JP2002310323A - Three-way solenoid valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a three-way solenoid valve having a coil assembly housed in a solenoid housing, a magnetic metal yoke plate opposed to the coil assembly and joined to the solenoid housing, a non-magnetic material collar arranged passing through a central portion of the yoke plate for guiding the axial movement of a movable core, first and second valve seats facing to a valve chest in the housing, provided opposing each other in the valve housing with one end ranging to the yoke plate and a rod connected to a valve element adaptable to be alternatively seated on the first or second valve seat and adapted in linkage and connection with the movable core, achieving easy machining and assembly of the collar, the movable core and the rod and lower cost. SOLUTION: The synthetic resin valve housing 48 integrally ranging to a bobbin 23 via a plurality of connection holes 54 provided in the yoke plate 19 is provided with a guide portion 52 for guiding the axial movement of the rod 50. One end of the rod 50 coaxially abuts the other end of the movable core 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a three-way solenoid valve, and more particularly, to a coil assembly housed in a solenoid housing having an end wall at one end and made of magnetic metal.
A yoke plate made of a magnetic metal opposing the other end of the coil assembly is coupled to the other end of the solenoid housing, and a collar made of a non-magnetic material for guiding the axial movement of the movable core penetrates the center of the yoke plate. The first and second valve seats facing the valve chamber in the valve housing are provided on a valve housing having one end connected to the yoke plate, and the first and second valve seats are connected to the first and second valve seats. The present invention relates to an improvement of a three-way solenoid valve in which a rod that is linked to and connected to a movable core is connected to a valve body that enables an alternative seating.

[0002]

2. Description of the Related Art Conventionally, such a three-way solenoid valve is already well known, for example, from Japanese Patent Application Laid-Open No. 3-157576, in which one end of a rod is attached to a movable core guided axially by a collar. Coaxially fitted.

[0003]

However, in the above-mentioned conventional three-way solenoid valve, the movable core and the rod are substantially integrated, and the movable core alone is guided in the axial direction. The axial position of the rod will be affected by the coaxiality of the movable core and the rod, and the accuracy of the axial position of the collar that guides the movable core, and the smooth axis within the collar of the movable core and the rod and the valve housing. In order to guarantee the directional movement, the machining accuracy and the assembly accuracy of the collar for guiding the movable core, the movable core, and the rod must be increased, resulting in an increase in cost.

The present invention has been made in view of the above circumstances, and has as its object to provide a three-way solenoid valve which facilitates processing and assembly of a collar, a movable core and a rod, and enables cost reduction. .

[0005]

In order to achieve the above object, according to the first aspect of the present invention, there is provided a bobbin made of a synthetic resin having a center hole and a coil assembly provided with a coil wound around the bobbin. A fixed core housed in a solenoid housing having an end wall at one end and made of magnetic metal and magnetically coupled to the end wall is inserted into one end of the center hole and faces the fixed core. A movable metal core is inserted into the other end of the center hole, and a magnetic metal yoke plate having a through hole in the center and facing the other end of the coil assembly is coupled to the other end of the solenoid housing. A collar made of a non-magnetic material that guides the axial movement of the movable core having one end facing the fixed core is inserted into the other end of the center hole through the through hole, and one end of the collar is inserted into the yoke plate. Valve housings connected in series First and second valve seats facing a valve chamber formed in the valve housing are provided to face each other, and the first and second valve seats can be selectively seated on the valve chamber to enable the seating. In a three-way solenoid valve in which a rod that is interlocked with and connected to the movable core is connected to the valve body that is housed, a synthetic resin made of synthetic resin that is integrally connected to the bobbin through a plurality of connection holes provided in the yoke plate. The valve housing is provided with a guide portion for guiding the axial movement of the rod, and one end of the rod is coaxially abutted on the other end of the movable core.

According to such a configuration, since the movable core and the rod are separated from each other, it is not necessary to increase the processing accuracy for mutual assembly, and even if the axes of the movable core and the rod are slightly shifted. The axial movement of the movable core and the rod, which are separately guided by the collar and the guide portion, is not adversely affected, so that the collar, the movable core and the rod can be easily processed and assembled, and the cost can be reduced. . Moreover, since the bobbin, the yoke plate and the valve housing are integrally formed, the axial accuracy of the bobbin, the yoke plate and the valve housing can be easily improved.

[0007] The invention according to claim 2 provides the above-described claim 1.
In addition to the configuration of the described invention, an outward flange extending outward in the radial direction and facing the inner surface of the center hole is integrally formed at one end, and an inward flange extending radially inward is integrally formed at the other end. The collar having the collar is press-fitted into the through hole, and one end of the rod penetrating the inward flange so as to be movable in the axial direction,
It is characterized in that it is coaxially abutted on the other end of the movable core in the collar, and according to such a configuration, the collar is formed using an outward flange that does not affect the sliding of the movable core in the collar. Into the through hole of the yoke plate, it is possible to press the collar whose thickness is set as thin as possible into the through hole, thereby setting the distance between the movable core and the yoke plate as small as possible to improve the magnetic characteristics. In addition to being able to improve, the axial movement of the movable core can be stably guided by the collar fixed to the yoke plate. In addition, the other end of the collar is substantially closed by the rod, so that dust can be prevented from entering the collar as much as possible.

