Variable capacity oil pump

Patent metadata

Field	Value
Publication number	US-10947973-B2
Application number	US-201615749893-A
Country	US
Kind code	B2
Filing date	Jul 14, 2016
Priority date	Aug 10, 2015
Publication date	Mar 16, 2021
Grant date	Mar 16, 2021

Abstract

A variable displacement oil pump includes: a pump constituting section; a movable member; an urging mechanism; a control hydraulic chamber group; a drain mechanism arranged to discharge the oil from a specific one control hydraulic chamber of the control hydraulic chamber group; and a control valve which into which the oil of an upstream side that is discharged from the discharge portion, or the oil from the control hydraulic chamber is introduced as a control hydraulic pressure, which is arranged to supply the oil of the upstream side that is discharged from the discharge portion to the specific one control hydraulic chamber, or to discharge the oil from the specific one control hydraulic chamber by the drain mechanism to regulate the pressure of the specific one control hydraulic chamber.

First claim

The invention claimed is:

1. A variable displacement oil pump comprising:
a pump constituting section arranged to be rotationally driven by an engine, to vary volumes of a plurality of pump chambers, and to discharge an oil sucked from a suction portion, from a discharge portion through an oil filter to an inside of the engine;
a movable member arranged to be moved to vary variation amounts of the volumes of the plurality of the pump chambers;
an urging mechanism provided to have a set load, and arranged to urge the movable member in a direction in which the variation amounts of the volumes of the plurality of the pump chambers are increased;
a control hydraulic chamber group including one or more control hydraulic chamber which is arranged to vary the variation amounts of the volumes of the plurality of the pump chambers, and which includes at least a decrease side control hydraulic chamber arranged to receive the oil discharged from the discharge portion, and thereby to act a force to the movable member in a direction in which the variation amounts of the volumes of the plurality of the pump chambers are decreased;
a drain mechanism arranged to discharge the oil from a specific one control hydraulic chamber of the control hydraulic chamber group; and
a control valve into which the oil of an upstream side of the filter that is discharged from the discharge portion, or the oil from the control hydraulic chamber is introduced as a control hydraulic pressure, which is arranged to supply the oil of the upstream side that is discharged from the discharge portion to the specific one control hydraulic chamber, or to discharge the oil from the specific one control hydraulic chamber by the drain mechanism to regulate the pressure of the specific one control hydraulic chamber.

2. The variable displacement oil pump as claimed in claim 1 , wherein the variable displacement oil pump includes an electrically controlled mechanism arranged to supply or discharge the oil discharged from the discharge portion with respect to the specific one control hydraulic chamber, based on an electric signal.

3. The variable displacement oil pump as claimed in claim 2 , wherein the specific one control hydraulic chamber is an increase side control hydraulic chamber arranged to receive the oil discharged from the discharge portion, and thereby to act a force to the movable member in a direction in which the variation amounts of the volumes of the plurality of the pump chambers are increased; and the electrically controlled mechanism is arranged to switch the supply or the discharge of the oil discharged from the discharge portion with respect to the increase side control hydraulic chamber.

4. A variable displacement oil pump comprising:
a pump constituting section arranged to be rotationally driven by an engine, to vary volumes of a plurality of pump chambers, and to discharge an oil sucked from a suction portion, from a discharge portion through an oil filter to an inside of the engine;
a movable member arranged to be moved to vary variation amounts of the volumes of the plurality of the pump chambers;
an urging mechanism provided to have a set load, and arranged to urge the movable member in a direction in which the variation amounts of the volumes of the plurality of the pump chambers are increased;
a control hydraulic chamber group including one or more control hydraulic chamber which is arranged to vary the variation amounts of the volumes of the plurality of the pump chambers, and which includes at least a decrease side control hydraulic chamber arranged to receive the oil discharged from the discharge portion, and thereby to act a force to the movable member in a direction in which the variation amounts of the volumes of the plurality of the pump chambers are decreased;
a drain mechanism arranged to discharge the oil from a specific one control hydraulic chamber of the control hydraulic chamber group; and
a control valve into which the oil of an upstream side of the filter that is discharged from the discharge portion, or the oil from the control hydraulic chamber is introduced as a control hydraulic pressure, which is arranged to supply the oil of the upstream side that is discharged from the discharge portion to the specific one control hydraulic chamber, or to discharge the oil from the specific one control hydraulic chamber by the drain mechanism to regulate the pressure of the specific one control hydraulic chamber,
wherein the variable displacement oil pump includes an electrically controlled mechanism arranged to supply or discharge the oil discharged from the discharge portion with respect to the specific one control hydraulic chamber, based on an electric signal, and
wherein the electrically controlled mechanism is arranged to regulate the supply or the discharge of the oil discharged from the discharge portion to regulate the pressure within the specific one control hydraulic chamber, and thereby to regulate the hydraulic pressure of a downstream side of the filter which is discharged from the discharge portion to a plurality of set pressures.

5. The variable displacement oil pump as claimed in claim 4 , wherein the specific one control hydraulic chamber is a decrease side control hydraulic chamber.

6. The variable displacement oil pump as claimed in claim 5 , wherein the drain mechanism is provided to the electrically controlled mechanism.

7. The variable displacement oil pump as claimed in claim 5 , wherein the drain mechanism is provided to a pump housing receiving the pump constituting section.

8. The variable displacement oil pump as claimed in claim 5 , wherein the drain mechanism is provided to the control valve.

9. The variable displacement oil pump as claimed in claim 4 , wherein the specific one control chamber is an increase side control hydraulic chamber arranged to receive the oil discharged from the discharge portion, and thereby to act a force to the movable member in a direction where the variation amounts of the volumes of the plurality of the pump chambers are increased.

10. The variable displacement oil pump as claimed in claim 9 , wherein the oil of the downstream side which is discharged from the discharge portion is supplied to the decrease side control hydraulic chamber; the oil of the downstream side which is discharged from the discharge portion is supplied through the decrease side control hydraulic chamber to the increase side control hydraulic chamber; and the electrically controlled mechanism is arranged to regulate the discharge of the oil to the increase side control hydraulic chamber.

11. The variable displacement oil pump as claimed in claim 10 , wherein the oil introduced as the control hydraulic pressure to the control valve is the oil of the upstream side which is discharged from the discharge portion.

12. The variable displacement oil pump as claimed in claim 10 , wherein the oil introduced as the control hydraulic pressure to the control valve is the oil of the decrease side control hydraulic chamber.

13. The variable displacement oil pump as claimed in claim 10 , wherein the oil introduced as the control hydraulic pressure to the control valve is the oil of the increase side control hydraulic chamber.

14. A variable displacement oil pump comprising:
a pump constituting section arranged to be rotationally driven by an engine, to vary volumes of a plurality of pump chambers, and to discharge an oil sucked from a suction portion, from a discharge portion through an oil filter to an inside of the engine;
a movable member arranged to be moved to vary variation amounts of the volumes of the plurality of the pump chamb

Assignees

• Hitachi Automotive Systems Ltd

Inventors

• Naganuma Atsushi
• Ohnishi Hideaki

Classifications

• F04C2210/14

  Lubricant · CPC title

• F04C2240/811

  Actuator for control, e.g. pneumatic, hydraulic, electric · CPC title

• F04C2/3442

  the surfaces of the inner and outer member, forming the working space, being surfaces of revolution · CPC title

• F04C14/22

  by changing the eccentricity between cooperating members · CPC title

• F04C14/28

  Safety arrangements; Monitoring · CPC title