JPH1172177A - Solenoid valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high quality solenoid valve which can prevent the deterioration in performance by influence of foreign matter in fluid. SOLUTION: A passage 10 is arranged between an outer peripheral surface of an adjusting screw 22 and an inner peripheral surface of a center post 2, and a groove is also arranged in a shim 17, and fluid flowing in from an inflow port 8 arranged in a port part 4 flows out to the center post 2 side along an outer periphery of a plunger 6, and is discharged outside a solenoid valve by passing through the groove of the shim 17 and the passage 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a solenoid valve for controlling a fluid.

[0002]

2. Description of the Related Art Conventionally, there is a solenoid valve as this type of solenoid valve as shown in FIG. FIG.
(A) is a sectional view showing a schematic structure of the solenoid valve 100, and (b) is an enlarged view of a D1 portion thereof.

The solenoid valve 100 includes a coil 105
The spring 1
By sucking the plunger 106 toward the center post 104 against the urging force of 25, the outflow ports 155 and 156 communicating with the inflow port 148 are opened to control the flow rate or pressure.

When such a solenoid valve 100 is used in a place such as an automatic transmission (AT) of an automobile where a large amount of foreign matter such as metal abrasion powder or dust called structurally contaminated is generated, the inside of the solenoid is required. As a measure to prevent the accumulation of such foreign matter in the air, it was necessary to provide an oil passage inside.

Accordingly, in this solenoid valve 100, as shown in the figure, a drain port 123 is provided at the axis of the adjusting screw 120 so as to penetrate in the axial direction.

In the solenoid valve 100, the center post 104 is used to make the attraction force characteristic proportional to the current.
The inner peripheral surface 126 of the suction portion 114 is formed as a tapered surface whose diameter increases toward the plunger 106, and the plunger 1
06, the outer peripheral surface 132 at the end on the side of the center post 104,
Center post 104 fitted to the tapered surface of suction section 114
The side has a tapered surface with a reduced diameter.

Further, in order to control the solenoid valve 100 in a proportional manner, it is necessary to keep the inner peripheral surface 126 of the center post 104 and the outer peripheral surface 132 of the plunger 106 at a predetermined distance or more.

For this reason, a shim 128 is provided between the center post 104 and the plunger 106 as a space regulating member made of a non-magnetic material.

The shim 128 has a substantially cylindrical shape, is fitted into a concave portion 127 provided at the inner diameter side end of the inner peripheral surface 126 of the suction portion 114 of the center post 104, and is provided so as to protrude in the axial direction. . In particular, at extremely low temperatures (-30 ° C to 0 ° C
When the shim 128 comes into contact with the plunger 106 due to an increase in the viscosity of the oil, the plunger 106 is adsorbed and hysteresis occurs. Therefore, by making the shim 128 cylindrical, the contact area with the plunger 106 is reduced. ing.

[0010]

However, in the solenoid valve 100 having the conventional configuration, there is a portion where the contamination easily adheres locally in the oil passage flowing from the inflow port 148 and flowing out to the drain port 123.

In particular, as shown in an enlarged scale in FIG.
The amount of adhesion was large between the tapered surface of the plunger 106 and the side surface (A and A 'in the figure) and the spring winding (B in the figure) near the plunger tip.

[0012] These points are portions where the flow channel area increases rapidly, and where stagnation (vortex) occurs. In particular, in part A, a large amount of magnetic contamination was attached due to the magnetic force acting on the plunger.

As described above, the foreign matter made of a magnetic material is
When the suction portion 132 is sucked, the shape of the suction portion changes and the clearance between the suction portion 132 and the center post 104 becomes small, so that the suction force increases, the control characteristics change, and the durability decreases. was there.

Further, if contaminants adhere between the windings B of the spring 125, the elasticity of the spring 125 becomes a resistance at the time of expansion and contraction, which impairs the responsiveness of the plunger 106.

The present invention has been made in order to solve the problems of the prior art, and an object of the present invention is to provide a highly reliable solenoid valve capable of preventing a decrease in performance due to the influence of foreign matter in a fluid. To provide.

[0016]

In order to achieve the above object, according to the present invention, there is provided a cylindrical center post excited by a coil, and a port portion provided at a predetermined distance axially from the center post. A plunger chamber formed between the center post and the port portion, through which a fluid to be controlled flows, a plunger accommodated in the plunger chamber so as to be movable in the axial direction, and Biasing means for biasing the plunger, and biasing force adjusting means fitted in the hollow portion of the center post and adjusting the biasing force applied to the plunger by changing the axial position while contacting the biasing means. And an interval restricting member that restricts a minimum distance by contacting the opposite ends of the center post and the plunger when the plunger moves to the center post side. A solenoid valve that moves a plunger in accordance with the amount of electricity supplied to the coil to control a fluid flowing through a port, wherein a first flow path along the outer periphery of the plunger and a hollow portion of the center post are provided. A second flow path provided between the first flow path and the urging force adjusting means; and a first flow path and a second flow path that are cut off by the gap regulating member when the plunger moves toward the center post. And a third flow path for communicating with the third channel.

Accordingly, the fluid flowing into the plunger chamber is transferred from the first flow path along the outer periphery of the plunger to the second flow path provided between the hollow portion of the center post and the urging force adjusting means. Since it flows out and is discharged out of the solenoid valve, it can flow almost linearly in its flow path without suddenly changing its traveling direction, preventing stagnation and vortices from occurring, and preventing local contamination. Can be prevented.

When the plunger moves to the center post side, even if the space regulating member cuts off the first flow path and the second flow path, the fluid that has flowed into the plunger chamber through the third flow path. It is possible to communicate from the first flow path to the second flow path.

Further, it is preferable that the gap regulating member is an annular member through which the urging means is inserted, and the third flow path is a groove formed in the gap regulating member.

According to this configuration, the fluid directed toward the urging means is suppressed by the annular space regulating member, and even if the space regulating member shuts off the first flow path and the second flow path, the center post side is closed. The groove formed at the end of the plunger functions as a third flow path to allow the fluid flowing into the plunger chamber to flow from the first flow path to the second flow path.

It is also preferable that the biasing force adjusting means is an adjusting screw which is moved in an axial direction by a screw provided in a hollow portion of the center post.

This makes it possible to adjust the biasing force of the biasing means after the solenoid valve is assembled.

Further, it is preferable that the gap regulating member is attached to the plunger.

This makes it possible to reduce the amount of fluid flowing into the urging means, and to prevent contamination from adhering to the urging means.

A cylindrical center post excited by a coil, a port portion provided at a predetermined distance in the axial direction from the center post, and a fluid formed between the center post and the port portion to be controlled. The inflow plunger chamber, the plunger accommodated in the plunger chamber so as to be movable in the axial direction, and when the plunger moves to the center post side, the plunger is brought into contact with mutually facing ends of the center post and the plunger. An interval regulating member that regulates the minimum interval by moving the plunger in accordance with the amount of current supplied to the coil to control the fluid flowing through the port portion, and to the hollow portion of the center post through the outer periphery of the plunger. In the solenoid valve capable of discharging a fluid through a flow path connected to the solenoid valve, the interval regulating member is a non-magnetic material, Wherein the fully covers at least one-way opposing surface of Ntaposuto the plunger.

[0026] This prevents the magnetic contamination from adhering to the non-magnetic member interval regulating member.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. The dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention to them unless otherwise specified. Absent.

(First Embodiment) FIG. 1 shows a first embodiment of the present invention.
1 shows a solenoid valve 1 according to the embodiment.

That is, the solenoid valve 1 includes a center post 2, a coil 3 provided to surround the center post 2, and a port portion 4 provided at a predetermined distance from the center post 2 in the axial direction. Have.

A hollow plunger chamber 5 is formed by the inner peripheral surface of the coil 3 and the opposing surfaces of the center post 2 and the port 4.
The plunger 6 is inserted into the plunger chamber 5 so as to be movable in the axial direction. A spring 7 as an urging means is mounted between the plunger 6 and the center post 2, and the plunger 6 is pressed against the port portion 4 by the spring force of the spring 7.

The port portion 4 is provided with an inflow port 8 penetrating in the axial direction, a first outlet 9 is provided at the base of the port portion 4, and the center post 2 has a second flow path. The second outlet 10 is provided.

The center post 2 is provided with a through hole 21 penetrating in the center axis direction.
An adjusting screw 22 as an urging force adjusting means for adjusting the set load is press-fitted and fitted along the outer peripheral surface of the adjusting screw 22 along with the second outlet 1.
0 is formed.

One end of the spring 7 is engaged with an end of the adjusting screw 22 facing the plunger chamber 5.

The end face of the center post 2 facing the plunger chamber 5 has a tapered surface that gradually projects from the vicinity of the center toward the outer diameter end toward the plunger chamber, and as a whole, the plunger 6 faces the center post 2. The shape corresponds to the shape of the tip. The end face of the center post 2 faces the tip of the cylindrical portion 11a of the lower plate 11 forming a magnetic path at a predetermined interval in the axial direction.

The coil 3 has a structure in which the coil 32 is wound around the bobbin 31. The center post 2 is fitted on the inner periphery of the upper half of the bobbin 31, and the lower half is the plunger chamber 5.
The port 4 is provided so as to close the lower end opening of the coil 3.

The lower plate 11 is in contact with the lower end surface of the coil 3. The lower plate 11 has a cylindrical shape with a flange. The flange portion 11b is in contact with the lower end surface of the coil 3 and the cylindrical portion 11a is embedded in the inner periphery of the bobbin 31 of the coil 3.

The inner periphery of the cylindrical portion 11a of the lower plate 11 is covered with a thin resin portion 4a. Bobbin 3 above
1. The thin resin part 4a and the port part 4 are the lower plate 1.
1 is integrally molded.

The upper end of the center post 2 has a coil 3
Of the center post 2
An inner diameter end of an annular upper plate 12 serving as a yoke forming a magnetic path is fixed at an upper end portion.

A connector 13 is interposed between the upper plate 12 and the coil 3. A socket portion 14 provided with a terminal 14a is connected to the connector portion 13,
A lead wire (not shown) extending from the coil 3 is embedded in the connector portion 13.

The coil 3 is accommodated in the case 15, the outer diameter end of the upper plate 12 is fitted and fixed in the upper end opening of the case 15, and the lower plate 1 is fitted in the lower end opening of the case 15.
The outer diameter end of the first flange portion 11b is fitted and fixed.
Thereby, the magnetic circuit H when the coil 3 is excited is formed so as to return to the center post 2 through the center post 2, the plunger 6, the lower plate 11, the case 15, and the upper plate 12.

A stepped cylindrical sleeve 16 as a bearing member for guiding the plunger 6 slidably in the axial direction is provided on the inner periphery of the coil 3. The sleeve 16 is made of a non-magnetic material. The sleeve 161 is disposed on the inner periphery of the lower half of the plunger chamber 5 via a predetermined gap g. 4 inlets 8
And a fitting cylinder portion 162 fitted on the inner periphery, and a communication hole 163 is provided at a lower end portion of the bearing portion 161.

The plunger 6 is located above the upper end of the bearing portion 161 of the sleeve 16 and has a diameter larger than the inner diameter of the bearing portion 161 and smaller than the inner diameter of the coil 3.
A large-diameter portion 61 forming a predetermined gap with the inner periphery, a slide portion 62 extending downward from the lower end of the large-diameter portion 61 and slidably contacting the inner periphery of the bearing portion 161; A small-diameter portion 63 having a small diameter and extending further downward from the lower end of the slide portion 62 and facing the communication hole 163 opening to the lower portion of the bearing portion 161, and extending further downward from the lower end of the small-diameter portion 63 to the inside of the inlet 8 of the port portion 4 A cylindrical valve portion 64 is slidably inserted in the periphery, and an opening hole 65 is provided in the side wall of the cylindrical valve portion 64 as an opening partially opened.

The opening 65 of the cylindrical valve portion 64 is a round hole, and a plurality of holes are provided in the circumferential direction. When no current is supplied, the upper end of the opening 65 and the upper end of the cylindrical valve portion 64 are positioned. An overlap portion 66 is provided between the sleeve 16 and the sleeve 16 so as to be in close contact with the inner periphery of the fitting tube portion 162 and close the opening 65.

If the overlap portion 66 is too large, the stroke until opening becomes long, and the control pressure does not decrease easily even if the current is increased. Therefore, it is desirable to make the size as small as possible as long as the sealing property can be ensured.

A gap is formed between the outer peripheral surface of the plunger and the resin portion 4a, and serves as a first flow path for guiding the fluid flowing from the inflow port 8 toward the center post.

The port portion 4 has an insertion tube portion 41 projecting below the lower end surface of the coil 3, and the inflow port 8 is formed through the insertion tube portion 41. A seal member 42 such as an O-ring for sealing a fitting portion with the mounting hole 30 is mounted on the outer periphery of the insertion tube portion 41.

A retaining ring 43 is mounted on the outer periphery of the lower end of the fitting tube 162 of the sleeve 16 fitted on the inner periphery of the insertion tube 41 to prevent the sleeve 16 from coming off to the plunger chamber 5 side. . The retaining ring 43 is formed integrally with the port portion 4, and the lower end of the fitting tubular portion 162 of the sleeve 16 is fixed by caulking.

Next, the second outlet and the shim, which are characteristic parts of the present invention, will be described in detail with reference to FIG.

FIG. 2 is an enlarged view of the vicinity of the shim in FIG.

At the end of the plunger 6 on the side of the center post 2, a shim 17 as a space-regulating member made of a non-magnetic material having an annular substantially truncated cone shape is mounted. When the plunger 6 is sucked toward the center post 2, the shim 17 contacts the center post 2, and the gap between the plunger 6 and the center post 2 is regulated so as not to be in close contact with each other. The suction force between the center post 2 and the center post 2 can always be proportionally controlled.

An axial through hole is provided in the axial center portion of the shim 17, and the spring 7 is inserted into the through hole 17a. The shim 17 has a large diameter portion 17a and a small diameter portion 17b.
The small-diameter portion 17b extends in the axial direction and protrudes so as to surround the through-hole.
Are fitted in a concave portion 67 formed in the inner peripheral surface at the tip of the large diameter portion 61 of the plunger 6.

On the other hand, a groove 17c as a third flow path is formed at the large-diameter end of the shim 17, so that even when the shim 17 and the center post 2 are in contact with each other, the shim 17 flows through the inflow port 8,
The first flow path along the outer peripheral surface of the plunger communicates with the second outlet 10 as the second flow path.

Thus, irrespective of the position of the plunger 6, the fluid flowing from the inflow port 8 takes a substantially linear flow path and is discharged from the center post 2 side, so that stagnation does not occur in the flow path. Therefore, adhesion of contamination can be prevented.

Since the groove 22 a is formed in the outer peripheral portion of the adjusting screw 22 and the second outlet 10 is provided between the adjusting screw 22 and the center post 2, the fluid flowing along the outer peripheral surface of the plunger 6 is Without flowing into the interior of the
Since the fluid is discharged to the outside of the solenoid valve 1 through the outflow port 10, there is no contamination between the windings of the spring 7.

Further, even in a portion which is excited by the coil and has an attraction force, by securing a sufficient flow path, self-cleaning becomes possible by the flow of oil, thereby preventing the adhesion of magnetic contamination.

The material of the shim is a non-magnetic material as long as it operates and satisfies the durability against thermal shock.
303, 304), copper, brass, resin and the like.

When the adjustment of the spring 7 after assembly is unnecessary, an adjusting pin can be used instead of the adjusting screw 22. In this case, it is necessary to accurately set the adjustment pin fixing position so that the biasing force of the spring 7 becomes a predetermined amount at the time of assembly.

(Second Embodiment) FIG. 3 is an enlarged view of the vicinity of a shim of a solenoid valve according to a second embodiment of the present invention.

In the first embodiment, the shim 1
Although 7 is attached to the end of the plunger 6 on the center post 2 side, in the present embodiment, it is attached to the end of the center post 2 on the plunger 6 side in the same manner as in the related art.

However, a groove 17c is provided on the outer diameter side of the shim 17 so that the fluid flowing along the outer peripheral surface of the plunger 6
Care is taken to flow smoothly to the second outlet 10 without stagnation.

Even in such a configuration, since the fluid flows without stagnation, it is possible to prevent local adhesion of contaminants.

Since other structures and operations are the same as those of the first embodiment, the same components are denoted by the same reference numerals and description thereof will be omitted.

(Third Embodiment) FIG. 5 shows a third embodiment of the present invention.
2 shows a solenoid valve 201 according to the embodiment.

That is, the solenoid valve 201
Includes a center post 202, a coil 203 provided to surround the center post 202, and a port 204 provided at a predetermined distance from the center post 202 in the axial direction.

A hollow plunger chamber 205 is formed by the inner peripheral surface of the coil 203 and the opposing surfaces of the center post 202 and the port portion 204.
A plunger 206 is inserted movably in the axial direction.

A spring 207 as an urging means is mounted between the plunger 206 and the center post 202, and the plunger 206 is pressed against the port 204 by the spring force of the spring 207.

The port portion 204 is provided with an inlet 208 penetrating in the axial direction, a first outlet 209 is provided at the base of the port portion 204, and a second flow passage is provided in the center post 202. A second outlet 210 is provided.

The center post 202 is provided with a through hole 221 penetrating in the center axis direction, and an adjust screw 222 as an urging force adjusting means for adjusting a set load of the spring 207 is fitted in the through hole 221.

One end of a spring 207 is engaged with an end of the adjusting screw 222 facing the plunger chamber 205.

The plunger chamber 205 of the center post 202
Has a tapered surface that gradually projects toward the plunger chamber 205 from the vicinity of the center toward the outer diameter end.

The end face of the center post 202 faces the tip of the cylindrical portion 211a of the lower plate 211 forming the magnetic path at a predetermined interval in the axial direction.

The coil 203 is attached to the bobbin 231
2 and the center post 202 is a bobbin 2
31 is fitted on the inner periphery of the upper half, and the lower half is the plunger chamber 2.
The port portion 204 is provided so as to close the lower end opening of the coil 203.

A lower plate 2 is provided on the lower end surface of the coil 203.
11 is in contact. The lower plate 211 has a cylindrical shape with a flange, a flange portion 211b abuts on a lower end surface of the coil 203, and the cylindrical portion 211a is a bobbin 2 of the coil 203.
31 is embedded in the inner circumference.

The cylindrical portion 211 of the lower plate 211
The inner circumference of “a” is covered with a thin resin portion 204a. The bobbin 231, the thin resin portion 204a, and the port portion 20
4 is integrally formed by inserting a lower plate 211.

The upper end of the center post 202 projects further upward from the upper end of the coil 203, and the inner end of an annular upper plate 212 serving as a yoke forming a magnetic path is fixed to the upper end of the center post 202. I have.

A connector 213 is interposed between the upper plate 212 and the coil 203. The connector portion 213 has a socket portion 21 provided with a terminal 214a.
4 are connected, and a lead wire (not shown) extending from the coil 203 is embedded in the connector portion 213.

The coil 203 is housed in the case 215, and the upper plate 212
The outer diameter end of the lower plate 211 is fitted and fixed to the lower end opening of the case 215. Accordingly, the magnetic circuit H when the coil 203 is excited is formed so as to return to the center post 202 through the center post 202, the plunger 206, the lower plate 211, the case 215, and the upper plate 212.

A stepped cylindrical sleeve 216 as a bearing member for guiding the plunger 206 slidably in the axial direction is provided on the inner periphery of the coil 203. Sleeve 2
A bearing portion 216a is made of a non-magnetic material, and is disposed on a lower half inner periphery of the plunger chamber 205 with a predetermined gap g therebetween.
A fitting cylindrical portion 216b extending downward from the lower end of the bearing portion 216a via the step portion and fitted to the inner periphery of the inflow port 208 of the port portion 204, and communicates with the lower end portion of the bearing portion 216a. A hole 216c is provided.

The plunger 206 is connected to the sleeve 216.
Is located above the upper end of the bearing portion 216a of the
6a, a large diameter portion 206a having a diameter larger than the inner diameter of the coil 203 and having a smaller diameter than the inner diameter of the coil 203 to form a predetermined gap between the inner periphery of the coil 203, and a bearing portion extending downward from the lower end of the large diameter portion 206a. A sliding portion 206b slidably in contact with the inner periphery of the sliding portion 206b; and a bearing portion 216 having a smaller diameter than the sliding portion 206b and extending further downward from the lower end of the sliding portion 206b.
a Small diameter portion 206 facing communication hole 216c opening at the bottom
c, and a cylindrical valve portion 206d extending downward from the lower end of the small diameter portion 206c and slidably inserted into the inner periphery of the inflow port 208 of the port portion 204. An opening hole 206e is provided as an opening that partially opens.

The opening hole 206 of this cylindrical valve portion 206d
e is a round hole, and a plurality of holes are provided in the circumferential direction. When no current is supplied, the upper end of the opening hole 206e and the cylindrical valve portion 2
06d between the upper end of the sleeve 216 and the upper end of the sleeve 216.
An overlapping portion 206f that closes the opening hole 206e in close contact with the inner circumference of the opening 06b is provided.

If the overlap portion 206f is too large, the stroke before opening becomes long, and even if the current increases, the control pressure does not decrease easily. When the control pressure starts to decrease, the control pressure suddenly decreases and the proportionality with the current is lost. Therefore, it is desirable to make the size as small as possible as long as the sealing property can be ensured.

The outer peripheral surface of the plunger and the resin portion 204a
A gap is formed between the center post and the first post to guide the fluid flowing from the inflow port 208 toward the center post.

The port portion 204 has an insertion tube portion 241 projecting below the lower end surface of the coil 203.
The inflow port 8 is formed through the insertion tube portion 241. A seal member 242 such as an O-ring for sealing the fitting portion with the mounting hole 230 is mounted on the outer periphery of the insertion tube portion 241.

A stopper ring 243 is attached to the outer periphery of the lower end of the fitting tube 206b of the sleeve 216 fitted to the inner periphery of the insertion tube 241 to prevent the sleeve 216 from coming off to the plunger chamber 205 side. . The retaining ring 243 is integrally formed with the port portion 204,
The lower end of the fitting tube 206b of the sleeve 216 is fixed by caulking.

Next, the shim 217 as a space regulating member, which is a characteristic part of the present invention, will be described in detail with reference to FIG.

The shim 217 is made of a non-magnetic material.
Magnetic contamination is prevented from adhering. Sim 2
No. 17 does not have a circumferential groove or the like formed on the inner peripheral surface 217a so that the fluid flows smoothly from the outer peripheral side of the plunger 206. Further, the outer peripheral surface 217b has a shape following the end surface of the center post 202 which is tapered to perform the proportional control operation and covering almost the entire surface thereof.

The center post 2 is located above the outer peripheral surface 217b.
02 is provided with a cylindrical portion 217c fitted into the opening 202a.

The inner peripheral surface 217a has a substantially tapered shape similarly to the outer peripheral surface 217b, and an annular seating surface 217d is formed at a position where the tip of the plunger 206 contacts.

By providing such a shim 217, it is possible to suppress the magnetic contaminant from adhering to the shim 217, and to stabilize the control characteristics of the solenoid valve 201 for a long period of time.

FIG. 7 shows the center post 202 of the shim 217.
The gap between the side end 217e and the tapered step 202b of the center post 202 is eliminated.
Eliminating gaps and steps that may inhibit the smooth flow of the fluid as much as possible is also effective in preventing foreign matter from adhering.

The same effect can be obtained by providing a shim having the same configuration as that of the shim 217 on the end face of the plunger 206 on the center post 202 side.

As the material of the shim 217, for example, an aluminum alloy, a resin material, a non-magnetic stainless material, or the like can be used.

[0093]

According to the present invention, the fluid flowing from the port into the plunger chamber is forced from the first flow path along the outer periphery of the plunger to the hollow portion of the center post via the third flow path. Since it flows out to the second flow path provided between the adjusting means and is discharged out of the solenoid valve, it can flow almost linearly in the flow path without suddenly changing the traveling direction. In addition, it is possible to prevent stagnation and vortices from occurring, prevent local adhesion of foreign matters, prevent performance degradation due to the influence of foreign matters in the fluid, and improve the reliability of the solenoid valve.

[0094] By forming the annular spacing regulating member through which the urging means is inserted, the fluid flowing from the first flow path to the urging means is suppressed, and foreign matter adhesion to the urging means is reduced.
Even if the gap regulating member blocks the first flow path and the second flow path, the groove formed becomes the third flow path, and the fluid flowing into the plunger chamber is transferred from the first flow path to the second flow path. It can be communicated to the road.

By using an adjusting screw as the urging force adjusting means, it becomes possible to adjust the urging force of the urging means after assembling the solenoid valve.

By attaching the space regulating member to the plunger, the fluid flowing into the urging means can be reduced, and foreign matter can be prevented from adhering to the urging means. The spacing member is made of a non-magnetic material, and by covering at least one of the opposing surfaces of the center post and the plunger, adhesion of magnetic contamination to the plunger or the center post is suppressed. It is possible to prevent a decrease in performance and improve the reliability of the solenoid valve.