According to a third aspect of the present invention, in addition to the configuration of the second aspect of the present invention, the movable core has a small-diameter portion inserted into the collar and a larger diameter than the small-diameter portion. A large-diameter portion coaxially connected to one end of the small-diameter portion outside the one end in the axial direction of the collar so as to face the other end of the fixed core; According to the above, despite the fact that the collar is inserted into the center hole of the bobbin, the facing area of the movable core and the fixed core can be set relatively large, and the magnetic characteristics can be improved.

According to a fourth aspect of the present invention, in addition to the configuration of the second aspect, a cylindrical portion forming a part of the through hole is provided at a center portion of the yoke plate. According to such a configuration, the cylindrical portion is integrated with the yoke plate,
By supporting the collar for a relatively long distance in the axial direction, the inclination of the collar axis can be prevented as much as possible, and the area of the yoke plate facing the outer surface of the movable core via the collar is increased. However, the magnetic characteristics can be improved by increasing the magnetic path area.

According to a fifth aspect of the present invention, in addition to the configuration of the first aspect of the present invention, an accommodation recess is provided at one end of the bobbin so as to face the end wall of the solenoid housing. A conductive metal spring which exerts a spring force for urging the coil assembly toward the yoke plate is provided between the ground plate accommodated in the accommodating recess in connection with the coil and the end wall portion. According to such a configuration, the ground plate is conducted to the solenoid housing by using a spring for stably holding the coil assembly in the solenoid housing, and the solenoid housing is grounded, so that the ground for grounding is provided. It is not necessary to provide a terminal member, and the number of components can be reduced.

According to a sixth aspect of the present invention, in addition to the configuration of the fifth aspect of the present invention, a connecting shaft portion which closely penetrates a through hole provided in the end wall portion is integrally connected to the bobbin. A coupler support plate that is in contact with an outer surface of the end wall is integrally formed with a synthetic resin coupler that faces a terminal member connected to the coil, and is inserted into a welding hole provided in the coupler support plate. The coupling shaft portion and the coupler support plate are welded, and according to such a configuration, a coupler separate from the coil assembly can be attached to the outer surface of the end wall portion of the housing. Despite the change in the coupler shape, the versatility can be improved by eliminating the need for changing parts other than the coupler. Moreover, since the connecting shaft portion penetrates through the through hole provided in the end wall portion of the housing tightly, the position of the bobbin, that is, the coil assembly with respect to the solenoid housing in a plane perpendicular to the axis of the solenoid housing is fixed. In addition, the terminal member is fitted to the coupler so that the position of the coupler with respect to the coil assembly in a plane perpendicular to the axis of the solenoid housing can be fixed, and the end outer surface of the rigid solenoid housing is provided. Thus, the coupler can be firmly and stably fixed.

According to a seventh aspect of the present invention, in addition to the configuration of the first aspect, a guide hole having one end coaxially connected to the through hole is provided in the valve housing. A partition having a first valve hole for loosely inserting the other end of the rod disposed coaxially and a first valve seat facing the center of the first valve hole on a side opposite to the guide hole; A fitting hole having a step portion facing the opposite side to the partition wall and disposed coaxially with the guide hole so as to be interposed between the other end of the guide hole and having a second valve seat at one end; At the other end, a valve seat member provided with a regulating flange extending radially outward is formed so that the valve chamber is formed between the partition and the partition wall and the regulating flange contacts the step. According to this configuration, the valve seat is fitted and fixed in the fitting hole. In a state where the material is fitted and fixed to the valve housing, the second valve seat and the step portion of the valve housing are arranged at positions shifted in the axial direction, and the second valve seat and the regulating flange portion Only by changing the length, the position of the second valve seat corresponding to the diversification of the length and shape of the valve housing can be set, and the versatility can be improved.

According to an eighth aspect of the present invention, in addition to the configuration of the seventh aspect, the valve seat member has a second valve hole having one end opened at the center of the second valve seat. An outer peripheral portion of the filter, which is provided over the entire length in the axial direction, and faces the other end of the second valve hole, is disposed with the regulating flange of the valve seat member sandwiched between the step portion and the outer peripheral portion of the filter. The other end of the housing is swaged and engaged, and according to such a configuration, it is possible to easily assemble the valve seat member and the filter to the valve housing.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described based on embodiments of the present invention shown in the accompanying drawings.

1 to 4 show a first embodiment of the present invention. FIG. 1 is a longitudinal sectional view of a three-way solenoid valve, FIG. 2 is an enlarged sectional view taken along line 2-2 of FIG. 1, and FIG. FIG. 4 is an enlarged view of the lower part of FIG.

Referring first to FIG. 1, the three-way solenoid valve 14
Is connected to an inlet passage 11 connected to a fluid supply source (not shown) and an outlet passage 12 connected to a fluid pressure actuator (not shown).
And a state in which the discharge passage 13 and the outlet passage 12 communicating with a reservoir (not shown) are communicated with each other.
A valve portion 15 that operates to shut off the inlet passage 11 and the outlet passage 12 and to switch a state of communication between the discharge passage 13 and the outlet passage 12;
And a solenoid unit 16 that exerts an electromagnetic force for switching the operation.

