Stator unit and motor-operated 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 arranged inside a can. A magnetic sensor is arranged outside the can. This motor-operated valve detects the magnetism of the permanent magnet using the magnetic sensor to obtain the rotation angle of the magnet rotor. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2018-179133 Summary of the Invention [Problem to be solved by the invention]

[0004] 16 and 17 show another conventional motor-operated valve 901. Similar to the motor-operated valve of Patent Document 1, the motor-operated valve 901 has a configuration for acquiring the rotation angle of a magnet rotor. The motor-operated valve 901 includes a valve body 910, a stator 960, a housing 970, and a case 980. The housing 970 includes 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 cylindrical shape extending in the horizontal direction (X direction). A tip portion 976 of the connecting portion 975 protrudes horizontally 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 occur in the center of the width direction (Y direction) of the top plate portion 977 of the connecting portion 975. This raises the risk of cracks occurring along the weld line.

[0006] Therefore, an object of the present invention is to provide a stator unit that can suppress 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 object, a stator unit according to one aspect 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 that is 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 having 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, and a convex rib portion that extends from the dome portion to the tip portion is provided in the center of the width direction of the upper surface of the top plate portion.

[0008] According to the present invention, the housing has a connecting portion having a rectangular cylindrical shape extending laterally. The tip of the connecting portion protrudes laterally from the peripheral wall of the housing. The top plate portion 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 top surface of the top plate in the width direction (a direction perpendicular to the extension direction of the connecting portion). This makes the thickness of the center of the top plate in the width direction greater than the thickness of both ends of the top plate in the width direction, making it easier for resin to flow to the center of the top plate in the width direction during injection molding of the housing. Therefore, the resin flows first in the center of the top plate in the width direction, and then spreads to both ends of the top plate in the width direction, preventing the formation of a weld line in the center.

[0009] In the present invention, it is preferable that a concave surface extending in the horizontal direction is provided at a connecting portion between the upper wall portion and the connecting portion, whereby the thickness of the connecting portion is reduced compared to a configuration in which the connecting portion between the upper wall portion and the connecting portion of the housing is raised, thereby suppressing sinking of the resin.

[0010] In the present invention, the tip of the connecting portion preferably has a rectangular frame-shaped housing-side joint surface and a rectangular frame-shaped housing-side reference surface arranged to surround the housing-side joint surface, and the case preferably 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 contacts the housing-side reference surface, and the case-side reference surface preferably has notches at the center of the upper edge and the center of the lower edge. The tip of the connecting portion is prone to weld lines at its widthwise center. Therefore, by providing notches at the center of the upper edge and the center of the lower edge of the case-side reference surface, even if a bulge due to a weld line occurs at the center of the upper edge and the center of the lower edge 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 can properly contact each other, allowing the housing and the case to be properly joined.

[0011] In the present invention, it is preferable that the lower surface of the top plate portion is positioned higher than the upper surface of the upper wall portion. This increases the size of the connecting portion in the vertical direction, thereby increasing the size of the tip end of the connecting portion. This allows the housing-side joining surface and the case-side joining surface to be enlarged, thereby enabling a stronger joining between the housing and the case.

[0012] In the present invention, it is preferable that the case integrally includes 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 provided upright on another wall connected to the one wall of the case body, a first rib is provided on the outer surface of the one wall extending from the case-side reference surface to a point where the one wall connects to the other wall, and 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 across the connector when viewed in the axial direction of the connector. This prevents the connector from tilting relative to the case body as the resin hardens during injection molding of the case.

[0013] To achieve the above object, another aspect of the present invention provides an electrically operated valve including a valve body, a can joined to the valve body, and a stator unit that houses the can, wherein the stator unit is the above-described stator unit. This configuration makes it possible to prevent weld lines from occurring in a housing of the stator unit. [Effects 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 explanation of the drawings]

[0015] [Figure 1] 1 is a front view of a motor-operated valve according to an embodiment of the present invention. [Figure 2] FIG. 2 is a right side view of the motor-operated valve of FIG. 1. [Figure 3] FIG. 2 is a rear view of the motor-operated valve of FIG. 1. [Figure 4] FIG. 2 is a left side view of the motor-operated valve of FIG. 1. [Figure 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. 1. [Figure 7] FIG. 2 is a longitudinal sectional view of the motor-operated valve of FIG. 1. [Figure 8] FIG. 8 is a cross-sectional view taken along line VIII-VIII in FIG. 7. [Figure 9] 2 is a perspective view of the motor-operated valve of FIG. 1 as viewed from the upper right front side. [Figure 10] 2 is a perspective view of the motor-operated valve of FIG. 1 as viewed from the lower front left. [Figure 11] 2 is a perspective view of the motor-operated valve of FIG. 1 as seen from the upper left rear side. FIG. [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. FIG. [Figure 14] 2 is a perspective view of a stator included in a stator unit of the motor-operated valve of FIG. 1. FIG. [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. FIG. [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 INVENTION

[0016] A motor-operated valve according to one embodiment of the present invention will now 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 line VIII-VIII of FIG. 7. In FIG. 8, the internal configuration of the can is omitted. FIG. 9 is a perspective view of the electric valve of FIG. 1 as seen from the upper right front. FIG. 10 is a perspective view of the electric valve of FIG. 1 as seen from the lower left front. FIG. 11 is a perspective view of the electric valve of FIG. 1 as seen from the upper left rear. FIG. 12 is a perspective view of the electric valve of FIG. 1 as seen from the lower left rear. FIG. 13 is a perspective view of a stator and a housing included in a stator unit of the electric valve of FIG. 1. FIG. 14 is a perspective view of a stator included in a stator unit of the electric valve of FIG. 1. FIG. 15 is a perspective view of a case main body and a connector included in the stator unit of the electric valve of FIG. 1. In each figure, the X direction is the left-right direction (lateral direction), the Y direction is the front-to-back direction, and the Z direction is the up-down direction (axis L direction).

[0018] As shown in each figure, the motor-operated valve 1 includes 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 13.

[0021] The drive mechanism 30 moves the valve element 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 north poles and a plurality of south poles are provided on the outer peripheral surface of the magnet rotor 31. The plurality of north poles and a plurality of south poles extend in the vertical direction and are arranged alternately at equal intervals in the circumferential direction.

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

[0024] The guide bush 33 integrally has 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. The outer peripheral surface of the second cylindrical portion 33b is provided with a male thread 33c that is threadedly engaged with the female thread 32c of the valve stem 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 stem 34 has a cylindrical shape. An upper end 34a of the valve stem 34 passes through the valve stem holder 32. A push nut 36 is attached to the upper end 34a of the valve stem 34 to prevent it from coming off. The valve stem 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 stem holder 32 and the step portion 34b of the valve stem 34. The valve-closing spring 37 is a compression coil spring. The valve-closing spring 37 presses the valve stem 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 stator 61 and the lower stator 62 are arranged one above the other. The upper stator 61 has a plurality of claw-pole-type pole teeth 61a arranged at equal intervals in the circumferential direction. The lower 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 stator 61 and the lower stator 62. The mold 63, together with the plurality of pole teeth 61a, 62a, forms the inner circumferential surface 60a of the stator 60. The mold 63 has a terminal support portion 64.

[0030] The terminal support portions 64 are arranged to extend in the horizontal direction (X direction) from the upper-stage stator 61 and the lower-stage stator 62. The terminal support portions 64 support 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 the coils of the upper-stage stator 61 and the lower-stage stator 62.

[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 arranged to surround the cylindrical portion 12 of the valve body 10. A ring-shaped sealing member 79 is arranged 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 cylindrical shape extending in the horizontal direction (X direction). A tip portion 76 of the connecting portion 75 protrudes horizontally 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 disposed 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 disposed so as to surround the housing-side joint surface 76b. The housing-side reference surface 76c is disposed closer to the peripheral wall portion 71 than the housing-side joint surface 76b. The terminal support portion 64 of the stator 60 and a plurality of terminals 65 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 the 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 located in the center of the top 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 located above the upper surface 72a of the upper wall portion 72. The thickness of the center of the width direction of the top plate portion 77 (where the convex rib portion 78 is located) 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 main body 81, a lid 82, and a connector 83. The case main body 81 has a rectangular parallelepiped box shape with one side open. The lid 82 has a flat plate shape and is arranged so as to close the opening on the side of the case main body 81. The connector 83 has a cylindrical shape with an elliptical cross section. The connector 83 is arranged so as to extend upward from the case main body 81. The case main body 81 and the connector 83 are integrally formed.

[0037] The case body 81 houses a circuit board 86. The circuit board 86 is a printed circuit board on which electronic components are mounted. Magnetic sensors 87a and 87b are mounted on the circuit board 86. In addition to the magnetic sensors 87a and 87b, a microcomputer or the like may also be mounted on the circuit board 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 circuit board 86.

[0038] A side wall 84 (one wall) of the case main body 81 faces the lid 82. The side wall 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, or an adhesive. 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 71 than the case-side joint surface 84b. Notches 84d and 84e are provided in the center of the upper edge and the center of the lower edge of the case-side reference surface 84c. The case-side reference surface 84c contacts the housing-side reference surface 76c.

[0039] The top wall 85 (other wall) of the case main body 81 is connected to the upper end of the side wall 84. A connector 83 is erected on the top 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 edge of the case-side reference surface 84c to a connecting point between the side wall 84 and the top wall 85. A second rib 89 is provided between the outer surface 85a of the top wall 85 and the outer peripheral surface 83a of the connector 83. The second rib 89 has a plate shape that forms a right triangle when viewed from the front. The first rib 88 and the second rib 89 are arranged to face each other laterally 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 magnetic fields of the north and south poles 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 their axes aligned with the axis L.

