阅读说明：本技术 电磁阀 (Electromagnetic valve ) 是由 木村贵彦 于 2019-07-09 设计创作，主要内容包括：技术问题：提供一种有助于开闭的结构部件的部件数量较少的电磁阀。解决方案：电磁阀(2)具备：螺线管单元(4),其包含筒状的线圈(10),并在线圈(10)的内周侧形成有流路(12)；阀芯部(20)；板簧部(22),其朝向在螺线管单元(4)的端面中的流路(12)的流动方向的下游侧的端面(14)形成的阀座(16)对阀芯部(20)施力；以及阀壳(8),其收纳螺线管单元(4)、阀芯部(20)以及板簧部(22)。(The electromagnetic valve (2) is provided with a solenoid unit (4) which includes a cylindrical coil (10) and has a flow path (12) formed on the inner peripheral side of the coil (10), a valve body section (20), a leaf spring section (22) which biases the valve body section (20) toward a valve seat (16) formed on the end surface (14) on the downstream side in the flow direction of the flow path (12) in the end surface of the solenoid unit (4), and a valve housing (8) which houses the solenoid unit (4), the valve body section (20), and the leaf spring section (22).)

An electromagnetic valve of types, comprising:

a solenoid unit including a cylindrical coil and having a flow path formed on an inner peripheral side of the coil;

a valve core part;

a plate spring portion that biases the valve body portion toward a valve seat formed on an end surface on a downstream side in a flow direction of the flow passage among end surfaces of the solenoid unit; and

a valve housing that houses the solenoid unit, the valve body portion, and the plate spring portion.

2. The solenoid valve of claim 1,

the valve housing includes a plate spring fixing portion fixing the plate spring portion,

the plate spring fixing portion is provided on an outer side of the coil in a radial direction of the coil.

3. The solenoid valve of claim 2,

the plate spring fixing portion includes an inclined surface inclined so as to increase a distance from the valve seat of the solenoid unit in an axial direction of the coil as the inclined surface faces outward in a radial direction of the coil,

the plate spring portion is fixed to the plate spring fixing portion in a state of being deformed along the inclined surface.

4. The solenoid valve according to any of claims 1-3,

the spool portion and the plate spring portion are formed of different materials from each other.

5. The solenoid valve of claim 4,

the magnetic permeability of the valve core part is greater than that of the plate spring part.

6. The solenoid valve of claim 4,

the valve core portion has a thickness greater than that of the plate spring portion.

7. The solenoid valve of claim 4,

the plate spring portion includes a ring-shaped portion,

the inner diameter of the annular portion is larger than the outer diameter of the valve seat,

the annular portion holds the spool portion on the opposite side of the coil,

the valve seat is provided so as to be capable of abutting against the valve body portion on the inner peripheral side of the annular portion.

8. The solenoid valve according to any of claims 1-3,

the flow path is a flow path through which a coolant of the engine flows,

the solenoid unit includes a cylindrical inner yoke provided on an inner peripheral side of the coil,

the valve seat is formed on an end surface of the inner yoke on a downstream side in the flow direction,

the inner yoke is configured to satisfy S < Q if S is set as the area of the valve seat and Q is set as the sectional area of the inner yoke at the center of the coil in the flow direction.

9. The solenoid valve according to any of claims 1-3,

the valve housing includes at least regulating portions for regulating the amount of movement of the valve body portion at positions on the opposite side of the coil with the valve body portion interposed therebetween.

10. The solenoid valve of claim 9,

the at least restricting portions include a plurality of restricting portions provided at intervals in a circumferential direction of the coil,

each of the regulating portions is provided so as to protrude toward the spool portion,

the top surface of each of the regulating portions is inclined so as to increase a distance d3 from the base end in the axial direction of the coil as a distance d2 from the base end of the plate spring portion in the radial direction of the coil becomes larger,

the top surfaces of the respective restricting portions are disposed in the same plane.

