WO2006126636A1

WO2006126636A1 - Holder for fuel injector and method of manufacturing the same

Info

Publication number: WO2006126636A1
Application number: PCT/JP2006/310452
Authority: WO
Inventors: Izumi Yoshikawa; Yoshihiko Kambe
Original assignee: Usui Kokusai Sangyo Kaisha, Ltd.; Kobayashi Industrial Co., Ltd.
Priority date: 2005-05-26
Filing date: 2006-05-25
Publication date: 2006-11-30
Also published as: JP2006329080A; JP4415902B2

Abstract

A holder (10) for a fuel injector, wherein a first cylindrical part (12) inserted into a hole part (22) formed in a fuel feed pipe (20), a second cylindrical part (14) formed continuously with the first cylindrical part, disposed projectedly from the fuel feed pipe, and accepting a fuel injector (30) and a flange part (16) formed in a boundary between the first cylindrical part and the second cylindrical part to be swelled in the radial outer direction of the outer peripheral walls of the first and second cylindrical parts and brought into contact with the fuel feed pipe at the peripheral edge of the hole part formed in the fuel feed pipe are formed integrally with each other by press-molding a plate material. Since the wall thickness of the first cylindrical part (12) is formed thinner than that of the second cylindrical part (14) in press-molding, the flange part (16) is formed by the plastically fluidized wall part of the first cylindrical part.

Description

Specification

Holder for fuel injector and method for manufacturing the same

Technical field

[0001] The present invention is a component used in an electronically controlled fuel injection system for a gasoline engine or the like, and a fuel for attaching a fuel injector to a fuel supply pipe (also referred to as a delivery pipe) for supplying fuel to an intake pipe or a cylinder The present invention relates to an injector holder and a method for manufacturing the same.

Background art

[0002] A holder for a fuel indicator shown in Japanese Patent Application Laid-Open No. 2003-120466 is provided with a second cylindrical portion that accepts a fuel indicator with a narrow inner diameter of a first cylindrical portion inserted into a fuel supply pipe. A stepped portion was formed in a region where the inner diameter was wide and the difference in inner diameter was generated.

[0003] In such a fuel injector holder, as pointed out in Patent Document 2, the noise force generated at the fuel supply port of the fuel injector is reflected by the step portion present on the inner wall of the fuel injector holder. A standing wave is generated. This standing wave caused the fuel supply pipe to resonate, causing noise to be transmitted, propagated and radiated around the fuel supply pipe.

[0004] Therefore, as disclosed in Japanese Patent Application Laid-Open No. 2003-314405, the first inserted into the fuel supply pipe.

It has been proposed to increase the inner diameter of the cylindrical portion of 1.

[0005] However, if the inner diameter of the first tubular portion is increased, it is difficult to secure a fitting area between the first tubular portion and the fuel supply pipe.

Disclosure of the invention

[0006] An object of the present invention is to provide a holder for a fuel injector capable of increasing the reliability of brazing to a fuel supply pipe while having a structure that is inexpensive to manufacture and can reduce the generation, transmission and propagation of noise. It is in providing the manufacturing method.

[0007] In the first to third aspects of the present invention, in the fuel injector holder for connecting the fuel injector to the fuel supply pipe,

A first tubular portion inserted through a hole formed in the fuel supply pipe; A second cylindrical portion that is connected to the first cylindrical portion and is disposed so as to protrude from the fuel supply pipe, and that receives the fuel injector;

At the boundary between the first cylindrical portion and the second cylindrical portion, the outer periphery of the first and second cylindrical portions bulges outward in the radial direction, and the peripheral edge of the hole portion A flange portion that comes into contact with the fuel supply pipe at

Has a basic structure that is integrally formed by pressing a plate material.

[0008] When the first cylindrical portion is inserted into the hole of the fuel supply pipe, the flange portion bulging outward in the radial direction from the first and second cylindrical portions is formed at the periphery of the hole portion. It contacts the fuel supply pipe. Since the brazing material permeates between the flange and the fuel supply pipe due to the capillary phenomenon and turns into a washer, a brazing area is secured and brazing reliability is improved.

