JP5106613B2 - Fuel delivery pipe - Google Patents

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 that returns 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 rider. Therefore, for the purpose of reducing pressure pulsation, as shown in Patent Document 1, pressure pulsation is applied to the fuel delivery pipe. The thing with the pulsation absorption function which can absorb is proposed.

  These fuel delivery pipes with pressure pulsation absorption function absorb the pressure pulsation by forming a flexible absorber wall surface in the communication pipe and bending and deforming the absorber wall surface under the pressure generated by fuel injection. It is possible to reduce noise and prevent generation of abnormal noise due to vibration of fuel delivery pipes and other parts.

  However, in the fuel delivery pipe shown in Patent Document 1, when the flexibility of the absorber wall surface is increased, the radiated sound in the high frequency region generated when the spool of the injection nozzle is seated on the valve seat is likely to be amplified. Larger high frequency radiated sound is transmitted, propagated and radiated around the fuel delivery pipe. Therefore, as described in Patent Document 1, in the fuel delivery pipe in which the communication pipe is provided with the absorber wall surface, there is a problem of noise due to the radiated sound in the high frequency range.

Therefore, in a fuel delivery pipe having an absorptive wall surface in the communication pipe, in order to reduce radiated sound in a high frequency range, as shown in Patent Document 2, a flat plate material is provided on the absorptive wall surface in a direction crossing the length direction of the absorptive wall surface. It is intended to increase the rigidity of the above-mentioned absorber wall surface by tightly fixing to the surface, to reduce the noise in the high frequency range radiated from the fuel delivery pipe, and to reduce the pulsation pressure and shock wave of the fuel by the deflection of the absorber wall surface. Fuel delivery pipes are known.
JP 2000-329031 A JP 2004-3422 A

  However, the fuel delivery pipe as shown in Patent Document 2 has a stress concentration in the tensile direction at the boundary in the width direction of the communication pipe between the absorber wall and the plate when internal pressure is applied. Is concerned.

  Therefore, in order to solve the problems as described above, 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 first aspect of the present gun has been made to solve the such problem described above, the wide outer wall forming a passage for connecting the socket and the internal wall of the wide provided to face the outer wall The communication is provided with an absorber wall surface and a substantially U-shaped concave groove in the longitudinal direction at the center in the width direction of the inner wall by the narrow side walls connecting the outer wall and the inner wall integrally. the tube was formed on the surface of the inner wall of the communicating pipe, only setting the bulged portion in the longitudinal direction central portion to form a bent portion, bridging provided a flat portion in the center portion of the expanded portion 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. In addition to being connected and fixed via the concave groove, a gap is provided between the bulging portion and the inner wall.

  According to a second aspect of the present invention, a wide external wall having a communication port for connecting a socket, a wide internal wall provided opposite to the external wall, and the external wall and the internal wall are integrally formed. With the narrow side walls to be connected, a communication pipe having an absorber wall surface and a substantially U-shaped concave groove in the length direction is formed in the center in the width direction of the inner wall, and the inner wall of the communication pipe is On the surface, a bridge member is formed with a bulging portion formed at the center in the longitudinal direction and a flat connecting portion formed at both ends of the bulging portion, and the bulging portion protrudes outward. One or a plurality of bridge members are arranged in a direction intersecting the axial direction of the inner wall, and the connecting portion of the bridge member is brought into surface contact with the surface of the inner wall to be connected and fixed via the recessed groove, and An interval is provided between the protruding portion and the inner wall.

  The communication pipe may be a pipe type having an integral structure, or may be a joint box type in which the upper and lower parts are divided.

  The invention of the present application 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, The generation, transmission, propagation, and radiation of the radiated sound in the area can be reduced, and the bent portion is formed when the internal pressure is applied by forming the bent portion in the bridge member and providing the bulging portion. In order to absorb stress in the pulling direction of the absorber wall surface and to prevent stress concentration, damage to the absorber wall surface can be prevented.

First of application 1, when Example 1 of the bright-second shot will be described In FIG. 1 and FIG. 2, (1) it is a communicating pipe having a fuel passage (2) therein, together with no flap piece The pipe-type element pipe having the structure is deformed into a flat and substantially rectangular parallelepiped shape by pressing from the outer surface to form a flat and flexible absorber wall surface (3), and fuel pressure pulsation is generated by the absorber wall surface (3). Absorption is possible. 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. Then, 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), and the cross-sectional shape is substantially goggle type. Then, on the surface of the inner wall (5) of the communication pipe (1), as shown in FIGS. 1 and 2, one bridge member (10) is provided at the center in the length direction of the inner wall (5). While being fixedly arranged, the connecting portion (13) of the bridge member (10) is connected and fixed to both sides of the concave groove (22).

  That is, the bridge member (10) is formed by bending a rectangular plate material in the width direction to form a plurality of bent portions (11), thereby providing a flat portion (9) at the center in the length direction. A protruding portion (12) is formed. 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 shaft of the inner wall (5). It is arranged in the vertical direction which is the direction intersecting with the direction, and the connecting 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, a space is formed between the surface of the inner wall (5) and the bridge member (10) as shown in FIG. As described above, the bridge member (10) is fixedly arranged on the surface of the inner wall (5) of the communication pipe (1), so that the bent portion (11) is deformed when the internal pressure is applied. Therefore, 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.

1 is a plan view of a fuel delivery pipe showing Example 1. FIG. JJ sectional view taken on the line of FIG.

DESCRIPTION OF SYMBOLS 1 Communication pipe 3 Absorb wall surface 4 External wall 5 Internal wall 6 Side wall 9 Flat part
DESCRIPTION OF SYMBOLS 10 Bridge member 11 Bending part 12 Bumping part 13 Connection part 22 Groove

Claims (4)

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 And forming a communication pipe having an absorptive wall surface and a substantially U-shaped groove in the longitudinal direction at the center in the width direction of the inner wall, and forming a bent portion on the surface of the inner wall of the communication pipe. formed by only setting the bulged portion in the longitudinal direction center portion, the bridging member is provided with a flat portion in the center portion of the expanded portion, the axial direction of the inner wall to project the bulging portion outward Is arranged in the crossing direction, and both ends in the width direction of the communication pipe of the bridge member are connected and fixed to the surface of the inner wall via the concave groove, and the bulging portion and the inner wall A fuel delivery pipe characterized by a gap between the two. 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 And forming a communication pipe having an absorptive wall surface and a substantially U-shaped groove in the longitudinal direction at the center in the width direction of the inner wall, and forming a bent portion on the surface of the inner wall of the communication pipe. formed with Keru set bulges in the longitudinal direction center portion of the bridging member formed with a flat connecting portion at both ends of the bulging portion, the axis of the internal wall is projected to the expanded portion outwardly One or more are arranged in the crossing direction, and the connecting portion of the bridge member is brought into surface contact with the surface of the inner wall to be connected and fixed through the concave groove, and the bulging portion and the inner wall A fuel delivery pipe characterized by a gap between the two. 3. The fuel delivery pipe according to claim 1, wherein the communication pipe is a pipe type having an integral structure. The fuel delivery pipe according to claim 1 or 2, wherein the communication pipe is in the form of a mating box divided into upper and lower parts.

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