| 主权项 |
1. A solenoid valve for controlling flow amount of fluid, comprising:
a body inside of which is formed into a valve space chamber penetrating in an axial direction, the valve space chamber being divided in sequence into a first pressure-sensing chamber, a first valve chamber, a second valve chamber and a second pressure-sensing chamber by a first partition portion, a second partition portion and a third partition portion; a supply port penetrating said first valve chamber and flowing fluid in and out; an output port penetrating said second valve chamber and flowing fluid in and out; a discharging port penetrating one or both of said first pressure-sensing chamber and said second pressure-sensing chamber respectively and flowing fluid in and out; a first valve member movably arranged in the axial direction inside said first pressure-sensing chamber, said first valve chamber and said second valve chamber, the first valve member having a first communication passage therein for penetrating the first valve member in the axial direction and communicating a first pressure-sensing chamber side and a second valve chamber side; a second valve member movably arranged in the axial direction inside said second valve chamber and said second pressure-sensing chamber, the second valve member having a second communication passage therein for penetrating the second valve member in the axial direction and communicating a second valve chamber side and a second pressure-sensing chamber side; a first poppet valve having any one of a valve body and a valve seating body formed on said second partition portion dividing said first valve chamber and said second valve chamber, and the other one of the valve body and valve seating body formed on said first valve member, the first poppet valve being opened and closed between said first valve chamber and said second valve chamber; a second poppet valve having any one of a valve body and a valve seating body formed on an end portion at a second valve chamber side of said first valve member, and the other one of the valve body and valve seating body formed on an end portion at a second valve chamber side of said second valve member, the second poppet valve for communicating said first communication passage and said second communication passage with said second valve chamber when opening the valve and communicating said first communication passage with said second communication passage when closing the valve; a first pressure sensing portion integrally formed with said first valve member, and slidably arranged on an inner circumference of said first partition portion dividing said first pressure-sensing chamber and said first valve chamber; a second pressure sensing portion integrally formed with said second valve member, and slidably arranged on an inner circumference of said third partition portion dividing said second valve chamber and said second pressure-sensing chamber; a solenoid portion generating magnetic force in predetermined direction depending on applied electric current and making the magnetic force act on said second valve member via a solenoid rod connected to said second valve member; a first spring making elastic force in second valve member direction act on said first valve member; and a second spring making elastic force in opposite direction to the magnetic force, acted by said solenoid portion, act on the second valve member; wherein a first pressure receiving area which is a seating area of said first poppet valve, a second pressure receiving area which is a seating area of said second poppet valve, a third pressure receiving area which is a pressure receiving area of said first pressure sensing portion and a fourth pressure receiving area which is a pressure receiving area of said second pressure sensing portion are approximately equally made. |
