Stator unit and motor valve

Abstract

To provide a stator unit and a motor valve the rigidity of which can be secured with less resin.SOLUTION: A stator unit 50 of a motor valve 1 comprises a stator, a housing 70 and a case 80. The housing 70 comprises: a peripheral wall part; an upper wall part 72 connected with the peripheral wall part; a dome part 73 projecting upward from the upper wall part 72; and a square-cylinder-shaped coupling part 75 extending in a longitudinal direction. The coupling part 75 comprises a tip part 76 and a top plate part 77. The tip part 76 projects in the longitudinal direction from the peripheral wall part and connected with the case 80. The top plate part 77 has a flat plate shape and projects upward from the upper wall part 72. An upper surface 77a of the top plate part 77 is provided with a projection part 78 extending from the dome part 73 to the tip part 76.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a stator unit and a motor-operated valve. [Background technology]

[0002] An example of a conventional motor-operated valve is disclosed in Patent Document 1. The motor-operated valve in Patent Document 1 has a magnet rotor and a permanent magnet that rotates together with the magnet rotor. The magnet rotor and the permanent magnet are disposed inside a can. A magnetic sensor is disposed outside the can. This motor-operated valve detects the magnetism of the permanent magnet with the magnetic sensor to obtain the rotation angle of the magnet rotor. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2018-179133 A Summary of the Invention [Problem to be solved by the invention]

[0004] 16 and 17 show another conventional motor-operated valve 901. The motor-operated valve 901 has a configuration for acquiring the rotation angle of the magnet rotor, similar to the motor-operated valve of Patent Document 1. The motor-operated valve 901 has a valve body 910, a stator 960, a housing 970, and a case 980. The housing 970 has a peripheral wall portion 971, an upper wall portion 972, a dome portion 973, and a connecting portion 975. The connecting portion 975 has a rectangular tube shape extending in the lateral direction (X direction). A tip portion 976 of the connecting portion 975 protrudes in the lateral direction from the peripheral wall portion 971. A case 980 is joined to the tip portion 976. A top plate portion 977 of the connecting portion 975 has a flat plate shape and protrudes upward (Z direction) from the upper wall portion 972.

[0005] The housing 970 is made of synthetic resin. The housing 970 is formed by injection molding. When the housing 970 is injection molded, a relatively large weld line may be generated in the center of the width direction (Y direction) of the top plate portion 977 of the connecting portion 975. This may cause a crack to be generated along the weld line.

[0006] Therefore, an object of the present invention is to provide a stator unit capable of suppressing the occurrence of weld lines and an electric valve having the stator unit. [Means for solving the problem]

[0007] In order to achieve the above-mentioned object, a stator unit according to one embodiment of the present invention is a stator unit having a stator, a resin housing that accommodates the stator, and a resin case that is joined to the housing, wherein the housing integrally has a peripheral wall portion, an upper wall portion connected to the peripheral wall portion, a dome portion that protrudes upward from the upper wall portion, and a rectangular cylindrical connecting portion that extends laterally, the connecting portion protruding laterally from the peripheral wall portion and having a tip portion to which the case is joined, and a flat top plate portion that protrudes upward from the upper wall portion, and a convex rib portion is provided in the widthwise center of the upper surface of the top plate portion, extending from the dome portion to the tip portion.

[0008] According to the present invention, the housing has a rectangular tubular connecting portion extending laterally. The tip of the connecting portion protrudes laterally from the peripheral wall of the housing. The top plate of the connecting portion has a flat plate shape and protrudes upward from the upper wall of the housing. A convex rib extending from a dome portion provided on the upper wall to the tip of the connecting portion is provided at the center of the width direction (direction perpendicular to the extension direction of the connecting portion) of the upper surface of the top plate portion. As a result, the thickness of the center of the width direction of the top plate portion is larger than the thickness of both ends of the top plate portion in the width direction, and when the housing is injection molded, the resin is likely to flow to the center of the width direction of the top plate portion. Therefore, the resin flows first to the center of the width direction of the top plate portion, and then the resin flows to spread to both ends of the width direction of the top plate portion, thereby suppressing the occurrence of a weld line in the center.

[0009] In the present invention, it is preferable that a concave surface extending in the lateral direction is provided at a portion where the upper wall portion and the connecting portion are connected to each other. In this way, the thickness of the portion where the upper wall portion and the connecting portion of the housing are connected to each other is smaller than in a configuration in which the portion is raised, and sinking of the resin can be suppressed.

