JPH04244681A - Electromagnetic valve - Google Patents

Abstract

PURPOSE: To facilitate manufacture and assembling by fitting a thin sleeve to an addition part of a valve body of an electromagnetic valve and by housing a valve seat holding body in this sleeve as a plate-state lateral wall. CONSTITUTION: In this valve 1, a valve body 4 is coupled to a yoke 3 surrounding a coil 2, and a cylindrical addition part 5 useful as an extreme piece of the valve body 4 is engaged in the coil 2. A needle 8 is fitted in a capsule 6 penetrating the coil 2, a push rod 9 penetrating the valve body 4 is fitted with this needle 8, and the push rod 9 holds a valve closing body 11 in the spherical state at an end 10 opposite to the needle 8. The valve body 4 has an addition part 14 of a cylindrical table on the side opposite to the coil 2, and a metal sleeve 17 with a thin wall coaxially extending to the push rod 9 is inserted into this addition part 14. And the valve seat holding body is housed in the sleeve 17 provided with through holes 29 and 30 for pressure media as a plate-state lateral wall 18.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to an electromagnetic valve, which
A valve body that supports the coil and the mover, a push rod that penetrates the valve body and engages with the mover, a valve closing body disposed at the end of the push rod opposite to the mover, and a valve body that is attached to the valve closing body. The valve seat holder is attached directly to the cylindrical extension of the valve.

0002

BACKGROUND OF THE INVENTION In a known valve of the above type (German Published Application No. 3940124), a vertical hole is formed in the valve body which is stepped from the coil side. On one side, this longitudinal bore serves to receive the valve seat holder, which is designed as a cylinder, as well as the pole piece, and on the other side forms a guide hole for guiding the pressure medium to the valve seat holder. A transverse hole in the area of the valve seat holder is used as a pressure medium introduction hole. Due to the above-mentioned design of the valve body, which is relatively long in the axial direction, many cutting operations are required, which increases the manufacturing costs of the valve. Furthermore, assembly and inspection work is difficult. This is because the valve seat holder and the pole piece must first be assembled into the valve body before the push rod, armature, armature guide sleeve, coil and yoke are assembled. Adjustment of the function of the components forming the magnetic field of the valve is only possible at the final assembly stage.

0003

[Effect of the invention] In the electromagnetic valve based on the present invention,
During assembly there are two component units: the valve body;
A first component consisting of the armature, armature guide sleeve, coil and yoke and a second component consisting of the valve seat holder and the sleeve surrounding the valve seat holder are formed. The first component generates the magnetic field and is separately regulated. The second component is simply integrated into the valve body and fixed after adjustment of the air gap. Based on this structure, the valve seat holder can be made shorter in the axial direction than the conventional valve seat holder. Furthermore, the valve is simple to manufacture, since the push rod requires only a smooth through hole.

[0004] Advantageous embodiments of the valve according to the invention are possible with the measures set forth in the subclaims.

[0005] According to the structure described in claim 2, the valve seat holder can be easily inserted into the valve seat holder, and the valve seat holder can be easily and reliably fixed within the sleeve.

[0006] With the arrangement according to claim 3, the valve can be easily adapted to different conditions of use by attaching the sleeve, which is constructed as a suitable insert, to the valve body, which is constructed the same for all conditions.

[0007] The measures according to claim 4 improve the arrangement and the type of fastening of the sealing ring.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The valve 1 shown in the drawings has a coil 2 which is surrounded by a yoke 3. The yoke 3 is connected to the valve body 4, and a cylindrical extension 5, which serves as a pole piece of the valve body, engages in the coil 2. A thin-walled capsule 6 passing through the coil 2 is fastened to the extension 5 by a weld 7 with an annular seal after adjustment of the armature stroke. A movable element 8 is guided in the capsule 6 so as to be movable in the longitudinal direction. The aforementioned parts of the valve 1 form a first component. The movable element 8 is engaged with a push rod 9 passing through the valve body 4. The push rod 9 is the mover 8
A spherical valve closing body 11 is held at the opposite end 10.

