JP2002310328A - Solenoid valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solenoid valve having a coil assembly housed in a solenoid housing with an end wall portion at one end, a movable core opposed to a fixed core magnetically joined to the end wall portion and inserted into one end of a center hole, and inserted into the other end of the center hole, a yoke plate opposed to the other end of the coil assembly and joined to the other end of the solenoid housing, a non-magnetic material collar arranged at the other end of the center hole passing through a central portion of the yoke plate for guiding the axial movement of the movable core, and a rod connected to a valve element housed in a valve housing ranging to the solenoid housing 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: A guide portion 52 for guiding the axial movement of the rod 50 is provided in the valve housing 48. 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 solenoid valve, and more particularly to a solenoid valve, in which a coil assembly is housed in a solenoid housing made of a magnetic metal having an end wall at one end and is magnetically coupled to the end wall. The movable core facing the fixed core inserted at one end of the hole is inserted at the other end of the center hole, and the magnetic metal yoke plate facing the other end of the coil assembly is connected to the other end of the solenoid housing. A collar made of a non-magnetic material for guiding the axial movement of the movable core is inserted into the other end of the center hole through the center of the yoke plate, and is housed in a valve housing connected to the solenoid housing. The present invention relates to an improvement in an electromagnetic valve in which a rod that is linked to and connected to a movable core is connected to a valve body to be connected.

[0002]

2. Description of the Related Art Conventionally, such an electromagnetic valve has been already well known, for example, from Japanese Patent Application Laid-Open No. 3-157576, in which one end of a rod is coaxially fitted to a movable core.

[0003]

However, in the above-described conventional solenoid valve, the movable core and the rod are substantially integrated, and the movable core alone is guided in the axial direction. Is affected by the coaxiality of the movable core and the rod, and the accuracy of the axial center position of the collar that guides the movable core, and the smooth axial direction within the collar of the movable core and the rod and the valve housing. In order to guarantee the 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, and the cost is increased.

The present invention has been made in view of such circumstances, and has as its object to provide a 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 is inserted into the other end of the center hole through the through hole, and is housed in a valve housing connected to the yoke plate. The movable valve A guide portion for guiding the axial movement of the rod is provided in the valve housing, and one end of the rod coaxially abuts the other end of the movable core. It is characterized by being performed.

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. .

[0007] The invention according to claim 2 provides the above-described claim 1.
In addition to the configuration of the invention described in the above, the collar having one end with an outward flange which protrudes outward in the radial direction and faces the inner surface of the center hole at one end is press-fitted into the through hole. For example, the collar whose thickness is set as thin as possible is pressed into the through-hole by pressing the collar into the through-hole of the yoke plate using an outward flange that does not affect the sliding of the movable core in the collar. It is possible to improve the magnetic characteristics by setting the distance between the movable core and the yoke plate as small as possible, and the axial movement of the movable core is stabilized by the collar fixed to the yoke plate. Can guide you.

According to a third aspect of the present invention, in addition to the configuration of the second aspect, an inward flange extending radially inward is provided integrally with the other end of the collar, and Characterized in that one end of the rod penetrating axially movably is coaxially abutted with the other end of the movable core in the collar, and according to such a configuration, the other end of the collar is substantially connected to the rod. As a result, the dust can be prevented from entering the collar as much as possible.

According to a fourth aspect of the present invention, in addition to the configuration of the first aspect of the present invention, 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 or fourth aspect, 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 integrally provided coaxially with one end of the small-diameter portion outside the one axial end of the collar so as to face the other end of the fixed core, According to this configuration, the facing area between the movable core and the fixed core is set relatively large, and the magnetic characteristics can be improved, even though the collar is inserted into the center hole of the bobbin. In addition, the magnetic characteristics can be further improved in combination with the increase in the magnetic path area according to the configuration of the fourth aspect of the present invention.

According to a sixth aspect of the present invention, in addition to the configuration of the fifth aspect of the present invention, one end of the movable core accommodates a part of a return spring provided between the movable core and the fixed core. Characterized in that the recess is provided coaxially,
According to such a configuration, despite the provision of the large-diameter portion on one end side of the movable core, it is possible to reduce the weight of the movable core and enable the movable core to move quickly in the axial direction.

According to a seventh aspect of the present invention, in addition to the configuration of the fifth aspect, a groove forming a flow path between the outer surface of the large-diameter portion and the inner surface of the center hole is large. It is characterized by being provided so as to extend over the entire axial length of the radial portion, and according to such a configuration, the fluid is moved between both ends of the large-diameter portion along with the axial movement of the movable core, whereby This can contribute to rapid axial movement of the movable core.

According to an eighth aspect of the present invention, in addition to the configuration of the seventh aspect, at one end of the movable core, a part of a return spring provided between the movable core and the fixed core is housed. And a communication hole connecting the flow path and the recess is provided. According to this configuration, the movement of the fluid accompanying the axial movement of the movable core can be more smoothly performed. And the movable core can be moved more quickly.

According to a ninth aspect of the present invention, in addition to the configuration of the first aspect of the present invention, one end of the rod has
A spherical contact surface having a virtual center on the axis of the rod is formed, and the contact surface is in contact with the other end of the movable core. According to such a configuration, the contact is off the axis. Even if a directional force is applied from the movable core to the rod, the axial movement of the rod is not affected.

[0015]

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

1 to 4 show one embodiment of the present invention. FIG. 1 is a longitudinal sectional view of a three-way solenoid valve, and FIG.
FIG. 3 is an exploded perspective view of a solenoid portion,
FIG. 4 is an enlarged view of the lower part of FIG.

First, in 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 FIG. 2 and FIG. 3, the 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 synthetic resin bobbin 23 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 is formed in a cylindrical shape with a bottom having an end wall portion 18a opposed to one end in the axial direction of the coil assembly 17 at one end. 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 corresponding to the center hole 22 at the center thereof 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 a 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.

End wall 18a of 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 bobbin 23 side is formed integrally with the bobbin 23 so that 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 earth 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 section 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 first and second valve seats 62, 6 are provided in the valve chamber 58.
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 with 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 made of metal or synthetic resin. When the valve seat member 53 is made of metal, the second valve seat 64 of the second valve seat 64 can 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 this 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 20 against the spring force of the return spring 28.
Sucked on the side. For this reason, the filter 6
In a state where the fluid pressure is acting on the second valve hole 63 via the valve 7, the valve body 49 is pushed up so as to be separated from the second valve seat 64 and is seated on the first valve seat 62. Therefore, the second valve hole 6
3, the first valve hole 61 is closed, 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 power supply to the coil 24 of the solenoid section 16 is stopped, the movable core 21 operates in a 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, in the solenoid portion 16, the connecting shaft portions 40, 40 made of synthetic resin penetrating through holes 38, 38 provided in the end wall portion 18 a of the solenoid housing 18. 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 provided with 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, 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 provided.
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.

One end of the movable core 21 is
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 the 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 receiving recess 44 is provided which is open to face the end wall 18a of the solenoid housing 18. The ground plate 43 is connected to the coil 24 and received in the receiving 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.

The second valve seat 64 is formed in a tapered shape, so that the spherical valve element 49 can improve the seating property of the second valve seat 64 and 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 side opposite 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 for exposing 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.

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.

[0063]

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 are facilitated, and the cost can be reduced.

According to the second aspect of the present invention, it is possible to press-fit a collar whose wall thickness is set as small as possible into the through-hole, and set the distance between the movable core and the yoke plate as small as possible to improve the magnetic characteristics. Can be improved,
The axial movement of the movable core can be stably guided by the collar fixed to the yoke plate.

According to the third aspect of the present invention, 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 the fourth aspect of the present invention, the cylindrical portion integral with the yoke plate supports the collar over a relatively long distance in the axial direction, thereby minimizing the inclination of the collar axis. Further, the area of a portion of the yoke plate facing the outer surface of the movable core via the collar can be increased, and the magnetic characteristics can be improved by increasing the magnetic path area.

