JPH08210543A - Solenoid and manufacture thereof - Google Patents

Abstract

PURPOSE: To simplify a device structure and reduce the number of part items so as to facilitate production. CONSTITUTION: In a solenoid provided with a solenoid main body 1A having a guide hole 4 inside, a movable member 6 which is made of magnetic material and is inserted freely reciprocatably in the guide hole 4 in the solenoid main body 1A via a bearing 5 with the predetermined length, and a fixed member 7 which is made of magnetic material and is arranged coaxially and opposedly to the movable member 6, an end part 51 on the fixed member 7 side in the bearing 5 is arranged between the fixed member 7 and the movable member 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid used for, for example, a solenoid valve and a method for manufacturing the solenoid.

[0002]

2. Description of the Related Art A conventional solenoid of this type is shown in FIG. That is, this solenoid 100 is a solenoid valve 101 as shown in FIG.
And is provided integrally with the valve body 102.

The solenoid 100 has a guide hole 10 inside.
Solenoid body 100A having 3 and guide hole 103
Plunger 105 as a magnetic movable member that is reciprocally inserted into a shaft via a sleeve 104 that is a bearing.
And the guide hole 10 coaxially facing the plunger 105.
A center post 106 as a fixing member made of a magnetic material, which is partially fixed inside 3 via a sleeve 104, and a direction provided between the center post 106 and the plunger 105 to separate the plunger 105 from the center post 106, that is, a valve. A spring 107 is provided as a pressing unit that presses the valve seat 108 of the main body 102.

When the solenoid main body 100A is not energized, the plunger 105 is pressed by the spring force of the spring 107, and its tip comes into contact with the valve seat 108 of the valve main body 102. 109 is closed.

On the other hand, when the solenoid body 100A is energized, the plunger 105 is magnetically attracted to the center post 106 side against the spring force of the spring 107, so that the plunger 105 is separated from the valve seat 108 and the flow path 1
09 will be opened.

The plunger 105 is the center post 10.
When magnetically attracted to 6, the plunger 105
However, the shim 110 is usually provided in order to prevent the adhesion.

As described above, the solenoid 100 has the plunger 105 when the solenoid body 100A is energized / de-energized.
Since the flow path 109 that opens to the valve seat 108 is opened and closed by making a stroke, the accuracy of the stroke of the plunger 105 is required.

[0008]

Therefore, in the prior art, by strictly controlling the accuracy of each component,
The stroke is adjusted, or as shown in FIG. 3, a threaded portion 111 is provided between the outer peripheral surface of the center post 106 and the inner peripheral surface of the guide hole 103, and the center post 106 is screwed through the threaded portion 111. Then, the center post 106
It is necessary to provide a stroke adjusting mechanism for adjusting the stroke of the plunger 105 by adjusting the distance between the plunger 105 and the plunger 105. That is, there is a problem that the manufacturability is poor and the device structure is complicated.

On the other hand, it is necessary to incorporate the shim 110 for preventing the magnetic attraction portion from adhering and the sleeve 104 which is a bearing, which causes a problem that the number of parts is large and the manufacturing is complicated.

The present invention has been made in order to solve the above-mentioned problems of the prior art. The purpose of the present invention is to simplify the structure of the device and reduce the number of parts to facilitate the manufacture. (EN) Provided is a solenoid that can be manufactured and a manufacturing method thereof.

[0011]

In order to achieve the above object, according to the present invention, a solenoid body having a guide hole inside and a bearing having a predetermined length in the guide hole of the solenoid body are used. A movable member made of a magnetic material that is reciprocally inserted into the movable member, and a fixed member made of a magnetic material that is provided coaxially to face the movable member.
The end of the bearing on the fixed member side is interposed between the fixed member and the movable member.

According to the manufacturing method, a movable member made of a magnetic material is reciprocally inserted into a guide hole of a solenoid body having a guide hole therein through a bearing having a predetermined length, and the movable member is reciprocally moved. In the method of manufacturing a solenoid by inserting and fixing a fixing member made of a magnetic material in the guide hole so as to face the fixing hole, when fixing the fixing member into the guide hole, the fixing member is applied to the tip of the bearing and then fixed. It is characterized in that the member is pushed in and the end portion of the bearing is crimped and bent so that the end portion is interposed between the fixed member and the movable member.

[0013]

In the solenoid having the above structure, the end of the bearing having the predetermined length on the fixed member side is interposed between the fixed member and the movable member. Therefore, the movement of the movable member is restricted. In other words, by changing the length of the end portion of the bearing interposed between the fixed member and the movable member, the length of the bearing in the portion where the movable member strokes changes, so that the stroke of the movable member changes. The stroke can be adjusted.

