solenoid valve

Abstract

To effectively reduce hysteresis in operation in a solenoid valve constituted so that a stator core attracts a valve in an axial direction by magnetic force generated by a coil.SOLUTION: A solenoid valve 1 includes: a coil 2; a stator core 3 having the coil 2 arranged outside and a bore 12a inside; a valve 4 which is disposed in the bore 12a so as to be reciprocatable in an axial direction thereof and has sliding portions 21 and 22 disposed on an outer periphery thereof; and portions 31 and 32 to be slid which are disposed on an inner periphery of the bore 12a and on which the sliding portions 21 and 22 of the valve 4 slide when the valve 4 reciprocates. The solenoid valve 1 is configured such that the stator core 3 attracts the valve 4 in an axial direction by magnetic force generated by the coil 2 in order to reciprocate the valve 4. A part of the outer periphery of the valve 4 forms a magnetic circuit 16 between itself and the stator core 3, and the other part of the outer periphery of the valve 4 which does not form the magnetic circuit 16 serves as sliding potions 21 and 22.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The technology disclosed in this specification relates to a solenoid valve configured such that a stator core attracts a valve in the axial direction by magnetic force generated by a coil to cause the valve to reciprocate. [Background technology]

[0002] A known example of this type of technology is the "linear solenoid" described in Patent Document 1 below. This linear solenoid includes a coil that generates magnetic force when energized, a plunger supported for axial sliding, a stator core with an internal sliding hole, and a shaft that transmits the attractive force generated by the plunger to the outside of the stator core. The stator core is a core integrally provided with a magnetic attraction core that attracts the plunger in the axial direction using the magnetic force generated by the coil, a magnetic conduction core that transfers magnetic force to the plunger in the radial direction, and a first magnetic shielding portion that inhibits direct magnetic flux coupling between the magnetic attraction core and the magnetic conduction core. In this linear solenoid, the plunger and shaft are integrally provided via a magnetic coupling inhibition means that inhibits direct magnetic flux coupling between the plunger and the shaft. The plunger has a first protrusion that protrudes radially from its outer peripheral surface. The shaft has a second protrusion that protrudes radially from its outer peripheral surface. The first protrusion and the second protrusion are adapted to slide directly against the inner circumferential surface of the sliding hole of the stator core. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-168425 Summary of the Invention [Problem to be solved by the invention]

[0004] The linear solenoid described above has a structure in which the protrusions slide in the sliding holes of the stator core at two locations where the lateral force (side force) due to magnetic force is small. However, one of these locations is sandwiched between locations where side force is generated, so the effect of reducing hysteresis is small. To suppress hysteresis in a linear solenoid, it is effective to reduce the side force and reduce sliding resistance by using sliding with a non-magnetic material. For example, if the plunger and stator core were to slide directly rather than using a shaft, the linear solenoid's size could be reduced, but non-magnetic plating or other non-magnetic materials would be required to achieve sliding with a non-magnetic material. Furthermore, even when sliding in a location with low magnetic flux, as in the linear solenoid described above, the sliding is not completely non-magnetic, so the effect of reducing hysteresis is thought to be small.

[0005] This disclosed technology has been made in consideration of the above circumstances, and its purpose is to make it possible to effectively reduce the operational hysteresis of a solenoid valve configured so that a stator core attracts a valve in the axial direction by magnetic force generated by a coil. [Means for solving the problem]

[0006] In order to achieve the above object, the technology described in claim 1 comprises a coil that generates a magnetic force when energized, a stator core having the coil disposed on the outside and a bore on the inside, a valve that is disposed in the bore so as to be able to reciprocate in the axial direction and has a sliding part disposed on the outer periphery, and a slidable part that is disposed on the inner periphery of the bore and against which the sliding part of the valve slides when the valve reciprocates. 、 In this solenoid valve, a part of the outer periphery of the valve forms a magnetic circuit with the stator core, and the other part of the outer periphery of the valve that does not form the magnetic circuit is a sliding part. The valve includes one end, a sliding part that does not form a magnetic circuit is arranged on the outer periphery of the one end, a valve seat on which the valve can be seated is arranged in a position opposite the one end of the valve, the sliding part is composed of a non-magnetic sleeve that is integral with the valve seat, and the reciprocating movement of the valve relative to the valve seat is guided by the sleeve. The purpose of this is to

