JPH04145268A - Pressing-in and locking method of spherical valve element into plunger - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention A1 Object of the Invention (1) Industrial Field of Application The present invention provides a method for displacing a piston at the tip of a protrusion provided on a plunger that is movable toward and away from a fixed valve seat member. The present invention relates to a method for press-fitting and fixing a spherical valve body made of a highly hard material into a plunge with a portion thereof protruding from the tip of the protrusion.

(2) Prior Art Conventionally, as disclosed in, for example, Japanese Utility Model Application Publication No. 61-160381, when press-fitting and fixing a spherical valve body into a plunger, a circular recess with a flat closed end is inserted into the plunger. The spherical valve body is press-fitted into the circular recess so as to be in point contact with the flat surface, and then the peripheral edge of the tip of the protrusion of the plunger is caulked and coupled to the spherical valve body.

(3) Problem R to be solved by the invention However, if the hardness of the spherical valve body is higher than the hardness of the plunger, if the spherical valve body and the closed end of the circular recess are brought into point contact as described above, Since the contact area is relatively small, the contact pressure between the spherical valve element and the closed end of the circular recess due to the pressing force that acts on the spherical valve element when the spherical valve element is seated on the valve seat member becomes relatively large, and the spherical valve The valve body bites into the closed end of the circular recess, and during assembly, the amount of protrusion of the spherical valve body from the tip of the protrusion that has been set may change.

The present invention has been made in view of the above circumstances, and provides a method for press-fitting and fixing a spherical valve body to a plunger in a manner that prevents changes in dimensions as much as possible when assembling the spherical valve body to the plunger. The purpose is to provide.

B2 Structure of the Invention (]) Means for Solving the Problems In order to achieve the above object, according to the present invention, a bottomed circular recess is provided at the closed end with a tapered surface that becomes larger in diameter toward the exit end. is formed at the tip of the protrusion of the plunger, and the spherical valve element is press-fitted into the circular recess so as to bite into the tapered surface, and the peripheral edge of the tip of the protrusion is caulked and coupled to the spherical valve element.

(2) Effect According to the above method, by press-fitting the spherical valve body into the circular recess so as to bite into the tapered surface of the circular recess,
It is possible to relatively increase the contact area between the spherical valve body and the closed end of the circular recess with a relatively small amount of plastic deformation (small press-fit load), and therefore the surface between the spherical valve body and the closed end of the circular recess is It becomes possible to make the pressure relatively small. Furthermore, the tapered surface can be easily formed using a common drill.

(3) Examples An embodiment of the present invention will be described below with reference to the drawings.

The drawings show one embodiment of the present invention, and FIG. 1 is a longitudinal cross-sectional view of a solenoid valve, and FIG. 2 is a view sequentially showing a procedure for press-fitting and fixing a spherical valve body into a plunger.

First, in FIG. 1, this solenoid valve has a fixed core 1
, the yoke 2 , the plunger 4 housed in the valve chamber 3 formed between the fixed core 1 and the yoke 2 , and the valve chamber 3
A valve seat member 5 fixed to the yoke 2 facing toward the valve seat member 5, a spherical valve body 6 provided in the plunger 4 to enable seating on the valve seat member 5, and a direction in which the spherical valve body 6 is seated on the valve seat member 5. A return spring 7 is interposed between the plunger 4 and the fixed core 1 in the valve chamber 3 in order to urge the plunger 4 to the fixed core 1. It is equipped with a coil 8 for suction on the side.

