JP2020101207A - Valve body, flow rate control valve having the same, and manufacturing method of the valve body - Google Patents

Abstract

To improve the seal performance of a joining part between a main body and a protrusive member, related to a valve body in which the metal-made main body and the protrusive member are joined to each other.SOLUTION: A valve body 14 is constituted by joining a metal-made disc-plate shaped main body 21 and a metal-made circular axial protrusive member 22. A non-penetrative insertion hole 24 inserted with an end part of the protrusive member 22 is formed at the main body 21. An annular engagement groove 25 is formed at an external peripheral face of the protrusive member 22 at the end part which is inserted into the insertion hole 24. An annular recess 26 is formed at an end face of the main body 21 at the outside of the insertion hole 24 in a state that the end part of the protrusive member 22 is inserted into the insertion hole 24 of the main body 21, and a part of an internal peripheral face of the insertion hole 24 is engaged with the annular engagement groove 25 by deformation. A part of an inner face of the insertion hole 24 incompletely fills the annular engagement groove 25, and is engaged with at least the vicinity of an opening edge of the annular engagement groove 25.SELECTED DRAWING: Figure 10

Description

The technique disclosed in this specification relates to a valve body used for a flow rate control valve, a valve body, a flow rate control valve using the valve body, and a method for manufacturing the valve body.

Conventionally, as this type of technique, for example, a metal component and a joining method thereof described in Patent Document 1 below are known. This technique is configured by joining a metal insertion component and a metal insertion component having a through hole through which the insertion component is inserted. A surface groove having a substantially V-shaped cross section is formed on the outer peripheral surface of the insertion component. With the inserted part inserted through the through hole so that the surface groove faces the inner peripheral surface of the through hole, stress is applied to the end surface of the inserted part to plastically deform the part and a part of the meat of the part Engage the surface groove. As a result, a metal component obtained by joining and integrating both components is obtained.

Here, it is conceivable that the valve body that constitutes the flow rate control valve such as the EGR valve is configured by the above metal parts. In particular, the valve body including the plate-shaped main body and the projecting member protruding from the end surface of the main body can be formed of the above-mentioned metal component. In this case, the protruding member corresponds to the insertion component, and the plate-shaped main body corresponds to the insertion component.

Japanese Patent No. 2824408

However, in the technique described in Patent Document 1, since the metal component is configured by inserting and joining the insertion component into the through hole of the insertion component, the sealing property at the joint between the insertion component and the insertion component. Is a problem. For example, when the valve body of the flow control valve is made of this metal component, when the valve body is fully seated on the valve seat and the sealing property of the above-mentioned joint is not reliable, fluid may leak from the joint. Therefore, it cannot function effectively as a valve body.

The disclosed technique has been made in view of the above circumstances, and an object thereof is to provide a valve body formed by joining a main body and a projecting member, each of which is made of metal, with a sealing property at a joint portion between the main body and the projecting member. It is to provide a valve body capable of improving the above, a flow control valve including the same, and a method for manufacturing the valve body.

In order to achieve the above object, the technique according to claim 1 is a valve body configured by joining a plate-shaped main body made of metal and a shaft-shaped projection member made of metal, Has a non-penetrating insertion hole for inserting the end of the protruding member, and an engaging groove is formed on the outer surface of the end of the protruding member to be inserted into the insertion hole. With the part inserted in the insertion hole of the main body, a recess is formed on the end surface of the main body outside the insertion hole, and a part of the inner surface of the insertion hole is engaged with the engagement groove by deformation. To do.

According to the configuration of the above technology, when the protruding member is inserted into the non-penetrating insertion hole of the main body, part of the inner surface of the insertion hole is deformed to engage with the engaging groove, thereby joining the protruding member to the main body. To be done. Therefore, in the state where the projecting member is joined to the main body, there is no through hole between the main body and the projecting member that allows passage of the fluid.

