WO2024013776A1

WO2024013776A1 - Exhaust gas recirculation valve and manufacturing method therefor

Info

Publication number: WO2024013776A1
Application number: PCT/JP2022/027176
Authority: WO
Inventors: 克哉鈴木; 徹田中; 拓朗頭井
Original assignee: 三菱電機株式会社
Priority date: 2022-07-11
Filing date: 2022-07-11
Publication date: 2024-01-18
Also published as: JPWO2024013776A1

Abstract

This exhaust gas recirculation valve (100) is a double poppet exhaust gas recirculation valve comprising: a housing (10) having a first passage, a second passage, and a third passage which communicate with space where a valve shaft is disposed, are formed staggered along the axial direction of the valve shaft, and are formed in directions perpendicular to the axis of the valve shaft; a first insert component (20) having an annular part (21) which is molded integrally with the housing between the first passage and the second passage; and a second insert component (30) having a barrel part (34), which has a lower base part (31) that is an annular part molded integrally with the housing between the second passage and the third passage and an opening (36) that communicates with the third passage formed therein, and a projecting tube part (33), which projects from an upper base part (35) of the barrel part.

Description

Exhaust gas recirculation valve and its manufacturing method

The disclosed technology relates to an exhaust gas recirculation valve.

Some exhaust gas recirculation valves use a double poppet type valve.
Double-poppet exhaust gas recirculation valves, for example as in US Pat. The built-in parts, the first valve seat, the second valve seat, etc. are press-fitted and manufactured.
When manufacturing a double poppet type exhaust gas recirculation valve, it is necessary to design an appropriate press-fit allowance, perform machining to finish the dimensions of the press-fit part with high accuracy, and manage the press-fit to ensure that it is press-fitted with an appropriate press force. This requires a lot of effort.

Japanese Patent Application Publication No. 2007-303434

As mentioned above, the conventional double poppet type exhaust gas recirculation valve has the problem that it takes a lot of effort to manufacture it with good quality and cannot be manufactured easily.

The present disclosure solves the above problems and aims to facilitate the manufacture of a double poppet type exhaust gas recirculation valve.

The exhaust gas recirculation valve of the present disclosure is a double poppet type exhaust gas recirculation valve, which communicates with a space in which a valve shaft is arranged, and is formed alternately along the axial direction of the valve shaft, and , a housing having a first passage, a second passage, and a third passage formed in a direction perpendicular to the axis of the valve shaft, and integrally formed in the housing between the first passage and the second passage. a first insert component having a molded annular portion; a lower bottom portion that is an annular portion integrally molded in the housing between the second passageway and the third passageway; The second insert component includes a cylindrical portion in which an opening communicating with the three passages is formed, and a protruding cylindrical portion protruding from the upper bottom portion of the cylindrical portion.

According to the present disclosure, it is possible to easily manufacture a double poppet type exhaust gas recirculation valve.

FIG. 1 is a cross-sectional view of a part of the configuration of an exhaust gas recirculation valve according to the present disclosure. FIG. 2 is a diagram illustrating an example of a first insert part used in an exhaust gas recirculation valve according to the present disclosure. FIG. 3 is a diagram illustrating an example of a second insert part for use in an exhaust gas recirculation valve according to the present disclosure. FIG. 4 is a diagram illustrating the first step in the method for manufacturing an exhaust gas recirculation valve according to the present disclosure. FIG. 5 is a diagram illustrating the second step in the method for manufacturing an exhaust gas recirculation valve according to the present disclosure. FIG. 6 is a diagram illustrating the third step in the method for manufacturing an exhaust gas recirculation valve according to the present disclosure. FIG. 7 is a diagram illustrating the fourth step in the method for manufacturing an exhaust gas recirculation valve according to the present disclosure. FIG. 8 is a diagram illustrating the fifth step in the method for manufacturing an exhaust gas recirculation valve according to the present disclosure. FIG. 9 is a diagram illustrating the sixth step in the method for manufacturing an exhaust gas recirculation valve according to the present disclosure. FIG. 10 is a diagram illustrating the seventh step in the method for manufacturing an exhaust gas recirculation valve according to the present disclosure. FIG. 11 is a diagram illustrating the eighth step in the method for manufacturing an exhaust gas recirculation valve according to the present disclosure.

