JP4109954B2 - 3-way solenoid valve - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a three-way solenoid valve, and in particular, a cylindrical housing main portion surrounding a coil assembly in which a coil is wound around a synthetic resin bobbin having a center hole, and opposite one end of the bobbin. A first end wall that closes one end of the housing main portion, and a second end that is opposite to the other end of the bobbin and that closes the other end of the housing main portion and has a through hole coaxial with the center hole. A magnetic metal solenoid housing is constituted by the wall, a fixed core magnetically coupled to the first end wall is inserted into one end side of the center hole, and the fixed core is inserted into the other end side of the center hole. A cylindrical valve body that is inserted into the second end wall so as to surround a part of the movable core and that is coaxially connected to the second end wall, and extends to the opposite side of the solenoid housing One end of the second end wall It is coaxially connected to the first and can be seated valve body in a second valve seat disposed in the valve in the body, in conjunction with the movable core, an improvement of three-way solenoid valve to be connected.
[0002]
[Prior art]
Conventionally, in such a three-way solenoid valve, a first end wall is integrally formed at one end of the housing main part, and the other end of the housing main part is provided on the outer periphery of a bowl-shaped second end wall provided integrally with the valve body. By caulking and coupling, the valve body is coaxially connected to the solenoid housing (see, for example, Patent Document 1).
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 9-280391 [0004]
[Problems to be solved by the invention]
However, in the structure in which the solenoid housing and the valve body are connected coaxially by caulking connection as in the conventional one, the strength of the caulking coupling portion is relatively weak and the connection strength between the solenoid housing and the valve body is excellent. Is hard to say.
[0005]
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a three-way solenoid valve in which the connection strength between the solenoid housing and the valve body is sufficiently increased.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, a first aspect of the present invention is directed to a housing main portion surrounding a coil assembly in which a coil is wound around a synthetic resin bobbin having a center hole, and opposed to one end of the bobbin. A first end wall that closes one end of the housing main portion, a second end that is opposite to the other end of the bobbin, closes the other end of the housing main portion, and has a through hole coaxial with the center hole. A solenoid housing made of magnetic metal is configured with the two end walls, and a fixed core magnetically coupled to the first end wall is inserted into one end side of the center hole, and the other end side of the center hole is A cylindrical core that is inserted into a movable core that faces the fixed core and that surrounds a part of the movable core and that is coaxially connected to the second end wall is inserted, and extends in a direction opposite to the solenoid housing. One end of the valve body It provided continuously to the end wall coaxially, first and second valve seats to be seated valve body that is disposed in the bulb body, in conjunction with the movable core, is connected, a terminal member connected to one end of the coil coupler for exposing the said is attached to the solenoid housing, the terminal member is embedded in one end of the base end is formed from conductive metal plates bobbin, a three-way solenoid valve that will be fixed,
An axial direction of the valve body is formed such that at least one of the first and second valve seats is formed on an inner peripheral edge of the valve body formed integrally with the second end wall, the cylindrical core portion, and the housing main portion. An inward projecting portion projecting radially inward from the intermediate portion is integrally projected, and a notch-shaped recess is provided in the outer peripheral portion of the first end wall, and the inner surface of the first end wall is contacted. A projecting portion that is fitted in the concave portion so as not to be relatively movable in the circumferential direction is integrally provided at the one end of the bobbin that is in contact with the bobbin. a first step of the annular, the first caulking portion thin cylindrical which enables the caulking so as to sandwich the outer peripheral portion of the first end wall between a first step portion is provided integrally, the Between the outer periphery of the coil assembly and the first step portion and the caulking portion of the first end wall. A synthetic resin mold sealing body that integrally covers the outer surface excluding the curled portion, and the coupler is disposed on the opposite side of the coil assembly along the axial direction of the solenoid housing and on the side of the housing. The terminal member is integrally formed so as to protrude without protruding, and the terminal member extends along the axial direction of the solenoid housing and penetrates the protrusion closely and is built in the mold sealing body. The first portion and the second portion extending from the first portion toward the radially inner side of the housing and facing the inner space of the coupler are bent so as to be substantially perpendicular to each other.
[0007]
According to such a configuration of the first aspect of the invention, the valve body and the second end wall and the housing main portion which are constituent members on the valve body side of the solenoid housing are integrally formed. The connection strength of the valve body can be sufficiently increased as compared with that of the caulking connection. In addition, an inward projection that forms at least one of the first and second valve seats is formed integrally with the valve body, and a cylindrical core that surrounds the movable core is integrally connected to the second end wall. Compared with the case where at least one of the first and second valve seats and the cylindrical core portion are formed of separate members, the number of parts can be reduced and the number of assembling steps can be reduced. The coaxiality of the end wall, the cylindrical core portion, the housing main portion, and the inward protruding portion can be remarkably increased, and the magnetic efficiency can be improved. Further, the coupling portion of the housing main portion and the first end wall does not require a large coupling strength, but by providing the first step portion and the first caulking portion integrally at one end portion of the housing main portion, The first end wall can be easily connected and fixed to one end of the housing main portion by caulking.
[0008]
And the outer periphery of the or coils assembly, integrally with the outer surface except for the portion sandwiched between the first step portion and the first caulking portion of the first end wall of being in contact with the inner surface at one end of the bobbin A coupler that allows a terminal member connected to one end of the coil to face a synthetic resin mold sealing body that is continuously covered so as to protrude in the opposite direction to the coil assembly along the axial direction of the solenoid housing. since it formed and unitized first end wall of the coils assembly and the solenoid housing by caulking the outer periphery of the first end wall at one end of the cylindrical housing main part, the assembly of the solenoid housing The coil assembly can be accommodated in the solenoid housing and the mold sealing body can be attached to the solenoid housing at the same time, and the assembling workability can be improved. In addition, since the coupler is formed integrally with the mold sealing body, it is not necessary to prepare a separate coupler, so the number of parts can be reduced, and it is not necessary to assemble a separate coupler. Man-hours can be reduced. Moreover, the coupler is reinforced with the first end wall made of magnetic metal and the terminal member made of conductive metal, and the coupling strength of the coupler to the mold sealing body can be increased. Further, since the coupler projects along the axial direction of the solenoid housing on the side opposite to the coil assembly and does not protrude to the side of the housing, a portion for arranging the coupler is provided in the solenoid housing. The three-way solenoid valve can be prevented from being enlarged in the width direction by preventing the coupler from protruding to the side of the solenoid housing.
[0009]
According to a second aspect of the invention, in addition to the configuration of the first aspect of the invention, an engagement hole is provided in a central portion of the first end wall, and the engagement hole is provided integrally with the fixed core. The outer surface of the first end wall is such that the tip of the connecting pin that penetrates the hole sandwiches the grounding terminal member connected to the other end of the coil with the outer surface of the first end wall around the engagement hole. According to this configuration, the fixed core can be easily fixed to the first end wall, and the mold sealing body is unitized including the fixed core. A mold sealing body can be made into a stronger structure. In addition, a grounding terminal member can be electrically connected to the first end wall, that is, the solenoid housing, and the grounding terminal member is covered with the mold sealing body so that it can be exposed to the outside. Absent.
[0010]
According to a third aspect of the invention, in addition to the configuration of the first aspect of the invention, an annular second step portion facing outward in the axial direction is provided at the other end of the valve body. A valve seat member having a flange portion to be contacted is fitted and fixed to the other end portion of the valve body so as to form a valve chamber between the inward projecting portion and a first valve hole is formed on the inner periphery. A first valve seat is provided on an inner peripheral edge of the inwardly projecting protrusion, and a second valve hole disposed on the same axis as the first valve hole with an outer end opened on the valve seat member; A second valve seat that coaxially surrounds the inner ends of the two valve holes is provided, and one end is fixed to the movable core and is connected to the other end of the rod that passes through the first valve hole coaxially and movably. In addition, a guide tube portion for guiding a spherical valve body that can alternatively be seated on the first and second valve seats is integrally connected, and the valve body is A communication hole that allows the second valve hole to communicate with the valve chamber when separated from the two valve seats is provided in the guide cylinder so as to leave the tip of the guide cylinder in a ring shape. And
[0011]
According to the configuration of the invention described in claim 3 , the second valve seat and the second step portion of the valve body are in the axial direction of the valve body with the valve seat member fitted and fixed to the valve body. The position of the second valve seat corresponding to the diversification of the length and shape of the valve body can be set by simply changing the length between the second valve seat and the flange. And versatility can be improved. In addition, the valve seat member is integrally provided with a guide cylinder for guiding the spherical valve body, and the communication hole that allows the second valve hole to communicate with the valve chamber when the valve body is separated from the second valve seat. However, since the guide cylinder part is provided in the guide cylinder part so as to leave the tip of the guide cylinder part in a ring shape, it is possible to increase the strength of the guide cylinder part that guides the valve body and to prevent deformation. And the valve body can be accurately guided by the guide tube portion.
[0012]
According to a fourth aspect of the invention, in addition to the configuration of the third aspect of the invention, the communication hole is formed in a substantially right-angled quadrilateral shape in which two of the four sides are along the axis of the guide tube portion. According to such a configuration, the opening area of the communication hole when the valve body moves in the direction away from the second valve seat can be quickly increased as compared with a circular communication hole. More fluid can be circulated between the second valve hole and the valve chamber with a small movement amount of the valve body.
[0013]
Furthermore, in the invention according to claim 5 , in addition to the configuration of the invention according to claim 3 , the other end of the valve body is provided with a flange portion of the valve seat member between the second step portion, A thin-walled cylindrical second caulking portion that allows the fluid flowing into the valve hole to be filtered and caulked so as to overlap and sandwich the outer peripheral portion of the filter that contacts the outer end of the valve seat member is integrated. According to this configuration, the valve seat member and the filter integrally including the guide cylinder portion into which the valve body is inserted can be easily assembled to the valve body.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described based on examples of the present invention shown in the accompanying drawings.
[0015]
1 to 10 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 longitudinal sectional view showing an upper half portion of FIG. 1 is an enlarged longitudinal sectional view of the lower half of FIG. 1, FIG. 4 is a longitudinal sectional view of a housing main part, a second end wall and a valve body, and FIG. 5 is a view from a coil assembly, a first end wall and a fixed core. FIG. 6 is a sectional view taken along line 5-5 in FIG. 6, FIG. 6 is a view taken along arrow 6 in FIG. 5, and FIG. 7 is a state in which the preliminary assembly unit is covered with a mold sealing body. 8 is a longitudinal sectional view of the valve seat member, and is a sectional view taken along line 8-8 in FIG. 9, FIG. 9 is a sectional view taken along line 9-9 in FIG. 8, and FIG. FIG.
[0016]
In FIG. 1, this three-way solenoid valve 14 communicates an inlet passage 11 connected to a fluid supply source (not shown) with an outlet passage 12 connected to a fluid pressure actuator (not shown) and a reservoir (not shown). A valve portion 15 that operates so as to switch between a state in which the discharge passage 13 and the outlet passage 12 connected to each other are cut off, and a state in which the passage between the inlet passage 11 and the outlet passage 12 is cut off and the communication between the discharge passage 13 and the outlet passage 12 is switched; , And a solenoid portion 16 that exerts electromagnetic force for switching the valve portion 15.
[0017]
The solenoid unit 16 includes a coil assembly 17, a magnetic metal solenoid housing 18 that houses the coil assembly 17, a magnetic metal fixed core 19 that is magnetically coupled to the solenoid housing 18, and the fixed core. 19 and a movable core 20 facing the main body 19.
[0018]
2 and 3 together, the coil assembly 17 is formed by winding a coil 24 around a synthetic resin bobbin 23 having a center hole 22. The solenoid housing 18 includes a cylindrical housing main portion 25 that surrounds the coil assembly 17, a first end wall 26 that faces one end of the bobbin 23 and closes one end of the housing main portion 25, and the bobbin 23. The first end wall 26, which is a member different from the housing main portion 25, is configured as one end of the housing main portion 25. The second end wall 27 is formed integrally with the other end of the housing main portion 25, and a bracket 36 is fixed to the housing main portion 25.
[0019]
Referring also to FIG. 4, at one end of the housing main portion 25, an annular first step portion 25 a that receives the inner surface of the outer peripheral portion of the first end wall 26 formed in a disc shape, a first step portion 25 a, A thin cylindrical first caulking portion 25b that can be caulked so as to sandwich the outer peripheral portion of the first end wall 26 is integrally provided, and the inner surface of the outer peripheral portion is in contact with the first step portion 25a. The first end wall 26 is fixed to one end of the housing main portion 25 by caulking the first caulking portion 25 b so as to engage with the outer surface of the outer peripheral portion of the first end wall 26 that is made to move.
[0020]
Incidentally, the coil assembly 17, the fixed core 19, and the first end wall 26 are unitized as a preliminary assembly unit 28 as shown in FIGS.
[0021]
First and second recesses 29 and 30 located on one diameter line are provided on the outer peripheral portion of the first end wall 26, and the length of the first recess 29 along the circumferential direction of the first end wall 26 is provided. L1 is set larger than length L2 of the 2nd recessed part 30 along the said circumferential direction. In addition, a protrusion 23a fitted into the first recess 29 is integrally provided at one end of the bobbin 23 so as to contact both ends of the first recess 29 along the circumferential direction of the first end wall 26. The first terminal member 31 made of a conductive metal connected to one end of the coil 24 protrudes from the tip of the protrusion 23a through the protrusion 23a. A second terminal member 32 made of conductive metal for grounding is projected from one end of the bobbin 23 so as to be connected to the other end of the coil 24, and the second terminal member 32 penetrates the second recess 30. .
[0022]
The fixed core 19 inserted into one end side of the center hole 22 in the bobbin 23 is fixed to the center portion of the first end wall 26 by caulking engagement. That is, an engagement hole 33 is provided at the center of the first end wall 26, and a connection pin 34 that penetrates the engagement hole 33 is coaxially and integrally connected to one end of the fixed core 19. The distal end portion of the connecting pin 34 that penetrates the joint hole 33 is caulked and engaged with the outer surface side of the first end wall 26 around the engagement hole 33.
[0023]
Moreover, the second terminal member 32 for grounding is bent at a substantially right angle so as to overlap the outer surface of the first end wall 26, and is a portion protruding from one end of the bobbin 23 to facilitate bending. A neck portion 32 a having a narrow width is formed at an intermediate portion of the second terminal member 32. An engagement hole 35 corresponding to the engagement hole 33 of the first end wall 26 is provided at the tip of the second terminal member 32 that overlaps the outer surface of the first end wall 26, and the connecting pin 34 is engaged. The joint holes 33 and 35 are penetrated.
[0024]
Further, the distal end portion of the connecting pin 34 penetrating the engagement holes 33 and 35 is caulked so as to engage with the periphery of the second terminal member 32 around the engagement hole 35. That is, the distal end portion of the connecting pin 34 is caulked to the outer surface side of the first end wall 26 so that the second terminal member 32 is sandwiched between the outer peripheral surface of the first end wall 26 around the engagement holes 33 and 35. As a result, the coil assembly 17 is inserted into one end side of the center hole 22 in the bobbin 23 and the first end wall 26 in contact with one end of the bobbin 23 in the coil assembly 17. The fixed core 19 fixed to the first end wall 26 is unitized as the preliminary assembly unit 28.
[0025]
Such a pre-assembly unit 28 is covered with a synthetic resin mold sealing body 38 as shown in FIG. In the preliminary assembly unit 28, the mold sealing body 38 includes the outer periphery of the coil assembly 17 and the outer surface of the first end wall 26 excluding the portion sandwiched between the first step portion 25a and the first caulking portion 25b. A coupler 38 a that is formed so as to be integrally covered and faces the first terminal member 31 that is continuous with one end of the coil 24 protrudes to the opposite side of the coil assembly 17 along the axial direction of the solenoid housing 18. Thus, it is integrally formed with the mold sealing body 38. Moreover the first terminal member 31 includes a first portion built in the mold sealing body 38, a second facing the internal space of the coupler 38a extending from the first portion radially inward side of the housing 18 In order to facilitate bending, a neck portion 31a having a narrow width is formed in the middle portion of the first terminal member 31 at a portion protruding from one end of the bobbin 23. It is formed.
[0026]
The first end wall 26 is provided with a plurality of through holes 39, 39... And a part of the mold sealing body 38 bites into the through holes 39, 39. The one end wall 26 is firmly bonded.
[0027]
A through hole 40 coaxial with the center hole 22 is provided at the center of the second end wall 27 and surrounds a part of the movable core 20 inserted on the other end side of the center hole 22. A cylindrical core portion 41 inserted on the other end side of the center hole 22 is coaxially and integrally connected.
[0028]
A rod 42A that passes through the movable core 20 coaxially is fixed to the movable core 20 by caulking the end of the movable core 20 on the side opposite to the fixed core 19 and coupling to the rod 42A. A spring accommodating recess 43 is provided at the center of the surface of the fixed core 19 that faces the movable core 20, and a small-diameter shaft portion 42a that projects into the spring accommodating recess 43 is integrally provided at one end of the rod 42A. .
[0029]
The spring accommodating recess 43 accommodates a spring 44 that urges the movable core 20 toward the side away from the fixed core 19. In addition to the spring 44 whose one end is in contact with the closed end of the spring accommodating recess 43. In order to prevent the movable core 20 from being magnetically attracted to the fixed core 19, the end is connected to the magnet killer 45 made of a non-magnetic material that is in contact with the end surface of the movable core 20 on the fixed core 19 side. The small diameter shaft portion 42a of 42A is contacted while surrounding it.
[0030]
In addition, a plurality of passages 46 that connect the outer surfaces of the movable core 20 are provided in the axially intermediate portion of the movable core 20, and the portion corresponding to the passage 46 from the end surface of the movable core 20 on the fixed core 19 side is provided. Thus, flat surfaces 42b, which form passages 47 between the inner surfaces of the movable cores 20, are provided at a plurality of positions spaced in the circumferential direction of the outer surface of the rod 42A. The passages 46, 47,... Prevent the pressurization and decompression in the spring accommodating recess 43 when the movable core 20 is moved in the axial direction, and ensure the smooth movement of the movable core 20 in the axial direction. be able to.
[0031]
One end of a cylindrical valve body 48 that extends coaxially with the through hole 40 of the second end wall 27 and extends to the opposite side of the solenoid housing 18 is integrally connected to the second end wall 27 of the solenoid housing 18. A stepped cylindrical guide collar 49 that is partially inserted into the valve body 48 is press-fitted into the through hole 40. The guide guide collar 49 is made of a nonmagnetic material such as stainless steel, and a rod 42A protruding from the movable core 20 toward the valve body 48 is slidably fitted to the guide collar 49, whereby the rod 42A. The axial movement of the movable core 20 is guided by the guide collar 49.
[0032]
The valve portion 15 includes a valve body 48, a valve seat member 50 fitted and fixed to the valve body 48, a spherical valve body 51 accommodated in the valve body 48, a movable core 20 of the solenoid portion 16, and It is comprised with the said rod 42A which interlocks and connects between the valve bodies 51. FIG.
[0033]
An inward protruding portion 53 protrudes in an axially intermediate portion of the valve body 48 so as to protrude radially inward, and the valve seat member 50 is provided between the inward protruding portion 53 and the inward protruding portion 53. The valve chamber 54 is formed and fitted to the other end of the valve body 48 and fixed. In addition, the valve body 48 is provided with a plurality of outlet ports 66 that allow the valve chamber 54 to communicate with the outlet passage 12.
[0034]
The inwardly protruding portion 53 forms a first valve hole 55 on the inner periphery of the rod 42 </ b> A so that the small-diameter pressing shaft portion 42 c provided at the other end of the rod 42 </ b> A is coaxially penetrated. A tapered first valve seat 56 is provided on the side inner periphery. Thus, a release chamber 57 is formed in the valve body 48 between the guide collar 49 and the inward projection 53, and the valve body 48 has a plurality of discharge ports 67 that allow the release chamber 57 to communicate with the discharge passage 13. Provided.
[0035]
Referring to FIGS. 8 to 10 together, the valve seat member 50 is formed in a cylindrical shape having a diameter that can be fitted to the other end side of the valve body 48. A second valve hole 58 that opens at the outer end and is arranged coaxially with the first valve hole 55; and a second valve seat that faces the valve chamber 54 so as to coaxially surround the inner end of the second valve hole 58. 59, and the second valve seat 59 is formed in a tapered shape having a small diameter on the second valve hole 58 side.
[0036]
On the other hand, an annular second step portion 48a facing outward in the axial direction is provided at the other end portion of the valve body 48, and the end portion of the valve seat member 50 opposite to the valve chamber 54 is connected to the second step portion 48a. A flange portion 50a projecting radially outward so as to abut is integrally provided, and this flange portion 50a is press-fitted into the other end portion of the valve body 48 until it abuts against the second step portion 48a.
[0037]
A guide tube portion 60 for guiding the valve body 51 is coaxially and integrally connected to the end portion of the valve seat member 50 on the valve chamber 54 side so as to have a smaller diameter than the valve seat member 50. 60, for example, a pair of communication holes 61 for connecting the second valve hole 58 to the valve chamber 54 when the valve body 51 moves away from the second valve seat 59 and moves to the first valve seat 56 side. 61 are provided at positions spaced at equal intervals in the circumferential direction of the guide cylinder portion 60 so that the tip end portion of the guide cylinder portion 60 remains in a ring shape. It arrange | positions as close as possible to the seating seal part to the 2nd valve seat 59. FIG.
