JP2006336490A - Fuel delivery pipe and manufacturing method of fuel delivery pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate manufacturing of a communication pipe and to provide a communication pipe with excellent sealability and layout property. <P>SOLUTION: This fuel delivery pipe comprises: the communication pipe 1 having a fuel passage therein; a fuel guide pipe 8 fixed to an end part or a side part of the communication pipe 1; and sockets 6 whose one ends are connected with the communication pipe 1 to communicate with the fuel passage and other ends are connected with rear ends of injection nozzles. An expanded part expanded inward and/or outward of the communication pipe 1 is integrally formed to be projected from one side 2 and/or the other side 4 at least at one portion by a hydraulic bulge method. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an improvement in a fuel delivery pipe for supplying fuel supplied from a fuel pressurizing pump of an electronic fuel injection type automobile engine via an injection nozzle that directly injects the fuel into each intake passage or cylinder of the engine. In particular, the present invention relates to a cross-sectional structure and an external structure of a communication pipe having a fuel passage.

  A fuel delivery pipe that supplies fuel such as gasoline to a plurality of cylinders of an engine by providing a plurality of injection nozzles is configured so that fuel supplied from a fuel tank is sequentially supplied from a plurality of injection nozzles to a plurality of intake pipes or cylinders of the engine. The fuel is mixed with air, and the mixture is burned to generate engine output.

  And in such a fuel delivery pipe, what formed the whole communicating pipe in the straight tube shape is generally used conventionally. However, when the entire communication pipe is formed in a straight tube shape, layout properties such as interference and contact with other engine components are problematic. Therefore, as shown in Patent Documents 1 to 4, fuel delivery pipes that prevent interference with other engine components or can secure a space for a tool have been conventionally known.

  First, in the invention described in Patent Document 1, a through hole penetrating in the vertical direction is formed at the center in the axial direction of the communication pipe, and a cylindrical bracket is inserted and fixed to the through hole. In addition, as another embodiment described in Patent Document 1, a notch is formed in a side portion of a communication pipe, and a cylindrical bracket is assembled and fixed to the notch. And it aims at minimizing the installation space of the bracket to a communicating pipe by assembling and fixing a bracket to a communicating pipe as mentioned above.

  Further, the invention described in Patent Document 2 cuts a part of a flat communication pipe into an arc shape by a breath machine and a cutting blade, and an arc-shaped lid body along a cross-sectional opening of the notch portion. By closing with, an arc-shaped recess is formed in the communication pipe. In this way, an arc-shaped recess is formed in the communication pipe, and a bracket for attaching to other engine components is provided in the recess so that the bracket can be attached to an engine block, a cylinder head, an intake manifold, etc. The purpose is to improve the layout by making it possible to avoid interference and contact between the tool and the communication pipe when attaching to the pipe.

  In the invention described in Patent Document 3, a communication pipe is constituted by a main body obtained by bending a thin plate into a U shape and a U-shaped side plate covering three side surfaces of the main body. Then, by forming a plurality of concave portions recessed in an arc shape on the side plate side of this communication pipe, and arranging other engine components in this concave portion, interference and contact with other engine components are prevented. The purpose is to improve layout by avoiding or providing space for tools and wiring.

In addition, the invention described in Patent Document 4 forms a communication pipe by connecting a plurality of mini-cases formed in a substantially flat shape with connecting pipes each having an elongated circular cross section, and the mini-case of this communication pipe. A socket for connecting the rear end of the injection nozzle is provided. As described above, by forming a connecting pipe with the mini case and the connecting pipe, a space is provided between the mini cases, avoiding interference and contact with other engine components, and securing a tool space. The purpose is to improve the layout.
JP 2001-289137 A JP 2003-129920 A JP 2003-184694 A JP 2003-239824 A

  However, in the invention described in Patent Document 1, since a through hole and a notch portion must be formed in the communication pipe, processing is troublesome and manufacturing is complicated. In addition, when assembling the bracket to the communication pipe processed in this way, it is necessary to ensure a sealing property at the brazed portion between the communication pipe and the bracket, and there is a concern about ensuring reliability against fuel leakage and the like. It was.

  Further, in the invention described in Patent Document 2, a cutout portion must be formed in the communication pipe, and it takes time to process the communication pipe, and the cutout portion and the cross-sectional opening of the cutout portion are covered. Therefore, it was necessary to ensure the sealing property of the brazed portion with the lid to be secured, and there was a fear of ensuring the reliability against fuel leakage and the like.