Therefore, since the stroke adjusting mechanism composed of the screw mechanism as in the prior art is not necessary, the structure of the apparatus is simplified.

Further, since the end portion of the bearing is interposed between the fixed member and the movable member, it is possible to prevent the end portion of the bearing from closely contacting with the fixed member during magnetic attraction. Since the end portion of the bearing thus plays the role of the shim for preventing the close contact, the shim and the bearing are integrated and the number of parts can be reduced. This makes it possible to facilitate manufacturing.

According to the manufacturing method, when the fixing member is inserted into the guide hole and fixed, the fixing member is pressed against the tip of the bearing, and then the fixing member is pushed in and the end portion of the bearing is caulked and bent. Since the portion is interposed between the fixed member and the movable member, the bending degree of the end portion of the bearing is changed by changing the pushing amount of the fixed member, and the portion between the fixed member and the movable member is changed. The length of the interposition can be changed,
The stroke of the movable member can be adjusted as described above.

By pushing the fixing member in this manner,
Since the end portion of the bearing on the fixed member side can be easily interposed between the fixed member and the movable member, manufacturing is easy.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments. In FIG. 1 showing a solenoid according to an embodiment of the present invention, reference numeral 1 denotes the entire solenoid, which is used for a solenoid valve 2 as shown in FIG. It is provided.

The solenoid 1 generally has a guide hole 4 inside.
A solenoid body 1A, a plunger 6 as a magnetic movable member that is reciprocally inserted into a guide hole 4 of the solenoid body 1A via a sleeve 5 as a bearing, and is coaxial with the plunger 6 so as to face it. Is provided between the center post 7 and the center post 7 as a fixing member made of a magnetic material that is inserted into and fixed to the guide hole 2, and the plunger 6 is separated from the center post 7 and 3 and a spring 8 as a pressing means for pressing the valve seat 15 toward the valve seat 15 side.

The solenoid body 1A includes a case 9 having both ends open, a coil 11 housed in the case 9, the coil 11 being wound around a bobbin 10 having a guide hole 4 penetrating in the axial direction, and one of the cases 9. Lower plate 12 for guiding the magnetic path buried in bobbin 10 on the open end side to case 9
And an upper plate 13 for guiding the magnetic path from the case 9 to the center post 7 provided at the other opening end of the case 9, and the upper plate 13 is provided at the other opening end of the case 9. The plate 13 is caulked and fixed.

The lower plate 12 is a cylindrical member having a flange portion 12A facing outward in the radial direction, and the cylindrical portion 12B.
The inner peripheral surface of the cylindrical portion 12B is exposed from the inner peripheral surface of the bobbin 10 forming the guide hole 4.
Will be done. On the other hand, the outer peripheral surface of the flange portion 12A is in contact with the inner peripheral surface of the case 9.

The upper plate 13 is annular, and its inner diameter is substantially the same as the diameter of the bobbin 10 forming the guide hole 4.

On the other hand, the plunger 6 has a substantially U-shaped cross section,
The closing portion 61 is integrally provided with a rod 14 which forms a valve body extending toward the valve seat 15 side of the valve body 3 on the central axis.

The plunger 6 having a substantially U-shaped cross section is
Guide hole 4 with its opening on the side of center post 7
It is reciprocally inserted through the sleeve 5 into the inner peripheral surface of the cylindrical portion 12B of the lower plate 12 forming the above. The bobbin 1 which is coaxial with the plunger 6 and which forms the guide hole 4 coaxially.
The center post 7 is inserted and fixed to the inner peripheral surface of the No. 0.

A spring 8 is provided between the center post 7 and the plunger 6. This spring 8
Has one end abutting on the end face of the center post 7 and the other end abutting on the closing part 61 in the recess of the plunger 6 to contact the plunger 6.
Is pressed in a direction away from the center post 7.

That is, the spring force of the spring 8 causes the tip of the rod 14 which is integrally operatively connected to the plunger 6 to be pressed against the valve seat 15.

On the other hand, the valve body 3 has an outward flange portion 3
1 has a substantially T-shaped cross section, and the flange portion 31 has a flange portion 12 of the lower plate 12 of the solenoid body 1A.
It is fixed to the solenoid body 1A by abutting against A or by being integrally formed with the bobbin 10 and caulking at the open end of the case 9.

The sleeve 5 has a predetermined length,
It is provided in contact with the end surface of the flange portion 31 of the valve body 3 and in contact with the inner peripheral surface of the cylindrical portion 12B of the lower plate 12. The end portion of the sleeve 5 on the side of the center post 7 is bent inward in the radial direction, and the end portion 51 of the sleeve 5 has the end portion 51.
And the plunger 6 are interposed.

