JPH0532878U - valve - Google Patents

Abstract

(57) [Abstract] [Purpose] It is not necessary to make the coaxiality of the valve chamber 3 and the valve seat 31 and the coaxiality of the sliding seal portion 41 and the cutoff portion 42 of the valve body 40 highly accurate, and the sealability at the time of shutoff Improve. [Structure] A slide seal portion 4 in which a valve body 40 is held airtightly and slidably on an inner peripheral surface of a cylindrical valve chamber 3 whose both ends are open.
1, a shutoff portion 42 that comes in contact with and separates from a tapered valve seat 31 formed at one end of the valve chamber 3, the sliding seal portion 41, and the shutoff portion 4.
In the valve formed by the shaft portion 43 connecting the two, the flow path 2 of the pressure fluid is opened so as to face the sliding surface 32 with the sliding seal portion 41 in the valve chamber 3 and the valve seat 31. By forming the sliding seal portion 41 and the shutoff portion 42 in a spherical shape, the degree of freedom of the valve body 40 is improved.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement in a valve used for maintaining a high pressure in a fluid passage and releasing the pressure, such as a spill valve of a fuel injection device for an internal combustion engine.

[0002]

[Prior Art]

 Conventionally, as this type of valve, a valve as shown in FIG. 2 is known. That is, in the valve of FIG. 2, reference numeral 1 denotes a body having an oil flow passage 2 and a cylindrical valve chamber 3 which is open at both ends across the oil flow passage 2. A tapered valve seat 31 that opens toward the outside of the body 1 is formed in the opening at one end. Reference numeral 4 denotes a valve body, which is a cylindrical sliding seal portion 4a that is held on the inner peripheral surface of the valve chamber 3 so as to be airtightly slidable, and a tapered cutoff portion 4b that comes in contact with and separates from the inner diameter edge of the valve seat 31. And a shaft portion 4c connecting the sliding seal portion 4a and the shutoff portion 4b. Further, the oil flow path 2 has an outer peripheral surface of the shaft portion 4c located between the sliding surface 32 of the valve body 4 and the sliding seal portion 4a of the valve body 4 and the valve seat 31 on the inner peripheral surface of the valve chamber 3. The valve body 4 is provided with an armature 5 that faces the space 3S and closely faces the solenoid 6 outside the body 1.

In this valve, by energizing the solenoid 6 and magnetically attracting the armature 5, the valve body 4 is displaced to the left side in the figure, and the shutoff portion 4 b is separated from the valve seat 31 and the flow path 2 is closed. Relieve the pressure of flowing oil. Further, by turning off the power supply to the solenoid 6, the valve body 4 is returned to the state shown in the figure, and the sealing action by the contact between the valve seat 31 and the shutoff portion 4b and the inner diameter sliding surface 32 of the valve chamber 3 are achieved. The oil that flows through the flow passage 2 is maintained at a high pressure by the sealing action of the contact between the sliding seal portion 4a and the sliding seal portion 4a. The oil in the circulation path 2 flows through the space 3S in the valve chamber 3.

[0004]

However, in the valve having the above-described conventional structure, the valve body 4 is constrained by the cylindrical sliding seal portion 4a which is in close contact with the cylindrical sliding surface 32 of the valve chamber 3, and the axial center Since there is no freedom in the direction perpendicular to, the coaxiality of the cylindrical sliding surface 32 and the tapered valve seat 31 and the coaxiality of the cylindrical sliding seal portion 4a and the tapered cutoff portion 4b are finished with extremely high precision. Otherwise, a gap is created in the circumferential direction between the valve seat 31 and the shutoff portion 4b in the shutoff state shown in the figure, and the sealing performance can be maintained when the pressure in the flow passage 2 becomes high. There was a problem that disappeared.

The present invention has been made in view of the above problems, and it is an object of the present invention that the coaxiality between the valve chamber and the valve seat does not have to be highly accurate, and the sealing property at the time of shutting off is not required. Is to improve.

[0006]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention provides a valve body formed at one end of a valve seal and a sliding seal part that is held in an inner peripheral surface of a cylindrical valve chamber that is open at both ends in an airtight manner. The taper valve seat has a closed part that comes into contact with and separates from the inner diameter of the tapered seat, and a shaft part that connects the sliding seal part and the closed part. In a valve opened between the moving surface and the valve seat, the sliding seal portion and the shut-off portion of the valve body are formed into spherical shapes.