11. The solenoid valve according to any of claims 1-3,

the plate spring portion includes a ring portion and an arm portion extending from the ring portion,

the valve housing includes: an arm receiving portion for receiving the arm portion, and a cylindrical terminal receiving portion for receiving a terminal of the coil,

if the outer end of the arm receiving portion in the radial direction of the coil is set to P1, the sectional center of the terminal receiving portion at the leading end of the terminal receiving portion is set to P2,

an angle θ formed by a line segment L1 connecting an axial center O of the coil and the outer peripheral end P1 and a line segment L2 connecting the axial center O and the cross-sectional center P2 is 90 degrees or less in an axial view of the coil.

Technical Field

The present disclosure relates to solenoid valves.

Background

As a conventional electromagnetic valve, patent document 1 discloses types of electromagnetic valves configured such that a fluid flows on an inner peripheral side of a coil, in which a valve seat is formed on an end surface on a downstream side in a fluid flow direction of the coil, and a valve body is configured such that the valve body is rotatable about a support shaft that partially abuts against a circumferential portion of the valve seat, and the valve body is biased toward the valve seat by a spring.

In this configuration, if the valve body is displaced in the valve opening direction, a position where the separation distance from the valve body to the coil is shortened and a position where the separation distance from the valve body to the coil is lengthened are generated. Since the position where the separation distance is long is present, the flow path area when the valve element is opened can be enlarged as much as possible. Further, if the coil is energized in a state where the valve element is opened, the electromagnetic force generated from the coil accompanying the energization easily reaches a position where the separation distance becomes short on the valve element, and therefore the action of attracting the valve element by the electromagnetic force becomes strong.

Therefore, the valve element can be attracted strongly by the electromagnetic force generated by the coil, as compared with a structure in which the valve element is linearly displaced in the normal direction of the valve seat.

Disclosure of Invention

() problems to be solved

The solenoid valve described in patent document 1 has the following technical problems: a support shaft and a spring for rotatably supporting the valve element are required, and the number of components contributing to opening and closing is increased, which tends to increase the cost.

In view of the above-described problems of the prior art, it is an object of at least embodiments of the present invention to provide types of solenoid valves having fewer components contributing to opening and closing.

(II) technical scheme

(1) An electromagnetic valve according to at least embodiments of the present invention includes a solenoid unit including a cylindrical coil and having a flow path formed on an inner peripheral side of the coil, a valve body, a plate spring portion that biases the valve body toward a valve seat formed on an end surface on a downstream side in a flow direction of the flow path among end surfaces of the solenoid unit, and a valve housing that houses the solenoid unit, the valve body, and the plate spring portion.

(2) In the preferred embodiments, the solenoid valve according to (1) above may be configured such that the valve housing includes a plate spring fixing portion for fixing the plate spring portion, and the plate spring fixing portion may be provided outside the coil in a radial direction of the coil.

(3) In the embodiments, in the solenoid valve described in (2), the plate spring fixing portion may include an inclined surface inclined such that a distance from a valve seat of the solenoid unit in an axial direction of the coil increases toward an outer side in a radial direction of the coil, and the plate spring portion may be fixed to the plate spring fixing portion in a state of being deformed along the inclined surface.

(4) In the embodiments, the electromagnetic valve according to any of (1) to (3) may be configured such that the spool portion and the plate spring portion are made of different materials.

(5) In the embodiments, in the solenoid valve described in (4), the magnetic permeability of the spool portion may be larger than the magnetic permeability of the plate spring portion.

(6) In the embodiments, in the solenoid valve described in (4) or (5), the thickness of the spool portion may be larger than the thickness of the plate spring portion.

(7) In the embodiments, the electromagnetic valve according to any one of of (4) to (6) above, wherein the plate spring portion includes an annular portion having an inner diameter larger than an outer diameter of the valve seat, the annular portion holds the valve body portion on an opposite side of the coil, and the valve seat is provided on an inner peripheral side of the annular portion so as to be capable of abutting against the valve body portion.

