JP2003148644A - Electric valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stepping motor-driven type electric valve precisely regu lating the positional relation between a stator coil and a rotor. SOLUTION: Hemispherical projection parts 73 and 74 which are stator-side stator positioning shape parts are provided in positions rotationally displaced by 180 deg. around the central axis of a stator member 45, respectively. Dimples 51 which are case-side stator positioning shape parts are provided in positions rotationally displaced by a rotating angle twice the rotor rotating angle corresponding to one cycle of a stator exciting pattern around the central axis of a case 44, respectively.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an electric valve,
In particular, the present invention relates to a mechanical positioning structure of a stator for setting the origin position of a rotor in a stepping motor drive type electric valve.

[0002]

2. Description of the Related Art In a stepping motor drive type electric valve used as a variable throttle valve, a flow control valve or the like, in order to obtain a predetermined valve opening degree by a drive pulse signal given to a motor and perform desired quantitative control. , So that the magnetic pole of the multi-pole permanent magnet provided on the rotor with respect to the magnetic pole teeth of the stator member is located at a predetermined position in the rotor rotation direction based on the valve closed (fully closed) reference or the valve open (fully open) reference, It is necessary to mechanically set the origin position of the rotor, and in connection with this, it is also necessary to set the circumferential mounting position of the stator member to the case to a specific position. In addition to this, it is necessary to mount the stator member by positioning the mounting position of the stator member in the axial direction with respect to the case at an appropriate position.

On the other hand, a positioning mechanism for mounting the stator member at a predetermined mounting position in the circumferential direction with respect to the case has been incorporated into the stator member mounting portion (see, for example, Japanese Patent Application Laid-Open No. 2004-242242). 1, 2, 3).

A position where the stator member can be mounted in the circumferential direction with respect to the origin position of the rotor (phase matching position)
Exists for each rotor rotation angle corresponding to one cycle of the stator excitation pattern. For example, in 1-2 phase excitation, 8
There is a phase matching position for each rotation angle of the pulse, and when the number of magnetic poles is 20, there are 10 phase matching positions for 80 pulses per rotation.

This means that the circumferentially attachable positions of the stator member with respect to the case are 360 ° / 10, and there are 10 at every rotation angle of 36 °.
The lead-out direction of the lead wire of the stator coil can be selected from 10 positions divided by 36 degrees around the entire circumference of the case.

[0006]

[Patent Document 1] JP-A-61-218354

[Patent Document 2] Japanese Patent Laid-Open No. 63-73864

[Patent Document 3] Japanese Patent Laid-Open No. 11-315948

[0007]

In the conventional circumferential positioning mechanism for a stator member, it is necessary to provide a positioning engagement portion on the case for each circumferential mountable position of the stator member on the case. If there are 10
In order to have the entire degree of freedom in the direction of taking out the lead wire of the stator coil, it is necessary to provide ten positioning engaging portions on the case.

In the case where the positioning engagement portion on the case side is a dimple formed by press molding, if the number of dimples is large, the circumferential distance between adjacent dimples becomes narrower, which deteriorates the press moldability and improves the molding accuracy. And the incidence of defective products such as molding cracks increases.

As described above, in the stepping motor drive type solenoid valve, it is necessary to accurately position the stator member in the circumferential direction with respect to the case by determining the positional relationship between the stator coil and the rotor, that is, the origin position of the rotor. Although very important for regulation, the conventional concrete method of achieving it has the above-mentioned problems.

Further, accurate positioning of the stator member with respect to the case is important not only in the circumferential direction of the case described above but also in the axial direction of the case. The reason is that if the position of the stator member with respect to the case deviates in the axial direction of the case, a positional deviation of the case in the axial direction will occur between the rotor and the stator, and the magnetic force generated in the stator will be effective. This is because it does not act on the rotor and may cause a reduction in the torque generated by the stepping motor, or in some cases it may cause a non-operation.

The present invention has been made in order to solve the problem that the positional deviation between the rotor and the stator coil affects the operation accuracy of the stepping motor drive type solenoid valve as described above. It is an object of the present invention to provide a motor-operated valve capable of accurately defining the positional relationship between a stator coil and a rotor in a drive type solenoid valve.

[0012]

In order to achieve the above object, a motor-operated valve according to the present invention has a rotor rotatably housed in a case made of a non-magnetic material, and a stator member arranged outside the case. In the electrically operated valve for driving the valve body to open and close by the rotation of the rotor of the stepping motor, the case has a cup shape with a cylindrical cross section, and the stator member has a central fitting hole with a circular cross section. An inter-engaging shape positioning portion for the stator, which is fitted to the outer periphery and sets the circumferential mounting position of the stator member with respect to the case in relation to the circumferential position of the magnetic pole of the stator member, is provided with the stator member and the stator positioning shape portion. The stator member side stay is divided into a whole number (360 degrees) divided by the rotor rotation angle corresponding to one cycle of the stator excitation pattern. Separately the number and the number of stator positioning shape portion of the case side use positioning shape portion is formed with these positioning shape portion.

In order to achieve the above object, the motor-operated valve according to the present invention has a stepper motor in which a rotor is rotatably housed in a non-magnetic case and a stator member is arranged outside the case. In the electrically operated valve for opening and closing the valve element by rotating the rotor, the case has a cup shape with a cylindrical cross section, and the stator member is fitted to the outer periphery of the case with a central fitting hole having a circular cross section. Then
A stator positioning shape portion having a mutual engagement shape for setting a circumferential mounting position of the stator member with respect to the case in relation to a circumferential position of a magnetic pole of the stator member is formed on the stator member and the case, The stator positioning shapes on the stator member side are respectively provided at positions rotatively displaced from each other by 180 degrees about the central axis of the stator member, and the stator positioning shapes on the case side are stator-excited about the center axis of the case. The rotor positioning angle portions corresponding to one cycle of the pattern are provided at positions rotationally displaced from each other by a rotation angle twice, or conversely, the stator positioning shape portion on the stator member side is provided with Rotor rotation angle of 2 corresponding to one cycle of the stator excitation pattern around the central axis
Double rotation angles are provided at positions that are rotationally displaced from each other,
The stator positioning shape portions on the case side are respectively provided at positions rotatively displaced from each other by 180 degrees around the central axis of the stator member.

According to the motor-operated valve of the present invention, one of the stator positioning shapes located at positions 180 degrees rotationally displaced relative to each other selectively selects one of the stator excitation patterns.
For each rotor rotation angle corresponding to one cycle of the stator excitation pattern by selectively engaging with one of the stator positioning shape portions on the opposite side at each rotation angle twice the rotor rotation angle corresponding to one cycle. Further, the circumferential mounting position of the stator member with respect to the case can be selectively set.