  Further, in the invention described in Patent Document 3, it is necessary to form an arc-shaped recess in the main body and side plate of the communication pipe, and it takes time to process the main body and the side plate, and the main body and the side plate are brazed. In addition, since this brazed portion is a long and continuous piece from one end to the other end of the communication pipe, it is difficult to ensure hermeticity and there is a concern about ensuring reliability against fuel leakage and the like.

  Further, in the invention described in Patent Document 4, since the communication pipe is formed by a plurality of mini cases and connection pipes, the number of processing steps and the number of parts are increased, and the manufacturing takes time and the manufacturing cost is high. It was a thing. In addition, since there are many brazing points, it is difficult to ensure the sealing property at the brazed part, and there is a concern about ensuring the reliability against fuel leakage and the like.

  It is an object of the present invention to provide a communication pipe that is easy in processing without requiring labor and that is excellent in hermeticity and layout.

  In order to solve the above-mentioned problems, the present invention provides a pipe-type communication pipe having an integral structure having a fuel passage therein, and a fuel introduction pipe fixed to an end portion or a side portion of the communication pipe. A fuel delivery pipe having one end connected to the communication pipe and connected to the fuel passage, and the other end connected to the rear end of the injection nozzle. The bulging part bulging outward and / or inside is integrally formed and protruded from one side and / or the other side.

  In addition, the second invention in which the above method is implemented is a pipe-type communication pipe having an integral structure having a fuel passage inside, a fuel introduction pipe fixed to an end portion or a side portion of the communication pipe, and one end communicating. In a fuel delivery pipe having a socket connected to a pipe and communicating with a fuel passage and having the other end connected to the rear end of an injection nozzle, the communication pipe is integrally formed by a hydraulic bulge method, and At least one bulging portion bulging outward or inward is provided on one side and / or the other side of the communication pipe.

  The communication pipe may be formed with one or a plurality of bulging portions, and a plurality of the communication pipes may be connected in the axial direction.

  Further, the communication pipe may be formed by using a pipe having a substantially circular cross section in the radial direction as a starting material.

  In addition, the communication pipe may be formed by using a pipe whose radial cross-sectional shape is a substantially oval or rectangular shape with corners curved in an arc as a starting material.

  Further, the communication pipe may have a cross-sectional shape in the radial direction that is substantially oval or rectangular with corners curved in an arc.

  In addition, the bulging portion may have a cross-sectional shape in the radial direction that is substantially oval or rectangular with curved corners.

  Further, the communication pipe may have a substantially circular cross section in the radial direction other than the bulging portion.

  The communication pipe may be provided with a socket and / or a bracket for attaching to the engine at the bulging portion.

  Further, the bulging portion may have a flat mounting surface for the socket and / or mounting surface for the bracket.

  In addition, the communication pipe forms an outer bulging portion bulging outward on one side and an inner bulging portion bulging inward on the other side corresponding to the bulging portion. May be.

  Further, the communication pipe may be provided with a bracket on the inner bulge portion side.

  Further, the communication pipe may be provided with a socket on the outer bulge portion and a bracket on the inner bulge portion side.

  The present invention is configured as described above, and by processing the communication pipe of the fuel delivery pipe by a hydraulic bulge method, the bulging portion bulging outward or inward is made into a pipe-type communication pipe with an integral structure. It is possible to integrally project. Therefore, in the conventional manufacturing method by press molding, it was necessary to braze the entire circumference of the overlapping portion of the communicating pipe formed by superimposing the upper and lower two parts press-molded by separate dies. By using a hydraulic bulge method instead of press forming, the communication pipe can be processed and configured into a plurality of members, and the members can be integrally formed without brazing each other. Therefore, it is possible to reduce the number of component parts and the number of processing steps, and it is possible to obtain a product that is easy to manufacture and inexpensive, and that has excellent sealing properties and can improve the reliability of the product against fuel leakage.

  A first embodiment of the present invention will be described with reference to FIGS. 1 and 2. (1) is a monolithic pipe-type communication pipe, and one side (2) of this communication pipe (1) is shown in FIG. As described above, two outer bulges (3) bulging outward are formed. Further, on the other side (4) opposite to the one side (2), an inner bulging portion (5) bulging inward is provided at a position corresponding to the formation position of the outer bulging portion (3). A place is formed. Further, the communication pipe (1) provided with the outer bulging portion (3) and the inner bulging portion (5) as described above has the outer bulging portion (3), the inner bulging portion (5), and the outer bulging portion. The cross-sectional shape in the radial direction of the straight pipe portion other than the protruding portion (3) and the inner bulging portion (5) is formed in a flat shape that is a substantially oval shape with the corner portions curved in an arc shape. Therefore, an absorber surface is formed on a part of the wall surface of the communication pipe (1), and the pulsation pressure of the fuel injected from the injection nozzle, a shock wave, and the like can be reduced by the deflection of the absorber surface.

