JPH0571660A - Solenoid valve and manufacture thereof - Google Patents

Abstract

(57) [Abstract] [Purpose] Automation of solenoid valve assembly, reduction of manufacturing cost,
The responsiveness of valve body operation is improved, and the movement stroke of the valve body drive plunger can be adjusted during the final assembly of main parts. [Structure] Both ends of a plunger with valve body 3 are supported by bearings 6 and 12 provided on an outer yoke 1 and an inner yoke 2. The bearing 6 is assembled from the outside of the solenoid valve together with the valve seat 7. The inner yoke 2 should be aligned with this mounting direction.
The base 12, the bearing 12, the tubular member 5, the electromagnetic coil 4, the outer yoke 1, the return spring 11 and the like are sequentially assembled. The bearing 6 and the valve seat 7 are assembled at the end of the main parts. The valve seat 7 is cold-plastically flowed through a part of the yoke 1 and is seal-connected. The yokes 1 and 2 are also cold-plastic flow-coupled, whereby compressive stress remains in the tubular member 5 and the member 5
The entire circumference of both ends is crimped to the yokes 1 and 2 to form a pressure resistant seal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid valve containing a plunger with a valve body.

[0002]

2. Description of the Related Art Conventionally, a plunger with a valve body, a return spring, a valve seat, an electromagnetic coil, etc. are internally provided in a yoke constituting an outer shell of an electromagnetic valve, and the excitation, demagnetization and return spring of the electromagnetic coil cooperate with each other. 2. Description of the Related Art An electromagnetic valve of a type in which a plunger with a valve element is reciprocally moved in an axial direction to open and close (separate contact) between a valve element and a valve seat is widely known.

For example, in a solenoid valve (normally closed type) disclosed in Japanese Patent Laid-Open No. 63-254283 (first prior art), a valve seat is integrally formed with one yoke which is an outer shell of the solenoid valve. At the same time, the plunger with the valve element is incorporated via a bearing so as to be movable in the axial direction.

In a solenoid valve (normally open type) disclosed in FIGS. 1 to 4 of Japanese Patent Laid-Open No. 63-235778 (second prior art), a valve is provided in a yoke forming an outer shell of the solenoid valve. The seat is formed integrally, and the plunger is supported so as to be movable in the axial direction by using a sleeve that forms a fluid filled portion (moving space of the plunger with a valve body) in the solenoid valve body. This conventional example uses a sleeve as a bearing.

A solenoid valve (normally closed type) shown in FIG. 1 of Japanese Patent Laid-Open No. 63-266284 (third prior art).
In the solenoid valve shown in FIG. 2 (normally open type), a valve seat separate from the yoke forming the outer shell of the solenoid valve is incorporated in the solenoid valve body, and the solenoid valve is the same as in the second prior art. A plunger with a valve element is supported in the main body by a sleeve so as to be movable in the axial direction.

The solenoid valve shown in FIG. 1 (normally open type) and the solenoid valve shown in FIG. 6 (normally closed type) of JP-A-64-46080 (fourth prior art) are separate from the yoke. Is incorporated in the solenoid valve body.

Further, a solenoid valve (normally closed type) disclosed in Japanese Patent Laid-Open No. 63-111280 (fifth prior art).
In the above, a nozzle with a valve seat and a bearing in the vicinity thereof (a bearing that also serves as a stopper for a plunger) are attached to the solenoid valve body from the outside.

[0008]

As described above, there are various solenoid valves.

Of these prior arts, when the valve seat is integrally formed with the yoke forming a part of the outer shell of the solenoid valve as in the first and second prior arts, the entire yoke is resistant to wear. Since it is necessary to manufacture it with a material having high hardness and high hardness, the processing and material costs are relatively high. Also, in the case of a normally open type solenoid valve, the yoke on the valve seat side serves as an electromagnetic attraction surface, so high magnetic properties are required for this, but with ordinary steel materials, the higher the hardness, the lower the magnetic properties tend to be. There is.

On the other hand, when the valve seat is formed separately from the yoke as in the third and fourth prior arts, the above problems do not occur. However, these valve seats are installed inside the solenoid valve body in a state where they cannot be externally attached, and since sealing properties are required, it is necessary to take special measures. It is necessary to partially assemble the yoke and the yoke (hereinafter referred to as a subassembly), which is a cause of hindering automatic assembly by a consistent assembly line.

When supporting a plunger with a valve element using a sleeve as in the second and third prior arts, the clearance between the outer circumference of the plunger and the inner circumference of the sleeve should be made as small as possible in order to support the plunger with high accuracy. On the other hand, on the other hand, the response action of the plunger to the input signal, that is, the time delay of opening / closing the solenoid valve becomes large due to the influence of the viscous resistance of the hydraulic oil. Conversely, if it is attempted to reduce the time delay of opening / closing the solenoid valve, The clearance between the circumferences becomes large, and the accuracy of supporting the plunger tends to decrease.