Further, the motor-operated valve according to the present invention has, at one end portion of the stator member, both leg pieces fixed to the stator member and a bridge piece connecting the both leg pieces, and the center fitting is provided. A portal-shaped mount bridge piece extending radially across the joint hole is provided, and the stator positioning shape portion is integrally formed with the mount bridge piece,
The case is inserted into the central fitting hole of the stator member, and the bridge piece portion of the mounting bridge piece comes into contact with the top portion of the case exposed axially outward from the central fitting hole, whereby The axial position of the stator member with respect to the case is set.

According to the motor-operated valve of the present invention, the gate-shaped mounting bridge piece allows the stator member to be axially positioned with respect to the case at the same time as the circumferential mounting position of the stator member is selectively set.

In the electrically operated valve according to the present invention, the mounting bridge piece has a pair of locking hanging pieces at the center of the bridge piece, and the locking hanging piece and the outer peripheral surface of the case. The stator positioning shape portion having an uneven shape is formed, and the mutual separation distance of the pair of the locking hanging pieces in the free state is smaller than the outer diameter of the case, and the elastic deformation of the locking hanging pieces causes Due to the obtained spring property, the locking hanging piece portion is pressed against the outer peripheral surface of the case, and the pressing positioning portion for the stator can be engaged and recessed by the pressing.

Further, in the motor-operated valve according to the present invention, the mount bridge piece has a spring piece portion formed by a C-shaped or U-shaped slit formed in each of the leg piece portions so as to have an opening. The stator positioning shape portion having a concavo-convex shape is formed on the spring piece portion and the outer peripheral surface portion of the case, and the spring piece portion is pressed against the outer peripheral surface of the case by the spring property obtained by elastic deformation of the spring piece portion. It is also possible to adopt a structure in which the stator positioning shape portion engages in a concave-convex shape by the pressing.

The motor-operated valve according to the present invention is further arranged so as to surround the outer periphery of the shaft-shaped portion and a guide support body which is fixed in the case and includes a shaft-shaped portion extending in the axial direction of the rotor. A spiral guide wire body having a coil spring shape having a stopper wire body portion extending in the axial direction at an end portion in the axial direction; and the spiral by engaging with the spiral guide wire body and rotationally driven by the rotor. While being guided by the guide wire and rotating, it moves in the axial direction of the spiral guide wire and hits the stopper wire part of the spiral guide wire to stop further rotation, and the origin of the rotor Having a movable stopper member for mechanically setting the position,
A guide support positioning shape part for setting a circumferential mounting position of the guide support with respect to the case in relation to a circumferential position of the stator member positioning shape part is formed in the guide support and the case, The circumferential engagement position of the guide support with respect to the case is set by mutual engagement of the guide support positioning shapes.

According to the motor-operated valve of the present invention, the origin position of the rotor is mechanically set by the movable stopper member abutting against the stopper wire portion of the spiral guide wire, so that the rotor can be moved in the circumferential direction of the guide support relative to the case. The mounting position is reliably and easily determined without mutual error by the mutual engagement of the positioning shape portion for the guide support, and the relative position in the circumferential direction between the stopper wire body portion or the stopper projection portion and the magnetic pole of the stator member is determined. It is set with high accuracy without including a variation error.

Further, in the motor-operated valve according to the present invention, dimples are press-molded on the case, and the dimples are
The stator outer peripheral surface side forms the stator positioning shape portion, and the case inner peripheral surface side forms the guide support body positioning shape portion. As a result, the relative position between the positioning shape portion for the stator and the positioning shape portion for the guide support is naturally determined uniformly, and a variation error does not occur.

Further, in the motor-operated valve according to the present invention, a hook-shaped mount piece is fixed to one end of the stator member, and the stator positioning shape portion is integrally formed with the mount bridge piece. The case is inserted into the central fitting hole, and the mount piece abuts on the top of the case exposed axially outward from the central fitting hole, whereby the axial position of the stator member with respect to the case is set. To be done.

Also by the motor-operated valve according to the present invention, the hook-shaped mount piece allows the stator member to be axially positioned with respect to the case at the same time as the mounting position of the stator member with respect to the case is selected and set.

Further, in the motor-operated valve according to the present invention, the rotor is rotatably housed in the case made of a non-magnetic material, and the valve body is rotated by the rotation of the rotor of the stepping motor in which the stator member is arranged outside the case. In an electrically operated valve that is driven to open and close, the case has a cup shape with a cylindrical cross section, and the stator member is fitted to the outer periphery of the case through a central fitting hole having a circular cross section, and is attached to one end of the stator member. A gate-shaped mounting bridge piece that has both leg pieces fixed to the stator member and a bridge piece that connects the both leg pieces and that extends radially across the central fitting hole. The bridge piece portion of the mounting bridge piece is provided on the top portion of the case that is provided and has the case inserted into the central fitting hole of the stator member and is exposed outward in the axial direction from the central fitting hole. By, set the axial position with respect to the casing of the stator member.

According to the motor-operated valve of the present invention, positioning of the stator member in the axial direction with respect to the case is performed by the gate-shaped mounting bridge piece.

In the motor-operated valve according to the present invention, the gate-shaped mounting bridge piece has the locking piece portions at the ends of the two leg pieces, and the locking groove portion having the transverse L-shaped cross section is formed on one end surface of the stator member. The mounting bridge pieces are formed in pairs, and the locking piece portions at both ends of the mounting bridge piece are engaged with the locking groove portions by the springiness of the mounting bridge piece itself, so that the mounting bridge piece is fixed to the stator. The structure for fixing to the member can be a simple fixing structure.

Further, in the electrically operated valve according to the present invention, the rotor is rotatably housed in the case made of a non-magnetic material, and the valve body is rotated by the rotation of the rotor of the stepping motor in which the stator member is arranged outside the case. In an electrically operated valve that is driven to open and close, the case has a cup shape with a cylindrical cross section, and the stator member is fitted to the outer periphery of the case through a central fitting hole having a circular cross section, and is attached to one end of the stator member. A hook-shaped mount piece is fixed, the case is inserted into the central fitting hole of the stator member, and the mount piece contacts the top of the case exposed axially outward from the central fitting hole. Thus, the axial position of the stator member with respect to the case is set.

According to the motor-operated valve of the present invention, the hook-shaped mount piece positions the stator member in the axial direction with respect to the case.

Further, in the motor-operated valve according to the present invention, the hook-shaped mount piece has a flat plate-shaped mounting substrate portion, and the hook-shaped piece portion is erected from the mounting substrate portion, and one end surface of the stator member is formed. The slide guides of the laterally L-shaped cross section formed on the side are slidably inserted and mounted, and the stoppers are brought into contact with each other to lock in the inserting direction. The structure for fixing to can be a simple fixing structure.

[0030]

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. 1 to 7 show one embodiment of the motor-operated valve according to the present invention.

