Electric valve and method for manufacturing the same

Abstract

To provide an electrically operated valve that operates with high precision while keeping costs down, and a method for manufacturing the same. [Solution] In an electric valve, the planetary gear type reduction mechanism includes a sun gear that rotates around a shaft member to which rotational force from a rotor is transmitted, planetary gears that mesh with the sun gear, a carrier that rotatably supports the planetary gears, and an output gear member 65 that meshes with the planetary gears and has a first engagement hole 65a. The output shaft has a second engagement hole 29d and a notch 29f that extends from the axial end and communicates the inside and outside of the second engagement hole. When the output shaft is fitted into the first engagement hole of the output gear member, the second engagement hole is located radially inward of the first engagement hole. When the shaft member is fitted into the second engagement hole, the output shaft is deformed by being pressed by the shaft member, causing the outer circumference of the output shaft to come into close contact with the inner circumference of the first engagement hole.

Description

Technical Field

[0001] The present invention relates to an electric valve and a method for manufacturing the same.

Background Art

[0002] For example, in the motor-driven electric valve shown in Patent Document 1, a valve shaft connected to a rotor of a stepping motor is displaced in the axial direction as the rotor rotates by the action of a screw feed mechanism formed by screwing a male screw portion and a female screw portion, thereby increasing or decreasing the gap between the valve body and the valve seat to control the flow rate.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Here, the electric valve shown in Patent Document 1 has a planetary gear mechanism as a speed reduction mechanism for reducing the rotation of the rotor of the stepping motor, and a conversion mechanism for converting the rotation of the output shaft into axial movement. The output shaft is fitted into the central hole of the output gear of the planetary gear mechanism, and both can rotate integrally. Here, if the output gear is made of resin with excellent moldability and the output shaft is made of metal with excellent durability, the fitting may loosen due to differences in thermal expansion of the materials caused by changes in environmental temperature, resulting in relative rotation between the output gear and the output shaft, and thus there is a risk that power cannot be transmitted accurately.

[0005] In response to this, one option is to mold the output gear and output shaft as a single integrated part using insert molding, which would also prevent relative rotation between the output gear and output shaft. However, there are cases where it is required to change the output shaft depending on the specifications of the electric valve, and in such cases, using a common output gear can promote cost reduction. Therefore, in reality, it is desirable to manufacture the output gear and output shaft as separate parts.

[0006] This invention has been made in view of the above problems, and aims to provide an electric valve that operates with high precision while keeping costs down, and a method for manufacturing the same. [Means for solving the problem]

[0007] The electric valve of the present invention is A valve body having a valve seat, A motor having a rotor, A planetary gear type reduction mechanism that reduces the rotation of the rotor and transmits it to the output shaft, A valve body that is movable in the axial direction toward and toward the valve seat, A conversion mechanism that converts the rotational movement of the output shaft into axial movement of the valve body, In an electric valve equipped with, The aforementioned planetary gear type reduction mechanism is The rotational force from the rotor is transmitted to a sun gear that rotates around the shaft member, A planetary gear that meshes with the aforementioned sun gear, A carrier that rotatably supports the aforementioned planetary gear, It has an output gear member that has a first engagement hole and meshes with the planetary gear, The output shaft is provided with a second engagement hole and a notch extending from the axial end and communicating the inside and outside of the second engagement hole, and when the output shaft is fitted into the first engagement hole of the output gear member, the second engagement hole is located radially inward of the first engagement hole. The present invention is characterized in that when the shaft member is fitted into the second engagement hole, the output shaft is deformed by being pressed by the shaft member, causing the outer circumference of the output shaft to come into close contact with the inner circumference of the first engagement hole.