In order to achieve the above-mentioned object, the technique according to claim 2 is the technique according to claim 1, in which a part of the inner surface of the insertion hole partially fills the engagement groove, and at least the opening of the engagement groove. The purpose is to engage near the edge.

According to the configuration of the above technique, in addition to the action of the technique according to claim 1, the engagement of the inner surface of the insertion hole with the engagement groove is such that at least a part of the inner surface incompletely fills the engagement groove. It is to engage in the vicinity of the opening edge of the mating groove. Therefore, the deformation of the inner surface of the insertion hole and the engagement with the engagement groove are relatively small, so that the protrusion member is prevented from coming off from the insertion hole.

In order to achieve the above-mentioned object, the technology according to claim 3 is the technology according to claim 2, wherein the engagement groove has an upper opening edge near the opening end of the insertion hole and a lower opening near the bottom of the insertion hole. Including the opening edge, and assuming that the distance from the opening end of the insertion hole to the bottom is the hole depth of the insertion hole, the lower opening edge is arranged at a position within half the hole depth from the opening end. ..

According to the configuration of the above technique, in addition to the action of the technique according to claim 2, since the lower opening edge of the engaging groove is arranged at a position within half the hole depth from the opening end, the lower opening edge is It is relatively close to the open end. Therefore, the contact length between the deformed body and the lower opening edge when the end surface of the main body is pressed and deformed outside the insertion hole and a part of the inner surface of the insertion hole is engaged with the engagement groove, growing.

In order to achieve the above object, the technology according to claim 4 is the technology according to any one of claims 1 to 3, wherein the volume of the recess is set to 150% or more of the volume of the engaging groove. The purpose is.

According to the configuration of the above technique, in addition to the action of the technique according to any one of claims 1 to 3, since the volume ratio of the engagement groove to the recess is set to 150% or more, the inner surface of the insertion hole is deformed. The necessary and sufficient strength can be obtained for the engagement with the engagement groove.

In order to achieve the above-mentioned object, the technology according to claim 5 is a flow control valve including the valve body according to any one of claims 1 to 4, wherein a flow path for a fluid and a flow path are provided. The purpose of the present invention is to provide a valve seat to be arranged and a valve body so that the valve body can be seated on the valve seat in the flow path.

According to the configuration of the above technique, in the fully closed state where the valve body is seated on the valve seat, even if fluid acts on the valve body, the fluid does not leak from between the main body and the protruding member.

In order to achieve the above object, the technology according to claim 6 is the method for manufacturing a valve body according to any one of claims 1 to 4, wherein an end portion of the protruding member is inserted into an insertion hole of the main body. In this state, a recess is formed by pressing the main body with a punch on the end surface of the main body outside the insertion hole, and the main body is deformed as the recess is formed, so that part of the inner surface of the insertion hole becomes an engagement groove. The purpose is to engage them.

According to the configuration of the above technique, with the end portion of the protruding member inserted in the insertion hole of the main body, the protruding member is engaged with the main body only by pressing the end surface of the main body with the punch, and the both are effectively joined. It

According to the technique described in claim 1, with respect to the valve body formed by joining the main body and the projecting member, each of which is made of metal, it is possible to improve the sealing property at the joint portion between the main body and the projecting member.

According to the technique described in claim 2, in addition to the effect of the technique described in claim 1, the deformation of the main body for deforming a part of the inner surface of the insertion hole can be suppressed to be small, and the durability of the main body can be improved. Can be kept.

According to the technique described in claim 3, in addition to the effect of the technique described in claim 2, the contact length between the deformed main body and the lower opening edge of the engagement groove increases, so that the protruding member with respect to the pull-out direction is removed. The holding power can be increased.

According to the technique described in claim 4, in addition to the effect of the technique described in any one of claims 1 to 3, it is possible to firmly fix the main body and the protruding member to form the valve body.

According to the technique of claim 5, the valve body can be advantageously used for the flow control valve.