Hereinafter, in order to explain the present disclosure in more detail, embodiments of the present disclosure will be described with reference to the accompanying drawings.

Embodiment 1.
FIG. 1 is a cross-sectional view showing a part of the configuration of an exhaust gas recirculation valve 100 according to the present disclosure.
FIG. 2 is a diagram illustrating an example of a first insert component 20 used in the exhaust gas recirculation valve 100 according to the present disclosure.
FIG. 3 is a diagram illustrating an example of a second insert component 30 used in the exhaust gas recirculation valve 100 according to the present disclosure.
The exhaust gas recirculation valve 100 described in the first embodiment is a double poppet type exhaust gas recirculation valve.
The exhaust gas recirculation valve 100 shown in FIG. 1 includes a housing 10, a first insert part 20, and a second insert part 30.

Housing 10 is a valve housing that holds and stores the valve components.
The housing 10 is cast and molded by a die casting method in which molten metal (molten metal) is poured into a mold 200 and molded. The molten metal used for the housing 10 is, for example, aluminum (aluminum die casting).
Moreover, the housing 10 is configured such that the first insert component 20 and the second insert component 30 are insert-molded and integrated with the first insert component 20 and the second insert component 30. Details of the first insert component 20 and the second insert component 30 will be described later.

The housing 10 has a first opening 11 , a second opening 12 , a third opening 13 , a fourth opening 14 , and a fifth opening 15 .
The first opening 11 shown in FIG. 1 forms a first passage in the exhaust gas recirculation valve 100. The first passage in the exhaust gas recirculation valve 100 of FIG. 1 is the first outlet passage for exhaust gas.
The second opening 12 shown in FIG. 1 forms a second passageway in the exhaust gas recirculation valve 100. The second passage in the exhaust gas recirculation valve 100 of FIG. 1 is the exhaust gas inlet passage.
The third opening 13 shown in FIG. 1 forms the third passageway in the exhaust gas recirculation valve 100. The third passage in the exhaust gas recirculation valve 100 of FIG. 1 is the second outlet passage for exhaust gas.
That is, the housing 10 has a first passage, a second passage, and a third passage in the exhaust gas recirculation valve 100.
The housing 10 has a space that communicates from the fourth opening 14 to the fifth opening 15 shown in FIG. This space is a space in which the valve shaft 40 of the exhaust gas recirculation valve 100 is arranged.
The first passage, the second passage, and the third passage each communicate with a space in which the valve shaft 40 is arranged.
The first passage, the second passage, and the third passage are formed alternately along the axial direction of the valve shaft 40 when the valve shaft 40 is disposed in the housing 10, and It is formed in a direction perpendicular to the axis.
In FIG. 1, the first passage, the second passage, and the third passage are arranged in this order from the bottom to the top.

When the valve shaft 40 is assembled into the housing 10 as the exhaust gas recirculation valve 100, the valve shaft 40 has a first valve disc 42 and a second valve disc 43 at different positions along the axis of the valve shaft 40. It is installed. Further, in this state, the valve shaft 40 is supported such that a driving means is attached to, for example, one end thereof, and is moved in the axial direction by the driving means.

The housing 10 stores a spring 50 in the fourth opening 14 shown in FIG.
The spring 50 is a biasing means that biases the valve shaft 40 upward in the drawing.

That is, the housing 10 shown in FIG. 1 includes the first insert part 20, the second insert part 30, the valve shaft 40, the first valve disc 42, and the second valve component in a state where the valve components are assembled. A housing of the exhaust gas recirculation valve for holding or storing the disc 43 and the spring 50.

