Stator unit, method for manufacturing stator unit, and electric valve

Abstract

A stator unit with high fixing strength, a method for manufacturing the stator unit, and an electric valve are provided. The stator unit (100) includes a stator body (10) and a mounting portion (50) for mounting the stator body (10) to the electric valve body. The stator body (10) has: an inner mold portion that includes a stator assembly having a stator yoke and a stator coil; and an outer mold portion that covers the inner mold portion and a portion of the mounting portion (50). The mounting portion (50) has a locking portion (51) that engages with the electric valve body and a plate-shaped base portion (52) that supports the locking portion (51). The base portion (52) has a first supported surface on its outer side and a second supported surface on its inner side. The first supported surface and the second supported surface are exposed from the outer mold portion.

Description

Technical Field

[0001] This disclosure relates to a stator unit, a method for manufacturing the stator unit, and an electric valve. Background Technology

[0002] A method for manufacturing a stator unit is known in which a stator assembly in which a bobbin wound with a stator coil is mounted on a stator yoke and a power supply terminal for supplying power to the bobbin are formed by an inner mold, and after the inner mold is formed, an outer mold is formed in such a way that it covers the outer periphery of the inner mold (for example, Patent Document 1).

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2018-164398 Summary of the Invention

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

[0007] As a structure for mounting the stator body, which is formed by inner and outer molding, onto the valve body, there is a known structure in which a mounting plate fixed to the stator body side is fixed to the valve body side by means of thread fastening, resin-based welding, etc.

[0008] However, in the case of threaded fastening via mounting plate or resin-based welding, screw receiving parts or welding parts need to be provided on the stator body, which presents a technical problem of increasing the size of the stator body in order to ensure sufficient fixing strength.

[0009] The purpose of this disclosure is to provide a stator unit with high fixing strength, a method for manufacturing the stator unit, and an electric valve.

[0010] Technical means for solving technical problems

[0011] One aspect of the stator unit disclosed herein includes a stator body and a mounting portion for mounting the stator body to an electric valve body.

[0012] The stator body has:

[0013] The inner mold portion includes a stator assembly having a stator yoke and stator coils; and

[0014] The outer mold portion covers a portion of the inner mold portion and the mounting portion.

[0015] The mounting portion has an engaging portion that engages with the electric valve body and a plate-shaped base that supports the engaging portion.

[0016] The base has a first supported surface on the outer side and a second supported surface on the inner side.

[0017] The first supported surface and the second supported surface are exposed from the outer mold portion.

[0018] A method for manufacturing a stator unit according to one aspect of this disclosure includes: a stator body comprising a stator assembly having a stator yoke and stator coils; and a mounting portion having an engagement portion engaging with an electric valve body and a plate-shaped base supporting the engagement portion, wherein the stator body is mounted on the electric valve body.

[0019] The manufacturing method includes:

[0020] The inner molding process involves molding the interior of the stator assembly to form an inner mold portion containing the stator assembly; and

[0021] In the outer molding process, after the inner molding process, the outer mold portion is formed by molding in a manner that covers part of the inner mold portion and part of the mounting portion.

[0022] In the outer molding process, the outer support portion supports a first supported surface located on the outer side of the base, and the inner support portion supports a second supported surface located on the inner side of the base.

[0023] The stator body, comprising the inner mold portion and the outer mold portion, is formed through the outer molding process.

[0024] An electric valve according to one aspect of this disclosure includes a stator body, an electric valve body, and a mounting portion for mounting the stator body to the electric valve body.

[0025] The stator body has:

[0026] The inner mold portion includes a stator assembly having a stator yoke and stator coils; and

[0027] The outer mold portion covers a portion of the inner mold portion and the mounting portion.

[0028] The electric valve body has a locking part.

[0029] The mounting portion has an engaging portion that engages with the engaged portion and a plate-shaped base that supports the engaging portion.

[0030] The base has a first supported surface on the outer side and a second supported surface on the inner side.

[0031] The first supported surface and the second supported surface are exposed from the outer mold portion.

[0032] Invention Effects

[0033] According to this disclosure, a stator unit with high fixing strength, a method for manufacturing the stator unit, and an electric valve can be provided. Attached Figure Description

[0034] Figure 1 This is a perspective view of the stator unit according to the first embodiment of this disclosure.

[0035] Figure 2 This is a cross-sectional view of the electric valve according to the first embodiment of this disclosure.

[0036] Figure 3 This is a perspective view of the mounting section of the first embodiment of this disclosure, viewed from the bottom side.