[0038]
The communication hole 61 is formed in a substantially right-angled quadrilateral shape in which two of the four sides are aligned with the axis of the guide tube portion 60, and preferably in a substantially rectangular shape having a short side in the direction along the axis of the guide tube portion 60. The
[0039]
The other end portion of the valve body 48 is fitted with a filter 62 so that the outer peripheral portion is brought into contact with the flange portion 50a in contact with the second step portion 48a from the outside. The filter 62 filters the fluid flowing into the second valve hole 58. The filter 62 is supported by a support ring 63, and the support ring 63 is brought into contact with the flange portion 50a. In addition, the flange 50a and the outer periphery of the filter 62 that contacts the flange 50a, that is, the support ring 63 may be sandwiched between the second step 48a and the other end of the valve body 48. A thin cylindrical second caulking portion 48b that can be caulked is integrally provided.
[0040]
Further, a tapered portion 58a having a large diameter on the filter 62 side is formed at the end of the second valve hole 58 on the filter 62 side.
[0041]
Next, the operation of the first embodiment will be described. In the three-way electromagnetic valve 14 composed of the valve portion 15 and the solenoid portion 16, the valve body 48 of the valve portion 15 and the valve body of the solenoid housing 18 of the solenoid portion 16 are described. Since the second end wall 27 and the housing main portion 25 which are constituent members on the 48 side are integrally formed, the connection strength between the solenoid housing 18 and the valve body 48 can be sufficiently increased as compared with that of the caulking connection. it can.
[0042]
A cylindrical core portion 41 surrounding the movable core 20 is integrally connected to the second end wall 27. The valve body 48 includes at least one of the first and second valve seats 56, 59, which is the first in this embodiment. Since the inward projection 53 that forms the valve seat 56 is integrally formed, the number of parts is smaller than that in which at least one of the first and second valve seats 56 and 59 and the cylindrical core portion 41 are formed of separate members. In addition to reducing the number of assembly steps, the coaxiality of the valve body 48, the second end wall 27, the cylindrical core portion 41, the housing main portion 25, and the inward protruding portion 53 is significantly increased. , Magnetic efficiency can be improved.
[0043]
Further, the coupling portion between the housing main portion 25 and the first end wall 26 does not require a large coupling strength, but the first step portion 25a and the first caulking portion 25b are integrally provided at one end portion of the housing main portion 25. Accordingly, the first end wall 26 can be easily connected and fixed to one end portion of the housing main portion 25 by caulking.
[0044]
By the way, the coil assembly 17 is sandwiched between the first step portion 25a and the first caulking portion 25b in the first end wall 26 in which the inner surface is in contact with one end of the bobbin 23 in the coil assembly 17. The outer surface excluding the portion is covered with a synthetic resin mold sealing body 38 that is integrally connected. Therefore, the coil assembly 17 and the first end wall 26 are unitized, and the outer peripheral portion of the first end wall 26 is caulked and coupled to one end of the housing main portion 25, so that the solenoid housing 18 can be assembled, and the solenoid of the coil assembly 17. Housing in the housing 18 and assembly of the mold sealing body 38 to the solenoid housing 18 can be performed simultaneously, and assembly workability can be improved.
[0045]
In addition, since the coupler 38a that faces the first terminal member 31 connected to one end of the coil 24 is integrally formed on the mold sealing body 38, it is not necessary to prepare another coupler, and the number of parts can be reduced. In addition, since it is not necessary to assemble a separate coupler, the number of assembling steps can be reduced. In addition, the coupler 38a is reinforced by the first end wall 26 made of magnetic metal and the first terminal member 31 made of conductive metal, so that the coupling strength of the coupler 38a to the mold sealing body 38 can be increased.
[0046]
Further, since the coupler 38a projects to the opposite side of the coil assembly 17 along the axial direction of the solenoid housing 18, it is not necessary to provide the solenoid housing 18 with a portion for installing the coupler 38a. It is possible to prevent the three-way solenoid valve 14 from increasing in size in the width direction so that the coupler 38a does not protrude from the side of the valve.
[0047]
By the way, the 1st and 2nd recessed parts 29 and 30 located on the outer peripheral part of the 1st end wall 26 are provided in the one diameter line, and the 1st recessed part 29 along the circumferential direction of the 1st end wall 26 is provided. The length L1 is set to be greater than the length L2 of the second recess 30 along the circumferential direction. In addition, a protrusion 23a fitted into the first recess 29 is integrally provided at one end of the bobbin 23 so as to contact both ends of the first recess 29 along the circumferential direction of the first end wall 26. The first terminal member 31 made of a conductive metal connected to one end of the coil 24 protrudes from the tip of the protrusion 23a through the protrusion 23a.
[0048]
Accordingly, the circumferential relative positions of the first end wall 26 and the coil assembly 17 are easily and uniformly determined so that the protrusion 23a is securely fitted to the first recess 29 of the first and second recesses 29 and 30. In addition, it is possible to extend the first terminal member 31 toward the coupler 38a while reliably maintaining insulation from the first end wall 26. Before the coupler assembly 17 is covered with the mold sealing body 38, the protrusion 23a protrudes from the bobbin 23. The first terminal member 31 made of conductive metal is formed in the protrusion 23a. Since it is built in, the strength of the protrusion 23a can be maintained.
[0049]
The fixed core 19 is fixed to the central portion of the first end wall 26, and the mold sealing body 38 is unitized including the fixed core 19, so that the mold sealing body 38 is made a stronger structure. can do.
[0050]
When fixing the fixed core 19 to the first end wall 26, an engagement hole 33 is provided in the center of the first end wall 26, and a connecting pin that is integrally connected to the fixed core 19 and passes through the engagement hole 33. The front end portion of 34 is caulked and engaged with the outer surface side of the first end wall 26, and the fixed core 19 can be easily fixed to the first end wall 26. In addition, the second terminal member 32 for earth connected to the other end of the coil 24 is sandwiched between the outer surface of the first end wall 26 around the engagement holes 33 and 35, and the tip end portion of the connecting pin 34 is the first end wall. 26, the second terminal member 32 for grounding can be electrically connected to the first end wall 26, that is, the solenoid housing 18. Further, since the second terminal member 32 for grounding is covered with the mold sealing body 38, it is not exposed to the outside.
[0051]
An annular second step portion 48a facing outward in the axial direction is provided at the other end portion of the valve body 48, one end of which is integrally connected to the second end wall 27 of the solenoid housing 18, and the second step portion 48a is provided with the second step portion 48a. A valve seat member 50 having a flange portion 50a that abuts is fitted and fixed to the other end portion of the valve body 48 so as to form a valve chamber 54 between the valve member 54 and the inwardly protruding portion 53. A first valve seat 56 is provided on the inner peripheral edge of the inwardly protruding portion 53 forming the valve hole 55 on the valve chamber 54 side, and the valve seat member 50 is arranged coaxially with the first valve hole 55 by opening the outer end. The second valve hole 58 and the second valve seat 59 that coaxially surrounds the inner end of the second valve hole 58 are provided, and one end is fixed to the movable core 20 to move the first valve hole 55 coaxially and move. The first and second valve seats 56, 5 are connected to the other end of the rod 42A penetrating through the first and second valve seats 56, 5. Alternatively, a guide tube portion 60 for guiding a spherical valve body 51 that can alternatively be seated is integrally provided, and when the valve body 51 is separated from the second valve seat 59, the second valve hole 58 is formed in the valve chamber. 54 is provided in the guide tube portion 60 so as to leave the tip of the guide tube portion 60 in a ring shape.
[0052]
Accordingly, the distal end of the guide tube portion 60 is continuous in a ring shape, and the strength of the guide tube portion 60 that guides the valve body 51 can be increased and deformation can be prevented. Can be accurately guided.
[0053]
The communication holes 61 are arranged as close as possible to the seating seal portion of the valve body 51 with respect to the second valve seat 59, so that the valve body 51 moves in a direction away from the second valve seat 59. The fluid can quickly flow through the communication holes 61 in response to the start, and more fluid flows between the second valve hole 58 and the valve chamber 54 with a small movement amount of the valve body 51 of the valve body 51. Can be made.
[0054]
Further, since the first and second valve seats 56 and 59 are formed in a tapered shape with a small diameter on the first and second valve holes 55 and 58 side, the seating property of the spherical valve body 51 is good and stable. A closed state can be obtained.
[0055]
In addition, the communication hole 61 is formed in a substantially right-angled quadrilateral shape in which two of the four sides are aligned with the axis of the guide tube portion 60, and the valve body 51 is second in comparison with a circular communication hole 61. The opening area of the communication hole 61 when moving away from the valve seat 59 can be quickly increased, and a larger amount of fluid can be transferred between the second valve hole 58 and the valve chamber 54 with a small movement amount of the valve body 51. It can be distributed. In addition, in the first embodiment, the communication hole 61 is formed in a substantially rectangular shape having a short side in the direction along the axis of the guide tube portion 60, so that the amount of fluid flow with respect to the amount of movement of the valve body 51 is increased. It is possible to contribute to shortening the axial length of the guide tube 60.
[0056]
Further, the guide tube portion 61 is formed to have a smaller diameter than the valve seat member 50, and between the inner periphery of the valve body 48 and the outer periphery of the guide tube portion 60 when the valve seat member 50 is fitted and fixed to the valve body 48. An annular gap can be formed in the valve body 48, and an outlet port 66 is provided in the valve body 48 so as to communicate with the gap, so that the valve position to the valve body 48 can be reduced without determining the circumferential position of the communication hole 61. By fitting and fixing the seat member 50, the communication hole 61 communicates with the outlet port 66, and the assembly of the valve seat member 50 to the valve body 48 is facilitated.
[0057]
Further, the diameter of the valve seat member 50 is set so that it can be fitted into the valve body 48, and the flange portion 50a is press-fitted into the other end of the valve body 48, so that one end side of the valve seat member 50 is connected to the valve body 48. The flange portion 50a can be press-fitted into the other end of the valve body 48 so as to be stably guided by fitting into the valve body, and the workability of assembling the valve seat member 50 to the valve body 48 is improved. Can do. Moreover, since the flange portion 50a is press-fitted, it is possible to seal between the valve seat member 50 and the valve body 48, eliminating the need for the seal member and reducing the number of parts.
[0058]
Further, at the other end of the valve body 48, the flange 50a of the valve seat member 50 and the fluid flowing into the second valve hole 58 are filtered between the second step 48a and the flange 50a. Since the thin-walled cylindrical second caulking portion 48b that can be caulked so as to overlap the outer peripheral portion of the abutting filter 62 is integrally provided, the guide tube portion 60 into which the valve body 51 is inserted is integrated. Thus, the valve seat member 50 and the filter 62 can be easily assembled to the valve body 48.
[0059]
In addition, since the tapered portion 58a having a large diameter on the filter 62 side is formed at the end of the second valve hole 58 on the filter 62 side, the filtration area of the filter 62 can be set large, The loss resistance of the fluid flowing through the two valve holes 58 can be kept small.
[0060]
FIG. 11 shows a second embodiment of the present invention, and parts corresponding to the first embodiment are given the same reference numerals.
[0061]
A small diameter shaft portion 42 a ′ that penetrates the spring accommodating recess 43 of the fixed core 19 is integrally and coaxially provided at one end of the rod 42 </ b> B that penetrates the movable core 20 and is fixed to the movable core 20. The distance L3 between the movable core 20 and the fixed core 19 in the state of being farthest from the fixed core 19 is larger than the distance L4 between the tip of the small diameter shaft portion 24a ′ and the closed end of the spring accommodating recess 43 (L4 < L3) is set.
[0062]
According to the second embodiment, even if the movable core 20 is attracted to the fixed core 19 side, the movable core 20 does not come into contact with the fixed core 19, and therefore the magnet killer 45 required in the first embodiment is used. Can be made unnecessary.
[0063]
FIG. 12 shows a third embodiment of the present invention, and parts corresponding to the first embodiment are given the same reference numerals.
[0064]
On the outer periphery of the rod 42 </ b> C that passes through the movable core 20 and is fixed to the movable core 20, an annular groove 65 that is annularly connected is provided at a position corresponding to the passage 46 provided in the movable core 20.
[0065]
According to the third embodiment, no matter how the circumferential relative position of the rod 42C with respect to the movable core 20 changes, the passage 46 leads to the passage 47 through the annular groove 65. Positioning of the rod 42C in the circumferential direction when fixing 42C to the movable core 20 is facilitated.
[0066]
Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the present invention described in the claims. It is.
[0067]
【The invention's effect】
As described above, according to the first aspect of the present invention, the connection strength between the solenoid housing and the valve body can be sufficiently increased as compared with that of the caulking connection, the number of parts can be reduced and the number of assembling steps can be reduced. In addition, the coaxiality of the valve body, the second end wall, the cylindrical core portion, the housing main portion and the inward protruding portion can be remarkably increased, and the magnetic efficiency can be improved. The first end wall can be easily connected and fixed to the part by caulking.
[0068]
In addition, the assembly of the solenoid housing , the housing of the coil assembly in the solenoid housing, and the assembly of the mold sealing body to the solenoid housing can be performed simultaneously, and the assembly workability can be improved. In addition, since the coupler is formed integrally with the mold sealing body, the number of parts and assembly man-hours can be reduced, and the coupling strength of the coupler to the mold sealing body can be increased. It is possible to avoid the electromagnetic valve from becoming large in the width direction.
[0069]
According to the second aspect of the present invention, the fixed core can be easily fixed to the first end wall, and the mold sealing body can be made a stronger structure. In addition, the terminal member for grounding can be electrically connected to the solenoid housing, and the terminal member for grounding is not exposed to the outside.
[0070]
According to the third aspect of the present invention, it is possible to set the position of the second valve seat corresponding to diversification of the length and shape of the valve body only by changing the length between the second valve seat and the flange portion. Therefore, versatility can be improved. Moreover, it is possible to increase the strength of the guide tube portion that guides the valve body and prevent deformation, and the valve body can be guided with high accuracy by the guide tube portion.
[0071]
According to invention of Claim 4 , more fluid can be distribute | circulated between a 2nd valve hole and a valve chamber by the movement amount with little valve body.
[0072]
Furthermore, according to the fifth aspect of the present invention, the valve seat member and the filter integrally including the guide cylinder portion into which the valve body is inserted can be easily assembled to the valve body.
[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 vertical sectional view showing an upper half part of FIG.
3 is an enlarged longitudinal sectional view showing a lower half portion of FIG. 1. FIG.
FIG. 4 is a longitudinal sectional view of a housing main portion, a second end wall, and a valve body.
5 is a longitudinal sectional view of a preliminary assembly unit including a coil assembly, a first end wall, and a fixed core, and is a sectional view taken along line 5-5 of FIG.
6 is a view taken in the direction of arrow 6 in FIG. 5;
FIG. 7 is a longitudinal sectional view of a state in which a pre-assembly unit is covered with a mold sealing body.
8 is a longitudinal sectional view of the valve seat member, and is a sectional view taken along line 8-8 in FIG.
9 is a cross-sectional view taken along line 9-9 of FIG.
FIG. 10 is a view taken in the direction of arrow 10 in FIG. 9;
FIG. 11 is a longitudinal sectional view of a three-way solenoid valve according to a second embodiment.
FIG. 12 is a longitudinal sectional view of a three-way solenoid valve according to a third embodiment.