[0009] Here, in the first aspect of the present invention, the flange portion is formed by the flesh portion that has flowed when the thickness of the first tubular portion is reduced to be thinner than the thickness of the second tubular portion. Part is molded. As described above, since the flange portion can be formed by press carriage, it does not complicate the process, increase the product weight, and increase the product cost as in Comparative Example 1 (see FIG. 14) described later. As in Comparative Examples 2 and 3 (see Fig. 15 and Fig. 16), there is no problem that the plating solution remains in the overlapping part of the plate material and corrodes.

[0010] In the second aspect of the present invention, the first aspect of the present invention is defined by the shape of the flange portion. That is, the thickness of the first cylindrical portion is formed to be thinner than the thickness of the second cylindrical portion (the thickness of the first cylindrical portion is the thickness of the second cylindrical portion). The flange portion is formed into a taper shape in which the outer diameter decreases as the first cylindrical portion force moves away in the axial direction. Yes. This shape is a characteristic shape of the flange portion formed by the plastically flowd wall portion by reducing the thickness of the first cylindrical portion thinner than the thickness of the second cylindrical portion. is there.

[0011] In the first and second aspects, the first cylindrical portion and the second cylindrical portion can both have the same inner diameter, but a step shown in Fig. 7 to be described later is added. Thus, the shape of the third aspect of the present invention can be obtained.

[0012] The third aspect of the present invention defines a structure formed by performing the process of FIG.

That is, the thickness of the first cylindrical portion is formed thinner than the thickness of the second cylindrical portion (previous The first cylindrical part force is the same as the first aspect in that the thickness of the first cylindrical part is reduced to be thinner than the thickness of the second cylindrical part), and the first cylindrical part force is the flange part. The inner diameter of the region extending to is formed slightly smaller than the inner diameter of the second cylindrical portion.

In the first to third aspects of the present invention, the first tubular portion is chamfered between the insertion end surface and the outer peripheral wall surface at the insertion end portion inserted into the hole portion of the fuel supply pipe. Forming part Force S This makes it easier to insert the first cylindrical portion into the hole of the fuel supply pipe, improving workability.

In the first to third aspects of the present invention, the chamfered portion is formed between the receiving end surface and the inner peripheral wall surface at the receiving end portion where the second cylindrical portion receives the fuel injector. Is possible. This makes it easier to accept the fuel injector in the second cylindrical part, improving workability.

In the first to third aspects of the present invention, the second cylindrical portion may have at least one positioning protrusion that protrudes radially outward at the receiving end. This positioning protrusion is used to prevent the fuel injector from rotating.

[0016] A fourth aspect of the present invention is a method for manufacturing a holder for a fuel injector for connecting a fuel injector to a fuel supply pipe.

A step of drawing a plate material a plurality of times to form a drawn product having a closed top portion, a cylindrical portion following the top portion, and an open end flange formed at an open end of the cylindrical portion; The top force of the processed product is obtained by performing processing to reduce the thickness of the outer peripheral wall of the region up to the middle of the cylindrical portion, so that the first thickness having the side wall thickness smaller than the thickness of the cylindrical portion and the top portion is obtained. By reducing the thickness of the cylindrical processed portion, the second cylindrical processed portion having the same side wall thickness as the cylindrical portion and the opening end flange portion, and the outer peripheral wall of the drawn product. Forming a flanged workpiece having a flange portion protruding radially outwardly at a boundary between the first and second cylindrical processed portions by a plastic flowing meat portion;

Forming a hole having a diameter that is the same as or slightly smaller than the inner diameter of the first cylindrical processing portion at the top of the first cylindrical processing portion; and

It is characterized by having.

[0017] By this production method, the fuel injector holder according to the first and second aspects of the present invention is preferably used. Can be manufactured. Furthermore, the dimensional accuracy of the holder that maintains a relatively small pressing load for forming the flange portion is maintained, and the die accuracy is maintained and the die life is improved.

[0018] In the fourth aspect of the present invention, as a pre-process of the step of forming the flanged product, the top side of the drawn product on the inner peripheral wall of the cylindrical portion with the first step as a boundary. An inner diameter difference is formed so that the inner diameter of the cylinder is reduced, and the outer diameter force S on the top side is reduced at the outer peripheral wall of the cylindrical portion of the drawn product with the second step as a boundary. The method may further include a step of forming an outer diameter difference. By using the second step portion formed by performing this pre-process, the flange portion can be formed more easily and a larger diameter flange portion can be formed. Further, by adding this pre-process, the holder for the fuel indicator according to the third aspect of the present invention can be suitably manufactured.