As shown in FIG. 1, the motor-operated valve has a valve housing (body) 10. Valve housing 10
Is a press-formed product manufactured by pressing a stainless steel plate, and defines a valve chamber 11 inside. The valve housing 10 has a first copper-made first chamber that directly communicates with the valve chamber 11.
Pipe joint 12, a valve seat member 14 that defines the valve port 13 and is made of stainless steel or sintered metal, and a copper second pipe joint 15 that communicates with the valve chamber 11 through the valve port 13, respectively. It is fixedly mounted by welding, brazing, etc.

In this embodiment, the first pipe joint 12
Will be the primary side and the second pipe joint 15 will be described as an example where the refrigerant flows so as to be the secondary side. In the motor-operated valve of this embodiment, the second pipe joint 15 is the primary side. It is a two-way type that can be used even when the refrigerant flows so that the first pipe joint 12 becomes the secondary side.

A valve body 16 is provided in the valve chamber 11.
The valve body 16 has a needle valve portion 17 that quantitatively increases and decreases the opening and closing of the valve port 13 and the effective opening area by moving in the axial direction (vertical direction) with respect to the valve seat member 14, and the base portion of the valve holder 18 has a cylindrical shape. It is fixed to one end (lower end) by welding or the like.

A valve guide member 19 made of a press-formed stainless steel plate is fixed in the valve chamber 11. A cylindrical guide portion 20 having an inner diameter substantially the same as the outer diameter of the valve holder 18 is integrally molded in the center of the valve guide member 19, and the valve holder 18 slides on the cylindrical guide portion 20 in the axial direction. Fitting is possible.

An end plate 21 is provided at the other end (upper end) of the valve holder 18, and a through hole 22 is formed at the center of the end plate 21. The through hole 22 has a stepping motor 40.
One end portion (lower end portion) 41 </ b> A of the rotor shaft 41 of FIG. The tip portion (lower end portion) 41A is located in the valve holder 18, and the tip portion (lower end portion) 41A is located.
A stopper 24 made of a sleeve with a flange is fixed to the. A flat washer 26 made of a highly slippery resin such as fluororesin is sandwiched between the end plate portion 21 of the valve holder 18 and the flange portion 25 of the stopper 24.

With this structure, the rotor shaft 41 can lift the valve holder 18 (movement in the valve opening direction) in a mode in which it can rotate with respect to the valve holder 18 with low friction resistance.

The lower end of the valve holder 18 is closed by the valve body 16, and a spring receiving member made of resin that abuts the back surface of the valve body 16 with a hemispherical abutment portion 27 on the valve body 16 side in the valve holder 18. 28 is provided. A compression coil spring 29 is mounted between the spring receiving member 28 in the valve holder 18 and the flange portion 25 of the stopper 24 in a state where a predetermined preload is applied.

With this structure, the rotor shaft 41 and the stopper 2
4, the compression coil spring 29, and the spring receiving member 28 are
6 and the valve holder 18 can be rotated with low friction resistance.

A female screw holder 30 made of a press-formed stainless steel plate is fixed to the valve housing 10.
A female screw member 31 is fixed to the female screw holder 30. The female screw member 31 is a PP filled with a highly lubricating filler such as a sintered metal containing a solid lubricant or a fluororesin.
It is made of a synthetic resin such as S resin, and has a female screw hole 32 formed at its center.

A male screw portion 33 is formed integrally with the rotor shaft 41. The male screw portion 33 penetrates the female screw hole 32 in a threaded engagement state, and the rotor shaft 41 rotates about its own central axis, thereby rotating by the screw engagement between the male screw portion 33 and the female screw hole 32 while rotating the axis line. Move in the direction.

The rotor shaft 41 is fixedly connected to the rotor 43 by a serration shaft portion 42. The rotor 43 is
It is a permanent magnet of N-pole and S-pole alternating multi-pole magnetized, which is composed of a ferrite sintered product, a rare earth sintered magnet, or a plastic magnet.

A cup-shaped case (can) 44 having a cylindrical cross section made of a press-formed stainless steel plate is hermetically fixed to the upper end surface portion 34 of the valve housing 10.
The case 44 is hermetically fixed by abutting the annular opening edge portion 44C of the case 44 against the flat upper end surface portion 34 of the valve housing 10 and butt welding the entire circumference by TIG welding or laser welding. There is. This butt weld is designated by the numeral 35 in FIG.

By such butt welding, the case 4
The internal pressure of 4 does not act in the direction of separating the welding surface portion between the valve housing 10 and the case 44, and the valve housing 1
The compressive strength of the joint between 0 and the case 44 is improved.

The case 44 accommodates the rotor 43 of the stepping motor 40 rotatably in a concentric state on the inner side, and an annular stator member 45 on the outer side.

The stator member 45 has a central fitting hole 45A having a circular cross section and has an annular shape, and is fitted to the outer periphery of the case 44 through the central fitting hole 45A. Stator member 45
Has upper and lower two stages of stator coils (windings) 46, which is entirely liquid-tightly molded with an electrically insulating resin 47, and has a plurality of magnetic pole teeth (not shown) at equal intervals on the entire inner peripheral portion. ing. An electric connection connector 48 for taking out a lead wire of the stator coil 46 is provided at a part of the outer peripheral surface of the stator member 45.
(The inside is not shown).

A gate-shaped mounting bridge piece 70 is provided on the upper end surface of the stator member 45. The mounting bridge piece 70 is a press-formed product that forms a gate shape by a pair of leg piece portions 70B each having a locking piece portion 70A bent at the tip and a bridge piece portion 70C that connects both leg piece portions 70B. The bridge piece portion 70C extends radially across the central fitting hole 45A.

On the upper end surface of the stator member 45, locking groove portions 49 (see FIG. 5) having an L-shaped transverse cross-section are formed in pairs so as to rise, and the locking piece portion of the mounting bridge piece 70 is formed. 70A is fitted into and engaged with the locking groove portion 49 by the spring property of the mounting bridge piece 70 itself, so that the mounting bridge piece 70 is positioned at a predetermined position related to the circumferential position of the magnetic pole teeth of the stator member 45. It is fixed (locked).

The tip of the locking piece 70A is, in plan view,
It has a U-shape (concave shape) (see FIG. 6 (a)), and by engaging this portion so as to sandwich both sides of the locking groove portion 49, the mounting bridge piece 70 can be seen in FIG. 4. The horizontal mounting position is determined.

As shown, the case 44 is inserted into the central fitting hole 45A of the stator member 45, and the case 4
The top portion 44A of No. 4 is exposed to the outside in the axial direction from the central fitting hole 45A, and the bridge portion 70C of the mounting bridge piece 70 comes into contact with the top portion 44A to prevent the stator member 45 from falling off. A mounting position in the axial direction with respect to the case 44 is set.

