JP2015031318A - Solenoid valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a size and a weight of a solenoid valve and to easily assemble the solenoid valve.SOLUTION: A solenoid portion 14 for allowing a ball 50 as a valving element to sit on and separate from a first valve seat 44/a second valve seat 52, has a first core member 66 to be displaced in a housing 16, and a second core member 88 positioned inside of the housing 16. A core portion 102 of the second core member 88 is inserted into a through hole 98 of a bobbin 82 to be separated from a ceiling surface of the housing 16. Thus a space between the ceiling surface of the housing 16 and the core portion 102 becomes hollow. The second core member 88 is inserted from an opening of the housing 16.

Description

  The present invention relates to a solenoid valve that opens and closes when energization or de-energization is performed on an electromagnetic coil constituting a solenoid unit.

  As is well known, the solenoid valve has a solenoid portion including an electromagnetic coil, and opens and closes when the electromagnetic coil is energized and de-energized. As this type of solenoid valve, the one described in Patent Document 1 is exemplified.

  As shown in FIG. 1 of Patent Document 1, the solenoid portion is formed integrally with the housing so as to be housed in the housing and displaceable within the housing, and to protrude from the housing. And a fixed core. When the electromagnetic coil is energized, a magnetic force acts on the movable core via the fixed core. As a result, for example, the movable core is displaced upward. Thereby, a valve body leaves | separates from a valve seat and a solenoid valve will be in an open state.

  On the other hand, when energization is stopped, the magnetic force acting on the movable core disappears. Therefore, the movable core is elastically biased from the return spring and returns to the original position. Following this, the valve body is seated on the valve seat, and the solenoid valve is closed.

JP 2009-85322 A

  The housing integral with the fixed core is generally manufactured by forging. In this case, as a material for obtaining the housing, a material having sufficient rigidity so as not to crack when plastic deformation by forging is employed, but such a material is generally thick. For this reason, it is not easy to reduce the size and weight of the solenoid valve. Moreover, since thick materials are expensive and forging devices are also expensive, it is not easy to reduce the production cost of the solenoid valve.

  Further, since the housing and the fixed core are integrally formed, the fixed core is a solid body having a substantially cylindrical shape. This is also one of the reasons why it is difficult to reduce the weight of the solenoid valve.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a solenoid valve that can reduce the manufacturing cost and can be reduced in size and weight.

In order to achieve the above object, a solenoid valve according to the present invention includes a valve body having an inlet port and an outlet port through which pressure fluid flows, and
A valve body that places the inlet port and the outlet port in a communication state or a communication cut-off state by being seated on or separated from a valve seat provided inside the valve body;
A housing engaged with the valve body and containing a solenoid part therein;
With
The solenoid unit includes a bobbin coil in which an electromagnetic coil is wound around a bobbin, a first core member that is displaced in the housing in order to seat or separate the valve body from the valve seat, and an interior of the housing A second core member positioned at
The second core member includes an interposition part interposed between the end surface of the bobbin and the end surface of the housing, and a core part protruding from the interposition part and inserted into the through-hole of the bobbin together with the first core member And
The core portion of the second core member is separated from the end surface of the housing.

  In this configuration, a hollow portion is formed between the core portion of the second core member and the end surface of the housing. Accordingly, the weight can be reduced.

  Moreover, since it is not necessary to provide the fixed core part integral with the housing, the shapes of the housing and the second core member are simplified. Therefore, the housing and the second core member can be individually manufactured from a thin material by press working, for example. That is, it is possible to select a press working apparatus with a low capital investment compared to the forging apparatus, and it is possible to obtain a thin housing and the second core member. For the above reasons, the cost can be reduced and the solenoid valve can be reduced in size and weight.

  Here, it is preferable that the interposition part of the second core member only abuts on an end surface of the housing so that the second core member can be detached from the housing when the bobbin coil is detached from the housing. In other words, there is no particular need to connect the second core member to the housing or press fit into the housing. Accordingly, the assembly work of the solenoid valve becomes simple and easy, and the assembly efficiency is improved.

  Moreover, when the said valve main body has a flange part, it is preferable to interpose a 1st seal member between this flange part and the said bobbin, and to interpose a 2nd seal member between the said bobbin and the said housing. . In this case, each of the first seal member or the second seal member is crushed to give a resilient force to the bobbin or the second core member. Based on this elastic force, the second core member can be easily held.

  According to the present invention, the second core member and the housing are individually manufactured as separate members. Since the individual shapes of the second core member and the housing are simple, it is possible to produce each by, for example, pressing using a thin material. For this reason, it is possible to reduce the cost for obtaining the solenoid valve and to reduce the size and weight of the solenoid valve.

  Moreover, the core portion of the second core member is separated from the end surface of the housing. For this reason, a hollow part is formed between the core part and the end surface of the housing. This further reduces the weight of the solenoid valve.

It is a general | schematic whole longitudinal cross-sectional view when the solenoid valve which concerns on embodiment of this invention exists in a closed state. It is the principal part expanded sectional view which expanded and showed the 1st sheet | seat body, the 2nd sheet | seat body, valve body (ball | bowl), etc. which comprise the said solenoid valve. It is a disassembled perspective view of the housing and 2nd core member which comprise the said solenoid valve. It is a general | schematic whole longitudinal cross-sectional view when the said solenoid valve exists in an open state.

  Preferred embodiments of the solenoid valve according to the present invention will be described below in detail with reference to the accompanying drawings.

  FIG. 1 is a schematic overall longitudinal sectional view of the solenoid valve 10 according to this embodiment before energization (when energization is stopped). The solenoid valve 10 includes a valve main body 12 and a housing 16 that is engaged with the valve main body 12 and accommodates a solenoid portion 14. In the following description, “lower” and “upper” in the description with reference to FIG. 1 mean the lower and upper sides in FIG. The same applies to FIGS. 2 and 4.

  The valve body 12 is a hollow body having a substantially cylindrical shape by the inner hole 18 being formed therethrough, and an insertion port 20 is formed at the lower end thereof. Further, an outlet port 22 through which the pressure fluid is led out and a discharge port 24 communicating with the inner hole 18 are formed in the outer peripheral wall portion.

  Further, an annular groove 26 is formed above the discharge port 24 in the outer peripheral wall portion. An annular seal member 28 is attached to the annular groove 26. In the vicinity of the upper end portion of the valve main body 12, a flange portion 30 that protrudes annularly outward in the diameter direction is provided. An annular protrusion 32 projects from the flange portion 30 along the axial direction of the valve body 12.

  In this case, in addition to the outlet port 22, the discharge port 24, and the annular groove 26, a recessed groove or a recess is not formed on the outer peripheral wall portion of the valve body 12 from the lower end portion to the flange portion 30. Further, there is no portion that protrudes outward in the diameter direction. The same applies to the inner peripheral wall. For this reason, the cross section along the axial direction of the valve body 12 has a substantially linear shape from the lower end to the flange 30 as shown in FIG.

  A first sheet body 34 is press-fitted into the insertion port 20. The lower end portion of the first sheet body 34 slightly protrudes from the insertion port 20.

  As shown in FIG. 2 in an enlarged manner, the first sheet body 34 has an inlet port 36 into which pressure fluid is introduced, a press-in hole 38, a valve hole 40, a throttle hole 41, and a drain hole 42 along the longitudinal direction thereof. Are formed in this order from the lower end side. A second seat body 46 having a substantially cylindrical shape and having a first valve seat 44 at the upper end is press-fitted into the press-fitting hole 38 therein. Of course, the second sheet body 46 is formed with an inflow hole 48 communicating with the inlet port 36. Therefore, when the solenoid valve 10 is opened, the inlet port 36 communicates with the valve hole 40 via the inflow hole 48.

  A ball 50 as a valve body is accommodated in the valve hole 40. The valve hole 40 is continuous with a lateral hole 51 formed so as to penetrate from the valve hole 40 toward the outer peripheral wall side of the first sheet body 34. For this reason, the valve hole 40 communicates with the outlet port 22 via the lateral hole 51.

  The inner wall on the way from the valve hole 40 to the drain hole 42 is squeezed so as to have a small diameter by the throttle hole 41, whereby the second valve seat 52 is provided at the upper end portion of the first seat body 34. . As will be described later, the ball 50 is seated on either the first valve seat 44 or the second valve seat 52.

  The drain hole 42 expands in a tapered shape from the second valve seat 52 toward the inner hole 18. By this drain hole 42, the inner hole 18 communicates with the valve hole 40.

  A valve rod 54 is accommodated in the inner hole 18 (see FIG. 1). The valve stem 54 includes a contact portion 56 having the smallest diameter, a longest portion 58 having the largest diameter, a throttle portion 60 having a slightly smaller diameter than the long portion 58, a tapered portion 62 having a diameter reduced to a tapered shape, The entrance portion 64 has a small diameter and is longer than the throttle portion 60.

  The lower end of the abutment portion 56 enters the valve hole 40 through the drain hole 42 and the throttle hole 41, and the front end surface abuts on the ball 50. As will be described later, when the valve rod 54 applies a pressing force to the ball 50, the ball 50 is displaced from the second valve seat 52 toward the first valve seat 44.

  The valve stem 54 is held by a first core member 66 that constitutes the solenoid unit 14. That is, the first core member 66 is formed with a holding hole 68 having a medium inner diameter, an insertion hole 70 having the smallest diameter, and a spring hole 72 having the largest diameter in this order from the lower end side. In 68, the upper end of the long portion 58 of the valve stem 54 is press-fitted. With this press-fitting, the valve stem 54 is held by the first core member 66. Therefore, the valve stem 54 is displaced following the displacement of the first core member 66.

  Here, the inner diameter of the holding hole 68 is substantially equal to the diameter of the long portion 58. For this reason, a slight clearance is formed between the narrowed portion 60 and the tapered portion 62 and the inner wall of the holding hole 68. Similarly, a slight clearance is formed between the entry portion 64 and the inner wall of the insertion hole 70. Further, the entry portion 64 that has passed through the insertion hole 70 and entered the spring hole 72 is far away from the inner wall of the spring hole 72.

  A return spring 74 is accommodated in the spring hole 72, and one end of the return spring 74 is seated on the bottom wall of the spring hole 72. The first core member 66 is housed in a guide collar 76 that is partially inserted into the inner hole 18. A bulging portion 78 bulging downward is formed on the ceiling wall of the guide collar 76 so as to form a substantially truncated cone shape. The bulging portion 78 is formed at the other end of the return spring 74. It is passed inside. Accordingly, the return spring 74 is held by the guide collar 76 and elastically biases the first core member 66 toward the ball 50 side. Note that the entry portion 64 of the valve stem 54 enters the return spring 74.

  Near the upper end of the first core member 66, a breathing hole 80 extending in a direction orthogonal to the extending direction of the spring hole 72 is formed. The spring hole 72 communicates with the inner hole 18 through the breathing hole 80.

  Here, the solenoid unit 14 will be described. In addition to the first core member 66, the solenoid unit 14 includes a bobbin coil 86 in which an electromagnetic coil 84 is wound around a bobbin 82, and a second core member 88 sandwiched between the bobbin 82 and the housing 16. The bobbin 82 is provided with a resin-made coil mold body 92 integrally molded together with the coupler portion 90, and in this state, is disposed above the flange portion 30 of the valve body 12. An O-ring 94 (first seal member) is interposed between the flange portion 30 and the bobbin 82.

  When the O-ring 94 is pressed from the bobbin 82, the O-ring 94 is crushed so as to have a substantially triangular cross section. Each of the two surfaces corresponding to the short sides of the triangle formed by crushing faces the lower end surface of the flange portion 30 and the side wall of the annular projection 32. On the other hand, the inclined surface corresponding to the long side (bottom side) faces the bobbin 82.

  On the other hand, a taper hole 96 is formed in the lower end portion of the bobbin 82. The inner wall of the bobbin 82 has a tapered diameter as it goes upward. That is, the inner wall of the tapered hole 96 is an inclined surface.

  The taper angle of the inner wall of the taper hole 96 corresponds to the inclination angle of the inclined surface formed in the O-ring 94 by crushing. That is, the O-ring 94 is formed with an inclined surface that abuts against the inner wall of the tapered hole 96 by being pressed from the bobbin 82 and the valve body 12. The O-ring 94 seals between the valve body 12 and the bobbin coil 86 by this contact.

  Further, a through hole 98 is formed in the bobbin 82 along its longitudinal direction, and the axis of the through hole 98 coincides with the axis of the inner hole 18. That is, the through hole 98 continues to the inner hole 18.

  A portion protruding from the inner hole 18 of the guide collar 76 is inserted below the through hole 98. A part of the second core member 88 is inserted above the through hole 98.

  That is, the second core member 88 includes an annular interposition part 100 and a core part 102 formed so as to protrude from the interposition part 100 into a cylindrical shape. The intervening portion 100 is sandwiched between the upper end surface of the bobbin 82 and the inner surface (ceiling surface) of the ceiling wall of the housing 16.

