# US 2019/0170100 A1 · Relief valve device and high-pressure pump

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2019/0170100 A1
- Document ID: US20190170100A1
- Status: Published application
- Kind: A1
- Application number: 16/269,590
- Filed: 2019-02-07
- Published: 2019-06-06
- Earliest claimed: 2016-08-26
- Assignees: Denso Corporation
- Applicants: Denso Corporation
- Inventors: Shinichiro KOSHIMOTO; Yoshihito SUZUKI
- Web page: https://patentgrep.com/patent/US20190170100A1

## CPC

- F02M 59/46: Valves
- F02M 59/36: by variably-timed valves controlling fuel passages {to pumping elements or overflow passages}
- F02M 59/44: Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; {Pumps having transducers, e.g. to measure displacement of pump rack or piston}
- F02M 69/54: Arrangement of fuel pressure regulators
- F16K 17/04: spring-loaded
- F16K 17/22: actuated by the difference of pressure between two places in the flow line
- F16K 24/02: the enclosure being itself a valve, tap, or cock
- F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F16K: VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING {(devices for emptying and evacuating the excess liquid in valves or conduits F16L55/07)}

## Abstract

A relief valve device includes: a valve housing that includes a communication passage, which communicates between a first pressure chamber and a second pressure chamber, and a relief chamber, which is configured to communicate with the second pressure chamber; a partition wall that is formed in an inside of the valve housing and partitions between the communication passage and the relief chamber; a first valve member that is configured to block and enable flow of fluid between the first pressure chamber and the communication passage; a first urging member that urges the first valve member; a second valve member that is configured to block and enable flow of the fluid between the second pressure chamber and the relief chamber; and a second urging member that urges the second valve member.

## Claims

### Claim 1

A relief valve device that is configured to connect with a first pressure chamber and a second pressure chamber and is operable to reduce a pressure of fluid in the second pressure chamber, the relief valve device comprising:
a valve housing that includes:
a communication passage, which communicates between the first pressure chamber and the second pressure chamber; and
a relief chamber, which is configured to communicate with the second pressure chamber;
a partition wall that is formed in an inside of the valve housing and partitions between the communication passage and the relief chamber;
a first valve member that is configured to block and enable flow of fluid between the first pressure chamber and the communication passage;
a first urging member that has one end, which contacts the first valve member, and another end, which contacts the partition wall, wherein the first urging member urges the first valve member in an opposite direction that is opposite from the partition wall;
a second valve member that is configured to block and enable flow of the fluid between the second pressure chamber and the relief chamber; and
a second urging member that has one end, which contacts the second valve member, and another end, which contacts the partition wall, wherein the second urging member urges the second valve member in an opposite direction that is opposite from the partition wall.

### Claim 2 (depends on 1)

The relief valve device according to claim 1, wherein the valve housing includes:
a casing that is shaped into a tubular form; and
a relief-chamber forming member that is received in the casing and includes the communication passage and the relief chamber.

### Claim 3 (depends on 2)

The relief valve device according to claim 2, wherein:
the relief-chamber forming member includes:
a relief seat member that includes:
a relief through hole, which is configured to enable communication between the second pressure chamber and the relief chamber through the relief through hole, and
a relief valve seat that is formed around an opening of the relief through hole located on a side where the relief chamber is placed, wherein the relief seat member slidably supports the second valve member; and
a tubular member that is shaped into a hollow tubular form and is formed separately from the relief seat member, wherein the tubular member is configured to fix the relief seat member in an inside of the tubular member;
the relief seat member includes:
a relief valve seat portion that includes the relief through hole and the relief valve seat; and
an outside contact portion that has an outer wall surface, which is located at a radially outer side of the outside contact portion and is configured to contact the tubular member when the outside contact portion is fixed to the tubular member; and
an inside slide portion that has an inner wall surface, which is located at a radially inner side of the inside slide portion and is slidable relative to the second valve member; and
the relief valve seat portion, the outside contact portion and the inside slide portion are placed at different locations, respectively, in a direction, along which the second valve member is reciprocated.

### Claim 4 (depends on 2)

The relief valve device according to claim 2, wherein the relief-chamber forming member includes at least two hollow members that are formed separately from each other and respectively have a space in an inside thereof.

### Claim 5 (depends on 4)

The relief valve device according to claim 4, wherein:
the at least two hollow members include a first hollow member and a second hollow member; and
liquid-tightness of the relief chamber is maintained through contact between a first end surface of the first hollow member and a second end surface of the second hollow member.

### Claim 6 (depends on 5)

The relief valve device according to claim 5, wherein a contact location, at which the first end surface and the second end surface contact with each other, is communicated with a fluid storage chamber that stores fluid to be supplied to the first pressure chamber.

### Claim 7 (depends on 1)

The relief valve device according to claim 1, wherein an opposite end surface of the first valve member is exposed to the communication passage while the opposite end surface of the first valve member is opposite from a contact side of the first valve member that is configured to contact a first valve seat placed on the communication passage side of a first through hole that is configured to enable communication between the first pressure chamber and the communication passage through the first through hole.

### Claim 8 (depends on 1)

The relief valve device according to claim 1, wherein the valve housing includes:
an urging-member receiving chamber that is configured to receive a portion of the first urging member; and
a receiving-chamber communication passage that communicates between the urging-member receiving chamber and the communication passage.

### Claim 9 (depends on 8)

The relief valve device according to claim 8, wherein the first valve member is slidable relative to an inner wall of the valve housing that forms the urging-member receiving chamber.

### Claim 10 (depends on 1)

The relief valve device according to claim 1, wherein:
the communication passage is one of a plurality of communication passages formed at the valve housing; and
the plurality of communication passages is placed on a radially outer side of the relief chamber and is arranged along a concentric circle that is centered at a point along a central axis of the valve housing.

### Claim 11 (depends on 1)

The relief valve device according to claim 1, wherein the communication passage is placed on one side of the relief chamber in a radially outward direction.

### Claim 12 (depends on 1)

A high-pressure pump comprising:
a pump housing that includes:
a pressurizing chamber that is configured to draw fuel as the fluid and pressurize the drawn fuel;
a suction passage that is configured to conduct the fuel to be drawn in the pressurizing chamber; and
a discharge passage that is configured to conduct the fuel that is pressurized in and is discharged from the pressurizing chamber;
a suction valve that is placed between the suction passage and the pressurizing chamber and is configured to adjust an amount of the fuel to be pressurized in the pressurizing chamber; and
the relief valve device of claim 1 while the relief valve device is placed between the pressurizing chamber and the discharge passage and is configured to discharge the fuel, which is pressurized in the pressurizing chamber, to a fuel rail, wherein:
the first pressure chamber is the discharge passage, and the second pressure chamber is the fuel rail.

### Claim 13 (depends on 12)

The high-pressure pump according to claim 12, further comprising a fuel storage portion that is configured to store the fluid to be supplied to the suction valve, wherein the relief chamber is communicated with the fuel storage portion.