As a result, the case 44 and the valve housing 1
Even if the outer diameters of 0 are the same and there is no step in the connecting portion between the case 44 and the valve housing 10, the mounting position of the stator member 45 in the axial direction with respect to the case 44 is determined to be an appropriate position, and the stator member 45 may slip off. Absent.

At the central portion of the bridge piece 70C of the mounting bridge piece 70, locking hanging pieces 71 and 72 are paired at positions displaced by 180 degrees from each other about the central axis of the stator member 45. It is bent and formed. Hemispherical protrusions 73 and 74 are press-molded near the tips of the locking hanging pieces 71 and 72, respectively, as positioning portions for the stator.

A plurality of dimples 51 are press-molded on the outer peripheral surface portion 44D of the case 44. Dimple 51
Is a positioning portion for the stator in which the hemispherical projections 73 or 74 of the mounting bridge piece 70 are fitted (concave and convex engagement) in the concave portion 51A on the outer peripheral surface side of the case, and the convex portion 51B on the inner peripheral surface side of the case is formed. A positioning shape portion for a guide support, which will be described later, is formed.

As shown in FIG. 4, the dimples 51 are located around the center axis of the case 44 and are rotationally displaced from each other by a rotation angle θ that is twice the rotor rotation angle corresponding to one cycle of the stator excitation pattern. Are provided in each.

When the excitation of the stator member 45 is 1-2 phase excitation, the rotor rotation angle corresponding to one cycle of the stator excitation pattern corresponds to the rotation angle of 8 pulses, and the number of magnetic poles of the stator member 45 is 20. If there are 80 pulses per rotation, 80/8 pulses, there are 10 alignment positions,
The rotor rotation angle corresponding to one cycle of the stator excitation pattern is 360 degrees / 10, which is 36 degrees, the rotation angle θ is 72 degrees, and five dimples 51 are provided at equal intervals around the central axis of the case 44.

By fitting the hemispherical projections 73 or 74 into the recesses 51A of one dimple 51 selected from the five dimples 51, the circumferential mounting position of the stator member 45 with respect to the case 44 is set. .

The distance L between the hemispherical protrusions 73 and 74 in the free state of the pair of locking hanging pieces 71 and 72.
(See FIG. 6) is smaller than the outer diameter D of the case 4 (see FIG. 2), and the hanging parts 71, 72 for locking are spread and engaged with the outer peripheral surface part 44D of the case 44 to lock. The hemispherical projections 73 and 74 are pressed against the outer peripheral surface of the case 44 by the spring property obtained by the elastic deformation of the hanging pieces 71 and 72.

By this pressing, the hemispherical projections 73 or 74 of the mounting bridge piece 70 are fixed to the case 4
The dimples 51 of No. 4 are firmly engaged with each other without rattling.

A guide support 52 is fixed in the case 44. As shown in FIGS. 7 to 9, the guide support body 52 has a cylindrical portion (axial portion) 53 and an umbrella-shaped portion 54 formed on the upper end side of the cylindrical portion 53, and the entire It is integrally formed by pressing. Umbrella 54 is case 4
4 is formed in the same shape as the top inner side 44B of the No. 4, and the notch engaging portion is formed on the umbrella-like portion 54 so as to engage with each convex portion 51B of each of the five dimples 51 as the guide support positioning shape portion. 55 is press molded.

In the guide support body 52, the umbrella-shaped portion 54 is alignedly engaged with the top inner side 44B of the case 44, and the notch engaging portion 55 is provided.
By engaging the convex portion 51B of the dimple 51,
It is fixed in the case 44 in a state where the mounting position in the circumferential direction with respect to the case 44 is set.

The cylindrical portion 53 is concentric with the rotor 43 and extends axially downward from the center of the top of the case 44. A key-shaped valve-opening stopper projection 56 is axially press-formed over a predetermined length at a predetermined circumferential position of the base portion (connection portion with the umbrella-shaped portion 54) of the cylindrical portion 53. Further, a positioning hole 57 is press-molded by a louver molding die at a position having a predetermined circumferential positional relationship with the notch engaging portion 55, at the tip portion (lower end portion) of the cylindrical portion 53. At the inner part of the positioning hole 57, there is a cut-and-raised piece (uncut piece) 58 formed by louver molding (see FIG. 1).

The cylindrical portion 53 is provided with a spiral guide wire body 60 formed of a wire material having a spring property in a coil spring shape so as to surround the outer circumference of the cylindrical portion 53. The spiral guide wire body 60 includes a stopper wire body portion (valve closing stopper portion) 61 extending in the axial direction at the lower end portion, and an engagement end formed by bending the tip end of the stopper wire body portion 61 inward in the radial direction. And 62 together.

The spiral guide wire body 60 abuts the end surface 56A of the valve-opening stopper projection 56 at the upper end side, the engaging end 62 is inserted and fitted in the positioning hole 57, and the tip of the engaging end 62 is the spiral guide wire. It is abutted against the cut-and-raised piece 58 by the elastic force of the body 60 in the radial direction. As a result, the spiral guide wire body 60 is sandwiched between the end surface 56A of the valve opening stopper protrusion 56 and the positioning hole 57 by the axial spring load, and the axial mounting position is determined without rattling. Has been.

The engaging end 62 of the spiral guide wire body 60 is inserted and fitted into the positioning hole 57, and the tip of the engaging end 62 is cut and raised by the radial elastic force of the spiral guide wire body 58.
The position of the stopper wire body portion 61 in the radial direction is determined, and the stopper wire body portion 61 is positioned and locked by the cylindrical portion 53 at a position determined by the arrangement position of the positioning hole 57.

A movable stopper member 63 is rotatably engaged with the spiral guide wire body 60. Movable stopper member 63
Has a one-turn coil spring shape and has a stopper wire body portion 64 extending outward in the radial direction at one end. The rotor 43 has a pin-shaped protrusion 43 for kicking around the movable stopper member 63 at a predetermined circumferential position based on the magnetic pole position of the permanent magnet.
A is integrally molded.

The movable stopper member 63 abuts the pin-shaped projection portion 43A of the rotor 43 at the stopper wire body portion 64, and is kicked around by the rotation of the rotor 43 to guide the spiral guide wire body 60 while rotating. The spiral guide wire body 60 moves in the axial direction of the spiral guide wire body 60 by the spiral movement, and the stopper wire body portion 64 abuts on the stopper wire body portion 61 of the spiral guide wire body 60, whereby further left rotation is stopped, The origin position of the rotor 43 is mechanically set based on the valve closing standard. Further, the stopper wire body portion 64 abuts on the valve-opening stopper protrusion portion 56, so that further clockwise rotation is stopped, and the valve open (fully open) position is mechanically determined.

The cylindrical portion 53 also serves as a rotor bearing guide, and a bearing member 65 is fitted in the cylindrical portion 53 so as to be movable in the axial direction. The bearing member 65 is made of a material containing a lubricant, such as metal or synthetic resin, or a surface-treated component, and receives the hemispherical tip portion 41C of the extension shaft portion 41B above the rotor shaft 41. Also,
A compression coil spring 66 is provided in the cylindrical portion 53 between the top of the case 44 and the back of the bearing member 65 in a state where a predetermined preload is applied.

In the motor-operated valve having the above-described structure, when the drive pulse signal is applied to the stator member 45, the rotor 43 rotates in accordance with the number of pulses, and the rotor shaft 4 accordingly.
The male screw portion 33 coaxial with 1 rotates, the rotor shaft 41 moves in the axial direction by the screw engagement relationship with the fixedly arranged female screw member 31, and the valve body 16 opens and closes.

The movable stopper member 63 is kicked around by the rotation of the rotor 43, and as described above, the stopper wire body portion 64 of the movable stopper member 63 abuts on the stopper wire body portion 61 of the spiral guide wire body 60. Further counterclockwise rotation is stopped, and the origin position of the rotor 43 is mechanically set based on the valve closing standard.

One of the hemispherical projections 73 or 74 engages with the recess 51A of one dimple 51 selected from the five dimples 51, so that one cycle of the stator excitation pattern is obtained. The circumferential mounting position of the stator member 45 with respect to the case 44 can be selectively set for each rotor rotation angle. In this case, ten mounting positions at intervals of 36 degrees can be selected with respect to the five dimples 51, and the direction of taking out the lead wire of the stator coil (the position in the circumferential direction of the electrical connection connector 48) can be set around the entire circumference of the case 44. It is possible to select from 10 locations divided into 36 degrees.

Further, the stator member 4 with respect to the case 44 is
5 and the mounting position of the guide support 52 with respect to the case 44 in the circumferential direction are the hemispherical projections 73 or 74 and the selected dimple 51, respectively.
By the mutual engagement with the concave portion 51A and the mutual engagement between the notch engaging portion 55 and the convex portion 51B of the dimple 51, the determination is made surely and easily without any variation error. The relative position of the member 45 with respect to the magnetic pole teeth in the circumferential direction is set with high accuracy without including a variation error.

Further, as described above, the dimple 51 forms the positioning shape portion for the stator member on the outer peripheral surface side of the case and the positioning shape portion for the guide support on the inner peripheral surface side of the case. The relative position between the positioning shape portion for the stator member and the positioning shape portion for the guide support is naturally determined uniformly, and a variation error does not occur. Due to these, the origin position of the rotor 43 varies. The flow rate can be set with high accuracy without including components, and highly accurate quantitative flow rate control can be performed.

In the above-described embodiment, the hemispherical projections 73 and 74, which are the positioning shape portions on the stator member side, are provided at the positions that are rotationally displaced from each other by 180 degrees, and the dimples 51 that are the positioning shape portion on the case side are 72 degrees. Five pieces are provided at intervals, but this combination can be reversed.

That is, as shown in FIG.
Hemispherical protrusion 7 which is a positioning shape portion on the stator member side
5 are provided at respective positions (5 in total) that are rotationally displaced with respect to each other by a rotation angle that is twice the rotor rotation angle (72 degrees) corresponding to one cycle of the stator excitation pattern (a total of 5), and a dimple 51 that is a positioning shape portion on the case side is provided. It is also possible to provide each at a position that is rotationally displaced by 180 degrees (two in total).

As described above, the number of magnetic poles of the stator member is 2
If 0 and 1-2 phase excitation, then the whole circumference (360 degrees)
Divided by the rotor rotation angle of 36 degrees, which corresponds to one cycle of the stator excitation pattern, is 10. The integer divisor is (5, 2), which is the hemispherical protrusion that is the positioning shape portion on the stator member side. When the number is 2, the number of dimples that are the positioning shape portion on the case side is 5, and when the number of the hemispherical protrusions that are the positioning shape portion on the stator member side is 5, the positioning shape portion on the case side is The number of certain dimples is 2, and there are two combinations.

The motor-operated valve according to the present invention can be applied to a two-phase excitation type stator excitation method, and the number of magnetic poles of the stator member is not limited to 20. For example, when the number of magnetic poles of the stator member is 24 and 1-2 phase excitation is performed, there are 12 phase alignment positions with 96 pulses per rotation and 96/8 pulses.

In this case, the rotor rotation angle corresponding to one cycle of the stator excitation pattern is 360 degrees / 12 and is 30 degrees.
The number obtained by dividing the entire circumference (360 degrees) by the rotor rotation angle of 30 degrees corresponding to one cycle of the stator excitation pattern is 1.
2, the integer divisor is (6, 4, 3, 2), and if the number of hemispherical protrusions that are the positioning member on the stator member side is 2, the dimples that are the positioning member on the case side are formed. Is 6, and when the number of hemispherical protrusions that are the positioning shape portions on the stator member side is 2, the number of dimples that are the positioning shape portions on the case side is 6.
If the number of hemispherical protrusions, which are the positioning shape portions on the stator member side, is 3, the number of dimples, which are the positioning shape portions on the case side, is 4, and the number of hemispherical projection portions that are the positioning shape portions on the stator member side is 4. When the number is 4, the number of dimples that are the positioning shape portion on the case side is 3, and when the number of the hemispherical protrusions that are the positioning shape portion on the stator member side is 6, the positioning shape portion on the case side is The number of certain dimples is 2, and there are 4 combinations.

11 to 13 show another embodiment of the mounting bridge piece 70, respectively. 11 to 11.
13, parts corresponding to those in FIG. 6 are designated by the same reference numerals as those in FIG. 6, and description thereof will be omitted.

In the embodiment shown in FIG. 11, hemispherical projections 73 and 74 are provided so as to face both leg pieces 70B of the mounting bridge piece 70. In this embodiment, the hemispherical projections 73 or 74 of the leg pieces 70B engage with the dimples 51 on the case 44 side due to the spring property of the entire gate-shaped mounting bridge piece 70.

In the embodiment shown in FIGS. 12 and 13, a C-shaped or U-shaped slit 70D is formed in both leg pieces 70B of the mounting bridge 70, and slits 70D are formed in both leg pieces 70B. An enclosed spring piece portion 70E is formed. Hemispherical projections 73 and 74 are formed on each of the spring piece portions 70E. In this embodiment,
The spring property obtained by the elastic deformation of the spring piece portion 70E presses the spring piece portion 70E against the outer peripheral surface of the case 44, and the hemispherical projection portion 73 or 74 of the spring piece portion 70E is pressed by this pressing to the dimple 51 on the case 44 side. Engage with.

Also in these embodiments, as in the above-described embodiments, the bridge piece portion 70C of the mounting bridge piece 70 abuts on the top portion 44A of the case 44, so that the case 44 of the stator member 45 also serves as a fall prevention. The axial mounting position with respect to is set, and the hemispherical projection 73
Alternatively, by fitting 74 into the recess 51A of the dimple 51, the mounting position of the stator member 45 with respect to the case 44 in the circumferential direction is set.

