JP4199709B2 - Fuel delivery pipe - Google Patents

Description

The present invention relates to a fuel delivery pipe for supplying fuel supplied from a fuel pressurizing pump of an electronic fuel injection type automobile engine into an intake pipe or cylinder of the engine via an injector. for tubular joints for connecting, deformation due to stress concentration due to internal pressure at the time of fuel flow to smaller portions to enable smooth fuel supply is for the purpose of improving the durability of the fuel deliverable Lipa type.

  2. Description of the Related Art Conventionally, a fuel delivery pipe is known in which a plurality of injectors are provided and fuel such as gasoline is supplied into a plurality of intake pipes and cylinders of an engine. As shown in FIG. 16 and FIG. 17, for example, the configuration is such that a holder (2) of an injector (not shown) is provided at one end of the wall of the fuel delivery pipe body (1) having a flat cross-sectional shape. Six tubular joints (3) are connected and fixed at right angles. In this connection, the fuel delivery pipe body (1) has six fuel outlets (4), and each of the outlets (4) is provided with a fuel inlet (5) in a tubular joint (3). The other end is inserted and connected. Furthermore, as shown in FIG. 17, the tubular joint (3) is provided with a flange portion (7) on the outer periphery at a predetermined interval from the other end, and this flange portion (7) is provided outside the fuel delivery pipe body (1). The tubular joint (3) and the fuel delivery pipe body (1) are fixed by welding or brazing at a right angle by engaging with the surface.

  By connecting the fuel delivery pipe main body (1) and the tubular joint (3), the fuel outlet port (4) and the inlet port (5) communicate with each other, and the fuel of the fuel delivery pipe main body (1) is connected to the tubular joint. Via (3), it can be supplied to an injector (not shown) connected to the holder part (2).

In addition, as shown in Patent Documents 1 to 3, there are some in which a holder portion is directly connected to a fuel delivery pipe body without interposing a tubular joint. These conventional inventions are provided with a lead-out port (4) on the wall surface of the fuel delivery pipe body (1) as in the conventional example 2 shown in FIGS. 6) protrudes from the upper wall of the cylindrical holder part (2). The insertion section (6) is provided with a fuel inlet (5).

Then, the insertion portion (6) of the holder portion (2) is inserted into the outlet port (4) at a right angle, and the upper wall of the holder portion (2) is brought into contact with the outer surface of the fuel delivery pipe body (1). The upper wall and the outer surface of the fuel delivery pipe main body (1) and the outer periphery of the insertion portion (6) and the inner surface of the fuel delivery pipe main body (1) are fixed by welding or brazing. As a result, the fuel delivery pipe main body (1) and the holder part (2) are connected and fixed, and the fuel outlet (4) and the inlet (5) are communicated with each other. Can be supplied to an injector (not shown) connected to the holder portion (2).
JP 2000-320422 A JP 2000-329030 A JP 2000-329031 A

  However, in each of the above prior arts, since the circular tubular joint (3) and the insertion portion (6) are inserted and fixed at right angles into the circular outlet (4), the contact area of these connection portions. Is a small contact area corresponding to the wall thickness of the annular inner end face of the outlet (4). Therefore, when the wall surface of the fuel delivery pipe body (1) is greatly deformed or a strong deformation force is applied due to a change in internal pressure during fuel injection, the fillet (8) on the outer periphery of the connecting portion and its surroundings are expanded. A strong tensile deformation stress acts on the contact surface between the inner end surface of the outlet port (4) and the outer peripheral surface of the tubular joint (3) or the insertion portion (6). Strong deformation stress is concentrated on a part of the contact surface. As a result, the fillet (8) and / or the base material beside the fillet (8) is cracked, the airtightness of the connecting portion is lowered, and there is a possibility of causing problems such as fuel leakage.

  In order to solve the above-described problems, the present invention solves the above-mentioned problem by applying a deformation stress to a part of the connection between the fuel delivery body and the tubular joint when a deformation force acts on the fuel delivery pipe body due to the fuel flow pressure or the injection pressure. It is possible to suppress the concentration of. And the airtightness of the connection part of a fuel delivery pipe main body and a tubular joint is maintained over a long period of time, and favorable fuel injection without a fuel leak etc. can be sustained.

