CN110873219A

CN110873219A - Electromagnetic coil and electromagnetic valve

Info

Publication number: CN110873219A
Application number: CN201910745579.7A
Authority: CN
Inventors: 渡边秀刚; 丸山纪郎
Original assignee: Saginomiya Seisakusho Inc
Current assignee: Saginomiya Seisakusho Inc
Priority date: 2018-08-31
Filing date: 2019-08-13
Publication date: 2020-03-10
Anticipated expiration: 2039-08-13
Also published as: CN110873219B; JP7066576B2; JP2020035950A

Abstract

The invention provides a solenoid coil and a solenoid valve, which are easy to assemble a housing (11) of the solenoid coil (10) and a fixing plate (12) instead of fixing by riveting. The housing (11) is configured to integrally include a substrate section (11a) facing the other end face of the molded coil and a pair of side plate sections (11b) extending in the same direction from the facing sides of the substrate section (11 a). A recessed groove (11b1) that is recessed at least from the inner surface to the outside is provided in a portion of the side plate (11b) on the side opposite to the base plate (11 a). The end (12a) of the fixing plate (12) is engaged with the recess (11 b). A convex portion (11b2) is formed on the housing (11) and a concave portion (12b) is formed on the fixing plate (12). The protrusion (11b2) and the recess (12b) restrict relative movement between the housing (11) and the fixed plate (12) in the engagement direction, and serve as a stopper.

Description

Electromagnetic coil and electromagnetic valve

Technical Field

The present invention relates to an electromagnetic coil that operates a plunger or the like in an operating portion of an electromagnetic valve, and an electromagnetic valve including the electromagnetic coil.

Background

Currently, as such an electromagnetic coil, for example, an electromagnetic coil disclosed in japanese patent application laid-open No. 2014-138180 (patent document 1) is known. The conventional electromagnetic coil includes a case and a lower plate (fixing plate) for forming a magnetic circuit on the outside of a molded coil, and the case and the lower plate are fixed by caulking.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open No. 2014-138180

Disclosure of Invention

Problems to be solved by the invention

Since the conventional electromagnetic coil fixes the case and the lower plate by caulking, the assembly process requires labor and time.

The invention provides an electromagnetic coil and an electromagnetic valve, wherein the electromagnetic coil is easy to assemble.

Means for solving the problems

The electromagnetic coil of claim 1 includes: molding a coil; a fixing plate attached to one end surface of the molded coil; and a housing configured from three surfaces covering the other end surface and the side surface of the molded coil, wherein the electromagnetic coil is characterized in that the housing integrally includes: a substrate portion facing the other end surface of the mold coil; and a pair of side plate portions extending in the same direction from the opposite sides of the base plate portion in parallel with the central axis, wherein the pair of side plate portions have concave engaging portions that are recessed from at least the inner surface toward the outer side, the opposite sides of the fixed plate portion have convex engaging portions that engage with the concave engaging portions, the housing and the fixed plate portion have retaining portions that restrict relative movement between the housing and the fixed plate portion in the engaging direction, and the housing is fixed to the fixed plate portion by engaging the pair of concave engaging portions with the convex engaging portions of the fixed plate portion.

The electromagnetic coil of claim 2 is the electromagnetic coil of claim 1, wherein the concave engaging portion of the case is a concave groove parallel to the substrate portion, and the convex engaging portion of the fixing plate is an end portion of the opposing side.

The electromagnetic coil of claim 3 is characterized in that, in the electromagnetic coil of claim 2, the retaining portion is formed of a convex portion formed on one of the concave groove and the end portion of the opposing side, and a concave portion formed on the other.

The electromagnetic coil of claim 4 is characterized in that, in the electromagnetic coil described in claim 3, a tapered surface inclined in a direction away from the parallel concave groove of the case is provided on the same side end portion as the end portion of the opposite side of the fixed plate.

The electromagnetic coil of claim 5 is the electromagnetic coil of claim 4, wherein an angle of an inner angle formed by the pair of side plate portions and the base plate portion is less than 90 ° in a natural state of the case.

The electromagnetic coil of claim 6 is the electromagnetic coil of claim 1, wherein the concave engaging portion of the case is a slit parallel to the substrate portion, and the convex engaging portion of the fixing plate is a convex portion protruding from an end of the opposing side and engaging with the slit.

