JP2006316650A - Fuel delivery pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable to reduce impulse wave and pulsation pressure generated with accompanying open and close of an injection nozzle and enable to reduce generation, transmission, propagation and radiation of noise in high frequency zone, and enable to connect and arrange a socket easily and surely to a connection pipe in a vertical direction. <P>SOLUTION: A fuel delivery pipe is provided with a flexible absorber wall surface on a wall surface, has a plurality of communication openings 17 opened thereon, and is provided with a plurality of sockets 18 projectingly provided with crossing a communication pipe 1 and communicating to a fuel passage 19 via the communication opening 17 of the communication pipe 1 at one end and connecting to a rear end of an injection nozzle 23 at another end. An inner diameter of a fuel flow in opening 28 provided on one end in a communication pipe 1 side of the socket 18 is formed double or more of an inner diameter of a fuel supply hole 30 on an injection nozzle 23 rear end. An engagement flange 21 is provided on one end outer circumference surface of the socket 18 projectingly in a radial direction, the engagement flange 21 is engaged and fixed in a wall surface inside of the communication pipe 1 and is arranged to have another end side of the socket 18 projected outward of the communication pipe 1 via the communication opening 17. <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 of a communication pipe having a fuel passage and an external structure of the communication pipe.

  A fuel delivery pipe is widely used in an electronic fuel injection system of a gasoline engine, and after returning fuel to a fuel injector from a communication pipe having a fuel passage through a plurality of cylindrical sockets, the fuel delivery pipe returns to the fuel tank side. There are a type having a return path and a type having no return path (returnless). Recently, there are increasing types that do not have a return passage to reduce transpiration gas with high-temperature return fuel and to reduce costs. Along with this, fuel delivery pipes and related parts vibrate due to reflected waves (shock waves) caused by the reciprocating movement of the spool, which causes the valve to open and close for injection from the injector, and fuel injection pulsation due to pulsation pressure, producing an audible noise. The problem that occurred. In addition, abnormal noise was also generated due to the impact accompanying the seating of the injector spool. In a so-called direct injection type engine in which fuel is directly injected into a combustion chamber, a high-pressure supply pump is provided. Therefore, a pulsation damper is provided to absorb the large pulsation, and a normal fuel injection type (MPI) Although it is also used in some cases in the case of engines, it is not easy to adopt due to space constraints and high costs.

  2. Description of the Related Art Conventionally, there is a fuel delivery pipe in which a part of a box-shaped cross section of a communication pipe is made a flexible absorber wall surface to absorb vibration. As shown in FIG. 8, the communication pipe (51) of the fuel delivery pipe (50) is made of a thin plate with an upper surface (54) facing the fuel inlet (53) of the socket (52) connected to the fuel injection valve. And provide an absorptive wall surface.

  FIG. 9 is an enlarged view of the relationship between the conventional socket (52) and the injection nozzle (55). When the upper surface (54) of the communication pipe (51) is an absorber wall surface, the injection nozzle (55) An elastic wave (shock wave) emitted from a fuel supply hole (56) (inner diameter: usually 4 to 5 mm) provided on the communication pipe (51) side is a recess that receives the rear end of the injection nozzle (55) in the socket (52). A standing wave is generated between the injection nozzle (55) and the fuel inlet (53) by reflection due to an abrupt cross-sectional change at the fuel inlet (53) provided at the upper end of the fuel tank. The delivery pipe (50) mechanically resonated, and there was a problem that noise in the high frequency range was transmitted, propagated, and radiated around the fuel delivery pipe (50).

Therefore, in the invention described in Patent Document 1, in order to reduce the shock wave and pulsation pressure generated when the injection nozzle (55) is opened and closed, the fuel provided at one end on the side of the communication pipe (51) of the socket (52). By forming the inner diameter of the inflow port (53) to be twice or more the inner diameter of the fuel supply hole (56) at the rear end of the injection nozzle (55), a sudden cross-sectional change at the fuel inflow port (53) can be prevented and fixed. The occurrence of standing waves is prevented.
JP 2003-314405 A

  However, in the invention described in Patent Document 1, the rear end of the socket (52) is inserted into the plurality of communication ports (57) formed in the communication pipe (51), respectively, so that the injection nozzle (55) and the communication pipe ( 51). However, in such a case, the socket (52) is not arranged vertically with respect to the communication pipe (51) in the assembly before fixing the socket (52) and the communication pipe (51). , Misalignment is likely to occur. In this state, when fixing is performed by brazing or the like, each socket (52) is fixedly arranged in an indefinite direction, or the length of projection of each socket (52) from the communication pipe (51) is There was a risk of inconvenience such as being different.

