JP2020180659A - Valve element driving device - Google Patents

Abstract

To provide a valve element driving device that can enhance a degree of freedom of design of a valve element.SOLUTION: A valve element driving device 100 comprises a driving part 1a, and a valve element 50 to be driven by the driving part 1a and linearly moved in a direction of an axis L. The valve element 50 comprises a first member 51 comprising a valve seat contact part 50c capable of coming into contact with a valve seat 200, and a second member 52 connected to the first member 51 at another side Lb in the direction of the axis L. The second member 52 is mechanically connected to the driving part 1a, and constitutes a feed screw mechanism 5 together with a rotating shaft 31 of the driving part 1a. Therefore, the first member 51 and the second member 52 can be made of different materials. For example, the first member 51 is made of metal, the second member 52 is a resin portion 53 when insert molding of the first member 51 is performed, and the first member 51 is provided with a retaining part 516 engaged with the resin portion 53 in the direction of the axis L, and a detent part 517 engaged with the resin portion 53 in a circumferential direction.SELECTED DRAWING: Figure 3

Description

The present invention relates to a valve body driving device that directly moves a valve body.

As a valve body driving device, a configuration in which the valve body is directly moved has been proposed (see Patent Document 1). In the valve body driving device described in Patent Document 1, the valve body is directly moved by the rotation of the rotating shaft of the motor used as the driving unit. In the valve body driving device described in Patent Document 1, since the valve body is directly moved by the rotation of the rotation shaft of the motor, the tip portion of the valve body becomes a valve seat contact portion capable of contacting the valve seat. A female screw that mechanically connects to the rotating shaft is formed on the rear end side of the valve body.

JP-A-2018-148658

When the whole body is integrally formed like the valve body described in Patent Document 1, there are problems that the restrictions are large and the degree of freedom in design is low. For example, in the case of the configuration described in Patent Document 1, there is a restriction that the tip portion provided with the valve seat contact portion and the rear end portion on which the female screw is formed must be made of the same material. Further, in order to integrally mold the valve body, there is a restriction that an expensive mold such as a slide mold must be used.

In view of the above problems, an object of the present invention is to provide a valve body driving device capable of increasing the degree of freedom in designing the valve body.

In order to solve the above problems, the valve body driving device according to one aspect of the present invention includes a driving unit and a valve body driven by the driving unit and linearly moving in the axial direction. A first member having a valve seat contact portion capable of contacting the valve seat, and a second member that is coupled to the first member on the other side in the axial direction and mechanically connected to the drive portion. It is characterized by having.

In the present invention, since the valve body has a structure in which the first member provided with the valve seat contact portion and the second member mechanically connected to the drive portion are combined, the first member and the second member Each member can be configured separately. Therefore, since there is no restriction that the first member and the second member must be manufactured collectively from the same material, the degree of freedom in designing the valve body can be increased.

In the present invention, one of the first member and the second member may be a resin portion when the other member is insert-molded. For example, the aspect in which the one member is the second member and the other member is the first member can be adopted.

In the present invention, the first member includes a first convex portion protruding on one side in the axial direction, and the valve seat contact portion is a conical surface formed on the outer peripheral surface of the first convex portion. Certain embodiments can be adopted.

In the present invention, the drive unit is a motor provided with a rotating shaft having a spiral groove formed on the outer peripheral surface, and the second member has a female screw that engages with the spiral groove to form a feed screw mechanism. The formed embodiment can be adopted.

In the present invention, the first member is formed with a concave portion that opens toward the other side in the axial direction, and the second member has a second convex portion located inside the concave portion and a concave portion in the axial direction. It is possible to adopt an embodiment in which a hole is formed that opens toward the other side and reaches the inside of the second convex portion, and the female screw is formed on the inner peripheral surface of the hole.

