KR20170054931A - Fuel rail having high intensity assembling structure - Google Patents

Fuel rail having high intensity assembling structure Download PDF

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Publication number
KR20170054931A
KR20170054931A KR1020150157702A KR20150157702A KR20170054931A KR 20170054931 A KR20170054931 A KR 20170054931A KR 1020150157702 A KR1020150157702 A KR 1020150157702A KR 20150157702 A KR20150157702 A KR 20150157702A KR 20170054931 A KR20170054931 A KR 20170054931A
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KR
South Korea
Prior art keywords
end cap
delivery pipe
filler material
groove
circumferential surface
Prior art date
Application number
KR1020150157702A
Other languages
Korean (ko)
Inventor
오연지
강영일
구광원
권명훈
Original Assignee
주식회사 현대케피코
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 주식회사 현대케피코 filed Critical 주식회사 현대케피코
Priority to KR1020150157702A priority Critical patent/KR20170054931A/en
Publication of KR20170054931A publication Critical patent/KR20170054931A/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
    • F02M55/025—Common rails
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/004—Joints; Sealings
    • F02M55/005—Joints; Sealings for high pressure conduits, e.g. connected to pump outlet or to injector inlet
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8084—Fuel injection apparatus manufacture, repair or assembly involving welding or soldering

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

The present invention relates to a fuel rail having a high intensity assembling structure, wherein as an end cap is fixedly coupled to an outer circumferential surface in both end portions of a delivery pipe in a state in which filler metal is inserted into a filler metal groove formed in an inner circumferential surface of the end cap, fuel pressure which flows in an internal side of the delivery pipe and is applied to the end cap becomes weakened, thereby preventing occurrence of damage or a crack of the end cap.

Description

[0001] FUEL RAIL HAVING HIGH INTENSITY ASSEMBLING STRUCTURE [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel rail, and more particularly, to a fuel rail having a high-strength assembly structure capable of preventing an end cap welded to both ends of a delivery pipe from being damaged due to pressure.

Generally, the fuel pumped from the fuel tank of the automobile and pumped at a constant pressure is introduced into the fuel rail and injected into each cylinder of the engine. In the return fuel supply device, an inlet through which fuel enters from the fuel tank is provided, And the remaining fuel is injected into the engine at the fuel rail where a plurality of outlets for supplying fuel to each cylinder of the cylinder are provided, and the remaining fuel is returned to the fuel tank through the pressure regulator.

BACKGROUND ART [0002] In recent years, a returnless fuel supply apparatus is often used in which a pressure regulator is not equipped to control the pressure on one side of a fuel rail to recover surplus fuel to a fuel tank.

Such a conventional fuel rail is shown in Fig.

As shown in the drawing, the conventional fuel rail 10 includes a delivery pipe 20 for guiding fuel, an end cap 30 to which both ends of the delivery pipe 20 are connected, a flange 20 formed on the outer peripheral surface of the delivery pipe 20, And a socket 40 to which the injector 50 is coupled.

In the delivery pipe 20, a flow path is formed through which fuel flows inwardly in the shape of a pipe passing through both ends, and both ends are closed by the end cap 30.

The end cap 30 is coupled to both ends of the delivery pipe 20 and is fixed by welding is disclosed in Korean Patent Laid-Open Publication No. 2012-0097251 (2012.03.03: patent document 1).

2, the end cap 30 is coupled to the end of the delivery pipe 20 and is inserted into the inner circumferential surface of the delivery pipe 20 together with the consumable material ring 60, To the pipe (20).

That is, the engagement groove 21 in which the end cap 30 is fitted is formed on the inner circumferential surface of the end portion of the delivery pipe 20 with an inner diameter larger than the inner diameter of the delivery pipe 20 to form the step 22, After the end cap 60 is temporarily fixed by fitting the end cap into the engaging groove 21 in a state where the abutment ring 60 is supported on the end cap 60 and the end cap 60 is supported by the end cap 60, 30 and the inner circumferential surface of the engaging groove 21 so as to engage the end cap 30 with the delivery pipe 20.