  The object of the present invention is to reduce the shock wave and pulsation pressure generated by opening and closing the injection nozzle, to reduce the generation, transmission, propagation and radiation of high frequency noise, and to connect the socket to the communication pipe. It is an object of the present invention to provide a novel structure of a fuel delivery pipe that can be connected and arranged in a vertical direction easily and reliably.

  In order to solve the above-mentioned problems, the first invention divides a wall surface composed of an upper wall, a bottom wall, and both side walls in the vertical direction, and provides at least one wall surface with a flexible absorber wall surface. In addition, a communication pipe having a plurality of communication openings opened therein and a fuel passage disposed therein, and projecting so as to intersect with the communication pipe, one end communicates with the fuel passage through the communication opening of the communication pipe, and the other end A plurality of sockets for connecting the rear end of the injection nozzle and a fuel introduction pipe fixedly connected to the communication pipe, and the inner diameter of the fuel inlet provided at one end of the socket on the communication pipe side is defined as a fuel supply hole at the rear end of the injection nozzle By reducing the noise in the high frequency range radiated from the fuel delivery pipe and reducing the pulsation pressure and shock wave of the fuel flowing into the socket by bending the absorber wall surface. ,socket Engage the flange on the outer peripheral surface of one end in the radial direction, and engage and fix the engagement flange to the inner wall surface of the communication pipe. The other end of the socket is connected to the outside of the communication pipe through the communication port. It arranges so that it may protrude.

  Further, the second invention divides the wall surface composed of the top wall, the bottom wall, and both side walls in the vertical direction, and provides a flexible absorber wall surface on at least one wall surface, and opens a plurality of communication ports, A communication pipe having a fuel passage disposed therein, a plurality of pipes projecting across the communication pipe, one end communicating with the fuel passage via a communication port of the communication pipe, and connecting the rear end of the injection nozzle to the other end A socket and a fuel introduction pipe connected and fixed to the communication pipe are provided, and the inner diameter of the fuel inlet provided at one end on the communication pipe side of the socket is formed to be at least twice the inner diameter of the fuel supply hole at the rear end of the injection nozzle. This reduces the noise in the high frequency range radiated from the fuel delivery pipe, and can reduce the pulsation pressure and shock wave of the fuel flowing into the socket by bending the wall of the absorber. Bend the wall inward The guide hole is provided, and an engagement rod protrudes from the inner periphery of the guide hole. The end of the socket is inserted into and fixed to the guide hole with the end surface of the socket being abutted against the engagement rod. is there.

  The third aspect of the invention divides the wall surface composed of the top wall, the bottom wall, and both side walls in the vertical direction, provides a flexible absorber wall surface on at least one wall surface, and opens a plurality of communication ports. A communication pipe having a fuel passage disposed therein, a plurality of pipes projecting across the communication pipe, one end communicating with the fuel passage via a communication port of the communication pipe, and connecting the rear end of the injection nozzle to the other end A socket and a fuel introduction pipe connected and fixed to the communication pipe are provided, and the inner diameter of the fuel inlet provided at one end on the communication pipe side of the socket is formed to be at least twice the inner diameter of the fuel supply hole at the rear end of the injection nozzle. This reduces the noise in the high frequency range radiated from the fuel delivery pipe and reduces the pulsation pressure and shock wave of the fuel flowing into the socket by bending the absorber wall surface. Protruding to stretch The socket formed by the stretching projecting and forms to protrude outwardly of the communicating pipe.

  The socket may have an inner surface that communicates with the inside of the communication pipe in a straight line.

  The present invention is configured as described above. Since the inner diameter of the fuel inlet is at least twice the inner diameter of the fuel supply hole at the rear end of the injection nozzle, the elastic wave emitted from the fuel supply hole of the injection nozzle is It does not collide with or reflect on the wall around the socket's fuel inlet to generate a standing wave, passes through the fuel inlet and propagates to the absorber wall, and can be attenuated without causing resonance. it can. As a result, it is possible to reduce the noise in the high frequency range radiated from the injection nozzle, and it is possible to reduce the pulsation pressure and the shock wave of the fuel flowing into the socket by the deflection of the absorber wall surface. In addition, by making the socket connectable to the communication pipe easily and reliably in the vertical direction, a product that is easy to manufacture and has high quality can be obtained.