Brief Description of Drawings

FIG. 1A and FIG. 1B are a cross-sectional view and a bottom view of a holder for a fuel indicator according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a fuel supply pipe with a fuel injector attached via a fuel injector holder.

FIG. 3 is a partially enlarged sectional view of FIG.

FIG. 4A to FIG. 4L are views showing a forming process of a holder for a fuel injector according to an embodiment of the present invention.

FIG. 5 is a sectional view of a second step (primary drawing step).

FIG. 6 is a sectional view of a seventh step (final drawing step).

FIG. 7 is a sectional view of an eighth step (step drawing step).

FIG. 8 is a sectional view of a ninth step (flange forming step).

FIG. 9 is a diagram showing the thickness reduced in the ninth step.

FIG. 10 is a sectional view of a tenth step (drilling step).

FIG. 11 is a sectional view of an eleventh step (chamfering step).

FIG. 12 is a sectional view of a twelfth step (trimming step).

FIG. 13 is a diagram showing a modification of the process in FIG. 8.

[FIG. 14] FIGS. 14A to 14C are plan views of a holder for a fuel injector according to Comparative Example 1. FIG. 6 is a cross-sectional view and a bottom view.

FIG. 15A and FIG. 15B are a cross-sectional view and a bottom view of a holder for a fuel indicator according to Comparative Example 2.

16A and 16B are a cross-sectional view and a bottom view of a fuel injector holder according to Comparative Example 3, respectively.

BEST MODE FOR CARRYING OUT THE INVENTION

[0020] (Fuel injector holder)

FIG. 1A is a sectional view of a holder for a fuel injector according to an embodiment of the present invention, and FIG. 1B is a bottom view thereof. FIG. 2 is a cross-sectional view of the fuel supply pipe to which the fuel injector 1 is attached via the fuel injector holder shown in FIGS. 1A and 1B. FIG. 3 is a partially enlarged sectional view of FIG.

In FIG. 2, four holes 22 are formed at a desired interval on the bottom surface of the fuel supply pipe 20 in the case of, for example, four cylinders (only one hole is shown in FIG. 2). A fuel indicator holder 10 is inserted into the hole 22 and brazed (see FIG. 3). Further, the fuel injector 30 is held in a liquid-tight manner by the O-ring 32 in the holder 10 for the fuel injector. The fuel supplied to the fuel supply pipe 20 is distributed to, for example, four fuel injector holders 10 and a fuel injector 30 held by them. This fuel is directly injected into each cylinder, for example, from injection nozzles (not shown) provided at the tips of the four fuel injectors 30.

In FIG. 1A and FIG. 1B, the fuel injector holder 10 is connected to a first cylindrical portion 12 inserted into a hole portion 22 formed in the fuel supply pipe 20 and the first cylindrical portion 12. And a second cylindrical portion 14 which is disposed so as to protrude from the fuel supply pipe 20 and receives the fuel injector 30. Further, the fuel injector holder 10 is radially outward from the outer peripheral walls of the first and second cylindrical portions 12 and 14 at the boundary between the first cylindrical portion 12 and the second cylindrical portion 14. It has a flange portion 16 which is swelled in the direction and contacts the fuel supply pipe 20 at the periphery of the hole portion 22.

[0023] At the insertion end where the first cylindrical portion 12 is inserted into the hole 22 of the fuel supply pipe 20, a chamfered portion such as a C surface or an R surface is provided between the insertion end surface 12A and the outer peripheral wall surface 12B. 12C is molded. The chamfered portion 12C makes it easy to insert the first cylindrical portion 12 into the hole portion 22.

[0024] On the other hand, at the receiving end where the second tubular portion 14 receives the fuel injector 30, a chamfered portion 14C such as a C surface or an R surface is formed between the receiving end surface 14A and the inner peripheral wall surface 14B. Yes. The chamfered portion 14C makes it easy to receive the fuel injector 30 in the second cylindrical portion 14.

[0025] The second cylindrical portion 14 may have at least one protruding radially outward at the receiving end, and two positioning protrusions 18 in FIG. 1B. The positioning protrusion 18 is used to prevent the fuel injector 30 from rotating.

