JP2007162503A - Fuel delivery pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel delivery pipe capable of reducing generation/transmission/propagation/radiation of radiation sound in a high frequency range while absorbing fuel pressure pulsation from an absorb wall surface and preventing stress concentration in tension direction on the absorb wall surface when inner pressure is applied. <P>SOLUTION: A communication pipe 1 provided with the absorb wall surface 3 is formed by a wide width outside wall 4 having a communication opening for connecting a socket 15 is formed thereon, an inside wall 5 opposing to the outside wall 4 and a narrow width both side walls 6 connecting the outside wall 4 and the inside wall 5 as one body. Then, one or a plurality of bridging members 10 forming a folding part 11 and/or a bending part 20 and provided with a bulge part 12 at a longitudinal direction center part in a direction crossing an axial direction of the inside wall 5 with projecting the bulge part 12 outward are arranged on a surface of the inside wall 5 of the communication pipe 1. Width direction both end parts of the communication pipe 1 of the bridging member 10 are continuously fixed on the surface of the inside wall 5 and an interval is provided between the bulge part 12 and the inside wall 5. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a fuel for supplying fuel supplied from a fuel pressurizing pump of an automobile engine to a fuel injector (injection nozzle) that injects fuel into each intake passage of the engine or directly into a cylinder. It relates to the improvement of the delivery pipe.

  2. Description of the Related Art Conventionally, there is known a fuel delivery pipe that is provided with a plurality of injectors and supplies fuel such as gasoline to a plurality of cylinders of an engine. This fuel delivery pipe injects fuel supplied from a fuel tank via an underfloor pipe into a plurality of intake pipes or cylinders of an engine sequentially from a plurality of injectors, and mixes this fuel with air. The engine output is generated by burning the fuel.

  The fuel delivery pipe has a return type that has a circuit for returning the excess fuel to the fuel tank by a pressure regulator when excess fuel is supplied from the fuel tank, and returns the excess fuel to the fuel tank. There is a returnless type that does not have a circuit. Recently, a returnless type fuel delivery pipe is often used for the purpose of reducing the cost and preventing the gasoline temperature in the fuel tank from rising.

  This returnless type fuel delivery pipe has no piping to return excess fuel to the fuel tank, so if the inside of the fuel delivery pipe is depressurized by the fuel injection from the injector to the engine or the cylinder, The pressure wave generated by the reduced pressure and the stop of fuel injection causes pressure pulsation inside the fuel delivery pipe. This pressure pulsation is propagated as noise in the vehicle, and this noise causes discomfort to the driver and the passenger. Therefore, in order to reduce the pressure pulsation, Patent Document 1 and FIGS. 13 (a) and 13 (b) As shown, a fuel delivery pipe having a pulsation absorbing function capable of absorbing pressure pulsations has been proposed.

  In the fuel delivery pipe having the pressure pulsation absorbing function, a flexible absorber wall surface (50) is formed in the communication tube (53), and the absorber wall surface (50) is bent by receiving pressure generated by fuel injection. By deforming, pressure pulsation is absorbed and reduced, and generation of noise due to vibration of the fuel delivery pipe and other parts can be prevented.

  However, in the fuel delivery pipe shown in Patent Document 1 and FIGS. 13 (a) and 13 (b), when the flexibility of the absorber wall surface (50) is increased, the high frequency region generated when the spool of the injection nozzle is seated on the valve seat. Therefore, a larger high-frequency radiated sound is transmitted, propagated and radiated around the fuel delivery pipe. Therefore, as described in Patent Document 1 and FIGS. 13 (a) and 13 (b), in the fuel delivery pipe in which the communication pipe (53) is provided with the absorber wall surface (50), the problem of noise due to the radiated sound in this high frequency region occurs. It was.

Therefore, in the fuel delivery pipe having the absorption wall surface (50) in the communication pipe (53), in order to reduce the radiated sound in the high frequency range, as shown in Patent Document 2 and FIGS. 14 (a) and (b), the absorption wall surface ( 50), by fixing a flat plate material (60) in a direction crossing the length direction of the absorber wall surface (50), the rigidity of the absorber wall surface (50) is increased, and the high frequency radiated from the fuel delivery pipe is increased. 2. Description of the Related Art Fuel delivery pipes that reduce the noise in the region and reduce the pulsation pressure and shock wave of the fuel by bending the absorber wall surface (50) are known.
JP 2000-329031 A JP 2004-3422 A

  However, the fuel delivery pipe as shown in Patent Document 2 and FIGS. 14 (a) and 14 (b) is a boundary portion in the width direction of the communication pipe (53) between the absorber wall surface (50) and the plate material (60) when internal pressure is applied. Since stress concentration in the pulling direction occurs at (64), there is a risk of damage to the absorber wall surface (50) at this boundary (64).

  Therefore, in order to solve the above-described problems, the present invention can reduce generation, transmission, propagation, and radiation of high-frequency radiated sound while absorbing fuel pressure pulsation by the absorber wall surface, and at the time of adding internal pressure, It is intended to obtain a fuel delivery pipe that is less likely to cause stress concentration in the pulling direction on the absorber wall surface and that can prevent damage to the absorber wall surface.

  The present invention solves the above-described problems, and includes a wide external wall in which a communication port for connecting a socket is formed, a wide internal wall provided facing the external wall, and the external wall. And a narrow side wall connecting the inner wall and the inner wall together to form a communication pipe having an absorber wall surface, and forming a bent portion and / or a curved portion on the surface of the inner wall of the communication pipe. One or more bridge members with bulges at the center in the length direction are arranged in the direction intersecting the axial direction of the inner wall with the bulges protruding outwards. Both ends in the width direction of the communicating pipe of the member are connected and fixed to the surface of the inner wall, and a space is provided between the bulging portion and the inner wall.

  Further, the communication pipe is a pipe type of an integral structure, and in the vicinity of the center in the width direction of the inner wall, an inner wall central bent portion having a cross-sectional shape is formed inwardly and formed in the length direction. The outer wall at the position corresponding to the inner wall central bent portion may be formed by projecting the outer wall central bent portion having a cross-sectional shape outward in the length direction.

  The communication pipe is a monolithic pipe type, and a central flat portion having a constant width is formed in the length direction near the center in the width direction of the inner wall, and both sides of the central flat portion are bent outward. The both side bent portions are formed in the length direction, and the outer wall central bent portion having a cross-sectional shape is formed outwardly in the length direction on the outer wall corresponding to the both side bent portions. It may be what you did.

  Further, the communication pipe may be formed by forming an outwardly bent portion in the length direction near the center in the width direction of at least one side wall.

  Further, the communication pipe is a pipe type having an integral structure, and may be formed in a flat and substantially rectangular parallelepiped shape.

  Further, the communication pipe may be in the form of a matching box with the upper and lower parts divided and formed in a flat, substantially rectangular parallelepiped shape.

  Further, the communication pipe may be an integral pipe type in which a substantially U-shaped groove is formed in the longitudinal direction at the center in the width direction of the inner wall.

  Further, the communication pipe may be in the form of a matching box divided into upper and lower parts, and a substantially U-shaped concave groove may be formed in the length direction at the center in the width direction of the inner wall.

  Moreover, the bridge member may be provided with a flat portion at the center of the bulging portion.

  Moreover, the bridge member may be provided with one or a plurality of curved portions in the central portion of the bulging portion.

  Further, the bridge member may be formed by forming flat connection portions at both ends of the bulging portion and bringing the connection portion into surface contact with the surface of the inner wall of the communication pipe and connecting and fixing the inner wall. .

  Further, the bridge member may be formed by extending the connecting portion into an annular shape and closely contacting the connecting portion with the outer peripheral surface of the communication pipe.

  Further, the communication pipe may be one in which an auxiliary member having an L-shaped cross section is tightly fixed from the side wall corresponding to the fixing position of the bridge member to the outer wall.

  The present invention is configured as described above, and an absorber wall surface is formed on the communication pipe, and a bridge member is fixedly disposed on the absorber wall surface, thereby absorbing fuel pressure pulsation by the absorber wall surface and high frequency. The generation, transmission, propagation, and radiation of the radiated sound in the region can be reduced, and the bent part and / or the curved part are formed in the bridge member to provide the bent part and Since the curved portion absorbs the stress in the pulling direction of the absorber wall surface generated when the internal pressure is applied and makes it difficult for stress concentration to occur, the absorber wall surface can be prevented from being damaged.

  Embodiment 1 of the present invention will be described with reference to FIGS. 1 and 2. (1) is a communication pipe having a fuel passage (2) therein, and is a pipe-type element pipe having an integral structure without a flap piece. Is deformed into a flat, substantially rectangular parallelepiped shape by pressing or the like from the outer surface to form a flat and flexible absorber wall surface (3), and this absorber wall surface (3) can absorb fuel pressure pulsation. . In the first embodiment, the communication pipe (1) is formed using a pipe-type element pipe having an integral structure. However, in other different embodiments, two cross-sectionally U-shaped or L-shaped cross-sections are used. The member (1) may be integrally formed by press-molding the members, bringing the end faces together, and laser welding, brazing, or the like.

  The communication pipe (1) includes a wide outer wall (4), an inner wall (5) of the same width arranged opposite to the outer wall (4), an outer wall (4) and an inner wall. (5) and the narrow side walls (6) that integrally connect to each other. And, in the vicinity of the center in the width direction of the inner wall (5), an inner wall central bent portion (7) having a cross-sectional shape is formed inwardly projecting in the length direction. In the vicinity of the center in the width direction of the outer wall (4) corresponding to (7), an outer wall central bent portion (8) having a square cross section is formed to protrude outward in the length direction.

  Then, on the surface of the inner wall (5) of the communication pipe (1), as shown in FIG. 1 (a), there is one bridge member (10) at the center in the length direction of the inner wall (5). Fixed placement. This bridge member (10) is a bulging portion provided with a flat portion (9) in the center in the length direction by bending a rectangular plate material in the width direction to form a plurality of bent portions (11). (12) is formed. Moreover, the flat connection part (13) is formed in the both ends of this bulging part (12). As shown in FIGS. 1 and 2, with the bulging portion (12) protruding outward, the bridge member (10) is placed on the surface of the inner wall (5) and the inner wall (5) It is arranged in the vertical direction that is the direction intersecting the axial direction, and the connection portion (13) of the bridge member (10) is brought into surface contact with the surface of the inner wall (5) to be connected and fixed. Thereby, as shown in FIG.1 (b) and FIG. 2, a space | interval is formed between the surface of an internal wall (5), and a bridge member (10).

  As described above, the bending of the internal wall (5) which is the absorber wall surface (3) is slightly suppressed by fixing and arranging the bridge member (10) on the surface of the internal wall (5) of the communication pipe (1). Therefore, amplification of radiated sound in the high frequency range is suppressed, and generation, transmission, propagation, and radiation of the radiated sound in the high frequency range can be reduced. Further, since the bridge member (10) is provided with a bent portion (11), the bent portion (11) suppresses deformation of the absorber wall surface (3). The strain in the tensile direction generated in the portion covered with the bridge member (10) of (7) is reduced. For this reason, it is possible to make it difficult for stress concentration to occur at a certain point on the wall surface (3) of the absorber, and the strain in the pulling direction of the other central wall bent portion (7) not covered by the bridge member (10). Can also be reduced at the same time, and damage to the absorber wall surface (3) can be prevented.

  And in order to confirm the effect of this invention, about the maximum stress value of the inner wall (5) at the time of internal pressure addition, it compares with the present Example 1 and the comparative examples 1 and 2 shown in FIG.13 and FIG.14 as a prior art example. The experiment was conducted. In this comparative experiment, a stress value (maximum principal stress), which is an internal pressure deformation analysis result, is derived by FEM (Finit Element Method). Therefore, in performing this FEM analysis, the present Example 1 and Comparative Examples 1 and 2 share the same shape, size, etc., and the conditions are as follows.

  First, in order to make the communicating pipe (53) of Comparative Examples 1 and 2 the same shape as the communicating pipe (1) of Example 1, as shown in FIGS. 13 and 14, a wide outer wall (54) and an inner wall are provided. (55), and a narrow side wall (56) integrally connecting the outer wall (54) and the inner wall (55), and the inner wall (55) has a central inner wall bend. The part (57) is formed in the length direction of the outer wall (54) and the outer wall central bent part (58) is formed in the length direction. Further, as shown in FIG. 14 (b), a flat plate material (60) having a thickness of 2.3 mm is formed on the inner wall (55) of the communication pipe (53) of Comparative Example 2, and the inner wall (55). At the center in the length direction, the inner wall (55) is fixed in close contact with the axial direction.

  And the formation width of the communication pipes (1) and (53) of the present Example 1 and Comparative Examples 1 and 2 is set so that the inner wall central bent part (7) (57) and the outer wall central bent part (8) ( 58) is 31.0 mm, the formation length is 266 mm, the formation height is 21.3 mm, and the thickness of these communicating pipes (1) and (53) is 1.0 mm. Further, the formation width between the surfaces of the inner walls (5) and (55) of the communication pipes (1) and (53) and the surfaces of the outer walls (4) and (54) is set to 10.5 mm, and the communication pipe (1 ) (53) are fixed to both ends with flat caps (14) and (61) having a thickness of 1.2 mm.

  The communication pipes (1) (53) communicate with the outer walls (4) (54) of the communication pipes (1) (53) at positions of 40 mm and 120 mm from the center in the length direction to both ends. A total of four sockets (15) and (62) with a diameter of 16 mm connected through the mouth are formed. Further, on one side of the communication pipes (1) and (53), a pair of locking tools (16) and (63) is provided at a position of 86.0 mm from the center in the longitudinal direction of the communication pipes (1) and (53) to both sides. ) Protrudes and is fixed in a direction perpendicular to the axial direction of the communication pipes (1) and (53). Further, the thickness of the bridge member (10) fixedly arranged on the inner wall (5) of the first embodiment is set to 1.2 mm, and the flat portion (9) and the connection portion ( The formation width of 13) is 5 mm.

  And as a result of performing FEM analysis about the present Example 1 and Comparative Examples 1 and 2 formed as described above, when the maximum stress value generated in the inner wall central bent portion (57) of Comparative Example 1 is used as a reference, The maximum stress value generated in the inner wall central bent portion (57) of Comparative Example 2 was increased by 93%, whereas the maximum stress value generated in the inner wall central bent portion (7) of Example 1 was increased. Only increased by 25%. From this result, as shown in the first embodiment, when the bridge member (10) is fixedly arranged on the inner wall (5) of the communication pipe (1), the bent portion (11) of the bridge member (10) is obtained. However, in order to suppress deformation of the inner wall central bent portion (7) of the absorber wall surface (3) with elastic deformation in the portion covered with the bridge member (10), the inner wall central bent portion (7) The strain in the tensile direction that occurs is reduced. As a result, it was confirmed that the maximum stress value generated in the above-mentioned absorber wall surface (3) can be reduced.

  In the first embodiment, only the bridge member (10) is fixedly arranged on the communication pipe (1). However, in the second embodiment of the present invention, as shown in FIGS. The bridge member (10) is fixedly disposed on the pipe (1) and, as shown in FIG. 4, the connecting pipe (1) is extended in the extending direction of the connecting portions (13) formed at both ends of the bridge member (10). A pair of L-shaped auxiliary members (17) having a L-shaped cross section are fixed in close contact from the side wall (6) to the outer wall (4). Since the auxiliary member (17) is fixedly disposed on the communication pipe (1) in this way, the bending of the inner wall (5), which is the absorber wall surface (3), is somewhat suppressed, so that the generation of radiated sound in the high frequency range Transmission, propagation, and radiation can be reduced.

  And also about this Example 2, as a result of performing FEM analysis similarly to the said Example 1, with respect to the maximum stress value which generate | occur | produces in the inner wall center bending part (57) of the said Comparative Example 1, Example 2 is shown. The maximum stress value generated in the inner wall central bent portion (7) was the same. From this result, when the bridge member (10) is fixedly arranged on the communication pipe (1) and the auxiliary member (17) is fixedly fixed, the bridge member (10) is not fixedly arranged on the communication pipe (1). It became clear that the maximum stress value generated in the inner wall central bent portion (7) can be obtained. For this reason, the bent portion (11) of the bridge member (10) suppresses deformation of the absorber wall surface (3) in the portion of the inner wall central bent portion (7) covered with the bridge member (10). The strain in the tensile direction generated in the portion of the inner wall central bent portion (7) covered with the bridging member (10) is reduced, and the maximum stress value generated in the above-mentioned absorber wall surface (3) can be reduced. Was confirmed. Accordingly, it is possible to make it difficult for stress concentration to occur at a certain point on the wall surface (3) of the absorber, and the distortion in the pulling direction of the other central wall bent portion (7) not covered by the bridge member (10). At the same time, also in the second embodiment, it is possible to prevent damage to the absorber wall surface (3) due to stress concentration in the pulling direction.

  In the second embodiment, a pair of L-shaped auxiliary members (17) are closely fixed to two locations via the bridge member (10) of the communication pipe (1). In the example, it is possible to provide the auxiliary member (17) only at one location of the communication pipe (1).

  Moreover, in the said Example 1 and 2, although the connection part (13) provided in the both ends of the bridge member (10) was closely_contact | adhered and fixed only to the inner wall (5), in Example 3 of this invention, The connecting portion (13) is extended from that of the first and second embodiments, and the bridge member (10) is disposed on the surface of the inner wall (5) as shown in FIGS. The connecting portion (13) is brought into close contact with the inner wall (5) and both side walls (6), and both ends of the connecting portion (13) are fixedly arranged on the surface of the outer wall (4). Since the bridge member (10) is fixedly arranged on the communication pipe (1) in this way, the bending of the inner wall (5), which is the absorber wall surface (3), is slightly suppressed, so that the generation of radiated sound in the high frequency range is generated.・ Transmission / propagation / radiation can be reduced. Moreover, in order for the bending part (11) of the bridge member (10) to suppress a deformation | transformation of the absorber wall surface (3) in the part coat | covered with the bridge member (10) of the inner wall center bending part (7). The maximum stress value generated in the absorber wall surface (3) can be reduced. Therefore, it is possible to make it difficult for stress concentration to occur at a certain location on the absorber wall surface (3), and the strain in the pulling direction of the other central wall bent portion (7) not covered by the bridge member (10). Can also be reduced at the same time, and damage to the absorber wall surface (3) can be prevented.

  Moreover, in the said Example 3, the connection part (13) of a bridge member (10) is extended, and this connection part (13) is made into the internal wall (5) of a communicating pipe (1), both side walls (6), and While closely contacting the outer wall (4), both ends of the connecting portion (13) are fixedly arranged on both sides of the outer wall (4). In the fourth embodiment of the present invention, the connecting portion (13) is connected to the outer wall (4). As shown in FIGS. 6 (a) and 6 (b), the connecting portion (13) is connected to the inner wall (5), both side walls (6), and the outer wall (4) as a whole. In addition, both ends of the connecting portion (13) are connected and fixed. By closely fixing the connecting portion (13) in this way, the bridge member (10) is fixed in an annular shape to the communication pipe (1), so that the bending of the absorber wall surface (3) is somewhat suppressed. The bending of the inner wall (5), which is the absorber wall surface (3), is somewhat suppressed, and generation, transmission, propagation, and radiation of high-frequency sound can be further reduced.

  In the first to fourth embodiments, the bridge member (10) is formed in a long plate shape and fixedly disposed on the communication pipe (1). However, in the fifth embodiment of the present invention, the bridge member is provided. (10) is formed in an annular shape. As shown in FIGS. 7 (a) and 7 (b), the bridge member (10) forms a bent portion (11) to provide a bulge portion (12), and the bulge portion (12). The flat connection part (13) is formed in both ends of. And the bulging part (12) of the bridge member (10) thus formed is arranged on the inner wall (5), and the connecting part (13) is connected to the inner wall (5) of the communication pipe (1), both side walls. (6) and the outer wall (4) are continuously and closely fixed in an annular shape. Since the bridge member (10) is formed in an annular shape and is brought into close contact with the communication pipe (1), the bending of the absorber wall surface (3) is slightly suppressed. Propagation / radiation can be further reduced.

  In the first to fifth embodiments, both side walls (6) of the communication pipe (1) are formed flat. However, in the sixth embodiment of the present invention, as shown in FIGS. An outwardly bent portion (18) is formed in the length direction at the center in the width direction of both side walls (6) of the pipe (1). In this way, by forming the outward bent portions (18) on the both side walls (6), the deformation of the outer wall (4) accompanying the deformation of the inner wall (5) causes the socket (15) and the outer wall ( 4) It is possible to reduce the stress in the pulling direction generated in the socket connecting portion (24).

Further, one bending portion (20) is formed in the central portion of the bridge member (10) provided on the inner wall (5), and this bending portion (20) is an absorber wall surface ( In order to suppress the deformation of 3), the maximum stress value generated in the absorber wall surface (3) can be reduced. For this reason, it is possible to make it difficult for stress concentration to occur at a certain location in the absorber wall surface (3), and it is possible to prevent damage to the absorber wall surface (3).

  Moreover, in the said Examples 1-6, the inner wall center bending part (7) of a cross-sectional square shape protrudes inward in the width direction center vicinity of the inner wall (5) of a communicating pipe (1), and is length. In the seventh embodiment of the present invention, the inner wall central bent portion (7) as described above is not formed on the inner wall (5), but the inner wall central bent portion (7) is formed as shown in FIGS. As described above, a central flat portion (21) having a constant width is formed in the length direction near the center in the width direction of the inner wall (5). Thus, by forming the central flat portion (21) on the inner wall (5) which is the absorber wall surface (3), the rigidity of the inner wall (5) is somewhat increased, so that the inner wall (5) is bent. Since it is slightly suppressed, generation, transmission, propagation, and radiation of high-frequency radiated sound can be further reduced.

  Moreover, in the said Example 7, although one curved part (20) is formed in the center part of the bulging part (12) of a bridge member (10), in this Example 7, it shows in FIG.9 (b). As described above, three curved portions (20) are formed at the center of the bulging portion (12). Therefore, since the curved portion (20) suppresses deformation of the absorber wall surface (3) when an internal pressure is applied, the maximum stress value generated on the absorber wall surface (3) can be reduced, and the absorber due to stress concentration can be reduced. Damage to the wall surface (3) can be prevented.

  Moreover, in the said Examples 1-7, while forming an internal wall center bending part (7) or a center flat part (21) in the internal wall (5) of a communicating pipe (1), an external wall (4) is externally provided. Although the wall central bent portion (8) is formed, in the eighth embodiment of the present invention, as shown in FIGS. 10 (a) and 10 (b), the communication is formed by deforming a pipe-type element tube having an integral structure. The outer wall (4) and the inner wall (5) of the pipe (1) are provided with the inner wall central bent portion (7), the central flat portion (21), the outer wall central bent portion (8) and the like as described above. It is flat without being formed, and the entire shape is a flat, substantially rectangular parallelepiped.

  A bridge member (10) is fixedly arranged at the center of the inner wall (5) of the communication pipe (1), and the center of the bridge member (10) in the longitudinal direction is shown in FIG. As shown in b), the bulging portion (12) provided with the flat portion (9) is formed by forming the bent portion (11). And since this bending part (11) suppresses a deformation | transformation of the absorber wall surface (3) at the time of internal pressure addition, the maximum stress value which arises in this absorber wall surface (3) can be reduced. The damage of the absorber wall surface (3) due to the stress concentration can be prevented.

  Moreover, in the said Example 8, although the flat substantially rectangular parallelepiped communication pipe | tube (1) is formed by deform | transforming the pipe-type element pipe of an integral structure, in Example 9 of this invention, FIG. As shown in a) and (b), the communication pipe (1) having a substantially rectangular parallelepiped shape can be divided into upper and lower bodies (25) and a lower body (26) to form a combined box type.

  In the eighth embodiment, the shape of the communication pipe (1) is a flat, substantially rectangular parallelepiped. However, in the tenth embodiment of the present invention, as shown in FIGS. The pipe is deformed to form the communication pipe (1), and a substantially U-shaped concave groove (22) is formed in the longitudinal direction at the center in the width direction of the inner wall (5) of the communication pipe (1). In addition, the cross-sectional shape is a substantially goggle type. And the connection part (13) of the bridge member (10) is connected and fixed to both sides of the concave groove (22) to the inner wall (5).

  Moreover, the upper end of the bulging part (12) is formed flat in this bridge member (10) by forming the bending part (11). Therefore, since the bent portion (11) suppresses deformation of the absorber wall surface (3) when an internal pressure is applied, the maximum stress value generated in the absorber wall surface (3) can be reduced. Accordingly, it is possible to prevent damage to the absorber wall surface (3) due to stress concentration. In the tenth embodiment, the pipe (1) is formed by deforming a single-piece pipe-type raw pipe. However, in another different embodiment, the communication pipe (1) is divided in the vertical direction. It is also possible to form a combined box shape.

(a) The top view of a fuel delivery pipe which shows Example 1 of this invention. (b) AA line sectional view of (a). The enlarged view of FIG.1 (b). (a) The top view of the fuel delivery pipe which shows Example 2 of this invention. (b) BB sectional drawing of (a). The enlarged view of FIG.3 (b). (a) The top view of the fuel delivery pipe which shows Example 3 of this invention. (b) The CC sectional view taken on the line of (a). (a) The top view of the fuel delivery pipe which shows Example 4 of this invention. (b) The DD sectional view taken on the line of (a). (a) The top view of the fuel delivery pipe which shows Example 5 of this invention. (b) EE sectional view taken on the line of (a). (a) The top view of the fuel delivery pipe which shows Example 6 of this invention. (b) The FF sectional view taken on the line of (a). (a) The top view of a fuel delivery pipe which shows Example 7 of this invention. (b) GG sectional view of (a). (a) The top view of a fuel delivery pipe which shows Example 8 of this invention. (b) HH sectional view taken on the line (a). (a) The top view of the fuel delivery pipe which shows Example 9 of this invention. (b) The II sectional view taken on the line of (a). (a) The top view of a fuel delivery pipe which shows Example 10 of this invention. (b) JJ sectional view taken on the line of (a). (a) The top view of the fuel delivery pipe which shows the comparative example 1 which is a prior art example. (b) XX sectional drawing of (a). (a) The top view of the fuel delivery pipe which shows the comparative example 2 which is a prior art example. (b) The YY sectional view taken on the line of (a).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Communication pipe 3 Absorb wall surface 4 External wall 5 Internal wall 6 Side wall 7 Inner wall center bending part 8 Outer wall center bending part 9 Flat part 10 Bridge member 11 Bending part 12 Expansion part 13 Connection part 15 Socket 17 Auxiliary Member 18 Outward bending portion 20 Bending portion 21 Central flat portion 22 Concave groove

Claims (13)

  A wide external wall that forms a communication port for connecting a socket, a wide internal wall that faces the external wall, and both narrow side walls that integrally connect the external wall and the internal wall To form a communicating pipe having an absorber wall surface, forming a bent part and / or a curved part on the surface of the inner wall of the communicating pipe and providing a bulging part at the center in the longitudinal direction. One or a plurality of members are arranged in a direction intersecting the axial direction of the inner wall with the bulging portion protruding outward, and both ends in the width direction of the communication pipe of the bridge member are on the surface of the inner wall. A fuel delivery pipe characterized in that it is connected and fixed, and a space is provided between the bulging portion and the inner wall.   The communication pipe is a pipe type having an integral structure, and is formed in the length direction by projecting inwardly into the center wall in the width direction of the inner wall and projecting inward in the length direction. 2. The fuel delivery pipe according to claim 1, wherein an outer wall central bent portion having a square cross section is formed on the outer wall at a position corresponding to the central bent portion so as to protrude outward.   The communication pipe is a monolithic pipe type, in which a central flat portion with a constant width is formed in the length direction near the center in the width direction of the inner wall, and both sides of the central flat portion are bent outward. Both side bent parts are formed in the length direction, and the outer wall central bent part having a cross-sectional shape is formed in the length direction on the outer wall at a position corresponding to the both side bent parts. The fuel delivery pipe according to claim 1.   The fuel delivery pipe according to claim 1, 2 or 3, wherein the communication pipe is formed with an outwardly bent portion in the longitudinal direction near the center in the width direction of at least one side wall.   The fuel delivery pipe according to claim 1, wherein the communication pipe is a pipe type having an integral structure and is formed in a flat, substantially rectangular parallelepiped shape.   2. The fuel delivery pipe according to claim 1, wherein the communication pipe has a flattened rectangular parallelepiped shape in which upper and lower parts are divided.   2. The fuel delivery pipe according to claim 1, wherein the communication pipe is a pipe type of an integral structure, and a substantially U-shaped concave groove is formed in the longitudinal direction at a central portion in the width direction of the inner wall.   The fuel delivery pipe according to claim 1, wherein the communication pipe is in the form of a matching box divided into upper and lower parts, and a substantially U-shaped concave groove is formed in the longitudinal direction at the center part in the width direction of the inner wall.   The fuel delivery pipe according to claim 1, wherein the bridge member is provided with a flat portion at a center portion of the bulging portion.   The fuel delivery pipe according to claim 1, wherein the bridging member is provided with one or a plurality of curved portions at a central portion of the bulging portion.   The bridge member is characterized in that a flat connection portion is formed at both ends of the bulging portion, and the connection portion is brought into surface contact with the surface of the inner wall of the communication pipe and connected and fixed to the inner wall. , 9 or 10 fuel delivery pipes.   The fuel delivery pipe according to claim 11, wherein the bridge member is formed in an annular shape by extending a connection portion, and the connection portion is brought into close contact with the outer peripheral surface of the communication pipe.   2. The fuel delivery pipe according to claim 1, wherein the communication pipe has an L-shaped auxiliary member in close contact and fixed from the side wall corresponding to the fixing position of the bridge member to the external wall.

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