[0007] According to the configuration of the above technology, a valve is arranged in a bore of a stator core so as to be able to reciprocate in the axial direction, a sliding part is arranged on the outer periphery of the valve, and a slidable part against which the sliding part of the valve slides as the valve reciprocates is arranged on the inner periphery of the bore. Here, a part of the outer periphery of the valve forms a magnetic circuit with the stator core, and another part of the outer periphery of the valve that does not form the magnetic circuit serves as the sliding part. Therefore, when the valve reciprocates in the bore of the stator core, the sliding part of the valve slides on the corresponding slidable part of the bore, but because the sliding part is arranged on the outer periphery of the valve that does not form the magnetic circuit, the side force due to magnetic force acting on the valve is reduced. Furthermore, the sliding portion on which the sliding portion of the valve slides is composed of a non-magnetic sleeve that is integral with the valve seat, so the valve seat is used to provide the non-magnetic sliding portion, and the reciprocating motion of the valve relative to the valve seat is guided by the sleeve.

[0012] In order to achieve the above object, claims 2 The technology described in claim 1 to In the described technology, the valve other end Including, other end The sliding portion, which does not form a magnetic circuit, is disposed on the outer periphery of the stator core, and the sliding portion is composed of a non-magnetic ring that is separate from the stator core.

[0013] According to the configuration of the above technology, claims 1 to In addition to the effects of the above technology, the stator core is provided with a non-magnetic sliding portion formed by a ring, so no magnetic circuit is formed between the sliding portion and the sliding portion, further reducing the side force caused by magnetic force acting on the valve.

[0014] In order to achieve the above object, claims 3 The technology described in claim 1 to In the described technology, the valve other end Including, other end The sliding portion is arranged on the outer periphery of the valve, and the sliding portion is composed of a non-magnetic ring that is separate from the valve.

[0015] According to the configuration of the above technology, claims 1In addition to the effect of the technology described in 2. above, since the sliding part is made of a non-magnetic ring that is separate from the valve, no magnetic circuit is formed between the sliding part and the part that is slid, which further reduces the side force caused by magnetic force acting on the valve. [Effects of the Invention]

[0020] According to the technology described in claim 1, in a solenoid valve configured such that the stator core attracts the valve in the axial direction by the magnetic force generated by the coil, it is possible to reduce the sliding resistance caused by the reciprocating movement of the valve, and to effectively reduce the operational hysteresis of the solenoid valve. Furthermore, a non-magnetic sliding portion can be provided without increasing the number of parts of the solenoid valve, and the coaxial accuracy of the valve with respect to the valve seat can be improved.

[0023] Claim 2 According to the technology described in claim 1 to In addition to the effects of the described technology, the operational hysteresis of the solenoid valve can be further effectively reduced.

[0024] Claim 3 According to the technology described in claim 1 to In addition to the effects of the described technology, the operational hysteresis of the solenoid valve can be further effectively reduced. [Brief explanation of the drawings]

[0027] [Figure 1] FIG. 2 is a cross-sectional view showing the solenoid valve according to the first embodiment. [Figure 2] 2 is an enlarged cross-sectional view showing the vicinity of the valve seat of the solenoid valve of FIG. 1 according to the first embodiment. [Figure 3] 2 is an enlarged cross-sectional view showing the vicinity of a ring in the solenoid valve of FIG. 1 according to the first embodiment. [Figure 4] 4 is a graph showing the relationship between the value of current applied to a coil and the flow rate of fluid in the solenoid valve according to the first embodiment. [Figure 5] 10 is a cross-sectional view equivalent to FIG. 2 showing the vicinity of a valve seat of a solenoid valve according to a second embodiment. [Figure 6] 2 showing the vicinity of a valve seat of a solenoid valve according to a third embodiment. [Figure 7] 10 is a cross-sectional view equivalent to FIG. 3 showing the vicinity of a ring in a solenoid valve according to a fourth embodiment. [Figure 8] 10 is a cross-sectional view equivalent to FIG. 6 showing the vicinity of a valve seat in a solenoid valve according to a fifth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0028] First Embodiment A first embodiment of a solenoid valve will be described in detail below with reference to the drawings.

