Relief valve device and high-pressure pump using same

Patent metadata

Field	Value
Publication number	US-10907630-B2
Application number	US-201615775903-A
Country	US
Kind code	B2
Filing date	Nov 4, 2016
Priority date	Dec 3, 2015
Publication date	Feb 2, 2021
Grant date	Feb 2, 2021

Abstract

A relief valve, capable of reducing pressure of fuel in a discharge passage and including a valve housing having a communication hole and a valve member provided in a reciprocating manner against the valve housing, where the valve member regulates a flow of the fuel between a discharge passage and a fuel chamber when the valve member is brought into contact with an inner wall formed around the communication hole. T the valve member also allows the flow of the fuel between the discharge passage and the fuel chamber when the valve member is separated from the inner wall. The relief valve further including a spring that biases the valve member such that the valve member and the inner wall are in contact with each other an adjusting pipe and a stopper.

First claim

The invention claimed is:

1. A relief valve device connected to a first space and a second space that is a different space from the first space, the relief valve device configured to reduce pressure of fluid in the first space, the relief valve device comprising:
a valve body having a first valve body formed in a cylindrical shape and a second valve body provided to close an opening of the first body so as to define an inner space;
a valve seat member having a communication hole fluidly connecting the inner space and the first space, and a valve seat formed around the communication hole at a side of the inner space;
a valve member configured to reciprocate against the valve seat member, the valve member regulating a flow of the fluid between the first space and the second space when the valve member is in contact with the valve seat and allowing the flow of the fluid between the first space and the second space when the valve member is separated from the valve seat;
a biasing member configured to bias the valve member such that the valve member and the valve seat are in contact with each other;
a biasing-force-adjusting member connected to the first valve body at an end opposite to the valve seat with respect to the valve member, the biasing-force-adjusting member configured to adjust a biasing force of the biasing member based on a position of the biasing-force-adjusting member; and
a regulating member formed as a different component from the biasing-force-adjusting member and connected to the second valve body, the regulating member regulating a movement of the valve member in a valve opening direction by abutting on the valve member or the valve body when the valve member is moved in the valve opening direction that is a direction away from the valve seat, wherein
the regulating member includes a body side fixing portion fixed to the second valve body, and a body side contact portion formed to extend from the body side fixing portion toward the valve member,
the body side fixing portion and the body side contact portion are integrally formed,
the biasing-force-adjusting member is in a bottomed cylindrical shape and includes a cylinder and a bottom having a through hole,
the body side contact portion of the regulating member includes an end on a side of the valve seat,
an outer diameter of the end is smaller than an outer diameter of the through hole of the bottom,
the end is inserted in the through hole of the bottom, and
the end is contactable with the valve member.

2. The relief valve device according to claim 1 , wherein
the regulating member is contactable with the valve member.

3. A pump, comprising:
a housing including a pressurizing chamber that suctions and pressurizes a fluid, a suction passage from which the fluid suctioned into the pressurizing chamber flows, and a discharge passage to which the fluid pressurized in the pressurizing chamber and discharged flows;
the relief valve device according to claim 1 ;
a suction valve provided between the suction passage and the pressurizing chamber, and configured to adjust an amount of the fluid to be pressurized in the pressurizing chamber; and
a discharge valve provided between the pressurizing chamber and the discharge passage, and configured to discharge the fluid pressurized in the pressurizing chamber to an outside,
wherein the first space is formed by the discharge passage or formed to communicate with the discharge passage.

4. The relief valve device according to claim 1 , wherein
the biasing-force-adjusting member has an end surface that is on a side of the valve member and is a flat surface connecting a radially inner periphery of the biasing-force-adjusting member with a radially outer periphery of the biasing-force-adjusting member, and
when the valve member and the valve seat are in contact with each other, a distance between the end of the regulating member and a surface of the valve member on a side of the end of the regulating member is shorter than a distance between an end surface of the valve member on a side of the biasing-force-adjusting member and the end surface of the biasing-force-adjusting member on the side of the valve member.

5. The relief valve device according to claim 4 , wherein
when the end of the regulating member is in contact with the valve member, the valve member and the biasing-force-adjusting member are not in contact with each other.

6. The relief valve device according to claim 1 , wherein the biasing member includes a spring.

Assignees

• Denso Corp

Inventors

• Koshimoto Shinichiro
• Oda Kaoru
• Sawada Yasuhiro

Classifications

• F02M59/46

  Valves · CPC title

• F16K15/025

  the valve being loaded by a spring (F16K15/03 - F16K15/12 take precedence) · CPC title

• F04B49/22 Primary

  by means of valves (F04B49/03 takes precedence) · CPC title

• F02M63/005 Primary

  Pressure relief valves · CPC title

• Y10T137/7929

  Spring coaxial with valve · CPC title