[0007]

[Action]

 According to the above configuration, since the sliding seal portion held on the inner peripheral surface of the cylindrical valve chamber has a spherical shape, the degree of freedom of the valve body is improved, and the error in the coaxiality between the valve chamber and the valve seat is dealt with. The valve body can be appropriately angularly displaced. In addition, since the shut-off portion of the valve body is spherical, the valve seat is surely brought into close contact with the entire circumference of the valve seat even in the angular displacement state.

[0008]

【Example】

 FIG. 1 shows an embodiment of a valve according to the present invention, wherein 1 is a body, 2 is an oil flow passage, and 3 is a cylindrical valve chamber opened across the flow passage 2 and open at both ends. , 31 are tapered valve seats 31 formed at one end opening of the valve chamber 3. Reference numeral 40 denotes a valve element, which is a sliding seal portion 41 made of a steel ball held in a cylindrical inner peripheral surface of the valve chamber 3 so as to be capable of sliding in an airtight manner, and a hemispherical cutoff portion which comes in contact with and separates from an inner diameter edge of the valve seat 31. 42 and a shaft portion 43 connecting the sliding seal portion 41 and the shutoff portion 42. On the back surface of the shutoff portion 42, an armature 5 that closely faces the solenoid 6 outside the body 1 is integrally provided. ing.

The flow path 2 includes a portion of the inner peripheral surface of the valve chamber 3 between the sliding surface 32 of the valve body 4 and the sliding seal portion 41 and the valve seat 31, that is, the sliding seal portion 41 and the shutoff portion 42. In the same manner as the prior art example, the solenoid 6 is energized to magnetically attract the armature 5 and the valve body 40 is displaced to the left side in the drawing to open the space 3S. It is released and the pressure of the oil flowing through the distribution channel 2 is released. When the solenoid 6 is turned off, the valve body 40 returns to the shut-off state shown in the figure, and the oil in the flow passage 2 including the space 3S is held at a high pressure. At this time, since the hydraulic pressures acting on the sliding seal portion 41 and the shutoff portion 42 in the space 3S are balanced in the axial direction, the valve element 40 maintains the shutoff state.

Here, since the sliding seal portion 41 of the valve body 40 is made of a steel ball, the degree of freedom in the angular displacement direction of the valve body 40 is good, and the shutoff portion 42 also has a spherical shape. Even if there is an error in the coaxiality between the valve chamber 3 and the tapered valve seat 31, the valve body 40 is angularly displaced according to the error in the coaxiality at the time of shutoff, and the spherical surface of the shutoff portion 42 comes into close contact with the valve seat 31. The spherical sliding seal portion 41 always maintains a close contact with the inner diameter sliding surface 32 of the valve chamber 3. In addition, even if the shaft 43 of the valve body 40 is inclined or bent, and there is an error in the coaxiality between the sliding seal portion 41 and the shutoff portion 42, the shaft portion 43 will not move at the shutoff time. As long as there is no contact with the inner peripheral surface of the valve chamber 3, the shutoff portion 42 surely comes into close contact with the valve seat 31.

[0011]

[Effect of the device]

 According to the valve of the present invention, since the sliding seal part held on the inner peripheral surface of the valve chamber and the shut-off part that comes in contact with and separates from the valve seat are spherical, there is an error in the coaxiality between the valve chamber and the valve seat. In addition, even if there is an error in the coaxiality between the sliding seal part and the shut-off part of the valve body, the valve body will be displaced at an appropriate angle during the shut-off time, and the spherical shut-off part will be surely secured over the entire circumference of the valve seat. It is in close contact and can exhibit good sealing properties. Further, for this reason, the coaxiality with high accuracy between the valve chamber and the valve seat, the sliding seal portion of the valve body, and the closing portion is not required, and the excellent effect that the valve is easily manufactured is exhibited.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the valve of the present invention.

FIG. 2 is a sectional view showing an example of a valve having a conventional structure.

[Explanation of symbols]

 1 Body 2 Distribution Channel 3 Valve Chamber 3S Space 5 Armature 6 Solenoid 31 Valve Seat 32 Sliding Surface 40 Valve Body 41 Sliding Seal Part 42 Shutoff Part 43 Shaft Part

Claims (1)

[Scope of utility model registration request] 1. A valve body 40 is formed at one end of the valve chamber 3 and a sliding seal portion 41 that is hermetically slidably held on the inner peripheral surface of a cylindrical valve chamber 3 whose both ends are open. Tapered valve seat 31
And the sliding seal portion 41 and the shaft portion 43 connecting the closing seal portion 42, and the flow passage 2 of the pressure fluid slides on the sliding seal portion 41 in the valve chamber 3. Moving surface 32
In the valve opened between the valve seat 31 and the valve seat 31, the sliding seal portion 41 and the shutoff portion 42 of the valve body 40 are formed into spherical shapes, respectively.