High pressure pump

Patent metadata

Field	Value
Publication number	US-9771928-B2
Application number	US-201414284823-A
Country	US
Kind code	B2
Filing date	May 22, 2014
Priority date	May 24, 2013
Publication date	Sep 26, 2017
Grant date	Sep 26, 2017

Abstract

A valve seat member which partitions between a supply passage and a pressurizing chamber, includes an inner flow path, which communicates between the supply passage and the pressurizing chamber, and an outer flow path, which is placed on a radially outer side of the inner flow path. An inner valve is seatable against inner valve seat formed in an opening of the inner flow path. An outer valve is contactable with an end surface of the inner valve, which is opposite from the inner valve seat. The outer valve is seatable against an outer valve seat, which is formed in an opening of the outer flow path.

First claim

What is claimed is:

1. A high pressure pump comprising:
a plunger that is reciprocatable;
a pump body that includes:
a pressurizing chamber, in which fuel is pressurized through reciprocation of the plunger; and
a supply passage, which supplies the fuel to the pressurizing chamber;

a valve seat member that partitions between the supply passage and the pressurizing chamber, wherein the valve seat member includes:
an inner flow path, which communicates between the supply passage and the pressurizing chamber; and
an outer flow path, which is placed on a radially outer side of the inner flow path and communicates between the supply passage and the pressurizing chamber;

an inner valve that is seatable and is liftable relative to an inner valve seat, which is formed in an opening of the inner flow path;
an outer valve that is contactable with an end surface of the inner valve, which is opposite from the inner valve seat, wherein the outer valve is seatable and is liftable relative to an outer valve seat, which is formed in an opening of the outer flow path, and the outer valve is formed separately from the inner valve and is movable relative to the inner valve;
a rod that is received through the inner flow path of the valve seat member and controls movement of the inner valve and movement of the outer valve; and
at least one movement limiting device that limits a lift amount of the inner valve from the inner valve seat and a lift amount of the outer valve from the outer valve seat.

2. The high pressure pump according to claim 1 , wherein when the inner valve and the outer valve are seated against the inner valve seat and the outer valve seat, respectively, a gap is formed between the outer valve and the inner valve.

3. The high pressure pump according to claim 1 , wherein:
the inner valve includes:
an inner valve main body, which closes the inner flow path when the inner valve main body is seated against the inner valve seat; and
a plurality of inner arm portions, which radially outwardly extend from the inner valve main body and are contactable with the outer valve; and

a flow path, which conducts the fuel, is formed between each adjacent two of the plurality of inner arm portions, which are adjacent to each other in a circumferential direction of the inner valve.

4. The high pressure pump according to claim 1 , wherein:
the outer valve includes:
an outer valve main body, which is configured into an annular form and closes the outer flow path when the outer valve main body is seated against the outer valve seat; and
a plurality of outer arm portions, which radially inwardly extend from the outer valve main body and are contactable with the inner valve; and

a flow path, which conducts the fuel, is formed between each adjacent two of the plurality of outer arm portions, which are adjacent to each other in a circumferential direction of the outer valve.

5. The high pressure pump according to claim 1 , wherein the at least one movement limiting device includes:
an outer stopper, which limits the lift amount of the outer valve at a valve opening time of the outer valve; and
an inner stopper, which limits the lift amount of the inner valve at a valve opening time of the inner valve.

6. The high pressure pump according to claim 5 , wherein:
the inner stopper and the rod are opposed to each other while the inner valve is interposed between the inner stopper and the rod; and
the inner stopper is contactable with an end surface of the inner valve, which is opposite from the rod.

7. The high pressure pump according to claim 5 , wherein:
when the outer valve and the inner valve contact the outer stopper and the inner stopper, respectively, a space is formed between the outer valve and the inner valve.

8. The high pressure pump according to claim 1 , wherein:
the valve seat member includes a recess that is located on a radially inner side of the outer valve seat, and the inner valve is receivable into the recess; and
the inner valve seat is formed in a bottom of the recess.

9. The high pressure pump according to claim 1 , wherein:
a radially inner end surface of the outer valve is tapered to have a reducing inner diameter that is progressively reduced from one end part of the radially inner end surface, which is located on a side where the outer valve seat is placed, to an opposite end part of the radially inner end surface, which is opposite from the outer valve seat; and
a radially outer end surface of the inner valve is tapered to have a reducing outer diameter that is progressively reduced from one end part of the radially outer end surface, which is located on a side where the inner valve seat is placed, to an opposite end part of the radially outer end surface, which is opposite from the inner valve seat.

10. The high pressure pump according to claim 1 , wherein the inner valve and the rod are integrally formed.

Assignees

• Denso Corp

Inventors

• Kato Takehiko
• Koshimoto Shinichiro
• Hishinuma Osamu
• Miyamoto Yutaka

Classifications

• F04B53/1085 Primary

  having means for limiting the opening height (F04B53/101 and F04B53/1035 take precedence) · CPC title

• F04B1/0452 Primary

  Distribution members, e.g. valves (machines or pumps with cam-actuated distribution members at the outer ends of the cylinders F04B1/0472; machines or pumps with cam-actuated distribution members at the inner ends of the cylinders F04B1/0531; the piston-driving cams being provided with inlets and outlets F04B1/0535) · CPC title

• F16K1/32

  Details (details of more general applicability F16K25/00 - F16K51/00) · CPC title

• F02M63/0078

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

• F02M59/466

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