The solenoid valve of claim 7 is a solenoid valve in which a valve port is opened and closed by a valve member connected to a plunger, and an operating unit for operating the plunger includes the solenoid coil of any one of claims 1 to 6.

The effects of the invention are as follows.

According to the electromagnetic coils of aspects 1 to 6, since the concave engaging portions of the pair of side plate portions of the case are engaged with the convex engaging portions of the fixed plate, and the relative movement of the case and the fixed plate in the engaging direction is restricted by the retaining portions, the case and the fixed plate can be reliably fixed without caulking or the like. Therefore, the assembly can be facilitated.

According to the electromagnetic coil of claim 5, since the angle of the inner angle formed by the pair of side plate portions and the base plate portion is less than 90 ° in the natural state of the case, the gap between the pair of side plate portions of the case and the fixing plate is eliminated by the elastic force of the case with respect to the fixing plate disposed between the pair of side plate portions, and thus the fixing can be reliably performed, and the rattling and the decrease in magnetic efficiency can be prevented.

Drawings

Fig. 1 is a longitudinal sectional view showing a closed state of a solenoid valve according to a first embodiment of the present invention.

Fig. 2 is a view in the direction a of fig. 1.

Fig. 3 is a three-sided view of the housing of the electromagnetic coil of embodiment 1.

Fig. 4 is a two-sided view of a fixing plate of the electromagnetic coil of embodiment 1.

Fig. 5 is a three-sided view of the housing of the electromagnetic coil of embodiment 2.

Fig. 6 is a two-sided view of a fixing plate of an electromagnetic coil according to embodiment 2.

Fig. 7 is a longitudinal sectional view showing a closed state of a solenoid valve according to a second embodiment of the present invention.

Fig. 8 is a three-sided view of the housing of the electromagnetic coil of embodiment 3.

Fig. 9 is a two-sided view of a fixing plate of an electromagnetic coil according to embodiment 3.

Fig. 10 is a diagram showing a modification of the concave engagement portion and the convex engagement portion in each embodiment of the present invention.

Description of the symbols

11-housing, 11 a-base plate portion, 11B-side plate portion, 11B 1-groove (concave engaging portion), 11B 2-protrusion (retaining portion), 12-fixing plate, 12 a-end (convex engaging portion), 12B-recess (retaining portion), 11 ' -housing, 11a ' -base plate portion, 11B ' -side plate portion, 11B1 ' -groove (concave engaging portion), 12 ' -fixing plate, 12a ' -end (convex engaging portion), 12B ' -protrusion (retaining portion), 11 "-housing, 11 a" -base plate portion, 11B "-side plate portion, 11B 1" -slit (concave engaging portion), 12 "-fixing plate, 12 a" -end, 12B "-protrusion (convex engaging portion, retaining portion), 13-molded coil, 14-leaf spring, 10-solenoid, 20-body portion, 20A-joint, 20B-secondary joint, 22-seat, 22 a-main valve port, 25-piston valve, 25 d-pilot port, 30-action part, 31-plunger housing (housing body), 32-plunger, 32 a-pilot valve, 33-suction member, 34-plunger spring.

Detailed Description

Next, an embodiment of the solenoid and the solenoid valve according to the present invention will be described with reference to the drawings. The solenoid valves of the following embodiments are examples of pilot-operated solenoid valves. Fig. 1 is a longitudinal sectional view of the solenoid valve of the first embodiment when no current is supplied thereto, and fig. 2 is a view of the electromagnetic coil of the first embodiment taken along direction a of fig. 1. Note that the concept of "top and bottom" in the following description corresponds to the top and bottom in the drawing of fig. 1. The electromagnetic coil of example 1 and the electromagnetic coil of example 2 are applied to the electromagnetic valve of the first embodiment, but the electromagnetic coil of example 1 is shown in fig. 1. The electromagnetic coil of example 3 is applied to the electromagnetic valve of the second embodiment described below. The solenoid valve of the first embodiment includes a solenoid coil 10, a metallic main body 20, and an operating unit 30 provided above the main body 20.