On the other hand, the above-mentioned problems do not occur in the plunger support structures of the first, fourth, and fifth prior arts, but the bearing on the valve seat side that supports the plunger is generally from the outside. Since it is an internal assembling method that is impossible to assemble, and it is in a deep place, it is necessary to preassemble the bearing and the yoke or the assembly of the bearing, the plunger and the nozzle to be mounted on another assembly line. This is also a cause of hindering automatic assembly by a consistent assembly line.

Further, conventionally, an O-ring is generally used to seal the fluid filling portion (plunger moving space) in the solenoid valve body, and therefore the number of parts is large, and the parts machining and assembly tend to be complicated. is there.

Further, in both cases, the stroke of the plunger is already determined at the stage where the yoke of the solenoid valve is coupled to form the shell of the solenoid valve, so that it is difficult to adjust the stroke later. there were.

The present invention has been made in view of the above points, and it is an object of the present invention to solve the above-mentioned problems and to make it possible to manufacture a solenoid valve by automating it on a consistent assembly line, thereby reducing the manufacturing cost. An object of the present invention is to provide a solenoid valve which is excellent in response operation and can easily adjust stroke adjustment of a plunger with a valve element during assembly.

[0016]

In order to achieve the above object, the present invention is basically constructed as follows. Hereinafter, in order to facilitate understanding of the contents, reference will be made to the reference numerals of FIG.

That is, according to the present invention, the outer yoke 1 and the inner yoke 2 are combined to form an outer shell of the solenoid valve body, and the plunger 3 with the valve body 3a is provided in the solenoid valve body via the bearings 6 and 12. The electromagnetic coil 4, which is installed so as to be movable in the axial direction, is arranged around the moving space S of the plunger 3 with a valve body and applies a driving force to the plunger 3 with a valve body, the moving space S of the plunger with a valve body and the electromagnetic field. In a solenoid valve including a tubular member 5 for sealing and partitioning the coil 4 from the storage portion, a valve seat 7 for the valve body 3a, and a return spring 11, the bearings 6 and 12 have a plunger with a valve body. One bearing 6 is disposed on the outer yoke 1 side and the other bearing 12 is disposed on the inner yoke 2 side so as to support both axial ends of 3, and the outer yoke 1 is fitted into the plunger movement space S. A hole 15 is provided, and the valve seat 7 is assembled in the fitting hole 15 together with the bearing 6 on the outer yoke 1 side from the outside of the outer shell of the solenoid valve. It is made by cold plastic flow to tightly seal the outer periphery of the valve seat 7, and among the above-mentioned constituent parts of the solenoid valve, the outer yoke 1, the inner yoke 2 and other parts (separate parts, such as bearings). 6, 12, valve seat 7, tubular member 5, plunger 3 with valve element, return spring 1
1, the electromagnetic coil 4 and the like) have a shape and a structure in which the outer yoke 1 and the separate component can be sequentially assembled from the same direction in a predetermined order with the inner yoke 2 as a base. The bearing 6 and the valve seat 7 are provided on the outer yoke 1 side (this is the first invention).

When assembling the solenoid valve having the above structure,
A peripheral groove 22 is formed in the outer periphery of the inner yoke 2 in the vicinity of a fitting inlet for the outer yoke 1 before assembly, and the tubular member 5 is made of a material having a hardness higher than that of each of the yokes 1 and 2. Under the conditions, in the step of sequentially assembling the outer yoke 1 and the separate component while using the inner yoke 2 as a base, the outer yoke 1 and the inner yoke 2 are joined together after the tubular member 5 is assembled, and In this connection, the outer yoke 1 is coined from the axial direction at the periphery of the fitting inlet (reference numeral 23 is a coining point), and the plastic flow generated by the coining is applied to the inner yoke 2
In the joining step, a part of the compressive stress caused by the pressing force of the coining remains in the tubular member 5 by the plastic flow coupling even after coining, and the residual compression is performed. Cylindrical member 5 due to stress
Also, a step of forming a pressure-resistant seal by crimping the entire peripheral edges of both ends to a part of each of the yokes 1 and 2 is performed, and the fitting provided on the outer yoke 1 side as the end of a series of assembly of the above-mentioned components. The yoke side bearing 6 is inserted and locked from the outside of the solenoid valve outer shell to the outward step 24 inside the hole 15 and the valve seat 7 is inserted and set. A method for assembling the valve seat 6 is proposed by coining from the direction (reference numeral 27 is this coining point) (this is the second invention).

As an application of these inventions, FIG.
As described above, the valve bodies 3a and 3a 'are provided at both ends of the plunger 3, and the inner yoke 2 side corresponding to the valve body 3a' is also fitted with the fitting hole 15, the bearing 6, and the valve seat 7 on the outer yoke 1 side. A structure in which the fitting hole 15 ', the bearing 6', and the valve seat 7 are arranged is proposed.

[0020]

The operation of the first aspect of the invention: Outer yoke 1, inner yoke 2 and separate components among the components constituting the solenoid valve have such a shape and structure that they can be assembled in the same direction in a predetermined order. Therefore, for example, with the inner yoke 2 as a base, the bearing 12 on the inner yoke 2 side, the tubular member 5,
The electromagnetic coil 4, the plunger with valve body 3, etc. can be assembled in sequence, and then the outer yoke 1
Cover. The order of assembling these components can be set arbitrarily, and the bearing 12 can be integrally formed with the core portion 2A of the inner yoke 2, for example.