The housing 10 covers and holds the first insert component 20 between the first passage and the second passage.
The first insert component 20 will be explained.
The first insert component 20 is a plate-shaped component (circular plate-shaped component) having an annular shape. The first insert component 20 is a component formed into an annular shape using, for example, a stainless steel plate. When the first insert part 20 is made of stainless steel, the first insert part 20 is formed by stainless steel casting, press working, or the like.
The first insert part 20 is integrally molded between the first opening 11 (first passage) and the second opening 12 (second passage) in the housing 10.

The first insert component 20 shown in FIG. 2 is molded to have an annular portion 21, an opening 22, and a comb tooth portion 23.
The annular portion 21 is a plate-shaped portion forming an annular ring.
The opening 22 is a hole opened in the center of the annular portion 21 . The diameter of the opening 22 is larger than the diameter of the valve shaft 40 and smaller than the diameter of the first valve disc 42.
When the valve shaft 40 is attached to the housing 10, the valve shaft 40 passes through the opening 22. The inner circumferential edge of the annular portion 21 comes into contact with or separates from the first valve disc 42 attached to the valve shaft 40, depending on the movement of the valve shaft 40 in the axial direction. With such a configuration, the first insert component 20 functions as a first valve seat.
The comb tooth portion 23 is formed by cutting out a comb tooth shape along the outer periphery of the first insert component 20 . Since the comb tooth portion 23 is molded integrally with the housing 10, the first insert component 20 can be positioned and fixed with respect to the housing 10, and the positional shift of the first insert component 20 can be prevented. Can be suppressed. The comb tooth portion 23 shown in FIG. 2 is formed such that the outer periphery of the first insert component 20 is bent in a direction perpendicular to the annular plate portion.

The housing 10 integrally holds and covers the second insert part 30.
The second insert component 30 will be explained.
The second insert component 30 is a component shaped like two tubes connected with each other having different diameters. The second insert component 30 is made of, for example, a stainless steel plate. When the second insert component 30 is made of stainless steel, the second insert component 30 is molded by stainless steel casting, press working, or the like.
The second insert component 30 shown in FIG. 3 is molded to have a cylindrical portion 34 and a protruding cylindrical portion 33.

In the second insert component 30, the cylindrical portion 34 is a cylindrical portion having a diameter larger than that of the protruding cylindrical portion 33, and is formed to have an upper base portion 35 and a lower base portion 31. Further, the cylindrical portion 34 is formed to have an opening 36 between the upper base 35 and the lower base 31.
In the state after the second insert component 30 is insert-molded into the housing 10, the opening 36 communicates with the third opening 13 (third passage) in the housing 10.

The lower bottom portion 31 of the cylindrical portion 34 of the second insert component 30 is a plate-shaped portion (annular portion) forming an annular ring.
In the state after the second insert part 30 is insert-molded into the housing 10, the lower bottom part 31 is formed by forming a second opening 12 (second passage) and a third opening 13 (third passage) in the housing 10. It is integrally molded and held between the
The opening 32 is a hole opened in the center of the lower base 31. The diameter of the opening 32 is larger than the diameter of the valve shaft 40 and smaller than the diameter of the second valve disc 43.
When the valve shaft 40 is attached to the housing 10, the valve shaft 40 passes through the opening 32. The inner circumferential edge of the lower bottom portion 31 comes into contact with or separates from the second valve disc 43 attached to the valve shaft 40, depending on the movement of the valve shaft 40 in the axial direction. With such a configuration, the lower bottom portion 31 of the second insert component 30 functions as a second valve seat.
The lower base 31 has an opening side low wall 37 extending in a direction perpendicular to the lower base 31 on the opening 36 side. Deformation of the lower bottom portion 31 can be suppressed by the opening side low wall portion 37.

