Motorised valve

Abstract

Provided is an electric valve and an assembling method of an electric valve capable of reducing the number of processes for fixing a housing that houses a stator to a valve main body. An electric valve (1) has a valve main body (10) having a main body portion (11), a stator (60) of a cylindrical shape, a housing (28) of a cylindrical shape engaged with the valve main body (10) and coaxially arranged inside the stator (60), and a housing (70) that houses the stator (60). The main body portion (11) has a holding groove (21). The housing (70) has a mounting plate (82) arranged inside the holding groove (21). The holding groove (21) has an opening (21k) at an end portion on the housing (70) side. The mounting plate (82) is engaged with the main body portion (11) to restrict movement of the mounting plate (82) toward the opening (21k).

Description

Technical Field

[0001] This invention relates to an electric valve and a method for assembling the electric valve. Background Technology

[0002] Patent Document 1 discloses an example of a conventional electric valve. The electric valve of Patent Document 1 has a valve body with a valve chamber. A valve core is disposed in the valve chamber. A cylindrical housing is joined to the valve body. The electric valve has a magnetic rotor and a stator. The magnetic rotor and stator constitute a stepper motor. The magnetic rotor is disposed inside the housing. The stator is disposed outside the housing. The stator is housed in a casing. The casing is fixed to the valve body by screws.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2018-173102

[0006] The technical problem that the invention aims to solve

[0007] However, the assembly of the aforementioned electric valve requires a process to secure the housing to the valve body using screws. Therefore, this electric valve presents a problem of increased manufacturing costs. Summary of the Invention

[0008] Therefore, the object of the present invention is to provide an electric valve and an assembly method for the electric valve that can reduce the steps required for fixing the housing housing the stator to the valve body.

[0009] Technical means for solving technical problems

[0010] To achieve the above objectives, one aspect of the present invention provides an electric valve comprising: a valve body, a cylindrical stator, a cylindrical housing coaxially disposed inside the stator and engaging with the valve body, and a shell housed within the stator, wherein one of the valve body and the shell is a first component and the other is a second component, the first component having a cutout, the second component having an anti-rotation portion disposed inside the cutout, the cutout having an opening at its end on the second component side, and the anti-rotation portion engaging with the first component to restrict movement of the anti-rotation portion toward the opening.

[0011] According to the present invention, during the assembly of the electric valve, when the housing is inserted into the inside of the stator, the anti-rotation part is inserted into the inside of the cutout through the opening. By arranging the anti-rotation part inside the cutout, the rotation of the housing relative to the valve body about the axis of the housing is restricted. By the engagement of the anti-rotation part of the second component with the first component, the movement of the housing away from the valve body is restricted. Therefore, the housing can be fixed to the valve body without the use of screws. Thus, the steps for fixing the housing to the valve body can be reduced.

[0012] In this invention, preferably, the valve body is the first component, having a retaining groove as the cutout, and the housing is the second component, having a mounting plate as the anti-rotation portion, the mounting plate extending along the axis of the housing toward the valve body. In this way, the mounting plate engages with the valve body within the retaining groove, restricting movement of the housing away from the valve body. Therefore, the housing can be fixed to the valve body without the use of screws. Thus, the steps for fixing the housing to the valve body can be reduced.

[0013] In this invention, preferably, the valve body has a recess, and the mounting plate has a protrusion that engages with the recess. This allows the housing to be secured to the valve body using a simple structure.

[0014] In this invention, preferably, the mounting plate elastically deforms when the protrusion contacts the inner surface of the retaining groove, and returns to its original shape when the protrusion engages with the recess. Thus, during the assembly of the electric valve, when the housing is inserted into the inside of the stator, the mounting plate is inserted into the inside of the retaining groove through the opening of the retaining groove and moves in the insertion direction within the retaining groove. When the protrusion contacts the inner surface of the retaining groove, the mounting plate elastically deforms, and when the protrusion engages with the recess, the mounting plate returns to its original shape. Therefore, the steps for fixing the housing to the valve body can be further reduced.

[0015] In this invention, preferably, the valve body has a protrusion, and the mounting plate has a recess that engages with the protrusion. This allows the housing to be fixed to the valve body using a simple structure.

[0016] In this invention, preferably, except when the protrusion engages with the recess, the mounting plate elastically deforms when it contacts the protrusion, and returns to its original shape when the protrusion engages with the recess. In this way, during the assembly of the electric valve, when the housing is inserted into the inside of the stator, the mounting plate is inserted into the inside of the retaining groove through the opening of the retaining groove and moves in the insertion direction within the retaining groove. When the mounting plate contacts the protrusion, it elastically deforms; when the protrusion engages with the recess, it returns to its original shape. Therefore, the steps for fixing the housing to the valve body can be further reduced.

[0017] In this invention, preferably, the mounting plate has claw portions, and the valve body has claw receiving portions for engaging the claw portions. This allows the housing to be secured to the valve body using a simple structure.

[0018] In this invention, preferably, the mounting plate elastically deforms when the claw contacts the inner surface of the retaining groove, and returns to its original shape when the claw engages with the claw bearing portion. In this way, during the assembly of the electric valve, when the housing is inserted into the inside of the stator, the mounting plate is inserted into the inside of the retaining groove through the opening of the retaining groove and moves in the insertion direction within the retaining groove. When the claw contacts the inner surface of the retaining groove, the mounting plate elastically deforms, and returns to its original shape when the claw engages with the claw bearing portion. Therefore, the steps for fixing the housing to the valve body can be further reduced.

[0019] In this invention, preferably, the valve body has a claw portion, and the mounting plate has a claw receiving portion for engaging the claw portion. This allows the housing to be fixed to the valve body using a simple structure.

[0020] In this invention, preferably, except when the claw engages with the claw receiving portion, the mounting plate elastically deforms when it contacts the claw, and returns to its original shape when the claw engages with the claw receiving portion. In this way, during the assembly of the electric valve, when the housing is inserted into the inside of the stator, the mounting plate is inserted into the inside of the retaining groove through the opening of the retaining groove and moves in the insertion direction within the retaining groove. When the mounting plate contacts the claw, it elastically deforms, and when the claw engages with the claw receiving portion, it returns to its original shape. Therefore, the steps for fixing the housing to the valve body can be further reduced.

[0021] In this invention, it is preferable that the width of the mounting plate is the same as the width of the retaining groove. This allows for more effective restriction of the housing's rotation relative to the valve body about the housing's axis.

[0022] In this invention, it is preferable that the mounting plate is pressed into the retaining groove. This allows the housing to be secured to the valve body using a simple structure.

[0023] In this invention, it is preferred that the mounting plate has at least one barb formed to wed into the valve body. This allows for a more reliable fixation of the housing to the valve body.