According to the technique described in claim 6, it is possible to relatively easily obtain the valve body having improved sealability at the joint portion between the main body and the protruding member.

3 is a perspective view showing a flow control valve according to the embodiment. FIG. FIG. 3 is a perspective view showing a pipe part in a fully closed state with a part thereof broken away according to the embodiment. FIG. 3 is a perspective view showing a partially broken tube portion in a fully opened state according to the embodiment. The front view which concerns on one Embodiment and shows a valve body. The top view which concerns on one Embodiment and shows a valve body. FIG. 3 is a front view showing the main body according to the embodiment. The front view which concerns on one Embodiment and shows a protrusion member. FIG. 8 is an enlarged view showing a part surrounded by a chain line circle in FIG. 7 according to the embodiment. FIG. 10 is a cross-sectional view showing a part of the manufacturing process according to the embodiment. FIG. 10 is a cross-sectional view showing a part of the manufacturing process according to the embodiment. FIG. 10 is a cross-sectional view showing a part of the manufacturing process according to the embodiment. FIG. 10 is a cross-sectional view showing a part of the manufacturing process according to the embodiment. FIG. 4 is a cross-sectional view showing a punch according to the embodiment. FIG. 14 is an enlarged cross-sectional view showing a part of a chain line circle of FIG. 13 according to the embodiment. FIG. 10 is a cross-sectional view showing a part of a process of deforming the main body and engaging the inner peripheral surface of the insertion hole with the annular engagement groove according to the embodiment. FIG. 10 is a cross-sectional view showing a part of a process of deforming the main body and engaging the inner peripheral surface of the insertion hole with the annular engagement groove according to the embodiment. FIG. 10 is a cross-sectional view showing a part of a process of deforming the main body and engaging the inner peripheral surface of the insertion hole with the annular engagement groove according to the embodiment. 9 is a graph showing the relationship between the volume ratio and the breaking strength of the engagement portion between the annular engagement groove and the inner peripheral surface of the insertion hole according to the embodiment.

An embodiment embodying a valve body, a flow control valve including the valve body, and a method for manufacturing the valve body will be described in detail below with reference to the drawings.

[Outline of flow control valve]
An outline of the electric flow control valve 1 including the double eccentric valve will be described. FIG. 1 is a perspective view showing the flow control valve 1. The flow rate control valve 1 includes a valve unit 2 including a double eccentric valve, a motor unit 3 including a motor (not shown), and a reduction mechanism unit 4 including a reduction mechanism (not shown) including a plurality of gears. With. The valve portion 2 includes a pipe portion 12 having a flow passage 11 through which gas flows, and a valve seat 13, a valve body 14 and a rotary shaft 15 are arranged in the flow passage 11. The rotational force of the motor is transmitted to the rotary shaft 15 via a speed reduction mechanism. In this embodiment, detailed description of the double eccentric valve is omitted. The flow control valve 1 can be applied to, for example, an EGR valve provided in the EGR passage of the engine.

FIG. 2 is a partially cutaway perspective view of the pipe portion 12 in a fully closed state in which the valve body 14 is seated on the valve seat 13. FIG. 3 is a partially cutaway perspective view of the pipe portion 12 in a fully opened state in which the valve body 14 is farthest from the valve seat 13. As shown in FIGS. 2 and 3, a step portion 11a is formed in the flow path 11, and the valve seat 13 is attached to the step portion 11a. The valve seat 13 has an annular shape and has a valve hole 16 in the center. An annular seat surface 17 is formed at the edge of the valve hole 16. The valve element 14 has a disc shape, and an annular seal surface 18 corresponding to the seat surface 17 is formed on the outer circumference of the valve element 14. The valve body 14 is fixed to a pin portion 15a formed at the tip of the rotary shaft 15 by welding, and rotates integrally with the rotary shaft 15. 2 and 3, the flow path 11 above the valve seat 13 shows the upstream side of the flow of gas (EGR gas etc.), and the flow path 11 below the valve seat 13 shows the downstream side of the gas flow. The valve body 14 is arranged in the flow passage 11 on the upstream side of the valve seat 13.