Referring to FIGS. 2 and 3 together, a solenoid portion 16 includes a coil assembly 17 and the coil assembly 1.
Magnetic metal solenoid housing 1 for housing 7
8, a yoke plate 19 made of a magnetic metal coupled to the solenoid housing 18, a fixed core 20 formed integrally with the solenoid housing 18, and a movable core 21 facing the fixed core 20.

The coil assembly 17 includes a bobbin 23 made of a synthetic resin having a center hole 22, a coil 24 wound around the bobbin 23, and a covering portion 25.
For example, it is configured by winding a synthetic resin tape around a coil 24 wound around a bobbin 23.

The solenoid housing 18 has an end wall portion 18a opposed to one end in the axial direction of the coil assembly 17 at one end, and is formed in a bottomed cylindrical shape. Core 2 inserted into one end from one side
0 is an end wall 18a of the solenoid housing 18.
Is magnetically coupled to the solenoid housing 18 by, for example, being integrally connected to a central portion of the solenoid housing.

The yoke plate 19 has a through hole 26 at the center corresponding to the center hole 22 and faces the other end of the coil assembly 17. The other end is connected by caulking connection or the like. In addition, a cylindrical portion 19 a forming a part of the through hole 26 is provided at the center of the yoke plate 19 so as to protrude to the opposite side to the coil assembly 17 and is integrally provided therewith.

The movable core 21 is moved axially by a cylindrical collar 27 made of a non-magnetic material such as stainless steel.
The collar 27 is inserted into the other end of the center hole 22 while being pressed through the through hole 26 through the through hole 26. At one end of the collar 27, an outward flange 27a that protrudes radially outward and faces the inner surface of the center hole 22 is integrally provided, and at the other end of the collar 27, an outward flange protrudes radially inward. The direction flange 27b is provided integrally.

On the other hand, the movable core 21 integrally includes a small-diameter portion 21 a inserted into the collar 27 and a large-diameter portion 21 b formed to have a larger diameter than the small-diameter portion 21 a and facing the other end of the fixed core 20. The large diameter portion 21b is coaxially connected to one end of the small diameter portion 21a outside the one end in the axial direction of the collar 27. At one end of the movable core 21, a concave portion 29 for accommodating a part of a return spring 28 provided between the movable core 21 and the fixed core 20 is provided coaxially.

On the outer surface of the large-diameter portion 21b, a groove 31 forming a flow path 30 between the large-diameter portion 21b and the inner surface of the center hole 22 extends over the entire length of the large-diameter portion 21b in the axial direction.
For example, a plurality of communication holes 32 are provided in the movable core 21 and connect the flow path 30 and the concave portion 29 to each other.

A coupler 36 made of synthetic resin is disposed outside the solenoid housing 18 so that a terminal member 35 extending from the bobbin 23 is connected to one end of the coil 24 of the coil assembly 17 and faces the inside. The coupler 36 is formed integrally with a disc-shaped coupler support plate 37 that is in contact with the outer surface of the end wall 18a of the solenoid housing 18.

The end wall 18a of the solenoid housing 18
Is provided with a pair of through holes 38, 38 and a terminal through hole 39, and one end of, for example, a pair of connecting shaft portions 40, 40 penetrating through the both through holes 38, 38 is integrally connected to the bobbin 23. Is done. On the other hand, the coupler support plate 37 has the through holes 3.
A pair of welding holes 41, 41 corresponding to the welding holes 8, 38 are provided, and the end wall portions 18a of the welding holes 41, 41 are provided.
On the opposite end, tapered portions 41a, 41a having a larger diameter as the distance from the end wall portion 18a increases.

The connection holes 4 are provided in the welding holes 41, 41, respectively.
0, 40 are respectively inserted, and the other end of each connecting shaft portion 40, 40 and the coupler support plate 37 are connected to the two connecting shaft portions 40, 40.
The portion of the projection 40 protruding from the welding holes 41, 41 is thermally welded so as to be crushed in the axial direction.

Further, the two sets of the welding holes 41, 41 and the connecting shaft portions 40, 40 are arranged at positions sandwiching the coupler 36 therebetween.

The base of the terminal member 35 on the side of the bobbin 23 is formed integrally with the bobbin 23 to form the terminal through hole 39.
Is covered with a synthetic resin covering portion 42 fitted to
The terminal member 35 is bent into a substantially L-shape and fitted to the coupler 36.

A ring-shaped ground plate 43 connected to the other end of the coil 24 provided in the coil assembly 17 is housed in a housing recess 44 provided on the outer surface of one end of the bobbin 23. A spring 45 for pressing the coil assembly 17 toward the yoke plate 19 to maintain the position of the coil assembly 17 in the solenoid housing 18 constant is provided between the wall portions 18a. In addition, the spring 45 is formed of a conductive metal, and the ground plate 43 is conducted to the solenoid housing 18 via the spring 45. Further, a bracket 46 for supporting the solenoid housing 18 on a metal support member (not shown) is welded to the solenoid housing 18, and the coil 24
Is grounded via the ground plate 43, the spring 45, the solenoid housing 18, the bracket 46, and the support member.