14 and 15 show another embodiment of the motor-operated valve according to the present invention. 14 and 15, parts corresponding to those in FIGS. 1 to 4 are denoted by the same reference numerals as those in FIGS. 1 to 4, and description thereof will be omitted.

In this embodiment, a hook-shaped mount piece 80 is provided on the upper end surface of the stator member 45. The mount piece 80 is a press-molded product, and as shown in FIG. 16, a rising piece portion 80B bent from a C-shaped plate-like mounting substrate portion 80A and a tip end of the rising piece portion 80B are formed in a radial direction. It has a hook-shaped piece portion 80D having a spring property due to the inwardly extending radial piece portion 80C, and a hemispherical projection 81 is formed on the upright piece portion 80B.

One engaging recess 8 is formed in the mounting substrate 80A.
0E, a pair of cut-and-raised stopper pieces 80F formed on the outer edges of both leg portions, and a pair of pressing piece portions 80G formed upright on the inner edges of both leg portions. On the upper end surface of the stator member 45, a pair of overturned L-shaped cross-sectional slide guide portions 82 are formed upright, and the mount piece 80 is formed along the upper end surface of the stator member 45 in the direction of arrow S in FIG. Is slid between the pair of slide guide portions 82 in a sliding manner.

When the cut-and-raised stopper pieces 80F on both sides pass through the slide guide portions 82 in a non-reflective manner and are inserted to positions beyond the end portions 82A of the slide guide portions 82, the engagement at the insertion tip side is performed. The recessed portion 80E abuts and engages with the laterally-rolled L-shaped cross-sectional shape portion 83 formed upright on the upper end surface of the stator member 45.

As a result, the mount piece 80, with respect to the stator member 45, has a pair of slide guide portions 82 and a lateral roll L.
A pair of cut-and-raised stopper pieces 8 are locked in the axial direction (vertical direction) by the engagement of three portions of the shape cross-section shape portion 83.
0F hits the end portion 82A of the slide guide portion 82 respectively, and the engaging recessed portion 80E abuts the laterally-rolled L-shaped cross-sectional shape portion 83, whereby locking in the radial direction (left-right direction) is performed.
It should be noted that some rattling in the left-right direction caused by the tolerance of these locking portions is allowed.

After mounting the mount piece, the stator member 4
The case 44 is inserted from the lower side into the central fitting hole 45A of No. 5. The case 44 is inserted until the top portion 44A of the case 44 comes into contact with the radial direction piece portion 80C of the mount piece 80. As a result, the mounting position of the stator member 45 in the axial direction with respect to the case 44 is also set in order to prevent falling off. When this insertion is completed, the pair of pressing pieces 80G of the mount pieces 80 abut on the outer peripheral surface portion 44D of the case 44, respectively.

In this state, the pressing piece portion 80G and the upright piece portion 80B sandwich the case 44 from both sides in the radial direction with the elastic deformation of the hook-shaped piece portion 80D, and are obtained by the elastic deformation of the hook-shaped piece portion 80D. The rising piece portion 80 </ b> B is pressed against the outer peripheral surface of the case 44 due to the springiness. Further, the reaction force pushes the engagement concave portion 80E against the laterally-rolled L-shaped cross-sectional shape portion 83, and the rattling in the left-right direction disappears.

By this pressing, the hemispherical projections 81 of the upright piece 80B are firmly engaged with the dimples 51 of the case 44 without rattling.
As a result, the mounting position of the stator member 45 in the circumferential direction with respect to the case 44 is set, and accordingly, the origin position of the rotor 43 is set with high accuracy without including a variation component, as in the above-described embodiment.

17 and 18 show another embodiment of the hook-shaped mount piece 80. 17 and 18, parts corresponding to those in FIGS. 14 to 16 are shown in FIGS.
The same reference numerals as those given to No. 6 are given and the description thereof is omitted.

In this embodiment, the pressing piece portion 80G is omitted, and a pair of hook-shaped locking claw shaped portions 80J are provided on the outer edge sides of both leg portions of the mounting substrate portion 80A.

Also in this embodiment, the mount piece 80 is slidably inserted between the pair of slide guide portions 82 by sliding along the upper end surface of the case 44 in the direction of arrow S in FIG.

When the cut-and-raised stopper pieces 80F on both sides pass through the slide guide portion 82 in a non-reflective manner and are inserted to a position beyond one end portion 82A of the slide guide portion 82, a pair of locking pieces are engaged. The claw-shaped portion 80J abuts on the other end portion 82B of the slide guide portion 82, and the engagement concave portion 80E on the insertion tip side is formed on the upper end surface of the stator member 45 so as to rise up. Engage with section 83.

As a result, the mount piece 80, with respect to the stator member 45, has a pair of slide guide portions 82 and a lateral roll L.
A pair of cut-and-raised stopper pieces 8 are locked in the axial direction (vertical direction) by the engagement of three portions of the shape cross-section shape portion 83.
0F hits the end portion 82A of the slide guide portion 82, and the pair of locking claw-shaped portions 80J hit the end portions 82B of the slide guide portion 82, respectively, so that the locking is performed in the radial direction (left-right direction). Also in this case, some rattling in the left-right direction (insertion direction) caused by the tolerance of the locking portions is allowed.

After assembling the mount pieces, the stator member 4
The case 44 is inserted from the lower side into the central fitting hole 45A of No. 5. The case 44 is inserted until the top portion 44A of the case 44 comes into contact with the radial direction piece portion 80C of the mount piece 80. As a result, the mounting position of the stator member 45 in the axial direction with respect to the case 44 is also set in order to prevent falling off.

In this state, the hook-shaped piece 80D is elastically deformed, and the rising piece 80B is pressed against the outer peripheral surface of the case 44 by the spring property obtained by the elastic deformation of the hook-shaped piece 80D. Moreover, the locking claw shaped portion 80J is pressed against the end portion 82B of the slide guide portion 82 by the reaction force, and rattling in the left-right direction disappears.

As a result, the hemispherical projection 81 of the upright piece 80B firmly engages with the dimple 51 of the case 44 in a concavo-convex manner without rattling, and the stator member 45 extends in the circumferential direction with respect to the case 44. The mounting position is set, and accordingly, as in the above-described embodiment, the rotor 43 is attached.
The origin position of is accurately set without including the variation component.

FIG. 19 shows another embodiment of the hook-shaped mount piece 80. In this embodiment, the mounting substrate portion 80A of the mount piece 80 has an annular shape, and the engaging recess 80
Another engaging recess 80H is formed on the opposite side of E. The engaging recess 80H is another stopper protrusion 84 (FIGS. 14 and 15) formed on the upper end surface of the stator member 45.
A) and engage.