[Explanation of symbols]
14 ... three-way solenoid valve 17 ... coil assembly 18 ... solenoid housing 19 ... fixed core 20 ... movable core 22 ... center hole 23 ... bobbin
23a ... Projection 24 ... Coil 25 ... Housing main part 25a ... First step 25b ... First caulking part 26 ... First end wall 27 ... Second end wall
29 ... Recess 31 ... Terminal member
32 ... Grounding terminal member 33 ... Engagement hole 34 ... Connection pin 38 ... Mold sealing body 38a ... Coupler 40 ... Through hole 41 ... Cylindrical core portions 42A, 42B 42C ... Rod 48 ... Valve body 48a ... Second step portion 48b ... Second caulking portion 50 ... Valve seat member 50a ... Flange portion 51 ... Valve body 53 ... -Inward projection 54 ... Valve chamber 55 ... First valve hole 56 ... First valve seat 58 ... Second valve hole 59 ... Second valve seat 60 ... Guide tube 61 ... Communication hole 62 ... Filter

Claims (5)

A cylindrical housing main part (25) surrounding a coil assembly (17) formed by winding a coil (24) on a synthetic resin bobbin (23) having a center hole (22), and the bobbin (23 ) Facing one end of the housing main portion (25) and closing one end of the housing main portion (25), and the other end of the bobbin (23) opposite the other end of the housing main portion (25). A magnetic metal solenoid housing (18) is constituted by the second end wall (27) which is closed and provided with a central through hole (40) coaxial with the center hole (22), and the first end wall ( 26) a fixed core (19) magnetically coupled to the central hole (22) is inserted into one end side of the central hole (22), and the other end side of the central hole (22) is movable facing the fixed core (19). Part of the movable core (20) while the core (20) is inserted A cylindrical core body (41) is inserted into the second end wall (27) and coaxially connected to the second end wall (27), and one end of a cylindrical valve body (48) extending on the opposite side to the solenoid housing (18) is the second. A valve element (51), which is coaxially connected to the end wall (27) and seated on the first and second valve seats (56, 59) disposed in the valve body (48), includes the movable core ( 20), a coupler (38a) is connected to the solenoid housing (18) so as to face the terminal member (31) connected to one end of the coil (24), and the terminal member (31) is electrically conductive metal. embedded in one end of the base end is formed from a plate bobbin (23), a three-way solenoid valve that will be fixed,
The valve body (48) formed integrally with the second end wall (27), the cylindrical core portion (41) and the housing main portion (25) has at least the first and second valve seats (56, 59). An inward projecting portion (53) projecting radially inward from an intermediate portion in the axial direction of the valve body (48) so that one is formed on the inner periphery is integrally projected.
The outer peripheral portion of the first end wall (26) is provided with a notch-shaped recess (29), and the one end of the bobbin (23) contacting the inner surface of the first end wall (26) A protrusion (23a) fitted in the recess (29) so as not to move in the circumferential direction is integrally projected.
At one end of the main housing portion (25), first between the first step portion of the annular receiving the outer peripheral portion of the first end wall (26) (25a), and a first step portion (25a) A thin cylindrical first caulking portion (25b) that can be caulked so as to sandwich the outer peripheral portion of the end wall (26) is integrally provided ,
The outer periphery of the coil assembly (17) and the outer surface of the first end wall (26) excluding the portion sandwiched between the first step portion (25a) and the caulking portion (25b) are integrally covered. The coupler (38a) is disposed on the opposite side of the coil assembly (17) along the axial direction of the solenoid housing (18) and on the side of the housing (18) on the resin mold sealing body (38). It is formed integrally so that it protrudes without protruding to the direction,
The terminal member (31) extends along the axial direction of the solenoid housing (18) and penetrates the protrusion (23a) closely and is built in the mold sealing body (38). And a second portion extending from the first portion toward the radially inner side of the housing (18) and facing the internal space of the coupler (38a), and is bent so as to be substantially perpendicular to each other. Three-way solenoid valve . An engagement hole (33) is provided at the center of the first end wall (26), and is connected to the fixed core (19) so as to be integrated with the connection pin (34) passing through the engagement hole (33). The end portion of the coil is sandwiched between the ground terminal member (32) connected to the other end of the coil (24) and the outer surface of the first end wall (26) around the engagement hole (33), The three-way solenoid valve according to claim 1 , wherein the three-way solenoid valve is caulked and engaged with the outer surface side of the first end wall (26).   The valve body (48) is provided with an annular second step portion (48a) facing outward in the axial direction at the other end of the valve body (48), and has a flange portion (50a) in contact with the second step portion (48a). (50) is fitted and fixed to the other end of the valve body (48) so as to form a valve chamber (54) between the inwardly protruding portion (53) and the first valve on the inner periphery. A first valve seat (56) is provided on the inner periphery of the inwardly protruding portion (53) forming the hole (55) on the valve chamber (54) side, and the valve seat member (50) has an outer end opened. A second valve hole (58) disposed coaxially with the first valve hole (55) and a second valve seat (59) coaxially surrounding the inner end of the second valve hole (58), Rods (42A, 42B, 42C) having one end fixed to the movable core (20) and coaxially and movably penetrating the first valve hole (55) A guide tube portion (60) that guides a spherical valve body (51) that is connected to the other end and that can alternatively be seated on the first and second valve seats (56, 59) is integrally provided, A communication hole (61) that allows the second valve hole (58) to communicate with the valve chamber (54) when the valve body (51) is separated from the second valve seat (59) has the guide tube portion ( The three-way solenoid valve according to claim 1, wherein the guide tube portion (60) is provided so as to leave the tip end portion of 60) in a ring shape. The three-way solenoid valve according to claim 3, wherein the communication hole (61) is formed in a substantially right-angled quadrilateral shape with two of the four sides along the axis of the guide tube portion (60). The fluid that flows into the flange portion (50a) of the valve seat member (50) and the second valve hole (58) between the other end of the valve body (48) and the second step portion (48a). A thin cylindrical second caulking portion (48b) that can be caulked so as to overlap the outer peripheral portion of the filter (62) contacting the outer end of the valve seat member (50). The three-way solenoid valve according to claim 3 , wherein is provided integrally.

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