Referring also to FIG. 4, the valve portion 15 includes a valve housing 48 made of synthetic resin, a spherical valve element 49 housed in the valve housing 48, the movable core 21 of the solenoid portion 16, Rod 50 for interlocking and connecting between valve bodies 49
And

One end of the valve housing 48 is integrally connected to the bobbin 23 of the coil assembly 17 in the solenoid portion 16. That is, the yoke plate 19 has a plurality of connection holes 5.
Are provided, and their connection holes 54, 5 are provided.
4 and a valve housing 4 integrally connected to the bobbin 23 via
8, the bobbin 23, and the yoke plate 19 sandwiched between them 48 and 23 are integrally molded.

The valve housing 48 includes a solenoid 16
A guide hole 55 having one end coaxially communicated with the through hole 26 of the yoke plate 19 provided in the first hole 61, a first valve hole 61 coaxial with the guide hole 55, and the first valve hole 61 on the opposite side to the guide hole 55 with the central portion thereof. And a partition 57 having a first valve seat 62 facing the other end, and the partition 57 is disposed coaxially with the guide hole 55 with the partition 57 interposed between the other end of the guide hole 55 and opposite to the partition 57. There is provided a fitting hole 56 in which the stepped portion 65 facing the inner surface of the end opposite to the partition wall 57 is formed.

The rod 50 is coaxially arranged in the guide hole 55, and the small diameter shaft portion 50 a provided at the other end of the rod 50 is loosely inserted into the first valve hole 61. In the guide hole 55, a metal cylindrical member functioning as a guide part 52 for guiding the axial movement of the rod 50 is press-fitted. The groove 52a is formed between the
For example, an open chamber 59 communicating with the discharge passage 13 is formed in the valve housing 48 between the yoke plate 19 of the solenoid portion 16 and the guide portion 52.

The other end of the collar 27 in the solenoid portion 16 has an inward flange 27b extending radially inward.
Is provided integrally with the other end of the collar 27, and one end of the rod 50 penetrating the inward flange 27 b so as to be movable in the axial direction coaxially abuts the other end of the movable core 21 in the collar 27. Is done. In addition, one end of the rod 50 has a spherical contact surface 50b having an imaginary center on the axis of the rod 50.
Is formed, and the corresponding contact surface 50b is
Abut on the other end.

A valve seat member 53 having a tapered second valve seat 64 at one end and a regulating flange 53a projecting outward in the radial direction at the other end forms a valve chamber 58 communicating with the outlet passage 12. An O-ring 66 formed between the partition wall 57 and fitted in the fitting hole 56 such that the regulating flange 53a is brought into contact with the step portion 64, and elastically contacts the inner surface of the fitting hole 56. Is mounted on the outer periphery of the valve seat member 53.

The valve chamber 58 includes first and second valve seats 62, 6
4, a small-diameter shaft portion 50a of a rod 50 which accommodates a seatable spherical valve element 49 and which penetrates the first valve hole 61 loosely.
Abuts on the valve element 49.

The valve seat member 53 is provided with a second valve hole 63 having one end opened at the center of the second valve seat 64 over the entire length in the axial direction, and interposed between the second valve hole 63 and the inlet passage 11. The outer peripheral portion of the filter 67 facing the other end of the second valve hole 63 is disposed with the regulating flange 53a of the valve seat member 53 interposed between the step portion 65 and the outer peripheral portion of the filter 67. The other end of the valve housing 48 is swaged by heat swaging or the like. As a result, the valve seat member 5 fitted into the fitting hole 56
3 will be fixed to the valve housing 48.

The filter 67 has a mesh member 69 supported on the inner periphery of a frame member 68 formed in a ring shape. The other end of the second valve hole 63 has a large-diameter end connected to the frame member 68. A tapered hole portion 63a formed so as to have a larger diameter toward the filter 67 while corresponding to the inner diameter of the filter 67 is provided coaxially.

The valve seat member 53 is formed of a metal or a synthetic resin. When the metal valve seat member 53 is used, the second valve seat 64 of the second valve seat 64 may be used.
4. It is possible to improve the shape accuracy and improve the sheet properties,
When the valve seat member 53 is made of a synthetic resin, the manufacturing of the valve seat member 53 is facilitated, and the cost can be reduced.

Next, the operation of the first embodiment will be described. When the coil 24 of the solenoid portion 16 is energized, the movable core 21 is fixed against the fixed core 2 against the spring force of the return spring 28.
It is sucked to the 0 side. Therefore, in a state where the fluid pressure is acting on the second valve hole 63 from the inlet passage 11 via the filter 67, the valve element 49 is pushed up so as to be separated from the second valve seat 64 and the first valve seat Sit at 62. Therefore, the second valve hole 63 is opened and the first valve hole 61 is closed, so that the inlet passage 11 communicates with the outlet passage 12 and the space between the outlet passage 12 and the discharge passage 13 is shut off.

On the other hand, when the energization of the coil 24 of the solenoid 16 is stopped, the movable core 21 operates in the direction away from the fixed core 20 by the spring force of the return spring 28.
Therefore, the valve element 49 is pressed by the rod 50 so as to be separated from the first valve seat 62 and seated on the second valve seat 64. Therefore, the first valve hole 61 is opened and the second valve hole 63 is closed, so that the outlet passage 12 communicates with the discharge passage 13 and the space between the outlet passage 12 and the inlet passage 11 is shut off.