In the present invention, the second member includes a first tubular portion extending in the axial direction and a second tubular portion extending in the axial direction inside the first tubular portion, and the second tubular portion. The inside of the tubular portion is the hole, and the valve body is aligned between the first tubular portion and the second tubular portion while preventing the valve body from rotating with the rotating shaft. A mode in which a guide member for guiding in the direction is arranged can be adopted.

In the present invention, it is possible to adopt an embodiment in which the first member includes a retaining portion that engages with the resin portion in the axial direction. In the present invention, it is possible to adopt an embodiment in which the retaining portion is formed in a flange shape protruding outward in the radial direction.

In the present invention, it is possible to adopt an embodiment in which the first member includes a detent portion that engages with the resin portion in the circumferential direction. In the present invention, the detent portion may be an opening that penetrates in the axial direction.

In the present invention, since the valve body has a structure in which the first member provided with the valve seat contact portion and the second member mechanically connected to the drive portion are combined, the first member and the second member Each member can be configured separately. Therefore, since there is no restriction that the first member and the second member must be manufactured collectively from the same material, the degree of freedom in designing the valve body can be increased.

The perspective view of the valve body drive device to which this invention is applied seen from the side where the valve body is located. An exploded perspective view of the valve body driving device shown in FIG. 1 as viewed from the side opposite to the side where the valve body is located. FIG. 3 is a cross-sectional view of the valve body driving device shown in FIG. An exploded perspective view of the motor shown in FIG. An exploded perspective view of the valve body shown in FIG. FIG. 5 is a cross-sectional view of the valve body shown in FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Overall configuration of motor)
FIG. 1 is a perspective view of a valve body driving device 100 to which the present invention is applied as viewed from the side where the valve body 50 is located. FIG. 2 is an exploded perspective view of the valve body driving device 100 shown in FIG. 1 as viewed from the side opposite to the side where the valve body 50 is located. FIG. 3 is a cross-sectional view of the valve body driving device 100 shown in FIG. FIG. 4 is an exploded perspective view of the motor 1 shown in FIG. In the valve body 50 shown in FIG. 3, the first member 51, which will be described later, is provided with a downward-sloping diagonal line, and the second member 52 is provided with an upward-sloping diagonal line.

The valve body driving device 100 shown in FIG. 1 includes a valve body 50 and a motor 1 as a driving unit 1a, and the motor 1 is a motor as described below with reference to FIGS. 2 to 4. It includes a case 10, a stator 20, a rotor 30, a bobbin 40 having a terminal block 45, a cover 60, a sealing resin body 70, and the like. The valve body driving device 100 drives, for example, the valve body 50 of the air-fuel mixture flow rate adjusting device of a gasoline engine. Therefore, since the motor 1 is required to have high airtightness when attached to the air-fuel mixture flow rate adjusting device, the motor 1 is configured as a closed motor.

As shown in FIGS. 2, 3 and 4, the motor case 10 is formed in a cup shape by a magnetic metal such as iron so as to cover the stator 20 from one side La in the axis L direction. More specifically, the motor case 10 has an end plate portion formed so as to close the opening of the body portion 11 extending cylindrically in the axis L direction and one side La of the body portion 11 in the axis L direction. It has 12 and. In the motor case 10, the other side Lb of the body portion 11 in the axis L direction is an opening 111, and the opening 111 is formed with a flange portion 13 projecting outward in the radial direction.

In this embodiment, the motor 1 is a stepping motor. The stator 20 is a tubular body arranged in the motor case 10, and includes a coil 21, a bobbin 40, a yoke 23 (outer stator core), and a yoke 24 (inner stator core). The yokes 23 and 24 are arranged so as to face each other so that the polar teeth 25 are alternately arranged in the circumferential direction, and two sets of the yokes 23 and 24 are arranged in the L direction of the axis.