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

[0043] 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 one direction. The valve stem holder 32 rotates together with the magnet rotor 31. The valve stem holder 32 moves downward due to the screw feed action between the female thread 32c of the valve stem holder 32 and the male thread 33c of the guide bush 33. The valve stem 34 also moves downward together with the valve 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 valve stem holder 32 rotates together with the magnet rotor 31. The valve stem holder 32 moves upward due to the screw feed action between the female thread 32c of the valve stem holder 32 and the male thread 33c of the guide bush 33. The valve stem 34 also moves upward together with the valve stem holder 32, and the valve element 40 opens the port 17 (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 connecting portion 75 that has a rectangular cylindrical shape and 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 end 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 widthwise 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 widthwise ends of the top plate portion 77, thereby preventing the formation of a weld line in the central portion.

[0047] Furthermore, a concave surface 75a extending laterally is provided at the connecting portion between upper wall portion 72 of housing 70 and connecting portion 75. This reduces the thickness of the connecting portion compared to a configuration in which the connecting portion between upper wall portion 72 and connecting portion 75 is raised, thereby suppressing sinking of the resin.

[0048] Furthermore, 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 that is 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 that is 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 is in contact with the housing-side reference surface 76c. Notches 84d and 84e are provided in the center of the upper edge and the center of the lower edge of the case-side reference surface 84c. The tip 76 of the connecting portion 75 is prone to weld lines in its center in the width direction (Y direction). Therefore, by providing notches in the center of the upper edge and the center of the lower edge of the case-side reference surface 84c, even if a bulge occurs in the center of the upper edge and the center of the lower edge of the housing-side reference surface 76c due to a weld line, the bulge can be prevented from contacting the case-side reference surface 84c. As a result, the housing-side reference surface 76c and the case-side reference surface 84c come into proper contact, allowing the housing 70 and the case 80 to be properly joined.

[0049] Furthermore, 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 makes it possible to enlarge the tip portion 76 of the connecting portion 75. This allows the housing-side joining surface 76b and the case-side joining surface 84b to be enlarged, enabling the housing 70 and the case 80 to be joined more firmly.

[0050] The case 80 integrally includes a rectangular parallelepiped box-shaped case main body 81 and an elliptical cylindrical connector 83. A side wall 84 of the case main body 81 is provided with a case-side joint surface 84b and a case-side reference surface 84c. The connector 83 is provided upright on an upper wall 85 connected to the side wall 84. A first rib 88 is provided on an outer surface 84f of the side wall 84, extending from the case-side reference surface 84c to a location where the side wall 84 and the upper wall 85 are connected. A second rib 89 is provided between an outer surface 85a of the upper wall 85 and an outer peripheral surface 83a of the connector 83. When viewed from above (in 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 prevents the connector 83 from tilting relative to the case body 81 as the resin hardens during injection molding of the case 80.

[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-described embodiments, or any combination of features of the embodiments, is also included within the scope of the present invention as long as it does not deviate from the spirit of the present invention. [Explanation of symbols]

[0052] 1...motor valve, 10...valve body, 11...main body portion, 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 peripheral surface, 61...upper stage stator, 61a...pole teeth, 62...lower stage 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 joining surface, 76c...housing side reference surface, 77...top plate portion, 77a...upper surface, 77b...lower surface, 78...protruding portion, 79...sealing member, 8 0...case, 81...case body, 82...lid body, 83...connector, 83a...outer peripheral surface, 84...side wall portion, 84a...case side opening, 84b...case side joining surface, 84c...case side reference surface, 84d, 84e...notch, 84f...outer surface, 85...upper wall portion, 85a...outer surface, 86...board, 87a, 87b...magnetic sensor, 88...first rib, 89...second rib

Claims

1. A stator unit having a stator, a resin housing that accommodates the stator, and a resin case connected to the housing, the housing has 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 is connected to the case, and a flat top plate portion that protrudes upward from the top wall portion, A stator unit characterized in that a protruding ridge portion extending from the dome portion to the tip portion is provided on an upper surface of the top plate portion.

2. A stator unit as described in claim 1, wherein the upper end of the case is positioned above the convex rib portion.

3. The stator unit according to claim 1 , wherein a concave surface extending in the lateral direction is provided at a connection point between the upper wall portion and the connecting portion.

4. The case has a box-shaped case body and a cylindrical connector, the case body has a case side wall portion connected to the tip portion and a case upper wall portion connected to the case side wall portion, the connector extends upward from the upper wall of the case, The stator unit according to claim 1 , wherein a first rib is provided on an outer surface of the case side wall portion, the first rib extending from the tip end portion to the case upper wall portion.

5. A second rib is provided between the upper surface of the upper wall portion of the case and the outer peripheral surface of the connector, 5. The stator unit according to claim 4, wherein the first rib and the second rib are arranged to face each other across the connector when viewed in the 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, An electrically operated valve, wherein the stator unit is the stator unit according to any one of claims 1 to 5.

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