In such a three-way solenoid valve 14, the connecting portion 40, 40 made of synthetic resin penetrates through the through holes 38, 38 provided in the end wall portion 18 a of the solenoid housing 18 in the solenoid portion 16. Is connected to the bobbin 23 at one end, and is integrally formed with a coupler 36 separate from the coil assembly 17, and a coupler support plate 37 which is in contact with the outer surface of the end wall portion 18 a. The other end portions of the connecting shaft portions 40, 40 inserted into the welding holes 41, 41 are welded,
Terminal member 35 penetrating through terminal through hole 39 of end wall portion 18a
Are fitted to the coupler 36. Therefore, the coil assembly 1
7 can be attached to the outer surface of the end wall portion 18a of the solenoid housing 18.
Despite the change in the shape, the versatility can be improved by eliminating the need to change the parts other than the coupler 36. Moreover, since the connecting shafts 40, 40 and the bobbin 23 are formed integrally, it is possible to avoid an increase in the number of parts and an increase in the number of assembling steps due to the provision of the connecting shafts 40, 40.

The coupler support plate 37 and the connecting shaft 4
In welding 0, 40, portions of the connecting shafts 40, 40 projecting from the welding holes 41, 41 are crushed in the axial direction and are thermally welded to the coupler support plate 37. The coupler supporting plate 37 and the connecting shafts 40, 40 can be welded without using expensive welding equipment and jigs, and inexpensive equipment and jigs by heat welding can be used. At this time, the tapered portions 41a, 41a having a larger diameter as the distance from the end wall portion 18a is provided at the end of the welding holes 41, 41 opposite to the end wall portion 18a. , 41 in the direction perpendicular to the axial direction can be increased.

Further, the connecting shaft portions 40, 40 are formed in the through holes 38, 3 formed in the end wall portion 18a of the solenoid housing 18.
8, the position of the bobbin 23, that is, the coil assembly 17 with respect to the solenoid housing 18 in a plane perpendicular to the axis of the solenoid housing 18 can be fixed, and the terminal member 35 is fitted to the coupler 36. As a result, the coupler 3 for the coil assembly 17 in a plane orthogonal to the axis of the solenoid housing 18
6 can be fixed, and a coupler 36 is provided on the outer surface of the end wall 18a of the rigid solenoid housing 18.
Can be firmly and stably fixed.

Further, two pairs of welding holes 41 and 4 forming a pair are formed.
1 and the connecting shaft portions 40, 40 are arranged at positions sandwiching the coupler 36 therebetween, so that the mounting and fixing of the coupler 36 to the outer surface of the end wall portion 18a provided in the solenoid housing 18 are ensured. Since the coupler support plate 37 is formed in a disk shape, the load strength of the coupler 36 in the entire circumferential direction of the solenoid housing 18 can be increased.

The base of the terminal member 35 on the bobbin 23 side is
The bobbin 23 is formed integrally with the bobbin 23 and is covered with a synthetic resin covering portion 42 fitted into the terminal through-hole 39 to insulate the terminal member 35 and the solenoid housing 18 from each other. The guide portion 42 can be used for positioning the coupler 36 and the connecting shaft portions 40 and 40 are connected to the solenoid housing 1.
8, the bobbin 23 and the coupler 3 with respect to the solenoid housing 18 are coupled.
6 can be more firmly positioned.

Further, a collar 27 made of a non-magnetic material for guiding the axial movement of the movable core 21 is pressed into the through hole 26 so as to pass through the through hole 26 provided at the center of the yoke plate 19. The outward flange 27a that projects radially outward and faces the inner surface of the center hole 22 of the bobbin 23 is
7 are integrally provided at one end of the outer flange 7, so that the outward flange 2 does not affect the sliding of the movable core 21 in the collar 27.
It is possible to press-fit the collar 27 into the through-hole 26 of the yoke plate 19 using the 7a, and by doing so, it is possible to press-fit the collar 27 whose thickness is set as thin as possible into the through-hole 26, As a result, the magnetic characteristics can be improved by setting the distance between the movable core 21 and the yoke plate 19 as small as possible, and the axial movement of the movable core 21 can be stabilized by the collar 27 fixed to the yoke plate 19. I can guide you.

At the center of the yoke plate 19, the through hole 26 is formed.
Of the yoke plate 1 is integrally provided so as to protrude to the side opposite to the coil assembly 17.
The cylindrical portion 19a integral with the support member 9 supports the collar 27 over a relatively long distance in the axial direction so that the axis of the collar 27 can be prevented from tilting as much as possible. Thus, the area of the portion facing the outer surface of the movable core 21 can be increased, and the magnetic characteristics can be improved by increasing the magnetic path area.

The movable core 21 has a small-diameter portion 21 a inserted into the collar 27, and is formed to have a larger diameter than the small-diameter portion 21 a so as to face the other end of the fixed core 20. The small diameter portion 21 outside the one end in the direction
a is integrally provided with a large-diameter portion 21 b coaxially connected to one end of the bobbin 23.
Despite being inserted into the yoke plate 1, the opposing area of the movable core 21 and the fixed core 20 is set relatively large.
9, the magnetic characteristics can be further improved in combination with the area of the portion facing the outer surface of the movable core 21 via the collar 27 being increased.

