JP2015206442A - fluid control valve and valve stem - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fluid control valve which is easy in the processing of a valve stem, can shorten the valve stem while securing a length of a male screw, and can reduce a physique by the shortening amount.SOLUTION: An EGR valve 1 converts the rotation of a rotor 23 into the reciprocating motion of a valve stem 6 via a female screw 31 and a male screw 8, and adjusts an opening of a valve body 5 with respect to a valve seat 4. The valve stem 6 is constituted of a shaft body 16 including the male screw 8, and a spring receiver 9 which is formed differently from the shaft body 16. The spring receiver 9 includes a cylinder part 9a which is pressure-inserted into an upper part of the shaft body 16, a flange part 9b which is formed integrally at the cylinder part 9a, and a stopper 10 which is integrally formed at the flange part 9b. The cylinder part 9a includes a base part at which the flange part 9b is formed, and a sleeve part extending from the base part. In order to regulate the relative rotation of the base part and the shaft body 16, an engagement part and an engaged part are arranged at the base part and the shaft body 16. A two-face width part 9aba whose lateral cross section is formed into a substantially-oval shape is formed at an external periphery of the sleeve part, and the two-face width part 9aba conforms to a rotation regulation part 11a of a thrust bearing 11.

Description

  The present invention relates to a fluid control valve that is used to control a fluid and is configured as a poppet valve and an electric valve, and a valve shaft used in the fluid control valve.

  Conventionally, as this type of technology, for example, an EGR valve described in Patent Document 1 below is known. FIG. 14 shows the EGR valve 51 in a sectional view. The EGR valve 51 is configured as a poppet valve and an electric valve. That is, the EGR valve 51 includes a housing 53 having a flow path 52, a valve seat 54 provided in the flow path 52, a valve body 55 provided so as to be seated on the valve seat 54 in the housing 53, A valve shaft 56 for causing the valve body 55 to reciprocate (stroke) in a straight line and a step motor 57 for moving the valve shaft 56 in the axial direction thereof are provided.

  The valve body 55 is fixed to the lower end portion of the valve shaft 56. The valve shaft 56 is provided with a male screw 58 at the upper end, and a spring receiver 59 is provided adjacent to the male screw 58. A protruding stopper 60 is provided on the end surface of the spring receiver 59 facing the male screw 58. The valve shaft 56 is formed with a two-sided width portion 61 having a substantially oval cross section on the outer periphery of a portion adjacent to the spring receiver 59. The housing 53 is provided with a thrust bearing 62 for supporting the valve shaft 56 so as to be movable in the axial direction. On the inner periphery of the thrust bearing 62, a rotation restricting portion 62a that has a substantially oval cross section and can be engaged with the two-surface width portion 61 of the valve shaft 56 is formed. A compression spring 63 that biases the valve body 55 and the valve shaft 56 in a direction in which the valve body 55 is seated on the valve seat 54 is provided between the spring receiver 59 and the housing 53.

  Step motor 57 includes a magnet rotor 65 having a female screw 64 that is screwed into male screw 58. The EGR valve 51 drives the step motor 57 to rotate the magnet rotor 65, thereby converting the rotational motion into the stroke motion of the valve shaft 56 via the female screw 64 and the male screw 58, and the valve body with respect to the valve seat 54. The opening degree of 55 is adjusted. Here, an engaging portion 65 a that engages with the stopper 60 of the spring receiver 59 is formed below the magnet rotor 65. When the EGR valve 51 is fully closed, the valve body 55 is seated on the valve seat 54, and the magnet rotor 65 further rotates in the closing direction, so that the stopper 60 is engaged with the engaging portion 65a, and the valve shaft 56 is initially attached. The position is regulated.

  The above-described valve shaft 56 having the spring receiver 59 is integrally formed by pressing a shaft material. The male screw 58 is formed by rolling.