[0029] [Solenoid valve configuration] 1 shows a cross-sectional view of a solenoid valve 1 according to this embodiment. The solenoid valve 1 includes a coil 2 that generates a magnetic force when energized, a substantially cylindrical stator core 3 having a bore 12a on the inside and the coil 2 disposed on the outside, a substantially cylindrical valve 4 that is disposed in the bore 12a so as to be able to reciprocate in the axial direction and has sliding portions 21 and 22 disposed on the outer periphery, and sliding-receiving portions 31 and 32 that are disposed on the inner periphery of the bore 12a and against which the sliding portions 21 and 22 slide when the valve 4 reciprocates. The coil 2 is covered by a resin casing 5, and the outside of the casing 5 is covered by a yoke 6 made of a magnetic material. A power supply connector 7 is formed in a part of the casing 5.

[0030] The stator core 3 is made of a magnetic material and is composed of an upper core body 11 in FIG. 1 and a cylindrical body 12 extending coaxially downward from the core body 11. The core body 11 has a center hole 11a extending in its axial direction, and the body 12 has a bore 12a extending in the axial direction. The valve 4 is made of a magnetic material and has a center hole 4a and a tip hole 4b that penetrates from the center hole 4a to a valve seat 14. A ring 13 made of a non-magnetic material is disposed between the core body 11 and the body 12. A valve seat 14, on which the valve 4 can be seated, is disposed at the lower end of the body 12 in a position opposite the lower end of the valve 4. The valve seat 14 has a valve hole 14a and is made of a non-magnetic material. A spring 15 is disposed between the upper end of the valve 4 and the lower end of the core body 11 to bias the valve 4 in a direction to seat on the valve seat 14 (valve closing direction). In this solenoid valve 1, when the coil 2 is energized, a magnetic circuit 16 is formed between the members 4, 6, 11, and 12 as shown by the broken lines in FIG.

[0031] This solenoid valve 1 is configured such that the stator core 3 attracts the valve 4 in the axial direction due to the magnetic force generated by the coil 2, causing the valve 4 to reciprocate. That is, when the solenoid valve 1 is opened, the magnetic force generated by the coil 2 causes the stator core 3 to attract the valve 4 in the axial direction against the biasing force of the spring 15. As a result, the valve 4 moves away from the valve seat 14 (opening), and the valve orifice 14a is opened. In this open state, the valve orifice 14a communicates with the center bore 4a of the valve 4 and the center bore 11a of the core body 11, allowing fluid to flow through the flow path. When the solenoid valve 1 is closed, the generation of magnetic force by the coil 2 is stopped, and the attraction of the valve 4 by the stator core 3 is stopped. As a result, the biasing force of the spring 15 causes the valve 4 to seat on the valve seat 14 (closing), and the valve orifice 14a is closed. This solenoid valve 1 constitutes a linear solenoid valve in that it reciprocates the valve 4 relative to the stator core 3.

[0032] [Sliding parts and sliding parts] The solenoid valve 1 of this embodiment has a hysteresis characteristic in which the displacement of the valve 4 differs depending on whether the current to the coil 2 increases or decreases, even when the current value is the same. This hysteresis characteristic is caused by the sliding resistance between the valve 4 and the body 12 acting in the opposite direction to the movement of the valve 4. Therefore, reducing the sliding resistance of the valve 4 relative to the body 12 is effective in reducing hysteresis. Therefore, in this embodiment, in order to reduce the sliding resistance of the valve 4, the sliding portions 21, 22 and the slidable portions 31, 32 are defined as follows.