Therefore, as shown in FIG. 2, from the fully closed state of the valve body 14, the motor is operated (normally rotated) by energization, and its rotation is transmitted to the rotary shaft 15 via the speed reduction mechanism, whereby the rotary shaft 15 is rotated. And the valve body 14 is rotated and the flow path 11 is opened. That is, the valve body 14 is opened. The valve body 14 can be opened to the fully opened state shown in FIG. On the other hand, from the fully open state shown in FIG. 3, the motor operates (reverse rotation), and its rotation is transmitted to the rotary shaft 15 via the reduction mechanism, whereby the rotary shaft 15 and the valve body 14 are rotated, and the flow path is changed. 11 is closed. That is, the valve body 14 is closed. The valve body 14 can be closed to the fully closed state shown in FIG.

[Valve structure]
FIG. 4 shows the valve body 14 in a front view. FIG. 5 shows the valve body 14 in a plan view. The valve body 14 is configured by joining a disk-shaped main body 21 made of metal and a circular shaft-shaped protruding member 22 made of metal. FIG. 6 shows the main body 21 in a front view. FIG. 7 shows the projecting member 22 in a front view. The projecting member 22 is arranged at the center of the upper surface of the main body 21 and projects upward. The projecting member 22 is formed with a pin hole 23 into which the pin portion 15a of the rotating shaft 15 is fixed. The pin hole 23 is formed so as to penetrate the protruding member 22. The axis L1 of the pin hole 23 extends parallel to the radial direction of the valve body 14 and is eccentrically arranged in the radial direction of the valve body 14 from the axis L2 of the valve body 14. A non-penetrating insertion hole 24 for inserting the lower end portion of the protruding member 22 is formed on the upper surface of the main body 21. An annular engaging groove 25 having a substantially V-shaped cross section is formed on the outer peripheral surface of the lower end portion of the projecting member 22 which is inserted into the insertion hole 24. The annular engagement groove 25 is an engagement groove formed in an annular shape on the outer peripheral surface of the protruding member 22. An annular recess 26 is formed on the upper end surface of the main body 21 outside the insertion hole 24 in a state where the end portion of the projecting member 22 is inserted into the insertion hole 24 of the main body 21. The part is engaged with the annular engaging groove 25 by the deformation. The annular recess 26 is an annular recess formed outside the insertion hole 24. Thereby, the main body 21 and the protruding member 22 are joined together to form the valve body 14. In this embodiment, a part of the inner surface of the insertion hole 24 partially fills the annular engagement groove 25 and engages at least in the vicinity of the upper and lower opening edges 25d and 25e (see FIG. 8) of the annular engagement groove 25. It is supposed to do. The annular engagement groove 25 includes an upper opening edge 25d near the opening end 24a of the insertion hole 24 and a lower opening edge 25e near the bottom 24b of the insertion hole 24 (see FIG. 15). Assuming that the distance from the opening end 24a of the insertion hole 24 to the bottom 24b is the hole depth J1 of the insertion hole 24, the lower opening edge 25e is arranged at a position within half the hole depth J1 from the opening end 24a (Fig. 15). Further, in this embodiment, the volume of the annular recess 26 is set to 150% or more of the volume of the annular engagement groove 25. That is, the volume ratio of the annular engagement groove 25 to the annular recess 26 is set to 150% or more, which is sufficiently large.