This mount piece 80 has a stopper projection 8
14 along the upper end surface of the stator member 45 by sliding in the direction of the arrow S in FIG. 14 so as to be slidably inserted between the pair of slide guide portions 82 and shown in FIGS. Mounted on the stator member 45 in the same manner as the above.

Therefore, also in this embodiment, as in the above-described embodiment, the radial direction portion 80C of the mount piece 80 abuts on the top portion 44A of the case 44 to prevent the stator member 45 from falling off. The mounting position in the axial direction with respect to is set, and the hemispherical projection 81 is fitted into the dimple 51.
The mounting position in the circumferential direction with respect to the case 44 is set.

FIG. 20 shows another embodiment of the mount piece 90. The mount piece 90 is a press-molded product, and has an annular mounting substrate portion 90A and a mounting substrate portion 90A.
It has a pair of locking pieces 90B and 90C that stand upright and face each other. The mounting board portion 90A is provided with engagement recesses 90D and 90E which engage with the groove portion 83 and the stopper projection portion 84 of the upper end surface of the stator member 45 shown in FIGS. The locking pieces 90B and 90C each have a spring property, and the hemispherical projections 9 are provided on the locking pieces 90B and 90C, respectively.
1, 92 are formed.

Similar to the mount piece 80 shown in FIG. 16, the mount piece 90 is positioned and fixed to the upper end surface of the stator member 45, and the hemispherical projections 91 or 92 have the dimples 51 (see FIGS. 14 and 15). By mounting the stator member 45 to the case 44, the mounting position of the stator member 45 in the circumferential direction is set.

[0102]

As can be understood from the above description, according to the motor-operated valve of the present invention, the stepping motor drive type solenoid valve can accurately define the positional relationship between the stator coil and the rotor in the stepping motor drive type solenoid valve. It is possible to maintain high operation accuracy in the solenoid valve.

Particularly, according to the motor-operated valve of the present invention described in claims 1 to 9, the whole circumference (360 degrees) is divided by the rotor rotation angle corresponding to one cycle of the stator excitation pattern. In addition, since the positioning shape portions are formed by dividing the number of the stator positioning shape portions on the stator member side and the number of the case side stator positioning shape portions, the degree of freedom in the direction of taking out the lead wire of the stator coil is increased. In the case of full circumference, it is possible to reduce the number of positioning engagement parts for phase matching of the stator members compared to the conventional one, and it is excellent in parts manufacturability. Also, it is possible to perform highly accurate phase matching and set the rotor origin position easily. Can be done.

Further, claims 4 to 7 and claims 10 to 1
According to the motor-operated valve of the present invention described in 2, the gate-shaped mounting bridge piece and the hook-shaped mounting piece facilitate the positioning of the axial mounting position in addition to the circumferential positioning of the stator member with respect to the case. It can be carried out.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing one embodiment of a motor-operated valve according to the present invention.

FIG. 2 is a front view showing one embodiment of the motor-operated valve according to the present invention.

FIG. 3 is a side view showing one embodiment of the motor-operated valve according to the present invention.

FIG. 4 is a plan view showing one embodiment of a motor-operated valve according to the present invention.

5 is a partial enlarged cross-sectional view taken along the line AA of FIG.

6A to 6C are three-side views (plan view, front view, side view) of a mounting bridge piece according to one embodiment.

FIG. 7 is a sectional view of a stopper mechanism portion incorporated in the motor-operated valve according to the present invention.

FIG. 8 is a part view (front view) of a guide support body of the electric valve according to the present invention.

FIG. 9 is a part view (bottom view) of a guide support body of the electric valve according to the present invention.

FIG. 10 is an explanatory view of a main part showing another embodiment of the motor-operated valve according to the present invention.

11 (a) to (c) are three-sided views (bottom view, front view, side view) of a mounting bridge piece of another embodiment.

FIG. 12A to FIG. 12C are three-sided views (plan view, front view, side view) of a mounting bridge piece of another embodiment.

13A to 13C are three-sided views (a plan view, a front view, and a side view) of a mounting bridge piece of another embodiment.

FIG. 14 is a plan view showing another embodiment of the motor-operated valve according to the present invention.

FIG. 15 is a front view showing another embodiment of the motor-operated valve according to the present invention.

16A to 16C are three-sided views (a plan view, a front view, and a side view) of a mount piece according to another embodiment.

FIG. 17 is a plan view showing another embodiment of the motor-operated valve according to the present invention.

FIG. 18 is a trihedral view (plan view, front view, side view) of a mount piece according to another embodiment.

19A to 19C are three-sided views (a plan view, a front view, and a side view) of a mount piece according to another embodiment.

20A and 20B are a plan view and a front view of a mount piece of another embodiment.

[Explanation of symbols]

10 valve housing 14 valve seat member 16 valve body 18 valve holder 19 Valve guide member 31 Female thread member 33 Male thread 40 stepping motor 41 rotor shaft 43 rotor 44 cases 45 Stator member 51 dimples 52 guide support 53 Cylindrical part 57 Positioning hole 60 spiral guide wire 61 Stopper wire body 63 Movable stopper member 65 Bearing member 70 Mount bridge piece 73, 74, 75 Hemispherical protrusions 80 mounting pieces 81 Hemispherical protrusion 90 mount pieces 91, 92 hemispherical protrusions

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Takashi Hayashi             535 Sasai, Sayama City, Saitama Prefecture Sagimiya Co., Ltd.             Tokoroyama Office (72) Inventor Yasuo Komiya             535 Sasai, Sayama City, Saitama Prefecture Sagimiya Co., Ltd.             Tokoroyama Office F term (reference) 3H062 AA02 BB10 CC02 DD01 GG02

Claims (13)