The upper bottom portion 35 of the cylindrical portion 34 of the second insert component 30 is a portion of the cylindrical portion 34 that faces the lower bottom portion 31, and has the same diameter (including approximately the same diameter) as the diameter of the lower bottom portion 31. It is annular and plate-shaped.
Although not shown, the upper base 35 has a hole opened in the inner circle of the ring in the upper base 35. A peripheral portion of the upper bottom portion 35 that is in contact with the inner circular portion is connected to the protruding cylindrical portion 33 .
The upper bottom portion 35 is integrally formed between the third opening 13 (third passage) and the fourth opening 14 in the housing 10 in a state after the second insert component 30 is insert-molded into the housing 10. It is molded and held.
A hole 38 is formed in the upper bottom portion 35 of the cylindrical portion 34 of the second insert component 30 shown in FIG. This improves the flow of the molten metal during insert molding. Furthermore, since the hole 38 is filled with metal after insert molding, it is possible to suppress misalignment of the second insert component 30.

Although not shown, the lower bottom portion 31 of the cylindrical portion 34 of the second insert component 30 may have a hole similar to the hole 38 of the upper bottom portion 35. This improves the flow of the molten metal during insert molding, similarly to the upper bottom portion 35. Further, like the upper base part 35, the hole is filled with metal after insert molding, so that misalignment of the second insert component 30 can be further suppressed.

In the second insert component 30 , the protruding cylindrical portion 33 is a cylindrical portion having a smaller diameter than the diameter of the cylindrical portion 34 .
The protruding cylindrical portion 33 is formed to protrude from the upper bottom portion 35 of the cylindrical portion 34 . Specifically, the protruding cylindrical portion 33 is formed to protrude from the peripheral edge of the upper base 35 of the cylindrical portion 34 that is in contact with the inner circular portion.
The protruding cylindrical portion 33 has an opening 33 a on the side opposite to the upper bottom portion 35 of the cylindrical portion 34 . A slide mold is set in the opening 33a during insert molding, and the valve shaft 40 is passed through the opening 33a when the valve shaft 40 is assembled into the housing 10.
The protruding cylinder part 33 in the second insert part 30 has an inner diameter smaller than the inner diameter of the lower bottom part 31 of the cylinder part 34, and allows the valve shaft 40 to move in the axial direction when the valve shaft 40 is assembled to the housing 10. support. With such a configuration, the protruding cylindrical portion 33 of the second insert component 30 functions as a bearing for the valve shaft 40.

A method of manufacturing the exhaust gas recirculation valve 100 according to the present disclosure will be described below.
FIG. 4 is a diagram illustrating the first step in the method for manufacturing the exhaust gas recirculation valve 100 according to the present disclosure.
The first step shown in FIG. 4 is a step of setting the second slide die 220 on the protruding cylindrical portion 33 of the second insert component 30. As shown in FIG.
Specifically, first, the protrusion of the second slide mold 220 is inserted into the protrusion cylinder part 33 of the second insert part 30, and the second insert part 30 is held in the second slide mold 220. Make it. Next, the second slide mold 220 is inserted in the direction of arrow A shown in FIG. 4 from the opening of the mold 200 prepared in advance (the opening corresponding to the position of the fourth opening 14 in the housing 10). Do it like this.

FIG. 5 is a diagram illustrating the second step in the method for manufacturing the exhaust gas recirculation valve 100 according to the present disclosure.
The second step shown in FIG. 5 is a step of setting the first insert component 20 in the first slide mold 210 following the first step.
Specifically, after the first step is performed, first, the protrusion of the first slide mold 210 is inserted into the opening 22 of the first insert component 20 to hold the first slide mold 210. Let them do it. Next, the first slide mold 210 holding the first slide mold 210 is moved from the opening of the mold 200 (the opening corresponding to the position of the fifth opening 15 in the housing 10) in the direction of arrow B shown in FIG. Make sure to insert it in the direction.

Note that the order of the first step and the second step may be changed.
That is, the first step is a step of setting the first insert component 20 in the first slide mold 210, and the second step is a step of protruding the second insert component 30 following the first step. The second slide die 220 may be set in the cylindrical portion 33.