  On the other hand, the core portion 102 is inserted into the through hole 98 of the bobbin 82. For this reason, the core part 102 is separated from the ceiling surface of the housing 16, and therefore, the space between the core part 102 and the housing 16 is a hollow part.

  The second core member 88 is merely inserted into the housing 16 and is not connected to the housing 16 or the bobbin 82. That is, the second core member 88 is in an unconstrained state. Therefore, for example, when the valve body 12 is detached from the housing 16 and the bobbin coil 86 is taken out from the housing 16 and the opening of the housing 16 is directed downward, the second core member 88 can be easily removed from the housing 16 only by the action of gravity. Can be taken out.

  An annular housing groove 104 is recessed in the upper end surface of the bobbin 82, and an O-ring 106 (second seal member) is housed in the housing groove 104. Accordingly, the O-ring 106 is interposed between the bobbin 82 and the housing 16.

  An annular step 108 extending along the circumferential direction of the inner wall is formed on the inner wall near the opening of the housing 16. When the flange portion 30 of the valve body 12 is press-fitted into the annular step portion 108, the housing 16 and the valve body 12 are engaged with each other.

  The coupler 90 of the coil mold body 92 protrudes from the notch 110 formed in the vicinity of the opening of the housing 16. Inside the coupler section 90, a terminal 112 made of a conductive material is provided. A current is supplied to the terminal 112 from an electric supply source (not shown).

  The solenoid valve 10 is attached to a predetermined member (for example, the body of the hydraulic control device) via an attachment stay 114 joined (for example, welded) to the housing 16.

  The solenoid valve 10 according to the present embodiment is basically configured as described above. Next, the function and effect will be described.

  In the solenoid valve according to the prior art, it is necessary to form a housing in which a fixed core is integrally connected to the ceiling surface by forging. Moreover, it is necessary to perform a cutting process for forming the predetermined protrusion length on the fixed core and a boring process for forming an accommodation hole for inserting a part of the return spring 74. That is, many steps are required to obtain the housing, which is expensive and complicated.

  On the other hand, in the solenoid valve 10 according to the present embodiment, the housing 16 and the second core member 88 are separate members, and each has a simple shape. Therefore, the housing 16 and the second core member 88 can be individually obtained by pressing (for example, deep drawing pressing). That is, since a press working apparatus can be selected with a lower capital investment than the forging apparatus, the cost can be reduced.

  Moreover, according to the press working, a molded product can be obtained from a relatively thin material. For this reason, since the housing 16 and the 2nd core member 88 can be obtained as a thin thing, the size and weight reduction of the solenoid valve 10 can be achieved.

  In addition, there is no need to perform cutting or drilling on the core portion 102. For this reason, the number of steps to obtain the housing 16 and the second core member 88 is reduced. This also reduces the cost.

  After obtaining the housing 16 and the second core member 88 as described above, the second core member 88 is inserted into the housing 16. Specifically, as shown in FIG. 3, the ceiling wall of the housing 16 is directed downward, and the second core member 88 enters from the opening. The outer diameter of the interposition part 100 of the second core member 88 substantially corresponds to the inner diameter of the housing 16 and is slightly smaller. For this reason, the second core member 88 is easily moved toward the inner surface of the ceiling wall of the housing 16 without being inclined with respect to the axial direction of the housing 16.

  As the interposition part 100 abuts against the ceiling surface, the second core member 88 is positioned inside the housing 16. This is because the outer diameter of the interposition part 100 of the second core member 88 substantially corresponds to the inner diameter of the housing 16 as described above, so there is no room for the second core member 88 to move within the housing 16.

  Thus, in the present embodiment, the second core member 88 is neither press-fitted into the housing 16 nor connected (restrained). Therefore, the assembling work is simplified and the working time is shortened accordingly. As a result, the solenoid valve 10 can be assembled efficiently.

  When the second core member 88 is inserted into the housing 16, only the upper end surface (the lower end surface in FIG. 3) of the interposition part 100 abuts on the ceiling surface of the housing 16, and the core part 102 is separated from the ceiling surface of the housing 16. Separate. Accordingly, a hollow portion surrounded by the ceiling surface of the housing 16 and the core portion 102 is formed. For this reason, a weight becomes small compared with the housing in which the fixed core was provided integrally. This also contributes to weight reduction of the solenoid valve 10.

  Next, the bobbin coil 86 in which the coil mold body 92 is sheathed is inserted into the housing 16. At this time, the core portion 102 of the second core member 88 enters the through hole 98 of the bobbin 82. With this approach, the bobbin coil 86 is guided to the core portion 102. That is, the bobbin coil 86 is prevented from being displaced in the housing 16 and smoothly reaches a predetermined position. At this time, the O-ring 106 contacts the interposition part 100 of the second core member 88.

  Thereafter, the guide collar 76 is inserted into the through hole 98 of the bobbin 82.

  On the other hand, the valve stem 54 is inserted into the holding hole 68 of the first core member 66 from the entry portion 64 side. Since the inner diameter of the insertion hole 70 is larger than that of the entry part 64 and the inner diameter of the holding hole 68 is larger than that of the taper part 62 and the throttle part 60, the inner wall and the entry part of the insertion hole 70 are formed. A clearance is formed between the inner wall 64 and the inner wall of the holding hole 68 and the tapered portion 62 and the throttle portion 60 (see FIG. 1).

  When the valve stem 54 is inclined or the like, it is easy to correct the posture of the valve stem 54 because there is a clearance. That is, the axis lines of the valve stem 54 and the first core member 66 can be easily matched with each other, so that the valve stem 54 is prevented from being inclined. Finally, the valve stem 54 is held by the first core member 66 as the elongated portion 58 of the valve stem 54 is press-fitted into the holding hole 68.

  At this time, the return spring 74 may be inserted into the spring hole 72 of the first core member 66. Alternatively, the return spring 74 may be inserted into the spring hole 72 before the valve rod 54 is press-fitted into the holding hole 68 of the first core member 66.

  Moreover, the valve main body 12 is produced by forging, for example. Thereafter, a drilling process for forming the outlet port 22 and the discharge port 24 is performed, and further, a cutting process for forming the annular groove 26 is performed.

  There is no need to process the valve body 12 to provide a step other than this. Accordingly, the number of processing steps is reduced. For this reason, the cost for obtaining the solenoid valve 10 is further reduced.

  Apart from the above, the second sheet body 46 is press-fitted into the inlet port 36 of the first sheet body 34 with the ball 50 inserted into the valve hole 40. Further, the first sheet body 34 into which the second sheet body 46 is press-fitted is press-fitted into the insertion port 20 of the valve body 12.

  Here, the 1st valve seat 44 is previously provided in the upper end part of the 2nd sheet | seat body 46 which makes a substantially cylindrical body shape. That is, in this case, it is not necessary to provide the first valve seat 44 inside the second seat body 46. Therefore, it is not necessary to insert a processing tool into the second sheet body 46. Of course, the processing tool does not interfere with the second sheet body 46 during processing. For the above reasons, the first valve seat 44 can be easily formed on the second seat body 46.

  At this time, the press-fitting of the first sheet body 34 is terminated when the protruding length of the lower end portion of the first sheet body 34 from the insertion port 20 reaches a predetermined length set in advance. Of course, at this time, the positions of the valve hole 40 of the first sheet body 34 and the outlet port 22 of the valve body 12 match. That is, by managing the protruding length of the first sheet body 34 to be a predetermined length, the positions of the valve hole 40 of the first sheet body 34 and the outlet port 22 of the valve body 12 can be easily matched. it can.

  Further, the valve rod 54 held by the first core member 66 is inserted into the inner hole 18, and the contact portion 56 is inserted into the first sheet body 34 (valve hole 40) from the drain hole 42 and the throttle hole 41. Let it enter. As a result, the valve stem 54 is temporarily held by the valve body 12.

  After or before the temporary holding, the annular seal member 28 is attached to the annular groove 26, and the O-ring 94 is attached to the flange portion 30 so as to circulate along the annular protrusion 32. In the present embodiment, these two sealing members are sufficient for mounting on the valve body 12. Therefore, the mounting operation is simple and the cost required for the seal member is reduced.

  Next, the valve body 12 is attached to the housing 16. That is, the flange portion 30 of the valve body 12 is press-fitted into the annular step portion 108.

  During the press-fitting, the O-ring 94 is crushed by the inner wall of the tapered hole 96 in the bobbin 82. Along with this, the inner wall of the tapered hole 96 slides with respect to the inclined surface formed in the O-ring 94, whereby the valve body 12 and the bobbin coil 86 are centered (centering of the bobbin coil 86 with respect to the valve body 12). That is, the through hole 98 (or the guide collar 76) of the bobbin 82 and the inner hole 18 of the valve body 12 can be easily aligned. For this reason, the return spring 74 is engaged with the bulging portion 78 of the guide collar 76.