The movable core 21 is provided at one end of the movable core 21.
A concave portion 29 for accommodating a part of a return spring 28 provided between the fixed core 20 and the fixed core 20 is provided coaxially, and the movable core 21 is provided despite the provision of the large-diameter portion 21 b on one end side of the movable core 21. The weight can be reduced, and the movable core 21 can be quickly moved in the axial direction. Also, the large diameter portion 21b
The groove 31 forming the flow path 30 between the inner surface of the center hole 22 and the groove 31 is provided to extend over the entire length of the large diameter portion 21b in the axial direction. Accordingly, the fluid is moved between both ends of the large-diameter portion 21b, which can contribute to the rapid axial movement of the movable core 21. Further, at one end of the movable core 21, there is provided a communication hole 32 connecting the flow path 30 and the recess 29, so that the movement of the fluid accompanying the axial movement of the movable core 21 is further smoothed, and thereby the movable core 21 is movable. The core 21 can be moved more quickly.

The movable core 21 and the rod 50 are separated from each other so that one end of a rod 50 of the valve portion 15 is in contact with the other end of the movable core 21 of the solenoid portion 16. Therefore, it is not necessary to increase the processing accuracy, and even if the axes of the movable core 21 and the rod 50 are slightly displaced, the collar 27 and the guide 52
There is no adverse effect on the axial movements of the movable core 21 and the rod 50, which are separately guided, so that the processing and assembly of the collar 27, the movable core 21 and the rod 50 are facilitated, and the cost can be reduced. .

The valve housing 48 of the valve portion 15 is connected to the bobbin 23 through a plurality of connecting holes 54 provided in the yoke plate 19 of the solenoid portion 16 so as to be integrally connected.
The valve housing 48, the bobbin 23 and the yoke plate 19
Are integrally molded, so that the axial accuracy of the bobbin 23, the yoke plate 19, and the valve housing 48 can be easily improved.

Moreover, an inward flange 27 extending radially inward.
b is provided integrally with the other end of the collar 27, and one end of the rod 50 penetrating the inward flange 27 b so as to be movable in the axial direction is coaxially abutted with the other end of the movable core 21 in the collar 27. Therefore, the other end of the collar 27 is substantially closed by the rod 50, and dust can be prevented from entering the collar 27 as much as possible.

Further, one end of the rod 50 is
A spherical contact surface 50b having an imaginary center on the axis of 0 is formed, and the contact surface 50b contacts the other end of the movable core 21, so that a force in a direction off the axis is applied to the movable core 21.
, The axial movement of the rod 50 can be prevented from being affected.

At one end of the bobbin 23, a housing recess 44 is provided which is open to face the end wall portion 18a of the solenoid housing 18. The ground plate 43 is connected to the coil 24 and housed in the housing recess 44. The end wall 18a
A conductive metal spring 45 exerting a spring force for urging the coil assembly 17 toward the yoke plate 19 is provided therebetween. As a result, the ground plate 43 is conducted to the solenoid housing 18 using the spring 45 for stably holding the coil assembly 17 in the solenoid housing 18.
Since the solenoid housing 18 is grounded, it is not necessary to provide a ground terminal member, and the number of components can be reduced.

In fitting and fixing the valve seat member 53 of the valve housing 48 in the valve portion 15, the other end of the valve seat member 53 having the second valve seat 64 at one end projects radially outward. A regulating flange 53a is provided, and the valve housing 4
8 has a stepped portion 65 that abuts against the regulating flange 53a when the valve seat member 53 is fitted to regulate the moving end of the valve seat member 53 in the fitting direction.
Is provided. Therefore, in a state where the valve seat member 53 is fitted and fixed to the valve housing 48, the second valve seat 64 and the step portion 65 of the valve housing 48 are arranged at positions shifted in the axial direction. 2 valve seat 64 and regulating flange 53a
Only by changing the length of the gap, the position of the second valve seat 64 can be set in accordance with the diversification of the length and shape of the valve housing 48, and the versatility can be improved.

Further, the second valve seat 64 is formed in a tapered shape, so that the spherical valve element 49 can be seated on the second valve seat 64 so as to maintain a stable seating state when the valve is closed. it can.

In order to fit the valve seat member 53, a fitting hole 56 which opens on the other end side of the valve housing 48 on the opposite side to the solenoid housing 18 of the solenoid portion 16 is coaxial with the axis of the movable core 21. The fitting hole 56
The regulating flange 53a is brought into contact with the annular stepped portion 65 formed on the inner surface of the middle portion of the valve member. An O-ring 66 that comes into contact with the valve housing is mounted, and the valve seat member 53 can be fitted into the valve housing 48 while maintaining the sealing property between the valve chamber 58 and the outside.

Further, the valve seat member 53 is provided with a second valve hole 63 having one end opened in the center of the second valve seat 64 over the entire length in the axial direction, and a filter facing the other end of the second valve hole 63. The outer peripheral portion of the valve 67 is disposed with the regulating flange 53a of the valve seat member 53 interposed between the step portion 65 and the other end of the valve housing 48 is swaged and engaged with the outer peripheral portion of the filter 67. Valve housing 4 of seat member 53 and filter 67
8 can be easily assembled.