FIG. 8 is an enlarged view showing a portion surrounded by a chain line circle S1 in FIG. The annular engagement groove 25 has an upper upper slope 25a, a lower lower slope 25b, and a strip-shaped bottom 25c between the slopes 25a and 25b in the axial direction of the projecting member 22 (vertical direction in FIG. 8). including. A slope 27 is formed on the outer periphery of the lower end of the projecting member 22. In this embodiment, as shown in FIG. 8, when the distance D1 from the upper opening edge 25d of the annular engaging groove 25 to the lower end of the protruding member 22 is set to, for example, "1.35 mm", the width of the annular engaging groove 25. W1 can be set to, for example, "0.04 mm". Further, the depth T1 of the annular engagement groove 25 can be set to, for example, “0.15 mm”, and the angle θ1 formed by the upper slope 25a and the lower slope 25b can be set to, for example, “100°”.

[About manufacturing method of valve body]
In this embodiment, in order to manufacture the valve element 14, first, with the lower end portion of the projecting member 22 inserted in the insertion hole 24 of the main body 21, the upper surface (end surface) of the main body 21 is placed outside the insertion hole 24. By pressing the main body 21 with the punch 31, the annular recess 26 is formed, and the main body 21 is deformed as the annular recess 26 is formed, so that a part of the inner surface of the insertion hole 24 is engaged with the annular engagement groove 25. Let As a result, the main body 21 and the protruding member 22 are joined together.

That is, FIG. 9 to FIG. 12 show the series of manufacturing steps by sectional views. First, in the “projection member insertion step”, as shown in FIGS. 9 and 10, the lower end portion of the projection member 22 is inserted into the insertion hole 24 of the main body 21. In this state, the annular engagement groove 25 of the protruding member 22 is arranged so as to face the inner peripheral surface of the insertion hole 24 of the main body 21.

Next, in the “body pressing step”, as shown in FIGS. 11 and 12, with the protruding member 22 inserted in the insertion hole 24, on the upper surface (end surface) of the body 21 outside the insertion hole 24, By pressing the main body 21 with the punch 31, the annular recess 26 is formed, and the main body 21 is deformed in accordance with the formation of the annular recess 26 so that a part of the inner surface of the insertion hole 24 is engaged with the annular engagement groove 25. .. Thereby, the valve body 14 is obtained by joining the main body 21 and the protruding member 22.

FIG. 13 is a sectional view showing the punch 31. FIG. 14 shows an enlarged cross-sectional view of a portion indicated by a chain line circle S2 in FIG. As shown in FIG. 13, the punch 31 has a circular tubular shape including a hollow 32 that receives the protruding member 22. An annular ridge 33 is formed at the lower end of the punch 31 and at the opening edge of the hollow 32. As shown in FIG. 14, the annular protrusion 33 has a substantially mountain-shaped cross section, and includes an inner inner slope 33a, an outer outer slope 33b, and a plane 33c between the slopes 33a and 33b. In this embodiment, the height H1 of the annular ridge 33 shown in FIG. 14 can be set to, for example, “0.4 mm”. Further, for example, the angle θ2 of the inner slope 33a can be set larger than the angle θ3 of the outer slope 33b.

Here, the annular concave portion 26 is formed on the upper surface of the main body 21, and a part of the inner surface of the insertion hole 24 of the main body 21 is engaged with the annular engaging groove 25 because the annular convex strip 33 of the punch 31 is the main body. This is because the main body 21 is deformed by cutting into the upper surface of 21.

15 to 17 are sectional views showing the deformation of the main body 21 and the process in which the inner peripheral surface of the insertion hole 24 is engaged with the annular engagement groove 25. First, as shown in FIG. 15, the annular protrusion 33 of the punch 31 contacts the upper surface (end surface) of the main body 21. After that, as shown in FIG. 16, when the annular ridge 33 moves downward and the annular ridge 33 begins to bite into the upper surface (end face) of the main body 21, the annular recess 26 begins to be formed, and the peripheral edge portion of the opening of the insertion hole 24 is formed. Start to bulge toward the protruding member 22. In FIG. 16, the portion indicated by gauze indicates the stress generating portion F1. The stress generating portion F1 is located particularly near the upper opening edge 25d and the lower opening edge 25e of the annular engaging groove 25. After that, as shown in FIG. 17, when the annular ridge 33 moves further downward and the annular ridge 33 further bites into the main body 21, a part of the inner peripheral surface of the insertion hole 24 further moves toward the protruding member 22 side. The bulge, and the bulge portion 21 a engages with the annular engagement groove 25. Here, as shown in FIG. 17, a part of the bulge portion 21a engages with the upper and lower opening edges 25d and 25e of the annular engaging groove 25 to become the stress generating portion F1, and the stress generating portion F1 is used to form the main body. A strong joining force between 21 and the projecting member 22 can be obtained.