[0033] Fig. 2 is an enlarged cross-sectional view of the vicinity of the valve seat 14 of the solenoid valve 1 of Fig. 1. Fig. 3 is an enlarged cross-sectional view of the vicinity of the ring 13 of the solenoid valve 1 of Fig. 1. In this embodiment, as shown in Figs. 1 to 3, a part of the outer periphery of the valve 4 forms a magnetic circuit 16 with the body 12, and other parts of the outer periphery of the valve 4 that do not form the magnetic circuit 16 serve as sliding parts 21 and 22. Furthermore, on the inner periphery of the bore 12a of the body 12, parts against which the sliding parts 21 and 22 of the valve 4 slide serve as slidable parts 31 and 32.

[0034] That is, in this embodiment, as shown in FIGS. 1 and 2, the inner periphery of the bore 12a corresponding to the lower end of the body 12 constitutes the first sliding portion 31. The outer periphery of the lower end of the valve 4, which slides against the first sliding portion 31, constitutes the first sliding portion 21. As shown in FIG. 2, a portion of the outer periphery of the lower end of the valve 4 forms a magnetic circuit 16 with the body 12, and the other portion of the outer periphery of the lower end of the valve 4, which does not form the magnetic circuit 16, constitutes the first sliding portion 21, which is slidably supported by the first sliding portion 31. In FIG. 2, the range of the first sliding portion 21 and the first sliding portion 31 is indicated by a two-dot chain ellipse S1. In this embodiment, the first sliding portion 31 is composed of a nonmagnetic sleeve 14b that is integral with the valve seat 14. This sleeve 14b is formed separately from the body 12 to make a portion of the body 12 nonmagnetic, but constitutes part of the body 12 in the sense that the valve 4 slides against it. In this embodiment, the sleeve 14b of the valve seat 14 is fitted to the inside of the lower end of the body 12. In this embodiment, the inner periphery of the sleeve 14b protrudes slightly further toward the valve 4 than the inner periphery of the rest of the body 12, and the first sliding portion 21 of the valve 4 is slidably supported by the first slidable portion 31 of the sleeve 14b.

[0035] On the other hand, in this embodiment, as shown in FIGS. 1 and 3 , the inner periphery of the ring 13 corresponding to the upper end of the body 12 serves as the second sliding portion 32. The outer periphery of the upper end of the valve 4, which slides against the second sliding portion 32, serves as the second sliding portion 22. As shown in FIG. 3 , a portion of the upper end of the valve 4 forms the magnetic circuit 16 with the core body 11, while the other portion of the outer periphery of the upper end of the valve 4, which does not form the magnetic circuit 16, serves as the second sliding portion 22, which is slidably supported by the second sliding portion 32. In FIG. 3 , the range of the second sliding portion 22 and the second sliding portion 32 is indicated by a dashed-two-dot ellipse S2. In this embodiment, as shown in FIG. 3 , the inner periphery of the ring 13 slightly protrudes toward the valve 4 beyond the inner periphery of the body 12, and the second sliding portion 22 of the valve 4 is slidably supported by the second sliding portion 32 of the ring 13.

[0036] In this embodiment, strictly speaking, the inner periphery of the bore 12a of the body 12 contacts the first sliding portion 21 and the second sliding portion 22 on the outer periphery of the valve 4 only at the first sliding portion 31 and the second sliding portion 32, and other parts do not contact the outer periphery of the valve 4. In other words, in parts other than the sliding portions 31 and 32, a minute gap is formed between the outer periphery of the valve 4 and the inner periphery of the bore 12a.