(8) In embodiments , the solenoid valve according to any one of items (1) to (7) above, wherein the passage is a passage through which a coolant of the engine flows, the solenoid unit includes a cylindrical inner yoke provided on an inner peripheral side of the coil, the valve seat is formed on an end surface on a downstream side in a flow direction of the inner yoke, and the inner yoke is configured to satisfy S < Q if an area of the valve seat is S and a cross-sectional area of the inner yoke at a central position of the coil in the flow direction is Q.

(9) In the embodiments, the valve housing may include at least regulating portions that regulate an amount of movement of the valve body at positions on an opposite side of the coil with respect to the valve body portion in the electromagnetic valve described in any of (1) to (8) .

(10) In , in the solenoid valve according to the above (9), the at least restricting portions may include a plurality of restricting portions that are provided at intervals in a circumferential direction of the coil, each restricting portion may be provided so as to protrude toward the valve body portion, a top surface of each restricting portion may be inclined so as to increase a distance d3 from a base end of the plate spring portion in an axial direction of the coil as a distance d2 from the base end in a radial direction of the coil becomes larger, and the top surface of each restricting portion may be provided in the same plane as .

(11) In embodiments of the solenoid valve according to any one of (1) to (10) above, wherein the plate spring portion includes an annular portion and an arm portion extending from the annular portion, and the valve housing includes an arm receiving portion for receiving the arm portion and a cylindrical terminal receiving portion for receiving a terminal of the coil, and if an outer end of the arm receiving portion in a radial direction of the coil is P1 and a cross-sectional center of a tip of the terminal receiving portion is P2, an angle θ formed by a line segment L1 connecting an axial center O of the coil and an outer peripheral end P1 and a line segment L2 connecting the axial center O and the cross-sectional center P2 is 90 degrees or less in an axial view of the coil.

(III) advantageous effects

According to at least embodiments of the present invention, solenoid valves are provided with fewer parts of the structural components that facilitate opening and closing.

Drawings

Fig. 1 is a cross-sectional view schematically showing the general structure of an solenoid valve 2 according to an embodiment, and shows a closed valve state of the solenoid valve 2.

Fig. 2 is a cross-sectional view schematically showing the general structure of the solenoid valves 2 according to the embodiment, and shows an open state of the solenoid valves 2.

Fig. 3 is a cross-sectional view schematically showing the general structure of the electromagnetic valve 2 according to the embodiments, and is a view showing a case where the plate spring fixing portion 18 is provided on the end face 14 of the coil 10.

Fig. 4 is a perspective view showing an external shape of an solenoid valve 2 according to an embodiment.

Fig. 5 is an exploded view of the solenoid valve 2 shown in fig. 4.

Fig. 6 is a view showing an angle θ formed by a line segment L1 connecting the axial center O of the coil 10 and the outer peripheral end P1 and a line segment L2 connecting the axial center O and the cross-sectional center P2, when viewed in the axial direction of the coil 10.

Fig. 7 is an exploded view of the reed valve 6.

Fig. 8 is a cross-sectional view of the solenoid valve 2 shown in fig. 4, showing a closed state of the solenoid valve 2.

Fig. 9 is a sectional view of the solenoid valve 2 shown in fig. 4, showing an open state of the solenoid valve 2.

Fig. 10 is an exploded view of the coil unit 30 shown in fig. 8 and 9.

Fig. 11 is an enlarged sectional view of the plate spring fixing portion 18 in the solenoid valve 2 shown in fig. 8.

Fig. 12 is an enlarged cross-sectional view of the vicinity of the abutment portion between the valve seat 16 and the valve body portion 20 in the solenoid valve 2 shown in fig. 8.

Fig. 13 is a diagram showing a relationship between the valve seat area S and the suction force F that draws the reed valve 6 when a current is applied to the coil 10 at high temperature and normal temperature.

FIG. 14 shows Bg²S, S and Bg, respectively, are plotted against the outer diameter of the inner yoke 32.