[Operation and effect of valve body and flow control valve]
According to the configuration of the valve body 14 of the present embodiment described above, the inner peripheral surface of the insertion hole 24 is deformed by the annular engagement groove when the protruding member 22 is inserted into the non-penetrating insertion hole 24 of the main body 21. By engaging 25, the projecting member 22 is joined to the main body 21. Therefore, in the state where the projecting member 22 is joined to the main body 21, there is no through hole between the main body 21 and the projecting member 22 that allows passage of the fluid. Therefore, with respect to the valve body 14 formed by joining the main body 21 and the protruding member 22 each made of metal, it is possible to improve the sealing property at the joint portion between the main body 21 and the protruding member 22.

According to the configuration of the valve body 14 of this embodiment, the engagement of the inner surface of the insertion hole 24 with the annular engagement groove 25 is such that a part of the inner surface thereof fills the annular engagement groove 25 incompletely. This is to engage at least in the vicinity of the opening edges 25d and 25e (see FIG. 8) of the annular engagement groove 25. Therefore, the deformation of the inner peripheral surface of the insertion hole 24 and the engagement with the annular engagement groove 25 can be made relatively small, so that the protruding member 22 can be prevented from coming off from the insertion hole 24. For this reason, the deformation of the main body 21 for deforming a part of the inner peripheral surface of the insertion hole 24 can be suppressed to be small, and the durability of the main body 21 can be maintained.

According to the configuration of the valve body 14 of this embodiment, the lower opening edge 25e of the annular engagement groove 25 is arranged at a position within half the hole depth J1 from the opening end 24a of the insertion hole 24, so that the lower opening is formed. The edge 25e is relatively close to the open end 24a. Therefore, when the end surface of the main body 21 is pressed and deformed on the outside of the insertion hole 24 and a part of the inner surface of the insertion hole 24 is engaged with the annular engagement groove 25, the deformed main body 21 and the lower opening edge are The contact length with 25e becomes large. For this reason, the contact length between the deformed main body 21 and the lower opening edge 25e of the annular engagement groove 25 becomes large, so that the holding force of the protruding member 22 in the pulling direction can be increased.

According to the configuration of the valve body 14 of this embodiment, the ratio (volume ratio) of the volume of the annular engagement groove 25 of the projecting member 22 to the volume of the annular recess 26 of the main body 21 is set to 150% or more. The necessary and sufficient strength can be obtained for the engagement with the annular engagement groove 25 due to the deformation of the inner peripheral surface of the hole 24. FIG. 18 is a graph showing the relationship between this volume ratio and the breaking strength of the engagement portion between the annular engagement groove 25 and the inner peripheral surface of the insertion hole 24. In this graph, the thick line shows the breaking strength (about 140%) required for the engaging portion, and the broken line shows the change in breaking strength of the conventional example. As can be seen from this graph, in the present embodiment, since the volume ratio is set to "150% or more", it can be seen that the engaging portion satisfies the necessary and sufficient discard strength. Therefore, the main body 21 and the protruding member 22 can be firmly fixed to form the valve body 14.