However, the conventional fuel rail 10 has a problem that when the consumable material ring 60 is melted and fixed between the outer circumferential surface of the end cap 30 and the inner circumferential surface of the coupling groove 21 of the delivery pipe 20, A space is formed between the stepped portion 22 of the end cap 30 and the end cap 30, that is, at the position where the consumable material ring 60 is inserted, and the inner peripheral surface of the end cap 30 is formed small, The end cap 30 protrudes further than the inner diameter of the end cap 30 so that the pressure from the fuel is further applied to the end cap 30 through the space and the protruded portion of the end cap 30, There was a problem.

Korean Unexamined Patent Application Publication No. 2012-0097251 (Mar. 3, 2012)

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide an end cap assembly for a vehicle, The present invention has been made to solve the above problems.

According to an aspect of the present invention, there is provided a fuel supply system including a delivery pipe having both ends thereof penetrating, a flow path formed on an inner side thereof, and a connection hole communicating with a flow path on an outer circumferential surface thereof; And an end cap coupled to both ends of the delivery pipe to close both ends of the delivery pipe, wherein the end cap has a coupling groove to be fitted to the outer peripheral surfaces at both ends of the delivery pipe, And a filler material fitting groove is formed in the inner circumferential surface of the groove so that the filler material is inserted.

The filler-material fitting groove is formed to a depth larger than the thickness of the filler material. After the filler material is fitted into the filler-material fitting groove, the filler material protrudes from the inner circumferential surface of the coupling groove, and the end cap is fitted to the outer peripheral surfaces at both ends of the delivery pipe It is preferable that the flexible material is configured so as to be prevented from being caught by the delivery pipe.

In addition, it is preferable that a threaded portion is formed on both the outer circumferential surface of the delivery pipe and the inner circumferential surface of the engagement groove of the end cap, and the end cap is screwed to both ends of the delivery pipe.

The filler material is formed in a ring shape and is formed to be larger than the inner diameter of the engaging groove. When the engaging groove is partially compressed to compress the engaging groove, the engaging groove is smaller than the inner diameter of the engaging groove. It is preferable to be formed so as to have elasticity.

According to another aspect of the present invention, there is provided a delivery pipe comprising: a delivery pipe having both ends penetrating and forming a flow path on the inside thereof and having a connection hole communicating with a flow path on an outer circumferential surface thereof; a socket coupled to the periphery of the connection hole, And an end cap having an engaging groove for engaging with both ends of the delivery pipe to close both ends of the pipe, wherein a sponge for fusing and fixing the end cap to the outer circumferential surface of the delivery pipe is formed on an outer circumferential surface of the end portion of the delivery pipe And a filler material fitting groove is formed to be fitted and joined.

In addition, the distance from the end of the delivery pipe to the filler-fitting groove may be smaller than the depth of the coupling groove so that the end cap completely covers the filler-fitting groove.

The end cap may be formed on the outer circumferential surface of the end portion of the delivery pipe such that the end cap and the outer circumferential surface of the delivery pipe have the same height after the end cap is fitted. It is preferable that a filler material fitting groove is formed in the stepped portion so that the filler material is fitted and joined.

According to the present invention, when the end cap, which is fitted in the filler fitting grooves formed on the inner circumferential surface of the end cap, is joined and fixed to the outer circumferential surfaces of the both ends of the delivery pipe, when the fuel pressure flowing on the inside of the delivery pipe is applied to the end cap, It is possible to prevent breakage or cracking of the end cap by being evenly dispersed inside the end cap.

1 is a perspective view showing a conventional fuel rail;
2 is a cross-sectional view showing a coupling structure of an end cap in the fuel rail of FIG. 1;
3 is a perspective view showing a state in which the end cap is separated from the fuel rail according to the first embodiment of the present invention.
Fig. 4 is a sectional view of Fig. 3; Fig.
5 is a cross-sectional view showing a state where the filler of the end cap is melted in the fuel rail of FIG. 3;
6 is a sectional view showing a fuel rail according to a second embodiment of the present invention;
7 is a cross-sectional view showing a state where the filler of the end cap is melted in the fuel rail of FIG. 6;
8 is a sectional view showing an end cap coupling structure in a fuel rail according to a third embodiment of the present invention;
9 is a sectional view showing an end cap coupling structure in a fuel rail according to a fourth embodiment of the present invention.
10 is a sectional view showing an end cap coupling structure in a fuel rail according to a fifth embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, the terms described below are terms defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, definitions of these terms should be made based on the contents throughout this specification.