Fig. 15 is a view showing the cover 26 as viewed in the axial direction of the coil 10.

Fig. 16 is an enlarged sectional view of the plate spring fixing portion 18.

Description of the reference numerals

2-an electromagnetic valve; 4-a solenoid unit; 6-reed valve; 8-valve casing; 10-a coil; 12-a flow path; 14. 15-end face; 16-a valve seat; 18-a leaf spring fixing portion; 20-the valve core part; 22-a leaf spring portion; 32-inner yoke; 52-the annular portion; 60-inclined plane; 76-a restriction; 80-a top surface; 82-base end.

Detailed Description

Although embodiments of the present invention will be described below with reference to the drawings, the dimensions, materials, shapes, relative arrangements, and the like of the constituent members described as the embodiments or shown in the drawings do not limit the scope of the present invention, and are merely illustrative examples.

For example, expressions such as "in a certain direction", "along a certain direction", "parallel", "orthogonal", "central", "concentric" or "coaxial" indicating relative or absolute arrangements do not only indicate a strict arrangement but also indicate a state in which the relative or absolute arrangements are displaced with respect to each other by an angle or distance to the extent that the same function can be obtained, or a tolerance is provided.

For example, expressions such as "same ", "equal", and "homogeneous" indicating that things are equal do not only indicate states that are strictly equal but also indicate states that are different in tolerance or degree of obtaining the same function.

For example, the expression indicating the shape such as a square shape or a cylindrical shape does not only indicate the shape such as a square shape or a cylindrical shape in a strict geometrical sense, but also indicates a shape including a concave and convex portion, a chamfered portion, and the like within a range in which the same effect can be obtained.

In addition, the expression "present", "having", "provided", "including" or "having" constituent elements of is not an exclusive expression that excludes the presence of other constituent elements.

Fig. 1 is a cross-sectional view schematically showing a schematic structure of an -number embodiment of an electromagnetic valve 2, showing a closed state of the electromagnetic valve 2, and fig. 2 shows an opened state of the electromagnetic valve 2 shown in fig. 1, and the application of the electromagnetic valve 2 is not particularly limited, and for example, the electromagnetic valve can be used to open and close a flow path through which a coolant of an engine flows.

In the embodiments, for example, as shown in fig. 1 and 2, the solenoid valve 2 includes a solenoid unit 4, a valve body portion 20, a plate spring portion 22, and a valve housing 8.

The solenoid unit 4 includes a cylindrical coil 10, and a flow path 12 is formed on the inner peripheral side of the coil 10. A valve seat 16 is formed on an end surface 14 on the downstream side in the flow direction J of the flow path 12 among the end surfaces 14, 15 of the solenoid unit 4. Hereinafter, "the downstream side in the flow direction J" is abbreviated as "the downstream side", and "the upstream side in the flow direction J" is abbreviated as "the upstream side".

The plate spring portion 22 is configured to bias the valve body portion 20 toward the valve seat 16. That is, the spool portion 20 and the plate spring portion 22 constitute the leaf valve 6. The valve body 20 is made of a magnetic material, and the valve body 20 is attracted to the valve seat 16 by an electromagnetic force generated when a current is applied to the coil 10. The electromagnetic valve 2 is in a closed state when the valve body 20 is pressed against the valve seat 16 to close the flow passage 12, and is in an open state when the valve body 20 is separated from the valve seat 16 to open the flow passage 12.

The valve housing 8 houses the solenoid unit 4, the valve body portion 20, and the plate spring portion 22.

According to this configuration, since the solenoid valve 2 can be opened and closed by the elastic deformation of the plate spring portion 22, a support shaft for rotatably supporting the valve body is not required as compared with the above-described conventional configuration of patent document 1, the number of components of the components contributing to the opening and closing operation of the solenoid valve 2 can be reduced, and the cost of the solenoid valve 2 can be reduced.