The electromagnetic coil 10 includes a housing 11, a fixed plate 12, and a molded coil 13, and the fixed plate 12 is integrated with the molded coil 13 by insert molding with a mold resin 13a of the molded coil 13. The molded coil 13 is formed by winding a cylindrical coil 13c around a bobbin 13b and integrally molding the same with a molding resin 13 a. The electromagnetic coil 10 is fixed to the suction piece 33 of the operating portion 30 by the screw N through a screw hole 11c formed in the base plate portion 11a of the housing 11. The housing 11 and the fixing plate 12 are described in detail below.

The main body 20 includes: a high-pressure primary side joint 20A into which a fluid such as a refrigerant flows; a secondary side joint 20B for the fluid to flow out; a bracket part 20C having an axis L orthogonal to the primary side joint 20A and the secondary side joint 20B as a central axis; and a cylinder portion 20D fixed to the bracket portion 20C by screwing. The primary side joint 20A, the secondary side joint 20B, and the bracket 20C are integrally formed, and the cylinder part 20D is coaxially attached to the bracket 20C.

A partition wall 21 is formed between the primary-side joint 20A and the secondary-side joint 20B in the main body portion 20, and a main valve seat 22 is formed on the holder portion 20C side of the partition wall 21. A main valve port 22a having a circular opening is formed in the main valve seat 22, and a valve chamber 23 having a thin circular shape is formed around the main valve seat 22. The cylinder portion 20D extends from the holder portion 20C toward the operating portion 30, a cylindrical guide hole 24 is formed in the cylinder portion 20D, and a piston valve 25 having a substantially cylindrical outer shape is inserted into the guide hole 24. A filter 26 is disposed in the primary-side connector 20A, and the filter 26 is fixed by a plug 27 fitted to an end portion of the primary-side connector 20A.

The piston valve 25 is integrally formed by press-fitting a metal (e.g., brass) piston portion 25a covering the outside and a resin (e.g., PTFE) seal portion 25b disposed inside. The piston valve 25 is disposed to face the main valve port 22a, and an opening spring 25c having a substantially truncated conical shape is disposed in a compressed manner between the bottom of the valve chamber 23 and the piston valve 25. The piston valve 25 is biased in a direction (valve opening direction) away from the main valve seat 22 by the elastic force of the valve opening spring 25 c. When the piston valve 25 is seated on the main valve seat 22, the seal portion 25b closes the main valve port 22 a.

A pilot port 25d and a communication passage 25e are formed in the center of the seal portion 25B, and the pilot port 25d communicates with the secondary side joint 20B via the communication passage 25e and the main valve port 22 a. The periphery of the pilot port 25d serves as a pilot valve seat 25d 1. Further, a gap is provided between the piston valve 25 and the guide hole 24 of the cylinder portion 20D, and the fluid on the primary-side joint 20A side can flow into the rear space of the piston valve 25 through the gap.

The operation unit 30 includes: a cylindrical plunger housing 31 centered on the axis L; a plunger 32 made of a magnetic material and inserted into the plunger housing 31; a suction member 33 made of a magnetic material and fixed to the upper end of the plunger housing 31; and a plunger spring 34 disposed between the plunger 32 and the suction member 33.

The plunger housing 31 is fitted to the cylinder portion 20D coaxially with the guide hole 24, and the periphery of the plunger housing 31 and the end portion of the cylinder portion 20D is fixed by brazing or the like. The plunger 32 is disposed slidably in the direction of the axis L (vertical direction) in the plunger housing 31. A conical pilot valve 32a is formed at the lower end of the plunger 32, and the pilot valve 32a opens and closes the pilot port 25d of the piston valve 25.

With the above configuration, the solenoid valve of the embodiment is provided in the refrigeration cycle, and the high-pressure refrigerant flows into the primary-side joint 20A and flows out from the secondary-side joint 20B. When the electromagnetic coil 10 is not energized (when it is not energized), the state shown in fig. 1 is obtained, and the plunger 32 is positioned away from the suction element 33 by the biasing force of the plunger spring 34 and the weight of the plunger 32. At this time, the pilot valve 32a closes the pilot port 25 d. The piston valve 25 descends together with the pilot valve 32a to close the main valve port 22a, thereby blocking the refrigerant passage. At this time, the rear space of the piston valve 25 becomes high pressure, and the closed state of the piston valve 25 is reliably maintained.