[0024] In this invention, preferably, the outer casing has a main body made of synthetic resin and a metal bracket fixed to the main body. The bracket has a bracket body in the shape of a circular plate and a mounting plate continuously disposed along the inner periphery of the bracket body. This design saves on the metal plate material used for the bracket compared to a structure where the mounting plate is continuously disposed along the outer periphery of the bracket body.

[0025] A method for assembling an electric valve, the electric valve comprising: a valve body, a cylindrical stator, a cylindrical housing that engages with the valve body and is coaxially inserted into the inner side of the stator, and a housing that houses the stator, wherein one of the valve body and the housing is a first component and the other is a second component, the first component having a cutout, and the second component having an anti-rotation portion disposed inside the cutout, the cutout having an opening at its end on the second component side, such that the valve body, with the housing engaged, approaches the housing containing the stator along the axis of the housing, the housing is inserted into the inner side of the stator, and the anti-rotation portion is inserted through the opening into the cutout, such that the anti-rotation portion engages with the first component to restrict movement of the anti-rotation portion toward the opening. In this way, the housing can be fixed to the valve body without the use of screws. Therefore, the steps for fixing the housing to the valve body can be reduced.

[0026] An electric valve includes: a valve body; a cylindrical housing that engages with the valve body; a cylindrical stator into which the housing is inserted; and a casing housing the stator. The casing has a mounting plate extending along an axis of the housing, and the valve body has a retaining groove into which the mounting plate is inserted along the axis. The mounting plate and the retaining groove are configured to restrict movement of the mounting plate within the retaining groove in a direction opposite to the insertion direction.

[0027] The cylindrical housing of the electric valve, which engages with the valve body, is inserted into the inside of the stator along its axis. The housing housing, which houses the stator, has a mounting plate extending along its axis. The valve body has a retaining groove into which the mounting plate is inserted along the axis. Furthermore, the mounting plate and retaining groove are configured to restrict movement of the mounting plate within the retaining groove in the direction opposite to the insertion direction. This restricts movement of the mounting plate and retaining groove in the direction away from the valve body (opposite to the insertion direction). Therefore, the housing can be fixed to the valve body without the use of screws. Consequently, the steps required to fix the housing to the valve body are reduced.

[0028] Preferably, one of the valve body and the mounting plate of the electric valve has a recess, and the other of the valve body and the mounting plate has a protrusion that engages with the recess. This allows the housing to be secured to the valve body using a simple structure.

[0029] Preferably, the electric valve is configured such that when the mounting plate moves in the retaining groove in the insertion direction, the mounting plate elastically deforms, and the recess and the protrusion engage with each other. In this way, during the process of inserting the housing into the stator, the mounting plate is inserted into the retaining groove and moves in the insertion direction within the retaining groove. Then, the mounting plate elastically deforms, and the recess and the protrusion engage with each other. Therefore, the steps for fixing the housing to the valve body can be further reduced.

[0030] Preferably, one of the valve body and the mounting plate of the electric valve has a claw portion, and the other of the valve body and the mounting plate has a claw receiving portion for engaging the claw portion. This allows the housing to be secured to the valve body with a simple structure.

[0031] Preferably, the electric valve is configured such that when the mounting plate moves in the retaining groove in the insertion direction, the mounting plate elastically deforms, and the claw portion engages with the claw receiving portion. In this way, during the process of inserting the housing into the stator, the mounting plate is inserted into the retaining groove and moves in the insertion direction within the retaining groove. Then, the mounting plate elastically deforms, and the claw portion engages with the claw receiving portion. Therefore, the steps for fixing the housing to the valve body can be further reduced.

[0032] Preferably, the width of the mounting plate of the electric valve is the same as the width of the retaining groove. This restricts the rotation of the housing relative to the valve body about the housing axis.

[0033] Preferably, the mounting plate of the electric valve is pressed into the retaining groove. In this way, the housing can be fixed to the valve body with a simple structure.

[0034] Preferably, the mounting plate of the electric valve has one or more barbs formed to wed into the valve body. This allows for a more reliable fixation of the housing to the valve body.

[0035] Preferably, the housing of the electric valve has a housing body made of synthetic resin and a metal bracket fixed to the housing body. The bracket has a bracket body in the shape of a circular plate formed by stamping and a mounting plate continuously disposed along the inner periphery of the bracket body. In this way, compared to a structure in which the mounting plate is continuously disposed along the outer periphery of the bracket body, the metal plate used as the bracket material can be saved.

[0036] The assembly method of the electric valve is as follows: the electric valve has: a valve body; a cylindrical housing that engages with the valve body; a cylindrical stator into which the housing is inserted; and a housing that accommodates the stator. The housing has a mounting plate extending along an axis of the housing, and the valve body has a retaining groove into which the mounting plate is inserted along the axis. In the assembly method of the electric valve, the housing is brought close together along the axis, the housing is inserted into the inside of the stator, and the mounting plate is inserted into the retaining groove, such that the mounting plate is held in the retaining groove in a manner that restricts movement of the mounting plate within the retaining groove in a direction opposite to the insertion direction.

[0037] In the assembly method of the electric valve, the housing, which is joined to the valve body, is brought close to the outer casing housing the stator along the axis of the housing. The outer casing is inserted into the inner side of the stator, and the mounting plate is inserted into the retaining groove. Then, the mounting plate is held in the retaining groove in a manner that restricts its movement within the retaining groove in the direction opposite to the insertion direction. In this way, the outer casing can be fixed to the valve body without the use of screws. Therefore, the steps for fixing the outer casing to the valve body can be reduced.

[0038] Invention Effects

[0039] According to the present invention, the steps for fixing the housing containing the stator to the valve body can be reduced. Attached Figure Description

[0040] Figure 1 This is a front view of an electric valve representing an embodiment of the present invention.

[0041] Figure 2 It is along Figure 1 A sectional view along line II-II.

[0042] Figure 3 It means Figure 1 A diagram showing the bracket on the housing of the electric valve.

[0043] Figure 4 It means Figure 1 A diagram showing the fixed structure of the valve body and housing of an electric valve.

[0044] Figure 5 It means Figure 4 A diagram of the structure of the first modified example of the fixed structure.

[0045] Figure 6 It means Figure 4 A diagram of the structure of the second variation of the fixed structure.

[0046] Figure 7 It means Figure 4The diagram shows the structure of the third variation of the fixed structure.

[0047] Figure 8 It means Figure 4 The diagram shows the structure of the fourth variation of the fixed structure.

[0048] Figure 9 It means Figure 4 The diagram shows the structure of the fifth variation of the fixed structure.

[0049] Figure 10 It means Figure 1 A cross-sectional view of the structure of a modified example of an electric valve. Detailed Implementation

[0050] The following is for reference Figures 1-4 An electric valve according to an embodiment of the present invention is described.

[0051] Figure 1 This is a front view of an electric valve according to an embodiment of the present invention. Figure 2 It is along Figure 1 A sectional view along line II-II. Figure 2 Also along Figure 1 A sectional view (longitudinal view) of the axis of the electric valve. Figure 3 It means Figure 1 A diagram showing the bracket on the housing of the electric valve. Figure 3 (A) is a three-dimensional view of the bracket viewed from above. Figure 3 (B) is a three-dimensional view of the bracket viewed from below. Figure 4 It means Figure 1 A diagram showing the fixed structure of the valve body and housing of an electric valve. Figure 4 (A) is an enlarged view of the mounting plate and its vicinity from the rear side of the housing. Figure 4 (B) is along Figure 4 A sectional view of the IVB-IVB line in (A). Figure 4 (C) is a cross-sectional view showing the state of the mounting plate after elastic deformation.

[0052] like Figure 1 , Figure 2 As shown, the electric valve 1 has a valve body 10, a housing 28, a drive mechanism 30, a valve core 40, and a stator unit 50.

[0053] The valve body 10 is made of a metal such as aluminum alloy. The valve body 10 has a main body portion 11, a cylindrical portion 12, and a flange portion 13. The main body portion 11 has a cuboid shape. The cylindrical portion 12 protrudes from the upper surface 11a of the main body portion 11. The cylindrical portion 12 is threaded onto the main body portion 11. A valve chamber 14 and flow paths 15 and 16 are provided in the main body portion 11. Flow path 15 is connected to the valve chamber 14. Flow path 16 is connected to the valve chamber 14 via a port 17. The flange portion 13 has an annular plate shape. The inner periphery of the flange portion 13 engages with the upper end of the cylindrical portion 12. In this embodiment, the valve body 10 is the first component.

[0054] A retaining groove 21 is provided on the back side of the main body 11. The retaining groove 21 is formed to extend downward from the upper surface 11a. The retaining groove 21 extends in the vertical direction (axis L direction). A recess 21b is provided on the bottom surface 21a of the retaining groove 21, which extends from the back side to the front side. Figure 2 A circular hole extending from right to left in the middle.

[0055] The retaining groove 21 is a cutout in the valve body 10. The upper end of the retaining groove 21 has no wall surface and opens in the extending direction of the retaining groove 21. That is, the retaining groove 21 has an opening 21k at its upper end.

[0056] The housing 28 is made of a metal such as stainless steel. The housing 28 has a cylindrical shape with its upper end blocked. The lower end of the housing 28 is engaged with the outer periphery of the flange portion 13. Figure 2 The axis L passes through the central axis of the housing 28.

[0057] The drive mechanism 30 moves the valve core 40 in the vertical direction. The drive mechanism 30 has a magnetic rotor 31, a valve shaft retainer 32, a guide bushing 33, and a valve shaft 34.

[0058] The magnetic rotor 31 has a cylindrical shape. The magnetic rotor 31 is disposed inside the housing 28. The outer diameter of the magnetic rotor 31 is slightly smaller than the inner diameter of the housing 28. Multiple N poles and multiple S poles are provided on the outer circumferential surface of the magnetic rotor 31. The multiple N poles and multiple S poles extend vertically and are equally spaced and alternately arranged circumferentially. In this embodiment, the magnetic rotor 31 has 12 N poles and 12 S poles.

[0059] The valve shaft retainer 32 has a cylindrical shape with its upper end blocked. A support ring 35 is fixed to the upper end of the valve shaft retainer 32. The magnetic rotor 31 and the valve shaft retainer 32 are integrated via the support ring 35. An internal thread 32c is provided on the inner circumferential surface of the valve shaft retainer 32.

[0060] The guide bushing 33 integrally comprises a first cylindrical portion 33a and a second cylindrical portion 33b. The outer diameter of the second cylindrical portion 33b is smaller than the outer diameter of the first cylindrical portion 33a. The second cylindrical portion 33b is coaxially connected to the upper end of the first cylindrical portion 33a. An external thread 33c is provided on the outer circumferential surface of the second cylindrical portion 33b. The external thread 33c engages with the internal thread 32c of the valve shaft retainer 32. The first cylindrical portion 33a is pressed into a fitting hole 12a provided in the cylindrical portion 12 of the valve body 10. The guide bushing 33 is then engaged with the valve body 10.

[0061] The valve shaft 34 is cylindrical. The upper end 34a of the valve shaft 34 passes through the valve shaft retainer 32. A push nut 36 for preventing disengagement is installed at the upper end 34a of the valve shaft 34. The valve shaft 34 is inserted into the guide bushing 33 and the cylindrical portion 12. The lower end of the valve shaft 34 is disposed in the valve chamber 14. The valve shaft 34 has an upward-facing annular plane, i.e., a stepped portion 34b. A valve-closing spring 37 is disposed between the valve shaft retainer 32 and the stepped portion 34b. The valve-closing spring 37 is a compression coil spring. The valve-closing spring 37 pushes the valve shaft 34 downwards.

[0062] The valve core 40 is integrally mounted on the lower end of the valve shaft 34. The valve core 40 is disposed in the valve chamber 14. The valve core 40 is moved vertically by the drive mechanism 30. The movement of the valve core 40 opens and closes the port 17.

[0063] The stator unit 50 has a stator 60 and a housing 70.

[0064] The stator 60 has a cylindrical shape. The stator 60 is disposed on the outside of the housing 28. The stator 60 and the magnetic rotor 31 together constitute a stepper motor. The stator 60 has an upper stator 61, a lower stator 62, and a molded part 63 made of synthetic resin.

[0065] The upper stator 61 is coaxially disposed above the lower stator 62. Both the upper stator 61 and the lower stator 62 have a plurality of claw-shaped pole teeth arranged at equal intervals in the circumferential direction. A molded part 63 is filled within the upper stator 61 and the lower stator 62. The molded part 63 forms the inner circumferential surface of the stator 60. The molded part 63 has a terminal support portion 64.

[0066] In this embodiment, the upper stator 61 has 24 pole teeth, the lower stator 62 has 24 pole teeth, and the stator 60 has a total of 48 pole teeth. The lower stator 62 is positioned such that the position of the pole teeth of the upper stator 61 and the lower stator 62, arranged vertically, is rotated relative to the upper stator 61 about axis L by half an angle between the pole teeth ((360 / 24) / 2 = 7.5 degrees). When 96 pulses are input to the stator 60, the magnetic rotor 31 rotates one revolution. The rotation angle (step angle) of the magnetic rotor 31 for each pulse is 3.75 degrees.