  Further, the communication pipe (1) formed as described above is formed by a hydraulic bulge method using as a starting material an integrally structured pipe whose radial cross-sectional shape is a substantially oval shape with corners curved in an arc shape. Is. That is, a mold having an external shape of the communication pipe (1) to be formed is arranged outside the pipe, and a normal or high pressure liquid is fed into the pipe, and the outer bulging portion (3) and An outer bulge portion (3) and an inner bulge portion (5) were provided by sliding a mold corresponding to the inner bulge portion (5) perpendicularly to the axial direction of the communication pipe (1). The communication pipe (1) can be formed integrally. By using the hydraulic bulge method as described above, the communication pipe (1) having the complicated shape as described above can be easily processed and manufactured. In addition, since the communication pipe (1) can be formed as an integral structure, it is possible to reduce the number of components and the number of brazing points to ensure hermeticity. High product can be obtained.

  Further, in the portion other than the outer bulging portion (3) and the inner bulging portion (5) of the communication pipe (1), there are four injection nozzle connection sockets (6) from one end to the other end at a desired interval. ) Is connected. In addition, a lid (7) formed separately is fixedly disposed at one end and the other end of the communication pipe (1). In addition, a distal end portion of the fuel introduction pipe (8) is inserted and arranged at one end of the communication pipe (1) through the lid (7).

  In addition, two brackets (10) are arranged on the mounting surface side of the socket (6) on the other side (4) of the communication pipe (1) formed as described above. It is assembled so as to be located in the part (5). Therefore, as shown in FIG. 2, when the tool (11) for fastening the bolt or nut for attaching the bracket (10) to the communication pipe (1) is positioned on the bracket (10), the tool (11) The communication pipe (1) can be fastened and arranged without interfering with the other side (4) of the communication pipe (1). Therefore, even if the distance between the center of each socket (6) and the center of the bolt hole (16) of the bracket (10) is narrow, the tool (11) can be arranged, and the bracket (10) by the tool (11) can be arranged. ) Can be secured. Further, as described above, the entire communication pipe (1) is flattened, and the mounting surface of the bracket (10) on the inner bulging portion (5) side is flat. Therefore, the bracket (10) can be assembled to the communication pipe (1) in a stable state.

  Moreover, in the said Example 1, the bracket (10) is attached to the inner side bulging part (5) side of the other side (4) of the communicating pipe (1), and the tool (11) for attaching this bracket (10); Although interference with the communication pipe (1) can be avoided, in the second embodiment of the present invention, another engine configuration is provided on the inner bulging portion (5) side of the other side (4) of the communication pipe (1). The case where the component (14) is arrange | positioned is shown. Then, as shown in FIG. 3, by arranging the communication pipe (1) so that the protrusion (15) formed on the other engine component (14) is located in the inner bulge (5). The communication pipe (1) and the other engine components (14) do not interfere with each other, so that the layout can be improved.

  In the first embodiment, the bracket (10) is fixedly disposed on the side of the inner bulge portion (5) formed in the communication pipe (1), and the outer bulge portion (3) and the inner bulge portion (5). Although the socket (6) is fixedly disposed in the straight pipe portion other than the bracket, in the third embodiment of the present invention, the bracket (10) is fixedly disposed on the inner bulging portion (5) side as shown in FIG. One socket (6) is arranged for each outer bulging portion (3) in each outer bulging portion (3).

  In this manner, the bracket (10) is arranged on the inner bulging portion (5) side, and the bracket (10) is fastened to the engine block, the cylinder head, the intake manifold, or the like, whereby another engine component (14 ) Or the tool (11) and the communication pipe (1) can be arranged without interfering with each other. In the third embodiment, as in the first embodiment, since the mounting surface of the socket (6) of the outer bulge portion (3) is flat, the socket (6) is stably attached to the outer bulge portion (3). Can be assembled.