FIG. 6 is a diagram illustrating the third step in the method for manufacturing the exhaust gas recirculation valve 100 according to the present disclosure.
The third step shown in FIG. 6 is a step of setting a third slide mold 230 for forming the first passage after performing the first step and the second step.
Specifically, after the first step and the second step are performed, the third slide mold is opened from the opening of the mold 200 (the opening corresponding to the position of the first opening 11 in the housing 10). 230 is inserted in the direction of arrow C shown in FIG.

FIG. 7 is a diagram illustrating the fourth step in the method for manufacturing the exhaust gas recirculation valve 100 according to the present disclosure.
The fourth step shown in FIG. 7 is a step of setting a fourth slide mold 240 for forming the second passage after performing the first step and the second step.
Specifically, after the first step and the second step are performed, the fourth slide mold is opened from the opening of the mold 200 (the opening corresponding to the position of the second opening 12 in the housing 10). 240 is inserted in the direction of arrow D shown in FIG.

FIG. 8 is a diagram illustrating the fifth step in the method for manufacturing the exhaust gas recirculation valve 100 according to the present disclosure.
The fifth step shown in FIG. 8 is a step of setting a fifth slide mold 250 for forming the third passage after performing the first step and the second step.
Specifically, after the first step and the second step are performed, the fifth slide mold is opened from the opening of the mold 200 (the opening corresponding to the position of the third opening 13 in the housing 10). 250 is inserted in the direction of arrow E shown in FIG.

Note that the order of the third step, fourth step, and fifth step does not matter. The fifth step, the fourth step, and the third step may be performed in this order, or any other order may be used.
Furthermore, it is also possible to perform the third step, fourth step, and fifth step at the same time.

FIG. 9 is a diagram illustrating the sixth step in the method for manufacturing the exhaust gas recirculation valve 100 according to the present disclosure.
The sixth step shown in FIG. 9 is a step of pouring and casting molten metal after performing the steps from the first step to the fifth step.
Specifically, after the steps from the first step to the fifth step are executed, molten metal such as aluminum alloy is poured from a pouring port (not shown).

FIG. 10 is a diagram illustrating the seventh step in the method for manufacturing the exhaust gas recirculation valve 100 according to the present disclosure.
In the seventh step shown in FIG. 10, after performing the sixth step, the first slide mold 210, the second slide mold 220, the third slide mold 230, the fourth slide mold 240, and the This is the step of removing the fifth slide mold 250.
Specifically, after the sixth step is executed, when the poured molten metal solidifies, the mold 200, the first slide mold 210, the second slide mold 220, and the second slide mold 220 are removed. The third slide mold 230, the fourth slide mold 240, and the fifth slide mold 250 are removed.
By including the first to seventh steps, the first insert component 20 and the second insert component 30 can be insert molded into the housing 10.

FIG. 11 is a diagram illustrating the eighth step in the method for manufacturing the exhaust gas recirculation valve 100 according to the present disclosure.
The eighth step shown in FIG. 11 is a finishing step after insert molding.
Specifically, in the eighth step, the housing 10 is cut to form an opening 22a in a position corresponding to the opening 22 of the first insert component 20. Furthermore, in the eighth step, the first insert component 20 is cut to expose a part of the annular portion 21a so as to function as a valve seat. Furthermore, in the eighth step, the housing 10 is cut to form an opening 32a at a position corresponding to the opening 32 in the lower bottom 31 of the second insert component 30. Further, in the eighth step, cutting is performed to expose a part of the annular portion 31a in the lower bottom portion 31 so that the lower bottom portion 31 of the second insert component 30 functions as a valve seat.
The exhaust gas recirculation valve according to the present disclosure is manufactured by a manufacturing method including such steps.

Here, the conventional double poppet type exhaust gas recirculation valve has a configuration that requires a press-fitting process. If insert molding is considered, for example, due to the positional relationship between the first valve seat or the second valve seat and other built-in parts of the housing, at least one valve seat may need to be removed during insert molding. This is because it cannot be held accurately. Therefore, conventional double poppet exhaust gas recirculation valves are manufactured using a manufacturing method that includes a press-fitting process, and as explained at the beginning, it takes a lot of time and effort to manufacture the valves with good quality through the press-fitting process. In addition to this, conventional double poppet exhaust gas recirculation valves often suffer from poor press-fitting such as galling. In addition, with conventional double poppet exhaust gas recirculation valves, if the press-fit allowance is inappropriately set, heat will be generated and the valve seat will loosen due to, for example, the large difference in linear expansion coefficient between aluminum and stainless steel. Problems such as sticking and falling off occur.
In contrast, as described above, the present disclosure discloses a configuration in which a double poppet type exhaust gas recirculation valve can be insert-molded by a die-casting method. This also solves the above-mentioned problems of the conventional double poppet exhaust gas recirculation valve.

The present disclosure will be summarized and described below.
The present disclosure disclosed the following configuration.
(1)
A double poppet exhaust gas recirculation valve,
A first passage, a second passage, which communicate with a space in which the valve shaft is arranged, are alternately formed along the axial direction of the valve shaft, and are formed in a direction perpendicular to the axis of the valve shaft, and a housing having a third passage;
a first insert part having an annular portion integrally formed in the housing between the first passage and the second passage;
a cylindrical portion formed with a lower bottom portion which is an annular portion integrally formed in the housing between the second passage and the third passage; and an opening communicating with the third passage; , a second insert component having a protruding cylindrical portion protruding from the upper bottom portion of the cylindrical portion;
Exhaust gas recirculation valve with.
Accordingly, the present disclosure has the advantage of being able to provide an exhaust gas recirculation valve configuration that facilitates the manufacture of a double poppet exhaust gas recirculation valve.

The present disclosure further disclosed the following configuration.
(2)
The protruding cylindrical portion of the second insert component has an inner diameter smaller than the inner diameter of the lower bottom portion of the cylindrical portion, and allows the valve shaft to move in the axial direction when the valve shaft is assembled to the housing. To support,
The exhaust gas recirculation valve according to (1) above.
As a result, the present disclosure has a configuration in which the second insert component functions as a valve seat and also as a bearing for the valve shaft, so there is no need to separately position the valve seat and the bearing. This has the advantage that it is possible to provide an exhaust gas recirculation valve configuration that makes it easier to manufacture a poppet-type exhaust gas recirculation valve.

The present disclosure further disclosed the following configuration.
(3)
having a hole formed in the upper bottom of the cylindrical part in the second insert part;
The exhaust gas recirculation valve according to (1) or (2) above.
It was configured so that
As a result, the present disclosure further has the effect that the flow of the molten metal during insert molding is improved, so that the occurrence of cavities can be further suppressed.
Further, the present disclosure has the effect that it is possible to suppress positional displacement of the second insert component, and to provide an exhaust gas recirculation valve with improved quality.

The present disclosure further disclosed the following configuration.
(4)
having a hole formed in the lower bottom of the cylindrical part in the second insert part;
The exhaust gas recirculation valve described in (3) above.
As a result, the present disclosure further has the effect that the flow of the molten metal at the bottom of the second insert component is improved during insert molding, so that the generation of cavities can be suppressed.
Further, the present disclosure has the effect that it is possible to suppress positional displacement of the second insert component, and to provide an exhaust gas recirculation valve with improved quality.

The present disclosure further disclosed the following configuration.
(5)
A comb tooth portion is formed along the outer periphery of the first insert component.
The exhaust gas recirculation valve described in (1), (2), (3), or (4) above.
It was configured so that
Thereby, the present disclosure has the effect that it is possible to further suppress misalignment of the first insert component, and to provide an exhaust gas recirculation valve with improved quality.