The fixed core 1 is fitted into a magnetic cylinder 9 made of a magnetic material such as a ferrous metal, and the magnetic cylinder 9 and the yoke 2 are connected to a non-magnetic cylinder 10 made of a non-magnetic material such as stainless steel. are connected to each other via. The fixed core 1 is basically formed in a cylindrical shape with a radially outwardly projecting flange 1a at one end, and the magnetic cylindrical body 9 continues until the one end comes into contact with the flange 1a. An O-ring 11 is fitted into the magnetic cylindrical body 9 and is fitted onto the outer surface of the fixed core 1 so as to contact the inner surface of the magnetic cylindrical body 9. Further, at the other end of the magnetic cylindrical body 9, a small-diameter cylindrical portion 9a having a smaller outer diameter is provided via a stepped portion. Furthermore, the non-magnetic cylindrical body 10 has a first large diameter hole 10a into which the small diameter cylindrical portion 9a is fitted, and a small diameter hole 10a that is smaller in diameter than the first large diameter hole 10a and is the same as the inner diameter of the magnetic cylinder 9. A hole 10b and a second large-diameter hole 10c having the same diameter as the first large-diameter hole 10a are coaxially connected. Furthermore, the yoke 2 is provided with a protruding cylindrical portion 2a that is fitted into the second large diameter hole 10c. With the small diameter cylindrical portion 9a and the cylindrical portion 2a fitted into the first and second large diameter holes 10a and 10c of the nonmagnetic cylindrical body 10, the space between the nonmagnetic cylindrical body 10 and the fixed core 1, and the nonmagnetic Cylindrical body 10 and yoke 2
The outer surfaces of the fixed core 1 and the non-magnetic cylindrical body 10 are flush with each other in the coupled state, and the non-magnetic cylindrical body 10 and the cylindrical part 2a are connected to each other by brazing or welding.
The inside surface is also flush.

The coil 8 is wound around a bobbin 12 and inserted into a cover 13. That is, the cover 13 is made up of a bottomed cylindrical portion 13a into which the fixed core 1 and the magnetic cylindrical body 9 are fitted, and a cylindrical portion 13C into which the bobbin 12 is fitted, which are coaxially coupled via a stepped portion 13b. The thin wall portion 13d provided at the tip of the cylindrical portion 13c is the flange portion 2 of the yoke 2.
It is caulked to b. By caulking the cover 13 to the yoke 2, the bobbin 12 is held between the step portion 13b and the yoke 2, and the coil 8 is attached to the non-magnetic cylindrical body 1.
It will be placed surrounding 0.

The surface of the fixed core 1 facing the valve chamber 3 is made of non-magnetic material in order to avoid suppression of the operation of the plunger 4 on the side away from the fixed core 1 due to residual magnetism when the plunger 4 comes into direct contact with the fixed core 1. The plunger 4 is able to move toward the fixed core 1 until it comes into contact with the stopper plate 14 . Further, the valve seat member 5 is fitted and fixed to the central part of the yoke 2 on the valve chamber 3 side, and the valve seat member 5 has a passage 15 formed in the yoke 2.
16 leading to is drilled. Further, around the valve seat member 5 in the yoke 2, there are a plurality of passages 17 communicating with the valve chamber 3.
... is drilled.

The tip of the valve seat member 5 is projected into the valve chamber 3, and a spherical valve body 6 is seated on the tip of the valve seat member 5 to close the valve hole 16 according to the method of the present invention. , is press-fitted and fixed to the end of the plunger 4 on the yoke 2 side.

Referring also to FIG. 2, the spherical valve body 6 is made of stainless steel, while the plunger 6 is made of a low carbon material (such as SUY or 515C) that has a lower hardness than stainless steel. A spherical valve body 6 is press-fitted and fixed to the tip of a protrusion 4a protruding from the center of the end surface of the plunger 4 on the side of the yoke 2. That is, at the tip of the protrusion 4a, there is a tapered surface 20 that becomes larger in diameter toward the open end.
Fig. 2(a) shows a bottomed circular recess 20 with a closed end.
As shown in FIG. 2(C), the spherical valve body 6 is press-fitted into the circular recess 20 so that a portion thereof bites into the tapered surface 20a.

By doing this, the tapered surface 2 of the plunger 4
Even if the amount of plastic deformation 0a is small, that is, the amount of press-fitting load of the spherical valve body 6 into the circular recess 20 is relatively small, the contact area between the spherical valve body 6 and the closed end of the circular recess 20, that is, the tapered surface 20a, is It can be relatively large. Moreover, the tapered surface 20a can be easily formed using a common drill. Next, as shown in FIG. 2(C), the peripheral edge of the tip of the protrusion 4a is caulked and coupled to the spherical valve element 6, thereby completing the fixing of the spherical valve element 6 to the plunger 4.