[0008] The method for manufacturing an electric valve of the present invention is as follows: A valve body having a valve seat, A motor having a rotor, A planetary gear type reduction mechanism that reduces the rotation of the rotor and transmits it to the output shaft, A valve body that is movable in the axial direction toward and toward the valve seat, A conversion mechanism that converts the rotational movement of the output shaft into axial movement of the valve body, In a method for manufacturing an electric valve equipped with, The aforementioned planetary gear type reduction mechanism is The rotational force from the rotor is transmitted to a sun gear that rotates around the shaft member, A planetary gear that meshes with the aforementioned sun gear, A carrier that rotatably supports the aforementioned planetary gear, It has an output gear member that has a first engagement hole and meshes with the planetary gear, The output shaft is provided with a second engagement hole and a notch extending from the axial end and communicating the inside and outside of the second engagement hole. The output shaft is fitted into the first engagement hole of the output gear member, and the second engagement hole is positioned radially inward of the first engagement hole. By fitting the shaft member into the second engagement hole, the shaft member deforms the output shaft, causing the outer circumference of the output shaft to come into close contact with the inner circumference of the first engagement hole. It is characterized by the following: [Effects of the Invention]

[0009] According to the present invention, it is possible to provide an electrically operated valve that operates with high precision while keeping costs down, and a method for manufacturing the same. [Brief explanation of the drawing]

[0010] [Figure 1] Figure 1 is a longitudinal cross-sectional view of the electric valve according to this embodiment. [Figure 2] Figure 2 is a longitudinal cross-sectional view of the assembly in which the shaft member, output gear member, and output shaft of this embodiment are assembled. [Figure 3] Figure 3 is a perspective view of the output shaft. [Figure 4] Figure 4 is a front view of the output shaft. [Figure 5] Figure 5 is a plan view of the output shaft. [Figure 6] Figure 6 is a cross-sectional view taken along the line A - A of the output shaft in Figure 5.

Embodiments for Carrying Out the Invention

[0011] Hereinafter, embodiments of the electric valve according to the present invention will be described while referring to the drawings. In this specification, the rotor side with respect to the valve body is described as the upper side, and the valve body side with respect to the rotor is described as the lower side.

[0012] Figure 1 is a longitudinal sectional view of the electric valve 1 according to this embodiment. Figure 2 is a longitudinal sectional view of an assembly in which the shaft member 8, the output gear member 65, and the output shaft 29 of this embodiment are assembled. The electric valve 1 of this embodiment is used, for example, to adjust the refrigerant flow rate in a refrigeration cycle. Let the axis of the electric valve 1 be L.

[0013] <​​​​​​Outside the can 3, the yoke 51, bobbin 52, and stator coil 53 are arranged to form the stator 50, and its outer circumference is covered by a resin molded cover 58. In this embodiment, the resin molded cover 58 covers the entire stator 50, including the top of the can 3, but it may also cover only the area around the yoke 51.

[0015] The stator coil 53 is connected to an external power supply circuit (not shown) via a circuit board CB, a connector CN, and wiring HN. The circuit board CB and connector CN are covered by another resin cover 59. By energizing the stator coil 53, the rotor 57, which is located inside the can 3, can be rotated around its axis L. The resin cover 59 is filled with molded resin MR.

[0016] The valve body 10 consists of a large-diameter circular pipe section 10a surrounding the valve chamber VC and a partition wall 10b formed near the lower end of the large-diameter circular pipe section 10a. An orifice passage OP (also called a valve opening) communicating with the valve chamber VC is formed in the center of the partition wall 10b, and the upper end of the orifice passage OP constitutes the valve seat 18.

[0017] A second pipe P2 is fixed to the opening 12 formed in the side wall of the large-diameter circular pipe section 10a by brazing or the like, so as to communicate with the valve chamber VC. Let the axis of the second pipe P2 be O. The axis O is perpendicular to the axis L.

[0018] The upper outer circumference of the first pipe P1 is fitted into the inner circumference of the circular recess 10c formed on the lower surface of the partition wall 10b and fixed in place by brazing or the like.