The rotor 30 includes a rotating shaft 31 extending in the L direction of the axis and a cylindrical permanent magnet 32 fixed to the outer peripheral surface of the rotating shaft 31, and the outer peripheral surface of the permanent magnet 32 is provided in the circumferential direction. The north and south poles are magnetized alternately. Of the rotor 30, the permanent magnet 32 faces the pole teeth 25 of the stator 20 in the radial direction.

A hole 120 is formed in the end plate portion 12 of the motor case 10, and a part of the rotating shaft 31 protrudes from the hole 120 toward one side La in the axis L direction. A bearing 97 is held in the hole 120, and a washer 98 is arranged so as to overlap the bearing 97 on the other side Lb in the L direction of the axis. The portion of the rotating shaft 31 that protrudes from the end plate portion 12 of the motor case 10 is an output shaft 39 having a spiral groove 310 formed on the outer peripheral surface.

The bobbin 40 is, for example, a resin molded product obtained by molding the yokes 23 and 24 with a synthetic resin, and is configured by insert injection molding in the mold with the yokes 23 and 24 inserted in the mold. The synthetic resin covers the outer peripheral portions of the yokes 23 and 24 and the portion excluding the inner peripheral surface of the polar teeth 25, and the coil 21 is wound between the portions (flange portions) overlapping the yokes 23 and 24. The space to be used is configured.

A terminal block 45 is integrally formed at the end of the other side Lb of the bobbin 40 in the axis L direction, and the terminal block 45 is provided with a lid portion 453 with which the flange portion 13 of the motor case 10 abuts. .. A plurality of terminal pins 80 extending in the first direction X orthogonal to the axis L direction are held in the terminal block 45 so as to be parallel to the second direction Y orthogonal to the axis L direction and the first direction X. ing. In the present embodiment, the intermediate portion of the terminal pin 80 is bent toward one side La in the axis L direction. Therefore, the terminal pin 80 is held inside the terminal holding groove 48 formed along the side surface 452 from the bottom 450 of the terminal block 45. The first end 81, which is one end of the terminal pin 80, protrudes from one side surface 451 of the first direction X of the terminal block 45, and the end (not shown) of the coil wire constituting the coil 21 is welded. It is connected by soldering or soldering. The first end 81 is covered by a cover 60 supported by the bobbin 40. The second end 82, which is the other end of the terminal pin 80, is a terminal for external connection protruding from the other side surface 452 of the first direction X of the terminal block 45, and is used for electrical connection with the outside.

In the terminal block 45, a portion adjacent to the lid portion 453 on one side La in the axis L direction is a flange portion 456, and the flange portion 456 overlaps the inner peripheral surface of the body portion 11 of the motor case 10. A notch 456a is formed on the side of the flange portion 456 where the cover 60 is located. Further, a recess 453a is formed on the surface of the lid portion 453 on one side La in the axis L direction on the side where the cover 60 is located.

A bearing hole 46 recessed in the other side Lb in the axis L direction is formed in a portion of the terminal block 45 located on one side La in the axis L direction. A tubular bearing 96 is arranged inside the bearing hole 46, and the bearing 96 supports the outer peripheral surface of the rotating shaft 31. At the bottom of the bearing hole 46, a thrust support portion 95 made of a metal sphere 950 is supported, and the end of the other side Lb of the rotating shaft 31 in the axis L direction is supported from the other side Lb in the axis L direction. doing.

(Structure of cover 60)
The cover 60 is a resin molded product, and has a facing portion 61 facing the side surface 451 of the terminal block 45, and a second portion of the facing portion 61 protruding from the end of one side La in the axis L direction to one side La in the axis L direction. It has one protruding portion 62 and a second protruding portion 63 protruding toward the terminal block 45 from the end of the other side Lb of the facing portion 61 in the axis L direction. The first protruding portion 62 has a convex portion 621 protruding on one side La in the axis L direction. Therefore, when the cover 60 is pushed toward the terminal block 45 so that the convex portion 621 is inside the opening 111 of the motor case 10, the convex portion 621 fits into the notch 456a of the flange portion 456 of the terminal block 45. The first protruding portion 62 fits into the recess 453a of the lid portion 453. In this way, the cover 60 is positioned on the motor case 10 and the terminal block 45. In this state, the second protruding portion 63 overlaps a part of the bottom portion 450 of the terminal block 45 from the other side Lb in the axis L direction.