[0010] In the present invention, it is preferable that the tip of the connecting portion has a housing side joint surface having a rectangular frame shape and a housing side reference surface having a rectangular frame shape arranged so as to surround the housing side joint surface, the case has a case side joint surface having a rectangular frame shape that is joined to the housing side joint surface and a case side reference surface arranged so as to surround the case side joint surface and that contacts the housing side reference surface, and a notch is provided at the center of the upper side and the center of the lower side of the case side reference surface. The tip of the connecting portion is likely to have a weld line in the center of its width direction. Therefore, by providing a notch at the center of the upper side and the center of the lower side of the case side reference surface, even if a bulge occurs due to a weld line at the center of the upper side and the center of the lower side of the housing side reference surface, the bulge can be prevented from contacting the case side reference surface. Therefore, the housing side reference surface and the case side reference surface are correctly in contact with each other, and the housing and the case can be properly joined.

[0011] In the present invention, it is preferable that the lower surface of the top plate portion is disposed above the upper surface of the upper wall portion. In this way, the connecting portion is enlarged in the vertical direction, and the tip portion of the connecting portion can be enlarged. As a result, the housing side joint surface and the case side joint surface can be enlarged, and the housing and the case can be joined more firmly.

[0012] In the present invention, it is preferable that the case integrally has a box-shaped case body and a cylindrical connector, the case side joint surface and the case side reference surface are provided on one wall of the case body, the connector is erected on another wall connected to the one wall of the case body, a first rib extending from the case side reference surface to a connecting point with the other wall is provided on the outer surface of the one wall, a second rib is provided between the outer surface of the other wall and the outer peripheral surface of the connector, and the first rib and the second rib are arranged to face each other with the connector between them when viewed from the axial direction of the connector. In this way, it is possible to prevent the connector from tilting relative to the case body as the resin hardens when the case is injection molded.

[0013] In order to achieve the above object, a motor-operated valve according to another aspect of the present invention is an motor-operated valve having a valve body, a can joined to the valve body, and a stator unit that houses the can, the stator unit being the above-mentioned stator unit. In this way, it is possible to suppress the occurrence of weld lines in a housing of the stator unit. Effect of the Invention

[0014] According to the present invention, the occurrence of weld lines in the housing of the stator unit can be suppressed. [Brief description of the drawings]

[0015] [Figure 1] 1 is a front view of a motor-operated valve according to an embodiment of the present invention. FIG. [Diagram 2] FIG. 2 is a right side view of the motor-operated valve of FIG. [Diagram 3] FIG. 2 is a rear view of the motor-operated valve of FIG. [Figure 4] FIG. 2 is a left side view of the motor-operated valve of FIG. [Diagram 5] FIG. 2 is a plan view of the motor-operated valve of FIG. [Figure 6] FIG. 2 is a bottom view of the motor-operated valve of FIG. [Figure 7] FIG. 2 is a vertical cross-sectional view of the motor-operated valve of FIG. [Figure 8] FIG. 8 is a cross-sectional view taken along line VIII-VIII in FIG. [Figure 9] 2 is a front perspective view of the motor-operated valve of FIG. 1 as viewed from the upper right. FIG. [Figure 10] 2 is a perspective view of the motor-operated valve of FIG. 1 as viewed from the lower left front side. [Figure 11] 2 is a perspective view of the motor-operated valve of FIG. 1 as viewed from the upper left rear side. [Figure 12] 2 is a perspective view of the motor-operated valve of FIG. 1 as viewed from the lower left rear side. [Figure 13] 2 is a perspective view of a stator and a housing of a stator unit of the motor-operated valve of FIG. 1. [Figure 14] 2 is a perspective view of a stator included in a stator unit of the motor-operated valve of FIG. 1. [Figure 15] 2 is a perspective view of a case body and a connector of a stator unit of the motor-operated valve of FIG. 1. [Figure 16] FIG. 1 is a left side view of a conventional motor-operated valve. [Figure 17] 17 is a perspective view of a stator and a housing of the stator unit of the motor-operated valve of FIG. 16. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Hereinafter, a motor-operated valve according to one embodiment of the present invention will be described with reference to FIGS.

[0017] 1 to 6 are a front view, a right side view, a rear view, a left side view, a plan view, and a bottom view of an electric valve according to an embodiment of the present invention. FIG. 7 is a cross-sectional view (longitudinal cross-sectional view) along the axis L of the electric valve of FIG. 1. FIG. 8 is a cross-sectional view along the line VIII-VIII of FIG. 7. In FIG. 8, the configuration inside the can is omitted. FIG. 9 is a perspective view of the electric valve of FIG. 1 as seen from the upper right front side. FIG. 10 is a perspective view of the electric valve of FIG. 1 as seen from the lower left front side. FIG. 11 is a perspective view of the electric valve of FIG. 1 as seen from the upper left rear side. FIG. 12 is a perspective view of the electric valve of FIG. 1 as seen from the lower left rear side. FIG. 13 is a perspective view of a stator and a housing of the stator unit of the electric valve of FIG. 1. FIG. 14 is a perspective view of a stator of the stator unit of the electric valve of FIG. 1. FIG. 15 is a perspective view of a case body and a connector of the stator unit of the electric valve of FIG. 1. In each figure, the X direction is the left-right direction (horizontal direction), the Y direction is the front-rear direction, and the Z direction is the up-down direction (axis L direction).

[0018] As shown in each figure, the motor-operated valve 1 has a valve body 10, a can 20, a drive mechanism 30, a valve element 40, and a stator unit 50.

[0019] The valve body 10 is made of a metal such as an 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 rectangular parallelepiped shape. The cylindrical portion 12 is disposed so as to protrude from the upper surface of the main body portion 11. The cylindrical portion 12 is attached to the main body portion 11 by a screw structure. The main body portion 11 is provided with a valve chamber 14 and flow paths 15 and 16. The flow path 15 is connected to the valve chamber 14. The 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 peripheral edge of the flange portion 13 is joined to the upper end of the cylindrical portion 12.

[0020] The can 20 is made of a metal such as stainless steel. The can 20 has a cylindrical shape with a closed upper end. The lower end of the can 20 is joined to the outer periphery of the flange portion 13.

[0021] The drive mechanism 30 moves the valve body 40 in the vertical direction. The drive mechanism 30 has a magnet rotor 31, a valve stem holder 32, a guide bush 33, and a valve stem .

[0022] The magnet rotor 31 has a cylindrical shape. The outer diameter of the magnet rotor 31 is slightly smaller than the inner diameter of the can 20. A plurality of N poles and a plurality of S poles are provided on the outer circumferential surface of the magnet rotor 31. The plurality of N poles and the plurality of S poles extend in the vertical direction and are arranged alternately at equal intervals in the circumferential direction.

[0023] The stem holder 32 has a cylindrical shape with a closed upper end. A support ring 35 is fixed to the upper end of the stem holder 32. The magnet rotor 31 and the stem holder 32 are integrally joined via the support ring 35. The stem holder 32 has an internal thread 32c on its inner circumferential surface.

[0024] The guide bush 33 has a first cylindrical portion 33a and a second cylindrical portion 33b integrally therewith. 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. The outer peripheral surface of the second cylindrical portion 33b is provided with a male thread 33c that is screwed into the female thread 32c of the valve shaft holder 32. The first cylindrical portion 33a is press-fitted into a fitting hole 12a provided in the cylindrical portion 12 of the valve body 10. The guide bush 33 is connected to the valve body 10.

[0025] The valve shaft 34 has a cylindrical shape. An upper end 34a of the valve shaft 34 passes through the valve shaft holder 32. A push nut 36 is attached to the upper end 34a of the valve shaft 34 to prevent it from coming off. The valve shaft 34 passes through the guide bush 33 and the cylindrical portion 12, and its lower end is disposed in the valve chamber 14. A valve-closing spring 37 is disposed between the valve shaft holder 32 and the step portion 34b of the valve shaft 34. The valve-closing spring 37 is a compression coil spring. The valve-closing spring 37 presses the valve shaft 34 downward.

[0026] The valve element 40 is provided integrally with the lower end of the valve shaft 34. The valve element 40 is disposed in the valve chamber 14. The valve element 40 is moved in the vertical direction by the drive mechanism 30. The movement of the valve element 40 opens and closes the port 17.

[0027] The stator unit 50 includes a stator 60 , a housing 70 , and a case 80 .

[0028] The stator 60 has a cylindrical shape. The stator 60 constitutes a stepping motor together with the magnet rotor 31. The stator 60 has an upper stator 61, a lower stator 62, and a mold 63 made of synthetic resin.

[0029] The upper stage stator 61 and the lower stage stator 62 are arranged one above the other. The upper stage stator 61 has a plurality of claw pole type pole teeth 61a arranged at equal intervals in the circumferential direction. The lower stage stator 62 has a plurality of claw pole type pole teeth 62a arranged at equal intervals in the circumferential direction. A mold 63 is filled inside the upper stage stator 61 and the lower stage stator 62. The mold 63, together with the plurality of pole teeth 61a, 62a, constitutes the inner peripheral surface 60a of the stator 60. The mold 63 has a terminal support portion 64.

[0030] The terminal support portion 64 is disposed so as to extend in the horizontal direction (X direction) from the upper stator 61 and the lower stator 62. The terminal support portion 64 supports a plurality of terminals 65. The plurality of terminals 65 protrude in the horizontal direction from the tip of the terminal support portion 64. The plurality of terminals 65 are connected to coils that the upper stator 61 and the lower stator 62 have.

[0031] The housing 70 is made of synthetic resin. The housing 70 is formed by injection molding. The housing 70 has a shape that is mirror-symmetric with respect to a plane that includes the axis L and is parallel to the XZ plane. The housing 70 accommodates the stator 60. The housing 70 integrally includes a peripheral wall portion 71, an upper wall portion 72, a dome portion 73, a cylindrical portion 74, and a connecting portion 75.

[0032] The peripheral wall portion 71 has a cylindrical shape. The upper wall portion 72 is connected to the upper end of the peripheral wall portion 71. The dome portion 73 protrudes upward from the center of the upper wall portion 72. The can 20 is inserted into the stator 60 and the dome portion 73. The tubular portion 74 has a cylindrical shape with a smaller diameter than the peripheral wall portion 71. The tubular portion 74 protrudes downward from the peripheral wall portion 71. The tubular portion 74 is disposed so as to surround the cylindrical portion 12 of the valve body 10. A ring-shaped sealing member 79 is disposed between the cylindrical portion 74 and the cylindrical portion 12. The sealing member 79 is made of an elastic material such as rubber.

[0033] The connecting portion 75 has a rectangular tube shape extending in the horizontal direction (X direction). A tip portion 76 of the connecting portion 75 protrudes in the horizontal direction from the peripheral wall portion 71. The tip portion 76 is provided with a housing side opening 76a, a housing side joint surface 76b, and a housing side reference surface 76c. The housing side opening 76a is a rectangular opening facing the horizontal direction (X direction, rightward). The housing side joint surface 76b is a rectangular frame-shaped flat surface facing the same direction as the housing side opening 76a. The housing side joint surface 76b is arranged so as to surround the housing side opening 76a. The housing side reference surface 76c is a rectangular frame-shaped flat surface facing the same direction as the housing side joint surface 76b. The housing side reference surface 76c is arranged so as to surround the housing side joint surface 76b. The housing side reference surface 76c is arranged closer to the peripheral wall portion 71 than the housing side joint surface 76b. The terminal support portion 64 and a plurality of terminals 65 of the stator 60 protrude from the housing side opening 76a.

[0034] The top plate portion 77 of the connecting portion 75 has a flat plate shape. The top plate portion 77 protrudes upward from the upper wall portion 72. A convex rib portion 78 is provided on an upper surface 77a of the top plate portion 77. The convex rib portion 78 extends from the dome portion 73 to the tip portion 76. The convex rib portion 78 is disposed in the center of the upper surface 77a in the width direction (Y direction). The lower surface 77b of the top plate portion 77 is entirely flat. The lower surface 77b is disposed above the upper surface 72a of the upper wall portion 72. The thickness of the center portion of the top plate portion 77 in the width direction (where the convex rib portion 78 is disposed) is greater than the thickness of both ends of the top plate portion 77 in the width direction.

[0035] A concave surface 75a is provided at the joint between the upper wall portion 72 and the connecting portion 75. By providing the concave surface 75a, the joint between the upper wall portion 72 and the connecting portion 75 is prevented from rising.

[0036] The case 80 is made of synthetic resin. The case 80 is formed by injection molding. The case 80 has a shape that is mirror-symmetric with respect to a plane that includes the axis L and is parallel to the XZ plane. The case 80 has a case body 81, a lid 82, and a connector 83. The case body 81 has a rectangular parallelepiped box shape with one side open. The lid 82 has a flat plate shape and is arranged to close the opening on the side of the case body 81. The connector 83 has a cylindrical shape with an elliptical cross section. The connector 83 is arranged to extend upward from the case body 81. The case body 81 and the connector 83 are integrally formed.

[0037] The case body 81 houses a substrate 86. The substrate 86 is a printed circuit board on which electronic components are mounted. Magnetic sensors 87a and 87b are mounted on the substrate 86. In addition to the magnetic sensors 87a and 87b, a microcomputer or the like may be mounted on the substrate 86. The microcomputer may function as a device that calculates the rotation angle of the magnet rotor 31 and the valve opening degree (opening degree of the port 17) based on the output signals of the magnetic sensors 87a and 87b. A plurality of terminals 65 of the stator 60 are connected to the substrate 86.

[0038] A side wall portion 84 (one wall portion) of the case main body 81 faces the cover body 82. The side wall portion 84 is provided with a case side opening 84a, a case side joint surface 84b, and a case side reference surface 84c. The case side opening 84a is a rectangular opening facing the horizontal direction (X direction, leftward). The case side opening 84a is connected to the housing side opening 76a. The case side joint surface 84b is a rectangular frame-shaped flat surface facing the same direction as the case side opening 84a. The case side joint surface 84b is disposed so as to surround the case side opening 84a. The case side joint surface 84b is joined to the housing side joint surface 76b by, for example, infrared welding, ultrasonic welding, adhesive, or the like. The case side reference surface 84c is a rectangular frame-shaped flat surface facing the same direction as the case side joint surface 84b. The case side reference surface 84c is disposed so as to surround the case side joint surface 84b. The case side reference surface 84c is disposed closer to the peripheral wall portion 71 than the case side joint surface 84b. Notches 84d and 84e are provided at the center of the upper side and the center of the lower side of the case side reference surface 84c. The case side reference surface 84c contacts the housing side reference surface 76c.

[0039] The upper wall 85 (other wall) of the case body 81 is connected to the upper end of the side wall 84. The connector 83 is erected on the upper wall 85 facing upward. The axial direction of the connector 83 is parallel to the axis L. A first rib 88 is provided on the outer surface 84f of the side wall 84. The first rib 88 extends from a notch 84d on the upper side of the case side reference surface 84c to a connecting portion between the side wall 84 and the upper wall 85. A second rib 89 is provided between the outer surface 85a of the upper wall 85 and the outer peripheral surface 83a of the connector 83. The second rib 89 has a plate shape that forms a right-angled triangle when viewed from the front. The first rib 88 and the second rib 89 are arranged to face each other in the horizontal direction with the connector 83 between them when viewed from above.

[0040] The stator unit 50 also has magnetic transmission members 51a and 51b. The magnetic transmission members 51a and 51b have a strip shape. The magnetic transmission members 51a and 51b are arranged to pass through the housing side opening 76a and the case side opening 84a. One end of the magnetic transmission members 51a and 51b is arranged to face the outer circumferential surface of the can 20. The other end of the magnetic transmission members 51a and 51b is arranged to face the magnetic detection surfaces of the magnetic sensors 87a and 87b. The magnetic transmission members 51a and 51b transmit the magnetism of the N pole and S pole of the magnet rotor 31 to the magnetic sensors 87a and 87b.

[0041] In the electric valve 1, the cylindrical portion 12 of the valve body 10, the port 17, the can 20, the magnet rotor 31, the valve shaft holder 32, the guide bush 33, the valve shaft 34, the valve body 40, the stator 60 (upper stator 61, lower stator 62) and the housing 70 (dome portion 73, cylindrical portion 74) each have an axis that coincides with the axis L.

[0042] Next, the operation of the motor-operated valve 1 will be described.

[0043] In the motor-operated valve 1, electricity is applied to the upper stator 61 and the lower stator 62 so that the magnet rotor 31 rotates in one direction. The stem holder 32 rotates together with the magnet rotor 31. The stem holder 32 moves downward due to the screw feed action between the female thread 32c of the stem holder 32 and the male thread 33c of the guide bush 33. The stem 34 also moves downward together with the stem holder 32, and the valve element 40 closes the port 17 (valve closed state).