In addition, the plunger 4 is provided with a plurality of circulation holes 21 to avoid partitioning the inside of the valve chamber 3 into the fixed core 1 and yoke 2 sides, and when the plunger 4 moves, The movement of the plunger 4 becomes smooth due to the fluid flowing through the circulation holes 21 .

Next, the operation of this embodiment will be explained. When the coil 8 is demagnetized, the plunger 4 is in the position of the yoke 2 as shown in FIG. 1 due to the spring force of the return spring 7, and the spherical valve body 6
is seated at the tip of the valve seat member 5 and closes the valve hole 16. When the coil 8 is energized, the plunger 4 is attracted toward the fixed core 1 against the spring force of the return spring 7 until it comes into contact with the stopper plate 14, and the spherical valve body 6 is separated from the valve seat member 5. Open the valve hole 16, thereby opening the passage 15.1.
7 spaces are connected.

In this way, the plunger 4 repeatedly moves toward and away from the yoke 2 within the valve chamber 3, thereby opening and closing the solenoid valve.
is being moved toward the yoke 2 by the spring force of the return spring 7, the spherical valve element 6 is pressed against the tip of the valve seat member 5 by the spring force of the return spring 7, and the reaction force causes the spherical valve body 6 to move toward the yoke 2 side. The body 6 will be pressed towards the closed end of the circular recess 20. However, the closed end of the circular recess 20 is formed as a tapered surface 20a, and a portion of the spherical valve body 6 bites into the tapered surface 20a, so the contact area between the spherical valve body 6 and the tapered surface 20a is relatively large. , the contact surface pressure is relatively small. Therefore, even if the hardness of the plunger 4 is lower than the hardness of the spherical valve body 6, the spherical valve body 6 is prevented from further digging into the tapered surface 20a, and the amount of protrusion from the protrusion 4a can be set and the spherical valve body After the spherical valve body 6 is assembled to the plunger 4, the spherical valve body 6 is prevented from being further buried in the plunger 4 and the amount of protrusion is prevented from changing as much as possible.

C6 Effects of the Invention As described above, according to the present invention, a circular recess with a bottom is formed at the tip of the protrusion of the plunger, and the closed end has a tapered surface that becomes larger in diameter toward the open end. The spherical valve body is press-fitted into the circular recess so as to bite into the surface, and the peripheral edge of the tip of the protrusion is caulked and connected to the spherical valve body, so that the amount of plastic deformation is relatively small and the spherical valve body and circular By making the contact area with the closed end of the recess relatively large, it is possible to make the contact surface pressure relatively small, and it is possible to prevent changes in dimensions as much as possible when assembling the spherical valve body to the plunger. Moreover, it is easy to form a tapered surface.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a longitudinal sectional view of a solenoid valve, and FIG. 2 is a diagram sequentially showing the procedure for press-fitting and fixing a spherical valve body into a plunger. 4... Plunger, 4a... Protrusion, 5... Valve seat member, 6... Spherical valve body, 20... Circular recess, 20a...
...Tapered surface Fig. 1 Fig. 2 (b) (C)

Claims (1)

[Claims] A spherical valve body (6) made of a material harder than the plunger (4) is attached to the tip of the protrusion (4a) provided on the plunger (4), which is movable towards and away from the fixed valve seat member (5). ) into the plunger of the spherical valve body with a part thereof protruding from the tip of the protrusion (4a).
In the fixing method, a bottomed circular recess (20) having a tapered surface (20a) whose diameter becomes larger toward the open end at the closed end is formed at the tip of the protrusion (4a) of the plunger (4), The spherical valve body (6) is press-fitted into the circular recess (20) so as to bite into the tapered surface (20a), and the peripheral edge of the tip of the protrusion (4a) is caulked and connected to the spherical valve body (6). A method for press-fitting and fixing a spherical valve body into a plunger, characterized by: