JP6238642B2 - Solenoid valve - Google Patents

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. An example of this type of solenoid valve is described in Patent Document 1.

  This solenoid valve is formed with a short ball accommodating hole extending along the axial direction from one bottom surface of the valve body and a long inner hole accommodating a valve rod that is displaced under the action of the solenoid part. The A ball is accommodated in the ball accommodating hole, and the valve rod is slidably supported by a bearing press-fitted into the inner hole.

  Further, an inlet port for introducing a pressure fluid into the inner hole is formed between the ball receiving hole and the inner hole, and an outer peripheral wall portion of the valve body near the bearing is in communication with the inner hole. An exit port is formed. These inlet and outlet ports extend along the diametrical direction of the valve body. In addition, a valve hole communicating with the ball receiving hole, the inlet port and the inner hole is formed so as to be orthogonal to the inlet port.

  When the electromagnetic coil is not energized, a predetermined part of the valve stem is seated on a valve seat provided in the vicinity of the valve hole, whereby the ball valve is opened and the inlet port and the outlet port are communicated. That is, the solenoid valve is open.

  On the other hand, when the electromagnetic coil is energized, the movable core constituting the solenoid portion is displaced so as to be drawn toward the electromagnetic coil side. When the valve stem is displaced away from the valve seat with this displacement, the ball valve is closed, the communication between the inlet port and the outlet port is shut off, and the solenoid valve is closed.

JP-A-9-280391

  As will be understood with reference to FIGS. 1 and 2 of Patent Document 1, the outer diameter of the valve body varies in various directions along the longitudinal direction. In other words, the valve body has a plurality of portions (or step portions) having different outer diameters.

  Such a step portion can be formed by machining the valve body, but the machining operation itself is complicated, and the valve body can be efficiently obtained for the machining operation. There is an inconvenience that cannot be done.

  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 having a valve body that can be easily manufactured.

In order to achieve the above object, the solenoid valve according to the present invention has an inner hole formed therein and an annular seal groove formed along the circumferential direction of the outer peripheral wall portion, and communicated with the inner hole. A valve body in which an inlet port and an outlet port through which a pressure fluid flows are formed;
A seal member mounted in the annular seal groove;
The inlet port and the outlet port are brought into communication with each other by seating on either the first valve seat or the second valve seat provided inside the valve body, and the second valve seat or the first valve seat A valve body that places the inlet port and the outlet port in a communication cut-off state by sitting on one of the remaining valve seats;
A solenoid unit having a bobbin coil formed by winding an electromagnetic coil around a bobbin in which a through hole is formed, and seating or separating the valve body with respect to the first valve seat or the second valve seat;
Housing for accommodating an annular stepped portion Ru engaged with the valve body, and a ceiling portion that surrounds the solenoid portion, one end is formed in the occluded cylindrical as the ceiling, the solenoid portion therein When,
Under the action of the solenoid portion, a valve stem that is displaced within the inner hole;
A bearing inserted into the inner hole and supporting the valve stem;
With
The valve body has a substantially cylindrical shape with an outer diameter being substantially equal, and has a flange portion engaged with the annular step portion at an end,
Said sealing member and said annular seal groove, while being formed only in the vicinity of the flange portion, the annular seal groove is depressed formed toward the bore from the outer peripheral wall portion,
The fitting portion of the bearing with respect to the inner hole is biased to the solenoid part side with respect to the annular seal groove, and a breathing hole that connects the through hole and the inner hole is formed in the bearing. Features.

  That is, in this case, it is not particularly necessary to perform processing for providing a step difference due to the difference in outer diameter with respect to the valve body. For this reason, it becomes possible to make the valve body (particularly, the portion exposed from the housing) into a substantially cylindrical shape having a substantially equal diameter.

  Accordingly, the number of processing steps for producing the valve body is reduced. In addition, since there is no need to provide a step due to the difference in outer diameter, the machining operation is also simple. Therefore, the valve body can be obtained efficiently.

  The annular seal groove is for mounting a seal member. Since the annular seal groove is arranged closer to the flange portion of the valve body than the inlet port, the outlet port, and the discharge port, one seal portion is sufficient. In other words, it is not particularly necessary to install a plurality of seal members. That is, since the number of seal members can be reduced, the manufacturing cost of the solenoid valve can be reduced.

In this solenoid valve, the fitting portion for the bore of the bearings for supporting the valve stem is inserted into the inner hole, Ru biases the solenoid portion side of the annular seal groove.

  For example, when the bearing is larger than the design dimension of the inner diameter of the inner hole, the part where the annular seal groove is formed (the part where the seal member is mounted) is thinner than the other parts, so the bearing is inserted into the inner hole. As a result, the valve main body is pressed from the inner peripheral wall side of the inner hole, and as a result, there is a concern that the seal member mounting portion is expanded (deformed). However, in the above configuration, the bearing is not inserted beyond the annular seal groove. Accordingly, deformation of the seal member mounting site is avoided. For this reason, the seal between the solenoid valve and the device to which the solenoid valve is attached is maintained.

  Further, in the prior art in which the bearing is inserted beyond the annular seal groove, the thickness of the valve body is increased in order to suppress deformation of the seal member mounting portion. Therefore, the thickness of the valve body can be reduced. Of course, it is also possible to reduce the diameter of the valve body. As a result, the valve body, and thus the solenoid valve, can be reduced in size and weight.

  In addition, the solenoid valve includes a bobbin coil in which an electromagnetic coil is wound around a bobbin, and a first solenoid valve that is displaced in the housing to seat or separate the valve body from the first valve seat or the second valve seat. A first core member and a second core member positioned inside the housing, and the second core member is interposed between an end surface of the bobbin and an end surface of the housing; It is preferable to have a core part protruding from the interposition part and inserted into the through-hole of the bobbin together with the first core member.

  In the solenoid valve according to the prior art, the solid fixed core is formed integrally with the housing. However, in the above configuration, the core portion of the second core member is separated from the end surface of the housing, so the second core member A hollow portion is formed between the core portion and the end surface of the housing. Accordingly, it is possible to reduce the weight as compared with the solenoid valve according to the related art.

  And since it is not necessary to provide the fixed core part integral with a housing, each shape of a housing and a 2nd core member becomes simple. 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.

  According to the present invention, since the valve main body (particularly, the portion exposed from the housing) is set to have substantially the same diameter, it is not particularly necessary to perform processing for providing a step due to the outer diameter difference on the valve main body. Therefore, the number of processing steps for manufacturing the valve body is reduced, and the processing operation is simplified. For this reason, since the valve body can be obtained efficiently, the production efficiency of the solenoid valve is improved.

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 main body 12 is a hollow body having a substantially cylindrical shape with the inner hole 18 formed therethrough, and has a long cylindrical portion 20, a flange portion 22, and an annular protrusion 24 in this order from below. An insertion port 26 is formed at the lower end of the long cylindrical portion 20, and an outlet port 28 through which the pressure fluid is led out and a discharge port 30 communicating with the inner hole 18 are formed on the outer peripheral wall portion. Is formed.

  Further, an annular seal groove 32 is formed above the discharge port 30 in the outer peripheral wall portion. An annular seal member 34 is attached to the annular seal groove 32.

  In the present embodiment, the flange portion 22 is provided above the annular seal member 34, that is, on the side close to the solenoid portion 14 and the housing 16, so as to project annularly outward in the diametrical direction. The annular projecting portion 24 projects from the upper end portion of the flange portion 22 along the axial direction of the valve body 12.

  In this case, in the outer peripheral wall portion of the valve body 12, a groove formed in a recessed manner in addition to the outlet port 28, the discharge port 30 and the annular seal groove 32 from the lower end portion of the long cylindrical portion 20 to the flange portion 22. A recess or the like is not formed, and a portion that protrudes outward in the diameter direction is not provided. The same applies to the inner peripheral wall portion up to a step portion 36 described later. For this reason, the cross section along the axial direction of the valve body 12 (particularly, the long cylindrical portion 20 exposed from the housing 16) has a substantially linear shape as shown in FIG.

  That is, the valve main body 12 (particularly, the long cylindrical portion 20) has a substantially cylindrical shape having an outer diameter that is substantially equal. The annular seal groove 32 for mounting the annular seal member 34 is formed to be recessed from the outer peripheral wall portion toward the inner hole 18, and therefore the portion where the annular seal groove 32 is formed is different from the other portions. And small diameter.

  The outlet port 28 and the discharge port 30 are formed by drilling along the diameter direction of the long cylindrical portion 20 and cutting the outer periphery of these horizontal holes. And an annular channel groove.

  A first sheet body 38 is press-fitted into the insertion port 26. The lower end portion of the first sheet body 38 slightly protrudes from the insertion port 26, that is, the lower end surface of the valve body 12.

  As shown in an enlarged view in FIG. 2, the first sheet body 38 has an inlet port 40 into which pressure fluid is introduced, a press-in hole 42, a valve hole 44, a throttle hole 45, and a drain hole 46 along the longitudinal direction thereof. Are formed in this order from the lower end side. The press-fit hole 42 has a substantially cylindrical shape, and a second seat body 50 having a first valve seat 48 at the upper end is press-fitted. Of course, the second sheet body 50 is formed with an inflow hole 52 connected to the inlet port 40. Therefore, when the solenoid valve 10 is opened, the inlet port 40 communicates with the valve hole 44 via the inflow hole 52.

  A ball 54 as a valve body is accommodated in the valve hole 44. The valve hole 44 is continuous with a lateral hole 55 formed so as to penetrate from the valve hole 44 toward the outer peripheral wall side of the first sheet body 38. For this reason, the valve hole 44 communicates with the outlet port 28 via the lateral hole 55.

  The inner peripheral wall portion in the middle from the valve hole 44 to the drain hole 46 is throttled to have a small diameter by the throttle hole 45, whereby the second valve seat 56 is provided at the upper end portion of the first seat body 38. ing. As will be described later, the ball 54 is seated on either the first valve seat 48 or the second valve seat 56.

  The drain hole 46 expands in a taper shape from the second valve seat 56 toward the inner hole 18. By this drain hole 46, the inner hole 18 communicates with the valve hole 44.

  A valve rod 58 is accommodated in the inner hole 18 (see FIG. 1). The valve stem 58 includes a contact portion 60 having the smallest diameter, a long portion 62 having the largest diameter, and an engagement portion 64 having a slightly smaller diameter than the long portion 62.

  The lower end of the abutment portion 60 enters the valve hole 44 through the drain hole 46 and the throttle hole 45, and the front end surface abuts on the ball 54. As will be described later, when the valve rod 58 applies a pressing force to the ball 54, the ball 54 is displaced from the second valve seat 56 toward the first valve seat 48.

  The valve rod 58 is held by a bearing 66 and a first core member 68 constituting the solenoid unit 14. That is, first, the bearing 66 has a small diameter and long guide part 70 and a large diameter compared to the guide part 70 and is fitted into the inner hole 18 by being press-fitted into the inner hole 18. And a disk-shaped portion 72.

  The disk-shaped portion 72 is blocked by the step portion 36 formed on the inner peripheral wall portion of the inner hole 18. The step portion 36 is provided above the annular seal groove 32, that is, at a position close to (biased from) the solenoid portion 14 and the housing 16 side.

  A guide hole 74 is formed so as to penetrate from the guide part 70 to the disk-shaped part 72, and the valve rod 58 is slidably passed through the guide hole 74. In addition, the disc-shaped portion 72 is formed with a breathing hole 76 extending along the axial direction of the valve body 12. Through the breathing hole 76, the through hole 80 of the bobbin 78 and the inner hole 18 communicate with each other.

  On the other hand, a holding hole 82 and a spring hole 84 are formed in the first core member 68 in this order from below, and the upper end of the elongated portion 62 of the valve rod 58 is press-fitted into the holding hole 82 therein. With this press-fitting, the valve stem 58 is held by the first core member 68. Accordingly, the valve stem 58 is displaced following the displacement of the first core member 68.

  A return spring 86 is accommodated in the spring hole 84, and the engaging portion 64 of the valve rod 58 is inserted into the lower end of the return spring 86. By this insertion, the lower end of the return spring 86 is engaged with the engaging portion 64, that is, the valve stem 58.

  The upper end of the return spring 86 is seated on the second core member 88 constituting the solenoid portion 14. This point will be described later.

  Here, the solenoid unit 14 will be described. In addition to the first core member 68 and the second core member 88, the solenoid unit 14 includes a bobbin coil 92 in which an electromagnetic coil 90 is wound around the bobbin 78. The second core member 88 is sandwiched between the bobbin 78 and the housing 16.

  The bobbin 78 is provided with a resin-made coil mold body 96 integrally molded together with the coupler portion 94, and in this state, is disposed above the flange portion 22 of the valve body 12. An O-ring 98 is interposed between the flange portion 22 and the bobbin 78.

  When the O-ring 98 is pressed from the bobbin 78, the O-ring 98 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 upper end surface of the flange portion 22 and the side wall of the annular projection 24. On the other hand, the inclined surface corresponding to the long side (bottom side) faces the bobbin 78.

  In addition, a tapered hole 100 is formed in the lower end portion of the bobbin 78 so that the inner peripheral wall portion has a tapered diameter as it goes upward. That is, the inner peripheral wall portion of the tapered hole 100 is an inclined surface.

  The taper angle of the inner peripheral wall portion of the taper hole 100 corresponds to the inclination angle of the inclined surface formed in the O-ring 98 by crushing. That is, the O-ring 98 is formed with an inclined surface that abuts against the inner wall of the tapered hole 100 by being pressed from the bobbin 78 and the valve body 12. The O-ring 98 seals between the valve body 12 and the bobbin coil 92 by this contact.

  Further, the bobbin 78 is formed with the through hole 80 along the longitudinal direction thereof as described above, and the axis of the through hole 80 coincides with the axis of the inner hole 18. That is, the through hole 80 is continuous with the inner hole 18.

  A first core member 68 is inserted below the through hole 80. A predetermined clearance (play) is formed between the side wall of the first core member 68 and the inner peripheral wall portion of the through hole 80. A part of the second core member 88 is inserted above the through hole 80.

  That is, the second core member 88 includes an annular interposed portion 102 and a core portion 104 formed so as to protrude from the interposed portion 102 into a cylindrical shape. The interposition part 102 is sandwiched between the upper end surface of the bobbin 78 and the inner surface (ceiling surface) of the ceiling wall of the housing 16.

  On the other hand, the core portion 104 is inserted into the through hole 80 of the bobbin 78. For this reason, the core part 104 is separated from the ceiling surface of the housing 16, and therefore, the space between the core part 104 and the housing 16 is a hollow part. The upper end surface of the return spring 86 is seated on the lower end surface of the core portion 104.

  The second core member 88 is merely inserted into the housing 16 and is not connected to the housing 16 or the bobbin 78. That is, the second core member 88 is in an unconstrained state. For this reason, for example, when the valve body 12 is detached from the housing 16 and the bobbin coil 92 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 receiving groove 106 is recessed in the upper end surface of the bobbin 78, and an O-ring 108 is received in the receiving groove 106. Therefore, the O-ring 108 is interposed between the bobbin 78 and the housing 16 (and the interposition part 102).

  An annular step portion 110 extending along the circumferential direction of the inner peripheral wall portion is formed on the inner peripheral wall portion in the vicinity of the opening of the housing 16. When the flange portion 22 of the valve body 12 is press-fitted into the annular step portion 110, the housing 16 and the valve body 12 are engaged with each other.

  Further, the coupler portion 94 of the coil mold body 96 projects from the notch 112 formed in the vicinity of the opening of the housing 16. Inside the coupler section 94, a terminal 114 made of a conductive material is provided. A current is supplied to the terminal 114 from an electric supply source (not shown).

  The solenoid valve 10 is attached to a predetermined member (for example, a body of a hydraulic control device) via an attachment stay 116 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. In addition, it is necessary to perform a cutting process for making the fixed core have a predetermined protruding length and a boring process for forming a receiving hole for inserting a part of the return spring. 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 104. 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 102 of the second core member 88 substantially corresponds to the inner diameter of the housing 16 and is slightly smaller to contact the ceiling surface as described later (see FIG. 1) . 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 102 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 102 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 portion 102 abuts on the ceiling surface of the housing 16, and the core portion 104 extends from the ceiling surface of the housing 16. Separate. Therefore, a hollow portion surrounded by the ceiling surface of the housing 16 and the core portion 104 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 92 in which the coil mold body 96 is externally mounted and the O-ring 108 is accommodated in the accommodation groove 106 is inserted into the housing 16. At this time, the core portion 104 of the second core member 88 enters the through hole 80 of the bobbin 78. With this approach, the bobbin coil 92 is guided to the core portion 104. That is, the bobbin coil 92 is prevented from being displaced in the housing 16 and smoothly reaches a predetermined position. At this time, the O-ring 108 comes into contact with the interposition part 102 of the second core member 88.

  On the other hand, the valve body 12 is produced by forging, for example. Thereafter, drilling and cutting for forming the outlet port 28 and the discharge port 30 are performed, and further, a cutting process for forming the annular seal groove 32 is performed.

  In addition to this, there is no need to perform any processing on the valve body 12 to provide a step due to a difference in outer diameter. That is, the long cylindrical portion 20 can be formed into a substantially cylindrical shape having a substantially equal diameter. Accordingly, the number of processing steps is reduced. Moreover, only one annular seal member 34 is sufficient as the seal member to be mounted on the outer peripheral wall portion of the valve body 12. That is, the number of parts of the seal member is reduced. In combination with the above, the cost for obtaining the solenoid valve 10 is further reduced.

  The bearing 66 and the assembly of the first sheet body 38 and the second sheet body 50 are press-fitted into the inner hole 18 (insertion port 26) of the valve body 12 obtained in this way.

  The outer diameter of the disk-shaped portion 72 of the bearing 66 is slightly larger than the inner diameter of the inner hole 18 from the portion corresponding to the lower side of the flange portion 22 to the stepped portion 36. Is inserted into the inner hole 18 by press-fitting. The press-fitting of the bearing 66 is terminated when the disk-shaped portion 72 is blocked by the step portion 36.

  The step portion 36 is provided above the annular seal groove 32, that is, at a position biased toward the solenoid portion 14 and the housing 16 side. For this reason, the press-fitting location (fitting location) of the disk-shaped portion 72 is also above the annular seal groove 32. In other words, the disk-shaped portion 72 is not press-fitted to the position where the annular seal groove 32 is formed, that is, the mounting portion of the annular seal member 34.

  Therefore, for example, even in the case where a bearing 66 whose outer wall of the disk-shaped portion 72 is larger than the design dimension of the inner diameter of the inner hole 18 is press-fitted into the inner hole 18, the vicinity where the annular seal groove 32 is formed. Does not bulge outward in the diameter direction. For this reason, it is not necessary to increase the thickness of the long cylindrical portion 20 in order to prevent the vicinity where the annular seal groove 32 is formed from bulging.

  As described above, the press-fitting location (fitting location) of the bearing 66 (disk-shaped portion 72) is set to a position that is biased toward the solenoid portion 14 and the housing 16 with respect to the annular seal groove 32. It is possible to avoid the deformation of the valve body 12 due to the press-fitting into the hole 18. For this reason, since it is not necessary to increase the thickness of the valve main body 12, the valve main body 12 can be thinned, and thus the solenoid valve 10 can be reduced in size and weight.

  Apart from the above, the second sheet body 50 is inserted from the inlet port 40 of the first sheet body 38 in a state where the ball 54 is inserted into the valve hole 44, and the second sheet body 50 is press-fitted into the press-fit hole 42. Further, the first sheet body 38 into which the second sheet body 50 is press-fitted, that is, the assembly is press-fitted into the insertion port 26 of the valve body 12. The press-fitting of the assembly may be after the bearing 66 is press-fitted into the inner hole 18 or before. In other words, the press-fitting order of the assembly and the bearing 66 is in no particular order.

Here, the 1st valve seat 48 is previously provided in the upper end part of the 2nd sheet | seat body 50 which makes a substantially cylindrical body shape. That is, in this case , it is not necessary to insert a processing tool into the second sheet body 50. Of course, the processing tool does not interfere with the second sheet body 50 during processing. For the reasons described above, the first valve seat 48 can be easily formed on the second seat body 50.

At this time, the press-fitting of the first sheet body 38 (assembly) is finished when the protruding length of the lower end portion of the first sheet body 38 from the insertion port 26 reaches a preset predetermined length. Of course, at this time, the positions of the valve hole 44 (lateral hole 55) of the first sheet body 38 and the outlet port 28 of the valve body 12 match. That is, by managing the protruding length of the first sheet body 38 to be a predetermined length, the positions of the valve hole 44 of the first sheet body 38 and the outlet port 28 of the valve body 12 can be easily matched. it can.

While performing the above operation, the valve rod 58 is inserted into the holding hole 82 of the first core member 68 from the engaging portion 64 side. Since the diameter of the long portion 62 of the valve rod 58 is slightly larger than the diameter (inner diameter) of the holding hole 82, the insertion of the long portion 62 into the holding hole 82 is press-fitted. Further, the first core member 68 is held by the valve body 12 via the valve rod 58 by passing the elongated portion 62 through the guide hole 74 of the bearing 66.

  Next, the return spring 86 is inserted into the spring hole 84 of the first core member 68, and the engaging portion 64 of the valve rod 58 is inserted into one end (the lower end in FIG. 1). As a result, the return spring 86 is locked to the valve rod 58 and the other end (the upper end in FIG. 1) is exposed from the spring hole 84.

  Next, the annular seal member 34 is attached to the annular seal groove 32, and the O-ring 98 is attached so as to be seated on the flange portion 22 and circulate along the annular protrusion 24. 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.

The valve body 12 is attached to the housing 16. That is, the flange portion 22 of the valve body 12 is press-fitted into the annular step portion 110. With this press-fitting, the other end of the return spring 86 which is exposed from the spring hole 84, seated under the end face of the core portion 104 of the second core member 88.

  During this press-fitting, the O-ring 98 is crushed by the inner peripheral wall portion of the tapered hole 100 in the bobbin 78. Accordingly, the inner wall of the tapered hole 100 slides with respect to the inclined surface formed in the O-ring 98, whereby the valve body 12 and the bobbin coil 92 are centered (centering of the bobbin coil 92 with respect to the valve body 12). That is, the alignment of the through hole 80 of the bobbin 78 and the inner hole 18 of the valve body 12 can be easily performed.

  As the press-fitting of the flange 22 into the annular step 110 proceeds, the O-ring 98 and the O-ring 108 are gradually crushed. Since the O-ring 98 and the O-ring 108 are elastic bodies (generally rubber), the O-ring 98 and the O-ring 108 exhibit an elastic restoring force, that is, an elastic force to return to the original shape. To do.

  The resilience of the O-ring 98 is applied to the bobbin 78. Therefore, the bobbin 78 is pressed against the ceiling surface side of the housing 16. On the other hand, the elastic force of the O-ring 108 is applied to the interposition part 102 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 78 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 98 and the O-ring 108, in other words, It can be positioned and fixed in the housing 16.

  When the press-fitting of the flange portion 22 into the annular step portion 110 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 in an external device such as a hydraulic control device, for example, and the terminal 114 is electrically connected to a power source (not shown). At this time, the annular seal member 34 forms a seal between the solenoid valve 10 and the external device.

  The solenoid valve 10 operates as follows.

  When the electromagnetic coil 90 constituting the bobbin coil 92 is not energized, as shown in FIG. 1, the return spring 86 is extended so that the first core member 68 and the valve stem 58 are positioned at the bottom dead center, and the valve The ball 54 pressed by the front end surface of the contact portion 60 of the rod 58 is seated on the first valve seat 48. That is, the communication between the inlet port 40 (inflow hole 52) and the outlet port 28 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 28 and the discharge port 30 communicate with each other through the valve hole 44, the throttle hole 45, the drain hole 46, and the inner hole 18. Since the drain hole 46 is a tapered hole that expands in a tapered shape from the valve hole 44 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 28 and the discharge port 30 communicate with each other is small.

  From this state, current is supplied to the terminal 114 via the power source, whereby the electromagnetic coil 90 is energized. Along with this, an electromagnetic force attracting the first core member 68 is generated in the solenoid unit 14. Since this electromagnetic force exceeds the elastic urging force of the return spring 86, the first core member 68 is displaced upward in FIG. 4, that is, toward the core portion 104 side of the second core member 88. As a result, the first core member 68 reaches top dead center and the return spring 86 contracts. At this time, the fluid (atmosphere and hydraulic fluid) in the through hole 80 of the bobbin 78 passes through the breathing hole 76 formed in the bearing 66 and is introduced into the inner hole 18, and further from the discharge port 30 to the valve body 12. It is discharged outside.

  Since the valve stem 58 is held by the first core member 68, the first core member 68 follows the upward displacement, and the valve stem 58 is displaced upward while being guided by the guide hole 74. As a result, the ball 54 is released from the pressing force of the valve rod 58.

  A pressure fluid (for example, hydraulic oil) is supplied to the inlet port 40 in advance. As described above, since the pressing force with respect to the ball 54 has disappeared, the ball 54 is pressed from the pressure fluid and separated from the first valve seat 48. The ball 54 is displaced upward in the valve hole 44 and seated on the second valve seat 56. As a result, the communication between the outlet port 28 and the discharge port 30 is blocked, and the inlet port 40 and the outlet port 28 communicate with each other via the inflow hole 52, the valve hole 44, and the lateral hole 55. That is, the solenoid valve 10 is opened.