The filter 67 has a mesh member 69 supported on the inner periphery of a frame member 68 formed in a ring shape. The other end of the second valve hole 63 has a large-diameter end with a frame member. 68
A tapered hole portion 63a having a larger diameter toward the filter 67 while corresponding to the inner diameter of the filter 67 is coaxially provided, and the fluid flows through almost the entire mesh member 69 of the filter 67. Resistance can be suppressed.

FIGS. 5 and 6 show a second embodiment of the present invention. FIG. 5 is a longitudinal sectional view of a valve section corresponding to FIG.
FIG. 6 is a sectional view taken along line 6-6 of FIG.

At one end of a valve seat member 53 'fitted and fixed to the valve housing 48, a spherical valve body 49 housed in a valve chamber 58 facing one end of the valve seat member 53 is provided with a valve seat. A plurality of valve body guides 70, 70,... That come into contact with each other at a plurality of locations around the axis of the member 53 ', for example, at four locations, are integrally connected.

According to the second embodiment, in addition to the effects of the first embodiment, the valve element 49 is connected to the first and second valve seats 62,
64 can be accurately guided.

FIG. 7 shows a modification of the second embodiment, in which a valve body guide portion 7 extends along the circumferential direction of a valve seat member 53 '.
The length of 0 ', 70' ... may be set longer than the valve body guides 70, 70 ... shown in FIG.

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 appended claims. It is possible.

[0066]

As described above, according to the first aspect of the present invention, the processing and assembly of the collar, the movable core and the rod can be facilitated, the cost can be reduced, and the bobbin, the yoke plate and the valve housing are obtained. Can be easily improved.

According to the second aspect of the present invention, the distance between the movable core and the yoke plate can be set as small as possible to improve the magnetic characteristics, and the movable core can be moved in the axial direction by the yoke plate. The guide can be stably guided by the fixed collar, and the other end of the collar is almost completely closed by the rod, so that dust can be prevented from entering the collar as much as possible.

According to the third aspect of the present invention, even though the collar is inserted into the center hole of the bobbin, the facing area between the movable core and the fixed core is set relatively large, and the magnetic characteristics can be improved. it can.

According to the fourth aspect of the present invention, the inclination of the axis of the collar can be prevented as much as possible, and the area of the portion of the yoke plate facing the outer surface of the movable core via the collar can be increased. Magnetic characteristics can be improved by increasing the magnetic path area.

According to the fifth aspect of the present invention, the ground plate is conducted to the solenoid housing by using a spring for stably holding the coil assembly in the solenoid housing, and the solenoid housing is grounded. It is not necessary to provide a ground terminal member, and the number of components can be reduced.

According to the sixth aspect of the present invention, a coupler separate from the coil assembly can be attached to the outer surface of the end wall of the housing. This makes it possible to increase the versatility by eliminating the need for changing the position of the bobbin, that is, the coil assembly with respect to the solenoid housing in a plane perpendicular to the axis of the solenoid housing. The position of the coupler with respect to the coil assembly in an orthogonal plane can be fixed, and the coupler can be firmly and stably fixed to the outer end of the rigid solenoid housing.

According to the seventh aspect of the present invention, the position of the second valve seat corresponding to the diversification of the length and shape of the valve housing only by changing the length between the second valve seat and the regulating flange. Setting is possible, and versatility can be improved.

According to the eighth aspect of the present invention, the valve seat member and the filter can be easily assembled to the valve housing.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a three-way solenoid valve according to a first embodiment.

FIG. 2 is an enlarged sectional view taken along line 2-2 of FIG.

FIG. 3 is an exploded perspective view of a solenoid unit.

FIG. 4 is an enlarged view of a lower part of FIG. 2;

FIG. 5 is a longitudinal sectional view of a valve section corresponding to FIG. 4 of the second embodiment.

FIG. 6 is a sectional view taken along line 6-6 in FIG. 5;

FIG. 7 is a sectional view corresponding to FIG. 6 for illustrating a modification of the second embodiment.

[Explanation of symbols]

 14 ... three-way solenoid valve 17 ... coil assembly 18 ... solenoid housing 18 a ... end wall 19 ... yoke plate 19 a ... cylindrical part 20 ... fixed core 21 ... movable Core 21a ・ ・ ・ Small diameter part 21b ・ ・ ・ Large diameter part 22 ・ ・ ・ Center hole 23 ・ ・ ・ Bobbin 24 ・ ・ ・ Coil 26 ・ ・ ・ Through hole 27 ・ ・ ・ Collar 27a ・ ・ ・ Outward flange 27b ・··· Inward flange 35 ··· Terminal member 36 ··· Coupler 37 ··· Coupler support plate 38 ··· Transparent hole 40 ··· Connection shaft 41 ······················ ··· Housing recess 45 ··· Spring 48 ··· Valve housing 49 ··· Valve body 50 ··· Rod 52 ··· Guide part 53 ··· Valve seat member 53a ··· Restriction flange 54 ··· Connection hole 55: Guide hole 56: Fitting hole 57: Spacing 58 ... valve chamber 61 ... first valve hole 62 ... first valve seat 63 ... second valve hole 64 ... second valve seat 65 ... stepped portion 67 ... filter