The wall surface of the facing portion 61 facing the side surface 451 is formed with recesses 611 into which the first end portions 81 of the four terminal pins 80 are inserted, so that the first end portion 81 does not come into contact with the cover 60. It has become. A plurality of plate portions 64 protruding from one side La in the axis L direction are formed in the second protrusion 63, and the second protrusion 63 is formed from the other side Lb in the axis L direction to the bottom 450 of the terminal block 45. When partially overlapped, the plate portion 64 overlaps with the terminal pin 80 in the terminal holding groove 48. In this state, the other parts of the terminal pin 80 are exposed from the cover 60, but when the sealing resin body 70 is provided, the portion of the terminal pin 80 exposed from the cover 60 is covered with the cover 60. The portion except the second end portion 82 and the portion other than the second end portion 82 are covered with the sealing resin body 70.

(Structure of sealing resin body 70)
In the motor 1 configured in this way, the opening 111 in the axis L direction of the motor case 10 is closed by the lid portion 453 of the terminal block 45 integrally formed with the bobbin 40 and the cover 60, and in this state, the terminals The ends of the base 45, the cover 60, and the motor case 10 in the axis L direction are covered with the sealing resin body 70. The sealing resin body 70 has a bottom wall 73 that covers the terminal block 45 and the cover 60 on the other side Lb in the axis L direction, and a body portion 72 that covers the terminal block 45, the cover 60, and the motor case 10 from the side surface. There is. The bottom wall 73 is provided with a convex portion 75 that abuts on the wall surface of a step portion or a hole on the device side to position the motor 1 when the motor 1 is mounted on the device.

The second end 82 of the terminal pin 80 projects from the wall surface 76 of the sealing resin body 70. The sealing resin body 70 is provided with a tubular connector housing 78 so as to surround the portion where the terminal pins 80 are arranged (around the wall surface 76), and the connector housing 78 is provided with a connector (not shown). ) Is inserted to make an electrical connection between the terminal pin 80 and the terminal of the connector. In this embodiment, the connector is a waterproof connector.

The sealing resin body 70 is a resin portion 71 formed so as to cover the end of the terminal block 45, the cover 60, and the other side Lb of the motor case 10 in the axial L direction at the final stage of the assembly process, and is thermoplastic. It consists of resin or thermosetting resin. The sealing resin body 70 is firmly fixed to the motor case 10 in a state where the opening 111 and the like of the motor case 10 are completely sealed. In this state, most of the motor case 10 is exposed except for the portion located on the other side Lb in the axis L direction.

In the body portion 72 of the sealing resin body 70, the surface of the motor case 10 facing one side La in the axis L direction is a flange surface 77 for attaching to the air-fuel mixture flow rate adjusting valve. The flange surface 77 is formed by a plane orthogonal to the axial direction of the motor case 10, and when the motor case 10 is brought into close contact with the mounting surface surrounding the opening of the air-fuel mixture flow control valve, for example, a sealing member such as an O-ring. Maintains airtightness through.

(Structure of valve body 50 and feed screw mechanism 5)
The valve body 50 is a tubular member arranged on the outer side in the radial direction of the rotating shaft 31, and the end portion of La on one side in the axis L direction is closed. In the present embodiment, the valve body 50 includes a tip portion 56 whose outer peripheral surface is a first conical surface 50a, a first cylinder portion 57 extending from the tip portion 56 to the other side Lb in the axis L direction, and a first cylinder. It has a second tubular portion 58 extending from the tip portion 56 to the other side Lb in the axis L direction inside the tubular portion 57, and an outer peripheral surface located between the tip portion 56 and the first tubular portion 57. Is a second conical surface 50b whose angle formed with respect to the axis L is larger than that of the first conical surface 50a.