By assembling the components as described above with the inner yoke 2 as a base, the components are not assembled in a recessed portion surrounded by a high wall like the outer yoke 1, and the comparison is made. Assembling of the above various separate items can be carried out in a space with sufficient space.

Finally, the bearing 6 and the valve seat 7 are assembled into the fitting hole 15 from the outer side of the outer yoke 1 at the end of the above-mentioned components, and the plasticity is provided by cold plastic flow at the periphery of the fitting hole. The fluidized portion tightly seals and joins a part of the outer circumference of the valve seat 7. That is, the binding connection portion between the valve seat 7 and the outer yoke 1 is in a compressive residual stress state, and high-strength seal connection is achieved.

The above-described series of assembling is done from the same direction with the inner yoke 2 as a base, and with a relatively large space around the assembling location, so that the solenoid valve can be automatically operated on a consistent production line. It is possible to assemble the same.

Since the bearing 6 and the valve seat 7 are mounted from the outside after the yokes 1 and 2 are coupled to each other, the moving stroke of the plunger 3 with a valve body is determined by the dimension of the valve seat 7 or the valve seat side bearing 6 even after the yokes are coupled to each other. It becomes adjustable by adjustment.

Since both ends of the plunger 3 are supported by the bearings 6 and 12, the fluid resistance during movement of the plunger is reduced and the responsiveness of the solenoid valve is improved as compared with the case where the cylindrical member supports the plunger.

Since the valve seat 7 is a separate piece from the yoke, it is easy to select the material for the yoke and ordinary steel materials can be used.

Operation of the second invention ... Also in the present invention, like the first invention, it is possible to automatically assemble electromagnetic valves in a consistent manufacturing line. Further, after the cylindrical member 5 for partitioning the fluid filled portion (plunger moving space) S and the electromagnetic coil 4 is assembled, cold plastic flow coupling is performed by coining the outer yoke 1 and the inner yoke 2, and the plastic flow Part of the compressive stress caused by the pressing force of the coining on the tubular member 5 due to the synergistic effect of the dents entering the circumferential groove 22 of the inner yoke 2 and the hardness of the tubular member 5 being sufficiently higher than the yokes 1 and 2. Remains. Due to this compressive stress, the entire peripheral edges of both ends of the tubular member 5 are pressure-bonded to part of the yokes 1 and 2 (core portion) to maintain high pressure-proof sealing property. As a result, there is the rationality that the pressure-resistant seal is formed by the tubular member 5 at the same time in the process of joining the yokes 1 and 2.

Further, at the end of the above-mentioned components, the bearing 6 and the valve seat 7 on the valve seat side are assembled from the outside into the fitting hole 15 of the outer yoke 1. In this case, the assembly of the valve seat 7 is also cooled by coining. Since the inter-plastic flow coupling is used, it exhibits a high pressure-resistant seal coupling. Since no O-ring is used to form these pressure-resistant seals, the number of parts is reduced and the assembly is simplified, which greatly contributes to the automation of the solenoid valve assembly.

[0029]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a vertical cross-sectional view of a solenoid valve according to a first embodiment of the present invention. As an example, for a normally open type hydraulic control applied to an ABS (anti-lock brake system) for controlling the braking force of an automobile. A solenoid valve is illustrated. 2 to 7 are explanatory views showing an assembly process of the solenoid valve of FIG.

As shown in FIG. 1, the solenoid valve has an outer shell composed of an outer yoke 1 and an inner yoke 2, which are connected to each other. Outer yoke 1
The inner yoke 2 and the inner yoke 2 are made of a magnetic material (for example, low carbon steel), and are materials capable of cold plastic coupling.

A cylindrical member 5 is arranged between the outer yoke 1 and the inner yoke 2 to partition the moving space (fluid filling portion) S of the plunger 3 and the electromagnetic coil 4 housing portion around the moving space S. .. The tubular member 5 is made of a material having a hardness higher than those of the outer yoke 1 and the inner yoke 2 and having a non-magnetic property or a low saturation magnetic flux density (for example, austenitic stainless steel), and one end of the tubular member 5 has a sharp edge in the axial direction. Is becoming One end of the tubular member 5 is the outer yoke 1
Of the core 1A provided in the center of the inner yoke 2 and the other end of the inner yoke 2 provided with the step 21 of the core 2A provided in the center thereof. It exerts a sealing function when it is plastically bonded.

That is, a groove 22 is formed on the peripheral edge of the inner yoke 2 near the fitting entrance of the outer yoke 1, and cold plastic working 23 by coining is applied near the fitting entrance of the outer yoke 1 to obtain its plasticity. When the flow enters the groove 22, the outer yoke 1 and the inner yoke 2 are seal-coupled. Due to this seal connection (cold plastic flow connection), a compressive stress remains in the tubular member 5, and due to this residual compressive stress, the entire circumference of both ends of the tubular member 5 is fixed to each yoke 1,
By crimping to the second step portions 20 and 21, a high pressure-resistant seal that overcomes the internal pressure of the fluid filling portion S is exhibited. Core 1
It is also possible to separate A and 2A from the respective yokes 1 and 2.