Further, in the conventional structure of patent document 1, since it is necessary to provide a bearing to receive the support shaft that rotatably supports the valve body, there is a possibility that the support shaft and the bearing are fastened due to variation in dimensional accuracy between the support shaft and the bearing, and it is difficult to reliably perform the opening and closing operation of the solenoid valve.

On the other hand, in the solenoid valve 2, since the opening and closing operation of the solenoid valve 2 is performed by the elastic deformation of the plate spring portion 22, the problem of fastening the support shaft to the bearing in patent document 1 does not occur, and the reliability of the opening and closing operation can be improved.

In the embodiments, for example, as shown in fig. 1 and 2, the spool portion 20 and the plate spring portion 22 are made of different materials.

According to this structure, the spring constant of the plate spring portion 22 can be adjusted by the thickness, length, width, material, and the like of the plate spring portion 22, and the attractive force to the coil 10 generated on the spool portion 20 when a current is applied to the coil 10 can be adjusted by the thickness, diameter, material, and the like of the spool portion 20. Therefore, the open state and the closed state of the electromagnetic valve 2 can be switched easily and appropriately.

In the embodiments, for example, in the configuration shown in fig. 1 and 2, the magnetic permeability of the spool portion 20 is greater than the magnetic permeability of the plate spring portion 22.

According to this structure, it is possible to generate a strong attractive force to the coil 10 in the valve body portion 20 of the reed valve 6 when a current is applied to the coil 10 while securing a degree of freedom in design of the material of the plate spring portion 22 for achieving an appropriate spring constant. This facilitates appropriate switching between the open state and the closed state of the electromagnetic valve 2. The material of the valve body 20 and the plate spring 22 is not particularly limited, and the valve body 20 may be made of iron and the plate spring 22 may be made of stainless steel, for example.

In the embodiments, for example, as shown in fig. 2, the valve housing 8 includes a plate spring fixing portion 18 for fixing the plate spring portion 22, and the plate spring fixing portion 18 is provided outside the coil 10 in the radial direction of the coil 10. in the illustrated embodiment, the valve body portion 20 is provided on the end side of the plate spring portion 22, and the other end side of the plate spring portion 22 is fixed to the plate spring fixing portion 18.

According to this configuration, as compared with the case where the plate spring fixing portion 18 is provided on the end surface 14 of the coil 10 (see fig. 3), the spring constant can be reduced by securing the length of the plate spring portion 22, and the valve-open state and the valve-closed state can be appropriately switched.

In the embodiments, for example, as shown in fig. 2, the thickness t1 of the spool portion 20 is larger than the thickness t2 of the plate spring portion 22.

According to this configuration, the appropriate spring constant of the plate spring portion 22 is achieved by making the thickness t2 of the plate spring portion 22 relatively thin, and the strong attractive force to the coil 10 can be generated in the valve body portion 20 of the reed valve 6 when a current is applied to the coil 10 by making the thickness t1 of the valve body portion 20 relatively thick. This facilitates appropriate switching between the open state and the closed state of the electromagnetic valve 2.

The reed valve is used to control the flow of gas, but the above-described reed valve 6 can be preferably used to control the flow of a liquid such as a coolant for an engine because it can generate a strong suction force to the coil 10 in the valve body 20 as described above.

Next, a specific configuration example of the solenoid valve 2 is shown.

Fig. 4 is a perspective view showing the external appearance of an solenoid valve 2 according to an embodiment, fig. 5 is an exploded view of the solenoid valve 2 shown in fig. 4, fig. 6 is a view showing an angle θ formed by a line segment L1 connecting an axial center O of the coil 10 and an outer peripheral end P1 and a line segment L2 connecting the axial center O and a cross-sectional center P2 in an axial view of the coil 10, fig. 7 is an exploded view of the reed valve 6 shown in fig. 5, fig. 8 is a cross-sectional view of the solenoid valve 2 shown in fig. 4 and shows a closed state of the solenoid valve 2, fig. 9 is a cross-sectional view of the solenoid valve 2 shown in fig. 4 and shows an open state of the solenoid valve 2, fig. 10 is an exploded view of the solenoid unit 4 shown in fig. 8 and 9, and a specific configuration example of the solenoid valve 2 to be described below is given the same reference numerals as those given to the structures described using fig. 1 and 2, and description thereof is.