[0026] The first and second cylindrical portions 12, 14, the flange portion 16, and the positioning projection 18 are integrally formed by pressing a plate material such as SPCE, SPCC, or SUS material. In particular, the flange portion 16 is formed by a wall portion that has been plastically flowed during press-cage where the thickness of the first tubular portion 12 is reduced to be thinner than the thickness of the second tubular portion 14. As shown in FIGS. 1A and 3, the flange portion 16 formed by such press caloe has a flange surface 16A larger than the outer diameter of the first and second cylindrical portions 12 and 14, and has an axial direction. And has a characteristic shape having a tapered portion 16B whose outer diameter decreases as the distance from the first cylindrical portion 12 increases.

[0027] As shown in FIG. 3, the thickness T1 of the first cylindrical portion 12 is formed thinner than the thickness T2 of the second cylindrical portion (T1 <T2), and the first cylindrical shape The outer diameter D1 of the part 12 is smaller than the outer diameter D2 of the second cylindrical part (D1 <D2).

As shown in FIG. 3, the fuel injector holder 10 of the present embodiment has an inner diameter dl force in a region A extending from the first cylindrical portion 12 to the flange portion 16 and an inner diameter of the second cylindrical portion. Force slightly smaller than d2 (dl <d2) It is also possible to form dl = d2 = d5 as described later.

In this fuel injector holder 10, as shown in FIG. 2, the inner diameter dl of the fuel injector holder 10 is the same size as the inner diameter d2 of the second cylindrical portion! / Is slightly smaller! /寸法 Because of the size, the inner diameter dl can be set to more than twice the inner diameter d3 of the fuel supply hole 33 of the fuel injector 30. This is because the inner diameter d2 of the second cylindrical portion 14 to which the fuel injector 30 is closely attached via the O-ring 32 is equal to the inner diameter d3 of the fuel supply hole 33 of the fuel injector 30. This is because it is twice or more. Therefore, as in the invention of Japanese Patent Laid-Open No. 2003-3144405, noise emitted from the fuel supply hole 33 of the fuel injector 30 hardly reflects in the fuel injector holder 10. In other words, no standing wave due to resonance is generated in the fuel injector holder 10. As a result, the noise emitted from the fuel supply hole 33 of the fuel indicator 30 is at least flexible on the wall portion at a position facing the hole portion 22, preferably on the wall portion extending over the entire length of the fuel supply pipe 20. Attenuated by a subsurface (for example, thin plate) 24, noise generation and transmission 'propagation' radiation can be reduced

[0030] Since this fuel injector holder 10 integrally has a flange portion 16 larger than the outer diameter D1 of the first cylindrical portion 12, it is possible to increase the brazing reliability of the fuel supply pipe 20. Can do.

[0031] The reason for this is as follows. In FIG. 3, the brazing region 40 of the fuel indicator holder 10 with respect to the fuel supply pipe 20 is shown by hatching. FIG. 3 exaggerates the gap between the fuel supply pipe 20 and the holder 10 in order to easily explain the brazing region 40. The brazing material to which the outer force of the fuel supply pipe 20 is also supplied penetrates into the fuel supply pipe 20 by the capillary phenomenon. In particular, the ring-shaped flange surface 16A of the flange portion 16 and the fuel supply pipe 20 are firmly fixed in a washer shape by the brazing material, and brazing reliability can be improved.

[0032] (Comparative example)

FIG. 14 shows a fuel heater holder 300 as Comparative Example 1 formed by forging and cutting. This holder 300 is made by cutting steel bars in size → Phosphoric coating on the outer surface (bonding process) → Sizing process (flat pressing process) → Cold forging cage → Cutting process → Roll bash process (O (Roughness and roundness of the sealing surface of the ring 32) are formed.

[0033] The holder 300 according to Comparative Example 1 has high product costs due to the material cost of the bar and many manufacturing processes. In addition, if the area of the flange surface 302 is secured to increase the reliability of brazing, the thickness t increases and the product weight increases and the product cost further increases. The fuel injector holder 10 of this embodiment is about 1 compared to Comparative Example 1. 0% light weight was achieved.

FIG. 15 and FIG. 16 show the fuel injector holders 310 and 320 of Comparative Examples 2 and 3, which are formed by bead (stretching) or goose folding after the plate material is drawn in several steps. Show.