The plunger moving space S is surrounded by the yokes 1 and 2 and the tubular member 5 and is formed in the center of the solenoid valve body in the axial direction. A fluid passage 25 is formed in the outer yoke 1 in the radial direction. It is designed to meet. A fitting hole 15 is provided on the fluid outlet side of the outer yoke 1 which is one end of the plunger moving space S, and the valve seat 7 is arranged in the fitting hole 15.
A bearing 6 is arranged near the valve seat 7 and upstream of the valve seat 7, and a bearing 12 is arranged inside the inner yoke 2 side which is the other end of the plunger movement space S. The bearing 6 has a flow passage hole 6a arranged around the plunger supporting portion.

One end of the plunger 3 extends in the shape of a rod, the valve body 3a is integrally formed at the tip thereof, and the both ends are bearings 6 and 12.
It is mounted in the plunger movement space S so as to be able to reciprocate in the axial direction while being supported by. In addition, the return spring 11 causes the valve body 3
a is urged in a direction away from (opening) the valve seat 7. The valve body-equipped plunger 3 is also made of a magnetic material (for example, carbon steel for mechanical structure), and only the valve body portion 3a is induction hardened.

The valve seat 7 and the bearing 6 provided in the vicinity thereof are assembled in the following manner.

Plunger movement space S of the outer yoke 1
An outwardly facing step portion 24 is formed in one end side, that is, in the fitting hole 15 of the outer yoke 1. The valve seat 7 and the valve seat side bearing 6 have the same outer diameter, and a plurality of grooves 26 are circumferentially provided on the outer peripheral surface of the valve seat 7. The hardness of the valve seat 7 is higher than that of the outer yoke 1. The valve seat side bearing 6 is inserted and locked in the fitting hole 15 from the outside of the outer shell of the solenoid valve, and the valve seat 7 is further fitted.
Cold plastic flow around the fitting hole 15 of the outer yoke 1 near the groove 26 by coining (portion of reference numeral 27), and by allowing the plastic flow to enter the groove 26, the valve seat 7 is tightly sealed and coupled to the bearing. 6 is fixed. That is,
A boundary between the outer yoke 1 and the circumferential groove 26 of the valve seat 7 is cold plastic flow-coupled by partially retaining residual compressive stress due to pressurization of the coining, thereby forming a pressure resistant seal structure having high strength. The bearing 6 and the bearing (opposite valve seat side bearing) 12 on the opposite side are made of a non-magnetic material (for example, a copper alloy). Since the valve seat 8 is required to have wear resistance, it is made of a material having H _R C50 or more (for example, SUS440C hardened material).

The electromagnetic coil 4 is housed in a housing portion provided in the outer yoke 1 so as to surround the plunger moving space S. When the electromagnetic coil 4 is not energized, the return spring 11 causes the plunger 3 to move to the bearing 1 on the side of the inner yoke 2 opposite to the valve seat.
The valve body 3a is biased toward the second side, the valve body 3a is separated from the valve seat 7, and the solenoid valve is in an open state. As described above, the bearing 12 has the plunger 3
Also functions as a stopper.

When the electromagnetic coil 4 is energized, a magnetic circuit is formed by the outer yoke 1, the inner yoke 2 and the plunger 3, and the plunger 3 is attracted to the attraction surface 1a of the outer yoke 1 against the force of the return spring 11. The solenoid valve closes. In addition, 8 and 9 are O-rings provided on the outer circumference of the yoke, and 1
0 is a filter.

Next, the manufacturing process of the solenoid valve of this embodiment will be described with reference to FIGS.

First, as shown in FIG. 2, the inner yoke 2
With the base as the base, the bearing 12 on the side opposite the valve seat
The bearing 12 is inserted into the core portion 2A of FIG. Next, one end (one end opposite to the sharp one end) of the tubular member 5 is inserted while being locked to the step portion 28 provided on the core portion 2A of the inner yoke 2, and the inner yoke peripheral edge (core The end surface (portion 2A) is coined for plastic flow (portion indicated by reference numeral 29), and thus the inner yoke 2 and one end of the tubular member 5 are tightly sealed and bonded by cold plastic flow connection.

The plunger 3 is inserted into the inner periphery of the tubular member 5 of the assembly of the inner yoke 2 and the electromagnetic coil 4 is fitted onto the outer periphery of the tubular member 5 (FIG. 3). Then, as shown in FIG. 4, the outer yoke 1 is covered with the core portion 1A of the tubular member 5 fitted and locked, and the inner yoke 2 and the outer yoke 1 are subjected to cold plastic flow coupling by coining. However, since a part of the residual compressive stress on the tubular member 5 due to the pressing force of the coining is also held in the coining, the tubular member 5 is pressure-resistant to the yokes 1 and 2. It is assembled with a seal structure.