JP 2013-7266 A

However, in the valve shaft 56 described in Patent Document 1, since the spring receiver 59 including the stopper 60 is formed integrally with the male screw 58, when the male screw 58 is rolled onto the shaft member, the stopper on the upper surface of the spring receiver 59 is provided. 60 was in the way, and the screw could not be rolled up to the upper surface of the spring receiver 59. That is, in the vicinity of the stopper 60, a screw-free portion (unthreaded portion) 56a is formed on the shaft member. Therefore, in order to ensure a predetermined length for the male screw 58 above the spring receiver 59, the entire length of the valve shaft 56 must be increased by the amount of the non-threaded portion 56a. As a result, the height dimension of the EGR valve 51 has to be increased by an amount corresponding to the unthreaded portion 56a. Further, in order to prevent the valve shaft 56 from rotating with respect to the thrust bearing 62, it is necessary to press a part of the valve shaft 56 into a substantially oval cross section, but the same shaft material together with the male screw 58 and the spring receiver 59 is required. The shaft material had to be processed and there was a risk of buckling, and the processing was not easy.

  The present invention has been made in view of the above circumstances, and provides a fluid control valve capable of easily machining a valve shaft, shortening the valve shaft while ensuring the length of the male screw, and reducing the physique accordingly. There is to do. Another object of the present invention is to provide a valve shaft that can be easily processed and can shorten the overall length while ensuring the length of the male screw.

  In order to achieve the above object, a first aspect of the present invention includes a housing having a flow path, a valve seat provided in the flow path, a valve body provided to be seatable on the valve seat, and a valve A valve shaft for reciprocating the body linearly, the valve shaft includes one end and the other end, the valve body is fixed to the one end, and the valve shaft has a male screw at the other end. A spring receiver is provided adjacent to the male screw, a protrusion having a protruding shape is provided on the end surface of the spring receiver facing the male screw, and a cross-section having a specific shape on the outer periphery of the portion adjacent to the spring receiver. The width portion is formed, and the housing is provided with a thrust bearing for supporting the valve shaft so as to be movable in the axial direction. The inner circumference of the thrust bearing has a specific shape in cross section, and the surface width portion. A rotation restricting portion that can be engaged with the spring, and a spring receiver A compression spring that urges the valve body and the valve shaft in a direction in which the valve body is seated on the valve seat, an electric motor for reciprocating the valve shaft in the axial direction, and an electric screw A rotor having a female screw that is screwed to the valve, and by rotating the rotor by driving an electric motor, the rotary motion is converted into a reciprocating motion of the valve shaft via the female screw and the male screw. In the fluid control valve configured to adjust the opening of the body, the valve shaft includes a shaft body having a male screw provided at one end thereof, and a spring receiver formed separately from the shaft body. The receiver includes a cylindrical portion that is press-fitted onto the shaft body, a flange portion that is integrally formed at one end of the cylindrical portion, and a stopper that is integrally formed on one end surface of the flange portion. Large diameter with flange part formed at one end A base portion and a small-diameter sleeve portion extending in a direction away from the flange portion from the base portion, and an engaging portion is provided on one of the base portion and the shaft body to restrict relative rotation between the base portion and the shaft body. The engaged portion is provided on the other side, a surface width portion having a specific cross section is formed on the outer periphery of the sleeve portion, and the surface width portion is aligned with the rotation restricting portion of the thrust bearing.

  According to the configuration of the invention, the valve shaft includes the shaft body provided with the male screw and the spring receiver formed separately from the shaft body. The spring receiver includes a cylindrical portion that is press-fitted onto the shaft body, a flange portion that is integrally formed at one end of the cylindrical portion, and a stopper that is integrally formed on one end surface of the flange portion. Therefore, since the shaft body and the spring receiver are formed separately, each part can be easily processed. That is, in the shaft body, at one end portion thereof, there is no restriction of the stopper of the spring receiver, and the processing of the male screw is facilitated. In the spring receiver, the processing of the stopper on the flange portion and the processing of the surface width portion on the sleeve portion are facilitated without worrying about the buckling of the shaft body.

  In order to achieve the above object, the invention according to claim 2 is that, in the invention according to claim 1, the spring receiver is formed of a material softer than the shaft body.