[0035] The disadvantage of Comparative Examples 2 and 3 is that when the holders 310 and 320 are mated in a dip tank, the plating liquid remains in the overlapping portions 312 and 322 of the steel material, causing corrosion. In addition, there is a disadvantage that the press load (about 3 tons with an inner diameter of about 13 mm) for forming the flange portion by the overlapping portions 312 and 322 of the steel material becomes large. Power! In addition, when pressing the overlapping parts 312, 322 of the steel material, the high inner diameter accuracy and roundness obtained by drawing cannot be maintained due to deformation caused by the load during processing. There is also a problem. In terms of accuracy, it is difficult to obtain the accuracy of perpendicularity and flatness with respect to the shaft core for the flanges obtained by the overlapping portions 312 and 322 of the steel material.

[0036] According to the fuel injector holder 10 of the present embodiment, it is possible to eliminate all the deficiencies of Comparative Example 1 and 3 and to reduce the maximum press load by 50% or more compared to Comparative Examples 2 and 3, for example, about It. Can be molded. In addition, many molds can be shared for many product variations in which the inner diameter dl and the outer diameter D1 of the first cylindrical portion 12 are different, and it is possible to respond quickly to design changes.

[0037] (Production method)

4A to 4L show a process in which the fuel injector holder 10 according to the embodiment of the present invention is formed stepwise from a blank 50 obtained by cutting a strip-shaped steel material. In the first stage, a strip-shaped steel material is press-cut to obtain a blank 50 having a predetermined dimension shown in FIG. 4A.

[0038] This blank 50 is subjected to primary drawing to fifth drawing 60, 62, 64, 66, 68 and final drawing 70 in a plurality of steps, for example, six steps, as shown in FIGS. 4B to 4G. It is drawn sequentially. As a result, as shown in FIG. 4G, the final drawn product 70 having the closed top portion 72, cylindrical portion 74, and opening flange 76 is formed. The number of drawing steps can be changed as appropriate according to the drawing ratio, which is the ratio between the inner diameter and the depth of the final drawn product 70 shown in FIG. 4G.

FIG. 5 shows a processing step (second step) of the primary drawn product 60 shown in FIG. 4B. Fig 5 The blank holder 202 supported by the cushion pin 200 and capable of moving up and down is initially set flush with the upper surface of the punch 204. On the blank holder 202 and the punch 204, the blank 50 subjected to the first press cutting step is carried. Thereafter, when the die 206 is lowered, the blank holder 202 is pushed down integrally with the cushion pin 200, and the primary drawn product 60 is formed by the punch 204 and the die 206. In this initial drawing process, the edge of the steel material is held between the die 206 and the blank holder 202 in the process of forming the primary drawn product 60, so that “wrinkles” occur in the steel material. There is no. That is, the blank holder 202 functions as a “wrinkle” restraint. Thereafter, when the force of the die 206 is increased, the primary drawn product 60 is removed from the punch 204 and the die 206 by the blank holder 202 and the knockout pin 208 biased by the spring, and can be carried out to the next process.

[0040] The secondary to fifth drawing products 62 to 68 are similarly formed by punches and dies. However, as the second drawing (third step) proceeds to the fifth drawing (sixth step). The diameter of the punch is gradually reduced, and the drawing ratio (depth Z aperture) is increased.

FIG. 6 shows a seventh step in which the fifth drawn product 68 is processed into a drawn final drawn product 70. In FIG. 6, the fifth drawn product 68 is placed on the punch 214 protruding from the lifter plate 212 supported by the cushion pin 210, and the final drawing is performed by the punch 214 and the die 216 as the die 216 descends. Processed product 70 is formed. The final drawn product 70 is removed from the punch 214 and the die 216 by the lifter plate 212 and the knockout pin 218 when the die 216 is raised, and can be carried out to the next process.

[0042] In the eighth step, which is the next step, the step force product 80 shown in FIG. 4H is step drawn. Figure 7 shows the stage drawing process. In the process of FIG. 7, as shown in FIG. 4H, a stepped processed product having a first cylindrical primary processed portion 82, a second cylindrical primary processed portion 84, and a receiving side inner peripheral tapered surface 86. 80 is formed. Here, the outer diameter D3 of the first cylindrical primary casing portion 82 (which is larger than the outer diameter D1 of the finished product 10) is the outer diameter D2 of the second cylindrical primary casing portion 84 (the finished product). The outer wall step portion 85 is provided in a region having a difference in outer diameter that is smaller than the outer diameter D2 of 10. Also, the inner diameter dl of the first cylindrical primary casing portion 82 (equal to the inner diameter dl of the finished product 10) is equal to the inner diameter d2 of the second cylindrical primary processed portion 84 (equal to the inner diameter d2 of the finished product 10). ) Smaller than that A stepped portion 87 is provided at a position having a diameter difference.