[0019] A screw bearing member 13, which has a female threaded portion 13a formed on its lower central end, is fitted into the inner circumference of the thin-walled portion at the upper end of the valve body 10 and fixed to the valve body 10 by press-fitting or the like. A communication hole 10f is formed in the thin-walled portion of the valve body 10, which connects the inside and outside.

[0020] The reduction mechanism 6 comprises a sun gear 61 integrally formed with the rotor support member 56 on the inner circumference side of the rotor 57, a fixed ring gear 62 fixed via a thin-walled cylindrical body 66 fixed to the upper part of the valve body 10, a planetary gear 63 positioned between the sun gear 61 and the fixed ring gear 62 and meshing with each of them, a carrier 64 that rotatably supports the planetary gear 63, and a bottomed cylindrical output gear member 65 having teeth on its inner circumference that mesh with the planetary gear 63. These components constitute a unique planetary gear reduction mechanism. The number of teeth on the fixed ring gear 62 is set to be different from the number of teeth on the output gear member 65.

[0021] The metal shaft member 8 is cylindrical with a substantially uniform outer diameter and passes through the rotor support member 56 and the sun gear 61, which are joined to the upper end of the rotor 57, and holds them rotatably. The upper end of the shaft member 8 is supported by a support member 81 located inside the top of the can 3.

[0022] As shown in Figure 2, a circular opening (first engagement hole) 65a is formed in the center of the bottom wall of the resin output gear member 65. The upper cylindrical portion 29c of the output shaft 29 is press-fitted into the circular opening 65a, and the lower end of the shaft member 8 is press-fitted into the circular opening (second engagement hole) 29d of the output shaft 29. The circular opening 29d is located radially inward of the circular opening 65a. The inner diameter of the circular opening 65a is φB, and the outer diameter of the shaft member 8 is φC.

[0023] Figure 3 is a perspective view of the output shaft 29. Figure 4 is a front view of the output shaft 29. Figure 5 is a plan view of the output shaft 29. Figure 6 is a cross-sectional view AA of the output shaft 29 in Figure 5.

[0024] The output shaft 29, which is made of metal, consists of a lower cylindrical portion 29b and an upper cylindrical portion 29c connected coaxially. A slit groove 29a of equal width is formed along the axis from the lower end of the lower cylindrical portion 29b. A chamfered portion is formed on the outer circumference of the upper end of the upper cylindrical portion 29c, which has a smaller diameter than the lower cylindrical portion 29b.

[0025] The output shaft 29 has a circular opening 29d in the center that extends from the upper end. The circular opening 29d has an opening side portion 29d1 and an inner side portion 29d2. If the inscribed circle diameter of the opening side portion 29d1 is φD and the inner diameter of the inner side portion 29d2 is φF, then φD < φF. For example, when forming the circular opening 29d, first a cylindrical hole including the opening side portion 29d1 is formed by drilling to the bottom with a drill of drill diameter φD, and then the inner side portion 29d2 with an inner diameter φF can be formed by expanding the diameter of everything except the opening side portion 29d1 with an end mill or the like.

[0026] On the outer circumference of the upper cylindrical portion 29c, a plurality of (in this case, 20) raised portions 29e are formed, extending linearly from near the upper end to the lower end. The raised portions 29e have a common shape, are arranged at equal intervals in the circumferential direction, and their cross-section perpendicular to the axis is approximately triangular or trapezoidal. The raised portions 29e constitute a part of the outer circumference of the upper cylindrical portion 29c. A certain gap is formed between the lower end of the raised portions 29e and the upper end of the lower cylindrical portion 29b.

[0027] Furthermore, the upper cylindrical portion 29c has a plurality of (in this case, four) notches 29f extending from its upper end to the boundary between the opening side portion 29d1 and the inner side portion 29d2. That is, the notches 29f are present only on the opening side portion 29d1. The notches 29f have a common shape with respect to each other, connect the inner circumference and outer circumference of the upper cylindrical portion 29c, and are arranged at equal intervals in the circumferential direction, but one or more are sufficient. The notches 29f preferably have an axial length of 1 / 2 or more (preferably 2 / 3 or more) of the upper cylindrical portion 29c, and are rectangular groove-shaped when viewed in the direction perpendicular to the axis. In this case, they overlap with the four raised portions 29e, so the raised portions 29e in the overlapping parts are removed, but the raised portion 29e between the lower end of the notch 29f and the lower end of the upper cylindrical portion 29c remains. However, the notches 29f do not have to overlap with the raised portions 29e. Let φE be the diameter of the circumscribed circle of the raised portion 29e.

[0028] According to this embodiment, the following relationship exists between the output gear member 65, the output shaft 29, and the shaft member 8. φC > φD (1) φB < φE (2) φC ≈ φF (3)

[0029] Referring to Figure 2, the assembly process of the output gear member 65, the output shaft 29, and the shaft member 8 will be described. First, the upper cylindrical portion 29c of the output shaft 29 is press-fitted into the circular opening 65a of the output gear member 65 from below, and the stepped portion of the upper cylindrical portion 29c and the lower cylindrical portion 29b are brought into contact with the lower surface of the output gear member 65. As a result, the circular opening 29d is located radially inward of the circular opening 65a. Here, although the inner diameter φB of the circular opening 65a is smaller than the circumscribed circle diameter φE of the raised portion 29e, the peripheral wall of the upper cylindrical portion 29c is divided into four parts in the circumferential direction by the notches 29f, and the peripheral wall other than the notches 29f is supported in a cantilevered manner. Therefore, even if the output shaft 29 is made of a metal material, it is easily deformable, and as a result, the upper cylindrical portion 29c can be easily inserted into the circular opening 65a. In this specification, "deformation" includes both elastic deformation and plastic deformation.

[0030] Furthermore, because the material of the output gear member 65 is less hard than the material of the output shaft 29, the output gear member 65 and the output shaft 29 are connected with the raised portion 29e biting into the inner circumference of the circular opening 65a.

[0031] Next, as shown by arrow X, the lower end of the shaft member 8 is brought closer from above the output gear member 65, passes through the output gear member 65, and is then pressed into the inner part 29d2 of the circular opening 29d of the output shaft 29. The outer diameter φC of the shaft member 8 is approximately equal to the inner diameter φF of the inner part 29d2, and the shaft member 8 fits into the inner part 29d2 by interference fit.

[0032] On the other hand, because the outer diameter φC of the shaft member 8 is larger than the inscribed circle diameter φD of the opening side portion 29d1, as the shaft member 8 passes through the opening side portion 29d1, the peripheral wall other than the notches 29f is pushed radially outward as shown by arrow Y, and the upper cylindrical portion 29c deforms so that the width of each notch 29f widens. As a result, the raised portion 29e is displaced radially outward and bites even deeper into the inner circumference of the circular opening 65a.

[0033] According to this embodiment, even when the shaft member 8 is pressed into the circular opening 29d with relatively light force, the amount of radial outward displacement of the raised portion 29e can be secured, thereby firmly gripping the inner circumference of the circular opening 65a and effectively preventing relative rotation of the output shaft 29 with respect to the output gear member 65 and preventing axial dislodgement. As will be described later, this effect is particularly effective in a configuration in which the output shaft 29 and the screw drive member 22 rotate together as a unit in response to the rotation of the output gear member 65, and move linearly relative to the valve body 10 along the axis L. However, even when the raised portion 29e is not provided (the outer diameter of the upper cylindrical portion 29c is φE), the lower end of the shaft member 8 can be pressed into the inner side portion 29d2, thereby increasing the surface pressure by making the peripheral wall of the upper cylindrical portion 29c, excluding the notch 29f, tightly adhere to the inner circumference of the circular opening 65a, and thus obtaining the predetermined dislodgement prevention effect.

[0034] Furthermore, by press-fitting the shaft member 8 into the inner portion 29d2, the degree of inclination of the shaft member 8 with respect to the axis L can be suppressed, thereby providing an electric valve 1 with less vibration during operation.

[0035] In Figure 1, the male threaded portion 22a formed on the lower part of the screw drive member 22 is screwed into the female threaded portion 13a of the screw bearing member 13. The rotational movement of the output gear member 65 transmitted from the rotor 57 via the reduction mechanism 6 is converted into linear movement along the axis L by the screw feed mechanism (conversion mechanism) 27 consisting of the male threaded portion 22a and the female threaded portion 13a.

[0036] The output shaft 29 is connected to the screw drive member 22 so that it can rotate integrally with the screw drive member 22 and move relative to it in the axial direction, by sliding the blade 22b formed on the upper end of the screw drive member 22 into the slit groove 29a formed on the lower end of the output shaft 29. Therefore, when the output gear member 65 (rotor 57) rotates, the output shaft 29 and the screw drive member 22 rotate together and move linearly relative to the valve body 10 along the axis L.

[0037] The linear movement of the screw drive member 22 is transmitted to the valve shaft 4 via a ball-shaped joint 25 consisting of a ball 23 and a ball seat 24.

[0038] The valve stem 4 consists of a cylindrical body 4a, a conical valve body 4b at the lower end (valve seat side), and a flange 4c at the upper end, all connected together. The upper end of the body 4a is provided with a fitting hole 4d into which a ball seat 24 is press-fitted. The valve stem 4 is supported by a spring case 19 so as to be displaceable in a direction toward or toward the valve seat 18.

[0039] The cylindrical spring case 19, positioned around the valve stem 4, comprises an enlarged diameter portion 19a, a reduced diameter portion 19b, and an upper flange portion 19c extending radially outward from the upper end of the enlarged diameter portion 19a. The upper flange portion 19c engages with the inner circumferential step portion of the valve body 10 and is clamped and fixed between it and the lower end of the screw bearing member 13. The reduced diameter portion 19b slidably holds the outer circumference of the body 4a.

[0040] The compression coil spring 26 is positioned in a compressed state, with its lower end abutting against the stepped portion between the case's enlarged diameter portion 19a and the case's reduced diameter portion 19b, and its upper end engaging with the flange portion 4c of the valve stem 4, thereby constantly biasing the valve stem 4 in the valve-opening direction.

[0041] (Operation of the electric valve) When a valve closing control signal of a predetermined number of pulses is supplied to the stator 50 from a control device (not shown), causing the rotor 57 of the stepping motor to rotate in one direction, the rotational speed is input from the sun gear 61 to the reduction mechanism 6, and the rotational speed reduced by the reduction mechanism 6 is then transmitted to the screw drive member 22 via the output shaft 29. When the screw drive member 22 rotates in one direction, the female screw portion 13a and the male screw portion 22a screw relative to each other, and the screw drive member 22 moves downward in the direction of the axis L according to the rotational speed. The thrust of this screw drive member 22 is transmitted to the valve shaft 4 via the ball joint 25, and the valve shaft 4 descends while compressing the compression coil spring 26, causing the valve body portion 4b to seat on the valve seat 18 and the orifice passage OP to close. As a result, the flow of refrigerant is interrupted between the second pipe P2 and the first pipe P1 with the valve chamber VC in between.

[0042] On the other hand, by supplying an opening control signal to the stator 50 from a control device (not shown), the rotor 57 of the stepping motor is driven to rotate in the opposite direction. This causes the screw drive member 22 to move upward in the direction of axis L via the reduction mechanism 6 and the screw feed mechanism 27. As a result, when the valve stem 4 rises in accordance with the elastic force of the compression coil spring 26, the valve body 4b separates from the valve seat 18 and the orifice passage OP opens. This causes the refrigerant to flow from the second pipe P2 through the valve chamber VC to the first pipe P1.

[0043] It should be noted that the specific configuration of the electric valve is not limited to the embodiments described above, and any design changes that do not depart from the spirit of the present invention are also included in the present invention. For example, in this embodiment, multiple linear protrusions are formed on the outer circumference of the output shaft 29, but instead, annular or spiral protrusions that are continuous in the circumferential direction may be formed, or a number of small hemispherical or truncated pyramidal protrusions may be arranged in the axial and circumferential directions.

[0044] This specification includes disclosures of the following inventions. (First aspect) A valve body having a valve seat, A motor having a rotor, A planetary gear type reduction mechanism that reduces the rotation of the rotor and transmits it to the output shaft, A valve body that is movable in the axial direction toward and toward the valve seat, A conversion mechanism that converts the rotational movement of the output shaft into axial movement of the valve body, In an electric valve equipped with, The aforementioned planetary gear type reduction mechanism is The rotational force from the rotor is transmitted to a sun gear that rotates around the shaft member, A planetary gear that meshes with the aforementioned sun gear, A carrier that rotatably supports the aforementioned planetary gear, It has an output gear member that has a first engagement hole and meshes with the planetary gear, The output shaft is provided with a second engagement hole and a notch extending from the axial end and communicating the inside and outside of the second engagement hole, and when the output shaft is fitted into the first engagement hole of the output gear member, the second engagement hole is located radially inward of the first engagement hole. When the shaft member is fitted into the second engagement hole, the output shaft is deformed by being pressed by the shaft member, causing the outer circumference of the output shaft and the inner circumference of the first engagement hole to come into close contact. An electric valve characterized by the following features.

[0045] (Second aspect) The second engagement hole has an opening side and an inner side, and the inner diameter of the opening side is smaller than the inner diameter of the inner side. The shaft member is pressed into the inner side after passing through the opening side. An electric valve according to a first embodiment, characterized by the following:

[0046] (Third aspect) Multiple raised portions are formed on the outer circumference of the output shaft, and when the shaft member is fitted into the second engagement hole, the raised portions bite into the inner circumference of the first engagement hole. An electric valve according to the first or second embodiment, characterized by the above.

[0047] (Fourth aspect) The aforementioned raised portion extends linearly along the axial direction of the output shaft. A third embodiment of an electric valve characterized by the following:

[0048] (Fifth aspect) The raised portions are arranged at equal intervals along the circumferential direction of the output shaft. A third or fourth embodiment of an electric valve characterized by the above.

[0049] (Sixth aspect) The notches are arranged at equal intervals along the circumferential direction of the output shaft. An electric valve according to any of the first to fifth embodiments, characterized by the above.

[0050] (Seventh aspect) The output gear member is made of resin, and the output shaft and shaft member are made of metal. An electric valve according to any of the first to sixth embodiments, characterized by the above.

[0051] (Eighth aspect) A valve body having a valve seat, A motor having a rotor, A planetary gear type reduction mechanism that reduces the rotation of the rotor and transmits it to the output shaft, A valve body that is movable in the axial direction toward and toward the valve seat, A conversion mechanism that converts the rotational movement of the output shaft into axial movement of the valve body, In a method for manufacturing an electric valve equipped with, The aforementioned planetary gear type reduction mechanism is The rotational force from the rotor is transmitted to a sun gear that rotates around the shaft member, A planetary gear that meshes with the aforementioned sun gear, A carrier that rotatably supports the aforementioned planetary gear, It has an output gear member that has a first engagement hole and meshes with the planetary gear, The output shaft is provided with a second engagement hole and a notch extending from the axial end and communicating the inside and outside of the second engagement hole. The output shaft is fitted into the first engagement hole of the output gear member, and the second engagement hole is positioned radially inward of the first engagement hole. By fitting the shaft member into the second engagement hole, the shaft member deforms the output shaft, causing the outer circumference of the output shaft to come into close contact with the inner circumference of the first engagement hole. A method for manufacturing an electric valve, characterized by the following: [Explanation of symbols]