Then, as shown in FIG. 5, the valve seat side bearing 6 is inserted into the fitting hole 15 provided with the step portion 24 provided near the outlet side of the outer yoke 1 while the valve seat side bearing 6 is locked, and the valve seat 7 is sequentially installed. After assembling, as shown in FIG. 6, a punch 16 applies a pressing force in the axial direction to the peripheral edge of the outer yoke 1 near the valve seat 7 to perform coining 27, and the inner periphery of the fitting hole 15 near the coining is raised. , This is the outer peripheral groove 2 of the valve seat 7.
6 by plastic flow, the outer yoke 1 and the valve seat 7
To bond the bondage seal. That is, the valve seat side bearing 6 and the valve seat 7 are also assembled from the electromagnetic valve outer shell.

For reference, the outer diameters of the valve seat 7 and the valve seat side bearing 6 are φ5.8 mm, and the valve seat 7 is made of S45C hardened material. Using C5191B for the valve seat side bearing 6 and S6C for the outer yoke 1, an assembly was created by finishing each part only by normal cutting, and as a result of pressure resistance test, as a result, the joint part of the valve seat 7 and the outer yoke 1 was The internal pressure resistance reached 44.1 MPa or more.

After assembling the valve seat 7 and the bearing 6 on the valve seat side to the outer yoke 1 as described above, the O-rings 8 and 9 and the filter 10 are mounted on the outer periphery of the outer yoke 1 to normally open. Complete the assembly of the solenoid valve.

According to this embodiment, the following effects can be obtained.

(1) As described in the assembly process, in the manufacture of the solenoid valve of this embodiment, the inner yoke 2 is used as the base, and the non-valve seat side bearing 12, the tubular member 5, and the plunger with the valve body are provided on the inner yoke 2. 3, the electromagnetic coil 4, the outer yoke 1, the valve seat side bearing 6, the valve seat 7 are sequentially inserted from the same direction and assembled, the assembly using these parts is put on a consistent production line, and the continuous flow is achieved. The process can be automated.

(2) In addition, the shape and surface accuracy of the valve seat 7, the bearing 6 and the yoke for assembling them before assembly are not required to be polished and can be sufficiently realized by ordinary cutting.

(3) Plunger moving space (fluid filling section)
The cylindrical member 5 for sealing the S and the housing of the electromagnetic coil 4 tightly adheres to the yokes 1 and 2 by utilizing the residual compressive stress at the time of cold plastic flow coupling of the yokes 1 and 2 and has a high pressure resistance sealing property A solenoid valve can be provided. Moreover, since this pressure-resistant seal structure does not use parts such as O-rings, the assembly can be simplified and the number of parts can be reduced.

(4) Since the valve seat and the yoke are molded separately, the yoke itself can be made of a commonly used magnetic material without using a material of high hardness such as the valve seat.

(5) The magnetic attraction surface 1a for attracting the plunger 3 can be integrated with the yoke 1, which also contributes to the reduction of the number of parts.

(6) Since the small diameter portions at both ends of the plunger 3 are supported via bearings, the supporting accuracy of the plunger 3 and thus the reliability of valve opening / closing are improved while facilitating the support of the plunger 3, and the bearing-plunger Since the gap area can be made significantly smaller than that of the conventional method in which the plunger is supported by the seal tube, the influence of the viscosity of the fluid control object on the response can be reduced and the performance as a solenoid valve can be improved.

(7) The moving stroke of the plunger 3 can be easily adjusted by adjusting the dimensions of the valve seat 7 or the valve seat side bearing 7 assembled at the end of the assembly process.

FIG. 8 is a vertical sectional view of a solenoid valve according to the second embodiment of the present invention.

The solenoid valve according to FIG. 8 is a normally closed type solenoid valve, and in the figure, the same reference numerals as those in the first embodiment indicate the same or common elements (the same applies to the drawings after FIG. 8).

In the case of the present embodiment, parts constituting the solenoid valve,
The same consideration is given to the seal structure and the assembly process as in the first embodiment. The difference is that the return spring 11 urges the plunger with valve body 3 toward the valve seat 7, and the electromagnetic coil 4 is excited. Is provided on the inner yoke 2 side as indicated by reference numeral 2a.

The core portion 2 of the inner yoke 2 is replaced with the bearing 12 on the inner yoke 2 side as in the first embodiment.
A also serves as a bearing for the plunger 3. That is,
A rod 14 forming a part of the plunger 3 is attached to one end of the plunger 3, and the rod 14 is inserted into and supported by a guide hole provided in the core portion 2A via a spacer 13 made of a non-magnetic material.

Regarding the assembling order of the solenoid valve of this embodiment, the order of the return spring 11 is earlier than that of the first embodiment, but the rest is the same.

FIG. 9 is a vertical sectional view of a directional control valve according to a third embodiment of the present invention.

The difference of this embodiment from the first embodiment is that
Similarly to the fitting hole 15 provided on the outer yoke 1 side, a fitting hole 15 'with a step portion 24' is formed on the inner yoke 2 side, and the bearing 6'and the valve seat 7'are formed in the fitting hole 15 '. It is in the point that was assembled. The bearing 6'and the valve seat 7'are assembled in the same manner as the bearing 6 and the valve seat 7 on the outer yoke 1 side. That is, reference numerals 26 ′ and 27 ′ indicate the circumferential groove for plastic flow coupling of the valve seat 7 and the plastic flow portion by coining. Shaft-shaped valve bodies 3a and 3a 'are formed at both ends of the plunger 4.