  According to the configuration of the invention described above, in addition to the operation of the invention described in claim 1, since the spring receiver is made of a softer material than the shaft body, it is easy to press-fit the spring receiver into the shaft body.

  In order to achieve the above object, the invention according to claim 3 is a valve shaft used as a poppet valve and a fluid control valve configured as an electric valve, and a male screw is provided at one end. The shaft body and a spring receiver formed separately from the shaft body, the spring receiver is a cylinder portion press-fitted onto the shaft body, a flange portion formed integrally with one end of the cylinder portion, The cylindrical portion includes a large-diameter base portion formed at one end of the flange portion and a direction away from the flange portion from the base portion. A small-diameter sleeve extending to the base, and in order to restrict relative rotation between the base and the shaft, an engaging portion is provided on one of the base and the shaft, and an engaged portion is provided on the other. The width of the surface having a specific cross section is formed on the outer periphery of That.

  According to the configuration of the invention, the valve shaft includes the shaft body provided with the male screw and the spring receiver formed separately from the shaft body. The spring receiver includes a cylindrical portion that is press-fitted onto the shaft body, a flange portion that is integrally formed at one end of the cylindrical portion, and a stopper that is integrally formed on one end surface of the flange portion. Therefore, since the shaft body and the spring receiver are formed separately, each part can be easily processed. That is, in the shaft body, at one end portion thereof, there is no restriction on the stopper of the spring receiver, and the processing of the male screw is facilitated. In the spring receiver, the processing of the stopper on the flange portion and the processing of the surface width portion on the sleeve portion are facilitated without worrying about the buckling of the shaft body.

  In order to achieve the above object, the invention according to claim 4 is the invention according to claim 3, wherein the spring receiver is formed of a material softer than the shaft body.

  According to the configuration of the invention described above, in addition to the operation of the invention according to claim 3, since the spring receiver is made of a softer material than the shaft body, the press-fit of the spring receiver to the shaft body is facilitated.

  According to the first aspect of the present invention, the machining of the valve shaft can be facilitated, and the overall length of the valve shaft can be shortened while ensuring the length of the male screw, and the fluid control valve accordingly. The physique can be reduced.

  According to the invention described in claim 2, in addition to the effect of the invention described in claim 1, it is possible to facilitate the manufacture of the valve stem having a two-body structure.

  According to the third aspect of the present invention, the machining of the valve shaft can be facilitated, and the overall length of the valve shaft can be shortened while ensuring the length of the male screw.

  According to the invention described in claim 4, in addition to the effect of the invention described in claim 3, it is possible to facilitate the manufacture of the valve stem having a two-body structure.

The front sectional view showing an EGR valve at the time of full closure concerning one embodiment. The front view which concerns on one Embodiment and shows a valve stem. The left view which concerns on one Embodiment and shows a valve stem. The front view which concerns on one Embodiment and cuts and shows a valve shaft partially. The left view which concerns on one Embodiment and cuts and shows a valve shaft partially. The front view which concerns on one Embodiment and is a state which isolate | separated the shaft body and the spring receiver, and cut | disconnects and shows only a spring receiver. FIG. 7 is a cross-sectional view taken along the line AA of FIG. 6 showing the shaft body according to the embodiment. The BB sectional drawing of FIG. 6 which concerns on one Embodiment and shows a shaft. The top view which concerns on one Embodiment and shows a spring receiver. The CC sectional view taken on the line of FIG. 6 which shows a spring receiver concerning one Embodiment. The DD sectional view taken on the line of FIG. 6 which concerns on one Embodiment and shows a spring receiver. The perspective view which concerns on one Embodiment and shows a spring receiver. The perspective view which concerns on one Embodiment and shows the spring receiver cut | disconnected longitudinally. The front sectional view which concerns on a prior art example and shows an EGR valve.

  Hereinafter, an embodiment in which a fluid control valve and a valve shaft in the present invention are embodied as an exhaust gas recirculation valve (EGR valve) will be described in detail with reference to the drawings.

  FIG. 1 is a front sectional view of the EGR valve 1 when fully closed. The EGR valve 1 corresponding to a fluid control valve is provided in an EGR passage for returning a part of exhaust gas discharged from the engine to the intake passage as EGR gas, and is used for controlling the EGR gas flow rate. The EGR valve 1 includes a housing 3 having a flow path 2, a valve seat 4 provided in the flow path 2, a valve body 5 provided so as to be seatable with respect to the valve seat 4, and the valve body 5 in a straight line. A valve shaft 6 for reciprocating motion (stroke motion) and a step motor 7 for moving the valve shaft 6 along with the valve body 5 in the axial direction are provided. The step motor 7 corresponds to an example of the electric motor of the present invention.

  FIG. 2 is a front view of the valve shaft 6. FIG. 3 is a left side view of the valve shaft 6. As shown in FIGS. 1 to 3, the valve shaft 6 includes one end (lower end) and the other end (upper end), and the valve body 5 is fixed to the lower end. The valve shaft 6 is provided with a male screw 8 at the upper end, and a spring receiver 9 is provided adjacent to the male screw 8. On the end face of the spring receiver 9 facing the male screw 8, a stopper 10 having a protruding shape is provided. The spring receiver 9 is provided with a two-sided width portion 9aba (which will be described in detail later) having a substantially oval cross section as a specific shape on the outer periphery thereof.

  As shown in FIG. 1, both ends of the flow path 2 are an inlet 2a through which EGR gas is introduced and an outlet 2b through which EGR gas is led out. The valve seat 4 has a valve hole 4 a communicating with the flow path 2. The valve shaft 6 is disposed vertically through the housing 3. The valve body 5 fixed to the lower end portion of the valve shaft 6 has a substantially truncated cone shape, and comes into contact with or separates from the valve seat 4. The housing 3 is provided with a first thrust bearing 11 and a second thrust bearing 12 in series in order to support the valve shaft 6 so as to be movable in the axial direction. On the inner periphery of the first thrust bearing 11, a rotation restricting portion 11 a that has a substantially oval cross section and can be engaged with the two-surface width portion 9 aba of the spring receiver 9 is formed.

  As shown in FIG. 1, the step motor 7 includes a stator 22 including a coil 21 and a magnet rotor 23 provided inside the stator 22. These members 21 to 23 are molded and covered with a resin casing 24. The casing 24 is integrally formed with a connector 25 protruding laterally. The connector 25 is provided with a terminal 26 extending from the coil 21.

  As shown in FIG. 1, the magnet rotor 23 includes a rotor body 27 and a cylindrical plastic magnet 28 that is integrally provided outside the rotor body 27. A first radial bearing 29 is provided between the outer periphery of the upper end portion of the rotor body 27 and the casing 24. A second radial bearing 30 is provided between the inner periphery of the lower end of the plastic magnet 28 and the first thrust bearing 11. The magnet rotor 23 is rotatably supported inside the stator 22 by the upper and lower radial bearings 29 and 30. In the center of the rotor body 27, a female screw 31 is formed which is screwed into the male screw 8 of the valve shaft 6. A first compression spring 32 is provided between the magnet rotor 23 (plastic magnet 28) and the lower second radial bearing 30. Between the spring receiver 9 of the valve shaft 6 and the second radial bearing 30, that is, between the housing 3, the valve body 5 and the valve shaft 6 are attached in a direction in which the valve body 5 is seated on the valve seat 4. A second compression spring 33 is provided.

  As shown in FIG. 1, a substantially cylindrical lip seal 13 for sealing between the housing 3 and the valve shaft 6 is provided between the housing 3 and the valve shaft 6 on the second thrust bearing 12. Adjacent to each other. Further, between the housing 3 and the valve shaft 6, a deposition guard plug 14 having a substantially cylindrical shape for guarding between the housing 3 and the valve shaft 6 from the deposit is provided adjacent to the lip seal 13. .