[Claims] 1. A motor-operated valve in which a rotor is rotatably accommodated in a case made of a non-magnetic material, and a stepping motor having a stator member disposed outside the case drives the valve element to open and close by rotation of the rotor. The case has a cup shape with a cylindrical cross section, the stator member is fitted to the outer periphery of the case through a central fitting hole having a circular cross section, and the stator member is associated with a circumferential position of a magnetic pole of the stator member. An inter-engagement-shaped stator positioning shape portion that sets the circumferential mounting position of the stator member to the case is formed on the stator member and the case, and the entire circumference (360 degrees) is set to one cycle of the stator excitation pattern. The number of stator positioning shapes on the stator member side and the number of stator positioning shapes on the case side divided by the integer of the number divided by the corresponding rotor rotation angle. The motorized valve is characterized in that these positioning shapes are formed separately. 2. A motor-operated valve which rotatably accommodates a rotor in a non-magnetic case, and which opens and closes a valve body by rotation of the rotor of a stepping motor in which a stator member is arranged outside the case, The case has a cup shape with a cylindrical cross section, the stator member is fitted to the outer periphery of the case through a central fitting hole having a circular cross section, and the stator member is associated with a circumferential position of a magnetic pole of the stator member. An inter-engagement-shaped stator positioning shape portion that sets a circumferential mounting position of the stator member with respect to the case is formed on the stator member and the case, and the stator positioning shape portion on the stator member side is the stator member. Are provided at positions that are rotationally displaced from each other by 180 degrees about the central axis of the Electrically operated valve, characterized by being each provided at twice the rotational angles and rotational displacement position of the rotor rotation angle corresponding to one cycle of the stator excitation pattern around. 3. A motor-operated valve in which a rotor is rotatably housed in a case made of a non-magnetic material, and a stepping motor having a stator member arranged outside the case drives the valve body to open and close by rotation of the rotor. The case has a cup shape with a cylindrical cross section, the stator member is fitted to the outer periphery of the case through a central fitting hole having a circular cross section, and the stator member is associated with a circumferential position of a magnetic pole of the stator member. An inter-engaging shape stator positioning shape portion that sets a circumferential mounting position of the stator member with respect to the case is formed on the stator member and the case, and the stator positioning shape portion on the stator member side is formed of the case. They are provided around the central axis at positions that are rotationally displaced from each other by a rotation angle that is twice the rotor rotation angle that corresponds to one cycle of the stator excitation pattern. The stator positioning shape portion of the scan-side electric valve, characterized that it respectively provided at a position 180 degrees rotated mutually displaced about the central axis of the stator member. 4. The one end of the stator member has both leg pieces fixed to the stator member and a bridge piece connecting the both leg pieces and straddles the central fitting hole in the radial direction. An extending gate-shaped mounting bridge piece is provided, the stator positioning shape portion is integrally molded with the mounting bridge piece, and the case is inserted into the central fitting hole of the stator member to form the central portion. An axial position of the stator member with respect to the case is set by contacting a bridge piece portion of the mounting bridge piece with a top portion of the case exposed axially outward from the fitting hole. The motor-operated valve according to claim 1. 5. The mounting bridge piece has a pair of locking hanging pieces at the central portion of the bridge piece, and the locking hanging pieces and the outer peripheral surface of the case have an uneven shape. The stator positioning shape portion is formed, the distance between the pair of locking hanging pieces in the free state in the free state is smaller than the outer diameter of the case, and the spring property is obtained by elastic deformation of the locking hanging pieces. 5. The motor-operated valve according to claim 4, wherein the locking hanging piece is pressed against the outer peripheral surface of the case by the pressing, and the positioning positioning portion for the stator is engaged in a concavo-convex shape by the pressing. 6. The mounting bridge piece includes a spring piece portion formed by a C-shaped or a U-shaped slit formed in each of the leg piece portions at an opening formed in the leg piece portions. The stator positioning shape portion having an uneven shape is formed on the outer peripheral surface portion, and the spring piece portion is pressed against the outer peripheral surface of the case by the spring property obtained by elastic deformation of the spring piece portion, and by the pressing, the stator positioning portion is formed. The motor-operated valve according to claim 4, wherein the positioning shape portion is engaged in a concavo-convex shape. 7. A hook-shaped mount piece is fixed to one end of the stator member, the stator positioning shape portion is integrally formed with the mount bridge piece, and the case is formed in the central fitting hole of the stator member. Is inserted, and the mount piece is brought into contact with the top of the case exposed axially outward from the central fitting hole, whereby the axial position of the stator member with respect to the case is set. The motor-operated valve according to claim 1. 8. A guide support fixed in the case and including a shaft-shaped portion extending in the axial direction of the rotor; and a guide support arranged so as to surround the outer periphery of the shaft-shaped portion at an end portion in the axial direction. A coil spring-shaped spiral guide wire body having a stopper wire body portion extended in the axial direction, and being guided by the spiral guide wire body by being engaged with the spiral guide wire body and being rotationally driven by the rotor. While rotating, it moves in the axial direction of the spiral guide wire and hits the stopper wire portion of the spiral guide wire to stop further rotation and mechanically set the origin position of the rotor. And a movable stopper member, and a guide support positioning shape part that sets a circumferential mounting position of the guide support with respect to the case in relation to a circumferential position of the stator member positioning shape part. The mounting position of the guide support in the circumferential direction with respect to the case is set by mutual engagement of the guide support positioning portion formed on the guide support and the case. The motor-operated valve according to claim 1. 9. A predetermined number of dimples are press-molded on the case, and the dimples form the positioning shape portion for the stator on the outer peripheral surface side of the case, and the positioning shape for the guide support body on the inner peripheral surface side of the case. The motor-operated valve according to claim 8, wherein the motor-operated valve forms a part. 10. A motor-operated valve in which a rotor is rotatably housed in a case made of a non-magnetic material, and a stepping motor in which a stator member is arranged outside the case drives the valve element to open and close by rotation of the rotor. The case has a cup shape with a cylindrical cross section, the stator member is fitted to the outer periphery of the case through a central fitting hole having a circular cross section, and is fixed to the stator member at one end of the stator member. A gate-shaped mounting bridge piece extending over the central fitting hole in the radial direction is provided, the bridge member for connecting the two leg pieces, and the bridge piece connecting the both leg pieces. The case is inserted into the central fitting hole, and the bridge piece portion of the mounting bridge piece is brought into contact with the top portion of the case exposed axially outward from the central fitting hole, whereby Electric valve, characterized in that the set axial position relative to the casing of the motor member. 11. A gate-shaped mounting bridge piece has locking piece portions at the ends of both leg pieces, and a pair of locking groove portions having a lateral L-shaped transverse cross section are formed on one end surface of the stator member. The locking piece portions at both ends of the mounting bridge piece are engaged with the locking groove portions by the springiness of the mounting bridge piece itself, whereby the mounting bridge piece is fixed to the stator member. The motor-operated valve according to any one of claims 4, 5, 6, and 10, wherein: 12. A motor-operated valve in which a rotor is rotatably housed in a case made of a non-magnetic material, and a stepping motor having a stator member arranged outside the case rotates the rotor to open and close the valve body. The case has a cup shape with a cylindrical cross section, the stator member is fitted to the outer periphery of the case through a central fitting hole having a circular cross section, and a hook-shaped mount piece is fixed to one end of the stator member. The case is inserted into the central fitting hole of the stator member, and the mount piece abuts on the top of the case exposed axially outward from the central fitting hole, whereby the stator member An electrically operated valve in which an axial position with respect to the case is set. 13. The hook-shaped mount piece has a flat plate-shaped mounting board portion, and a hook-shaped piece portion is erected from the mounting board portion, and a pair of lateral rolls formed on one end surface of the stator member. The slide guides having an L-shaped cross-section are inserted and mounted in a sliding manner between the slide guides, and the stoppers are brought into contact with each other to lock in the inserting direction.
The electric valve described in 2.