  1 to 3, the first embodiment of the present invention will be described. (1) is a communication pipe, and as shown in FIG. It has a substantially rectangular and flat shape. The communication pipe (1) is divided into two parts in the vertical direction, and the upper body (2) and the lower body (3) are assembled by setting the upper body as the upper body (2) and the lower side as the lower body (3). A wall surface composed of an upper wall (4), a bottom wall (5), and both side walls (6) and (7) is formed on the communication pipe (1), and a pair of end walls formed in a flat plate shape at both ends of the wall surface. (8) (10) is provided.

  The fuel delivery pipe of the first embodiment will be described in detail. The upper body (2) and the lower body (3) forming the communication pipe (1) are each formed in a U-shaped cross section as shown in FIG. Has been. The upper body (2) is composed of an upper wall (4) and a pair of upper side walls (11), (12) connected to each other with an R portion at the corner, and the lower ends of both upper side walls (11), (12). Are provided with expanded portions (13) and (14) that are expanded outward. The lower body (3) includes a bottom wall (5) and a pair of lower side walls (15) and (16) connected to each other with an R portion at the corner, and the bottom wall (5) has an axial direction. Four circular communication ports (17) are provided at four desired intervals.

  The socket 18 provided in the communication port 17 includes a cylindrical socket body 20 having the same inner diameter and outer diameter from one end to the other end, and one outer periphery of the socket body 20. It is formed by an engagement flange (21) projecting radially on the surface. Further, the socket body (20) can be inserted into the communication port (17) by forming the outer diameter of the socket body (20) to be smaller than the diameter of the communication port (17) of the lower body (3). It is said.

  Then, from the inside of the lower body (3), the other end side of the socket body (20) opposite to the engagement flange (21) side is inserted into the communication port (17) to protrude outward, An engagement flange (21) is engaged with the inner surface of the bottom wall (5) of the lower body (3). In this engaged state, the socket (18) is reliably disposed at the communication port (17) due to the presence of the engaging flange (21), and there is no occurrence of displacement. The contact portion (22) between the inner surface of the bottom wall (5) and the engagement flange (21) is brazed and fixed in such a stable state. In the present embodiment, the contact portion (22) is fixed by brazing as described above, but may be fixed by welding in other different embodiments. Thus, the socket (18) can be positioned in any of the axial direction, the left-right direction, the pitch, etc. of the lower body (3) by arranging the engagement flange (21) on the inner surface of the bottom wall (5). It becomes easy to fix and arrange vertically without causing a shift or the like.

  Then, the upper ends of the lower side walls (15), (16) of the lower body (3) assembled with the socket (18) in this way are connected to the widened portions (13) of the upper side walls (11), (12) of the upper body (2). The upper body (2) and the lower body (3) are assembled by inserting them into the brackets (14). In addition, after the upper body (2) and the lower body (3) are assembled to form the wall surface of the communication pipe (1), the end walls (10) and (11) are assembled to both ends of the wall surface, respectively. It is possible to form a communication pipe (1) provided with a projection 18). The inner surface of the upper body (2) and the inner surface of the lower body (3) of the communication pipe (1) form a fuel passage (19) for fuel to pass through the communication pipe (1). .

  As shown in FIG. 3, the rear end (24) of the injection nozzle (23) can be inserted into the other end of the socket (18) protruding from the communication pipe as described above, and the communication pipe (1). As shown in FIG. 1, a fuel introduction pipe (25) for supplying fuel into the communication pipe (1) is connected to the side walls (6) and (7) of the pipe in a direction perpendicular to the axial direction of the communication pipe (1). Yes. Therefore, after the fuel is supplied from the fuel introduction pipe (25) into the fuel passage (19) of the communication pipe (1), the fuel is injected from the fuel introduction port (28) on the communication pipe (1) side of the socket body (20). The fuel can be injected into each intake passage or cylinder through a fuel supply hole provided in the nozzle (23).

  Further, on the upper side wall (11) of the upper body (2) of the communication pipe (1), as shown in FIG. 1, a thick and rigid flat plate bracket (26 for attaching the fuel delivery pipe to the engine body) is provided. ) And (27) are protruded perpendicularly to the axial direction. The dimensions of the communication pipe (1) are a plate thickness of 1.2 mm, a height of 6.4 mm, and a width of 32 mm. The upper wall (4) of the communication pipe (1) is a flexible absorber wall surface, and this absorber wall surface faces the fuel inlet (28) on the engagement flange (21) side of the socket (18). Therefore, it becomes possible to absorb vibrations and shocks during fuel injection.