When the electromagnetic coil 10 is energized, a suction force is generated between the suction tool 33 and the plunger 32, the plunger 32 rises, and the pilot valve 32a moves away from the pilot port 25 d. Thereby, the rear space of the piston valve 25 is conducted to the secondary side joint 20B to be low pressure. Thus, the piston valve 25 is separated from the main valve port 22a to be in an open state by a lift force generated by a pressure difference between the rear space of the piston valve 25 and the inside of the primary joint 20A and an elastic force of the valve opening spring 25c, and the refrigerant flows from the primary joint 20A to the secondary joint 20B.

(example 1)

Fig. 3 is a three-side view of a housing 11 of the electromagnetic coil of embodiment 1, and fig. 4 is a two-side view of a fixing plate 12 of the electromagnetic coil of embodiment 1. The case 11 integrally includes a substrate portion 11a facing the other end surface 131 of the mold coil 13, and a pair of

side plate portions

11b, 11b extending in the same direction from the facing sides of the substrate portion 11a in parallel with the central axis L. Further, a recessed groove 11b1, which is a "concave engaging portion", is provided at a portion of the pair of

side plate portions

11b and 11b of the housing 11 opposite to the base plate portion 11a so as to be recessed at least from the inner surface to the outer side. As shown in fig. 3 (B), the recessed groove 11B1 is parallel to the plate surface of the base plate 11a, and the width of the recessed groove 11B1 is slightly larger than the thickness of the fixed plate 12, so that the recessed groove 11B1 of the housing is not pressed into the end portion 12a of the fixed plate 12, and is easily inserted and hardly rattles. The concave groove 11b1 is interrupted at a middle portion of the end portion in the longitudinal direction, and the interrupted portion becomes a convex portion 11b2 as a "stopper portion". As shown in fig. 3a, in the natural state of the housing 11, the angle of the inner angle formed by the pair of

side plates

11b, 11b and the substrate 11a is slightly smaller than 90 ° (less than 90 °).

The opposite ends 12a, 12a of the fixed plate 12 serve as "convex engaging portions" that engage with the concave grooves 11b1 of the housing 11. A concave portion 12b as a "retaining portion" is formed at the

end portions

12a, 12a of the fixed plate 12 at a position corresponding to the convex portion 11b2 of the housing 11, and a tapered surface 12c inclined inward from the

end portions

12a, 12a along an end portion (the same side end portion) in a direction away from the concave portion 12b is formed at a position outward from the concave portion 12 b. That is, the tapered surface 12c is inclined in a direction away from the recess 11b1 described above of the housing 11.

With the above configuration, the housing 11 is fitted to the fixed plate 12 integrated with the mold coil 13. That is, of concave grooves 11b1 and 11b1 of case 11 via projection 11b2, the longer concave groove 11b1 side is fitted into tapered surface 12c of stationary plate 12, and end 12a of stationary plate 12 is fitted into concave groove 11b1 of case 11, and in this state, case 11 is slid with respect to stationary plate 12. The tapered surface 12c of the fixed plate 12 goes over the convex portion 11b2 of the housing 11, and the convex portion 11b2 is fitted into the concave portion 12b of the fixed plate 12.

In this way, the housing 11 is fixed to the fixed plate 12 by engaging the concave grooves 11b1, 11b1 (concave engaging portions) in the pair of

side plate portions

11b, 11b of the housing 11 with the

end portions

12a, 12a (convex engaging portions) of the fixed plate 12. The fitting of the convex portion 11b2 and the concave portion 12b restricts relative movement between the housing 11 and the fixed plate 12 in the engaging direction, thereby preventing the housing from coming off. In addition, since the angle of the inner angle formed by the pair of side plates 11b and the base plate 11a is less than 90 ° in the natural state of the housing 11, the end 12a of the fixed plate 12 is reliably caught in the recess 11b1 of the housing by removing the gap between the pair of side plates 11b of the housing 11 and the fixed plate 12 by the elastic force of the housing 11 in the fixed plate 12 disposed between the pair of

side plates

11b and 11b, and the gap between the pair of side plates 11b of the housing 11 and the fixed plate 12 is removed, thereby preventing rattling and reduction in magnetic efficiency.