[0037] [About the action and effect of solenoid valves] According to the configuration of the solenoid valve 1 of this embodiment described above, the valve 4 is formed from a single member, is housed in the bore 12a of the stator core 3 (body 12), and is arranged to be able to reciprocate in the axial direction in the bore 12a. In addition, sliding portions 21, 22 are arranged on the outer periphery of the valve 4, and slidable portions 31, 32, against which the sliding portions 21, 22 of the valve 4 slide when the valve 4 reciprocates, are arranged on the inner periphery of the bore 12a. Here, a part of the outer periphery of the valve 4 forms a magnetic circuit 16 with the stator core 3, and the other parts of the outer periphery of the valve 4 that do not form the magnetic circuit 16 serve as the sliding portions 21, 22. Therefore, when the valve 4 reciprocates in the bore 12a of the stator core 3, the sliding portions 21, 22 of the valve 4 slide on the corresponding slidable portions 31, 32 of the bore 12a, but because the sliding portions 21, 22 are arranged on the outer periphery of the valve 4 that do not form the magnetic circuit 16, the side force due to the magnetic force acting on the valve 4 is small. Therefore, in a solenoid valve 1 configured so that the stator core 3 attracts the valve 4 in the axial direction by the magnetic force generated by the coil 2, the sliding resistance associated with the reciprocating movement of the valve 4 can be reduced, and the operational hysteresis of the solenoid valve 1 can be effectively reduced.

[0038] According to the configuration of this embodiment, the first sliding portion 31 is formed by the sleeve 14b made of a non-magnetic material, so no magnetic circuit is formed between the first sliding portion 21 and the first sliding portion 31. Furthermore, the second sliding portion 32 is formed by the ring 13 made of a non-magnetic material, so no magnetic circuit is formed between the second sliding portion 22 and the second sliding portion 32. In other words, the sliding portions 21 and 22 of the valve 4 slide on non-magnetic portions. Therefore, the side force due to the magnetic force acting on the valve 4 is further reduced. In this sense, the operational hysteresis of the solenoid valve 1 can be further effectively reduced.

[0039] According to the configuration of this embodiment, the first sliding portion 31, on which the first sliding portion 21 of the valve 4 slides, is composed of a non-magnetic sleeve 14b that is integral with the valve seat 14, and therefore the valve seat 14 is used to provide the non-magnetic first sliding portion 31. Furthermore, the reciprocating movement of the valve 4 relative to the valve seat 14 is guided by the sleeve 14b. Therefore, the non-magnetic first sliding portion 31 can be provided without increasing the number of parts of the solenoid valve 1, and the coaxial accuracy of the valve 4 relative to the valve seat 14 can be improved.

[0040] According to the configuration of this embodiment, the non-magnetic second sliding portion 32 is provided on the stator core 3 (body 12) by the ring 13, so no magnetic circuit is formed between the sliding portion 32 and the second sliding portion 22. Therefore, the side force due to the magnetic force acting on the valve 4 is further reduced accordingly. That is, in this embodiment, the side force due to the magnetic force acting on the valve 4 is further reduced for both the first sliding portion 21 and the second sliding portion 22. In this sense, the operational hysteresis of the solenoid valve 1 can be further effectively reduced.

[0041] Figure 4 is a graph showing the relationship between the current value applied to the coil 2 and the flow rate of the fluid for the solenoid valve 1 of this embodiment. In Figure 4, the solid line shows the hysteresis characteristic of this embodiment, and the dashed line shows the hysteresis characteristic of a comparative example that does not have the characteristics of this embodiment. In Figure 4, when comparing flow rate changes at a certain current value α1, the flow rate change ΔQ1 of this embodiment showed a reduction effect of "40 to 70%" compared to the flow rate change ΔQ2 of the comparative example.

[0042] Second Embodiment Next, a second embodiment of the solenoid valve will be described in detail with reference to the drawings. In the following description, the same components as those in the first embodiment will be given the same reference numerals and will not be described again, and the following description will focus on the differences.