In the embodiments, for example, as shown in fig. 4 and 5, the valve housing 8 includes a cylindrical housing 24 and a cover 26 attached to the housing 24.

For example, as shown in at least of fig. 5 and 7, the plate spring portion 22 of the leaf valve 6 includes an annular portion 52 and arm portions 54 extending from the annular portion 52 in directions, a through hole 55 passing through the coil 10 in the axial direction is formed in the arm portions 54, the annular portion 52 includes a plurality of claw portions 56 provided at intervals in the circumferential direction thereof, and the disk-shaped valve body portion 20 is held by the plurality of claw portions 56, the annular portion 52 includes three claw portions 56 provided at intervals of 120 ° in the circumferential direction thereof, each of the claw portions 56 includes an axially extending portion 86 extending from the outer edge 84 of the annular portion 52 in the thickness direction of the annular portion 52, and a radially extending portion 88 extending from the tip side of the axially extending portion 86 to the inside in the radial direction, the annular portion 52 holds the valve body portion 20 by caulking each of the claw portion 56, and hereinafter, the "axial direction of the coil 10" will be simply referred to as "axial direction".

For example, as shown in fig. 5 and 8, the housing 24 includes: a solenoid unit housing 62 that houses the solenoid unit 4; a spool housing portion 64 that is provided adjacent to the solenoid unit housing portion 62 on the downstream side and that houses the spool portion 20; and an arm housing portion 66 that is provided so as to protrude radially outward from the valve element housing portion 64 and that houses the arm portion 54. The housing 26 is configured to be able to fit into the valve body housing portion 64 and the arm housing portion 66.

For example, as shown in at least of fig. 8 to 10, the solenoid unit 4 includes a coil unit 30 including a cylindrical winding shaft 28 and a coil 10 wound around the winding shaft 28, a cylindrical inner yoke 32 inserted through the winding shaft 28 and provided on the inner peripheral side of the coil 10, and an outer yoke 34 provided on the outer peripheral side of the coil 10, and when a current is applied to the coil 10, the inner yoke 32 and the outer yoke 34 form a magnetic path.

The inner yoke 32 includes a cylindrical portion 36 located on the inner peripheral side of the coil 10, and an annular protrusion 38 protruding radially outward from an upstream end 37 of the cylindrical portion 36, the valve seat 16 of the solenoid unit 4 is formed on the downstream-side end surface 14 of the inner yoke 32 (the downstream-side end surface 14 of the cylindrical portion 36), the annular protrusion 38 is provided so as to face the upstream-side end surface 40 of the coil unit 30, the outer yoke 34 includes an annular portion 44 and a pair of side surface portions , 50, the annular portion 44 is provided so as to face the downstream-side end surface 42 of the coil unit 30, the pair of side surface portions extends upstream from the outer edge 46 of the annular portion 44 and is located on the outer peripheral side of the coil 10, and as shown in fig. 10, the terminal 3570 of the coil 10 is exposed from an opening 68 formed between the side surface portion 48 and the side surface portion 50 in the circumferential direction of the coil 10.

As shown in fig. 4 and 5, the housing 24 of the valve housing 8 includes a tubular terminal housing portion 90, and the terminal housing portion 90 houses the terminal 70 of the coil 10. The terminal housing 90 is provided to protrude radially outward from the solenoid unit housing 62. Here, if the outer end of the arm receiving portion 66 in the radial direction is set to P1 and the sectional center of the terminal receiving portion 90 at the tip 92 of the terminal receiving portion 90 is set to P2, the angle θ formed by a line segment L1 connecting the axial center O of the coil 10 and the outer peripheral end P1 and a line segment L2 connecting the axial center O and the sectional center P2 is 90 degrees or less in the axial view, as shown in fig. 6.