According to the configuration of the flow control valve 1 of this embodiment, even when a fluid such as EGR gas acts on the valve body 14 in the fully closed state where the valve body 14 is seated on the valve seat 13, the main body 21 and the protruding member thereof. No fluid leaks from between 22. In addition, the valve element 14 has the above-described actions and effects. Therefore, the valve body 14 can be advantageously used for the flow control valve 1.

[Operations and effects of valve body manufacturing method]
According to the method for manufacturing the valve body 14 of this embodiment, the protruding member 22 can be formed by simply pressing the end surface of the main body 21 with the punch 31 while the end portion of the protruding member 22 is inserted into the insertion hole 24 of the main body 21. The main body 21 is engaged and the two are effectively joined. Therefore, the valve body 14 having improved sealability at the joint between the main body 21 and the protruding member 22 can be obtained relatively easily.

The disclosed technique is not limited to the above-described embodiment, and a part of the configuration may be appropriately modified and implemented without departing from the gist of the disclosed technique.

(1) In the above embodiment, the flow control valve 1 including the valve body 14 is applied to the EGR valve, but it may be applied to a valve other than the EGR valve.

(2) In the above embodiment, the engagement groove formed on the outer surface of the protruding member 22 is embodied as the annular engagement groove 25 having an annular shape. On the other hand, the engagement groove formed on the outer surface of the protruding member 22 can be embodied as a plurality of engagement grooves formed by dividing the annular engagement groove 25 into a plurality of sections.

(3) In the above embodiment, the recess formed outside the insertion hole 24 is embodied as the annular recess 26 having an annular shape. On the other hand, the recess formed outside the insertion hole 24 can be embodied as a plurality of recesses formed by dividing the annular recess 26 into a plurality of parts.

The disclosed technique can be applied to the manufacture of a flow control valve such as an EGR valve and its valve body.

DESCRIPTION OF SYMBOLS 1 Flow control valve 11 Flow path 13 Valve seat 14 Valve body 21 Main body 21a Swelling portion 22 Projection member 24 Insertion hole 25 Annular engagement groove (engagement groove)
25d Upper opening edge 25e Lower opening edge 26 Annular recess (recess)
31 punch 33 annular ridge

Claims (6)

A valve body constituted by joining a plate-shaped main body made of metal and a shaft-shaped projection member made of metal,
In the main body, a non-penetrating insertion hole for inserting the end portion of the protruding member is formed,
An engagement groove is formed on an outer surface of the end portion of the projecting member that is inserted into the insertion hole,
With the end portion of the projecting member inserted in the insertion hole of the main body, a concave portion is formed on the end surface of the main body outside the insertion hole, and a part of the inner surface of the insertion hole is deformed. A valve body that engages with the engagement groove. The valve body according to claim 1,
A valve element, wherein a part of an inner surface of the insertion hole fills the engagement groove incompletely and engages at least in the vicinity of an opening edge of the engagement groove. The valve body according to claim 2,
The engagement groove includes an upper opening edge near the opening end of the insertion hole and a lower opening edge near the bottom of the insertion hole,
When the distance from the opening end of the insertion hole to the bottom is the hole depth of the insertion hole, the lower opening edge is arranged at a position within half of the hole depth from the opening end, Valve body to do. The valve body according to any one of claims 1 to 3,
The valve body, wherein the volume of the recess is set to 150% or more of the volume of the engaging groove. A flow control valve comprising the valve element according to claim 1.
A flow path through which the fluid flows,
A valve seat arranged in the flow path,
A flow control valve, wherein the valve body is provided so as to be seated on the valve seat in the flow path. It is a manufacturing method of the valve body in any one of Claims 1 thru|or 4, Comprising:
With the end portion of the projecting member inserted in the insertion hole of the main body, the concave portion is formed by pressing the main body with a punch on the end surface of the main body outside the insertion hole, A method for manufacturing a valve body, characterized in that the main body is deformed in accordance with the formation of the recess so that a part of the inner surface of the insertion hole is engaged with the engagement groove.

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