The inside of the second cylinder portion 58 is a hole 585 into which the rotating shaft 31 is fitted. A female screw 580 is formed on the inner peripheral surface of the second tubular portion 58 (the inner peripheral surface of the hole 585), and the female screw 580 meshes with the spiral groove 310 of the rotating shaft 31. Therefore, the valve body 50 is configured as a nut member. Therefore, the valve body 50 is driven by the drive unit 1a (motor 1) and moves linearly in the axis L direction.

A tubular guide member 91 that guides the valve body 50 in the axis L direction is arranged between the first tubular portion 57 and the second tubular portion 58 while preventing the valve body 50 from rotating with the rotating shaft 31. Has been done. The guide member 91 is temporarily fixed by fitting a convex portion 917 projecting to the other side Lb in the axis L direction into a hole 127 formed in the end plate portion 12 of the motor case 10 and temporarily fixing the guide member 91 in the axis L direction of the guide member 91. The convex portion 916 protruding from the other side Lb of the motor case 10 is fitted into the hole 126 formed in the end plate portion 12 of the motor case 10 and is fixed by caulking. Further, in the guide member 91, the holes 910 into which the second cylinder portion 58 is fitted and the outer peripheral surfaces of the second cylinder portion 58 are partially flat surfaces 911 and 581 (see FIG. 2) in the circumferential direction, respectively. It is possible to prevent the valve body 50 from rotating with the rotating shaft 31. A coil spring 92 for preventing backlash between the spiral groove 310 of the rotating shaft 31 and the female screw 580 of the valve body 50 is arranged between the guide member 91 and the first tubular portion 57.

In this way, the feed screw mechanism 5 that converts the rotation of the rotating shaft 31 into the linear motion of the valve body 50 is configured, and as shown by the alternate long and short dash line in FIG. 3, the valve body 50 is placed on one side of the axis L direction. When moved to La, the conical outer peripheral surface (first conical surface 50a) of the tip portion 56 abuts on the valve seat 200 surrounding the opening 210 of the flow path as the valve seat contact portion 50c. Here, a second conical surface 50b having an angle formed with respect to the axis L larger than that of the first conical surface 50a is connected to the other side Lb of the first conical surface 50a in the axis L direction. Therefore, when the valve body 50 slightly recedes from the position shown by the alternate long and short dash line to the other side Lb in the axis L direction, the fluid flows along the second conical surface 50b. Therefore, since the fluid resistance changes depending on the position of the valve body 50 in the axis L direction, the flow rate can be adjusted.

Although not shown, when the valve body 50 is moved to one side La in the axis L direction, the second conical surface 50b serves as the valve seat contact portion 50c, and the valve seat 200 surrounds the opening 210 of the flow path. It may be in a mode of contacting with. In this case, since the second conical surface 50b has a larger angle with respect to the axis L than the first conical surface 50a, there is an advantage that sticking when the valve body 50 comes into contact with the valve seat 200 can be suppressed. is there.

(Detailed configuration of valve body 50)
FIG. 5 is an exploded perspective view of the valve body 50 shown in FIG. FIG. 6 is a cross-sectional view of the valve body 50 shown in FIG. As shown in FIGS. 3, 5 and 6, the valve body 50 has a first member 51 having a valve seat contact portion 50c and a first member 51 at the other side Lb of the first member 51 in the axial L direction. It has a tubular second member 52 coupled with the motor 1, and the second member 52 is mechanically connected to the motor 1 (drive unit 1a).

More specifically, the first member 51 includes a rear end portion 511 having a portion 50b1 of the second conical surface 50b corresponding to one side La in the axis L direction, and a rear end portion 511 in the axis L direction. It is provided with a first convex portion 512 protruding from one side La, and the first convex portion 512 is a tip portion 56 of the valve body 50. Therefore, the outer peripheral surface of the first convex portion 512 is the first conical surface 50a (valve seat contact portion 50c).