[0067] Terminal support portion 64 extends laterally from upper stator 61 and lower stator 62. Terminal support portion 64 supports a plurality of terminals 65. The plurality of terminals 65 protrude laterally from the top end of terminal support portion 64. The plurality of terminals 65 are connected to coils of upper stator 61 and lower stator 62.

[0068] The housing 70 has a housing body 71 and a bracket 80. In this embodiment, the housing 70 is a second component.

[0069] The outer casing 71 is made of synthetic resin. The outer casing 71 houses the stator 60. The outer casing 71 integrally has a peripheral wall portion 72, an upper wall portion 73, a dome portion 74, a cylindrical portion 75, and a connector portion 76.

[0070] The peripheral wall portion 72 has a cylindrical shape. The upper wall portion 73 is continuously disposed at the upper end of the peripheral wall portion 72. The dome 74 protrudes upward from the center of the upper wall portion 73. The housing 28 is inserted into the stator 60 and the dome 74. The cylindrical portion 75 has a cylindrical shape with a smaller diameter than the peripheral wall portion 72. The cylindrical portion 75 protrudes downward from the peripheral wall portion 72. The cylindrical portion 75 is configured to surround the cylindrical portion 12 of the valve body 10. An annular closure member 90 is disposed between the cylindrical portion 75 and the cylindrical portion 12. The closure member 90 is made of an elastic material such as rubber. The connector portion 76 has an elliptical cylindrical shape. The connector portion 76 extends laterally from the peripheral wall portion 72. A terminal support portion 64 and a plurality of terminals 65 are disposed inside the connector portion 76.

[0071] The bracket 80 is made of metal. (For example...) Figure 3 As shown, the bracket 80 integrally comprises a bracket body 81 and a mounting plate 82. The bracket body 81 has an annular plate shape. The bracket body 81 is fixed to the lower end of the peripheral wall 72 of the housing body 71. The mounting plate 82 has a rectangular plate shape. The mounting plate 82 is continuously disposed with the inner periphery of the bracket body 81 and extends downward. The mounting plate 82 extends toward the valve body 10. The bracket 80 is formed by stamping a metal sheet into the shape of the bracket body 81 and the mounting plate 82, and bending the mounting plate 82 along the central axis (axis L) of the bracket body 81. The bracket 80 may also be welded to the stator 60.

[0072] Width of mounting plate 82 ( Figure 4The width of the mounting plate 82 (in the left-right direction) is the same as the width of the retaining groove 21 of the main body 11. The width of the mounting plate 82 may also be smaller than the width of the retaining groove 21. The deviation angle of the valve body 10 and the housing 70 about the axis L caused by the difference between the width of the mounting plate 82 and the width of the retaining groove 21 is preferably smaller than the step angle of the stepper motor described above. The mounting plate 82 extends in the vertical direction. The mounting plate 82 is inserted into the retaining groove 21 from the upper surface 11a side of the main body 11 downward. The mounting plate 82 is inserted into the retaining groove 21 through the opening 21k at the upper end of the retaining groove 21. The housing 70 is disposed above the valve body 10, and the upper end of the retaining groove 21 is the end of the retaining groove 21 on the housing 70 side (second component side). The mounting plate 82 is held in the retaining groove 21. The mounting plate 82 is an anti-rotation part of the housing 70.

[0073] The mounting plate 82 has a protrusion 82a. The protrusion 82a protrudes from the back side to the front side. The protrusion 82a is inserted into the recess 21b of the main body 11. By inserting the protrusion 82a into the recess 21b, the recess 21b and the protrusion 82a hook (i.e., engage) with each other, restricting the movement of the mounting plate 82 within the retaining groove 21 toward the opening 21k (upward). Thus, the housing 70 is fixed to the valve body 10.

[0074] In the electric valve 1, the central axis of each of the following components of the valve body 10—cylindrical portion 12, port 17, housing 28, magnetic rotor 31, valve shaft retainer 32, guide bushing 33, valve shaft 34, valve core 40, stator 60, and housing 70 (round top 74, cylindrical portion 75, bracket body 81)—is aligned with axis L.

[0075] Next, the operation of electric valve 1 will be explained.

[0076] In the electric valve 1, energizing the upper stator 61 and the lower stator 62 causes the magnetic rotor 31 to rotate in one direction. Through the threaded feed action of the internal thread 32c of the valve shaft holder 32 and the external thread 33c of the guide bushing 33, the valve shaft holder 32 moves downward. The valve shaft 34 also moves downward together with the valve shaft holder 32, and the valve core 40 closes port 17 (valve closed state).

[0077] In the electric valve 1, energizing the upper stator 61 and lower stator 62 causes the magnetic rotor 31 to rotate in the opposite direction. The valve shaft holder 32 rotates together with the magnetic rotor 31. Through the threaded feed action of the internal thread 32c of the valve shaft holder 32 and the external thread 33c of the guide bushing 33, the valve shaft holder 32 moves upward. The valve shaft 34 also moves upward together with the valve shaft holder 32, and the valve core 40 opens port 17 (open valve state).

[0078] Next, an example of an assembly method for fixing the housing 70 to the valve body 10 will be described.

[0079] The housing 28, which is joined to the valve body 10, is brought close to the outer casing 70, which houses the stator 60, along the axis L. The housing 28 is inserted into the inner side of the stator 60 and the dome 74. Simultaneously, the mounting plate 82 of the outer casing 70 is inserted downwards from the upper surface 11a side into the retaining groove 21 of the valve body 10. The insertion direction of the mounting plate 82 into the retaining groove 21 is shown below. The mounting plate 82 is inserted into the retaining groove 21 through the opening 21k. Then, if the mounting plate 82 is inserted into the retaining groove 21, it proceeds as follows... Figure 4 As shown in (C), the protrusion 82a of the mounting plate 82 ascends onto the bottom surface 21a of the retaining groove 21, and the mounting plate 82 elastically deforms in a bending manner. Then, if further insertion is performed, the mounting plate 82 returns to its original position, as shown in (C). Figure 4 (A) Figure 4 As shown in (B), the protrusion 82a is embedded in the recess 21b of the retaining groove 21. Thus, the recess 21b and the protrusion 82a hook together, holding the mounting plate 82 within the retaining groove 21 in a manner that restricts upward movement (towards the opening 21k) within the retaining groove 21. Furthermore, the width of the retaining groove 21 is the same as the width of the mounting plate 82, thereby restricting the housing 70 from rotating about the axis L relative to the valve body 10. In this way, the housing 70 is fixed to the valve body 10.