  Along with this, the pressure fluid is introduced from the inlet port 40 (inflow hole 52), passes through the valve hole 44, and then is led out from the outlet port 28 through the lateral hole 55. 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 114 is stopped, and the energization of the electromagnetic coil 90 is eventually stopped. Along with this, the electromagnetic force attracting the first core member 68 disappears. Accordingly, the return spring 86 extends to elastically bias the first core member 68.

  For this reason, the first core member 68 and the valve rod 58 are displaced downward and finally located at the bottom dead center. At this time, the fluid (atmosphere and hydraulic oil) in the inner hole 18 is introduced into the through hole 80 of the bobbin 78 through the breathing hole 76.

  Further, the ball 54 is pressed by the front end surface of the contact portion 60 of the valve rod 58 that is displaced downward while being guided by the guide hole 74, and is separated from the second valve seat 56 and seated on the first valve seat 48. 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 40 (inflow hole 52) and the outlet port 28 is blocked, and the solenoid valve 10 is closed.

  At this time, since the resistance to the pressure fluid when the outlet port 28 and the discharge port 30 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 46 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.

DESCRIPTION OF SYMBOLS 10 ... Solenoid valve 12 ... Valve main body 14 ... Solenoid part 16 ... Housing 18 ... Inner hole 20 ... Long cylindrical part 22 ... Flange part 24 ... Ring-shaped protrusion 26 ... Insertion port 28 ... Outlet port 30 ... Discharge port 32 ... Ring Seal groove 34 ... annular seal member 36 ... step portion 38 ... first seat body 40 ... inlet port 44 ... valve hole 48 ... first valve seat 50 ... second seat body 52 ... inflow hole 54 ... ball 56 ... second valve seat 58 ... Valve rod 66 ... Bearing 68 ... First core member 70 ... Guide portion 72 ... Disc-shaped portion 74 ... Guide hole 78 ... Bobbin 80 ... Through hole 82 ... Holding hole 84 ... Spring hole 86 ... Return spring 88 ... Second core Member 90 ... Electromagnetic coil 92 ... Bobbin coil 98 ... O-ring 100 ... Tapered hole 102 ... Interposition part 104 ... Core part 108 ... O-ring 110 ... Annular step

Claims (3)

A valve body in which an inner hole is formed, an annular seal groove is formed along the circumferential direction of the outer peripheral wall, and an inlet port and an outlet port that communicate with the inner hole and through which pressure fluid flows are formed; ,
A seal member mounted in the annular seal groove;
The inlet port and the outlet port are brought into communication with each other by seating on either the first valve seat or the second valve seat provided inside the valve body, and the second valve seat or the first valve seat A valve body that places the inlet port and the outlet port in a communication cut-off state by sitting on one of the remaining valve seats;
A solenoid unit having a bobbin coil formed by winding an electromagnetic coil around a bobbin in which a through hole is formed, and seating or separating the valve body with respect to the first valve seat or the second valve seat;
Housing for accommodating an annular stepped portion Ru engaged with the valve body, and a ceiling portion that surrounds the solenoid portion, one end is formed in the occluded cylindrical as the ceiling, the solenoid portion therein When,
Under the action of the solenoid portion, a valve stem that is displaced within the inner hole;
A bearing inserted into the inner hole and supporting the valve stem;
With
The valve body has a substantially cylindrical shape with an outer diameter being substantially equal, and has a flange portion engaged with the annular step portion at an end,
Said sealing member and said annular seal groove, while being formed only in the vicinity of the flange portion, the annular seal groove is depressed formed toward the bore from the outer peripheral wall portion,
The fitting portion of the bearing with respect to the inner hole is biased to the solenoid part side with respect to the annular seal groove, and a breathing hole that connects the through hole and the inner hole is formed in the bearing. Characteristic solenoid valve. In the solenoid valve according to claim 1 Symbol placement, the solenoid unit includes a Bobinkoiru the electromagnetic coil is wound around a bobbin, to seat or away from the valve body relative to the first valve seat and the second valve seat A first core member that is displaced within the housing and a second core member that is positioned within the housing;
The second core member, an end surface of the bobbin, the core being inserted into the through hole of the bobbin and the intermediate portion interposed, together with the first core member projects from the intermediate portion between the end face of the housing And
The solenoid valve, wherein the core portion of the second core member is separated from the ceiling portion of the housing. 3. The solenoid valve according to claim 2 , wherein the interposition part of the second core member only abuts on the end surface of the housing, and the second core member is removed from the housing when the bobbin coil is detached from the housing. Solenoid valve characterized by being removable.

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