FIG. 3 is a perspective view showing a state in which the end cap is separated from the fuel rail according to the first embodiment of the present invention, FIG. 4 is a sectional view of FIG. 3, And Fig. FIG. 6 is a cross-sectional view showing a fuel rail according to a second embodiment of the present invention, FIG. 7 is a cross-sectional view showing a state where the filler of the end cap is melted in the fuel rail of FIG. 6, 3 is a cross-sectional view showing an end cap coupling structure in a fuel rail according to an embodiment. FIG. 9 is a cross-sectional view showing an end cap coupling structure in a fuel rail according to a fourth embodiment of the present invention, and FIG. 10 is a sectional view showing an end cap coupling structure in a fuel rail according to a fifth embodiment of the present invention.

The fuel rail 100 includes a delivery pipe 110, an end cap 130 coupled to both ends of the delivery pipe 110, a delivery pipe 110, And a socket 120 coupled to an injector (not shown) that injects fuel.

The delivery pipe 110 is formed with a pipe-shaped member having a predetermined length through which both ends are passed. That is, the inside of the delivery pipe 110 serves as a flow path through which the fuel flows. The delivery pipe 110 is formed with a plurality of connection holes through which the flow path of the inner space and the flow path of the socket 120 described later are connected to the outer circumferential portion. Here, the connection holes are preferably formed in the same number as the number of cylinders of the engine in which the fuel rail 100 is installed.

The socket 120 may be integrally formed on the outer circumferential surface of the delivery pipe 110 or may be separately formed and fixed to the outer circumferential surface of the delivery pipe 110. The socket 120 is connected to the injector and the delivery pipe 110 to form a flow path through which the fuel flows.

The end cap 130 is coupled to both ends of the opening of the delivery pipe 110 to close and close the opening of the delivery pipe 110 and is welded and fixed to both ends of the delivery pipe 110.

The end cap 130 is formed in the shape of a cup having one side portion opened and the opened portions are respectively fitted to both ends of the delivery pipe 110. That is, one end of the end cap 130 is inserted into the outer circumferential surface of both ends of the delivery pipe 110. Accordingly, the end cap 130 has a coupling groove 131 into which the both ends of the delivery pipe 110 are fitted.

The coupling groove 131 of the end cap 130 is formed to have an inner diameter larger than the outer diameters of both ends of the delivery pipe 110 so that the outer peripheral surfaces of the delivery pipes 110 can be inserted and fitted.

In order to completely fix the end cap 130 at both ends of the delivery pipe 110 by using the filler material 140 in the coupling groove 131 of the end cap 130, the filler material 140 is inserted into the end cap 130 A filler material fitting groove 131a for temporary fixing is formed. The filler fitting groove 131a is used to completely fix the end cap 130 to the delivery pipe 110, that is, to perform the operation of passing the delivery pipe 110 through the brazing furnace to melt the filler material 140 And is formed close to the inlet of the engaging groove 131 so that the fixed area of the delivery pipe 110 and the end cap 130 fixed by the molten consumable material is maximized.

Since the end cap 130 is coupled to the outer circumferential surfaces of both ends of the delivery pipe 110 in a state where the spark plug 140 is fitted in the spark plug fitting groove 131a, the spark plug 140 inserted into the consumable material fitting groove 131a, It is preferable that the thickness of the filler material 140 is smaller than the depth of the filler material fitting groove 131a so as not to protrude from the inner circumferential surface of the coupling groove 131 of the end cap 130. [

The filler material 140 is formed to have a diameter D3 larger than the inner diameter D1 of the coupling groove 131 so as to be fitted into the filler material fitting groove 131a after being inserted into the coupling groove 131 of the end cap 130, Is smaller than the inner diameter (D2) of the filler material fitting groove (131a), and is formed in a ring shape with a part thereof opened, and is made of a material having an elastic force.

That is, the filler material 140 is first pressed to hold the filler material 140 by the operator in order to insert the filler material 140 into the coupling groove 131 of the end cap 130, The diameter D3 is smaller than the inner diameter D1 of the coupling groove 131 and fitted into the coupling groove 131 of the end cap 130. [ Then, when the filler material 140 fitted in the coupling groove 131 is pushed inward, the filler material 140 is fitted into the filler material fitting groove 131a. At this time, the filler material 140 is restored to its original state by the elastic force, and is completely located in the filler material fitting groove 131a.