(example 2)

Fig. 5 is a three-side view of a case 11 'of an electromagnetic coil according to embodiment 2, and fig. 6 is a two-side view of a fixing plate 12' of the electromagnetic coil according to embodiment 2. Similarly to the case 11 of embodiment 1 shown in fig. 2, the case 11 ' is configured to integrally include a substrate portion 11a ' facing the other end surface 131 of the mold coil 13 and a pair of side plate portions 11b ' and 11b ' extending in the same direction from the facing side of the substrate portion 11a ' in parallel with the central axis L. Further, the pair of side plate portions 11b ', 11b ' of the housing 11 ' have, at portions thereof opposite to the base plate portion 11a ', recessed grooves 11b1 ' which are "concave engaging portions" recessed at least from the inner surface to the outer side. As shown in fig. 5 (B), the recessed groove 11B1 ' is parallel to the plate surface of the base plate 11a ', and the width of the recessed groove 11B1 ' is slightly larger than the thickness of the fixed plate 12 ', so that the recessed groove 11B1 ' of the housing is not pressed into the housing when engaging with the end 12a ' of the fixed plate 12 ', and is easily inserted and hardly shaken. The groove 11b1 'is interrupted at a middle portion of the end portion in the longitudinal direction, and the interrupted portion becomes a recessed portion 11b 2' serving as a "stopper portion". Further, a tapered surface 11b3 'is formed at a position outside the recess 11b 2', and the tapered surface 11b3 'is inclined outward from the grooves 11b 1' and 11b1 'as the end portion in the direction away from the recess 11b 2'. That is, the tapered surface 11b3 'is inclined in a direction away from the fixed plate 12'. As shown in fig. 5a, in a natural state of the housing 11 ', an angle of an inner angle formed between the pair of side plate portions 11 b', 11b 'and the base plate portion 11 a' is slightly smaller than 90 ° (less than 90 °).

The end portions 12a ', 12a ' of the opposite sides of the fixed plate 12 ' are "convex engaging portions" that engage with the concave grooves 11b1 ' of the housing 11 '. In addition, at the end portions 12a ', 12 a' of the fixed plate 12 ', a convex portion 12 b' is formed as a "coming-off preventing portion" at a position corresponding to the concave portion 11b2 'of the housing 11'.

With the above configuration, the housing 11 'is fitted to the fixed plate 12' integrated with the mold coil 13. That is, the tapered surface 11b3 ' side of the housing 11 ' is fitted into the side of the fixed plate 12 opposite to the convex portion 12b ', and the end portion 12a ' of the fixed plate 12 ' is fitted into the concave groove 11b1 ' of the housing 11 ', and in this state, the housing 11 ' is slid with respect to the fixed plate 12 '. The convex portion 12b ' of the fixing plate 12 ' passes over the tapered surface 11b3 ' of the housing 11 ', and the convex portion 12b ' is fitted into the concave portion 11b2 ' of the housing 11 '.

In this way, the housing 11 'is fixed to the fixed plate 12' by engaging the concave grooves 11b1 ', 11b 1' (concave engaging portions) of the pair of side plate portions 11b ', 11 b' of the housing 11 'with the end portions 12 a', 12a '(convex engaging portions) of the fixed plate 12'. Further, the fitting of the concave portion 11b2 'and the convex portion 12 b' restricts relative movement between the housing 11 'and the fixed plate 12' in the engaging direction, thereby achieving the retaining. In addition, since the angle of the inner angle formed by the pair of side plates 11b ', 11 b' and the base plate 11a 'is less than 90 ° in the natural state of the housing 11', the end 12a 'of the fixing plate 12' is reliably caught in the recess 11b1 'of the housing by removing the gap between the pair of side plates 11 b' of the housing 11 'and the fixing plate 12' by the elastic force of the housing 11 'with respect to the fixing plate 12' disposed between the pair of side plates 11b ', and thus the gap between the pair of side plates 11 b' of the housing 11 'and the fixing plate 12' is removed, and rattling and a decrease in magnetic efficiency are prevented.

Fig. 7 is a vertical cross-sectional view of a closed state of the electromagnetic valve according to the second embodiment, and the same elements as those in the first embodiment of fig. 1 are denoted by the same reference numerals as those in fig. 1, and redundant description thereof will be omitted as appropriate. The electromagnetic valve of the second embodiment differs from the electromagnetic valve of the first embodiment in that: the electromagnetic coil 10 "of embodiment 3 described below is applied.