  In the first to third embodiments, the outer bulging portion (3) is formed on one side (2) of the communication pipe (1) and the inner bulging portion (5) is formed on the other side (4). However, in Example 4 of the present invention, as shown in FIG. 5, a plurality of outer bulges (3) are formed on one side (2) of the communication pipe (1), and the other side (4) is formed on the other side (4). The outer bulging portion (3) and the inner bulging portion (5) are not formed, but are linear. Further, as shown in FIG. 6, the cross-sectional shape in the radial direction of the portion other than the outer bulging portion (3) and the outer bulging portion (3) of the communication pipe (1) is substantially oval and is shown in FIG. As described above, one socket (6) is arranged in each outer bulge portion (3).

  As shown in FIGS. 5 and 6, brackets (10) are fixedly arranged in the space between the outer bulges (3), and the bracket (10) is thus fixed to the outer bulges (3). By fixedly arranging them at a mutual interval, as shown in FIGS. 5 and 6, it is possible to secure a space for the tool (11) for assembling the bracket (10) to the engine block or the like. Therefore, interference between the tool (11) or other engine component (14) and the communication pipe (1) can be avoided.

  Moreover, in the said Examples 1-4, the cross-sectional shape of radial direction makes the said communication pipe | tube (1) by forming the communication pipe | tube (1) from the substantially oval pipe which curved the corner | angular part in the arc shape. 1) The cross-sectional shape in the radial direction of the outer bulge portion (3) is a substantially oval shape with the corners curved in an arc shape. In the fifth embodiment, the cross-sectional shape in the radial direction is an arc shape in the corner portion. The communication pipe (1) is formed by a hydraulic bulge method using a rectangular pipe that is curved as a starting material. Therefore, in the fifth embodiment, as shown in FIG. 8, the cross-sectional shape in the radial direction of the outer bulge portion (3) and the straight pipe portion other than the outer bulge portion (3) is curved, and the corner portion is curved in an arc shape. It has a rectangular shape.

  Further, as shown in FIG. 7, the communication pipe (1) is formed to be short in the axial direction, and at one side (2) and one outer bulge portion (3) are formed at the other side ( In 4), one inner bulging portion (5) is formed at a position corresponding to the outer bulging portion (3). A plurality of communicating pipes (1) formed in this way are connected in the axial direction by connecting parts (12) to form a connecting connecting pipe (13), and a socket (6) is formed on the outer bulging part (3). ) Are arranged one by one.

  By connecting a plurality of short communication pipes (1) in this way, the coupling connection pipe (13) can be formed to a desired length. Further, since the outer bulging portion (3) and the inner bulging portion (5) are provided for each communication pipe (1), the interval between the outer bulging portions (3) of the coupling connecting pipe (13) A tool (11) for fastening the other engine component (14) or the bracket (10) by disposing another engine component (14) or the bracket (10) on the inner bulging portion (5). ) Can be avoided, and a product with high layout can be obtained.

  Moreover, in the said Examples 1-5, although the cross-sectional shape of radial direction forms the communicating pipe (1) by using the pipe which is a substantially oval shape or a rectangle which curved the corner | angular part in the arc as a starting material, this invention In Example 6, a pipe having a substantially circular cross section in the radial direction is used as a starting material, and a communication pipe (1) is formed by a hydraulic bulge method, and one side (2) of this communication pipe (1) is formed. Has a plurality of flat outer bulges (3). Therefore, in the sixth embodiment, as shown in FIG. 10, the cross-sectional shape in the radial direction of the straight pipe portion other than the outer bulge portion (3) of the communication pipe (1) is substantially circular, and the outer bulge portion ( The cross-sectional shape in the radial direction of 3) is substantially oval, and one socket (6) is disposed in each of the outer bulging portions (3) as shown in FIG.

  In this way, since the cross-sectional shape in the radial direction other than the outer bulge portion of the communication pipe (1) is substantially circular, a wider space can be provided in the interval between the outer bulge portions (3). In addition, it becomes possible to arrange other engine components (14) in the space between the outer bulge portions (3) without interfering with each other, and the layout can be further improved. Further, as shown in FIG. 10, the outer bulging portion (3) is flattened and the mounting surface of the socket (6) is flat. Therefore, the socket (6) can be assembled in a stable state to the outer bulging portion (3).

  In the first to fifth embodiments, unlike the sixth embodiment, the communication pipe (1) is formed with a pipe having a substantially elliptical shape or a rectangular shape having a cross section in the radial direction curved in an arc shape as a starting material. However, similarly to the sixth embodiment, the communication pipe (1) can be formed by using a pipe having a substantially circular cross section in the radial direction as a starting material. However, although the molding die and molding equipment are complicated, it is rather better to mold a pipe whose starting section is a substantially oval or rectangular shape with a radial cross section curved in an arc shape. It goes without saying that it can be done.