  Further, as described above, the inner diameter and the outer diameter are the same from one end to the other end of the cylindrical socket body (20), and the inner diameter of the fuel inlet (28) is the fuel provided in the injection nozzle (23). The size is at least twice the inner diameter of the supply hole (30). Therefore, the elastic wave emitted from the fuel supply hole (30) of the injection nozzle (23) hardly collides / reflects on the wall surface around the fuel inlet (28) of the socket (18), and thus the standing wave. Without passing through the fuel inlet (28), it propagates to the absorber wall surface.

  Therefore, unlike the conventional fuel delivery pipe, it does not generate a standing wave in the socket (18) and is attenuated by the wall surface of the absorber. Especially, noise in the high frequency range is transmitted, propagated and radiated around the fuel delivery pipe. It is possible to prevent the noise in the high frequency range radiated from the injection nozzle (23), and the pulsation pressure and the shock wave of the fuel flowing into the socket (18) can be reduced by the bending of the absorber wall surface. .

  In the first embodiment, the socket (18) is assembled to the communication pipe (1) by engaging and fixing the engagement flange (21) provided on the socket (18) to the inner surface of the communication pipe (1). However, in the second embodiment corresponding to the second invention of the present application, the guide hole (31) is recessed in the communication pipe (1), and the tip of the socket (18) is inserted and fixed in the guide hole (31). Thus, the socket (18) is assembled to the communication pipe (1) without providing the engagement flange (21) on the socket (18).

  The second embodiment will be described in detail with reference to FIG. 4 and FIG. 5. As shown in FIG. 4, the communication pipe (1) of the second embodiment is similar to the communication pipe of the first embodiment. It is formed by assembling the lower body (3) and both end walls (8) (10). The bottom wall (5) of the lower body (3) is provided with four communication ports (17) in the axial direction at desired intervals. The bottom wall (5) around the communication port (17) is provided. The guide hole (31) is provided by recessing inwardly in a direction perpendicular to the axial direction. Thereby, the guide hole (31) is formed with an engagement rod (32) whose tip protrudes in the inner circumferential radial direction. The inner diameter of the guide hole (31) is slightly larger than the outer diameter of the socket (18) so that the tip of the socket (18) can be inserted into the guide hole (31). Further, the inner diameter of the communication port (17) of the lower body (3) is substantially the same as the diameter of the socket (18).

  In the above structure, first, the upper body (2) and the lower body (3) are assembled to form the communication pipe (1). Then, the front end of the socket (18) is inserted into the guide hole (31) of the lower body (3) of the communication pipe (1), and the end surface (33) on the front end side of the socket (18) is engaged with the engagement rod ( 32), the contact portion (34) between the outer peripheral surface of the socket (18) and the inner peripheral surface of the guide hole (31) is fixed.

  Thus, by inserting the socket (18) into the guide hole (31), it becomes easy to arrange the socket (18) perpendicularly to the communication pipe (1). Further, the socket (18) is abutted against the engagement rod (32) to connect and fix the socket (18) to the guide hole (31). The socket (18) can be fixedly disposed in the guide hole (31), and the insertion length of each socket (18) into the guide hole (31) can be easily made the same. In the second embodiment, as in the first embodiment, as shown in FIG. 5, the inner diameter of the fuel inlet (28) is twice the inner diameter of the fuel supply hole (30) provided in the injection nozzle (23). The socket 18 has the same diameter as the socket 18.

  In the first and second embodiments, the socket (18) is formed separately from the communication pipe (1) and assembled, but in the third embodiment of the third invention of the present application, the communication pipe (1) and The socket (18) is integrally formed. The third embodiment will be described in detail with reference to FIGS. 6 and 7. Similarly to the first and second embodiments, the third embodiment is formed by assembling the upper body (2) and the lower body (3). Yes. Further, the lower body (3) is provided with communication ports (17) at desired intervals at four locations in the axial direction. As shown in FIG. 6, the outer periphery of the communication port (17) is connected to the communication tube (1). The socket (18) is continuously formed on the lower body (3) by extending outward in a direction perpendicular to the axial direction.

  The upper body (2) is assembled to the lower body (3) with the socket (18) extended in this way to form the wall surface of the communication pipe (1), and both end walls (8), (10) are formed on the wall surface. As a result, the communication pipe (1) provided with the socket (18) can be formed. As described above, in the fuel delivery pipe of the third embodiment, it is not necessary to form the socket (18) separately from the communication pipe (1), and the labor for assembling the socket (18) to the communication pipe (1) can be saved. Therefore, it is possible to obtain an inexpensive product that is easy to manufacture. In the third embodiment, as in the first and second embodiments, as shown in FIG. 7, the inner diameter of the fuel inlet (28) is set to the inner diameter of the fuel supply hole (30) provided in the injection nozzle (23). The diameter is the same as the socket (18) at least twice. Further, since the socket is extended perpendicularly to the communication pipe as described above, the socket (18) can be connected to the communication pipe (1) in a stable state without causing a displacement of the socket (18). Can be fixedly arranged.

