Solenoid valve and oil pump

Patent metadata

Field	Value
Publication number	US-10584803-B2
Application number	US-201715611318-A
Country	US
Kind code	B2
Filing date	Jun 1, 2017
Priority date	Jun 6, 2016
Publication date	Mar 10, 2020
Grant date	Mar 10, 2020

Abstract

A solenoid valve includes: a cylindrical spool that has an annular groove in an outer surface and moves along an axial direction under a driving force generated by a current being applied to a solenoid part; a cylindrical sleeve that has a through-hole capable of communicating with the annular groove and houses the spool; and an urging member that urges the spool by an urging force acting in a direction opposite from a direction in which the driving force is generated. When no current is applied to the solenoid part, a part of the through-hole communicates with the annular groove. When a current is applied to the solenoid part, an area of communication between the through-hole and the annular groove increases as the spool moves under the driving force acting against the urging force.

First claim

What is claimed is:

1. A solenoid valve comprising:
a cylindrical spool that has an annular groove in an outer surface and moves along an axial direction under a driving force generated by a current being applied to a coil;
a cylindrical sleeve that has a through-hole configured to communicate with the annular groove and houses the spool; and
an urging member that urges the spool by an urging force acting in a direction opposite from a direction in which the driving force is generated, wherein:
when no current is applied to the coil, a part of the through-hole communicates with the annular groove; and
when a current is applied to the coil, an area of communication between the through-hole and the annular groove changes only in an increasing direction from the area of communication when no current is applied to the coil as the spool moves under the driving force acting against the urging force.

2. The solenoid valve according to claim 1 , wherein:
the through-hole includes a first opening that has a shape of a long hole extending along a circumferential direction of the sleeve, and a second opening that has a shape of a long hole protruding from the first opening along the axial direction; and
the part of the through-hole is a leading end of the second opening that is located on a side farther from the first opening.

3. The solenoid valve according to claim 2 , wherein the part of the through-hole further includes, separately from the second opening, at least one circular hole that is formed at a portion of the sleeve along the leading end of the second opening in the circumferential direction.

4. The solenoid valve according to claim 2 , wherein the first opening has a triangular shape.

5. The solenoid valve according to claim 2 , wherein the leading end of the second opening has a pointed shape.

6. The solenoid valve according to claim 2 , wherein:
the through-hole further includes, separately from the first opening, a third opening that has a shape of a long hole and is formed at a portion of the sleeve along the first opening in the circumferential direction; and
an annular groove portion that provides communication between the first and second openings and the third opening is provided in the sleeve on an outer side of the through-hole.

7. The solenoid valve according to claim 6 , wherein the third opening has a triangular shape.

8. An oil pump comprising:
a housing that has a communication passage communicating with the through-hole of the solenoid valve according to claim 1 ;
a rotor disposed inside the housing;
an adjustment ring that is disposed on an outer side of the rotor and eccentric to a rotational axis of the rotor;
a second urging member that urges the adjustment ring; and
a pressure chamber to which a working fluid is supplied through the communication passage in a direction against an urging force of the second urging member to change an amount of eccentricity of the adjustment ring, wherein
the housing has a drain hole which has a flow passage area larger than a flow passage area of the part of the through-hole and through which the working fluid is discharged from the pressure chamber.

9. A solenoid valve comprising:
a cylindrical spool that has an annular groove in an outer surface and moves along an axial direction under a driving force generated by a current being applied to a coil;
a cylindrical sleeve that has a through-hole configured to communicate with the annular groove and houses the spool; and
an urging member that urges the spool by an urging force acting in a direction opposite from a direction in which the driving force is generated, wherein:
when no current is applied to the coil, a part of the through-hole communicates with the annular groove,
when a current is applied to the coil, an area of communication between the through-hole and the annular groove increases as the spool moves under the driving force acting against the urging force,
the through-hole includes a first opening that has a shape of a long hole extending along a circumferential direction of the sleeve, and a second opening that has a shape of a long hole protruding from the first opening along the axial direction,
the part of the through-hole is a leading end of the second opening that is located on a side farther from the first opening, and
the part of the through-hole further includes, separately from the second opening, at least one circular hole that is formed at a portion of the sleeve along the leading end of the second opening in the circumferential direction.

10. A solenoid valve comprising:
a cylindrical spool that has an annular groove in an outer surface and moves along an axial direction under a driving force generated by a current being applied to a coil;
a cylindrical sleeve that has a through-hole configured to communicate with the annular groove and houses the spool; and
an urging member that urges the spool by an urging force acting in a direction opposite from a direction in which the driving force is generated, wherein:
when no current is applied to the coil, a part of the through-hole communicates with the annular groove,
when a current is applied to the coil, an area of communication between the through-hole and the annular groove increases as the spool moves under the driving force acting against the urging force,
the through-hole includes a first opening that has a shape of a long hole extending along a circumferential direction of the sleeve, and a second opening that has a shape of a long hole protruding from the first opening along the axial direction,
the part of the through-hole is a leading end of the second opening that is located on a side farther from the first opening,
the through-hole further includes, separately from the first opening, a third opening that has a shape of a long hole and is formed at a portion of the sleeve along the first opening in the circumferential direction, and
an annular groove portion that provides communication between the first and second openings and the third opening is provided in the sleeve on an outer side of the through-hole.

Assignees

• Aisin Seiki
• Toyota Motor Co Ltd

Inventors

• Toyama Daisuke
• Amano Shinya
• Sue Yoshikuni
• Ono Hisashi
• Okazawa Shingo
• Yamamoto Michitaka
• Okanishi Daisuke
• Takagi Noboru
• HOSOGI Takayuki

Classifications

• F16K11/0716

  with fluid passages through the valve member (F16K11/0704, F16K11/0708, F16K11/0712 take precedence) · CPC title

• F16K3/34

  Arrangements for modifying the way in which the rate of flow varies during the actuation of the valve · CPC title

• F04C2210/206

  Oil · CPC title

• F04C14/226

  by pivoting the cam around an eccentric axis · CPC title

• F04C2/102

  the two members rotating simultaneously around their respective axes · CPC title