[Brief description of the drawings]

FIG. 1 is a sectional configuration explanatory view of a solenoid valve according to a first embodiment.

FIG. 2A is an enlarged view of a main part of FIG. 1, and FIG. 2B is a perspective view of a shim according to the first embodiment.

FIG. 3 is an enlarged view of a main part of a solenoid valve according to a second embodiment of the present invention.

FIG. 4A is a cross-sectional configuration explanatory view of a conventional solenoid valve, and FIG. 4B is an enlarged view of a main part thereof.

FIG. 5 is a sectional configuration explanatory view of a solenoid valve according to a third embodiment of the present invention.

FIG. 6 is an enlarged view of a shim of a solenoid valve according to a third embodiment of the present invention.

FIG. 7 is an enlarged view of a main part of a solenoid valve according to a third embodiment of the present invention.

[Explanation of symbols]

 1,201 Solenoid valve 2,202 Center post 202a Opening hole 202b Tapered step 21,221 Through hole 22,222 Adjust screw 3,203 Coil 31,231 Bobbin 32,232 Coil 4,204 Port 4a, 204a Thin wall Resin part 41,241 Inserting cylinder part 42,242 O-ring 43,243 Retaining ring 5,205 Plunger chamber 6,206 Plunger 61,206a Large diameter part 62,206b Slide part 63,206c Small diameter part 64,206d Cylindrical valve Portion 65, 206e Opening hole 66, 206f Overlap portion 7, 207 Spring 8, 208 Inlet 9, 209 First outlet 10, 210 Second outlet 11, 211 Lower plate 11a, 211a Cylindrical portion 11b, 211b Flange portion12, 212 Upper plate 13, 213 Resin molded part 14, 214 Socket part 14a, 214a Terminal 15, 215 Case 16, 216 Sleeve (bearing member) 161, 216a Bearing part 162, 206b Fitting cylinder part 163, 216c Communication hole 17 , 217 Shim 217a Inner peripheral surface 217b Outer peripheral surface 217c Cylindrical part 217d Seat 217e End 30 Mounting hole

Claims (5)

[Claims] A cylindrical center post excited by a coil; a port provided at a predetermined distance in the axial direction from the center post; and a port formed between the center post and the port.
A plunger chamber into which a fluid to be controlled flows, a plunger accommodated in the plunger chamber so as to be movable in the axial direction, an urging means for urging the plunger toward the port, and a hollow portion of the center post. An urging force adjusting means fitted to the urging means to adjust an urging force applied to the plunger by changing an axial position while abutting on the urging means; and A gap regulating member that regulates a minimum gap by contacting opposite ends of the post and the plunger; and a solenoid valve that moves the plunger according to the amount of electricity supplied to the coil to control fluid flowing through the port. A first flow path along an outer periphery of the plunger; and a second flow path provided between a hollow portion of the center post and an urging force adjusting unit. When the plunger moves to the center post side, a third flow path for communicating the first flow path and the second flow path, which is cut off by the space regulating member, is provided. Solenoid valve. 2. The space regulating member is an annular member through which the urging means is inserted, and the third flow path is a groove formed in the space regulating member. 2. The solenoid valve according to 1. 3. The solenoid according to claim 1, wherein said biasing force adjusting means is an adjusting screw which is moved in an axial direction by a screw provided in a hollow portion of said center post. valve. 4. The solenoid valve according to claim 1, wherein the gap regulating member is attached to the plunger. 5. A cylindrical center post excited by a coil, a port provided at a predetermined distance in the axial direction from the center post, and a port formed between the center post and the port.
A plunger chamber into which a fluid to be controlled flows, a plunger accommodated in the plunger chamber so as to be movable in the axial direction, and ends of the center post and the plunger facing each other when the plunger moves toward the center post. A gap regulating member that regulates a minimum gap by contacting the center post, the plunger is moved in accordance with the amount of electricity supplied to the coil, the fluid flowing through the port is controlled, and the center post passes through the outer periphery of the plunger. In the solenoid valve, the fluid can be discharged by a flow path connected to the hollow portion of the solenoid valve, wherein the interval regulating member is a non-magnetic material, and covers at least one of the opposing surfaces of the center post and the plunger. A solenoid valve characterized by the following.