According to the fifth 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 sixth aspect of the present invention, the movable core can be reduced in weight and the movable core can be moved quickly in the axial direction despite the provision of the large-diameter portion at one end of the movable core. it can.

According to the seventh aspect of the present invention, the fluid is moved between both ends of the large-diameter portion in accordance with the axial movement of the movable core, thereby contributing to the rapid axial movement of the movable core. be able to.

According to the eighth aspect of the present invention, the movement of the fluid accompanying the axial movement of the movable core can be made smoother, whereby the movable core can be moved more quickly.

According to the ninth aspect of the present invention, even if a force in a direction off the axis extends from the movable core to the rod,
The axial movement of the rod is not affected.

[Brief description of the drawings]

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.

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

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

[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 28 ··· Return spring 29 ··· Recess 30 ··· Channel 31 ·· Groove 32 ··· Communication hole 48 ··· Valve housing 49 ··· Valve 50 ··· Rod 50b: contact surface 52: guide portion

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Masayuki Shibata 197-1 Kakuda Jiryu, Kakuda City, Miyagi Prefecture Keihin Kakuda Development Center Co., Ltd. (72) Inventor Shigeto Ryuen 197- Kakuda Jiryu, Kakuda City, Miyagi Prefecture 1 Keihin Kakuda Development Center Co., Ltd. (72) Noboru Hino 197-1 Kakuda Jiryu, Kakuda City, Miyagi Prefecture F-term (reference) 3H106 DA08 DA22 DB02 DB12 DB23 DB32 DC02 DC18 DD09 DD10 EE16 EE35 EE36 GA15 JJ04

Claims (9)

[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).
A collar (27) made of a non-magnetic material, which is coupled to the other end of (8) and guides the axial movement of the movable core (21), penetrates through the through hole (26) and is connected to the center hole (22). A rod (50) which is inserted into the other end and is accommodated in a valve body (49) accommodated in a valve housing (48) connected to the yoke plate (19) and linked to the movable core (21). ) Is connected, a guide portion (52) for guiding the axial movement of the rod (50) is provided in the valve housing (48), and one end of the rod (50) is connected to the movable core (21). ) Is coaxially abutted on the other end of the solenoid valve. 2. The center hole (2) projecting radially outward.
The solenoid valve according to claim 1, wherein the collar (27) having an outward flange (27a) at one end facing the inner surface of (2) is press-fitted into the through hole (26). 3. 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 (27b) so as to be movable in the axial direction is movable in the collar (27). 3. The solenoid valve according to claim 2, wherein the solenoid valve is coaxially abutted on the other end of the core. 4. A cylindrical portion (19a) forming a part of the through hole (26) at a center of the yoke plate (19).
2. A solenoid valve according to claim 1, wherein the solenoid valve is provided integrally with the coil assembly so as to protrude in a direction opposite to the coil assembly. 5. The movable core (21) has a small diameter portion (21a) inserted into the collar (27), and has a larger diameter 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 end in the axial direction of the collar (27) so as to face the other end of the collar (27). The solenoid valve according to claim 1, wherein the solenoid valve is provided. 6. A concave portion (29) for accommodating a part of a return spring (28) provided between the movable core (21) and the fixed core (20) at one end of the movable core (21).
The solenoid valve according to claim 5, wherein the solenoid valve is provided coaxially. 7. A groove (31) for forming a flow path (30) between the outer surface of the large diameter portion (21b) and the inner surface of the center hole (22) is provided on the axis of the large diameter portion (21b). 6. The device according to claim 5, wherein the device is provided so as to extend over the entire length in the direction.
The described solenoid valve. 8. 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 coaxial with one end of the movable core (21). The solenoid valve according to claim 7, further comprising a communication hole (32) provided between the flow path (30) and the recess (29). 9. A spherical contact surface (50b) having an imaginary center on the axis of the rod (50) is formed at one end of the rod (50), and the contact surface (50b) is movable. The solenoid valve according to claim 1, wherein the solenoid valve is in contact with the other end of the core (21).