[0052] 1. Electric valve 10 Valve body 10a Large diameter circular pipe section 10b Bulkhead 13 Screw bearing member 22 Screw drive member 29 Output shaft 29a Slit groove 29d Circular opening 3 Can 4 Valve stem 50 staters 57 Rotor 6. Planetary gear reduction mechanism 61 Sun Gear 63 Planetary gears 64 carriers 65 Output gear component 8 Shaft member 18 valve seats VC valve chamber P1 First Pipe P2 Second Pipe L axis

Claims

1. A valve body having a valve seat, A motor having a rotor, A planetary gear type reduction mechanism that reduces the rotation of the rotor and transmits it to the output shaft, A valve body that is movable in the axial direction toward and toward the valve seat, A conversion mechanism that converts the rotational movement of the output shaft into axial movement of the valve body, In an electric valve equipped with, The aforementioned planetary gear type reduction mechanism is The rotational force from the rotor is transmitted to a sun gear that rotates around the shaft member, A planetary gear that meshes with the aforementioned sun gear, A carrier that rotatably supports the aforementioned planetary gear, It has an output gear member that has a first engagement hole and meshes with the planetary gear, The output shaft is provided with a second engagement hole and a notch extending from the axial end and communicating the inside and outside of the second engagement hole, and when the output shaft is fitted into the first engagement hole of the output gear member, the second engagement hole is located radially inward of the first engagement hole. When the shaft member is fitted into the second engagement hole, the output shaft is deformed by being pressed by the shaft member, causing the outer circumference of the output shaft and the inner circumference of the first engagement hole to come into close contact. An electric valve characterized by the following features.

2. The second engagement hole has an opening side and an inner side, and the inner diameter of the opening side is smaller than the inner diameter of the inner side. The shaft member is pressed into the inner side after passing through the opening side. The electric valve according to feature 1.

3. Multiple protrusions are formed on the outer circumference of the output shaft, and when the shaft member is fitted into the second engagement hole, the protrusions bite into the inner circumference of the first engagement hole. The electric valve according to feature 1.

4. The aforementioned raised portion extends linearly along the axial direction of the output shaft. The electric valve according to feature 3.

5. The raised portions are arranged at equal intervals along the circumferential direction of the output shaft. The electric valve according to feature 3.

6. The notches are arranged at equal intervals along the circumferential direction of the output shaft. The electric valve according to feature 1.

7. The output gear member is made of resin, and the output shaft and shaft member are made of metal. The electric valve according to feature 1.

8. A valve body having a valve seat, A motor having a rotor, A planetary gear type reduction mechanism that reduces the rotation of the rotor and transmits it to the output shaft, A valve body that is movable in the axial direction toward and toward the valve seat, A conversion mechanism that converts the rotational movement of the output shaft into axial movement of the valve body, In a method for manufacturing an electric valve equipped with, The aforementioned planetary gear type reduction mechanism is The rotational force from the rotor is transmitted to a sun gear that rotates around the shaft member, A planetary gear that meshes with the aforementioned sun gear, A carrier that rotatably supports the aforementioned planetary gear, It has an output gear member that has a first engagement hole and meshes with the planetary gear, The output shaft is provided with a second engagement hole and a notch extending from the axial end and communicating the inside and outside of the second engagement hole. The output shaft is fitted into the first engagement hole of the output gear member, and the second engagement hole is positioned radially inward of the first engagement hole. By fitting the shaft member into the second engagement hole, the shaft member deforms the output shaft, causing the outer circumference of the output shaft to come into close contact with the inner circumference of the first engagement hole. A method for manufacturing an electric valve, characterized by the following:

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