The second member 52 has an end plate portion 521 having a portion 50b2 corresponding to one side La in the axis L direction of the second conical surface 50b, and the second member 52 has an end plate portion 521 from the end plate portion 521. The first cylinder portion 57 and the second cylinder portion 58 extend to the other side Lb in the axis L direction. Therefore, the female screw 580 mechanically connected to the rotating shaft 31 is provided on the side of the second member 52.

In this embodiment, one of the first member 51 and the second member 52 is a resin portion 53 when the other member is insert-molded. In the present embodiment, of the first member 51 and the second member 52, the second member 52 is one member, and the second member 52 is a resin portion when the first member 51, which is the other member, is insert-molded. 53.

The first member 51 is formed with a recess 513 that opens toward the other side Lb in the axis L direction. Therefore, the second member 52 includes a second convex portion 523 located inside the concave portion 513, and the hole 585 that opens toward the other side Lb in the axis L direction reaches the inside of the second convex portion 523. doing. Therefore, since the female screw 580 formed on the inner peripheral surface of the hole 585 extends to the inside of the second convex portion 523, the valve body 50 does not have to lengthen the dimension in the axis L direction of the valve body 50. The stroke in the L direction of the axis can be extended.

The first member 51 includes a retaining portion 516 that engages with the resin portion 53, which is the second member 52, in the L direction of the axis. In the present embodiment, the rear end portion 511 of the first member 51 has a flange-shaped annular portion 516a extending radially outward from the outer peripheral surface extending in parallel with the axis L, and the resin portion 53 is a resin portion 53. It covers the annular portion 516a from both sides in the axis L direction and engages in the axis L direction. Therefore, the annular portion 516a constitutes a retaining portion 516 that prevents the first member 51 from coming off from the second member 52.

The first member 51 includes a detent portion 517 that engages with the resin portion 53 in the circumferential direction. In the present embodiment, the annular portion 516a of the first member 51 is formed with openings 517a penetrating the annular portion 516a along the axis L at a plurality of locations in the circumferential direction, and the resin portion 53 is formed of the opening 517a. It is formed to the inside and engages in the circumferential direction. Therefore, the opening 517a constitutes a detent portion 517 that prevents the first member 51 from rotating in the circumferential direction with respect to the second member 52.

(Main effect of this form)
As described above, in the present embodiment, the valve body 50 has a structure in which the first member 51 having the valve seat contact portion 50c and the second member 52 mechanically connected to the drive portion 1a are combined. Therefore, the first member 51 and the second member 52 can be configured separately. Therefore, since there is no restriction that the first member 51 and the second member 52 must be manufactured collectively from the same material, the degree of freedom in designing the valve body 50 can be increased.

For example, even if the valve body 50 has a structure in which it is difficult to collectively manufacture the entire valve body 50 by resin molding, or the valve body 50 has a structure in which an expensive slide type needs to be used, the first member 51 If it is divided into the second member 52, restrictions on the structure of the valve body 50 can be relaxed, so that the degree of freedom in designing the valve body 50 can be increased.

Further, since the first member 51 and the second member 52 can be made of different materials, the degree of freedom in designing the valve body 50 can be increased. For example, in this embodiment, the first member 51 is made of metal and the second member 52 is made of resin. Further, the first member 51 and the second member 52 can be made of different resin materials.

Further, after the first member 51 is manufactured, the second member 52 can be the resin portion 53 when the first member 51 is insert-molded. Therefore, even if the shape and size of the valve seat contact portion 50c, the inclination angle of the first conical surface 50a, and the like differ depending on the specifications of the valve body driving device 100, the design of the first member 51 is changed. When the design-changed first member 51 is insert-molded, the second member 52 (resin portion 53) can have the same structure before and after the design change of the first member 51.