[0044] In the motor-operated valve 1, current is applied to the upper stator 61 and the lower stator 62 so that the magnet rotor 31 rotates in the other direction. The stem holder 32 rotates together with the magnet rotor 31. The stem holder 32 moves upward due to the screw feed action between the female thread 32c of the stem holder 32 and the male thread 33c of the guide bush 33. The stem 34 also moves upward together with the stem holder 32, and the valve element 40 opens the port 17 (valve open state).

[0045] As described above, the motor-operated valve 1 of this embodiment has a stator unit 50. The stator unit 50 has a stator 60, a housing 70 that accommodates the stator 60, and a case 80 that is joined to the housing 70. The housing 70 integrally has a peripheral wall portion 71, an upper wall portion 72 that is connected to the peripheral wall portion 71, a dome portion 73 that protrudes upward from the upper wall portion 72, and a rectangular tubular connecting portion 75 that extends laterally. The connecting portion 75 has a tip portion 76 and a top plate portion 77. The tip portion 76 protrudes laterally from the peripheral wall portion 71. The case 80 is joined to the tip portion 76. The top plate portion 77 has a flat plate shape. The top plate portion 77 protrudes upward from the upper wall portion 72. A protruding ridge 78 extending from the dome portion 73 to the tip portion 76 is provided at the center in the width direction of the upper surface 77a of the top plate portion 77.

[0046] According to the motor-operated valve 1, the thickness of the widthwise central portion of the top plate portion 77 is greater than the thickness of both ends of the top plate portion 77. Therefore, when the housing 70 is injection molded, the resin is likely to flow to the widthwise central portion of the top plate portion 77. As a result, the resin flows first to the widthwise central portion of the top plate portion 77, and then the resin flows so as to spread to both ends of the top plate portion 77 in the width direction, which makes it possible to suppress the occurrence of a weld line in the central portion.

[0047] In addition, a concave surface 75a extending laterally is provided at the connecting portion between the upper wall portion 72 of the housing 70 and the connecting portion 75. In this way, the thickness of the connecting portion between the upper wall portion 72 and the connecting portion 75 is smaller than in a configuration in which the connecting portion is raised, and sinking of the resin can be suppressed.

[0048] Further, the tip 76 of the connecting portion 75 has a rectangular frame-shaped housing side joint surface 76b and a rectangular frame-shaped housing side reference surface 76c arranged to surround the housing side joint surface 76b. The case 80 has a rectangular frame-shaped case side joint surface 84b and a case side reference surface 84c arranged to surround the case side joint surface 84b. The case side joint surface 84b is joined to the housing side joint surface 76b. The case side reference surface 84c contacts the housing side reference surface 76c. The case side reference surface 84c has notches 84d and 84e at the center of the upper side and the center of the lower side. The tip 76 of the connecting portion 75 is prone to weld lines at the center of its width direction (Y direction). Therefore, by providing a notch in the center of the upper side and the center of the lower side of the case-side reference surface 84c, even if a bulge occurs due to a weld line in the center of the upper side and the center of the lower side of the housing-side reference surface 76c, the bulge can be prevented from contacting the case-side reference surface 84c. Therefore, the housing-side reference surface 76c and the case-side reference surface 84c can be properly contacted, and the housing 70 and the case 80 can be properly joined.

[0049] In addition, the lower surface 77b of the top plate portion 77 is disposed higher than the upper surface 72a of the upper wall portion 72. This increases the size of the connecting portion 75 in the vertical direction, and increases the size of the tip portion 76 of the connecting portion 75. This increases the size of the housing side joint surface 76b and the case side joint surface 84b, enabling the housing 70 and the case 80 to be joined more firmly.

[0050] The case 80 integrally includes a case body 81 in the shape of a rectangular parallelepiped box and a connector 83 in the shape of an elliptical cylinder. A case-side joint surface 84b and a case-side reference surface 84c are provided on a side wall portion 84 of the case body 81. The connector 83 is provided upright on an upper wall portion 85 connected to the side wall portion 84. A first rib 88 is provided on an outer surface 84f of the side wall portion 84, extending from the case-side reference surface 84c to a connecting portion between the side wall portion 84 and the upper wall portion 85. A second rib 89 is provided between an outer surface 85a of the upper wall portion 85 and an outer peripheral surface 83a of the connector 83. When viewed from above (the axial direction of the connector 83), the first rib 88 and the second rib 89 are arranged to face each other in the horizontal direction with the connector 83 in between. This makes it possible to prevent connector 83 from being tilted relative to case body 81 as the resin hardens when case 80 is injection molded.