The top view by the side of the socket and bracket attachment side of a communicating pipe which shows Example 1 of this application. The partial enlarged view of the surface on the opposite side to the socket and bracket attachment surface of the communicating pipe of an Example. The elements on larger scale of the surface on the opposite side to the socket and bracket attachment surface of a communicating pipe which show Example 2 of this application. The top view by the side of the socket and bracket attachment surface of a communicating pipe which shows Example 3 of this application. The fragmentary perspective view of a fuel delivery pipe which shows Example 4 of this application. AA line sectional view of Drawing 5. The perspective view of a fuel delivery pipe which shows Example 5 of this application. BB sectional drawing of FIG. The fragmentary perspective view of a fuel delivery pipe which shows Example 6 of this application. CC sectional view taken on the line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Communication pipe 2 One side 3 Outer bulging part 4 Other side 5 Inner bulging part 6 Socket 8 Fuel introduction pipe 10 Bracket

Claims (16)

  A pipe-type communication pipe having an internal structure with a fuel passage, a fuel introduction pipe fixed to an end portion or a side portion of the communication pipe, one end connected to the communication pipe, and the other end communicating with the fuel passage In a method of manufacturing a fuel delivery pipe having a socket for connecting the rear end of the injection nozzle to the rear end of the injection pipe, a bulging portion bulging outside and / or inside the communication pipe by a hydraulic bulge method is Alternatively, a method for producing a fuel delivery pipe, wherein at least one part is integrally formed and protruded on the other side.   A pipe-type communication pipe having an internal structure with a fuel passage, a fuel introduction pipe fixed to an end portion or a side portion of the communication pipe, one end connected to the communication pipe, and the other end communicating with the fuel passage A fuel delivery pipe having a socket for connecting the rear end of the injection nozzle to the rear end of the injection nozzle, wherein the communication pipe is integrally formed by a hydraulic bulge method, and on one side and / or the other side of the communication pipe, Alternatively, a fuel delivery pipe having at least one bulging portion bulging inward.   2. The method for producing a fuel delivery pipe according to claim 1, wherein the communication pipe is formed with one or a plurality of bulging portions, and a plurality of the communication pipes are connected in the axial direction.   3. The fuel delivery pipe according to claim 2, wherein the communication pipe forms one or a plurality of bulging portions, and a plurality of the communication pipes are connected in the axial direction.   The method for producing a fuel delivery pipe according to claim 1 or 3, wherein the communication pipe is formed by using a pipe having a substantially circular cross section in the radial direction as a starting material.   The fuel delivery pipe according to claim 1 or 3, wherein the communication pipe is formed by using a pipe whose radial cross-sectional shape is a substantially oval shape or a rectangular shape whose corners are curved in an arc shape as a starting material. Manufacturing method.   The fuel delivery pipe according to claim 2 or 4, wherein the communication pipe has a cross-sectional shape in a radial direction that is substantially oval or rectangular with corners curved in an arc shape.   7. The method for producing a fuel delivery pipe according to claim 1, wherein the bulging portion has a cross-sectional shape in a radial direction that is a substantially oval shape or a rectangular shape with curved corner portions.   The fuel delivery pipe according to claim 2, 4, or 7, wherein the bulging portion has a cross-sectional shape in a radial direction that is substantially oval or rectangular with curved corners.   The fuel delivery pipe according to claim 2, 4, 7, or 9, wherein the communicating pipe has a substantially circular cross-sectional shape other than the bulging portion.   11. The fuel delivery pipe according to claim 2, 4, 7, 9 or 10, wherein the communication pipe is provided with a socket and / or a bracket for attaching to the engine at the bulging portion.   12. The fuel delivery pipe according to claim 11, wherein the bulging portion has a flat mounting surface of the socket and / or mounting surface of the bracket.   The communication pipe is characterized in that an outer bulging portion bulging outward is formed on one side and an inner bulging portion bulging inward is formed on the other side corresponding to the bulging portion. A method for producing the fuel delivery pipe according to claim 1.   The communication pipe is characterized in that an outer bulging portion bulging outward is formed on one side and an inner bulging portion bulging inward is formed on the other side corresponding to the bulging portion. The fuel delivery pipe according to claim 2.   15. The fuel delivery pipe according to claim 14, wherein the communication pipe is provided with a bracket on the inner bulge portion side.   16. The fuel delivery pipe according to claim 14, wherein the communication pipe is provided with a socket on the outer bulge portion and a bracket on the inner bulge portion side.

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