[0043] [Sliding parts and sliding parts] This embodiment differs from the first embodiment in the configuration of the first sliding portion 31. FIG. 5 is a cross-sectional view similar to FIG. 2 showing the vicinity of the valve seat 14 of the solenoid valve 1. As shown in FIG. 5, in this embodiment, the sleeve 14b of the valve seat 14 is shorter than that of the first embodiment, so that the sleeve 14b does not come into contact with the valve 4. Instead, the inner periphery of the bore 12a, on which the first sliding portion 21 of the valve 4 that does not form the magnetic circuit 16 slides, serves as the first sliding portion 31. As shown in FIG. 5, the inner diameter of the bore 12a, on which the first sliding portion 21 of the outer periphery of the valve 4 that does not form the magnetic circuit 16 slides, is slightly smaller than the inner diameter of the rest of the body 12. Therefore, this inner periphery protrudes toward the valve 4 more than the inner periphery of the rest of the body 12, and this protruding portion serves as the first sliding portion 31. That is, in this embodiment, the first sliding portion 21 and the first sliding portion 31 are disposed between the valve 4 and the body 12, which are magnetic.

[0044] [About the action and effect of solenoid valves] According to the configuration of the solenoid valve 1 of this embodiment described above, unlike the first embodiment, the first sliding part 31 is not disposed in a non-magnetic part of the body 12, but is disposed in a location where there is little magnetic flux and where the magnetic circuit 16 is not formed. In other words, the first sliding part 21 of the valve 4 does not slide in a non-magnetic part, but slides in a location where there is little magnetic flux, and the side force due to the magnetic force acting on the valve 4 is correspondingly smaller. In this sense, the sliding resistance associated with the reciprocating movement of the valve 4 in the solenoid valve 1 can be reduced, and the operational hysteresis of the solenoid valve 1 can be effectively reduced.

[0045] Third Embodiment Next, a third embodiment of the solenoid valve will be described in detail with reference to the drawings.

[0046] [Sliding parts and sliding parts] This embodiment differs from the second embodiment in the configuration of the first sliding portion 21. FIG. 6 is a cross-sectional view similar to FIG. 2 showing the vicinity of the valve seat 14 of the solenoid valve 1. As shown in FIG. 6, in this embodiment, the first sliding portion 21 on the outer periphery of the valve 4, which does not form the magnetic circuit 16, is composed of a convex portion 4c that protrudes toward the first sliding portion 31. This convex portion 4c is formed integrally with the valve 4. The inner periphery of the bore 12a with which the convex portion 4c comes into contact forms the first sliding portion 31. In this embodiment, as shown in FIG. 6, the inner diameter of the inner periphery of the bore 12a, on which the first sliding portion 21 (convex portion 4c) on the outer periphery of the valve 4, which does not form the magnetic circuit 16, slides, is the same as the inner diameter of the rest of the body 12.

[0047] [About the action and effect of solenoid valves] According to the configuration of the solenoid valve 1 of this embodiment described above, compared to the second embodiment, the first sliding portion 21 is configured with the convex portion 4c, so the contact area of ​​the first sliding portion 21 with the first slidable portion 31 is smaller. Therefore, the sliding resistance of the valve 4 of the solenoid valve 1 can be further reduced, and the operational hysteresis of the solenoid valve 1 can be further effectively reduced.

[0048] <Fourth embodiment> Next, a fourth embodiment of the solenoid valve will be described in detail with reference to the drawings.

[0049] [Sliding parts and sliding parts] This embodiment differs from the first embodiment in the configuration of the second sliding portion 21. Fig. 7 is a cross-sectional view similar to Fig. 3 showing the vicinity of the ring 18 of the solenoid valve 1. As shown in Fig. 7, in this embodiment, the second sliding portion 22 on the outer periphery of the valve 4, which does not form the magnetic circuit 16, is composed of a non-magnetic ring 18 that is separate from the valve 4.

[0050] [About the action and effect of solenoid valves] According to the configuration of the solenoid valve 1 of this embodiment described above, unlike the first embodiment, the second sliding part 22 is configured from a non-magnetic ring 18 that is separate from the valve, so no magnetic circuit is formed between the second sliding part 22 and the second slidable part 32. This further reduces the side force caused by the magnetic force acting on the valve 4. As a result, the sliding resistance of the valve 4 in the solenoid valve 1 can be further reduced, and the operational hysteresis of the solenoid valve 1 can be further effectively reduced.