3 to 4, the delivery pipe 110 may have inclined surfaces 110a at both ends thereof. This is because after the end cap 140 of the delivery pipe 110 is fitted and joined together with the filler 140 inserted into the filler material fitting groove 131a of the end cap 130 is melted in the brazing furnace, And flows between the outer peripheral surface and the inner peripheral surface of the end cap 130 to flow between the end of the delivery pipe 110 and the bottom surface of the coupling groove 131 of the end cap 130 to improve the fixing strength of the end cap 130 It is for this reason.

When the end cap 130 is coupled to both ends of the delivery pipe 110, the end cap 130 is configured to be screwed as shown in FIG. That is, the end cap 131 and the end cap 130 may be screwed to both ends of the delivery pipe 110 by forming threads on the outer circumferential surfaces of the end pipes of the end cap 130 and the delivery pipe 110, respectively.

The end cap coupling portion 111 formed at both ends of the outer circumferential surface of the delivery pipe 110 coupled to the end cap 130 is formed to have a diameter smaller than the diameter of the delivery pipe 110 as shown in FIGS. The end cap of the delivery pipe 110 and the outer diameter of the end cap 130 coupled to the end cap coupling portion 111 are made equal to each other by joining the end cap 130 to the end cap coupling portion 111 So as to improve the appearance of the product.

9 and 10 are sectional views showing fuel rails according to fourth and fifth embodiments of the present invention.

The fuel rail 100 according to the fourth and fifth embodiments of the present invention is characterized in that the end cap coupling portion 111 is formed on the outer peripheral surface of the end portion of the delivery pipe 110 and the ring cap The end caps 130 are fitted to the outer circumferential surface of the end cap engaging portion 111 after the engaging member 140 of the end caps is engaged.

First, the fuel rail 100 of the fourth embodiment of the present invention forms a filler-fitting groove 141, which is a filler material coupling portion, for coupling the filler material 140 to the outer peripheral surface of the end portion of the delivery pipe 110.

After joining the filler material 130 in the ring-shaped fitting groove 141 with the filler material 130, the end cap 140 is engaged with the end cap coupling portion 111 where the filler material 130 is fitted.

The filler material fitting groove 141 must be obscured by the end cap 130 when the end cap 130 is coupled to the end cap engagement portion 111 so that at the end of the delivery pipe 110, (d1) should be smaller than the depth (d2) of the coupling groove (131) of the end cap (130). The filler material fitting groove 141 is formed at a certain depth toward the center of the inside of the delivery pipe 110.

The fuel rail according to the fifth embodiment of the present invention includes an end cap coupling portion 111 to which the end cap 130 is coupled to the outer peripheral surface of the end portion of the delivery pipe 110, The end cap outer diameter of the delivery pipe 110 is made small so that the end cap peripheral surface of the end cap 130 is the same as the outer peripheral surface of the delivery pipe 110 to form the end cap coupling portion 111.

A step 112 is formed on an outer circumferential surface of the end cap coupling portion 111 formed on the delivery pipe 110 and the delivery pipe 110 and a ring shaped filler material 140 is inserted into the step 112, A filler material fitting groove 141 is formed. The filler material fitting groove 141 is formed at a predetermined depth toward the opposite end of the delivery pipe 110 in the longitudinal direction of the delivery pipe 110 when the filler material fitting groove 141 is formed in the stepped portion 112.

The operation of the fuel rail according to an embodiment of the present invention having the above-described structure will be briefly described.

The delivery pipe 110, the socket 120, the end cap 130 and the filler material 140 which are components of the fuel rail 100 are prepared and prepared.

A filler material fitting groove 131a is formed inside the coupling groove 131 of the end cap 130 when the end cap 130 is manufactured.

Hereinafter, a process of assembling the components of the fuel rail 100 will be briefly described.

The filler material 140 is inserted into the filler material fitting groove 131a formed on the inner circumferential surface of the coupling groove 131 by fitting the filler material 140 in the ring shape inside the coupling groove 131 of the end cap 130. [

Thereafter, the end caps are temporarily coupled to the outer peripheral surfaces of the delivery pipe at both ends by threaded engagement.