With such a structure, the electromagnetic coil 4
Is demagnetized, the return spring 11 moves the plunger 3
The valve body 3a 'is urged to press (close) the valve seat 7'side through the valve so that the valve body 3a side is opened and the electromagnetic coil 4
Is excited, the plunger 4 moves against the force of the return spring 11 to move the valve body 3a 'away from the valve seat 7' (open valve),
The valve body 3a is pressed against (closes) the valve seat 7.

In such a structure, the number of objects to be assembled with the valve seat side bearing and the valve seat is increased to a total of two places, the outer yoke 1 and the inner yoke 2. However, as a method of assembling, first, the inner yoke 2 side is attached. The valve seat 7'is assembled from the outside together with the bearing 6'and seal-bonded (fitting hole 1 for fitting the valve seat 7 '
This is the same as the first embodiment except that the 5'periphery is subjected to cold plastic flow by coining and seal connection).

That is, with the inner yoke 2 having the bearing 6'and the valve seat 7'as a base, one end of the tubular member 5 is fitted and locked to the yoke 2, and the plunger 3 with the valve body is attached to the tubular member 5. The electromagnetic coil 4 is assembled while being inserted into the inner periphery, and the electromagnetic coil 4 is fitted into the outer periphery of the tubular member 5 and incorporated. Then, the tubular member 5
The outer yoke 1 is fitted into the inner yoke 2 while being locked to the other end of the inner yoke 2, and the outer yoke 1 and the inner yoke 2 are cold-plastically fluidized by coining, and also partly after the tubular member 5 is joined. A pressure resistant seal is formed by the remaining compressive stress, and after setting the return spring 11, the bearing 6 and the valve seat 7 on the outer yoke 1 side are assembled from the outside by coining.

This embodiment also has the same effects as the first embodiment.

[0065]

According to the first aspect of the invention, the solenoid valve can be automatically manufactured by a consistent assembly line, and the valve seat is separated from the yoke, so that the yoke and the like are made of a normal magnetic material. The manufacturing cost is low, and the bearings support both ends of the plunger, so the stability of the operation of the plunger with valve body is improved.
In addition, the bearing area is reduced to reduce the influence of fluid viscosity to improve the response of the solenoid valve.Furthermore, the stroke adjustment of the plunger with a valve element is done at the valve seat or valve seat side at the end of the main component assembly. There is an effect that it is possible by adjusting the dimension of the bearing.

According to the second invention, in addition to the above effects, a strong pressure-proof seal can be provided between the fluid filling portion inside the solenoid valve body and the electromagnetic coil housing portion without using the O-ring. Therefore, it is possible to provide a solenoid valve having excellent sealing performance while reducing the number of parts and rationalizing the assembly.

[Brief description of drawings]

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

FIG. 2 is an explanatory diagram showing a solenoid valve assembling process of the first embodiment.

FIG. 3 is an explanatory view showing a solenoid valve assembling process of the first embodiment.

FIG. 4 is an explanatory view showing a solenoid valve assembling process of the first embodiment.

FIG. 5 is an explanatory diagram showing a solenoid valve assembling process of the first embodiment.

FIG. 6 is an explanatory diagram showing a solenoid valve assembling process of the first embodiment.

FIG. 7 is an explanatory diagram showing a solenoid valve assembling process of the first embodiment.

FIG. 8 is a vertical sectional view of a solenoid valve according to a second embodiment of the present invention.

FIG. 9 is a vertical sectional view of a solenoid valve according to a third embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Outer yoke, 1A ... Core part, 2 ... Inner yoke, 2A ... Core part, 3 ... Plunger with a valve element, 4 ... Electromagnetic coil, 5 ... Cylindrical member, 6 ... Bearing, 7 ... Valve seat, 11 ... Return Spring, 12 ... Bearing, 15 ... Fitting hole, 16 ... Punch, 2
DESCRIPTION OF SYMBOLS 1 ... Locking step part, 22 ... Circumferential groove of outer circumference of inner yoke,
… Coining mark, 24… Locking step, 26… Valve seat outer peripheral groove, 27… Coining mark, S… Plunger movement space.