  The EGR valve 1 drives the step motor 7 to rotate the magnet rotor 23, thereby converting the rotational motion into the stroke motion of the valve shaft 6 through the female screw 31 and the male screw 8, and the valve body with respect to the valve seat 4. It is comprised so that the opening degree of 5 may be adjusted. That is, as shown in FIG. 1, in the fully closed state where the valve body 5 is seated on the valve seat 4, the magnet rotor 23 rotates in one direction, so that the second screw screw 8 and the female screw 31 are engaged with each other. 1 against the urging force of the compression spring 33, while the valve shaft 6 rotates in one direction, performs a stroke motion in the downward direction of FIG. Due to the stroke movement of the valve shaft 6, the valve body 5 moves in a downward direction in FIG. 1 together with the valve shaft 6, and the valve body 5 is opened away from the valve seat 4.

  On the other hand, when the valve body 5 is fully opened from the valve seat 4 and the magnet rotor 23 rotates in the opposite direction, the screwed relationship between the male screw 8 and the female screw 31 and the second compression spring 33 Due to the urging force, the valve shaft 6 rotates in the opposite direction and moves in the upward direction in FIG. Due to the stroke movement of the valve shaft 6, the valve body 5 moves in the upward direction in FIG. 1 together with the valve shaft 6, and the valve body 5 approaches the valve seat 4 and closes. Here, an engaging portion 27 a that engages with the stopper 10 of the spring receiver 9 is formed in the lower portion of the rotor body 27. When the EGR valve 1 is fully closed, the valve body 5 is seated on the valve seat 4 and the magnet rotor 23 is further rotated in the closing direction, so that the stopper 10 is engaged with the engaging portion 27a, and the initial state of the valve shaft 6 is increased. The position is regulated.

  In FIG. 4, the valve shaft 6 is partly cut and shown in a front view. In FIG. 5, the valve shaft 6 is partly cut and shown in a left side view. As shown in FIGS. 2 to 5, the valve shaft 6 includes a shaft body 16 in which a male screw 8 is provided at an upper end portion, and a spring receiver 9 formed separately from the shaft body 16. The spring receiver 9 includes a cylindrical portion 9a that is press-fitted onto the shaft body 16, and a flange portion 9b that is integrally formed at one end of the cylindrical portion 9a. A stopper 10 is integrally formed on one end surface of the flange portion 9b. Is done. In this embodiment, the shaft body 16 and the spring receiver 9 are made of metal (for example, SUS), but the spring receiver 9 is made of a softer material than the shaft body 16. Thereby, the press fit of the spring receiver 9 to the shaft body 16 is facilitated.

  FIG. 6 shows a state in which the shaft body 16 and the spring receiver 9 are separated, and only the spring receiver 9 is cut and shown in a front view. FIG. 7 shows the shaft body 16 by a cross-sectional view taken along line AA of FIG. FIG. 8 shows the shaft body 16 by a cross-sectional view taken along line BB in FIG. FIG. 9 is a plan view showing the spring receiver 9. FIG. 10 shows the spring receiver 9 by a cross-sectional view taken along the line CC of FIG. In FIG. 11, the spring receiver 9 is shown by the DD sectional view of FIG. FIG. 12 is a perspective view of the spring receiver 9. FIG. 13 is a perspective view of the spring receiver 9 cut vertically. As shown in FIGS. 6 to 8, the shaft body 16 includes a male screw 8 formed at the upper end portion thereof, and a large-diameter portion 16 a having the same size as the outer diameter of the male screw 8 adjacent to the base end of the male screw 8. And a round bar portion 16b having a smaller diameter than the large diameter portion 16a extending from the large diameter portion 16a to the lower end side. As shown in FIGS. 6 and 7, the large-diameter portion 16 a has a part of the outer peripheral surface thereof forming a flat surface 16 aa and a transverse section having a substantially D shape. The shaft body 16 can be formed by forging the male screw 8 after the whole is formed by forging.