The present disclosure disclosed the following manufacturing method.
(6)
A housing having a first passage, a second passage, and a third passage formed alternately along the space in which the valve shaft is arranged and formed in a direction perpendicular to the axis of the valve shaft;
a first insert part having an annular portion integrally formed in the housing between the first passage and the second passage;
a cylindrical portion formed with a lower bottom portion which is an annular portion integrally formed in the housing between the second passage and the third passage; and an opening communicating with the third passage; , a second insert component having a protruding cylindrical portion protruding from the upper bottom portion of the cylindrical portion;
A method of manufacturing a double poppet exhaust gas recirculation valve, comprising:
a first step of setting the first insert part in a first slide mold;
Following the first step, a second step of setting the protruding cylindrical portion of the second insert part in a second slide mold;
After performing the first step and the second step, a third step of setting a third slide mold for forming the first passage;
After performing the first step and the second step, a fourth step of setting a fourth slide mold for forming the second passage;
After performing the first step and the second step, a fifth step of setting a fifth slide mold for forming the third passage;
After performing the steps from the first step to the fifth step, a sixth step of pouring and casting molten metal;
After performing the sixth step, removing the first slide mold, the second slide mold, the third slide mold, the fourth slide mold, and the fifth slide mold. Seven steps and
A method of manufacturing an exhaust gas recirculation valve, comprising insert molding the first insert part and the second insert part into the housing.
As a result, the present disclosure has the advantage that it is possible to provide a method for manufacturing an exhaust gas recirculation valve that facilitates manufacturing of a double poppet type exhaust gas recirculation valve.

The present disclosure disclosed the following manufacturing method.
(7)
A housing having a first passage, a second passage, and a third passage formed alternately along the space in which the valve shaft is arranged and formed in a direction perpendicular to the axis of the valve shaft;
a first insert part having an annular portion integrally formed in the housing between the first passage and the second passage;
a cylindrical portion formed with a lower bottom portion which is an annular portion integrally formed in the housing between the second passage and the third passage; and an opening communicating with the third passage; , a second insert component having a protruding cylindrical portion protruding from the upper bottom portion of the cylindrical portion;
A method of manufacturing a double poppet exhaust gas recirculation valve, comprising:
a first step of setting the protruding cylindrical portion of the second insert part in a second slide mold;
Following the first step, a second step of setting the first insert part in a first slide mold;
After performing the first step and the second step, a third step of setting a third slide mold for forming the first passage;
After performing the first step and the second step, a fourth step of setting a fourth slide mold for forming the second passage;
After performing the first step and the second step, a fifth step of setting a fifth slide mold for forming the third passage;
After performing the steps from the first step to the fifth step, a sixth step of casting the molten metal,
After performing the sixth step, remove the first slide mold, the second slide mold, the third slide mold, the fourth slide mold, and the fifth slide mold. The seventh step,
A method of manufacturing an exhaust gas recirculation valve, comprising insert molding the first insert part and the second insert part into the housing.
As a result, the present disclosure has the advantage that it is possible to provide a method for manufacturing an exhaust gas recirculation valve that facilitates manufacturing of a double poppet type exhaust gas recirculation valve.

Note that, within the scope of the present disclosure, any component of the embodiments may be modified or any component of the embodiments may be omitted.

The exhaust gas recirculation valve according to the present disclosure can be downsized by shortening the overall length of the valve shaft in the axial direction, so it is suitable for use in an exhaust gas recirculation device for a vehicle.

10 Housing, 11 First opening (first passage), 12 Second opening (second passage), 13 Third opening (third passage), 14 Fourth opening, 15 Fifth opening Opening, 20 First insert part, 21 Annular part, 21a Annular part, 22 Opening, 22a Opening, 23 Comb tooth part, 30 Second insert part, 31 Lower bottom part (annular part), 31a Annular part, 32 opening part, 32a opening part, 33 protruding cylinder part, 33a second opening part, 34 cylinder part, 35 upper bottom part, 36 third opening part, 37 opening side lower wall part, 38 hole part, 40 Valve shaft, 40a Shaft, 42 First valve disc, 43 Second valve disc, 50 Spring (biasing member), 100 Exhaust gas recirculation valve, 200 Mold, 210 First slide mold, 220 Second slide type, 230 third slide type, 240 fourth slide type, 250 fifth slide type.