The valve body 3 is provided with a valve seat 15 at which the tip of the rod 14 of the plunger 6 comes into contact with and separates from the valve seat 15, and an input port 16 for inputting a fluid pressure as a flow path opening to the valve seat 15.
And a drain port 32 that radially penetrates the valve body 3 for discharging the fluid pressure to the outside.

A through hole 91 communicating with the drain port 32 is provided at the open end of the case 9 to which the flange portion 31 of the valve body 3 is caulked and fixed.

Next, the operation of the solenoid valve 2 using the solenoid 1 will be described.

When the solenoid body 1A is not energized, the tip of the rod 14 operatively connected to the plunger 6 is brought into contact with the valve seat 15 by the spring force of the spring 8 to close the input port 16. This holds the control pressure.

When the solenoid body 1A is energized, the plunger 6 is magnetically attracted to the center post 7 against the spring force of the spring 8. As a result, the tip of the rod 14 is separated from the valve seat 15, the input port 17 and the drain port 32 communicate with each other, and the control fluid is drained through the through hole 91.

As described above, the solenoid 1 has the input port 16 opened in the valve seat 15 by making the plunger 6 stroke by energizing / de-energizing the solenoid body 1A.
Since the control pressure is controlled by opening and closing, the stroke accuracy of the plunger 6 is required.

Therefore, in the solenoid having the above structure, the end 51 of the sleeve 5 having a predetermined length, which is the bearing of the plunger 6, on the side of the center post 7 is interposed between the center post 7 and the plunger 6. Therefore, the movement of the plunger 6 is restricted at the end portion 51 when the plunger 6 is magnetically attracted.

Therefore, if the length of the end portion 51 of the sleeve 5 is made longer, the length of the portion where the plunger 6 strokes becomes shorter, and the stroke of the plunger 6 becomes shorter. On the contrary, if the length of the end portion 51 of the sleeve 5 is shortened, the length of the portion where the plunger 6 strokes becomes longer, and the stroke of the plunger 6 becomes longer.

In this way, the stroke of the plunger 6 can be adjusted by changing the length of the end portion 51 of the sleeve 5, so that the stroke of the stroke can be reduced by strictly controlling the accuracy of each component as in the prior art. There is no need to make adjustments or to provide a stroke adjustment mechanism using a screw mechanism. Therefore, the device structure can be simplified without impairing the manufacturability.

Further, since the end portion 51 of the sleeve 5 is interposed between the center post 7 and the plunger 6, the plunger 6 is moved to the center post 7 during magnetic attraction at the end portion 51.
Can be prevented from sticking to. Since the end portion 51 of the sleeve 5 thus plays the role of the shim for preventing the close contact, the shim and the sleeve 5 are integrated, and the number of parts can be reduced. This makes it possible to facilitate manufacturing.

Here, as a method of manufacturing a solenoid according to an embodiment of the present invention, a method of interposing the end portion 51 of the sleeve 5 between the center post 7 and the plunger 6 will be described with reference to the above description of the configuration. 2 will be described with reference to FIG.

As described above, the center post 7 is inserted and fixed to the inner circumference of the bobbin 10 forming the guide hole 4, and the sleeve 5 is provided on the lower plate 12 forming the guide hole 4 exposed from the inner peripheral surface of the bobbin 10. Since it is inserted into the inner peripheral surface of the cylindrical portion 12B, the outer diameter of the center post 7 is
It is larger than the outer diameter of the sleeve 5. The center post 7 has a convex portion 71 projecting toward the plunger 6 on the outer peripheral edge of the end face of the plunger 6 on the plunger 6 side.
Has an inner diameter substantially the same as the outer diameter of the sleeve 5, and its inner peripheral corner has an arc shape.

Then, the end portion 51 of the sleeve 5 is interposed between the center post 7 and the plunger 6 as follows.

First, the sleeve 5 having a predetermined length is inserted into the guide hole 4 until it comes into contact with the end surface of the flange portion 31 of the valve body 3. Of course, at this time, the end portion 51 is linear.

Next, the plunger 6 is inserted into the inner periphery of the sleeve 5, and the spring 8 is inserted into the recess of the plunger 6. After that, the center post 7 is inserted into the inner circumference of the bobbin 10 forming the guide hole 4 through the hole 13A of the upper plate 13 (see FIG. 2A).