[0080] As described above, the electric valve 1 of this embodiment includes: a valve body 10, a cylindrical stator 60, a cylindrical housing 28 that engages with the valve body 10 and is disposed inside the stator 60, and a housing 70 that houses the stator 60. The valve body 10 has a retaining groove 21. The housing 70 has a mounting plate 82 disposed inside the retaining groove 21. The retaining groove 21 has an opening 21k at its upper end. Furthermore, the mounting plate 82 engages with the valve body 10 to restrict movement of the mounting plate 82 toward the opening 21k.

[0081] Therefore, during the assembly of the electric valve 1, when the housing 28 is inserted into the inside of the stator 60, the mounting plate 82 is inserted into the inside of the retaining groove 21 through the opening 21k of the retaining groove 21. By arranging the mounting plate 82 inside the retaining groove 21, the rotation of the housing 70 relative to the valve body 10 about the axis L is restricted. By engaging the mounting plate 82 of the housing 70 with the valve body 10, the movement of the housing 70 away from the valve body 10 is restricted. Therefore, the housing 70 can be fixed to the valve body 10 without the use of screws. Thus, the steps for fixing the housing 70 to the valve body 10 can be reduced.

[0082] Additionally, the valve body 10 has a recess 21b. The mounting plate 82 has a protrusion 82a that hooks onto the recess 21b. In this way, the housing 70 can be fixed to the valve body 10 with a simple structure.

[0083] Furthermore, during the assembly of the electric valve 1, if the mounting plate 82 moves in the insertion direction (downward) within the retaining groove 21, the mounting plate 82 elastically deforms, and the recess 21b and the protrusion 82a hook together. Specifically, when the protrusion 82a contacts the bottom surface 21a of the retaining groove 21, the mounting plate 82 elastically deforms; when the protrusion 82a engages with the recess 21b, the mounting plate 82 returns to its elastically deformed state. In this way, during the assembly of the electric valve 1, when the housing 28 is inserted into the stator 60, the mounting plate 82 is inserted into the inside of the retaining groove 21 through the opening of the retaining groove 21 and moves in the insertion direction within the retaining groove 21. If the protrusion 82a contacts the bottom surface 21a of the retaining groove 21, the mounting plate 82 elastically deforms; if the protrusion 82a engages with the recess 21b, the mounting plate 82 returns to its elastically deformed state. Therefore, the steps for fixing the housing 70 to the valve body 10 can be reduced.

[0084] Furthermore, the width of the mounting plate 82 is the same as the width of the retaining groove 21. This allows for more effective suppression of the rotation of the housing 70 relative to the valve body 10 about the axis L.

[0085] Furthermore, the outer casing 70 has an outer casing body 71 made of synthetic resin and a metal bracket 80 fixed to the outer casing body 71. Moreover, the bracket 80 has a bracket body 81 formed by stamping into a circular ring shape and a mounting plate 82 continuously disposed along the inner periphery of the bracket body 81. This allows for the saving of metal sheet material used as the material for the bracket 80.

[0086] In the electric valve 1 described above, the valve body 10 has a recess 21b, and the mounting plate 82 of the housing 70 has a protrusion 82a. Alternatively, the electric valve 1 may have a valve body 10 with a protrusion, and the mounting plate 82 of the housing 70 with a recess that engages with the protrusion. In such a structure, when the mounting plate 82 contacts the protrusion (except when the protrusion engages with the recess), the mounting plate 82 elastically deforms, and when the protrusion engages with the recess, the mounting plate 82 returns to its original elastic deformation state.

[0087] Furthermore, in the electric valve 1 described above, the valve body 10 has a retaining groove 21 as a notch, and the housing 70 has a mounting plate 82 as an anti-rotation part. The electric valve 1 may also have a housing 70 with a notch, and the valve body 10 having an anti-rotation part disposed inside the notch. For example, the electric valve 1 may also have the following structure: the valve body 10 has a raised rib (anti-rotation part) along the vertical direction on its back surface, the mounting plate 82 of the housing 70 has a slit (notch) along the vertical direction, the raised rib is disposed inside the slit, and the mounting plate 82 engages with the valve body 10 to restrict the movement of the raised rib toward the opening of the slit. In this structure, the housing 70 is the first component, and the valve body 10 is the second component. The raised rib of the valve body 10 can also be pressed into the slit of the mounting plate 82. This restricts the movement of the housing 70 away from the valve body 10. Furthermore, it more effectively restricts the rotation of the housing 70 relative to the valve body 10 about the axis L. Alternatively, a protrusion may be provided at the edge of the slit in the mounting plate 82, and a recess may be provided on the convex strip of the valve body 10 for engaging the protrusion. Alternatively, a claw may be provided at the edge of the slit in the mounting plate 82, and a claw receiving portion may be provided on the convex strip of the valve body 10 for engaging the claw.

[0088] Next, refer to Figures 5-9 The structure of a modified example of the fixing structure of the valve body 10 and the outer casing 70 of the electric valve 1 described above will be explained. Figures 5-9 In this document, structures that are identical (including substantially identical) to the electric valve 1 described above are marked with the same symbols and their descriptions are omitted.

[0089] Figure 5 It means Figure 4 A diagram of the structure of the first modified example of the fixed structure. Figure 5 (A) is an enlarged view of the mounting plate and its vicinity from the rear side of the housing. Figure 5 (B) is along Figure 5 A sectional view of the VB-VB line of (A). Figure 5 (C) is a cross-sectional view showing the state of the mounting plate after elastic deformation.

[0090] Figure 5 The fixing structure shown has a retaining groove 21 provided in the valve body 10 and a mounting plate 83 provided in the housing 70.

[0091] Mounting plate 83 has a rectangular shape. The width of mounting plate 83 is the same as the width of retaining groove 21. Mounting plate 83 extends in the vertical direction. A rectangular opening 83a is provided in mounting plate 83. Mounting plate 83 has a claw portion 83b extending upward from the lower edge of opening 83a. Claw portion 83b protrudes from the back side to the front side. Claw portion 83b enters the recess 21b (claw receiving portion) of main body portion 11. Claw portion 83b is disposed inside recess 21b. Claw portion 83b enters recess 21b, thereby restricting the movement of mounting plate 83 toward opening 21k within retaining groove 21. Mounting plate 83 is an anti-rotation portion of housing 70.

[0092] When securing the housing 70 to the valve body 10, the mounting plate 83 is inserted downwards from the upper surface 11a side of the body portion 11 into the retaining groove 21. The mounting plate 83 is inserted into the retaining groove 21 through the opening 21k. If the mounting plate 83 is inserted into the retaining groove 21, then... Figure 5 As shown in (C), the claw 83b of the mounting plate 83 ascends onto the bottom surface 21a of the retaining groove 21, and the mounting plate 83 elastically deforms in a bending manner. If further insertion is made, the mounting plate 83 returns to its original position, as shown in (C). Figure 5 (A) Figure 5 As shown in (B), the claw portion 83b enters the recess 21b of the retaining groove 21. That is, when the claw portion 83b contacts the bottom surface 21a of the retaining groove 21, the mounting plate 83 elastically deforms; when the claw portion 83b engages with the recess 21b, the mounting plate 83 returns to its elastically deformed state. Thus, the recess 21b and the claw portion 83b hook (i.e., engage) with each other, thereby restricting the upward movement of the mounting plate 83 within the retaining groove 21 and holding the mounting plate 83 within the retaining groove 21. As a result, the housing 70 is fixed to the valve body 10.

[0093] Figure 6 It means Figure 4 A diagram of the structure of the second variation of the fixed structure. Figure 6 (A) is an enlarged view of the mounting plate and its vicinity from the rear side of the housing. Figure 6 (B) is along Figure 6 A sectional view of line VIB-VIB in (A). Figure 6 (C) is a cross-sectional view showing the state of the mounting plate after elastic deformation.

[0094] Figure 6 The fixed structure shown has a retaining groove 22 provided in the valve body 10 and a mounting plate 84 provided in the housing 70.

[0095] The retaining groove 22 is formed to extend downward from the upper surface 11a of the main body 11. The retaining groove 22 extends in the vertical direction. There is no wall at the upper end of the retaining groove 22, and the upper end of the retaining groove 22 opens in the extending direction of the retaining groove 22. That is, the retaining groove 22 has an opening 22k at its upper end. The main body 11 has an opening extending from the bottom surface 22a of the retaining groove 22 towards the back side ( Figure 6 The right side of (B) has a protruding claw portion 22b. The claw portion 22b has an inclined surface 22c and a retaining surface 22d. The inclined surface 22c is formed such that it gradually moves from the front side to the back side as it moves from top to bottom. The retaining surface 22d is formed facing downward. The retaining groove 22 is a cutout in the valve body 10.

[0096] Mounting plate 84 has a rectangular shape. The width of mounting plate 84 is the same as the width of retaining groove 22. Mounting plate 84 extends in the vertical direction. A rectangular opening 84a is provided in mounting plate 84. Claw portion 22b enters the inside of opening 84a. Claw portion 22b is disposed inside opening 84a. The lower edge 84b (claw bearing portion) of opening 84a of mounting plate 84 contacts the retaining surface 22d of claw portion 22b, thereby restricting the movement of mounting plate 84 toward opening 22k within retaining groove 22. Mounting plate 84 is an anti-rotation part of housing 70.

[0097] When securing the housing 70 to the valve body 10, the mounting plate 84 is inserted into the retaining groove 22 from the upper surface 11a side downwards. The mounting plate 84 is inserted into the retaining groove 22 through the opening 22k. If the mounting plate 84 is inserted into the retaining groove 22, then... Figure 6 As shown in (C), the lower end of the mounting plate 84 ascends onto the inclined surface 22c of the claw portion 22b, and the mounting plate 84 elastically deforms in a bending manner. Then, if further insertion is performed, the mounting plate 84 returns to its original position, as shown in (C). Figure 6 (A) Figure 6 As shown in (B), the claw portion 22b enters the opening 84a of the mounting plate 84. That is, when the mounting plate 84 contacts the claw portion 22b (except when the claw portion 22b engages with the lower edge 84b of the opening 84a of the mounting plate 84), the mounting plate 84 elastically deforms, and when the claw portion 22b engages with the lower edge 84b of the opening 84a of the mounting plate 84, the mounting plate 84 returns to its elastically deformed state. Thus, the retaining surface 22d of the claw portion 22b hooks (i.e., engages) with the lower edge 84b of the mounting plate 84, thereby restricting the upward movement of the mounting plate 84 within the retaining groove 22 and holding the mounting plate 84 within the retaining groove 22. As a result, the housing 70 is fixed to the valve body 10.

[0098] Figure 7 It means Figure 4 The diagram shows the structure of the third variation of the fixed structure. Figure 7 (A) is an enlarged view of the mounting plate and its vicinity from the rear side of the housing. Figure 7 (B) is along Figure 7 A sectional view of line VIIB-VIIB in (A). Figure 7 (C) is a cross-sectional view showing the state of the mounting plate after elastic deformation.

[0099] Figure 7 The fixed structure shown has a retaining groove 23 provided in the valve body 10 and a mounting plate 85 provided in the housing 70.

[0100] like Figure 7 As shown in (A), the retaining groove 23 has a first portion 23a extending downward from the upper surface 11a of the main body 11 and two second portions 23b (claw receiving portions) extending laterally from the lower end of the first portion 23a. The first portion 23a extends in the vertical direction. There is no wall at the upper end of the first portion 23a, and the upper end of the first portion 23a is open in the extending direction of the first portion 23a. That is, the first portion 23a has an opening 23k at its upper end. The second portions 23b are disposed below the stepped portion 11b provided on the main body 11. The retaining groove 23 is a cutout provided on the valve body 10.

[0101] The mounting plate 85 has a generally rectangular shape. The width of the mounting plate 85 is the same as the width of the first portion 23a of the retaining groove 23. The mounting plate 85 extends vertically. The mounting plate 85 has four arms 85a and two claws 85b. The four arms 85a extend downward from top to bottom. The four arms 85a are arranged laterally at intervals. Claws 85b are continuously provided at the lower ends of the two central arms 85a. The two claws 85b extend laterally away from each other from the continuous arrangement portion of the arms 85a. The claws 85b enter the second portion 23b of the retaining groove 23. The two claws 85b are disposed inside the two second portions 23b. The claws 85b entering the second portions 23b thereby restricting the movement of the mounting plate 85 toward the opening 23k within the retaining groove 23. The mounting plate 85 is an anti-rotation part of the housing 70.

[0102] When securing the housing 70 to the valve body 10, the mounting plate 85 is inserted from the upper surface 11a side downwards into the first portion 23a of the retaining groove 23. The mounting plate 85 is inserted into the first portion 23a through the opening 23k. If the mounting plate 85 is inserted into the first portion 23a, then... Figure 7 As shown in (C), the two claws 85b of the mounting plate 85 ascend the stepped portion 11b, and the mounting plate 85 elastically deforms in a bending manner. Then, if further insertion is performed, the mounting plate 85 returns to its original position, as shown in (C). Figure 7 (A) Figure 7As shown in (B), the claw portion 85b enters the second portion 23b of the retaining groove 23. Thus, the claw portion 85b and the second portion 23b hook (i.e., engage) with each other, thereby retaining the mounting plate 85 within the retaining groove 23 in a manner that restricts upward movement of the mounting plate 85 within the retaining groove 23. As a result, the housing 70 is secured to the valve body 10.