Thereafter, the delivery pipe 110, in which the end cap 130 and the filler material 140 are combined, is passed through the brazing furnace to completely fix the end cap 130 to the delivery pipe 110.

That is, when the delivery pipe 110 is passed through the brazing furnace, the filler material 140 is melted to be in a liquid state. Thereafter, the liquid filler material is mixed with the outer peripheral surface of the delivery pipe 110, As shown in FIG. Then, when the delivery pipe 110 goes out of the brazing furnace, it is cooled. At this time, the end cap is solidified and the end cap 130 is completely fixed to the delivery pipe 110.

The fuel rail 100 according to an embodiment of the present invention is assembled with the end cap of the delivery pipe 110 when the end cap 130 is coupled to the delivery pipe 110, The melted filler material seeps between the outer circumferential surface of the delivery pipe and the inner circumferential surface of the end cap so as to be cooled and thereby cooled. As a result, the fuel pressure flowing on the inner side of the delivery pipe 110 can be reduced, It is possible to prevent the cap 130 from being damaged or cracked.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It is understandable. Accordingly, the true scope of the present invention should be determined by the following claims.

100: fuel rail
110: Delivery pipe 111: End cap coupling part
120: Socket
130: End cap 131: Coupling groove
140: Ingredient
141: Grout filler groove

Claims (7)

A delivery pipe through which both ends are passed, a flow path is formed on the inner side, and a connection hole communicating with the flow path is formed on the outer peripheral surface;
A socket coupled to the periphery of the connection hole for coupling the injector;
And an end cap coupled to both ends of the delivery pipe to close both ends of the delivery pipe,
Wherein the end cap has an engagement groove that is fitted in the outer peripheral surfaces at both ends of the delivery pipe,
And a filler material fitting groove is formed in the inner circumferential surface of the coupling groove so as to fit the filler material. The method according to claim 1,
Wherein said filler-
Wherein the filler material is formed to have a depth larger than the thickness of the filler material so that the filler material is protruded from the inner circumferential surface of the engaging groove after the filler material is fitted into the filler material fitting groove and the end cap is fitted to the outer peripheral surfaces at both ends of the delivery pipe, Wherein the fuel rail is configured to be prevented from being caught by the pipe. The method according to claim 1,
Wherein the end cap has a threaded portion formed on an outer circumferential surface of both ends of the delivery pipe and an engagement groove of the end cap, and the end cap is screwed to both ends of the delivery pipe. The method according to claim 1,
The above-
And is formed to be larger than the inner diameter of the coupling groove, and is formed with elasticity so as to return to the original state when the pressing is released after the part is opened to be smaller than the inner diameter of the coupling groove while being compressed when the coupling groove is pressed Wherein the fuel rail has a high strength assembly structure. A delivery pipe through which both ends are passed, a flow path is formed on the inner side, and a connection hole communicating with the flow path is formed on the outer peripheral surface;
A socket coupled to the periphery of the connection hole for coupling the injector;
And an end cap having an engaging groove to be engaged with both ends of the delivery pipe to close both ends of the delivery pipe,
Wherein a fuel filler groove is formed in an outer circumferential surface of the end portion of the delivery pipe, wherein a filler material groove is formed in which a filler for fusing and fixing the end cap to the outer circumferential surface of the delivery pipe is inserted. 6. The method of claim 5,
Wherein a distance from the end of the delivery pipe to the fusible member fitting groove is smaller than a depth of the fitting groove so that the end cap completely covers the fusible member fitting groove. 6. The method of claim 5,
Wherein an end portion of the delivery pipe is fitted with an end cap so that the end cap and the delivery pipe have the same height after the end cap is fitted, And a filler material fitting groove into which the excipient is fitted is formed.


KR1020150157702A 2015-11-10 2015-11-10 Fuel rail having high intensity assembling structure KR20170054931A (en)

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KR1020150157702A KR20170054931A (en) 2015-11-10 2015-11-10 Fuel rail having high intensity assembling structure

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Application Number Priority Date Filing Date Title
KR1020150157702A KR20170054931A (en) 2015-11-10 2015-11-10 Fuel rail having high intensity assembling structure

Publications (1)

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KR20170054931A true KR20170054931A (en) 2017-05-18

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