According to this configuration, as shown in fig. 4 and 5, since the arm housing portion 66 and the terminal housing portion 90 that protrude to the outer peripheral side are collectively provided in the valve housing 8, it is possible to obtain various effects of the reed valve 6 described above while suppressing an increase in size of the solenoid valve 2.

Fig. 11 is an enlarged sectional view of the plate spring fixing portion 18 in the solenoid valve 2 shown in fig. 8.

In the embodiments, for example, as shown in fig. 11, the plate spring fixing portion 18 includes a tilted surface 60, the tilted surface 60 being tilted so as to increase a distance d1 in the axial direction from the end surface 58 on the downstream side of the coil 10 toward the outside in the radial direction, and the plate spring portion 22 of the leaf valve 6 is fixed to the plate spring fixing portion 18 in a state of being deformed along the tilted surface 60, and in the illustrated exemplary embodiment, the plate spring fixing portion 18 includes a cylindrical protrusion 72 that protrudes in the axial direction from the tilted surface 60 toward the housing 26 and is inserted into the through hole 55 of the plate spring portion 22, and a cylindrical protrusion 74 that protrudes in the axial direction from the housing 26 toward the housing 24 and into which the tip of the cylindrical protrusion 72 is inserted, and the arm portion 54 of the plate spring portion 22 is fixed by being sandwiched between the tip of the cylindrical protrusion 74 and the tilted surface 60.

According to this configuration, since the plate spring portion 22 of the leaf valve 6 is fixed to the plate spring fixing portion 18 in a state of being deformed along the inclined surface 60, the valve body portion 20 of the leaf valve 6 can be biased toward the valve seat 16 by the elastic force of the plate spring portion 22 of the leaf valve 6.

Fig. 12 is an enlarged cross-sectional view of the vicinity of the abutment portion between the valve seat 16 and the valve body portion 20 in the solenoid valve 2 shown in fig. 8.

In the embodiments, as shown in fig. 12, for example, the annular portion 52 of the plate spring portion 22 holds the valve body portion 20 on the opposite side of the coil 10, and the inner diameter r1 of the annular portion 52 is larger than the outer diameter r2 of the valve seat 16.

According to this configuration, since the annular portion 52 of the plate spring portion 22 holds the valve body portion 20 on the opposite side of the coil 10, a fixing portion (the claw portion 56 in the embodiment shown in fig. 5 and the like) for fixing the valve body portion 20 to the plate spring portion 22 can be provided on the opposite side of the coil 10 with respect to the valve body portion 20. This can avoid interference between the fixing portion and the solenoid unit 4 (e.g., interference between the claw portion 56 and the outer yoke 34 shown in fig. 5). Further, since the inner diameter r1 of the annular portion 52 is larger than the outer diameter r2 of the valve seat 16, the valve body portion 20 can be brought into contact with the valve seat 16 of the solenoid unit 4 on the inner peripheral side of the annular portion 52. In the illustrated embodiment, the inner yoke 32 projects further downstream than the downstream end surface 90 of the outer yoke 34, and therefore the valve body 20 can be brought into contact with the valve seat 16 formed in the inner yoke 32 on the inner circumferential side of the annular portion 52.

As shown in fig. 12, if the area of the valve seat 16 (hereinafter referred to as "valve seat area") is S and the cross-sectional area of the inner yoke 32 at the center position M of the inner yoke 32 in the flow direction J is Q, the inner yoke 32 is configured to satisfy S < Q.

The effects obtained by this configuration will be described with reference to fig. 13 and 14And (5) clearing. Fig. 13 is a diagram showing a relationship between the valve seat area S and the suction force F that draws the reed valve 6 when a current is applied to the coil 10 at high temperature and normal temperature. In addition, if the magnetic flux density of the valve seat 16 is Bg, FIG. 14 shows Bg²S, S and Bg, respectively, are plotted against the outer diameter of the inner yoke 32. In addition, if the magnetic permeability in vacuum is set to μ₀If the attractive force F is F ═ Bg²S)/(2μ₀) And (4) showing.

