JPH07269735A - Solenoid valve - Google Patents

Abstract

PURPOSE:To surely prevent fluid out of a valve part from penetrating into a solenoid part by fitting an edge part of a through hole to be formed in the center of a diaphragm, in a ring recess to be formed in the circumference of a centerpiece operating a valve element in a state of being compressed. CONSTITUTION:The circumference of a rubber diaphragm 63 is held between a magnetic guide 57 of a solenoide part 41 and a snout 59 of a valve part 43. A centerpiece 65 consisting of metal, by way of example, is set up in the center of this diaphragm 63. In addition, a ring recess 65a is formed on the circumference of this centerpiece 65. Then, an edge part 63b of a through hole 63a being formed in the center of the diaphragm 63 is fitted in the ring recess 65a of the centerpiece 64 in a state of being compressed. With the constitution, since a fluid out of the valve part is prevented from penetrating into the solenoid part 41 owing to this diaphragm 63, such a possibility that the fluid might be penetrated into the solenoid part is surely preventable from occurring.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid valve used for controlling pressure fluid in automobiles, industrial machines and the like.

[0002]

2. Description of the Related Art Generally, electromagnetic valves are widely used in automobiles, industrial machines, etc. to control a pressure fluid.

FIG. 6 shows a solenoid valve of this type, which is composed of a solenoid portion 11 and a valve portion 13. In the housing 15 of the solenoid part 11,
The exciting coil 17 is housed.

A fixed iron core 19 is provided inside the exciting coil 17.
A movable iron core 23 is movably arranged via a spacer 21 on the valve portion 13 side of the fixed iron core 19.

A coil spring 27, one end of which abuts against the end plate 25, is arranged inside the fixed iron core 19, and the other end of the coil spring 27 urges the movable iron core 23 toward the valve portion 13. There is.

The movable iron core 23 is guided by a magnetic guide 29 on the valve portion 13 side. End surface 15 of housing 15
The snout 31 that constitutes the valve portion 13 is inserted into a,
The tip is in contact with the magnetic guide 29.

A fluid introducing passage 31a and a fluid guiding passage 31b are formed in the snout 31, and a spherical valve element 33 is arranged at a position to block these passages. Also,
A fluid discharge passage 35 is formed in the end surface 15 a of the housing 15.

In the solenoid valve described above, when a current is applied to the exciting coil 17, the exciting coil 17 is excited and the movable iron core 23 is attracted to the fixed iron core 19 against the biasing force of the coil spring 27. Movable iron core 2 for valve body 33
The pressing force of 3 does not work, the valve body 33 moves to the movable iron core 23 side by the pressure of the fluid, the fluid introduction passage 31a opens, and the fluid passes through the fluid guide passage 31b and is discharged from the fluid discharge passage 35.

On the other hand, when the current to the exciting coil 17 is cut off, the exciting coil 17 is no longer excited and the urging force of the coil spring 27 causes the movable iron core 23 to move toward the valve element 33 side. Is closed, and the inflow of fluid from the fluid introduction passage 31a is blocked.

[0010]

However, in such a conventional solenoid valve, the fluid introducing passage 31a of the valve portion 13 is provided.
There is a risk that the fluid that has flowed in from will enter the solenoid unit 11. For example, when controlling a fluid containing a large amount of contaminants such as an automatic transmission of an automobile, the contaminants contained in the fluid are It is sandwiched between the movable iron core 23 and the spacer 21,
There is a problem that malfunction may occur.

Further, there is a problem that impurities may be accumulated between the fixed iron core 19 and the movable iron core 23, the moving amount of the movable iron core 23 may be reduced, and the fluid control characteristics may be deteriorated.

The present invention has been made in order to solve the conventional problems, and an object thereof is to provide a solenoid valve capable of reliably preventing the fluid from the valve section from entering the solenoid section. And

[0013]

According to a first aspect of the present invention, there is provided a solenoid valve having a rubber diaphragm disposed between a solenoid portion and the valve portion for preventing a pressure fluid from flowing from the valve portion to the solenoid portion. The edge portion of the through hole formed in the center of the diaphragm is inserted into an annular recess formed on the outer periphery of the center piece for operating the valve body in a compressed state.

A solenoid valve according to a second aspect is the solenoid valve according to the first aspect.
The center piece and the valve body are integrally formed.

[0015]

In the solenoid valve of the first aspect, the diaphragm prevents the fluid from the valve portion from entering the solenoid portion.

Also, the valve element can be reliably operated by the center piece. Furthermore, since the edge of the through hole formed in the center of the diaphragm is fitted into the annular recess formed in the outer periphery of the center piece in a compressed state, it is possible to reliably seal between the center piece and the diaphragm. .

In the solenoid valve of the second aspect, since the center piece and the valve body are integrally formed, the number of parts is reduced.

[0018]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 shows a first embodiment of a solenoid valve according to the present invention. This solenoid valve is used, for example, for pressure control of an automatic transmission of an automobile, and the solenoid valve of the valve portion is affected by foreign matters in oil. A ball valve system is adopted, which has a structure that causes little sealing failure.

This solenoid valve has a solenoid portion 41 and a valve portion 4
3 and 3. An exciting coil 45 is housed in the housing 44 of the solenoid portion 41.

A fixed iron core 47 is provided inside the exciting coil 45.
A movable iron core 51 is movably arranged via a spacer 49 on the valve portion 43 side of the fixed iron core 47.

Inside the fixed iron core 47, a coil spring 55 is arranged, one end of which abuts against the end plate 53, and the other end of the coil spring 55 urges the movable iron core 51 toward the valve portion 43 side. There is.

The valve portion 43 side of the movable iron core 51 is guided by a magnetic guide 57. End surface 44 of housing 44
The snout 59 which comprises the valve part 43 is inserted in a.

A fluid introduction passage 59a and a fluid guide passage 59b are formed in the snout 59, and the fluid introduction passage 59a is formed.
A spherical valve element 61 is arranged on a valve seat 59c formed at the tip of a.

Further, the end surface 44a of the housing 44 has
A fluid discharge passage 43b is formed. Thus, in this embodiment, the outer circumference of the rubber diaphragm 63 is sandwiched and fixed between the magnetic guide 57 of the solenoid portion 41 and the snout 59 of the valve portion 43.

The diaphragm 63 is made of, for example, a fluorosilicone rubber which does not harden at a low temperature and has oil resistance and high temperature resistance. At the center of the diaphragm 63, a center piece 65 made of, for example, metal is arranged.

The outer periphery of the center piece 65 is shown in FIG.
As shown in, an annular recess 65a is formed. Then, as shown in FIG. 3, the edge portion 63b of the through hole 63a formed at the center of the diaphragm 63 is fitted into the annular recess 65a of the center piece 65 in a compressed state.

In this embodiment, the width W of the annular recess 65a is
Is smaller than the thickness t of the diaphragm 63, and
The outer diameter D of the annular recess 65a is the diaphragm 6 shown in FIG.
3 is larger than the inner diameter d of the through hole 63a.

The diaphragm 63 is attached to the center piece 65 by utilizing the elasticity of rubber. One end of the center piece 65 is in contact with the movable iron core 51, and the other end is in contact with the valve body 61.

In this embodiment, the diaphragm 63
As shown in FIG. 3, a protrusion 63c is formed on the outer circumference of the magnetic guide 57 and the snout 5.
It is sandwiched between 9 and.

In the solenoid valve described above, when a current flows through the exciting coil 45, the exciting coil 45 is excited and the movable iron core 51 resists the urging force of the coil spring 55.
7, the pressing force of the movable iron core 57 against the center piece 65 does not work, the valve body 61 and the center piece 65 move to the movable iron core 51 side by the fluid pressure, and the fluid introduction passage 59a opens. The fluid passes through the fluid guide passage 59b and is discharged from the fluid discharge passage 43b.

On the other hand, when the current to the exciting coil 45 is cut off, the exciting coil 45 is no longer excited and the urging force of the coil spring 55 causes the movable iron core 51 to move to the center piece 6.
The fluid introduction passage 59a is closed by the movement of the center piece 65 and the valve body 61, and the inflow of fluid from the fluid introduction passage 59a is blocked.

In the above-described solenoid valve, however, the diaphragm 63 is arranged between the solenoid portion 41 and the valve portion 43, so that the fluid from the valve portion 43 can enter the solenoid portion 41 by the diaphragm 63. Is blocked,
As a result, it is possible to reliably prevent the fluid from entering the solenoid portion 41.

Therefore, even when controlling a fluid containing a large amount of contaminants such as an automatic transmission of an automobile, the contaminants contained in the fluid may be sandwiched between the movable iron core 51 and the spacer 49. It is possible to surely eliminate the risk that the malfunction will occur.

Further, it is possible to eliminate the possibility that the amount of movement of the movable iron core 51 will not be reduced due to the accumulation of foreign matters between the fixed iron core 47 and the movable iron core 51, and the controllability of the fluid will be deteriorated. it can.

Since the valve body 61 is operated by the hard center piece 65 made of metal with less elastic deformation, the valve body 61 can be operated reliably. Further, since the force of the movable iron core 51 is transmitted to the valve body 61 via the center piece 65, the center piece 6
Even if the center of the valve 5 is displaced, the valve element 61 can be reliably brought into contact with the valve seat 59c, and the sealing failure of the valve portion 43 can be avoided.

Further, the edge 63b of the through hole 63a formed in the center of the diaphragm 63 is attached to the center piece 65.
Since it is fitted in the annular recess 65a formed on the outer periphery thereof in a compressed state, the space between the center piece 65 and the diaphragm 63 can be reliably sealed.

FIG. 5 shows a second embodiment of the solenoid valve of the present invention. The solenoid valve of this embodiment is a proportional valve for controlling the pressure of the control fluid in proportion to the current applied to the exciting coil. It is a solenoid valve.

This solenoid valve includes a solenoid portion 71 and a valve portion 7.
3 and 3. An exciting coil 77 is housed in the housing 75 of the solenoid portion 71.

Inside the exciting coil 77, a movable iron core 79 is provided.
A fixed iron core 81 is arranged, and a magnetic guide 83 is arranged on one side of the movable iron core 79. A through hole 79a is formed in the movable iron core 79, and one side of the shaft 85 is inserted and fixed in the through hole 79a.

The other side of the shaft 85 is inserted into a through hole 81a formed in the fixed iron core 81 and guided to the fixed iron core 81 via a bearing 87. In the figure, reference numeral 89
Shows a snout forming the valve portion 73.

A flange portion 89 is provided on one side of the snout 89.
a is formed, and this flange portion 89a is
It is fixed to the solenoid section 71 side by 5. An inlet port P1, an outlet port P2, and a drain port P3 are formed in the snout 89 in order from the solenoid portion 71 side at predetermined intervals.

Inside the snout 89, a spool 91, which is a valve element that is moved in the axial direction by a solenoid portion 71, is arranged. A female screw portion 93 is formed in the other side opening of the snout 89, and an adjusting screw 95 is screwed into the female screw portion 93.

A coil spring 97 is arranged between the adjusting screw 95 and the spool 91. Thus, in this embodiment, the flange portion 81b of the fixed iron core 81 of the solenoid portion 71 and the flange portion 89a of the snout 89 of the valve portion 73.
The outer periphery of the rubber diaphragm 63A is sandwiched and fixed between the and.

A center piece 65A is arranged in the center of the diaphragm 63A as in the first embodiment.
An edge of a through hole formed in the center of the diaphragm 63A is fitted in a compressed state in an annular recess formed on the outer periphery of the center piece 65A.

In the solenoid valve described above, when the exciting coil 77 is energized, the fixed iron core 81 is excited in proportion to the magnitude of the current, and the movable iron core 79 is attracted to the fixed iron core 81, thereby fixing the movable iron core 79 to the movable iron core 79. The shaft 85 moves the spool 91 to the adjusting screw 95 side through the center piece 65A against the biasing force of the coil spring 97, and opens and closes the inlet port P1 and the drain port P3 formed in the snout 89. In this way, the pressure of the fluid is controlled to a pressure proportional to the current.

In the above solenoid valve, however, the diaphragm 63A is arranged between the solenoid portion 71 and the valve portion 73, so that the fluid from the valve portion 73 can enter the solenoid portion 71 by the diaphragm 63A. Is prevented, and as a result, it is possible to reliably prevent the fluid from entering the solenoid portion 71.

Therefore, when controlling a fluid containing a large amount of contaminants such as an automatic transmission of an automobile, the contaminants contained in the fluid will not be caught in the bearing 87, resulting in malfunction. The fear can be surely eliminated.

Further, a spool 9 which is a valve body is provided by a hard center piece 65A made of metal with a small elastic deformation.
Since 1 is operated, the spool 91 can be operated reliably.

In the embodiment described above, the center piece 65 and the valve body 61, and the center piece 65A and the spool 91 are separate bodies, but the present invention is not limited to this embodiment. Alternatively, the center piece and the valve body or the spool may be integrally formed. In this case, the number of parts can be reduced.

Further, in the above-mentioned embodiment, an example in which the center pieces 65, 65A are made of metal in order to obtain hardness and toughness has been described, but the present invention is not limited to this embodiment. For example, synthetic resin such as PPS may be used.

[0051]

As described above, in the solenoid valve according to the first aspect of the present invention, the diaphragm prevents the fluid from the valve portion from entering the solenoid portion, so that the fluid is surely prevented from entering the solenoid portion. Can be prevented.

Further, since the valve element is operated by the center piece, the valve element can be reliably operated,
Furthermore, since the edge of the through hole formed in the center of the diaphragm is inserted into the annular recess formed in the outer periphery of the center piece in a compressed state, it is possible to reliably seal between the center piece and the diaphragm. .

In the solenoid valve of the second aspect, since the center piece and the valve body are integrally formed, there is an advantage that the number of parts can be reduced.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of a solenoid valve according to the present invention.

FIG. 2 is a perspective view showing the center piece of FIG.

3 is a cross-sectional view showing the diaphragm and the center piece of FIG.

4 is a top view showing the diaphragm of FIG. 1. FIG.

FIG. 5 is a sectional view showing a second embodiment of the solenoid valve of the present invention.

FIG. 6 is a sectional view showing a conventional solenoid valve.

[Explanation of symbols]

 41, 71 Solenoid part 43, 73 Valve part 61 Valve body 63, 63A Diaphragm 63a Through hole 63b Edge part 65, 65A Center piece 65a Annular recess 91 Spool (valve body)

Claims (2)

[Claims] 1. A rubber diaphragm, which blocks the inflow of pressure fluid from the valve portion to the solenoid portion, is arranged between the solenoid portion and the valve portion, and an edge of a through hole formed in the center of the diaphragm. An electromagnetic valve, wherein the portion is fitted in an annular recess formed in the outer periphery of a center piece for operating the valve body in a compressed state. 2. The solenoid valve according to claim 1, wherein the center piece and the valve body are integrally formed.