As shown in FIGS. 6, 12, and 13, the cylindrical portion 9 a constituting the spring receiver 9 has a large-diameter base portion 9 aa having a flange portion 9 b formed at one end, and is separated from the flange portion 9 b by the base portion 9 aa. And a small-diameter sleeve 9ab extending in the direction. As shown in FIGS. 6 and 9 to 13, the spring receiver 9 is formed with a central hole 9 c penetrating in the axial direction. The flange portion 9b is tapered so that the opening portion 9ca of the center hole 9c expands outward. In the base portion 9aa, the central hole 9c has a larger diameter that is larger than the other portion, and the step 9cb
Is formed. As shown in FIGS. 6, 9, 12, and 13, a part of the inner peripheral surface of the large-diameter center hole 9 c of the base portion 9 aa has a flat surface 9 cc, and the cross section has a substantially D shape. . The spring receiver 9 can be formed by pressing or forging.

  Therefore, in order to press-fit the spring receiver 9 into the shaft body 16, the lower end portion of the shaft body 16 is inserted into the center hole 9 c of the spring receiver 9 from the opening 9 ca side of the flange portion 9 b, and the spring receiver 9 is inserted into the shaft body 16. Press fit into. In order to press-fit the large-diameter portion 16a of the shaft body 16 into the large-diameter center hole 9c of the base portion 9aa, the flat surface 16aa of the large-diameter portion 16a is aligned with the flat surface 9cc of the large-diameter center hole 9c. By press-fitting the large diameter portion 16a to the step 9cb of the center hole 9c of the base portion 9aa so that these flat surfaces 16aa and 9cc are aligned with each other, the relative rotation between the spring receiver 9 and the shaft body 16 is restricted, The spring receiver 9 and the shaft body 16 are joined together. In this embodiment, the large-diameter portion 16a in which the cross section of the shaft body 16 forms a D shape corresponds to an example of the engaging portion of the present invention, and the cross section of the base portion 9aa of the spring receiver 9 has a large D shape. The portion of the central hole 9c having a diameter corresponds to an example of the engaged portion of the present invention.

  As shown in FIGS. 1 to 5 and FIG. 11, a two-sided width portion 9 ab having a substantially oval cross section is formed on the outer periphery of the sleeve portion 9 ab of the spring receiver 9. The two-surface width portion 9aba is adapted to be aligned with the rotation restricting portion 11a of the first thrust bearing 11. By aligning the two-surface width portion 9aba and the rotation restricting portion 11a, the stroke motion of the valve shaft 6 is guided by the first and second thrust bearings 11 and 12, and the rotation of the valve shaft 6 is the first. The thrust bearing 11 is regulated.

  According to the EGR valve 1 of this embodiment described above, the valve shaft 6 has a two-body structure from the shaft body 16 provided with the male screw 8 and the spring receiver 9 formed separately from the shaft body 16. Composed. The spring receiver 9 includes a cylindrical portion 9a that is press-fitted onto the shaft body 16, a flange portion 9b that is integrally formed at one end of the cylindrical portion 9a, and a stopper that is integrally formed on one end surface of the flange portion 9b. 10 and the like. Accordingly, since the shaft body 16 and the spring receiver 9 are formed separately, the machining of the respective parts 16 and 9 is facilitated. That is, in the shaft body 16, the upper end portion thereof is not restricted by the stopper 10 of the spring receiver 9, and the processing (rolling) of the male screw 8 is facilitated. Further, in the spring receiver 9, the processing of the stopper 10 on the flange portion 9 b and the processing of the two-surface width portion 9 aba on the sleeve portion 9 ab are facilitated without worrying about the buckling of the shaft body 16. For this reason, the machining of the valve shaft 6 can be facilitated, the unthreaded portion 56a formed on the valve shaft 56 of the conventional example can be omitted, and the length of the male screw 8 can be secured while the valve shaft 6 is secured. 6 can be shortened, and the physique of the EGR valve 1 can be reduced accordingly.

  In this embodiment, since the spring receiver 9 is formed of a softer material than the shaft body 16, the spring receiver 9 can be easily pressed into the shaft body 16. For this reason, manufacture of the valve stem 6 of a two-body structure can be facilitated.

  In addition, this invention is not limited to the said embodiment, A part of structure can also be changed suitably and implemented in the range which does not deviate from the meaning of invention.