The valve body 4 has a cylindrical second extension 14 on the side opposite to the coil 2, which engages and is fixed in the receiving hole 15 of the valve block 16. There is. A thin-walled metal sleeve 17 is inserted into the extension 14 and extends coaxially to the push rod 9. A plate-shaped side wall 18 is received in the sleeve 17 as a valve seat holder. The horizontal wall 18 has a through hole 19,
The through hole is designed as a valve seat 20 of the valve closing body 11 on the push rod side. The plate-shaped side wall 18 is made of steel and can be hardened. A thin plate 21 is arranged on the lower side of the side wall 18, and this plate is connected to the aperture hole 22.
have. This is followed by a ring-shaped spacer plate and a mesh filter plate 24 made of wire mesh or plastic mesh. The transverse wall 18 , the plate 21 , the spacer plate 23 and the mesh filter plate 24 abut each other and rest on a reduced cross-section step 25 of the sleeve 17 , and an annular portion of the sleeve circumferential wall 27 that engages with the transverse wall 18 It is attached liquid-tightly by grooves 26. The sleeve 17 adjoins the step 25 on the side facing away from the push rod into a section 28 of smaller diameter. Furthermore, the sleeve 17 is provided with passage holes for the pressure medium on both sides of the transverse wall 18. The small-diameter section 28 forms a passage hole 29, while a passage hole 30 is punched out in the sleeve peripheral wall 27 on the push rod side. The sleeve 17 together with the elements received and fixed within the sleeve constitutes the second component of the valve 1. After mounting the push rod 9 and return spring 31 and adjusting the air gap, this second component is fixed to the cylindrical extension 14 of the valve body 4 by laser-generated spot welding 32 or beat welding. There is.

The sleeve 17 is connected to the receiving hole 1 of the valve block 16.
5, a position is defined in which the passage hole 29 is assigned to the first pressure medium passage 34 of the valve block and the passage hole 30 is assigned to the second pressure medium passage hole 35. Sleeve 17
A first sealing ring 36 received on the outside of the small diameter section 28 of the through holes 29 and 30 as well as the pressure medium channel 3
It separates 4 and 35. Cylindrical extension 1 of valve body 4
A second sealing ring 37 received in the receiving hole 15 prevents the pressure medium from escaping from the receiving hole 15 . Furthermore, a sleeve filter 38, which is inserted into the sleeve 17 and surrounds the passage hole 30, is provided to collect foreign matter contained in the pressure medium.

In a variant of the illustrated embodiment, depending on the conditions of use of the valve 1, there is only a side wall 18 in the sleeve 17;
Alternatively, only the lateral wall 18 combined with the plate 22 with the throttle hole 22 is inserted.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of an electromagnetic valve according to an embodiment of the present invention.

[Explanation of symbols]

1 valve, 2 coil, 3 yoke,
4 Valve body, 5 Additional part, 6 Capsule,
7 welding seam, 8 mover, 9 push rod, 10 end, 11 valve closing body, 1
4 additional part, 15 receiving hole, 16 valve block, 17 sleeve, 18 side wall, 1
9 through hole, 20 valve seat, 21 plate, 22 throttle hole, 23 spacer plate, 24 mesh filter plate, 25
Stepped portion, 26 grooves, 27 sleeve peripheral wall,
28 division, 29, 30 passage hole, 31 return spring, 32 point welding, 34, 35 pressure medium passage, 36, 37 seal ring, 38
sleeve filter

Claims (4)

[Claims] [Claim 1] An electromagnetic valve (1), comprising a coil (
2), a valve body (4) that supports the mover (8), a push rod (9) that penetrates the valve body (4) and engages with the mover (8);
A valve closing body (
11) and a valve body (4) assigned to the valve closing body (11).
The valve body (4) has a valve seat holder attached directly to the cylindrical extension (14) of the valve body (4).
A thin-walled sleeve (17) extending coaxially with respect to the push rod (9) is inserted into the extension (14) of the valve seat holder as a plate-shaped side wall (18).
17) and the sleeve (17) is received within the lateral wall (
Passage holes (29, 30) for pressure medium on both sides of 18)
An electromagnetic valve characterized by being equipped with. 2. The sleeve (17) has a step (25) reducing the cross section, on which the lateral wall (18) is supported and an annular groove (26) in the sleeve peripheral wall (27).
2. The valve of claim 1, wherein the valve is secured by. 3. A mesh filter plate (24) is provided between the step (25) of the sleeve (17) and the side wall (18).
3. The valve according to claim 2, further comprising a ring-shaped spacer plate (23) and/or a plate (21) with a throttle hole (22). 4. The sleeve (17) has a section (28) with the next smallest diameter next to the step (25), which section has a sealing ring (3) separating the passage hole (29, 30) on the outside.
6). The valve of claim 2, wherein the valve receives: