a secondary equilibrium pressure when the second control chamber is connected to the source of pressurized fluid.

18. The variable capacity pump of claim 17 , wherein the control ring includes a channel connecting and disconnecting the second control chamber with the source of pressurized fluid based on the position of the control ring.

19. The variable capacity pump of claim 18 , wherein the channel connects and disconnects the second control chamber with a discharge passage, the channel being connected to the discharge passage to reduce the fluid pressure within the second control chamber when the control ring is in a position disconnecting the pressurized fluid source from the second control chamber.

20. The variable capacity pump of claim 18 , wherein the control ring blocks an opening to the discharge passage when the channel connects the pressurized fluid source and the second control chamber.

21. The variable capacity pump of claim 18 , wherein the channel includes a blind recess extending along a surface of the control ring that slides relative to the pump casing.

22. The variable capacity pump of claim 17 , wherein the pump casing includes a supply passage having a feeding orifice in fluid communication with the pressurized fluid source, the feeding orifice being positioned within the pump chamber and selectively blocked based on the position of the control ring.

23. The variable capacity pump of claim 17 , further including a third control chamber at least partially defined by the contro

Assignees

• Magna Powertrain Usa Inc

Inventors

• Tanasuca Cezar
• Shulver David R
• LAUTH HANS JüRGEN

Classifications

• F04C14/24

  characterised by using valves controlling pressure or flow rate, e.g. discharge valves {or unloading valves}(F04C14/10 takes precedence) · CPC title

• F04C2/344

  with vanes reciprocating with respect to the inner member · CPC title

• F01M2001/0246

  Adjustable pumps · CPC title

• F04C14/226 Primary

  by pivoting the cam around an eccentric axis · CPC title

• F04C2240/30

  Casings or housings · CPC title