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masayuki Shibata 197-1 Kakuda Jiryu, Kakuda City, Miyagi Prefecture Inside Keihin Kakuda Development Center Co., Ltd. 1 Inside Keihin Kakuda Development Center Co., Ltd. (72) Noboru Hino 197-1 Kakuda Jiryu, Kakuda City, Miyagi Prefecture F-term (reference) 3H066 AA01 BA38 3H106 DA07 DA13 DB02 DB12 DB23 DB32 DC04 DC18 DD09 EE35 GA06 GA10 GB05 JJ04

Claims (8)

[Claims] 1. A coil assembly (17) comprising a synthetic resin bobbin (23) having a central hole (22) and a coil (24) wound around the bobbin (23) has an end wall at one end. A stationary core (20) housed in a solenoid housing (18) made of a magnetic metal and having an end (18a) and magnetically coupled to the end wall (18a) has one end of the center hole (22). Side, and the fixed core (2
The movable core (21) facing the center hole (22)
The yoke plate (19) made of a magnetic metal and having a through hole (26) at the center and facing the other end of the coil assembly (17) is inserted into the solenoid housing (1).
8) a collar (27) made of a non-magnetic material for guiding the axial movement of the movable core (21), one end of which is opposed to the fixed core (20), through the through hole (26). The valve housing (4) is inserted through the other end of the center hole (22) and has one end connected to the yoke plate (19).
8), first and second valve seats (62, 64) facing a valve chamber (58) formed in the valve housing (48) are provided to face each other, and the first and second valve seats are provided. (62, 6
4) A rod (50) connected to and linked to the movable core (21) is connected to a valve element (49) accommodated in the valve chamber (58) so as to be able to be selectively seated on the three-way. In the solenoid valve, the rod (50) is attached to the synthetic resin valve housing (48) integrally connected to the bobbin (23) through a plurality of connection holes (54) provided in the yoke plate (19). A guide portion (52) for guiding the axial movement of the movable core (2) is provided.
A three-way solenoid valve, which is coaxially abutted on the other end of 1). 2. The center hole (2) projecting radially outward.
An inward flange (27a) integrally formed at one end with an outward flange (27a) facing the inner surface of (2) and extending inward in the radial direction.
The collar (27) integrally having b) at the other end is press-fitted into the through hole (26), and one end of the rod (50) penetrating the inward flange (27b) movably in the axial direction.
2. The three-way solenoid valve according to claim 1, wherein the other end of the movable core (21) is coaxially abutted in the collar (27). 3. The movable core (21) has a small diameter portion (21a) inserted into the collar (27), and has a diameter larger than the small diameter portion (21a).
And a large-diameter portion (21b) coaxially connected to one end of the small-diameter portion (21a) outside the one axial end of the collar (27) so as to face the other end of the collar (27). The three-way solenoid valve according to claim 2, further comprising: 4. A cylindrical portion (19a) forming a part of the through hole (26) at a center of the yoke plate (19).
3. The three-way solenoid valve according to claim 2, wherein the valve member is provided integrally with the coil assembly so as to protrude on a side opposite to the coil assembly. 5. An end portion of the bobbin (23) is provided with a housing recess (44) which is open to face an end wall (18a) of the solenoid housing (18). A spring force for urging the coil assembly (17) toward the yoke plate (19) between the ground plate (43) which is continuously received in the receiving recess (44) and the end wall (18a). 3. The three-way solenoid valve according to claim 1, further comprising a conductive metal spring (45) for performing the following. 6. A connecting shaft portion (40) which closely penetrates a through hole (38) provided in said end wall portion (18a), is integrally connected to said bobbin (23), and said coil (24). A coupler support plate (37) abutting on the outer surface of the end wall portion (18a) is integrally formed with a synthetic resin coupler (36) facing a terminal member (35) connected to the coupler support plate. The three-way solenoid valve according to claim 1, wherein the coupling shaft (40) inserted into the welding hole (41) provided in the (37) and the coupler support plate (37) are welded. 7. A guide hole (5) having one end coaxially connected to the through hole (26) in the valve housing (48).
5) and a first valve hole (61) for loosely inserting the other end of the rod (50) coaxially arranged in the guide hole (55) and a first valve hole on the opposite side to the guide hole (55). A partition (57) having a first valve seat (62) facing the center of the valve hole (61), and the partition (57) is connected to the guide hole (5).
A fitting hole (56) interposed between the other end of 5) and coaxial with the guide hole (55) and having a step (65) facing the side opposite to the partition wall (57) is formed. A valve seat member (53) having a second valve seat (64) at one end and a regulating flange (53a) projecting outward in the radial direction at the other end is provided with a valve seat (58). The fitting hole (5) is formed between the partition wall (57) and the regulating flange (53a) is brought into contact with the step (65).
The three-way solenoid valve according to claim 1, wherein the three-way solenoid valve is fitted and fixed to (6). 8. An end of the valve seat member (53) is a second end.
A second valve hole (63) opened in the center of the valve seat (64) is provided over the entire length in the axial direction, and the outer peripheral portion of the filter (67) facing the other end of the second valve hole (63) is the valve seat. Member (5
3) The regulating flange (53a) is interposed between the step (65) and the step (65), and the other end of the valve housing (48) is swaged to the outer periphery of the filter (67). The three-way solenoid valve according to claim 7, wherein: