JP2003232459A - Valve gear - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a valve gear comprising a valve element of an opening and closing valve spring-energized in a valve opening direction that is driven in a valve closing direction by a solenoid capable of reducing the number of parts and assemblage mandays, and achieving low cost. <P>SOLUTION: A valve housing 7 comprises a housing main part 8 of a cylindrical form having a bottom, and an upstream side connection pipe 9 and a downstream side connection pipe 10 extended sideways from side surfaces of the housing main part 8 which are integrally die-molded. Opening ends of the housing main part 8 and a solenoid housing 37 are caulked and coupled with each other. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve device, and more particularly to improvement of a valve device in which a valve body of an opening / closing valve which is spring-biased in a valve opening direction is driven by a solenoid in a valve closing direction.

[0002]

2. Description of the Related Art Conventionally, such a valve device is disclosed in, for example, Japanese Patent Laid-Open No.
It is disclosed in Japanese Patent Publication No. 001-248433, in which the valve device is used to control the flow rate of the secondary air supplied to the exhaust system of the engine.

[0003]

However, in the valve device disclosed in the above publication, the valve housing of the on-off valve has the valve case to which the downstream side connecting pipe is attached and the cover to which the upstream side connecting pipe is attached. However, the number of parts and the number of assembly steps are relatively large, and it is difficult to reduce the cost.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a valve device capable of reducing the number of parts and the number of assembling steps and reducing the cost.

[0005]

In order to achieve the above object, the invention according to claim 1 communicates with a valve housing in which an upstream side connecting pipe and a downstream side connecting pipe are connected, and the upstream side connecting pipe. Valve seat formed in the valve housing so as to face the valve chamber formed in the valve housing and open in the central portion of the valve hole communicating with the downstream side connecting pipe, and the valve seat seated on the valve seat And a valve body that is housed in the valve chamber and that is spring-biased toward the side that opens the valve hole, and that penetrates the valve hole so as to be movable in the axial direction and is connected to the valve body. An on-off valve having a valve shaft formed therein; a movable core coaxially connected to the valve shaft, a fixed core coaxially opposed to the movable core, and a coil on a bobbin surrounding the movable core and the fixed core. A coil assembly formed by winding and a bottomed body covering the coil assembly The coil assembly is sandwiched between a solenoid housing made of a magnetic metal, which is formed in a tubular shape and is magnetically coupled to the fixed core and is coupled to the valve housing, and a closed end of the solenoid housing. A solenoid having an end plate made of magnetic metal that is magnetically coupled to the solenoid housing; and the valve housing has a bottomed cylindrical housing main part, and a housing main part of the housing main part. It is characterized by being integrally molded with the upstream side connecting pipe and the downstream side connecting pipe extending laterally from the side surface, and the housing main part and the open end of the solenoid housing are caulked and coupled. .

According to the structure of the invention described in claim 1, the valve housing is integrally molded with the housing main portion, the upstream side connecting pipe and the downstream side connecting pipe. By constructing the valve housing with one member, the number of parts can be reduced, and the labor for assembling the valve housing can be saved to reduce the number of assembling steps, thus contributing to cost reduction. Further, since the valve housing and the solenoid housing are caulked and coupled, the circumferential relative position of the valve housing with respect to the solenoid housing can be freely selected, and the degree of freedom in setting positions of the upstream side connecting pipe and the downstream side connecting pipe can be improved. it can. Moreover, when the upstream side connecting pipe and the downstream side connecting pipe are attached to separate members, an attaching allowance is required, so that the axial length of the valve housing becomes relatively large, and a countermeasure against leakage at the attaching portion is required. However, since the upstream side connecting pipe and the downstream side connecting pipe are integrally connected to the main part of the housing, the valve housing can be downsized in the axial direction without the need for a mounting allowance, and the leak countermeasure is not necessary. .

The invention according to claim 2 is the above-mentioned claim 1.
In addition to the configuration of the invention described above, an annular step portion facing the side opposite to the solenoid is provided on the outer periphery of the opening end portion of the valve housing, and the opening end portion of the solenoid housing increases in size toward the valve housing side. A curved portion that is convexly curved inward so as to have a diameter, and an opening end portion of the housing main portion and an outer peripheral portion of the end plate are fitted so as to be connected to the large diameter end of the curved portion. A housing is provided such that a fitting tubular portion is provided, and an end portion of the fitting tubular portion on the side opposite to the curved portion sandwiches the open end portion and the end plate of the housing main portion between the end portion and the large diameter end of the curved portion. It is characterized by being caulkedly engaged with the stepped portion of the main portion.

According to the structure of the present invention as described above, a stepped portion for engaging the end plate and the housing main portion is easily formed in the solenoid housing without requiring a complicated processing such as cutting. Like this
Cost reduction can be achieved.

According to a third aspect of the present invention, in addition to the configuration of the first or second aspect of the invention, the main housing portion is provided between the upstream connecting pipe and the downstream connecting pipe connected to the main housing portion. A disk-shaped first partition wall fitted with a ring-shaped first seal member that fits elastically into the inner surface of the housing main part and is fitted to the housing main part of the downstream side connecting pipe. A disk-shaped member is fitted to the housing main portion at a position where the continuous portion is sandwiched between the first partition wall and an annular second seal member that is elastically contacted with the inner surface of the housing main portion is mounted on the outer periphery. A valve seat forming portion, which is connected to a second partition wall at a plurality of circumferential positions, is inserted into and fixed to the housing main portion, and forms the valve chamber between the valve seat forming portion and the closed end of the housing main portion. The valve hole that penetrates the center of the wall and the valve hole Wherein the annular valve seat surrounding an open end of the valve chamber side is provided.

According to the structure of the third aspect of the present invention, the valve seat forming portion, which is a small assembly of the first and second seal members previously attached, is inserted and fixed in the valve housing. The valve chamber connected to the side connecting pipe and the air chamber connected to the downstream connecting pipe can be formed inside the valve housing while maintaining the mutual sealing property between both chambers and the sealing property with the outside of the air chamber. The property can be made good.

According to a fourth aspect of the invention, in addition to the structure of the third aspect of the invention, the housing main portion has a first hole portion into which the first partition wall is fitted, and a first hole portion rather than the first hole portion. A second hole having a large diameter and into which the second partition wall is fitted is formed, and the diameter is gradually increased toward the opening end side. If
When the valve seat forming part is inserted into the valve housing, the range in which the first seal member contacts and slides on the inner surface of the valve housing is made as small as possible, and the force necessary for inserting the valve seat forming part into the valve housing is made small. It is possible to improve the assemblability and prevent damage to the first seal member as much as possible.

According to a fifth aspect of the present invention, in addition to the configuration of the first aspect of the invention, a coil sealing portion made of synthetic resin that covers the coil and is mold-bonded to the coil assembly is fitted in the solenoid housing. According to such a configuration, it is possible to prevent disconnection or short circuit due to vibration of the lead wire connected to the coil as much as possible.

According to a sixth aspect of the present invention, in addition to the structure of the third or fourth aspect of the present invention, the coil assembly is molded and coupled to the coil assembly so as to cover the coil, and is fitted into the solenoid housing. A coil sealing portion having an annular third seal member elastically contacting the inner circumference of the solenoid housing is mounted on the outer circumference, and a valve seat forming portion having the first and second seal members mounted on the outer circumference. It is characterized in that the end plate is embedded in an integrally formed mold sealing body made of a synthetic resin with the outer peripheral portion of the end plate exposed.

According to the structure of the invention described in claim 6, it is possible to enhance the assembling property by assembling the mold sealing body to which the coil assembly and the end plate are coupled to the valve housing. At the same time, it is possible to ensure the sealing between the inside and the outside of the mold sealing body.

According to a seventh aspect of the present invention, in addition to the structure of the fifth or sixth aspect of the present invention, the coil sealing portion is integrally provided with a coupler facing a terminal connected to the coil. The solenoid housing is provided with an opening for projecting the coupler outward. According to such a configuration, the coupler can be positioned and arranged at a predetermined position of the solenoid housing, and the coil in the solenoid housing can be positioned. It is possible to prevent circumferential displacement of the sealing portion.

According to an eighth aspect of the invention, in addition to the structure of the sixth aspect of the invention, the solenoid housing is
An annular gap is formed between a small diameter hole portion on the closed end side having an inner diameter for elastically contacting the third seal member and a diameter larger than the small diameter hole portion and the outer circumference of the coil sealing portion. It is characterized in that it has a large-diameter hole portion and is formed such that the diameter gradually increases toward the opening end side. According to such a configuration, the solenoid housing is provided in the coil sealing portion of the mold sealing body. The third seal member makes contact with and slides on the inner surface of the solenoid housing as much as possible, and the force required when the solenoid housing is covered by the coil sealing portion is reduced to improve the assemblability. Third
It is possible to avoid damage to the seal member as much as possible.

According to a ninth aspect of the present invention, in addition to the configuration of the sixth aspect, the end plate is
A disk portion that abuts the end surface of the bobbin on the opening / closing valve side, a cylindrical portion that surrounds a part of the bobbin by connecting one end to the outer periphery of the disk portion, and radially outward from the other end of the cylindrical portion. The second seal member is attached to the outer periphery of the valve seat forming portion at a position where at least a part thereof overlaps with the disc portion in a side view, and is integrally provided with a collar portion that projects from the mold sealing body while protruding. It is characterized by being done.

According to the structure of the invention described in claim 9, the distance between the second seal member and the end plate can be set to be small in cooperation with each other, and the axial length of the valve device can be shortened as much as possible.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below based on an embodiment of the present invention shown in the accompanying drawings.

In FIG. 1, this valve device is for controlling the flow rate of secondary air supplied to, for example, the exhaust system of an engine, and includes an opening / closing valve 5 and a solenoid 6 for driving the opening / closing valve 5 to open / close. Composed of and.

The on-off valve 5 includes a valve housing 7 integrally provided with an upstream side connecting pipe 9 and a downstream side connecting pipe 10, and a valve chamber 11 formed in the valve housing 7 by communicating with the upstream side connecting pipe 9.
The valve seat 12 that is fixedly arranged in the valve housing 7 by opening the valve hole 12 that opens to the downstream side connecting pipe 10 in the central part and closes the valve hole 12 by sitting on the valve seat 13. A valve body 14 that is housed in the valve chamber 11 as much as possible and is spring-biased toward the side that opens the valve hole 12;
The valve shaft 15 is connected to the valve body 14 so as to pass through the shaft 2 so as to be movable in the axial direction.

The valve housing 7 has a bottomed cylindrical housing main portion 8 and the upstream side connecting pipe 9 and the downstream side connecting pipe 10 which extend laterally from the side surface of the housing main portion 8 and are integrally formed. The upstream side connecting pipe 9 is integrally connected to a side surface of the housing main portion 8 near the closed end, and the downstream side connecting pipe 10 is integrally connected to an axially intermediate side surface of the housing main portion 8. It

A valve seat forming portion 17 made of a synthetic resin is inserted and fixed in the housing main portion 8. The valve seat forming portion 17 is connected to the upstream side connecting pipe 9 and the downstream side connecting pipe 1.
0 between the housing main part 8 and the housing main part 8
And a disk-shaped first partition wall 17a to which an annular first seal member 19 that is elastically contacted with the inner surface of the housing main part 8 is attached, and the downstream side connecting pipe 10
Of the annular main body 8 which is fitted to the housing main portion 8 at a position sandwiching the continuous portion of the housing main portion 8 with the first partition wall 17a and elastically contacts the inner surface of the housing main portion 8 on the outer periphery. The disk-shaped second partition wall 17b on which the 2 seal member 20 is mounted is connected through a plurality of connecting walls 17c arranged at a plurality of circumferential positions so as to allow the fluid to flow between them. It consists of

The first partition wall 17a is a housing main portion 8
The valve chamber 11 is formed between the closed end of the valve hole 11 and the valve hole 12 that penetrates through the central portion of the first partition wall 17a.
And an annular valve seat 13 surrounding the open end of the valve hole 12 on the valve chamber 11 side.

A fluid chamber 21 which is in constant communication with the valve hole 12 is formed between the first and second partition walls 17a and 17b, and the fluid chamber 21 is connected to the downstream side connecting pipe 10.

On the other hand, the housing main portion 8 is formed with a first hole 8a into which the first partition wall 17a is fitted and a second partition wall 17b into which the second partition wall 17b is fitted and which has a diameter larger than that of the first hole 8a. It has two holes 8b and is formed so that the diameter gradually increases toward the opening end side. Moreover, the first taper portion 8c is formed between the first and second hole portions 8a and 8b, and the second taper portion 8d is formed at the opening end of the second hole portion 8b. , 8d facilitates the insertion operation of the valve seat forming portion 17 into the housing main portion 8.

A cylindrical guide cylinder 23 extending toward the first partition wall 17a is integrally provided at the center of the second partition wall 17b, and the guide cylinder 23 moves the valve shaft 15 in its axial direction. Surround yourself as you can.

The valve body 14 is formed of a synthetic resin in a disk shape, and a ring member 24 made of a rigid material is embedded in the valve body 14. On the other hand, the tip of the valve shaft 15 has a valve hole 1
2 penetrates coaxially and rushes into the valve chamber 11,
In the valve chamber 11, the tip portion of the valve shaft 15 penetrates the central portion of the valve body 14. Moreover, a pair of metal seal receiving members 25, 26 are provided on the valve shaft 15 on both sides of the valve body 14 so that the engaging claw portions 25a, 26a provided on the inner periphery of the metal seal receiving members 25, 26 bite into the outer periphery of the valve shaft 15. Fixed, and both seal receiving members 25,
Annular seal members 27 and 28 are interposed between the valve 26 and the valve body 14, respectively.

A coil-shaped return spring 29 surrounding the valve shaft 15 and the guide cylinder 23 is contracted between the one seal receiving member 25 and the second partition wall 17b. The body 14 and the valve shaft 15 are urged toward the side where the valve body 14 separates from the valve seat 13 and opens the valve hole 12.

The solenoid 6 is a valve shaft 15 of the on-off valve 5.
A coil assembly in which a coil 35 is wound around a movable core 32 that is coaxially connected to the movable core 32, a fixed core 33 that coaxially faces the movable core 32, and a bobbin 34 that surrounds the movable core 32 and the fixed core 33. Solid 36 and the coil assembly 36
Between a solenoid metal housing 37 made of a magnetic metal, which is formed in a cylindrical shape having a bottom and covers the valve core 7 and is magnetically coupled to the fixed core 33, and a closed end of the solenoid housing 37. To the coil assembly 3
And an end plate 38 made of magnetic metal that is magnetically coupled to the solenoid housing 37 with 6 interposed therebetween.

A guide collar 39 made of a non-magnetic material and formed in a cylindrical shape by slidably fitting the movable core 32 is inserted into and fixed to the bobbin 34 so that the fixed core 33 also corresponds to the movable core 32. Then, it is inserted into the guide collar 39. Moreover, the fixed core 33 is caulked to the central portion of the closed end of the solenoid housing 37 having a bottomed cylindrical shape.

Further, the coil sealing portion 18 made of synthetic resin for covering the coil 35 is mold-bonded to the coil assembly 36, and the annular third seal member 40 elastically contacting the inner circumference of the solenoid housing 37 is provided. The coil sealing portion 18 mounted on the outer periphery is fitted into the solenoid housing 37.

Moreover, the coil sealing portion 18 and the on-off valve 5 are
The valve seat forming portion 17 is integrally formed as the mold sealing body 16, and the end plate 38 is embedded in the mold sealing body 16 with the outer peripheral portion of the end plate 38 exposed.

The mold sealing body 16 is provided with a regulation surface 41 which can come into contact with the movable core 32 in order to regulate the moving end of the movable core 32 on the side away from the fixed core 33.

The solenoid housing 37 is formed with a small-diameter hole portion 37a on the closed end side having an inner diameter for elastically contacting the third seal member 40, and a diameter larger than the small-diameter hole portion 37a, and the coil is sealed. It has a large-diameter hole portion 37b that forms an annular gap 42 with the outer circumference of the portion 18 and has a diameter that increases stepwise toward the opening end side, so that the on-off valve 5 side is open. It is formed in a cylindrical shape,
At the opening end of the solenoid housing 37, a curved portion 37c that is curved inward so as to have a larger diameter toward the valve housing 7 side, and the housing main portion 8
And a fitting cylindrical portion 37d connected to the large-diameter end of the curved portion 37c so as to fit the opening end portion and the outer peripheral portion of the end plate 38.

On the other hand, an annular step portion 43 facing the side opposite to the solenoid 6 is provided on the outer periphery of the opening end of the valve housing 7, and the end of the fitting cylindrical portion 37d on the side opposite to the curved portion 37c is provided. , The solenoid housing 37 and the end portion 38 of the housing main portion 8 are sandwiched between the large diameter end of the curved portion 37c and the stepped portion 43 of the housing main portion 8 by caulking. The valve housings 7 are connected to each other.

The coil sealing portion 18 is integrally provided with a coupler 45 facing terminals 44 connected to the coil 35.
An opening 46 for projecting the coupler 45 outward is provided on the opening end side of the solenoid housing 37.

The end plate 38 has a disk portion 38a which comes into contact with the end surface of the bobbin 34 on the opening / closing valve 5 side, and the disk portion 3
A cylindrical portion 38b that surrounds a part of the bobbin 34 by connecting one end to the outer periphery of 8a, and a cylindrical portion 38b that projects radially outward from the other end of the cylindrical portion 38b and has an outer peripheral portion from the mold sealing body 16. The projecting collar portion 38c is integrally provided, and the second
The seal member 20 is attached to the outer periphery of the valve seat forming portion 17 at a position where at least a part thereof overlaps with the disk portion 38a in a side view.

Next, the operation of this embodiment will be described. The valve housing 7 of the on-off valve 5 has a housing main portion 8,
Since the upstream side connecting pipe 9 and the downstream side connecting pipe 10 are integrally molded, the valve housing 7 is
It is possible to reduce the number of parts by using the members, reduce the labor for assembling the valve housing 7, reduce the number of assembling steps, and contribute to the cost reduction. Moreover, when the upstream side connecting pipe 9 and the downstream side connecting pipe 10 are attached to separate members, a mounting allowance is required, so that the axial length of the valve housing 7 becomes relatively large, and measures against leakage at the attaching portion are taken. Although it is necessary, since the upstream side connecting pipe 9 and the downstream side connecting pipe 10 are integrally connected to the housing main portion 8, the valve housing 7 can be downsized in the axial direction without the need for a mounting margin. At the same time, there is no need to take measures against leaks.

Further, a valve chamber 11 is formed between the valve housing 7 and the valve housing 7 and is fitted into the valve housing 7, and an annular valve seat surrounding the valve hole 12 and the opening end of the valve hole 12 on the valve chamber 11 side. A first partition wall 17a provided with 13 and a second partition wall 17b fitted into the valve housing 7 by integrally forming a fluid chamber 21 that is in constant communication with the valve hole 12 between the first partition wall 17a The valve seat forming portion 17 has a coil sealing portion 18, which is molded and coupled to the coil assembly 36 so as to cover the coil 35 on the solenoid 6 side and airtightly fitted to the solenoid housing 37. End plate 3 on the synthetic resin mold sealing body 16
8 is embedded so that the outer peripheral portion of the end plate 38 is exposed.

Therefore, it is possible to integrally assemble the coil assembly 36, the end plate 38, and the valve seat 13 while reducing the number of parts by eliminating the need to separately provide a member for forming the valve seat 13. The number of steps can be reduced, the cost can be reduced, and the sealing between the inside and the outside of the mold sealing body 16 can be ensured.
In addition, the coil sealing portion 18 that covers the coil 35 and is mold-bonded to the coil assembly 36 includes a solenoid housing 37.
It is possible to prevent disconnection or short circuit due to vibration of the conductive wire connected to the coil 35 as much as possible.

Moreover, since the valve housing 7 and the solenoid housing 37 are caulked and coupled, the circumferential relative position of the valve housing 7 with respect to the solenoid housing 37 can be freely selected, and the upstream connecting pipe 9 and the downstream connecting pipe 10 can be set. The degree of freedom of position can be improved.

Further, an annular step portion 43 facing the side opposite to the solenoid 6 is provided on the outer periphery of the opening end portion of the valve housing 7,
At the open end of the solenoid housing 37, a curved portion 37c that is curved inward so as to have a larger diameter toward the valve housing 7 side, an open end of the housing main portion 8 and the end plate. A fitting tubular portion 37d that is connected to the large diameter end of the curved portion 37c is provided so as to fit the outer peripheral portion of the curved portion 37c, and the end portion of the fitting tubular portion 37d on the opposite side of the curved portion 37c is The open end portion of the housing main portion 8 and the end plate 38 are sandwiched between the curved portion 37c and the large-diameter end, and the step portion 43 of the housing main portion 8 is caulked and engaged.

Therefore, it is possible to easily form a stepped portion in the solenoid housing 37 for engaging the end plate 38 and the housing main portion 8 without the need to perform a troublesome processing such as cutting on the solenoid housing 37. Cost reduction can be achieved.

On the outer periphery of the first partition wall 17a provided in the valve seat forming portion 17, an annular first seal member 19 elastically contacting the inner surface of the housing main portion 8 is mounted, and the outer periphery of the second partition wall 17b. A ring-shaped second seal member 20 that elastically contacts the inner surface of the housing main part 8 is attached to the first
Also, by inserting and fixing the valve seat forming portion 17 in which the second seal members 19 and 20 are preliminarily mounted and is assembled in the valve housing 7, the valve chamber 11 connected to the upstream connecting pipe 9 and the downstream connecting pipe. The fluid chamber 21 connected to 10 can be formed in the valve housing 7 while maintaining the mutual sealing property and the sealing property with the outside of the fluid chamber 21, and the assembling property can be improved. Further, the coil sealing portion 18 is fitted into the solenoid housing 37 via an annular third seal member 40 mounted on the outer periphery thereof, and the coil sealing portion 18 is molded and sealed while shortening the axial length of the solenoid 6 as much as possible. The inside of the stopper 16 can be sealed from the outside.

Moreover, the housing main portion 8 is formed with a first hole portion 8a into which the first partition wall 17a is fitted and a second hole portion with a diameter larger than that of the first hole portion 8a, into which the second partition wall 17b is fitted. The valve seat forming portion 1 has a hole portion 8b and is formed such that the diameter gradually increases toward the opening end side.
7 is inserted into the valve housing 7, the first seal member 19
Reduces the contact sliding range with the inner surface of the valve housing 7 as much as possible, and reduces the force required for inserting the valve seat forming portion 17 into the valve housing 7 to improve the assemblability and to the first seal member 19. It is possible to avoid damage as much as possible.

The valve seat forming portion 17 is formed by connecting a plurality of circumferential positions of the first and second partition walls 17a and 17b through a connecting wall 17c which allows fluid to flow between them. The strength of the first and second partition walls 17a and 17b can be maintained while avoiding an increase in the flow resistance of the fluid.

The second partition wall 17b of the valve seat forming portion 17
Is integrally provided with a cylindrical guide cylinder 23 that coaxially surrounds the valve shaft 15 so as to allow the valve shaft 15 to move in the axial direction. The second partition wall 1 surrounding the cylinder 23 and the valve shaft 15
Since it is contracted between 7b and the valve body 14, the return spring 29
It is possible to eliminate the need for a dedicated member for guiding the.

By the way, the coil sealing portion 18 of the mold sealing body 16 is integrally provided with the coupler 45 facing the terminal 44 connected to the coil 35, and the opening portion 46 for projecting the coupler 45 outward is provided. Since the coupler 45 is provided on the opening end side of the solenoid housing 37, the coupler 45 can be positioned and arranged at a predetermined position of the solenoid housing 37, and the circumferential displacement of the coil sealing portion 18 in the solenoid housing 37 can be prevented. be able to.

Further, the solenoid housing 37 is formed with a small diameter hole portion 37a on the closed end side having an inner diameter for elastically contacting the third seal member 40, and a diameter larger than the small diameter hole portion 37a, and the coil sealing. The coil sealing portion 18 has a large-diameter hole portion 37b that forms an annular gap 42 with the outer circumference of the stopper portion 18 and has a diameter that gradually increases toward the opening end side. Solenoid housing 37
When the cover is covered, the range in which the third seal member 40 makes contact with and slides on the inner surface of the solenoid housing 37 is made as small as possible, and the force required to cover the coil housing 18 with the solenoid housing 37 is made small to be assembled. It is possible to prevent damage to the third seal member 40 as much as possible.

Further, the end plate 38 has a disk portion 38a that abuts against the end surface of the bobbin 34 on the opening / closing valve 5 side, and a cylindrical portion that surrounds a part of the bobbin 34 by connecting one end to the outer periphery of the disk portion 38a. 38b and a flange portion 38c protruding outward from the other end of the cylindrical portion 38b in the radial direction and having an outer peripheral portion projecting from the mold sealing body 16 are integrally provided, and the second seal member 20 has a second seal member 20 in a side view. The disk portion 38
The valve seat forming portion 17 is attached to the outer periphery of the valve seat forming portion 17 at a position where at least a portion thereof overlaps with a.

Therefore, the distance between the second seal member 20 and the end plate 38 can be set to be small in cooperation with each other to shorten the axial length of the valve device as much as possible.

Further, a guide collar 39 made of a non-magnetic material, which is formed in a cylindrical shape by slidably fitting the movable core 32, is inserted into and fixed to the bobbin 34, and the movable core 32 is fixed by the guide collar 39. Can be stably guided.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the present invention described in the claims. It is possible.

[0055]

As described above, according to the first aspect of the present invention, the valve housing is made up of one member to reduce the number of parts, and the labor for assembling the valve housing is saved to reduce the number of assembling steps. It can be reduced and it can contribute to cost reduction. Further, the circumferential relative position of the valve housing with respect to the solenoid housing can be freely selected, and the degree of freedom in setting positions of the upstream side connecting pipe and the downstream side connecting pipe can be improved. Moreover, since the upstream side connecting pipe and the downstream side connecting pipe are integrally connected to the main part of the housing, the valve housing can be downsized in the axial direction without the need for mounting both connecting pipes, and no leak countermeasure is required. Become.

According to the second aspect of the present invention, the stepped portion for engaging the end plate and the main portion of the housing can be easily formed in the solenoid housing while eliminating the troublesome processing such as cutting. Cost reduction can be achieved.

According to the third aspect of the invention, the first and second seal members are mounted in advance and the small assembled valve seat forming portion is inserted and fixed in the valve housing, thereby connecting to the upstream connecting pipe. The valve chamber and the air chamber connected to the downstream side connecting pipe can be formed in the valve housing while maintaining the mutual sealability between both chambers and the sealability with the outside of the air chamber, thereby improving the assemblability. be able to.

According to the fourth aspect of the present invention, the force required for inserting the valve seat forming portion into the valve housing is reduced to improve the assemblability, and damage to the first seal member is avoided as much as possible. can do.

According to the fifth aspect of the present invention, it is possible to prevent the occurrence of disconnection or short circuit due to the vibration of the lead wire connected to the coil.

According to the sixth aspect of the present invention, the mold sealing body to which the coil assembly and the end plate are coupled is assembled to the valve housing to enhance the assemblability, and at the same time, the mold sealing is performed. It can ensure a seal between the inside and the outside of the body.

According to the seventh aspect of the invention, the coupler can be positioned and arranged at a predetermined position of the solenoid housing, and the circumferential displacement of the coil sealing portion in the solenoid housing can be prevented.

According to the eighth aspect of the present invention, the force required for covering the coil sealing portion with the solenoid housing is reduced to improve the assembling property and the third seal member is prevented from being damaged as much as possible. can do.

Further, according to the invention of claim 9, the second
The axial distance of the valve device can be shortened as much as possible by setting the distance between the seal member and the end plate to be small.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a valve device.

[Explanation of symbols]

5 ... Open / close valve 6 ... Solenoid 7 ... Valve housing 8: Housing main part 8a ... first hole 8b ... second hole 9 ... Upstream connection pipe 10 ... Downstream connection pipe 11 ... Valve room 12 ... Valve hole 13 ... Seat 14 ... Valve 15 ... Valve shaft 16 ... Mold sealing body 17 ... Valve seat forming part 17a ... first partition wall 17b ... second partition wall 18 ... Coil sealing part 19: First seal member 20 ... Second seal member 32 ... Movable core 33: Fixed core 34 ... Bobbin 35 ... coil 36 ... Coil assembly 37 ... Solenoid housing 37a ... small diameter hole 37b ... Large diameter hole 37c ... Benting section 37d: Fitting cylinder 38 ... End plate 38a ... Disk part 38b ... Cylindrical part 38c ... collar part 40 ... Third seal member 42 ... Annular gap 43 ... Step 44 ... Terminal 45 ... Coupler 46 ... Opening

Claims (9)

[Claims] 1. A valve housing (7) in which an upstream side connecting pipe (9) and a downstream side connecting pipe (10) are arranged in series, and a valve housing (7) communicating with the upstream side connecting pipe (9). It faces the valve chamber (11) to be formed and also has the downstream side connecting pipe (1
The valve seat (13) fixed to the valve housing (7) by opening the valve hole (12) communicating with the valve seat (13) with the valve seat (13). A valve element (14) that can be closed and is housed in the valve chamber (11) and is spring-biased to the side that opens the valve hole (12).
And an opening / closing valve (5) having a valve shaft (15) continuously penetrating the valve hole (12) in the axial direction and connected to the valve body (14); A movable core (32) continuously arranged coaxially, a fixed core (33) coaxially opposed to the movable core (32), and a bobbin (34) surrounding the movable core (32) and the fixed core (33). Coil on (35)
A coil assembly (36) formed by winding a coil, a bottomed cylindrical shape that covers the coil assembly (36) and is magnetically coupled to the fixed core (33), and the valve housing ( 7), a solenoid housing (37) made of magnetic metal and a closed end of the solenoid housing (37) sandwiching the coil assembly (36) magnetically to the solenoid housing (37). A solenoid (6) having an end plate (38) made of a magnetic metal to be joined together ;; in the valve device, the valve housing (7) has a bottomed cylindrical housing main part (8); The housing main part (8) is integrally molded with the upstream side connecting pipe (9) and the downstream side connecting pipe (10) extending laterally from the side surface of the housing main part (8).
And a valve device in which the open end of the solenoid housing (37) is caulked. 2. An annular step (4) facing the side opposite to the solenoid (6) on the outer periphery of the open end of the valve housing (7).
3) is provided, and at the open end of the solenoid housing (37), a curved portion (3) that is convexly curved inward so that the diameter increases toward the valve housing (7) side.
7c) and the open end of the housing main part (8) and the outer peripheral part of the end plate (38) are fitted to each other, and the fitting tubular part (37d) is connected to the large diameter end of the curved part (37c). ) Are provided, and the end of the fitting tubular portion (37d) on the side opposite to the curved portion (37c) has the curved portion (37).
The open end of the housing main part (8) and the end plate (38) are sandwiched between the large diameter end of (c) and the stepped part (43) of the housing main part (8). The valve device according to claim 1, which is characterized in that. 3. The housing main part (8) is fitted between the upstream connecting pipe (9) and the downstream connecting pipe (10) connected to the housing main part (8), and the outer periphery of the connecting pipe is connected to the housing main part (8). Is an annular first member that elastically contacts the inner surface of the housing main part (8).
A disk-shaped first partition wall (17a) to which the seal member (19) is attached, and a connecting portion of the downstream side connecting pipe (10) to the housing main part (8) are referred to as a first partition wall (17a). A disk-shaped second seal member (20) fitted to the housing main part (8) at a position sandwiched between the two and having an annular second seal member (20) elastically contacting the inner surface of the housing main part (8) is mounted on the outer periphery. The valve seat forming portion (17) formed by connecting the second partition wall (17b) at a plurality of circumferential positions is the housing main portion (8).
A first partition wall (17) that is inserted and fixed in the housing and forms the valve chamber (11) with the closed end of the housing main part (8).
a) is provided with a valve hole (12) penetrating the central part thereof and an annular valve seat (13) surrounding an opening end of the valve hole (12) on the valve chamber (11) side. Claim 1
Or the valve device according to 2. 4. The housing main part (8) is formed with a first hole (8a) into which the first partition wall (17a) is fitted and a diameter larger than that of the first hole (8a). The second hole (8b) into which the two partition walls (17b) are fitted, and the second partition wall (17b) is formed so that the diameter gradually increases toward the opening end side. Valve device. 5. A coil sealing portion (18) made of synthetic resin, which is molded and coupled to a coil assembly (36) so as to cover the coil (35), is fitted in a solenoid housing (37). The valve device according to claim 1. 6. The coil assembly (36) is molded and coupled so as to cover the coil (35), is fitted in a solenoid housing (37), and is resilient to the inner circumference of the solenoid housing (37). Third annular contact with
A coil sealing part (18) to which a seal member (40) is attached on the outer circumference, and first and second seal members (19, 20)
Molded body (16) made of synthetic resin integrally formed with the valve seat forming portion (17) mounted on the outer periphery of
The valve device according to claim 3 or 4, wherein the end plate (38) is embedded so that an outer peripheral portion of the end plate (38) is exposed. 7. The coil sealing portion (18) is integrally provided with a coupler (45) facing a terminal (44) connected to the coil (35), and the coupler (45) is outwardly disposed. 7. Valve device according to claim 5 or 6, characterized in that a projecting opening (46) is provided in the solenoid housing (37). 8. The solenoid housing (37) comprises:
A small-diameter hole portion (37a) having an inner diameter that elastically contacts the third seal member (40) and a small-diameter hole portion (37).
a) having a larger diameter than that of a) and having a large diameter hole portion (37b) forming an annular gap (42) between the coil sealing portion (18) and the outer periphery of the coil sealing portion (18). The valve device according to claim 6, wherein the valve device is formed so that the diameter gradually increases. 9. The end plate (38) has a disc portion (38a) in contact with an end face of the bobbin (34) on the opening / closing valve (5) side, and one end thereof is connected to the outer periphery of the disc portion (38a). And a cylindrical portion (3) surrounding a part of the bobbin (34).
8b) and a flange portion (38c) that projects radially outward from the other end of the cylindrical portion (38b) and has an outer peripheral portion projecting from the mold sealing body, and is integrally provided with the second seal member (20). 7) is attached to the outer periphery of the valve seat forming portion (17) at a position where at least a part thereof overlaps with the disk portion (38a) in a side view.