Valve device and high pressure pump using the same

Patent metadata

Field	Value
Publication number	US-9850892-B2
Application number	US-201615349148-A
Country	US
Kind code	B2
Filing date	Nov 11, 2016
Priority date	May 12, 2011
Publication date	Dec 26, 2017
Grant date	Dec 26, 2017

Abstract

A valve seat has an inner passage and outer passages. A suction valve member has first passages and a first projection portion that guides, to the first passages, the fuel that flows from a pressure chamber at the time of valve opening. Therefore, an action force by the dynamic pressure applied to the suction valve member in the valve closing direction is reduced. An action force by the pressure of fuel that flows into pressure equalization grooves counterbalances the action force by the dynamic pressure of the suction valve member. Therefore, self-closing by the dynamic pressure can be inhibited, and the maximum output of an electromagnetic driving unit can be reduced. Fuel flow through a passage radially outside the suction valve member and the firs passages. A fluid passage area is securable even when a lift amount of the suction valve member is small.

First claim

What is claimed is:

1. A high-pressure pump, comprising:
a plunger;
a pressure chamber with a volumetric capacity that changes when the plunger moves;
a fuel suction portion having a valve;
a valve body;
a valve seat having an inner hole portion located inward in a radial direction of the valve body and an outer hole portion located outward in a radial direction of the valve body with respect to the inner hole portion;
a valve member that is configured to abut against and move away from the valve seat; and
a driving unit that is configured to inhibit movement of the valve member toward the valve seat, wherein:
the outer hole portion is a hole; and
the driving unit is inserted in the inner hole portion.

2. The high-pressure pump according to claim 1 , wherein a portion of the driving is within the inner hole portion and the portion of the driving unit is rigid.

3. The high-pressure pump according to claim 1 , wherein the driving unit extends through the valve seat from a side opposite the valve member to a same side as the valve member.

4. The valve device according to claim 1 , wherein:
a plurality of first passages are provided in a circumferential direction.

5. The valve device according to claim 1 , wherein:
the valve member forms a plurality of projection portions projecting radially outward to narrow the radially outside passage; and
the projection portions function as guide portion.

6. The valve device according to claim 1 , further comprising:
a stopper that is located oppositely to the valve seat relative to the valve member, forms an inner abutment portion to be able to abut against a radially inner portion of the valve member and an outer abutment portion to be able to abut against a radially outer portion of the valve member, and inhibits movement of the valve member oppositely to the valve seat.

7. The valve device according to claim 6 , wherein:
the stopper has a second passage axially penetrating between the inner abutment portion and the outer abutment portion in a radial direction.

8. The valve device according to claim 6 , further comprising:
a spring that is placed radially inward of the inner abutment portion of the stopper to bias the valve member toward the valve seat.

9. The valve device according to claim 1 , wherein:
the valve member forms a first projection portion projecting oppositely to the valve seat relative to the first passages in a radially outer direction; and
the first projection portion functions as the guide portion.

10. The valve device according to claim 9 , wherein:
a nearer portion of a radially inner wall of the first projection portion to the valve seat is nearer to the first passages.

11. The valve device according to claim 1 , further comprising:
a cover member that is located oppositely to the valve seat relative to the valve member, has a third passage penetrating axially, and forms a second projection portion projecting from radially outward of the first passages toward the valve member, wherein
the second projection portion functions as the guide portion.

12. The valve device according to claim 11 , wherein:
the second projection portion functions as an inhibition portion to inhibit movement of the valve member toward the cover member.

13. The valve device according to claim 11 , wherein:
a top of the second projection portion is located radially inward of the outer passages.

14. The valve device according to claim 11 , further comprising:
a spring that is located between the cover member and the valve member, provided to encircle the first passages and the third passage, and biases the valve member toward the valve seat, wherein:
the spring functions as the guide portion.

15. The valve device according to claim 1 , further comprising:
a cover member that is located oppositely to the valve seat relative to the valve member and has a third passage penetrating axially; and
a spring that is located between the cover member and the valve member, provided to encircle the first passages and the third passage, and biases the valve member toward the valve seat, wherein:
the spring functions as the guide portion.

16. The valve device according to claim 1 , wherein:
one or both of a first wall of the valve member and a second wall of the valve seat that face one another have an annular first pressure equalization groove communicating with the first passages and encircling the inner passage, and
one or both of the first wall and the second wall have an annular second pressure equalization groove communicating with the outer passages and encircling the first pressure equalization groove and the first passages.

17. The valve device according to claim 16 , wherein:
the valve member has the first pressure equalization groove and the second pressure equalization groove.

18. The valve device according to claim 1 , further comprising:
a guide member that permits axial movement of the valve member and inhibits radial movement of the valve member.

19. The valve device according to claim 1 , wherein:
the valve member is formed of a plurality of members laminated with each other.

20. The valve device according to claim 1 , wherein
the valve seat is formed of a plurality of members laminated with each other.

Assignees

• Denso Corp

Inventors

• Kuroyanagi Masatoshi
• Inoue Hiroshi
• Koshimoto Shinichiro

Classifications

• F02M59/466 Primary

  Electrically operated valves, e.g. using electromagnetic or piezoelectric operating means · CPC title

• F16K31/0655

  Lift valves · CPC title

• F16K1/50

  Preventing rotation of valve members · CPC title

• F04B19/22

  of reciprocating-piston type · CPC title

• F02M63/0078

  Valve member details, e.g. special shape, hollow or fuel passages in the valve member · CPC title