Claims (13)

[Claims] 1. An outer yoke and an inner yoke are combined to form an outer shell of a solenoid valve body, and a plunger with a valve body is axially movably incorporated into the solenoid valve body via a bearing. An electromagnetic coil which is arranged around the moving space of the plunger with body and applies a driving force to the plunger with valve body, and to seal and partition the moving space of the plunger with valve body and the storage part of the electromagnetic coil A cylindrical member, a valve seat for the valve element, and a return spring, wherein the bearing supports one end in the axial direction of the plunger with the valve element so that one bearing is on the outer yoke side.
The other bearing is arranged on the inner yoke side, and a fitting hole communicating with the plunger movement space is provided in the outer yoke, and the valve seat together with the bearing on the outer yoke side of the solenoid valve outer shell is provided in the fitting hole. The valve seat is assembled from the outside by cold plastic flow at the periphery of the fitting hole to tightly seal and bond the outer circumference of the valve seat by cold plastic flow. Among them, the outer yoke, the inner yoke, and parts separate from these (hereinafter referred to as separate parts) are based on the inner yoke as a base,
The outer yoke and the separate component have a shape and a structure that can be sequentially assembled in the same direction in a predetermined order, and the final part of this series of assembly is an assembly structure with a bearing and a valve seat on the outer yoke side. Solenoid valve characterized by that. 2. The separate component according to claim 1, comprising at least the bearing, a valve seat, a tubular member, a plunger with a valve element, a return spring, and an electromagnetic coil, and one of the bearings or the outer yoke, A solenoid valve, wherein any one of the inner yokes also serves as a stopper that regulates a movement amount of the plunger with a valve element. 3. The item according to claim 1 or 2, wherein the separate component is at least a bearing on the outer yoke side, a valve seat, a tubular member, a plunger with a valve element, a return spring, and an electromagnetic coil. A solenoid valve, wherein a bearing on the inner yoke side is formed integrally with the inner yoke. 4. An outer yoke and an inner yoke are combined to form an outer shell of a solenoid valve main body, and a plunger having a valve element at both ends is movably incorporated in the axial direction, and both the outer yoke and the inner yoke are mounted. The fitting holes communicating with both ends of the moving space of the plunger with a valve body are provided at positions, and the valve seat corresponding to each valve body supports each one end of the plunger with a valve body in these fitting holes. Assembling together with the bearing from the outside of the outer shell of the solenoid valve, the assembly of these valve seats is performed by cold plastic flow at the periphery of the fitting hole and tightly sealingly coupling the outer periphery of the valve seat by cold plastic flow. An electromagnetic coil that is arranged around the plunger moving space and applies a driving force to the plunger with a valve body, and a partition between the moving space of the plunger with a valve body and the storage part of the electromagnetic coil is sealed. A cylindrical member, a return spring, and the like, and the return spring and the electromagnetic coil cooperate with each other to excite and demagnetize the plunger to reciprocate the valve seat to open and close the valve body (valve opening and closing). The components of the solenoid valve are alternately switched, and the component parts of the solenoid valve are based on the inner yoke on which the valve shaft and the valve seat on the inner yoke side are assembled, and the cylindrical member, the plunger with a valve body, and The return spring, the electromagnetic coil, the outer yoke, the outer yoke side bearing and the valve seat have a shape and structure that can be sequentially assembled from the same direction, and the end of this series of assembly is the outer yoke side bearing and valve seat. Solenoid valve characterized by that. 5. The valve seat according to any one of claims 1 to 4, wherein a groove is provided on the outer circumference of the valve seat, and the fitting peripheral edge of the outer yoke is subjected to cold plastic flow in the groove. Solenoid valve characterized by binding with a tight binding seal. 6. A peripheral groove is provided in the outer periphery of the inner yoke in the vicinity of an outer yoke fitting inlet, and a peripheral edge of the outer yoke near the peripheral groove is in the axial direction. The yokes are cold plastically flow-coupled by the plastic flow generated by coining from the coining into the circumferential groove, while the tubular member uses a member having a hardness higher than that of each of the yokes. A part of the compressive stress caused by the pressing force of the coining is left in the tubular member due to the cold plastic flow coupling even after coining, and the residual compressive stress causes the entire peripheral edges of both ends of the tubular member to move to the respective yokes. A solenoid valve characterized by being pressure-bonded to a part to form a pressure-proof seal. 7. The outer yoke and the inner yoke according to any one of claims 1 to 6, wherein:
It has a core part in which the facing central part is projected inward,
An electromagnetic valve characterized in that the tubular member is interposed between the core portions while sealing. 8. The solenoid valve according to claim 7, wherein the core portion is formed integrally with or separately from the outer yoke and the inner yoke. 9. An outer shell of a solenoid valve body is formed by connecting an outer yoke and an inner yoke, and a plunger with a valve body is axially movably incorporated into the solenoid valve body via a bearing, and the valve is provided. An electromagnetic coil in which a valve seat for the body is disposed on the outer yoke side, and which is arranged around a moving space of the plunger with a valve body to give a driving force to the plunger with a valve body, and a movement of the plunger with a valve body A cylindrical member for sealing and partitioning between the space and the housing portion of the electromagnetic coil, a bearing for supporting the plunger with valve body, and a return spring for urging the plunger with valve body in a predetermined direction. In the solenoid valve, of the constituent parts of the solenoid valve, the outer yoke, the inner yoke, and parts separate from these (hereinafter referred to as separate parts) are based on the inner yoke. Then, the outer yoke and the separate product are preset in a shape and a structure that can be sequentially assembled from the same direction in a predetermined order, and the outer circumference of the inner yoke is provided with a circumferential groove near the fitting inlet for the outer yoke. Is formed in advance before assembly, the tubular member is made of a material having a hardness higher than that of each of the yokes, and under the above conditions, the outer yoke and the separate product are sequentially formed while the inner yoke is used as a base. Assembling, in this assembling step, the outer yoke and the inner yoke are coupled to each other after the cylindrical member is assembled,