[0043] In order to form the stepped force product 80, a lifter plate 222, a punch 224, a die 226, and a knockout pin 228 supported by the cushion pin 220 are used. The punch 224 defines an inner wall stepped portion 87 of the stepped processed product 80 and an inner peripheral wall of the second cylindrical primary processed portion 84 at the time of clamping. The punch 224 further defines a receiving inner tapered surface 86 (see FIG. 4H). On the other hand, the die 226 has an inner peripheral wall that defines an outer peripheral wall of the first cylindrical primary processed portion 84, an outer wall stepped portion 85 (see FIG. 4H), and the like.

In the mold clamping state shown in FIG. 7, the lifter plate 222 is in contact with the base 229 of the press machine, and the cushion pin 220 does not work. By clamping the mold as shown in FIG. 7, the step force product 80 described above is formed. Thereafter, as the die 226 is raised, the stepped force product 80 is removed from the punch 224 and the die 226 by the lifter plate 222 and the knockout pin 228, and can be carried out to the next process.

FIG. 8 shows the flange forming process (9th process). As shown in FIG. 41, the process shown in FIG. 8 has a flange having a first cylindrical secondary machining portion 92, a second cylindrical primary machining portion 94 (84), and a flange portion 96 therebetween. The accessory 90 is molded. Note that the second cylindrical primary product 94 is substantially the same as the second cylindrical primary force product 84 of FIG.

In order to mold the flanged casing 90, a lifter plate 232 supported by the cushion pin 230, a punch 234, a die 236, and a knockout pin 238 are used. The notch 234 has the same shape as the punch 224 in FIG. On the other hand, the die 236 is formed on the inner wall surface 2 36 A having an inner diameter d4 (d4 = Dl) smaller than the outer diameter D3 of the first cylindrical primary casing portion 82 shown in FIG. It has a flange forming surface 236B.

In the mold clamping state shown in FIG. 8, the lifter plate 232 is in contact with the base 239 of the press machine, and the cushion pin 230 does not work. By clamping the mold as shown in Fig. 8, the wall thickness is reduced on the outer wall side of the cylindrical secondary processing portion 92 (Ayung process), and the flange portion 96 is formed by the wall portion that has undergone plastic flow due to the thickness variation. Is done.

The flange surface of the flange portion 96 is formed flat by the flange forming surface 236A of the die 236. This state power is shown in Figure 9. As shown in FIG. 9, the wall thickness tl with reduced force in the cylindrical secondary machining portion 92 plastically flows and contributes to the formation of the flange portion 96. afterwards, As the die 236 rises, the lift plate 90 and the knockout pin 238 remove the flanged force product 90 from the punch 234 and the die 236, and can be carried out to the next process.

FIG. 10 shows a drilling process (tenth process). 10, as shown in FIG. J, the first cylindrical tertiary casing portion 102 having a hole 102B formed in the top portion 102A, and the second cylindrical primary processing portion 104 (84, 94) A perforated article 100 having the following is formed. The second cylindrical primary force product 104 is substantially the same as the second cylindrical primary force product 84, 94 of FIGS.

[0049] In order to form the holed casing 100, a lifter plate 242 supported by the cushion pin 240, a punch 244, a die 246, and a killer pin 248 are used. The die 246 is lowered together with the killer pin 248, and after the killer pin 248 comes into contact with the lifter plate 242, the lowering of the die 246 and the killer pin 248 is stopped. In the middle of the lowering of the die 246, the punch 244 is fixed at a position where the tip of the punch 244 penetrates into the center hole 246A of the die 246. While the die 246 is being lowered, a hole 102B having an inner diameter d5 is formed by the die 246 and the punch 244 at the top 102A of the first cylindrical tertiary workpiece 102, and the scrap 102C remains at the tip of the punch 244. It is. After that, as the die 246 is raised, the holed workpiece 100 is removed from the punch 244 by the lifter one plate 242 and can be carried out to the next process.