  As the press-fitting of the flange portion 30 into the annular step portion 108 proceeds, the O-ring 94 and the O-ring 106 are gradually crushed. Since the O-ring 94 and the O-ring 106 are elastic bodies (generally rubber), the O-ring 94 and the O-ring 106 exhibit an elastic restoring force to return to the original shape, that is, an elastic force. To do.

  The resilience of the O-ring 94 is applied to the bobbin 82. Accordingly, the bobbin 82 is pressed toward the ceiling surface side of the housing 16. On the other hand, the elastic force of the O-ring 106 is applied to the interposition part 100 of the second core member 88. As a result, the second core member 88 is pressed toward the ceiling surface side of the housing 16, and as a result, is firmly held between the upper end surface of the bobbin 82 and the ceiling surface of the housing 16.

  As described above, even when the second core member 88 is not connected to the housing 16 or the like, the second core member 88 is held by applying the elastic force of the O-ring 94 and the O-ring 106, in other words, It can be positioned and fixed in the housing 16.

  When the press-fitting of the flange portion 30 into the annular step portion 108 is completed, the valve body 12 and the housing 16 are engaged with each other, and the solenoid valve 10 is assembled. Thereafter, the solenoid valve 10 is incorporated into an external device such as a hydraulic control device, for example, and the terminal 112 is electrically connected to a power source (not shown). At this time, the annular seal member 28 forms a seal between the solenoid valve 10 and the external device.

  The solenoid valve 10 operates as follows.

  When the electromagnetic coil 84 constituting the bobbin coil 86 is not energized, as shown in FIG. 1, the return spring 74 is extended so that the first core member 66 and the valve stem 54 are located at the bottom dead center, and the valve The ball 50 pressed by the tip surface of the contact portion 56 of the rod 54 is seated on the first valve seat 44. That is, the communication between the inlet port 36 (and the inflow hole 48) and the outlet port 22 is in a non-communication (communication cut-off) state, and the solenoid valve 10 is in a closed state.

  At this time, the outlet port 22 and the discharge port 24 communicate with each other through the valve hole 40, the throttle hole 41, the drain hole 42, and the inner hole 18. Since the drain hole 42 is a tapered hole that expands in a tapered shape from the valve hole 40 toward the inner hole 18 as described above, the length in the axial direction is reduced. For this reason, the resistance to the pressure fluid when the outlet port 22 and the discharge port 24 communicate with each other is small.

  From this state, current is supplied to the terminal 112 via the power source, whereby the electromagnetic coil 84 is energized. Along with this, an electromagnetic force that pulls the first core member 66 is generated in the solenoid unit 14. Since this electromagnetic force exceeds the elastic urging force of the return spring 74, the first core member 66 is displaced upward in FIG. 4, that is, toward the core portion 102 side of the second core member 88. As a result, the first core member 66 reaches top dead center and the return spring 74 contracts. At this time, fluid (atmosphere and hydraulic oil) in the spring hole 72 is discharged into the guide collar 76 through the breathing hole 80.

  Since the valve stem 54 is held by the first core member 66, the valve stem 54 is also displaced upward following the displacement of the first core member 66 upward. As a result, the ball 50 is released from the pressing force of the valve stem 54.

  A pressure fluid (for example, hydraulic oil) is supplied to the inlet port 36 in advance. As described above, since the pressing force against the ball 50 disappears, the ball 50 is pressed from the pressure fluid and separated from the first valve seat 44. The ball 50 is displaced upward in the valve hole 40 and is seated on the second valve seat 52. As a result, the communication between the outlet port 22 and the discharge port 24 is blocked, and the inlet port 36 and the outlet port 22 communicate with each other via the inflow hole 48 and the valve hole 40. That is, the solenoid valve 10 is opened.

  Accordingly, the pressure fluid is introduced from the inlet port 36 and the inflow hole 48, passes through the valve hole 40, and is then led out from the outlet port 22. That is, the pressure fluid flows through the solenoid valve 10.

  After an appropriate amount of pressurized fluid has circulated, the current supply from the power source to the terminal 112 is stopped, and eventually the energization of the electromagnetic coil 84 is stopped. Along with this, the electromagnetic force attracting the first core member 66 disappears. Accordingly, the return spring 74 extends and elastically biases the first core member 66.