[0037] Figure 4 This is a bottom view of the stator unit of the first embodiment of this disclosure.

[0038] Figure 5 This is a perspective view of the mounting section of the second embodiment of this disclosure, viewed from the bottom side.

[0039] Figure 6 This is a cross-sectional view of the electric valve according to the third embodiment of this disclosure.

[0040] Figure 7 This is a perspective sectional view showing the state in which the mounting part is mounted on the lower mold and the core of the outer mold forming mold according to the first embodiment of the present disclosure.

[0041] Figure 8 This is a cross-sectional view showing the state in which the stator unit, before the outer mold is formed, is mounted on the mold for forming the outer mold according to the first embodiment of this disclosure. Detailed Implementation

[0042] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. It should be noted that, for ease of explanation, configurations having the same reference numerals as those already described are omitted from the description of the embodiments. Furthermore, the dimensions of the components shown in these drawings may sometimes differ from the actual dimensions of the components for ease of explanation. Additionally, in the following description of the embodiments, the directions of up, down, left, right, front, and rear indicate... Figures 1-8 The directions within the paper are represented by U, D, L, R, F, and B, respectively, but this does not constitute an explanation for limiting the scope of the technology disclosed herein.

[0043] <Stator Unit and Electric Valve>

[0044] <First Implementation>

[0045] Figure 1 This is a perspective view of the stator unit 100 according to the first embodiment of this disclosure. Figure 2 This is a cross-sectional view of the electric valve 1 according to the first embodiment of this disclosure, showing that... Figure 1The stator unit 100 shown is mounted on the valve body 60 (also referred to as the electric valve body). Furthermore, Figure 2 This shows the closed state of valve body 22.

[0046] like Figure 1 As shown, the stator unit 100 includes a stator body 10 and a mounting portion 50. The stator body 10 is a cylindrical component with a circular bottom surface 25A. The mounting portion 50 is, for example, a metal component, having a base 52 and a locking portion 51. Figure 2 As shown, the mounting part 50 can mount the stator body 10 onto the valve body 60 via the engaging part 51.

[0047] like Figure 1 As shown, the base 52 is, for example, annular, and a portion of the base 52 is mounted inside the stator body 10, with the stator body 10 and the mounting portion 50 being integrated. The outer diameter of the base 52 is larger than the diameter of the bottom surface 25A. The engaging portion 51 is a plate-like member extending in the central axis Y direction, cantilevered on the outside of the base 52. The engaging portion 51 has a fixing hole H, through which a screw B is passed and fixed to the slot-shaped engaging portion 61 (see reference) of the valve body 60. Figure 2 ).

[0048] like Figure 2 As shown, the stator body 10 has an outer mold portion 25, and inside the outer mold portion 25 are an inner mold portion 24, a rotor 14, a valve shaft 15, a support member 16, a rotor support portion 17, a planetary gear mechanism 18, a threaded drive member 20, and a housing 23.

[0049] The inner mold portion 24 includes a stator assembly 13 and power supply terminals 19. The stator assembly 13 has multiple stator yokes 13Y and stator coils 13C disposed inside each stator yoke 13Y. The inner mold portion 24 is a part of the stator assembly 13 and a portion of the power supply terminals 19 that are integrally molded using a first molding resin 24M. The inner mold portion 24 and the housing 23 are covered by an outer mold portion 25 formed of a second molding resin 25M. Furthermore, a portion of the base 52 of the mounting portion 50 is covered by the outer mold portion 25. That is, the stator body 10 and the mounting portion 50 are integrated, thereby improving the fixing strength of the mounting portion 50. In addition, the first molding resin 24M and the second molding resin 25M can be the same resin material or different resin materials.

[0050] The stator assembly 13 and rotor 14 constitute the motor 12. The motor 12 is, for example, a stepper motor. The rotor 14 is rotatably disposed inside the stator assembly 13. The valve shaft 15 is connected to the rotor 14 and disposed inside the rotor 14. The support member 16 supports the upper end of the valve shaft 15. The rotor 14 is controlled to rotate about the central axis Y by flowing drive current from the control board (not shown) to the stator coil 13C via the power supply terminal 19. The torque of the rotor 14 is transmitted to the planetary gear mechanism 18 via the rotor support 17. The rotor 14, valve shaft 15, support member 16, rotor support 17, and planetary gear mechanism 18 are disposed inside the housing 23.

[0051] The planetary gear mechanism 18 is a speed reduction mechanism that reduces the rotation of the rotor 14 and transmits torque to the threaded drive member 20 located below the planetary gear mechanism 18. The planetary gear mechanism 18 is composed, for example, of a fixed gear ring, a sun gear, multiple planet gears, a gear carrier, an output gear, and an output shaft. In this embodiment, the sun gear is integrally provided in the rotor support portion 17.

[0052] The threaded drive component 20 uses the torque transmitted from the planetary gear mechanism 18 as a power source, and is linearly driven in the Y direction by the transmission mechanism 21. A valve body 22 is connected to the lower end of the threaded drive component 20. The linear drive of the threaded drive component 20 is transmitted to the valve body 22 via the ball joint 31 and the spring receiving component 32.

[0053] The valve body 60 internally includes a valve chamber 62, an inflow passage 63 for fluid to flow into the valve chamber 62, and an outflow passage 64 for fluid to flow out. A valve seat 65 is formed at the upper end of the opening of the inflow passage 63 into the valve chamber 62.

[0054] The valve body 22 is driven along the central axis Y direction, opening and closing the outflow passage 64 by sitting or leaving the valve seat 65. Therefore, fluid flowing in from the inflow passage 63 flows through the valve chamber 62 to the outflow passage 64 when the valve body 22 is in the open state, and remains in the valve chamber 62 when the valve body 22 is in the closed state, preventing it from flowing out of the outflow passage 64. A compression helical spring S is provided below the spring receiving member 32, and by applying force to the valve body 22 through the spring receiving member 32, it can be reliably pushed to the open state during valve opening operation.

[0055] <Installation section of the first embodiment>

[0056] Figure 3 This is a perspective view of the mounting section 50 of the first embodiment of this disclosure, viewed from the bottom side. Figure 4 This is a bottom view of the stator unit 100 according to the first embodiment of this disclosure.

[0057] like Figure 2 ,3 As shown, the base 52 is a plate-shaped component having an upper surface 52A (also called a first surface) opposite to the stator assembly 13, and a lower surface 52B (also called a second surface) that is the side opposite to the upper surface 52A. Furthermore, in Figure 3 In the image, an upper surface 52A is shown below the mounting portion 50, and a lower surface 52B is shown above the mounting portion 50. The base 52 has a first supported surface 56A on its outer side and a second supported surface 56B on its inner side. Figure 3 In the example, the base 52 is annular, the first supported surface 56A is located on the outer side of the lower surface 52B in the radial direction, and the second supported surface 56B is located on the inner side of the lower surface 52B in the radial direction. In this case, the first supported surface 56A is referred to as the outer diameter supported surface, and the second supported surface 56B is referred to as the inner diameter supported surface.

[0058] like Figure 4 As shown, with a portion of the base 52 installed inside the stator body 10, the first supported surface 56A protrudes from the outer mold portion 25 to the outside, and the second supported surface 56B protrudes from the outer mold portion 25 to the inside.

[0059] In this way, by molding the plate-shaped mounting portion 50 with the inner and outer sides of the base 52 of the mounting portion 50 exposed, the inner and outer sides of the mounting portion 50 can be supported by the mold during the molding of the outer mold portion 25, which will be described later. Therefore, deformation of the mounting portion 50 caused by the injection pressure of the molding resin can be suppressed, and the fixing strength of the mounting portion 50 can be improved.

[0060] In addition, such as Figure 3 As shown, on the inner periphery of the base 52, a plurality of through portions 54 are provided at approximately equal intervals in the circumferential direction, extending from the upper surface 52A to the lower surface 52B. Figure 3 The through portion 54 shown in the example is a notch shape that is recessed outward in the radial direction. During the molding of the outer mold portion 25, the second molding resin 25M enters the through portion 54, and at the same time the through portion 54 and the second molding resin 25M engage, the stator body 10 and the mounting portion 50 become integrated.

[0061] By providing a through portion 54 in the base 52 of the mounting portion 50, molding resin can be easily injected into the upper surface 52A side (stator assembly 13 side) and the lower surface 52B side (opposite side of stator assembly 13) of the base 52 during the molding of the outer mold portion 25. Therefore, by suppressing the deformation of the mounting portion 50 caused by the injection pressure of the molding resin, the fixing strength of the mounting portion can be improved.

[0062] Furthermore, during the molding of the outer mold portion 25, a second molding resin 25M is injected into the internal space of the through portion 54, thereby restricting the rotation of the mounting portion 50 relative to the outer mold portion 25 about the central axis Y of the stator unit 100. Therefore, the stator body 10 and the mounting portion 50 are fixed relative to each other in their rotational direction about the central axis Y.

[0063] In this way, by providing a through portion 54 in the base 52 of the mounting portion 50, the fixing strength for the rotational direction around the central axis Y of the stator unit 100 can be improved.

[0064] <Installation section of the second embodiment>

[0065] Figure 5 This is a cross-sectional view of the mounting portion 70 according to the second embodiment of this disclosure, viewed from the bottom side. Furthermore, in Figure 5 In the middle, the upper surface 52A is shown on the lower side of the mounting part 50, and the lower surface 52B is shown on the upper side of the mounting part 50.

[0066] like Figure 5 As shown, in the base 52, a plurality of through portions 55 are provided at approximately equal intervals in the circumferential direction, extending from the upper surface 52A to the lower surface 52B. Figure 5 The through portion 55 shown in the example is cylindrical. (And...) Figure 3 Similarly, in the first embodiment shown, during the molding of the outer mold portion 25, the second molding resin 25M enters the through portion 55, and while the through portion 55 engages with the second molding resin 25M, the stator body 10 and the mounting portion 70 become integrated. Therefore, by suppressing the deformation of the mounting portion 70 caused by the injection pressure of the molding resin, the fixing strength of the mounting portion can be improved.

[0067] In addition, with Figure 3 Similarly, in the through portion 54 of the mounting portion 50 shown in the first embodiment, in the through portion 55 of the mounting portion 70, during the molding of the outer mold portion 25, a second molding resin 25M is injected into the internal space of the through portion 55, thereby restricting the rotation of the mounting portion 50 relative to the outer mold portion 25 about the central axis Y of the stator unit 100. Therefore, the stator body 10 and the mounting portion 70 are fixed to each other in the rotational direction about the central axis Y.

[0068] <Electric Valve of the Third Embodiment>

[0069] Figure 6 This is a cross-sectional view of the electric valve 1' according to the third embodiment of this disclosure. The electric valve 1' of the third embodiment is an electric valve assembled using the mounting part 50 of the first embodiment or the mounting part 70 of the second embodiment described above. Furthermore, Figure 6 This shows the closed state of valve body 22.

[0070] like Figure 6 As shown, the stator body 10 has an internal path P formed by the inner side surface 28. A sealing member 29 for sealing the internal path P is disposed within the internal path P. The sealing member 29 has, for example, an annular shape with the central axis Y direction as its central axis, preventing fluid flowing in from the inflow passage 63 from entering the motor 12 side. Here, the area where the internal path P contacts the sealing member 29 is defined as the contact area C. Furthermore, the position of the contact area C in the central axis Y direction is defined as H1, the position of the upper surface 52A of the base 52 of the mounting portion 50 in the central axis Y direction is defined as H2, and the position of the lower surface of the stator assembly 13 in the central axis Y direction is defined as H3.

[0071] like Figure 6 As shown, in the central axis Y direction, the position H1 of the contact area C is located between the position H2 of the upper surface 52A of the base 52 of the mounting portion 50 and the position H3 of the lower surface of the stator assembly 13. Therefore, even if moisture is transferred to the base 52 and penetrates the internal path P, the sealing member 29 located above the base 52 can prevent moisture from entering the stator assembly 13.

[0072] <Manufacturing Method of Stator Unit>

[0073] Next, regarding the manufacturing method of the stator unit 100 of this embodiment, using Figure 7 , 8 Please provide an explanation. Figure 7 This is a perspective cross-sectional view showing the state in which the mounting part 50 of the first embodiment of the present disclosure is mounted on the lower mold 420 and the core part 430 of the outer mold making mold 400. Figure 8 This is a cross-sectional view showing the state in which the mounting part 50 of the first embodiment of the present disclosure and the stator unit 100 before the outer mold is formed are mounted on the outer mold forming mold 400.

[0074] First, in the inner molding process, the stator assembly 13, which has a stator yoke 13Y and a stator coil 13C, and the power supply terminal 19 are mounted on an inner molding mold (not shown). First molding resin 24M is injected to cover the interior of the stator assembly 13 and a portion of the power supply terminal 19, and molding is performed (not shown). Thus, the inner mold portion 24 is formed.

[0075] Next, in the outer molding process following the inner molding process, such as Figure 7 As shown, the mounting part 50 is mounted on the lower mold 420 and the core part 430 of the outer mold making mold 400.

[0076] The lower mold 420 has a groove 420A and an outer support portion 420B for supporting the first supported surface 56A of the base 52. The groove 420A and the outer support portion 420B are positioned adjacent to each other in a direction orthogonal to the central axis Y. The core portion 430 ensures space for mounting the housing 23 and the rotor 14 disposed inside the housing 23 after the outer mold is formed. Furthermore, the core portion 430 is generally cylindrical in shape and has an inner support portion 430B and a stepped portion 430S. The height of the upper surface of the outer support portion 420B is approximately the same as the height of the upper surface of the inner support portion 430B. When the mounting portion 50 is mounted to the lower mold 420 and the core portion 430 of the outer mold forming mold 400, the engaging portion 51 of the mounting portion 50 is inserted into the groove 420A and fitted, so that the first supported surface 56A of the base 52 of the base 52 is supported by the outer support portion 420B. In addition, the inner mold portion 24 is supported on the stepped portion 430S.

[0077] In this way, the outer support portion 420B of the lower mold 420 supports the first supported surface 56A of the mounting portion 50, and the inner support portion 430B of the core portion 430 supports the second supported surface 56B of the mounting portion 50, thereby suppressing the deformation of the mounting portion 50 caused by the injection pressure of the molding resin and improving the fixing strength of the mounting portion 50.

[0078] Next, as Figure 8 As shown, the inner mold portion 24 is mounted on the core portion 430 by supporting the inner mold portion 24 on the stepped portion 430S of the core portion 430. Furthermore, the upper mold 410 is engaged with the lower mold 420, and a sliding pin is slidably mounted on the power supply terminal 19. The upper mold 410 has a gate 410G serving as a resin injection port. The upper mold 410 and the lower mold 420 form a cavity 440 for forming a resin layer around the inner mold portion 24 and the mounting portion 50. The sliding pin P is slidably mounted on the power supply terminal 19, forming a connector portion 33 of the power supply terminal 19.

[0079] With the mounting portion 50 and the inner mold portion 24 mounted on the outer mold 400, a second molding resin 25M is injected into the cavity 440 through the gate 410G. As a result, while forming an outer mold portion 25 that covers a portion of the inner mold portion 24 and the mounting portion 50, a stator body 10 including the inner mold portion 24 and the outer mold portion 25 is formed, and a stator unit 100 integrating the base portion 52 and the stator body 10 is formed.

[0080] In addition, such as Figure 7 As shown, the lower mold 420 may also have a resin inflow passage 420C for the entry of the second molding resin 25M. This allows for the suppression of deformation of the mounting portion 50 caused by the injection pressure of the molding resin.

[0081] The embodiments of this disclosure have been described above. However, it should be noted that the technical scope of this disclosure is not limited by the description of these embodiments. Those skilled in the art should understand that this embodiment is merely an example, and various modifications to the embodiments are possible within the scope of the invention described in the protection scope. The technical scope of this disclosure should be determined based on the scope of the invention described in the protection scope and its equivalents.

[0082] For example, the manufacturing method of the stator unit described above Figure 1 The manufacturing method of the stator unit 100 in the first embodiment shown can also be used as... Figure 6 The method for manufacturing the stator unit 200 of the electric valve 1' shown in the third embodiment is applied. Furthermore, instead of... Figure 3 The mounting part 50 of the first embodiment shown can also be used Figure 5 The mounting section 70 of the second embodiment shown.

[0083] Furthermore, the mounting portion 50 of the first embodiment and the mounting portion 70 of the second embodiment each have eight through portions 54 and 55, but are not limited to that number.

[0084] Furthermore, the base 52 of the mounting portion 50 in the first embodiment of this disclosure and the base 52 of the mounting portion 70 in the second embodiment may also be a C-shape with a missing part of the ring.

[0085] Furthermore, in the embodiments of this disclosure, the valve body 60 (body block) is an integral structure of a block having a valve chamber 62 and a block having an inflow passage 63 and an outflow passage 64, but the block having a valve chamber 62 and the block having an inflow passage 63 and an outflow passage 64 may also be separate structures.

[0086] Furthermore, the electric valves 1 and 1' in the embodiments of this disclosure are electric valves employing a reduction gear mechanism, but they may also be linear electric valves without a reduction gear mechanism.

[0087] Furthermore, the present invention can also be applied to an electric valve consisting of a stator body 10 mounted on a housing 23.