As shown in fig. 13, the valve seat area S at which the suction force F reaches a peak at high temperature is smaller than the valve seat area S at which the suction force F reaches a peak at normal temperature. Further, if compared with the case of normal temperature, the suction force F at high temperature is reduced. In the case where the solenoid valve 2 is used to control the flow of the coolant of the engine, the solenoid valve 2 is basically used in a high-temperature environment. Therefore, in this case, it is preferable that the valve seat area S is smaller than the valve seat area S where the suction force F reaches the peak at normal temperature. Further, it is more preferable to use the valve seat area S such that the suction force F reaches the vicinity of the peak at high temperature. This makes it possible to stably obtain a large attractive force F (an attractive force F larger than a required load is easily obtained).

The magnetic flux density Bg is determined by the cross-sectional area Q of the inner yoke 32, and the larger the cross-sectional area Q, the larger the magnetic flux density Bg. Therefore, by making the valve seat area S smaller than the cross-sectional area Q of the inner yoke 32, a larger attractive force F can be obtained at high temperatures without lowering the magnetic flux density Bg.

In the region shown in fig. 14, the smaller the outer diameter of the inner yoke 32, the smaller the valve seat area S, and the larger the square of the magnetic flux density Bg. Here, when the outer diameter of the inner yoke 32 is reduced, the influence of the increased square of the magnetic flux density Bg is greater than the influence of the reduced valve seat area S, and therefore the attractive force F also increases. Therefore, as shown in fig. 13, a region in which the attraction force F increases as the valve seat area S decreases is generated.

Fig. 15 is a view showing the housing 26 as viewed in the axial direction. Fig. 16 is an enlarged sectional view of the plate spring fixing portion 18.

As shown in fig. 15 and at least of fig. 16, the case 26 includes at least restricting portions 76 that restrict the amount of movement of the spool portion 20 at positions on the opposite side of the coil 10 across the spool portion 20, in the illustrated exemplary embodiment, the case 26 includes a plurality of restricting portions 76 that are provided at intervals along the circumferential direction of the coil 10, each restricting portion 76 is provided so as to protrude toward the spool portion 20 from a surface 78 of the case 26 that faces the spool portion 20 (a surface on the inner side of the case 26), as shown in fig. 16, a top surface 80 of each restricting portion 76 is inclined so as to increase a distance d3 in the axial direction from a base end 82 (a base end of the arm portion 54) of the plate spring portion 22 as a distance d2 in the radial direction from the base end 82 increases, and a top surface 80 of each restricting portion 76 is provided in the same plane as .

According to this configuration, since the regulating portion 76 for regulating the amount of deformation of the reed valve 6 is provided at a position on the opposite side of the coil 10 with the reed valve 6 interposed therebetween, the flow rate of the solenoid valve 2 in the valve-opened state can be appropriately controlled.

Further, since the respective top surfaces 80 are inclined so as to increase the distance d3 in the axial direction from the base end 82 of the reed valve 6 as the distance d2 in the radial direction from the base end 82 increases, and the respective top surfaces 80 are provided in the same plane U, the valve body portion 20 in the open valve state can be stably supported by the plurality of top surfaces 80 provided in the same plane U, and thereby the flow rate of the electromagnetic valve 2 in the open valve state can be appropriately controlled.

The present invention is not limited to the above-described embodiments, and includes embodiments in which modifications are made to the above-described embodiments, and embodiments in which these embodiments are appropriately combined.

For example, although the above-described embodiments illustrate reed valves in which the valve body and the leaf spring portion are made of different materials, in other embodiments, the valve body and the leaf spring portion may be integrally made of the same material .

In the embodiments, the annular portion of the plate spring portion is configured to hold the valve body portion on the opposite side of the coil, but in other embodiments, the plate spring may hold the valve body portion on the coil side.