Further, this coupling is performed by coining the peripheral edge of the outer yoke near the fitting inlet from the axial direction and causing the plastic flow generated by the coining to enter the circumferential groove of the inner yoke. A part of the compressive stress caused by the pressing force of the coining remains in the cylindrical member due to the cold plastic flow coupling even after coining, and the residual compressive stress causes the entire peripheral edges of both ends of the tubular member to move to one of the yokes. The step of forming a pressure-resistant seal by crimping to the portion is also performed, and as the last of a series of assembly of the above-mentioned components, the outer side of the outer shell of the solenoid valve is attached to the outward step inside the fitting hole provided on the outer yoke side. From the above, the bearing on the yoke side is inserted and locked, the valve seat is inserted and set, and the periphery of the fitting hole near the valve seat is coined from the axial direction to assemble the valve seat. And a method for manufacturing a solenoid valve. 10. The assembling of the tubular member according to claim 9, wherein the tubular member is inserted into the core portion of the inner yoke while locking one end of the tubular member. A method for manufacturing an electromagnetic valve, characterized in that one end of the tubular member is tightly sealed and joined by cold plastic flow of the core portion. 11. The electromagnetic valve assembling process according to claim 9 or 10, wherein a step of inserting a bearing into the core portion of the inner yoke by inserting the bearing into the core portion of the inner yoke by using the inner yoke as a base, A step of inserting and locking one end of the tubular member and cold plastically flowing a core portion near the insertion portion to tightly seal-join the one end of the tubular member; A step of inserting the outer yoke into the inner periphery while inserting it into the outer periphery of the tubular member, a step of fitting the electromagnetic coil to the outer periphery of the tubular member, and a core portion of the outer yoke of the assembly which has undergone the respective steps described above ( A step of performing a cold plastic flow connection by coining the outer yoke and the inner yoke after locking and covering at one end opposite to the one end where the binding connection seal connection has been performed) The step of inserting the return spring from the outer yoke side, and the step of inserting the bearing and the valve seat on the outer yoke side from the outside of the solenoid valve outer shell into the fitting hole provided on the outer yoke side after each step A method for manufacturing an electromagnetic valve, comprising the step of stopping and coining the periphery of the fitting hole near the valve seat from the axial direction to assemble the valve seat. 12. The assembling step of the valve seat according to any one of claims 9 to 11, wherein a groove is provided in advance on an outer periphery of the valve seat, and the groove is coined around a periphery of the fitting hole. A method for manufacturing an electromagnetic valve, which is characterized in that the plastic flow portion generated by the method is introduced. 13. An outer yoke and an inner yoke are combined to form an outer shell of a solenoid valve main body, and a plunger having a valve body at both ends is incorporated so as to be movable in the axial direction, and both the outer yoke and the inner yoke are provided. The fitting holes communicating with both ends of the moving space of the plunger with a valve body are provided at the positions of the positions corresponding to the valve shaft and each valve body that support each one end of the plunger with a valve body in these fitting holes. An electromagnetic coil having a valve seat arranged around the plunger with a valve element to apply a driving force to the plunger with a valve element, a moving space of the plunger with a valve element and a storage portion of the electromagnetic coil. A solenoid valve for direction switching, comprising a tubular member for sealing and partitioning the space, and a return spring, in the vicinity of a fitting inlet for the outer yoke on the outer periphery of the inner yoke. Grooves are formed in advance before assembly, and the tubular member is made of a material having a hardness higher than that of each yoke. Under the above conditions, the inner yoke is used as a base for assembly, and the inner yoke side fitting hole In which the bearing and the valve seat are sequentially inserted and locked from the outside of the outer shell of the solenoid valve, and the periphery of the fitting hole near the valve seat is coined in the axial direction to assemble the valve seat by the plastic flow. A step of fitting and locking one end of the tubular member to an inner yoke; a step of inserting the plunger with a valve element into the inner periphery of the tubular member while inserting the electromagnetic coil on the outer periphery of the tubular member; The step of fitting and assembling, and the outer yoke is fitted to the inner yoke while being locked to the other end of the tubular member, and the peripheral edge near the fitting inlet of the outer yoke is coined from the axial direction to perform the coining. By Cold plastic flow coupling between the yokes by causing the same plastic flow to enter the circumferential groove of the inner yoke, and also after the coining part of the compressive stress resulting from the pressing force of the coining to the tubular member. A step of leaving a residual pressure by plastic flow coupling, pressing all the peripheral edges of both ends of the tubular member to a part of each of the yokes by this residual compressive stress to form a pressure-resistant seal, a step of setting a return spring, and Assembling the bearing and the valve seat on the inner yoke side in the fitting holes on the outer yoke side after the steps, and by assembling the bearing and the valve seat from the outside of the outer shell of the solenoid valve by the same process. A method for manufacturing a solenoid valve, which is characterized by the above.