[0051] Fifth Embodiment Next, a fifth embodiment of the solenoid valve will be described in detail with reference to the drawings.

[0052] [Sliding parts and sliding parts] This embodiment differs from the third embodiment in the configuration of the first sliding portion 21. Fig. 8 is a cross-sectional view similar to Fig. 6 showing the vicinity of the valve seat 14 of the solenoid valve 1. As shown in Fig. 8, in this embodiment, the first slidable portion 31 corresponding to the first sliding portion 21 on the outer periphery of the valve 4 that does not form the magnetic circuit 16 is composed of a convex portion 12b that protrudes toward the first sliding portion 21. This convex portion 12b is formed integrally with the body 12. The outer periphery of the valve 4 that comes into contact with this convex portion 12b forms the first sliding portion 21.

[0053] [About the action and effect of solenoid valves] The configuration of the solenoid valve 1 of this embodiment described above can achieve the same effects and advantages as those of the third embodiment. That is, because the first sliding portion 31 is configured with the convex portion 12b, the contact area of ​​the first sliding portion 31 with the first sliding portion 21 is reduced. Therefore, the sliding resistance of the valve 4 of the solenoid valve 1 can be further reduced, and the operational hysteresis of the solenoid valve 1 can be further effectively reduced.

[0054] <Another embodiment> The disclosed technology is not limited to the above-described embodiments, and can be implemented by appropriately modifying part of the configuration within the scope of the disclosed technology.

[0055] (1) In the above embodiments, the stator core 3 is made up of a plurality of parts, namely the core body 11, the body 12, and the ring 13. However, the stator core can also be made up of a single part.

[0056] (2) In the third embodiment, the first sliding portion 21 of the valve 4 is configured as a protrusion 4c made of a magnetic material that is integrated with the valve 4, but this protrusion can also be configured as a non-magnetic material. [Industrial Applicability]

[0057] The disclosed technology can be used in linear solenoid type electromagnetic valves used to control fluid flow rates. [Explanation of symbols]

[0058] 1 solenoid valve 2 coils 3 stator core 4 valves 4c Convex part 12a Bore 12b Convex part 13. Ring 14 Valve seat 14b sleeve 16 Magnetic Circuit 18 Ring 21 First sliding part 22 Second sliding part 31 First sliding part 32 Second sliding part

Claims

1. A coil that generates magnetic force when energized; a stator core having the coil disposed on its outside and a bore on its inside; a valve disposed in the bore so as to be reciprocable in its axial direction, the valve having a sliding portion disposed on its outer periphery; a sliding portion disposed on an inner periphery of the bore, against which the sliding portion of the valve slides when the valve reciprocates; In the solenoid valve, the stator core is configured to attract the valve in the axial direction by a magnetic force generated by the coil to reciprocate the valve, a part of the outer periphery of the valve forms a magnetic circuit with the stator core, and another part of the outer periphery of the valve that does not form the magnetic circuit becomes the sliding part, the valve includes one end, and the sliding part that does not form the magnetic circuit is disposed on an outer periphery of the one end, a valve seat on which the valve can be seated is disposed at a position opposite to the one end of the valve; the sliding portion is composed of a non-magnetic sleeve that is integral with the valve seat, The reciprocating movement of the valve relative to the valve seat is guided by the sleeve. A solenoid valve characterized by:

2. 2. The solenoid valve according to claim 1, the valve includes a second end portion, and the sliding portion that does not form the magnetic circuit is disposed on an outer periphery of the second end portion; The sliding portion is composed of a non-magnetic ring that is separate from the stator core. A solenoid valve characterized by:

3. 2. The solenoid valve according to claim 1, the valve includes a second end portion, and the sliding portion is disposed on an outer periphery of the second end portion; The sliding portion is composed of a non-magnetic ring that is separate from the valve. A solenoid valve characterized by:

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