  For example, in the above embodiment, the fluid control valve and the valve shaft of the present invention are embodied in the EGR valve 1 and the valve shaft 6 used in the EGR valve 1, but the present invention is not limited to this.

  The present invention can be used as a poppet valve and a fluid control valve such as an EGR valve configured as an electric valve.

1 EGR valve (fluid control valve)
2 Flow path 3 Housing 4 Valve seat 5 Valve body 6 Valve shaft 7 Step motor (electric motor)
8 Male thread 9 Spring receiver 9a Tube portion 9aa Base portion 9ab Sleeve portion 9aba Width across flats (surface width)
9b Flange portion 9c Center hole (engaged portion)
10 Stopper 11 First Thrust Bearing 11a Rotation Restricting Part 16 Shaft 16a Large Diameter Part (engaging part)
23 Magnet rotor 27 Rotor body 31 Female thread 33 Second compression spring

Claims (4)

A housing having a flow path;
A valve seat provided in the flow path;
A valve body provided so as to be seated on the valve seat;
A valve shaft for reciprocating the valve body linearly;
The valve shaft includes one end and the other end, and the valve body is fixed to the one end;
The valve shaft is provided with a male screw at the other end, a spring receiver is provided adjacent to the male screw, and a stopper having a protruding shape is provided on an end surface of the spring receiver facing the male screw, and the spring A surface width portion having a specific cross-sectional shape is formed on the outer periphery of a portion adjacent to the receiver;
The housing is provided with a thrust bearing for supporting the valve shaft so as to be movable in the axial direction, and the inner periphery of the thrust bearing has a specific cross section and can be engaged with the surface width portion. Forming a rotation restricting portion;
A compression spring that is provided between the spring receiver and the housing and biases the valve body and the valve shaft in a direction in which the valve body is seated on the valve seat;
An electric motor for reciprocating the valve shaft in the axial direction;
The electric motor includes a rotor having a female screw threadedly engaged with the male screw, and the valve shaft is rotated via the female screw and the male screw by rotating the rotor by driving the electric motor. In the fluid control valve configured to adjust the opening of the valve body with respect to the valve seat by converting into the reciprocating motion of
The valve shaft is composed of a shaft body in which the male screw is provided at one end, and a spring receiver formed separately from the shaft body,
The spring receiver includes a cylindrical portion that is press-fitted onto the shaft body, a flange portion that is integrally formed at one end of the cylindrical portion, and the stopper that is integrally formed on one end surface of the flange portion. Including
The cylindrical portion includes a large-diameter base portion where the flange portion is formed at one end, and a small-diameter sleeve portion extending in a direction away from the flange portion from the base portion,
In order to restrict relative rotation between the base portion and the shaft body, an engaging portion is provided on one of the base portion and the shaft body, and an engaged portion is provided on the other,
A fluid control valve characterized in that a surface width portion having a specific cross section is formed on the outer periphery of the sleeve portion, and the surface width portion is aligned with the rotation restricting portion of the thrust bearing.   The fluid control valve according to claim 1, wherein the spring receiver is formed of a softer material than the shaft body. A valve shaft used as a poppet valve and a fluid control valve configured as an electric valve,
It is composed of a shaft body in which a male screw is provided at one end, and a spring receiver formed separately from the shaft body,
The spring receiver is integrally formed with a cylindrical portion that is press-fitted onto the shaft body, a flange portion that is integrally formed at one end of the cylindrical portion, and a stopper that forms a protrusion on one end surface of the flange portion. Including
The cylindrical portion includes a large-diameter base portion where the flange portion is formed at one end, and a small-diameter sleeve portion extending in a direction away from the flange portion from the base portion,
In order to restrict relative rotation between the base portion and the shaft body, an engaging portion is provided on one of the base portion and the shaft body, and an engaged portion is provided on the other,
A valve shaft characterized in that a surface width portion having a specific cross section is formed on the outer periphery of the sleeve portion.   The valve shaft according to claim 3, wherein the spring receiver is made of a softer material than the shaft body.

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