Then, the center post 7 is inserted until it abuts on the tip of the sleeve 5. At this time, the tip of the sleeve 5 contacts the end surface on the inner peripheral side of the convex portion 71. After that, the center post 7 is further pushed in, so that the end portion 51 becomes the convex portion 71.
It is crimped along the arc portion and the end surface of the and bent inward in the radial direction (see FIG. 2B). As a result, the end portion 51 is interposed between the center post 7 and the plunger 6.

Therefore, by changing the pushing amount of the center post 7, the bending condition of the end portion 51 is changed, and the length of the interposing end portion 51 can be changed, and the stroke of the plunger 6 is adjusted as described above. can do.

By pushing the center post 7 in this manner, the end portion 51 of the sleeve 5 can be easily interposed between the center post 7 and the plunger 6, so that the manufacture is easy.

In the above embodiment, in order to easily bend the end portion 51 of the sleeve 5 as a bearing, the outer diameter of the center post 7 as a fixing member is made larger than the outer diameter of the sleeve 5, and the outer periphery of the center post 7 is made larger. Although the method of bending the end portion 51 of the sleeve 5 through the provided convex portion 71 has been described as an example, the outer diameter of the fixing member and the outer diameter of the bearing may be the same. When inserting and fixing, it suffices that the tip of the bearing hits.

[0048]

As described above, the present invention has the above-described structure and operation, and has the structure in which the end of the bearing having the predetermined length on the fixed member side is interposed between the fixed member and the movable member. The movement of the movable member is restricted at the end of the bearing. That is, by changing the length of the end portion of the bearing interposed between the fixed member and the movable member, the length of the portion where the movable member strokes can be changed, and the stroke of the movable member can be changed. That is, the stroke of the movable member can be adjusted.

Therefore, it is not necessary to provide a stroke adjusting mechanism composed of a screw mechanism as in the prior art, and the structure of the apparatus can be simplified.

Further, since the end portion of the bearing is interposed between the fixed member and the movable member, it is possible to prevent the movable member from being in close contact with the fixed member during magnetic attraction at the end portion. Since the end portion of the bearing thus plays the role of the shim for preventing the close contact, the shim and the bearing are integrated and the number of parts can be reduced. This makes it possible to facilitate manufacturing.

According to the manufacturing method, when the fixing member is inserted into the guide hole and fixed, the fixing member is pressed against the tip of the bearing, the fixing member is pushed in, and the end portion of the bearing is caulked and bent. Since the portion is interposed between the fixed member and the movable member, by changing the pushing amount of the fixed member, the bending condition of the end portion of the bearing is changed, and between the fixed member and the movable member. The length of the interposition can be changed,
The stroke of the movable member can be adjusted as described above.

By pushing the fixing member in this way,
Since the end of the bearing on the fixed member side can be easily interposed between the fixed member and the movable member, the manufacturing is easy.

[Brief description of drawings]

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

FIG. 2 shows a method for manufacturing a solenoid according to an embodiment of the present invention, and FIG. 2 (a) is an enlarged schematic sectional view of a portion A in FIG. 1 showing a center post before being pushed in. FIG. 1B is an enlarged schematic cross-sectional view of the portion A of FIG. 1 showing the center post after being pushed.

FIG. 3 is a sectional view of a solenoid valve using a conventional solenoid.

[Explanation of symbols]

 1 Solenoid 1A Solenoid main body 2 Solenoid valve 3 Valve main body 31 Flange portion 32 Drain port 4 Guide hole 5 Sleeve (bearing) 51 End portion 6 Plunger (movable member) 61 Closure portion 7 Center post (fixed member) 71 Convex portion 8 Spring 9 Case 91 Through hole 10 Bobbin 11 Coil 12 Lower plate 12A Flange portion 12B Cylindrical portion 13 Upper plate 13A hole 14 Rod 15 Valve seat 16 Input port

Claims (2)

[Claims] 1. A solenoid main body having a guide hole inside, a movable member made of a magnetic material reciprocally inserted into a guide hole of the solenoid main body through a bearing having a predetermined length, and the movable member. A solenoid provided with a fixed member made of a magnetic material, which is provided coaxially with the fixed member, and the end of the bearing on the fixed member side is interposed between the fixed member and the movable member. Solenoid characterized by. 2. A movable member made of a magnetic material is reciprocally inserted into a guide hole of a solenoid main body having a guide hole inside through a bearing having a predetermined length, and the magnetic member is opposed to the movable member. In a method for manufacturing a solenoid by inserting and fixing a body-made fixing member in the guide hole, when inserting and fixing the fixing member in the guide hole, after applying the fixing member to the tip of the bearing, the fixing member is pushed into the guide hole. A method for manufacturing a solenoid, characterized in that the end portion is interposed between the fixed member and the movable member by crimping and bending the end portion.