The perspective view of the fuel delivery pipe which shows Example 1 corresponding to 1st invention of this application. AA sectional view taken on the line AA of FIG. The front view which shows the state which connected the injection nozzle to the socket in Example 1. FIG. Sectional drawing of the fuel delivery pipe which shows Example 2 corresponding to 2nd invention of this application. The front view which shows the state which connected the injection nozzle to the socket in Example 2. FIG. Sectional drawing of the fuel delivery pipe which shows Example 3 corresponding to 3rd invention of this application. The front view which shows the state which connected the injection nozzle to the socket in Example 3. FIG. Sectional drawing of the fuel delivery pipe which shows a prior art example. The front view which shows the state which connected the injection nozzle to the socket in the prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Communication pipe 4 Upper wall 5 Bottom wall 6, 7 Side wall 17 Communication port 18 Socket 21 Engagement flange 23 Injection nozzle 24 Rear end 25 Fuel introduction pipe 28 Fuel inflow port 30 Fuel supply hole 31 Guide hole 32 Engagement rod 33 End surface

Claims (4)

  A communication system in which a wall surface composed of an upper wall, a bottom wall, and both side walls is divided in the vertical direction, a flexible absorber wall surface is provided on at least one wall surface, and a plurality of communication ports are opened to arrange fuel passages therein. A pipe, projecting so as to intersect this communication pipe, one end communicating with the fuel passage through the communication pipe communication port, and the other end connecting the rear end of the injection nozzle, and connection fixing to the communication pipe The fuel delivery pipe is radiated from the fuel delivery pipe by forming the inner diameter of the fuel inlet provided at one end of the socket on the communication pipe side to be twice or more the inner diameter of the fuel supply hole at the rear end of the injection nozzle. In addition to reducing the noise in the high frequency range and reducing the pulsation pressure and shock wave of the fuel flowing into the socket by bending the wall surface of the absorber, an engagement flange protrudes in the radial direction on the outer peripheral surface of one end of the socket. , Fuel delivery pipe, characterized in that the engagement flanges engage fixed to the wall inside the communicating pipe, the other end of the socket, and disposed so as to protrude outwardly of the communicating conduit via the communication port.   A wall consisting of a top wall, a bottom wall, and both side walls is divided in the vertical direction, a flexible absorber wall surface is provided on at least one wall surface, a plurality of communication ports are opened, and a fuel passage is arranged inside A pipe, projecting so as to intersect this communication pipe, one end communicating with the fuel passage through the communication pipe communication port, and the other end connecting the rear end of the injection nozzle, and connection fixing to the communication pipe The fuel delivery pipe is radiated from the fuel delivery pipe by forming the inner diameter of the fuel inlet provided at one end of the socket on the communication pipe side to be twice or more the inner diameter of the fuel supply hole at the rear end of the injection nozzle. The pulsation pressure and shock wave of the fuel flowing into the socket can be reduced by bending the wall of the absorber wall, and the wall around the communication port is bent inward. When a guide hole is provided In addition, a fuel is characterized in that an engagement rod protrudes from the inner periphery of the guide hole, and the front end of the socket is inserted into and fixed to the guide hole with the end surface of the socket being abutted against the engagement rod. Delivery pipe.   A wall consisting of a top wall, a bottom wall, and both side walls is divided in the vertical direction, a flexible absorber wall surface is provided on at least one wall surface, a plurality of communication ports are opened, and a fuel passage is arranged inside A pipe, projecting so as to intersect this communication pipe, one end communicating with the fuel passage through the communication pipe communication port, and the other end connecting the rear end of the injection nozzle, and connection fixing to the communication pipe The fuel delivery pipe is radiated from the fuel delivery pipe by forming the inner diameter of the fuel inlet provided at one end of the socket on the communication pipe side to be twice or more the inner diameter of the fuel supply hole at the rear end of the injection nozzle. In this type, the pulsation pressure of the fuel flowing into the socket and the shock wave can be reduced by bending the wall of the absorber. Due to stretch protrusion Fuel delivery pipe, characterized in that the formed socket, formed by projecting outward of the communication pipe.   4. The fuel delivery pipe according to claim 1, wherein the inner surface of the socket communicates with the inside of the communication pipe in a straight line.