As shown in fig. 7, the electromagnetic coil 10 "of example 3 includes a plate spring 14 between the inner surface of the substrate portion 11 a" of the case 11 "and the molded coil 13. The plate spring 14 biases the mold coil 13 toward the fixed plate 12 ″ in the direction of the axis L with the base plate portion 11a ″ as a fixed side. That is, in the electromagnetic coil 10 of the first embodiment, since both ends of the fixed plate 12 are fitted into the concave grooves 11b1 of the

side plate portions

11b, 11b of the case 11, the fixed plate 12 cannot move in the direction of the axis L. In contrast, in embodiment 3, in the case of only the fixed plate 12 ″ and the housing 11 ″, the fixed plate 12 ″ is offset in the direction of the axis L. Therefore, the plate spring 14 presses the fixed plate 12 "against the inner surface of one side of the recess 11b 2" on the rear side of the slit 11b1 "described below of the side plate portions 11 b", 11b "of the housing 11" through the mold coil 13, thereby fixing the fixed plate 12 "to the side plate portions 11 b", 11b ".

(example 3)

Fig. 8 is a three-sided view of a case 11 "of the electromagnetic coil of embodiment 3, and fig. 9 is a two-sided view of a fixing plate 12" of the electromagnetic coil of embodiment 3. The housing 11 "is integrally formed with a base plate portion 11 a" which is opposed to the other end surface 131 of the molded coil 13 and is pressed against the plate spring 14, and a pair of side plate portions 11b "and 11 b" which are arranged to extend in the same direction from the opposed sides of the base plate portion 11a "in parallel with the central axis L. The pair of side plate portions 11b ″ and 11b ″ of the housing 11 ″ have slits 11b1 "serving as" concave engaging portions "cut from one end surface at portions opposite to the substrate portion 11a ″. The slit 11b1 "is parallel to the plate surface of the base plate 11 a", and the width of the entrance of the slit 11b1 "is slightly larger than the thickness of the fixed plate 12", so that the slit 11b1 "of the housing 11" is not pressed into the end 12a "of the fixed plate 12" when engaged with the end, and is easily inserted and hardly shaken. Further, a recess 11b2 "is formed on the back side of the slit 11b 1" as a "stopper portion". As shown in fig. 8 a, in a natural state of the housing 11 ″, an angle of an inner angle formed between the pair of side plate portions 11b ″ and the base plate portion 11a ″ is slightly smaller than 90 ° (less than 90 °).

In the opposite end portions 12a ", 12 a" of the fixed plate 12 ", and in the vicinity of the same end portion, there are formed convex portions 12 b", 12b "as" convex engaging portions "and" retaining portions ". The convex portions 12b ″ and 12b ″ engage with the concave portion 11b2 ″ on the back side of the slit 11b1 ″ of the housing 11 ″.

With the above configuration, the housing 11 "is fitted to the fixed plate 12" integrated with the mold coil 13. That is, the end portions 12a ", 12 a" of the fixed plate 12 "are fitted between the side plate portions 11 b", 11b "of the housing 11", the housing 11 "is slid with respect to the fixed plate 12", and the slit 11b1 "of the housing 11" is fitted into the convex portion 12b "of the fixed plate 12". The concave portions 11b2 ' and 11b2 ' are fitted into the convex portions 12b ' and 12b ' of the fixed plate 12 '. When fitted, the concave portions 11b2 ", 11b 2" are pushed to the convex portions 12b ", 12 b" in the axis L direction by the urging force of the leaf spring 14 as described above.

The housing 11 "is fixed to the fixed plate 12" by fitting the convex portion 12b "and the concave portion 11b 2" to each other by the urging force of the plate spring 14 in the direction of the axis L, and restricting the relative movement between the housing 11 "and the fixed plate 12" in the engagement direction, thereby preventing the housing 11 "from coming off. In addition, since the angle of the inner angle formed by the pair of side plates 11b ″ and the base plate 11a ″ is less than 90 ° in the natural state of the housing 11 ″, the gap between the pair of side plates 11b ″ of the housing 11 ″ and the fixed plate 12 ″ is eliminated by the elastic force of the housing 11 ″ and the fixed plate 12 ″ disposed between the pair of side plates 11b ″ and 11b ″ can be reliably fixed, and the gap between the pair of side plates 11b ″ of the housing 11 ″ and the fixed plate 12 ″ is eliminated, thereby preventing the rattling and the decrease in magnetic efficiency.