  For this reason, the first core member 66 and the valve stem 54 are displaced downward and finally located at the bottom dead center. At this time, the fluid (atmosphere and hydraulic oil) in the guide collar 76 is introduced into the spring hole 72 through the breathing hole 80.

  Further, the ball 50 is pressed by the distal end surface of the abutting portion 56 of the valve stem 54 that is displaced, and is separated from the second valve seat 52 and seated on the first valve seat 44. As a result, the state returns to the state shown in FIG. 1, that is, the non-communication state in which the communication between the inlet port 36 (inflow hole 48) and the outlet port 22 is blocked, and the solenoid valve 10 is closed.

  At this time, since the resistance to the pressure fluid when the outlet port 22 and the discharge port 24 communicate with each other is small, the time until the solenoid valve 10 is changed from the open state to the closed state is short. That is, by making the drain hole 42 a tapered hole, the response speed from the open state to the closed state is improved.

  The present invention is not particularly limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention.

  For example, the solenoid valve 10 described above is a so-called normally closed type that is closed when energization is stopped, but may be a so-called normal open type that is open when energization is stopped.

  Further, instead of the O-ring 94, a triangular seal member made of an annular body having a substantially triangular cross section may be adopted. In this case, each of the two surfaces corresponding to the short sides may be directed to the lower end surface of the flange portion 30 and the side wall of the annular protrusion 32, and the inclined surface corresponding to the long side (bottom side) may be directed to the bobbin 82. .

  In this configuration, when the valve body 12 is press-fitted into the housing 16, the inner wall of the tapered hole 96 of the bobbin 82 slides along the slope of the triangular seal member. As a result, the bobbin 82 can be easily guided, so that the through hole 98 of the bobbin 82 and the inner hole 18 of the valve main body 12 can be easily aligned.

DESCRIPTION OF SYMBOLS 10 ... Solenoid valve 12 ... Valve body 14 ... Solenoid part 16 ... Housing 18 ... Inner hole 20 ... Insertion port 22 ... Outlet port 24 ... Discharge port 26 ... Annular groove 28 ... Annular seal member 30 ... Flange part 34 ... 1st sheet | seat body 36 ... Inlet port 40 ... Valve hole 42 ... Drain hole 44 ... First valve seat 46 ... Second seat body 48 ... Inflow hole 50 ... Ball 52 ... Second valve seat 54 ... Valve rod 56 ... Contact portion 58 ... Long Part 60: Restriction part 66 ... First core member 68 ... Holding hole 70 ... Insertion hole 72 ... Spring hole 74 ... Return spring 76 ... Guide collar 78 ... Swelling part 82 ... Bobbin 84 ... Electromagnetic coil 86 ... Bobbin coil 88 ... Second Core member 94 ... O-ring 96 ... Tapered hole 98 ... Through hole 100 ... Intermediate portion 102 ... Core portion 106 ... O-ring 112 ... Terminal

Claims (3)

A valve body in which an inlet port and an outlet port through which a pressure fluid flows are formed;
A valve body that places the inlet port and the outlet port in a communication state or a communication cut-off state by being seated on or separated from a valve seat provided inside the valve body;
A housing engaged with the valve body and containing a solenoid part therein;
With
The solenoid unit includes a bobbin coil in which an electromagnetic coil is wound around a bobbin, a first core member that is displaced in the housing in order to seat or separate the valve body from the valve seat, and an interior of the housing A second core member positioned at
The second core member includes an interposition part interposed between the end surface of the bobbin and the end surface of the housing, and a core part protruding from the interposition part and inserted into the through-hole of the bobbin together with the first core member And
The solenoid valve, wherein the core portion of the second core member is separated from the end surface of the housing.   2. The solenoid valve according to claim 1, wherein the interposition portion of the second core member only abuts on the end surface of the housing, and the second core member is detached from the housing when the bobbin coil is detached from the housing. Solenoid valve characterized by being removable. 3. The solenoid valve according to claim 1, wherein the valve body has a flange portion, a first seal member is interposed between the flange portion and the bobbin, and between the bobbin and the housing. A second seal member is interposed,
Each of the first seal member or the second seal member is crushed to give a resilient force to the bobbin or the second core member, thereby holding the second core member. Characteristic solenoid valve.

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