  In order to solve the above-mentioned problems, the present invention has an introduction hole for introducing fuel on the side surface of a tubular joint provided with a holder portion for opening a fuel outflow hole and connecting an injector on one surface of a fuel delivery pipe body. An opening and a side surface of the tubular joint provided with the introduction hole are brought into contact with one surface of the fuel delivery pipe main body provided with the outflow hole so that the outflow hole and the introduction hole communicate with each other to provide a fuel flow path. A tubular joint and a fuel delivery pipe main body are connected by fixing the outer periphery of the tube by welding or brazing.

  Further, the fuel delivery pipe main body may connect and fix a fixing member capable of suppressing deformation of the fuel delivery pipe main body to the fuel delivery pipe main body across the outer surface of the tubular joint.

  The fuel delivery pipe body and the tubular joint are fixed by welding or brazing with an interposed member capable of suppressing deformation of the fuel delivery pipe body, and through a through hole provided in the interposed member. The outflow hole of the fuel delivery pipe main body and the introduction hole of the tubular joint may be communicated with each other.

  The intervening member is a bracket that is connected and fixed to the outer surface of the outflow hole of the fuel delivery pipe body. A through hole is provided in the bracket corresponding to the outflow hole of the fuel delivery pipe body, and a tubular joint is brought into contact with the bracket. Then, it may be fixed by welding or brazing, and the outflow hole of the fuel delivery pipe main body and the introduction hole of the tubular joint may be communicated with each other through a through hole provided in the bracket.

  The connecting portion of the tubular joint to the fuel delivery pipe main body may have a shape corresponding to the wall surface of the fuel delivery pipe main body, and the tubular joint and the fuel delivery pipe main body may be connected by surface contact.

  Further, the tubular joint may be formed integrally with the holder portion.

  In addition, the tubular joint may have a holder part formed separately.

  The present invention is configured as described above, and the side surface of the tubular joint provided with the holder portion of the injector is welded or brazed to one surface of the fuel delivery pipe body, so that the fuel delivery pipe body and the tubular joint are Are in contact with each other in a plane with their wall surfaces parallel to each other. Therefore, the contact area of the connecting portion can be remarkably increased compared to the case where the fuel delivery pipe body and the tubular joint or the like are connected and fixed at a right angle as in the conventional example. In addition, compared to the case where the fuel delivery pipe body and the tubular joint, etc., abut against each other at a right angle as in the conventional example, the deformation abuts in parallel, as in the present invention, disperses the deformation stress and suppresses concentration to a part. Can do.

  Therefore, the deformation stress due to fuel flow and fuel injection is dispersed, the occurrence of cracks in the fillet and its vicinity can be suppressed, and the airtightness of the connecting portion can be maintained over a long period of time. This makes it possible to obtain a high-quality fuel delivery pipe with excellent durability and excellent fuel injection.

  The fuel delivery pipe according to the first embodiment of the present invention will be described in detail with reference to FIGS. 1 and 2 below. (10) is a fuel delivery pipe body having a square cross-sectional shape perpendicular to the tube axis. A fuel introduction pipe (not shown) is connected to one end, and this fuel introduction pipe is connected to a fuel tank (not shown) via an underfloor pipe (not shown). The fuel in the fuel tank is transferred to the fuel introduction pipe through the underfloor pipe, and flows from the fuel introduction pipe to the fuel delivery pipe body (10). The fuel in the fuel delivery pipe main body (10) is injected into an intake pipe or a cylinder from an injector (not shown) connected to a tubular joint (11) described later.

  The fuel delivery pipe body (10) has four upper and lower walls (12) and both side walls (13) that are long in the tube axis direction. A fuel outflow hole (14) is formed on one surface of the upper and lower walls (12). Are opened in three places. On the other hand, the tubular joint (11) for supplying fuel from the fuel delivery pipe body (10) to the injector has a U-shaped side surface and is provided with holder portions (15) for connecting the injectors at both ends, and is tubular. An introduction hole (16) for introducing fuel is opened on the side surface of the joint (11). Further, the holder portion (15) may be formed integrally with the main body of the tubular joint (11), or may be formed separately and fixed to the main body of the tubular joint (11) by welding or brazing. However, it may be formed so as to be connected by screwing.

  And the pipe axis of the tubular joint (11) provided with the introduction hole (16) intersects the upper and lower walls (12) provided with the outflow hole (14) of the fuel delivery pipe body (10). The outflow hole (14) and the introduction hole (16) are communicated with each other. By this communication, a fuel flow path (17) from the fuel delivery pipe body (10) to the tubular joint (11) is formed. Then, as shown in FIG. 2, the fuel delivery pipe body (10) and the tubular joint (11) are fixed by welding or brazing on the outer periphery of the flow passage (17). 10) and the tubular joint (11) are connected.

  With such an arrangement, the upper and lower walls (12) of the fuel delivery pipe body (10) and the wall surface of the tubular joint (11) can be arranged in parallel, and the fuel delivery pipe body (1) and Compared with the case where the tubular joint (3) or the like is connected at a right angle, the contact area of the connecting portion can be remarkably increased. In addition, the melted metal or braze fillet (18) can further increase the contact area between the fuel delivery pipe body (10) and the tubular joint (11), while strengthening the connection strength and stabilizing the connection. It becomes possible to improve the sex.

  Although the tubular joint (11) has a circular cross-sectional shape, the cross-sectional shape of the vicinity of the introduction hole (16) to be connected and fixed to the fuel delivery pipe body (10) is elliptical or oval as shown in FIG. It is possible to ensure a larger contact area between the tubular joint (11) and the fuel delivery pipe body (10). Further, a bracket (20) for connecting and fixing to the engine body is connected and fixed to the fuel delivery pipe body (10).

  In the fuel delivery pipe formed as described above, when fuel is introduced from the fuel introduction pipe into the fuel delivery pipe body (10), the fuel flows out into the tubular joint (11) through the flow passage (17). (11) Fuel is injected into the intake pipe and the cylinder from the injector that flows in the interior and is connected to the holder portion (15).

  A strong deformation force acts on the upper and lower walls (12) and both side walls (13) due to the pulsation of this injection and the flow pressure of the fuel in the fuel delivery pipe body (10). A strong stress acts on the connection with (11). However, the upper and lower walls (12) and the wall surface of the tubular joint (11) are arranged in parallel, and this connection is contacted with a wide contact area via the fillet (18) by welding or brazing, The stress is dispersed and does not concentrate on a part. Therefore, by suppressing problems such as the occurrence of cracks in the fillet (18) and its vicinity, the fuel delivery pipe main body (10) and the tubular joint (11) are kept in good airtightness over a long period of time, and fuel leakage occurs. It is possible to increase the prevention effect. As a result, good fuel injection from the injector can be maintained, and a high-quality fuel delivery pipe with excellent durability can be obtained.

  In the second embodiment shown in FIGS. 3 and 4, as in the first embodiment, the tubular joint (11) is disposed in contact with one upper and lower walls (12) of the fuel delivery pipe body (10), and the upper and lower walls (12) are arranged. A flow passage (17) is formed by communicating the open outflow hole (14) with the introduction hole (16) opened in the tubular joint (11). Then, on the outer periphery of the flow passage (17), the fuel delivery pipe body (10) and the tubular joint (11) are fixed by welding or brazing, so that the fuel delivery pipe body (10) and the tubular joint ( 11). In the second embodiment, the connecting portion between the fuel delivery pipe main body (10) and the tubular joint (11) is fixed by a sturdy fixing member (21) made of a metal material. The fixing member (21) is welded or brazed to one of the upper and lower walls (12) across the tubular joint (11).

  At the fixing position of the fixing member (21), the deformation force acting on the upper and lower walls (12) due to the flow of fuel or the like can be dispersed and absorbed by the rigidity of the fixing member (21). Accordingly, the deformation stress acting on the connection portion between the fuel delivery pipe main body (10) and the tubular joint (11) can be reduced, and the deformation stress is not only dispersed in the wide contact area of the connection portion but also fixed. Also dispersed by the member (21), the strength of the connecting portion can be further increased, it is possible to continue the injection without fuel leakage and the like, and the durability of the product can be improved.

  A third embodiment of the present invention will be described with reference to FIGS. In the first and second embodiments, the fuel delivery pipe main body (10) and the tubular joint (11) are directly fixed by welding or brazing, but in the third embodiment, the fuel delivery pipe main body (10) is fixed. Between the tubular joint (11) and the tubular delivery (11), a sturdy metal plate-made interposing member (22) capable of suppressing deformation of the upper and lower walls (12) of the fuel delivery pipe body (10) is interposed. The interposed member (22) is connected and fixed to the outer surface of the fuel delivery pipe body (10) by welding or brazing, and the tubular joint (11) is welded or brazed to the upper surface of the interposed member (22). The connection is fixed by. With such an arrangement, the upper and lower walls (12), the interposed member (22), and the tubular joint (11) of the fuel delivery pipe body (10) are arranged in parallel and connected and fixed. Further, a through hole (23) is opened in the interposing member (22), and the outflow hole (14) of the fuel delivery pipe body (10) and the tubular joint (11) are opened through the through hole (23). A fuel flow path (17) is formed by communicating with the introduction hole (16).

  In the first and second embodiments, the tubular joint (11) having a U-shaped side surface is connected to the fuel delivery pipe body (10) having a square cross-sectional shape so as to intersect with the holder portion (15) of the injector. Is opened in the direction of the other upper and lower walls (12) of the fuel delivery pipe body (10). On the other hand, in Example 3, the fuel delivery pipe body (10) has a flat shape having a pair of narrow side walls (13) and a pair of wide upper and lower walls (12) and having a rectangular cross-sectional shape. It is formed into a shape. Also, one of the wide upper and lower walls (12) is a flexible absorber wall surface, and a tubular joint (11) having a U-shaped side surface is formed on the wide upper and lower wall (12) opposite to the absorber wall surface. The pipe members are connected and arranged through the interposition member (22) so that their pipe axes are parallel to each other. With this arrangement, as shown in FIG. 5, the holder portion (15) of the tubular joint (11) opens in the direction of one narrow side wall (13) of the fuel delivery pipe body (10). The bracket (20) is connected and fixed to the narrow side walls (13).

  As in Example 3, by inserting a sturdy interposing member (22) between the fuel delivery pipe main body (10) and the tubular joint (11), the interposition member (22) is connected at the connecting position. The deformation of the upper and lower walls (12) due to the flow pressure of the fuel can be suppressed, and the fuel delivery pipe body (10) and the tubular joint ( 11) can be fixed in contact with a wide area. Therefore, the deformation stress to the connection portion between the fuel delivery pipe main body (10) and the tubular joint (11) is reduced, and this deformation stress is dispersed by the connection portion having a wide contact area and the interposition member (22). The connection strength of the connection portion can be further strengthened, the connection stability can be improved, and good fuel injection without fuel leakage or the like can be achieved.

  A fourth embodiment of the present invention will be described with reference to FIGS. In the third embodiment, the metal plate interposed member (22) separate from the bracket (20) is used, but in the fourth embodiment, the bracket (20) is also used as the interposed member (22). is doing. In this configuration, a bracket (20) having an L-shaped side surface is fixed by welding or brazing to the wide upper and lower walls (12) of a flat fuel delivery pipe body (10) having a rectangular cross-sectional shape. Then, two tubular joints (11) having a U-shaped side surface are welded or brazed to the upper surface of the bracket (20), so that one of the upper and lower walls (12) is interposed via the bracket (20). A tubular joint (11) is connected to produce a 4-cylinder product. Also, the bracket (20) has a through hole (23) opened, and through the through hole (23), the outflow hole (14) opened in the upper and lower walls (12) and the side surface of the tubular joint (11). The open introduction hole (16) is communicated to form a fuel flow passage (17), and the bracket (20) and the tubular joint (11) are welded or brazed around the outer periphery of the flow passage (17). It is fixed.

  Also in the fourth embodiment, the fuel delivery pipe body (10) and the tubular joint (11) can be arranged in contact with each other with a wide contact area and parallel to each other via the bracket (20). At the same time, the deformation of the upper and lower walls (12) due to the fuel flow pressure can be suppressed by the rigidity of the bracket (20). Therefore, it is possible to prevent the concentration of deformation stress on a part of the connection between the fuel delivery pipe main body (10) and the tubular joint (11), and to maintain smooth fuel injection without fuel leakage. Become.

  In Examples 3 and 4, only the upper and lower walls (12) to which the bracket (20) is not attached are used as the absorber wall surfaces. However, the upper and lower walls (12) to which the bracket (20) is attached may also be used as the absorber wall surfaces. . Also in this case, the wall surface of the absorber is bent and deformed by the flow pressure of the fuel, but the deformation is suppressed at the portion where the bracket (20) is connected, and acts on the connection between the fuel delivery pipe body (10) and the tubular joint (11). The deformation stress to be reduced can be reduced.

  Next, a fifth embodiment of the present invention will be described with reference to FIGS. In the fourth embodiment, the tubular joint (11) is connected to the wide upper and lower walls (12) via the bracket (20) whose side shape is L-shaped, and the through hole (23) of the bracket (20) is used. The outflow hole (14) opened in the wide upper and lower walls (12) communicates with the introduction hole (16) opened in the side surface of the tubular joint (11). On the other hand, in Example 5, as shown in FIG. 10, the bracket (20) whose side surface shape is a crank shape is welded or brazed to one side wall (13) having a narrow width, and the upper and lower walls ( 12) and the bracket (20) are not connected and fixed, and a gap is interposed. The tubular joint (11) is connected to the narrow side walls (13) via the bracket (20). Thus, since the bracket (20) and the tubular joint (11) are not connected to the wide upper and lower walls (12), it is possible to make both the pair of wide upper and lower walls (12) a flexible absorber wall surface. it can.

  Further, a fuel outflow hole (14) is opened in the narrow side walls (13) of the fuel delivery pipe body (10), and a through hole (23) is formed in the bracket (20) at a position corresponding to the outflow hole (14). ) To communicate with the introduction hole (16) of the tubular joint (11) to form a fuel flow passage (17) between the fuel delivery pipe body (10) and the tubular joint (11). On the outer periphery of (17), the bracket (20) and the tubular joint (11) are fixed by welding or brazing.

  In the fifth embodiment, the fuel delivery pipe main body (10) and the tubular joint (11) can be arranged in contact with each other with a parallel wall surface and a wide contact area via the bracket (20). Dispersion of the deformation stress acting on the part can suppress the concentration of the deformation stress on a part. Furthermore, the deformation stress of both side walls (13) at the mounting position of the bracket (20) can be absorbed, and the deformation stress can be reduced. Accordingly, the connection strength between the fuel delivery pipe main body (10) and the tubular joint (11) is strengthened, and the connection stability is increased, so that the airtightness of the connection portion can be maintained for a long period of time, and the fuel leakage This makes it possible to inject fuel without any problems.

  In the fifth embodiment, the bracket (20) is connected and fixed only to the both side walls (13) and is not fixed to the upper and lower walls (12). However, in the sixth embodiment shown in FIG. Are fixed by welding or brazing to both side walls (13) and upper and lower walls (12). The tubular joint (11) is fixed by welding or brazing to both side walls (13) via the bracket (20).

  Next, a seventh embodiment of the present invention will be described with reference to FIGS. In the seventh embodiment, the bracket (20) is fixed by welding or brazing to one of the upper and lower walls (12), and the tubular joint (11) is fixed by welding or brazing to the outer surface thereof. Then, this tubular joint (11) is provided with both ends provided with the holder portion (15) protruding in a circular arc shape from one upper and lower wall (12) on the attachment side to the other upper and lower wall (12). At the same time, the other upper and lower walls (12) are defined as an absorber wall surface. Therefore, an injector is disposed on the lower surface of the other upper and lower walls (12) as the wall surface of the absorber, and the radiated sound from the injector during fuel injection can be absorbed by the other upper and lower walls (12). .

  An eighth embodiment of the present invention will be described with reference to FIG. In the eighth embodiment, similarly to the fourth embodiment shown in FIGS. 7 and 8, the tubular joint (11) is fixed by welding or brazing to the upper and lower walls (12) via the bracket (20). Yes. One tubular joint (11) has holder parts (15) on both sides, while the other tubular joint (11) has a three-cylinder structure by forming a holder part (15) on only one side. The fuel delivery pipe of the specification. Also in the case of Example 8, the cross-sectional shape near the connection portion is as shown in FIG.

  A ninth embodiment of the present invention will be described with reference to FIG. In the ninth embodiment, a straight tubular joint (11) provided with holder portions (15) on both sides is connected to one upper and lower walls (12) of the fuel delivery pipe main body (10) so that the pipe axes are parallel to each other. And a rigid metal plate intervention member (22) capable of suppressing deformation of the upper and lower walls (12) is interposed between the tubular joint (11) and the upper and lower walls (12). ing. By fixing the interposed member (22), the fuel delivery pipe main body (10) and the tubular joint (11) by welding or brazing, the outflow hole (14) of the fuel delivery pipe main body (10), the interposed The through hole (23) of the member (22) and the introduction hole (16) of the tubular joint (11) are communicated to form a fuel flow passage (17).

  Furthermore, in Example 9, the flow pipe (24) is inserted into the outflow hole (14), the through hole (23), and the introduction hole (16), and the outer periphery of the flow pipe (24) and the fuel delivery pipe main body (10 ) And the inner wall surface of the tubular joint (11) are fixed by welding or brazing, and the inside of the flow pipe (24) is used as a fuel flow passage (17). By arranging this flow pipe (24), the outflow hole (14), the through hole (23) and the introduction hole (16) are reliably aligned, and the fuel delivery pipe body (10) and the tubular joint (11 It is possible to secure a flow passage (17) in which the fuel can be smoothly circulated, and to prevent the flow passage (17) from being blocked due to brazing material dripping or the like. Therefore, the fuel can be smoothly and reliably supplied from the fuel delivery pipe main body (10) to the injector through the tubular joint (11).

  Furthermore, the presence of the flow pipe (24) increases the strength of the connection portion between the fuel delivery pipe body (10) and the tubular joint (11), and the flow pipe (24) is supported when stress is applied to the connection portion. Thus, the occurrence of cracks in the fillet (18) and its vicinity can be more effectively prevented. And it becomes possible to maintain the connection stability and airtightness of a connection part over a long period of time, and to maintain favorable fuel injection without a fuel leak etc. In this embodiment, both ends of the flow pipe (24) protrude into the fuel delivery pipe body (10) and the tubular joint (11), but both ends of the flow pipe (24) are connected to the fuel delivery pipe body ( It may be formed flush with the inner wall surface of 10) or the inner wall surface of the tubular joint (11).

  In each of the above embodiments, the cross section of the fuel delivery pipe body (10) is a square or a rectangle, but an oval, an oval, a triangle, a pentagon or more polygon, a key, a flask, a mortar, It is good also as shapes, such as a goggles shape. Further, the fuel delivery pipe main body (10) may be formed in the same shape from one end to the other end, and a part thereof may have a different shape. Further, the tubular joint (11) of the present invention may be connected to a fuel delivery pipe main body (10) having a wall surface having high rigidity and capable of suppressing deformation as shown in FIG. It may be connected to a fuel delivery pipe body (10) having an absorber wall surface as shown in FIG. Further, the tubular joint (11) of the present invention may be connected to a fuel delivery pipe body (10) formed by roll molding or sheet metal press molding, or a fuel delivery pipe body (10) in a mating box type made of sheet metal press. Regardless of the structure or manufacturing method of the fuel delivery pipe body (10), any fuel delivery pipe body (10) can maintain airtightness due to the effect of dispersion of deformation stress. It is possible. Further, the wall of the fuel delivery pipe main body (10) and the tubular joint (11), the bracket (20), the intervention member (22), the holder part (15), etc. may be fixed together by welding or brazing. good.

The perspective view of the fuel delivery pipe of Example 1 of this invention. Sectional drawing of the connection part of the fuel delivery pipe main body of Example 1 and a tubular coupling. The perspective view of the fuel delivery pipe of Example 2 of this invention. Sectional drawing of the connection part of the fuel delivery pipe main body of Example 2 and a tubular coupling. The perspective view of the fuel delivery pipe of Example 3 of this invention. Sectional drawing of the connection part of the fuel delivery pipe main body of Example 3 and a tubular joint. The perspective view of the fuel delivery pipe of Example 4 of this invention. Sectional drawing of the connection part of the fuel delivery pipe main body of Example 4 and a tubular coupling. The perspective view of the fuel delivery pipe of Example 5 of this invention. Sectional drawing of the connection part of the fuel delivery pipe main body of Example 5 and a tubular joint. Sectional drawing of the connection part of the fuel delivery pipe main body of Example 6 and a tubular coupling. The perspective view of the fuel delivery pipe of Example 7 of this invention. Sectional drawing of the connection part of the fuel delivery pipe main body of Example 7 and a tubular joint. The perspective view of the fuel delivery pipe of Example 8 of this invention. Sectional drawing of the fuel delivery pipe of Example 9 of this invention. The perspective view of the fuel delivery pipe of the prior art example 1. FIG. Sectional drawing of the connection part of the fuel delivery pipe main body of a prior art example 1, and a tubular joint. The perspective view of the fuel delivery pipe of the prior art example 2. FIG. Sectional drawing of the connection part of the fuel delivery pipe main body of the prior art example 2, and a holder part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Fuel delivery main body 11 Tubular joint 14 Outflow hole 15 Holder part 16 Introduction hole 17 Flow path 20 Bracket 21 Fixing member 22 Interposition member 23 Through-hole

Claims (7)

  An introduction hole for introducing fuel is opened on the side surface of a tubular joint provided with a holder portion for connecting an injector on one side of a fuel delivery pipe main body, and a tubular joint provided with this introduction hole. By contacting the side of the fuel delivery pipe with the outflow hole of the fuel delivery pipe body and communicating the outflow hole with the introduction hole to provide a fuel flow path, and fixing the outer periphery of this flow path by welding or brazing A fuel delivery pipe characterized by connecting a tubular joint and a fuel delivery pipe body.   2. The fuel delivery pipe according to claim 1, wherein the fuel delivery pipe main body has a fixing member capable of suppressing deformation of the fuel delivery pipe main body connected and fixed to the fuel delivery pipe main body across the outer surface of the tubular joint.   The fuel delivery pipe main body and the tubular joint are fixed by welding or brazing with an interposed member capable of suppressing deformation of the fuel delivery pipe main body, and through the through-hole provided in the interposed member, the fuel The fuel delivery pipe according to claim 1 or 2, wherein the outflow hole of the delivery pipe body and the introduction hole of the tubular joint are communicated with each other.   The intervening member is a bracket that is connected and fixed to the outer surface of the outflow hole of the fuel delivery pipe main body. A through hole is provided in the bracket corresponding to the outflow hole of the fuel delivery pipe main body, and a tubular joint is brought into contact with the bracket. 4. The fuel delivery pipe according to claim 3, wherein the outlet hole of the fuel delivery pipe main body and the introduction hole of the tubular joint are communicated with each other by welding or brazing and through a through hole provided in the bracket.   The connection part of the tubular joint to the fuel delivery pipe main body has a shape corresponding to the wall surface of the fuel delivery pipe main body, and the tubular joint and the fuel delivery pipe main body are connected by surface contact. 3 or 4 fuel delivery pipes.   The fuel delivery pipe according to claim 1, 2, 3, 4, or 5, wherein the tubular joint is formed integrally with a holder portion.   The fuel delivery pipe according to claim 1, 2, 3, 4 or 5, wherein the tubular joint has a holder part formed separately.