Claims

A double poppet exhaust gas recirculation valve,
A first passage, a second passage, which communicate with a space in which the valve shaft is arranged, are alternately formed along the axial direction of the valve shaft, and are formed in a direction perpendicular to the axis of the valve shaft, and a housing having a third passage;
a first insert part having an annular portion integrally formed in the housing between the first passage and the second passage;
a cylindrical portion formed with a lower bottom portion which is an annular portion integrally formed in the housing between the second passage and the third passage; and an opening communicating with the third passage; , a second insert component having a protruding cylindrical portion protruding from the upper bottom portion of the cylindrical portion;
Exhaust gas recirculation valve with.
The protruding cylindrical portion of the second insert component has an inner diameter smaller than the inner diameter of the lower bottom portion of the cylindrical portion, and allows the valve shaft to move in the axial direction when the valve shaft is assembled to the housing. To support,
An exhaust gas recirculation valve according to claim 1.
having a hole formed in the upper bottom of the cylindrical part in the second insert part;
An exhaust gas recirculation valve according to claim 1 or claim 2.
having a hole formed in the lower bottom of the cylindrical part in the second insert part;
Exhaust gas recirculation valve according to claim 3.
A comb tooth portion is formed along the outer periphery of the first insert component.
An exhaust gas recirculation valve according to claim 1 or claim 2.
A housing having a first passage, a second passage, and a third passage formed alternately along the space in which the valve shaft is arranged and formed in a direction perpendicular to the axis of the valve shaft;
a first insert part having an annular portion integrally formed in the housing between the first passage and the second passage;
a cylindrical portion formed with a lower bottom portion which is an annular portion integrally formed in the housing between the second passage and the third passage; and an opening communicating with the third passage; , a second insert component having a protruding cylindrical portion protruding from the upper bottom portion of the cylindrical portion;
A method of manufacturing a double poppet exhaust gas recirculation valve, comprising:
a first step of setting the first insert part in a first slide mold;
Following the first step, a second step of setting the protruding cylindrical portion of the second insert part in a second slide mold;
After performing the first step and the second step, a third step of setting a third slide mold for forming the first passage;
After performing the first step and the second step, a fourth step of setting a fourth slide mold for forming the second passage;
After performing the first step and the second step, a fifth step of setting a fifth slide mold for forming the third passage;
After performing the steps from the first step to the fifth step, a sixth step of pouring and casting molten metal;
After performing the sixth step, removing the first slide mold, the second slide mold, the third slide mold, the fourth slide mold, and the fifth slide mold. Seven steps and
A method of manufacturing an exhaust gas recirculation valve, comprising insert molding the first insert part and the second insert part into the housing.
A housing having a first passage, a second passage, and a third passage formed alternately along the space in which the valve shaft is arranged and formed in a direction perpendicular to the axis of the valve shaft;
a first insert part having an annular portion integrally formed in the housing between the first passage and the second passage;
a cylindrical portion formed with a lower bottom portion which is an annular portion integrally formed in the housing between the second passage and the third passage; and an opening communicating with the third passage; , a second insert component having a protruding cylindrical portion protruding from the upper bottom portion of the cylindrical portion;
A method of manufacturing a double poppet exhaust gas recirculation valve, comprising:
a first step of setting the protruding cylindrical portion of the second insert part in a second slide mold;
Following the first step, a second step of setting the first insert part in a first slide mold;
After performing the first step and the second step, a third step of setting a third slide mold for forming the first passage;
After performing the first step and the second step, a fourth step of setting a fourth slide mold for forming the second passage;
After performing the first step and the second step, a fifth step of setting a fifth slide mold for forming the third passage;
After performing the steps from the first step to the fifth step, a sixth step of casting the molten metal,
After performing the sixth step, remove the first slide mold, the second slide mold, the third slide mold, the fourth slide mold, and the fifth slide mold. The seventh step,
A method of manufacturing an exhaust gas recirculation valve, comprising insert molding the first insert part and the second insert part into the housing.