[0103] Figure 8 It means Figure 4 The diagram shows the structure of the fourth variation of the fixed structure. Figure 8 (A) is an enlarged view of the mounting plate and its vicinity from the rear side of the housing. Figure 8 (B) is along Figure 8 A sectional view of line VIIIB-VIIIB of (A). Figure 8 (C) is an enlarged view of the mounting plate and its vicinity from the rear side, showing the state of the mounting plate under elastic deformation.

[0104] Figure 8 The shown fixing structure has a retaining groove 23 disposed in the valve body 10 and a mounting plate 86 disposed in the housing 70. The retaining groove 23 and Figure 7 The third variant shown has the same structure.

[0105] The mounting plate 86 has a generally rectangular shape. The width of the mounting plate 86 is the same as the width of the first portion 23a of the retaining groove 23. The mounting plate 86 extends vertically. The mounting plate 86 has two arms 86a and two claws 86b. The two arms 86a extend downward from top to bottom. The two arms 86a are arranged laterally spaced apart from each other. Claws 86b are continuously provided at the lower ends of the two arms 86a near the inner side in the width direction. The two claws 86b extend laterally away from each other from the continuous arrangement portion of the arms 86a. The claws 86b enter the second portion 23b of the retaining groove 23. The two claws 86b are disposed inside the two second portions 23b. The claws 86b entering the second portions 23b thereby restricts the movement of the mounting plate 86 toward the opening 23k within the retaining groove 23. The mounting plate 86 is an anti-rotation part of the housing 70.

[0106] When securing the housing 70 to the valve body 10, the mounting plate 86 is inserted from the upper surface 11a side downwards into the first portion 23a of the retaining groove 23. The mounting plate 86 is inserted into the first portion 23a through the opening 23k. If the mounting plate 86 is inserted into the first portion 23a, then... Figure 8 As shown in (C), the two claws 86b of the mounting plate 86 abut against the stepped portion 11b, and the arms 86a and claws 86b elastically deform in a way that bends inward in the width direction. Then, if further insertion is performed, the arms 86a and claws 86b return to their original positions, as shown in (C). Figure 8 (A) Figure 8 As shown in (B), the claw portion 86b enters the second portion 23b of the retaining groove 23. Thus, the claw portion 86b and the second portion 23b hook (i.e., engage) with each other, thereby retaining the mounting plate 86 within the retaining groove 23 in a manner that restricts upward movement of the mounting plate 86 within the retaining groove 23. Consequently, the housing is secured to the valve body.

[0107] Figure 9 It means Figure 4 The diagram shows the structure of the fifth variation of the fixed structure. Figure 9 (A) is an enlarged view of the mounting plate and its vicinity from the rear side of the housing. Figure 9 (B) is along Figure 9 A cross-sectional view of line IXB-IXB of (A). Figure 9 (C) is an enlarged view of the mounting plate of the casing.

[0108] Figure 9 The fixing structure shown has a retaining groove 24 provided in the valve body 10 and a mounting plate 87 provided in the housing 70.

[0109] like Figure 9 As shown in (A), the retaining groove 24 is formed to extend downward from the upper surface 11a of the main body 11. The retaining groove 24 extends in the vertical direction. There is no wall at the upper end of the retaining groove 24, and the upper end of the retaining groove 24 is open in the extending direction of the retaining groove 24. That is, the retaining groove 24 has an opening 24k at the upper end. The retaining groove 24 is a cutout of the valve body 10.

[0110] The mounting plate 87 has a rectangular shape. The width of the mounting plate 87 is slightly larger than the width of the retaining groove 24. The mounting plate 87 extends in the vertical direction. The mounting plate 87 has two arms 87a and a plurality of barbs 87b. The two arms 87a extend from top to bottom. The two arms 87a are arranged spaced apart from each other in the horizontal direction. A plurality of barbs 87b are arranged on the outer edges of the two arms 87a in the width direction. The plurality of barbs 87b are formed in a wedge shape with their tips facing downward. The mounting plate 87 is pressed into the retaining groove 24. In addition, the plurality of barbs 87b wedged into the inner surface of the retaining groove 24 (i.e., the main body 11). This restricts the movement of the mounting plate 87 toward the opening 24k within the retaining groove 24. The mounting plate 87 is an anti-rotation part of the housing 70.

[0111] When securing the housing 70 to the valve body 10, the mounting plate 87 is inserted downwards from the upper surface 11a side into the retaining groove 24. The mounting plate 87 is inserted into the retaining groove 24 through the opening 24k. When the mounting plate 87 is inserted into the retaining groove 24, the mounting plate 87 is pressed into the retaining groove 24, and a plurality of barbs 87b wed into the inner surface of the retaining groove 24. Thus, the mounting plate 87 is held in the retaining groove 24 in a manner that restricts upward movement of the mounting plate 87 within the retaining groove 24. As a result, the housing 70 is secured to the valve body 10.

[0112] The mounting plate 87 is pressed into the retaining groove 24, thereby allowing the housing 70 to be secured to the valve body 10 with a simple structure. Furthermore, the mounting plate 87 has multiple barbs 87b formed to wed into the body portion 11, thereby enabling the housing 70 to be more reliably secured to the valve body 10. Alternatively, the mounting plate 87 may have multiple barbs 87b provided only on one arm portion 87a. The mounting plate 87 may also have only one barb 87b. The mounting plate 87 may also be without barbs 87b.

[0113] In having Figures 5-9 The electric valve with the fixed structure shown also performs the same function as the electric valve 1 described above. In addition, in each of the above-described fixed structures, the mounting plate can be elastically deformed by hand when the housing 70 is fixed to the valve body 10.

[0114] Next, refer to Figure 10 The structure of the modified example of the electric valve 1 described above is explained. Figure 10 The electric valve 1A shown replaces the main body 11 with a valve body 10A, which includes the main body 11A and a flow path block 11B. Apart from this, the electric valve 1A has the same (including substantially the same) structure as the electric valve 1 described above. Figure 10 In the text, structures identical to the electric valve 1 described above are marked with the same symbols and their descriptions are omitted.

[0115] The valve body 10A is made of metal such as aluminum alloy. The valve body 10A has a main body portion 11A, a flow path block 11B, a cylindrical portion 12, and a flange portion 13.

[0116] The main body 11A has a cylindrical shape. The main body 11A is configured to protrude from the upper surface 11c of the flow path block 11B. The main body 11A is threaded onto the flow path block 11B. Flow paths 18 and 19 are provided in the flow path block 11B. Flow path 18 is connected to flow path 15 of the main body 11A. Flow path 19 is connected to flow path 16 of the main body 11A.

[0117] A retaining groove 21A is provided on the back side of the flow path block 11B. The retaining groove 21A is formed to extend downward from the upper surface 11c. A recess 21b is provided on the bottom surface 21a of the retaining groove 21A, and the recess 21b extends from the back side to the front side (from...). Figure 10 A circular hole extending from the right side to the left. The mounting plate 82 of the housing 70 is inserted into the retaining groove 21A from the upper surface 11c side downwards. The mounting plate 82 is inserted into the retaining groove 21A through the opening 21k. In the retaining groove 21A, the recess 21b and the protrusion 82a hook (i.e., engage) with each other to restrict the movement of the mounting plate 82 toward the opening 21k in the retaining groove 21A, thereby holding the mounting plate 82 in the retaining groove 21A.

[0118] exist Figure 10 The electric valve 1A shown also has the same function as the electric valve 1 described above.

[0119] In this specification, terms such as "cylinder" and "cubic prism" used to describe the shape of a component are also used for components that substantially have the shape described by that term. For example, "cylinder-shaped component" includes both components that are cylindrical in shape and components that are substantially cylindrical in shape.

[0120] The embodiments of the present invention have been described above, but the present invention is not limited to the structure of the embodiments. Any technical solutions by adding, deleting, or designing appropriate constituent elements to the above embodiments, or by appropriately combining the features of the embodiments, as long as they do not violate the spirit of the present invention, are also included within the scope of the present invention.

[0121] Symbol Explanation

[0122] 1, 1A…Electric valve; 10, 10A…Valve body; 11, 11A…Main body; 11B…Flow path block; 11a…Upper surface; 11b…Stepped section; 11c…Upper surface; 12…Cylindrical section; 12a…Matching hole; 13…Flange section; 14…Valve chamber; 15, 16…Flow path; 17…Port; 18, 19…Flow path; 21, 21A…Retaining groove; 21a…Bottom surface; 21b…Recess; 21k…Opening; 22… 22a…bottom surface, 22b…claw, 22c…inclined surface, 22d…retaining surface, 22k…opening, 23…retaining groove, 23a…first part, 23b…second part, 23k…opening, 24…retaining groove, 24k…opening, 28…housing, 30…drive mechanism, 31…magnetic rotor, 32…valve shaft retainer, 32c…internal thread, 33…guide bushing, 33a…first cylindrical part, 33b…second cylindrical part Part, 33c…external thread, 34…valve shaft, 34a…upper end, 34b…stepped part, 35…support ring, 36…push nut, 37…closing spring, 40…valve core, 50…stator unit, 60…stator, 61…upper stator, 62…lower stator, 63…molded part, 64…terminal support, 65…terminal, 70…housing, 71…housing body, 72…peripheral wall, 73…upper wall, 74…dot, 75…cylinder 76… Connector section, 80… Bracket, 81… Bracket body, 82… Mounting plate, 82a… Protrusion, 83… Mounting plate, 83a… Opening, 83b… Claw, 84… Mounting plate, 84a… Opening, 84b… Lower edge, 85… Mounting plate, 85a… Arm, 85b… Claw, 86… Mounting plate, 86a… Arm, 86b… Claw, 87… Mounting plate, 87a… Arm, 87b… Barb, 90… Enclosure component.

Claims

1. An electric valve comprising: a valve body, a cylindrical stator, a cylindrical housing coaxially disposed inside the stator and engaging with the valve body, and a housing accommodating the stator, characterized in that, The valve body has a notch. The outer casing has an anti-rotation portion disposed inside the cut. The cut has an opening at the end on the outer casing side. The anti-rotation part engages with the valve body to restrict the movement of the anti-rotation part toward the opening. The valve body has a retaining groove that serves as the cut. The outer casing has a mounting plate that serves as the anti-rotation part. The mounting plate extends along the axis of the housing toward the valve body. The mounting plate has claw-like parts. The valve body has a claw receiving portion for engaging the claw portion. The mounting plate abuts against the bottom of the retaining groove. The width of the mounting plate is the same as the width of the retaining groove.

2. The electric valve according to claim 1, characterized in that, When the claw contacts the inner surface of the retaining groove, the mounting plate elastically deforms. When the claw portion engages with the claw bearing portion, the mounting plate recovers from the elastic deformation.

3. An electric valve comprising: a valve body, a cylindrical stator, a cylindrical housing coaxially disposed inside the stator and engaging with the valve body, and a housing accommodating the stator, characterized in that, The valve body has a notch. The outer casing has an anti-rotation portion disposed inside the cut. The cut has an opening at the end on the outer casing side. The anti-rotation part engages with the valve body to restrict the movement of the anti-rotation part toward the opening. The valve body has a retaining groove that serves as the cut. The outer casing has a mounting plate that serves as the anti-rotation part. The mounting plate extends along the axis of the housing toward the valve body. The valve body has a claw portion. The mounting plate has a claw receiving portion for engaging the claw portion. The mounting plate abuts against the bottom of the retaining groove. The width of the mounting plate is the same as the width of the retaining groove.

4. The electric valve according to claim 3, characterized in that, Except when the claw portion engages with the claw bearing portion, the mounting plate elastically deforms when it contacts the claw portion. When the claw portion engages with the claw bearing portion, the mounting plate recovers from the elastic deformation.

5. The electric valve according to any one of claims 1 to 4, characterized in that, The outer casing has a synthetic resin body and a metal bracket fixed to the body. The bracket has a bracket body in the shape of a circular plate and a mounting plate continuously disposed along the inner periphery of the bracket body.

6. An electric valve comprising: a valve body, a cylindrical stator, a cylindrical housing coaxially disposed inside the stator and engaging with the valve body, and a housing accommodating the stator, characterized in that, The valve body has a notch. The outer casing has an anti-rotation portion disposed inside the cut. The cut has an opening at the end on the outer casing side. The anti-rotation part engages with the valve body to restrict the movement of the anti-rotation part toward the opening. The valve body has a retaining groove that serves as the cut. The outer casing has a mounting plate that serves as the anti-rotation part. The mounting plate extends along the axis of the housing toward the valve body. After the mounting plate is pressed into the retaining groove, the mounting plate abuts against the bottom of the retaining groove. The width of the mounting plate is the same as the width of the retaining groove.

7. The electric valve according to claim 6, characterized in that, The mounting plate has at least one barb that is formed to wed into the valve body.

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