[0051] Although the embodiments of the present invention have been described above, the present invention is not limited to these examples. Any addition, deletion, or design change of components by a person skilled in the art to the above-mentioned embodiments, or any combination of features of the embodiments as appropriate, is also included in the scope of the present invention as long as it does not go against the spirit of the present invention. [Explanation of symbols]

[0052] 1...motor valve, 10...valve body, 11...main body, 12...cylindrical portion, 12a...fitting hole, 13...flange portion, 14...valve chamber, 15, 16...flow path, 17...port, 20...can, 30...drive mechanism, 31...magnet rotor, 32...valve stem holder, 32c...female thread, 33...guide bush, 33a...first cylindrical portion, 33b...second cylindrical portion, 33c...male thread, 34...valve stem, 34a...upper end portion, 34b...step portion, 35...support ring, 36...push nut, 37...valve closing spring, 40...valve body, 50...stator unit, 51a, 51b...magnetic transmission member, 60...stator, 60a...inner surface, 61...upper stator, 61a...pole teeth, 62...lower stator, 62a...pole teeth, 63...mold, 64...terminal support portion, 65... terminal, 70... housing, 71... peripheral wall portion, 72... upper wall portion, 72a... upper surface, 73... dome portion, 74... cylindrical portion, 75... connecting portion, 75a... concave surface, 76... tip portion, 76a... housing side opening, 76b... housing side joint surface, 76c... housing side reference surface, 77... top plate portion, 77a... upper surface, 77b... lower surface, 78... convex strip portion, 79... sealing member, 8 0...case, 81...case body, 82...lid, 83...connector, 83a...outer periphery, 84...side wall, 84a...case opening, 84b...case joint surface, 84c...case reference surface, 84d, 84e...notch, 84f...outer surface, 85...upper wall, 85a...outer surface, 86...substrate, 87a, 87b...magnetic sensor, 88...first rib, 89...second rib

Claims

1. A stator unit including a stator, a resin housing that accommodates the stator, and a resin case that is joined to the housing, the housing integrally includes a peripheral wall portion, an upper wall portion connected to the peripheral wall portion, a dome portion protruding upward from the upper wall portion, and a rectangular tubular connecting portion extending laterally, the connecting portion has a tip portion that protrudes laterally from the peripheral wall portion and to which the case is joined, and a flat top plate portion that protrudes upward from the upper wall portion, A convex portion extending from the dome portion to the tip portion is provided at a central portion in a width direction of an upper surface of the top plate portion, The thickness of the central portion in the width direction of the top plate portion is greater than the thickness of both ends in the width direction of the top plate portion, A stator unit, wherein the case has a connector extending upward.

2. The stator unit according to claim 1 , wherein a concave surface extending in the lateral direction is provided at a portion where the upper wall portion and the connecting portion are joined.

3. The tip end of the connecting portion has a rectangular frame-shaped housing side joint surface and a rectangular frame-shaped housing side reference surface arranged so as to surround the housing side joint surface, the case has a rectangular frame-shaped case side joint surface that is joined to the housing side joint surface, and a case side reference surface that is arranged to surround the case side joint surface and is in contact with the housing side reference surface, 3. The stator unit according to claim 1, wherein a notch is provided in a center of an upper side and a center of a lower side of the case side reference surface.

4. The stator unit according to claim 3 , wherein a lower surface of the top plate portion is disposed higher than an upper surface of the upper wall portion.

5. The case integrally includes a box-shaped case body and a cylindrical connector, The case body has a wall portion provided with the case side joint surface and the case side reference surface, The connector is provided upright on another wall portion connected to the one wall portion of the case body, a first rib is provided on an outer surface of the one wall portion and extends from the case side reference surface to a connecting point with the other wall portion; a second rib is provided between an outer surface of the other wall portion and an outer circumferential surface of the connector; 5. The stator unit according to claim 3, wherein the first rib and the second rib are arranged to face each other with the connector therebetween when viewed in an axial direction of the connector.

6. An electric valve having a valve body, a can joined to the valve body, and a stator unit that houses the can, The stator unit according to any one of claims 1 to 5, wherein the stator unit is a stator unit for a motor-operated valve.

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