FIG. 11 shows a chamfering process (11th process). As shown in FIG.4K, the first cylindrical quaternary processed portion 112 having the chamfered portion 112C and the second cylindrical primary calcare portion 114 (84, 94, 104) are formed by the process of FIG. The processed product 110 with the chamfered portion is formed. That is, in the first cylindrical quaternary processed portion 112, the chamfered portion 112C is formed between the insertion end surface 112A and the outer peripheral wall surface 112B at the insertion end portion inserted into the hole 22 of the fuel supply pipe 20. It has been.

[0051] In order to form the processed product 110 with the chamfered portion, the lifter plate 252 supported by the cushion pin 250, the punch 254, the die 256, and the killer pin 258 are used. As in FIG. 10, while the die 256 is descending, the punch 254 is fixed at a position where the tip of the punch 254 penetrates into the reverse tapered portion 256B formed in the opening of the central hole 256A of the die 256. It has been determined. While the die 256 is descending, the outer periphery of the top of the first cylindrical quaternary force product 112 is chamfered by the reverse tapered portion 256B of the die 256. After that, as the die 256 rises, the lift plate 252 removes the chamfered force product 110 from the punch 254 so that it can be taken out to the next process.

FIG. 12 shows the final trimming process (12th process). As shown in FIG. 4L, the bottom opening flange is trimmed by the process of FIG. 12 and scrap 19 is removed, so that the fuel indicator as a finished product in which the two positioning protrusions 18 shown in FIGS. 1A and 1B are formed is formed. A holder 10 for the kakuta is formed. That is, when the die 262 is driven downward with respect to the punch 260 shown in FIG. 12, the two positioning protrusions 18 are punched. Thereafter, the finished product 10 is removed from the punch 260 by the knockout pin 264 as the die 262 is raised.

[0053] Here, there is a customer need to ensure high injection efficiency in the fuel injector 30, and therefore the inner diameter dl of the first cylindrical portion 12 needs to be designed according to the customer need. Changing the inner diameter dl of the first cylindrical portion 12 also changes the outer diameter D1. In the manufacturing method described above, the inner diameters dl and d5 and the outer diameter Dl of the first cylindrical portion 12 can be changed flexibly during the drawing process. Therefore, most molds are shared by many nouris- tions, and the total cash cost including the molds can be reduced.

[0054] The quality check target of the fuel injector holder 10 includes not only the inner diameter d2 of the second cylindrical portion 14 in which the fitting tolerance with the O-ring 32 is important, the surface roughness and roundness there, but also the first For example, the coaxiality of the first cylindrical portion 12 and the perpendicularity between the first cylindrical portion 12 and the flange surface 16A. In the manufacturing method described above, since the flange portion 16 can be formed with a relatively small press load, the dimensions can be maintained without being deformed by the press load, so that the quality fluctuation of the fuel injector holder 10 is extremely small. Furthermore, since the press load is relatively small, the precision of the mold can be maintained and the mold life can be improved.

Note that the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the gist of the present invention.

[0056] The flange forming step shown in FIG. 8 can be performed with higher dimensional accuracy by the mold structure shown in FIG. In FIG. 13, the mold structure shown in FIG. The number of slider cams 272 corresponding to this is added.

In FIG. 13, when each driver cam 270 is lowered integrally with the die 236, each slider one cam 272 is driven in a direction approaching each other. As a result, before the die 236 molds the flange portion 16, the second cylindrical primary processed portion 94 is held from the outer wall side by each slider cam 272. Therefore, before the die 236 molds the flange portion 16, the second cylindrical primary force product 94 is held by the punch 234 on the inner wall and the slider cam 272 on the outer wall. Thereby, when the die 236 molds the flange portion 16, it is possible to reliably prevent the second cylindrical primary processing portion 94 from being deformed.

Further, in the present invention, the step of FIG. 7 can be omitted. Instead, the flange portion 16 can be directly formed on the final drawn product 70 shown in FIG. 7 using the mold structure shown in FIG. 8, and more preferably, the shape shown in FIG. In this case, the portion of the outer diameter reduced by the die 236 becomes the first cylindrical portion 12, and in the process of forming the first cylindrical portion 12, the thickness of the region is reduced, and the thickness variation The flange portion 16 can be formed by the plastic flow of the meat portion generated by the above. As the punch used in this case, the punch 214 shown in FIG. 6 connected to the stepped punch 234 whose diameter is reduced at the tip as shown in FIG. 8 can be used. Therefore, in this case, the inner diameter dl of the first and second cylindrical portions 12 and 14 coincides with the inner diameter d2 shown in FIG. 1B (dl = d2), and there is no difference in inner diameter.

