JP2558222Y2 - valve - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a valve used to maintain or release a high pressure in a fluid flow path, such as a spill valve of a fuel injection device of an internal combustion engine.

[0002]

2. Description of the Related Art Conventionally, as a valve of this type, FIG.
The following are known. That is, FIG.
1 is a body having an oil flow path 2 and a cylindrical valve chamber 3 traversing the oil flow path 2 and having both ends opened. A tapered valve seat 31 that opens toward the outside of the valve seat 1 is formed. Reference numeral 4 denotes a valve body, which is a cylindrical sliding seal portion 4a held on the inner peripheral surface of the valve chamber 3 so as to be airtightly slidable, and a tapered closing portion 4b which comes into contact with and separates from the inner peripheral edge of the valve seat 31. And a shaft portion 4c connecting the sliding seal portion 4a and the closing portion 4b. In addition, the oil flow path 2 includes a sliding surface 32 of the inner peripheral surface of the valve chamber 3 with the sliding seal portion 4 a of the valve body 4 and a valve seat 3.
The armature 5 is open toward the space 3S on the outer periphery of the shaft portion 4c located between the armatures 1. The armature 5 is integrally provided in the valve body 4 so as to be opposed to the solenoid 6 outside the body 1.

In this valve, when the solenoid 6 is energized and the armature 5 is magnetically attracted, the valve body 4 is displaced to the left in the drawing, the shut-off portion 4b is separated from the valve seat 31, and the oil flowing through the flow path 2 Release pressure. When the power to the solenoid 6 is turned off, the valve body 4 returns to the state shown in the figure, and the sealing action by the contact between the valve seat 31 and the shut-off portion 4b and the sliding motion between the inner diameter sliding surface 32 of the valve chamber 3 and the inner surface. The oil flowing through the flow path 2 is maintained at a high pressure by the sealing action by the contact of the dynamic seal portion 4a. The oil in the flow path 2 flows through the space 3S in the valve chamber 3.

[0004]

However, in the valve of the above-mentioned conventional structure, the valve body 4 is provided with the cylindrical sliding surface 3 of the valve chamber 3.
2 and has no degree of freedom in the direction perpendicular to the axis, the concentricity between the cylindrical sliding surface 32 and the tapered valve seat 31, and the cylindrical sliding seal 4a. If the concentricity between the portion 4a and the tapered cut-off portion 4b is not finished with extremely high precision, a gap is formed in a part of the circumferential direction between the valve seat 31 and the cut-off portion 4b in the cut-off state shown in the drawing, and the flow path 2 There has been a problem that the sealing property cannot be maintained when the inside becomes high pressure.

The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to eliminate the need to make the coaxiality between a valve chamber and a valve seat highly accurate, and to provide a seal at the time of shutoff. Is to improve.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a sliding seal in which a valve body is air-tightly slidably held on an inner peripheral surface of a cylindrical valve chamber having both ends opened. Department and
It comprises a shut-off portion that comes into contact with and separates from the inner diameter of the tapered valve seat formed at one end of the valve chamber, and a shaft portion that connects the sliding seal portion and the shut-off portion. In a valve opened between a sliding surface with a dynamic seal portion and a valve seat, a sliding seal portion and a shutoff portion of a valve body are each formed in a spherical shape.

[0007]

According to the above construction, 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 of the coaxiality between the valve chamber and the valve seat is improved. , The valve body can be appropriately angularly displaced. In addition, since the shutoff portion of the valve element has a spherical shape, the valve body surely comes into close contact with the entire circumference of the valve seat even in the angular displacement state.

[0008]

1 shows an embodiment of a valve according to the present invention, wherein 1 is a body, 2 is an oil flow path, and 3 is a cylinder opened across the flow path 2 and both ends being open. The valve chamber 31 is a tapered valve seat 31 formed at one end opening of the valve chamber 3. Reference numeral 40 denotes a valve body, which is a sliding seal portion 41 made of a steel ball held slidably and airtightly on the cylindrical inner peripheral surface of the valve chamber 3 and a hemispherical closing portion which comes into contact with and separates from the inner peripheral edge of the valve seat 31. 4
2 and a shaft 43 connecting the sliding seal portion 41 and the cut-off portion 42. On the back surface of the cut-off portion 42, an armature 5 is provided integrally with and opposed to a solenoid 6 outside the body 1. I have.

The flow path 2 is formed between the sliding surface 32 of the valve body 4 with the sliding seal portion 41 and the valve seat 31 on the inner peripheral surface of the valve chamber 3, that is, the sliding seal portion 41 and the shut-off portion 42. The valve body 40 is displaced to the left in the figure by energizing the solenoid 6 and magnetically attracting the armature 5 in the same manner as in the above-described conventional example. Open to release the pressure of the oil flowing through the distribution channel 2. When the power supply to the solenoid 6 is turned off, the valve body 40 returns to the shut-off state shown in the drawing, and keeps the oil in the flow path 2 including the space 3S at a high pressure. At this time, since the hydraulic pressures acting on the sliding seal portion 41 and the shut-off portion 42 in the space 3S are balanced in the axial direction, the valve body 40 maintains the shut-off 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 closing portion 42 has a spherical shape. Even if there is an error in the coaxiality between the valve chamber 3 and the tapered valve seat 31,
At the time of closing, the valve body 40 is angularly displaced in accordance with the error of the coaxiality, the spherical surface of the closing portion 42 is in close contact with the valve seat 31, and the spherical sliding seal portion 41 is also the inner sliding surface of the valve chamber 3. 32 is always kept in close contact. In addition, even when the shaft 43 of the valve body 40 is inclined or bent, there is an error in the coaxiality between the sliding seal 41 and the cut-off part 42. As long as there is no contact with the inner peripheral surface of the chamber 3, the shut-off portion 42 is securely in close contact with the valve seat 31.

[0011]

According to the valve of the present invention, since the sliding seal portion held on the inner peripheral surface of the valve chamber and the shut-off portion which comes into contact with and separates from the valve seat are spherical, the coaxiality between the valve chamber and the valve seat is increased. Even if there is an error, or even if there is an error in the coaxiality between the sliding seal portion and the shut-off portion of the valve body, the valve body is appropriately angularly displaced at the time of shut-off, and the spherical shut-off portion becomes the entire circumference of the valve seat. And a good sealing property can be exhibited. Further, for this reason, there is no need for highly accurate coaxiality between the valve chamber, the valve seat, and the sliding seal portion and the cutoff portion of the valve element, and an excellent effect is obtained that the valve can be easily manufactured.

[Brief description of the 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.

[Description of Signs] 1 Body 2 Flow path 3 Valve room 3S space 5 Armature 6 Solenoid 31 Valve seat 32 Sliding surface 40 Valve element 41 Sliding seal part 42 Shut-off part 43 Shaft part

Claims (1)

(57) [Scope of request for utility model registration] 1. A valve body (40) has both ends opened cylindrical valve chamber (3) sliding seal portion which is held freely hermetically sliding on the inner peripheral surface of the (41), a valve chamber ( 3 ) a cut-off portion ( 42 ) that comes into contact with and separates from a tapered valve seat ( 31 ) formed at one end; and a shaft portion ( 43 ) that connects the slide seal portion ( 41 ) and the cut-off portion ( 42 ). And the flow path ( 2 ) of the pressure fluid is
Sliding surface ( 3 ) with sliding seal part ( 41 ) in valve chamber ( 3 )
2 ) In the valve opened between the valve seat ( 31 ) and the sliding seal part ( 41 ) and the shutoff part of the valve body ( 40 ).
( 42 ) A valve characterized in that each is formed in a spherical shape.