[0088] Explanation of reference numerals in the attached figures

[0089] 1, 1': Electric valve

[0090] 10: Stator body

[0091] 12: Electric motor

[0092] 13: Stator Assembly

[0093] 13Y: Stator yoke

[0094] 13C: Stator coil

[0095] 14: Rotor

[0096] 15: Valve shaft

[0097] 16: Support components

[0098] 17: Rotor support section

[0099] 18: Planetary gear mechanism

[0100] 19: Power supply terminal

[0101] 20: Drive components

[0102] 21: Transmission mechanism

[0103] 22: Valve body

[0104] 23: Shell

[0105] 24: Inner mold section

[0106] 24M: First molding resin

[0107] 25: External mold department

[0108] 25A: Bottom surface

[0109] 25M: Second molding resin

[0110] 31: Ball joint

[0111] 32: Spring bearing component

[0112] 33: Connector Section

[0113] 50, 70: Installation Department

[0114] 51: Card-connecting section

[0115] 52: Base

[0116] 52A: Upper surface

[0117] 52B: Lower surface

[0118] 54, 55: Through section

[0119] 56A: First supported surface

[0120] 56B: Second supported surface

[0121] 60: Valve body

[0122] 61: The part that was stuck

[0123] 62: Valve chamber

[0124] 63: Inflow Channel

[0125] 64: Outflow pathway

[0126] 65: Valve seat

[0127] 100, 200: Stator unit

[0128] 400: Mold for making outer molds

[0129] 410: Upper mold

[0130] 410G: Gate

[0131] 420: Lower mold

[0132] 420A: Channel section

[0133] 420B: Outer support section

[0134] 420C: Resin inflow channel

[0135] 430: Core

[0136] 430B: Inner support section

[0137] 430S: Stepped Section

[0138] 440: Chamber

[0139] P: Sliding pin

Claims

1. A stator unit comprising a stator body and a mounting portion for mounting the stator body to an electric valve body. The stator body has: The inner mold portion includes a stator assembly having a stator yoke and stator coils; and The outer mold portion covers a portion of the inner mold portion and the mounting portion. The mounting portion has an engaging portion that engages with the electric valve body and a plate-shaped base that supports the engaging portion. The base has a first supported surface on the outer side and a second supported surface on the inner side. The first supported surface and the second supported surface are exposed from the outer mold portion.

2. The stator unit according to claim 1, The base is ring-shaped. The first supported surface is the outer diameter supported surface located on the outer side in the radial direction. The second supported surface is the inner diameter supported surface located inside the radial direction.

3. The stator unit according to claim 2, The base has a first surface opposite to the stator assembly and a second surface that is the side opposite to the first surface. The second surface includes the outer diameter supported surface and the inner diameter supported surface.

4. The stator unit according to claim 1, The base has a through portion into which the outer mold portion enters.

5. The stator unit according to claim 4, The stator body is cylindrical in shape. The through section restricts the rotation of the outer mold section about the central axis of the stator body.

6. The stator unit according to claim 4, The through section is either notched or cylindrical.

7. The stator unit according to claim 1, The stator body is cylindrical in shape and has an internal path formed by its inner side surface, and a sealing component that seals the internal path. In the direction of the central axis of the stator body, the contact area between the inner side and the sealing member is located between the stator assembly and the base.

8. A method for manufacturing a stator unit, the stator unit comprising: The stator body includes a stator assembly having a stator yoke and stator coils; The mounting portion includes a locking part that engages with the electric valve body and a plate-shaped base that supports the locking part, and mounts the stator body onto the electric valve body. The manufacturing method includes: The inner molding process involves molding the interior of the stator assembly to form an inner mold portion containing the stator assembly. as well as In the outer molding process, after the inner molding process, the outer mold portion is formed by molding in a manner that covers part of the inner mold portion and part of the mounting portion. In the outer molding process, the outer support portion supports a first supported surface located on the outer side of the base, and the inner support portion supports a second supported surface located on the inner side of the base. The stator body, comprising the inner mold portion and the outer mold portion, is formed through the outer molding process.

9. An electric valve comprising a stator body, an electric valve body, and a mounting portion for mounting the stator body to the electric valve body. The stator body has: The inner mold portion includes a stator assembly having a stator yoke and stator coils; and The outer mold portion covers a portion of the inner mold portion and the mounting portion. The electric valve body has a locking part. The mounting portion has an engaging portion that engages with the engaged portion and a plate-shaped base that supports the engaging portion. The base has a first supported surface on the outer side and a second supported surface on the inner side. The first supported surface and the second supported surface are exposed from the outer mold portion.

Images