Claims

The scope of the claims

[1] Fuel injector holder for connecting the fuel injector to the fuel supply pipe

A first tubular portion inserted through a hole formed in the fuel supply pipe;

A second cylindrical portion that is connected to the first cylindrical portion and is disposed so as to protrude from the fuel supply pipe, and that receives the fuel injector;

At the boundary between the first cylindrical portion and the second cylindrical portion, the outer peripheral wall of the first and second cylindrical portions is bulged and formed radially outward, and the hole portion A flange portion contacting the fuel supply pipe at the periphery;

Is integrally molded by pressing the plate material,

The flange portion is formed by a thickened portion that is plastically flowed by reducing the thickness of the first cylindrical portion to be thinner than the thickness of the second cylindrical portion. Holder for injector.

[2] Fuel injector holder for connecting the fuel injector to the fuel supply pipe

A first tubular portion inserted through a hole formed in the fuel supply pipe;

A second tubular portion that is connected to the first tubular portion and is disposed so as to protrude from the fuel supply pipe, and to which the fuel indicator is mounted;

Is integrally molded by pressing the plate material,

The thickness of the first cylindrical portion is formed to be thinner than the thickness of the second cylindrical portion, and the flange portion is configured to force the first cylindrical portion away from the axial direction. The holder for the fuel injector is characterized by being formed into a taper shape with an outer diameter force S that decreases with time.

[3] Fuel injector holder for connecting the fuel injector to the fuel supply pipe

A first tubular portion inserted through a hole formed in the fuel supply pipe; A second tubular portion that is connected to the first tubular portion and is disposed so as to protrude from the fuel supply pipe, and to which the fuel indicator is mounted;

Is integrally molded by pressing the plate material,

The thickness of the first cylindrical portion is formed thinner than the thickness of the second cylindrical portion, and the inner diameter of the region reaching the flange portion is the first cylindrical portion force. A holder for a fuel injector, wherein the holder is formed to be slightly smaller than the inner diameter of the cylindrical portion.

[4] In claim 1 or 2,

The fuel injector holder, wherein the first cylindrical portion and the second cylindrical portion both have the same inner diameter.

[5] In any one of claims 1 to 4,

A chamfered portion is formed between the insertion end surface and the outer peripheral wall surface at the insertion end portion where the first cylindrical portion is inserted into the hole portion of the fuel supply pipe. holder.

[6] In any one of claims 1 to 5,

The holder for a fuel injector, wherein a chamfered portion is formed between the receiving end surface and the inner peripheral wall surface at the receiving end portion where the second cylindrical portion receives the fuel injector.

[7] In claim 6,

The fuel injector holder, wherein the second cylindrical portion has at least one positioning protrusion protruding outward in a radial direction at the receiving end.

[8] A holder for a fuel injector for connecting a fuel injector to a fuel supply pipe.

A step of drawing a plate material a plurality of times to form a drawn product having a closed top portion, a cylindrical portion following the top portion, and an open end flange formed at an open end of the cylindrical portion; Reduce the wall thickness of the outer peripheral wall of the region up to the middle of the cylindrical part By performing the shearing process, the thickness of the side wall is thinner than the thickness of the tube portion and the top portion is provided.

Reduce the thickness of the cylindrical processing portion of the first cylindrical processing portion, the second cylindrical processing portion having the same side wall thickness as the cylindrical portion and the opening end flange portion, and the outer peripheral wall of the drawn product. Forming a flanged workpiece having a flange portion protruding radially outwardly at the boundary between the first and second cylindrical processed portions by the plastically flowing meat portion;

A method for producing a holder for a fuel injector, comprising:

In claim 8,

As a pre-process of the molding process of the flanged product, a difference in inner diameter is formed on the inner peripheral wall of the cylindrical portion of the drawn product so that the inner diameter on the top side becomes smaller from the first step. And forming an outer diameter difference at the outer peripheral wall of the cylindrical portion of the drawn product so as to reduce the outer diameter force S on the top side from the second stepped portion. A fuel injector holder manufacturing method characterized by the above.