Fig. 10 is a diagram showing a modification of the concave engaging portions in the pair of side plate portions and the convex engaging portions in the fixed plate of the housing. In modification 1 of fig. 10 (a), the plate thickness of the fixed plate 12 is increased, and a protrusion 12c is formed at an end of the fixed plate 12. The protrusion 12c is fitted into the groove 11b1 of the side plate 11b of the housing, and the shoulder portions 12c1 on both sides of the protrusion 12c are brought into contact with the back side of the side plate 11 b. In modification 2 of fig. 10 (B), a protrusion 12c is formed on the fixed plate 12, and a shoulder portion 12c1 on one side of the protrusion 12c is brought into contact with the back side of the side plate portion 11B. Fig. 10 (C) shows the case of example 1, but on the other hand, in modification 3 of fig. 10 (D), the pushed-in portion 11b3 and the bent portion 11b4 are formed in the side plate portion 11b to form the recessed groove 11b 1.

In the first to second embodiments, the surface of the case is not coated, but the surface of the case may be coated or not coated. When the surface of the case is coated, the conventional caulking method is likely to cause cracks and peeling in the coating of the case due to caulking, which may damage the design. However, with the configurations of the first to second embodiments of the present invention, the design of the appearance is not impaired even when the coating is performed.

In the first to second embodiments, the concave grooves and the slits provided in the concave engaging portions of the side plate portions are provided in the portions of the pair of side plate portions of the housing on the side opposite to the substrate portion, but the concave grooves and the slits are not limited to the portions on the side opposite to the substrate portion, and may be provided in the center portion of the side plate portions, the side close to the substrate portion, or the like. In the background art, a lower plate (fixing plate) is described, and the fixing plate is the same as the lower plate of the related art, and in each of the above-described first to second embodiments, the fixing plate is disposed below the mold coil. However, the present invention is not limited to the lower side, and the fixing plate may be disposed on the upper side or the side, and the housing may be disposed on the other three sides.

While the embodiments of the present invention have been described in detail with reference to the drawings, the specific configurations are not limited to these embodiments, and the present invention includes design changes and the like within a range not departing from the gist of the present invention.

Claims

1. An electromagnetic coil is provided with:

molding a coil;

a fixing plate attached to one end surface of the molded coil; and

a case composed of three surfaces covering the other end surface and the side surface of the molded coil,

the above-described electromagnetic coil is characterized in that,

the housing integrally includes: a substrate portion facing the other end surface of the mold coil; and a pair of side plate portions extending in the same direction from the opposite sides of the base plate portion in parallel with the central axis, and having concave engaging portions at least recessed from the inner surface to the outer side at the pair of side plate portions, and having convex engaging portions engaged with the concave engaging portions at the opposite sides of the fixed plate, the housing and the fixed plate having retaining portions for restricting relative movement of the housing and the fixed plate in the engaging direction,

the housing is fixed to the fixed plate by engaging the pair of concave engaging portions with the convex engaging portion of the fixed plate.

2. The electromagnetic coil of claim 1,

the concave engaging portion of the housing is a groove parallel to the substrate portion, and the convex engaging portion of the fixing plate is an end portion of the opposing side.

3. The electromagnetic coil of claim 2,

the retaining portion is formed of a convex portion formed on one of the concave groove and the end portion of the opposing side, and a concave portion formed on the other.

4. The electromagnetic coil of claim 3,

the fixing plate has a tapered surface on the same side end as the end of the opposite side, the tapered surface being inclined in a direction away from the parallel groove of the housing.

5. The electromagnetic coil of claim 4,

in a natural state of the housing, an angle of an inner angle formed by the pair of side plate portions and the substrate portion is less than 90 °.

6. The electromagnetic coil of claim 1,

the concave engaging portion of the housing is a slit parallel to the substrate portion, and the convex engaging portion of the fixing plate is a projection projecting from an end of the opposite side and engaging with the slit.

7. A solenoid valve in which a valve port is opened and closed by a valve member connected to a plunger,

an operating section for operating the plunger includes the electromagnetic coil according to any one of claims 1 to 6.