(Other embodiments)
In the above embodiment, the second member 52 is the resin portion 53 when the first member 51 is insert-molded, but the first member 51 may be the resin portion 53 when the second member 52 is insert-molded. ..

In the above embodiment, the motor 1 is a stepping motor, but the present invention may be applied when another type of motor is used. Further, although the motor 1 is used for the drive unit 1a in the above embodiment, the present invention may be applied when a solenoid is used for the drive unit 1a.

1 ... motor, 1a ... drive unit, 5 ... feed screw mechanism, 10 ... motor case, 521 ... end plate part, 20 ... stator, 30 ... rotor, 31 ... rotating shaft, 39 ... output shaft, 40 ... bobbin, 45 ... Terminal block, 50 ... valve body, 50a ... first conical surface, 50b ... second conical surface, 50c ... valve seat contact portion, 51 ... first member, 52 ... second member, 53 ... resin portion, 56 ... tip Part, 57 ... 1st cylinder part, 58 ... 2nd cylinder part, 60 ... cover, 70 ... sealing resin body, 80 ... terminal pin, 91 ... guide member, 92 ... coil spring, 100 ... valve body drive device, 517a ... Opening, 580 ... Female screw, 585 ... Hole, 200 ... Valve seat, 310 ... Spiral groove, 513 ... Concave, 511 ... Rear end, 512 ... First convex part, 516 ... Retaining part, 516a ... Circular part, 517 ... Anti-rotation part, 523 ... Second convex part, 580 ... Female screw, L ... Axis

Claims (11)

With the drive unit
A valve body that is driven by the drive unit and moves linearly in the axial direction,
Have,
The valve body is coupled to a first member having a valve seat contact portion capable of contacting the valve seat and the first member on the other side in the axial direction, and is mechanically connected to the drive portion. A valve body driving device characterized by having two members. In the valve body driving device according to claim 1,
A valve body driving device, characterized in that one of the first member and the second member is a resin portion when the other member is insert-molded. In the valve body driving device according to claim 2,
The one member is the second member.
The valve body driving device, wherein the other member is the first member. In the valve body driving device according to claim 2 or 3,
The first member includes a first convex portion projecting to the one side in the axial direction.
The valve seat contact portion is a valve body driving device having a conical surface formed on the outer peripheral surface of the first convex portion. The valve body driving device according to any one of claims 2 to 4.
The drive unit is a motor provided with a rotating shaft having a spiral groove formed on its outer peripheral surface.
A valve body driving device characterized in that the second member is formed with a female screw that engages with the spiral groove to form a feed screw mechanism. In the valve body driving device according to claim 5,
The first member is formed with a recess that opens toward the other side in the axial direction.
The second member is formed with a second convex portion located inside the concave portion and a hole that opens toward the other side in the axial direction and reaches the inside of the second convex portion.
A valve body driving device characterized in that the female screw is formed on the inner peripheral surface of the hole. In the valve body driving device according to claim 6,
The second member includes a first tubular portion extending in the axial direction and a second tubular portion extending in the axial direction inside the first tubular portion.
The inside of the second cylinder portion is the hole.
A guide member for guiding the valve body in the axial direction while preventing the valve body from rotating with the rotation shaft is arranged between the first cylinder portion and the second cylinder portion. A valve body drive device characterized by. In the valve body driving device according to any one of claims 2 to 7.
The valve body driving device is characterized in that the first member includes a retaining portion that engages with the resin portion in the axial direction. In the valve body driving device according to claim 8,
The valve body driving device is characterized in that the retaining portion is formed in a flange shape protruding outward in the radial direction. In the valve body driving device according to any one of claims 2 to 9,
The valve body driving device is characterized in that the first member includes a detent portion that engages with the resin portion in the circumferential direction. In the valve body driving device according to claim 10,
The valve body driving device is characterized in that the detent portion is an opening that penetrates in the axial direction.

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