JP2005127195A - Fuel delivery pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent vibration and noise from occurring from underfloor pipes by reducing pressure pulsation when a fuel injected by an injection nozzle and reduce the radiation of noise in a high frequency area from a fuel delivery body to the outside. <P>SOLUTION: At least one wall surface of the fuel delivery body 1 is formed in a flexible absorbing wall surface 2, and elastomer elastic body 3 having an inner surface brought into contact with the absorbing wall surface 2 and elastically deforming according to the deformation of the absorbing wall surface 2 is disposed at least one outer surface of the absorbing wall surface 2. A support body 4 holdingly brought into contact with the elastic body 3 and fixed so that the elastic body can be elastically deformed in the clearance thereof from the absorbing wall surface 2 is disposed on the outer surface of the elastic body 3. <P>COPYRIGHT: (C)2005,JPO&NCIPI

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 to each intake passage of the engine via an injection nozzle. The purpose is to reduce pressure pulsation and radiation noise.

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

  This fuel delivery pipe has a return type that has a circuit that returns the extra fuel to the fuel tank by a pressure regulator when extra fuel is supplied from the fuel tank, and a circuit that returns the extra fuel to the fuel tank. There is no returnless type. Recently, returnless fuel delivery pipes are often used for the purpose of reducing costs and preventing an increase in gasoline temperature in a fuel tank.

  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 fuel injection from the engine intake pipe or the injection nozzle to the cylinder, Pressure waves generated by sudden pressure reduction and stop of fuel injection cause pressure pulsation inside the fuel delivery pipe. This pressure pulsation is propagated from the fuel delivery pipe and the connecting pipe connected to the fuel delivery pipe to the fuel tank side, then reversed and returned from the pressure regulating valve in the fuel tank, and then the fuel delivery pipe is connected via the connecting pipe. Is propagated to. The fuel delivery pipe is provided with a plurality of injection nozzles, and the plurality of injection nozzles sequentially inject fuel to generate pressure pulsation. As a result, the underfloor piping is propagated as noise into the vehicle through the clip that holds the underfloor pipe under the floor, and this noise causes discomfort to the driver and the rider.

  Conventionally, as a method of suppressing such harmful effects caused by pressure pulsation, a pulsation damper containing a rubber diaphragm is placed in a returnless type fuel delivery pipe, and the generated pressure pulsation energy is absorbed by this pulsation damper. If the underfloor pipe located under the floor from the fuel delivery pipe to the fuel tank side is fixed to the underfloor via a vibration absorbing clip, this occurs in the fuel delivery pipe or underfloor pipe to the tank. Absorbing vibration is done. These methods are relatively effective and have the effect of suppressing the adverse effects caused by the occurrence of pressure pulsation.

In addition, as in the inventions shown in Patent Documents 1 to 6, a fuel delivery pipe having a pulsation absorbing function capable of absorbing pressure pulsations has been proposed for the purpose of reducing pressure pulsations. Fuel delivery pipes with these pressure pulsation absorbing functions form a flexible absorber surface on the outer wall of the fuel delivery pipe, and the pressure generated by fuel injection causes the absorber surface to bend and deform. Absorbs and reduces pulsation, making it possible to prevent the generation of noise due to the vibration of fuel delivery pipes and other parts.
JP 2000-329030 A JP 2000-320422 A JP 2000-329031 A Japanese Patent Laid-Open No. 11-37380 Japanese Patent Laid-Open No. 11-2164 JP-A-60-240867

  However, pulsation dampers and vibration-absorbing clips are expensive, increasing the number of parts and increasing costs, and creating new problems in securing installation space. On the other hand, in the conventional techniques shown in Patent Document 1 to Patent Document 6, there is an effect of absorbing pressure pulsation, but it occurs when the injection nozzle is seated on a spool valve seat or the like with the opening and closing of the injection nozzle during fuel injection. Sounds in the high frequency range of several kHz or more, such as ticking noises, may cause problems that are radiated to the outside due to the speaker surface exhibiting the speaker effect.

  The present invention is intended to solve the above-described problems, and reduces pressure pulsation during combustion injection by an injection nozzle, prevents generation of vibration and noise in an underfloor pipe, and eliminates the occurrence of vibration from a fuel delivery main body. An object of the present invention is to obtain a fuel delivery pipe provided with means capable of reducing radiated sound. In addition, this high pressure pulsation and radiated noise reduction means can be formed without using expensive parts such as pulsation dampers and vibration absorbing clips to reduce manufacturing costs and fuel delivery pipes. Installation is possible even in a limited space by suppressing an increase in outer diameter.

  In order to solve the above-mentioned problems, the present invention connects a fuel introduction pipe to a returnless type fuel delivery body that has an injection nozzle and is not provided with a return circuit to the fuel tank, and this fuel introduction pipe is connected to an underfloor pipe. In the fuel delivery pipe connected to the fuel tank via, at least one wall surface of the fuel delivery body is a flexible absorber wall surface, and at least one outer surface of the absorber wall surface is in contact with the inner surface of the absorber wall surface, An elastic body made of elastomer that is elastically deformed in response to the bending of the wall surface of the absorber is disposed, and the elastic body is elastically deformed between the outer surface of the elastic body and abutting against and supporting the elastic body. A support that is fixed so as to be possible is provided.

  Further, the elastic body may be supported and fixed by a rigid material support having one end fixed to the wall surface of the fuel delivery main body.

  In addition, the elastic body is disposed on at least one outer surface of the opposite absorber wall surface of the fuel delivery body, and is sandwiched and fixed by the inner surface of a double-sided support body made of a rigid material that sandwiches and fixes the fuel delivery body from both surfaces facing each other. May be.

  Further, the elastic body may be sandwiched and fixed on the outer periphery of the fuel delivery body by a support body formed of a rigid belt made of a rigid material wound in a direction orthogonal to the tube axis of the fuel delivery body.

  Further, the elastic body may be provided with a rigid back plate on the side opposite to the absorber wall surface, and supported and fixed by the support body via the back plate.

  Moreover, you may fix a support body to the structure part of a motor vehicle.

  Further, the support may be formed independently of the automobile structural part.

  The elastic body may be compressed in advance between the absorber wall surface and the support.

  The present invention is configured as described above, and a good reduction effect of low frequency pulsation, which is a problem with pressure pulsation, can be obtained by bending and deforming the absorber wall surface. In addition, when pulsation in the high frequency range that causes radiated sound such as ticks is generated, the elastic body made of elastomer placed in contact with the wall surface of the absorber is deformed and deformed. Suppresses deformation of the wall surface. As a result, it is possible to reduce the occurrence of a ticking sound or the like when the injection nozzle is seated on the valve seat or the like of the spool. In addition, the pulsation and radiated sound attenuation means has a simple structure consisting of an elastomeric elastic body and a support, so that it is smaller than when a pulsation damper or a vibration absorbing clip is used. Production at low cost is possible. Further, the fuel delivery pipe and the underfloor piping are not bulky, and the fuel delivery pipe can be installed even in a limited space, so that the degree of freedom in installation layout is high.

  As shown in the conceptual diagram of FIG. 1, the means for reducing vibrations and radiated sound of the fuel delivery pipe according to the present invention is provided on the outer surface of at least one absorber wall surface (2) of the fuel delivery body (1) with an elastomeric body ( 3) is placed in contact, and on the outer surface of the elastic body (3), a support body (4) for supporting and fixing the elastic body is arranged so that the elastic body can be elastically deformed with the absorber wall surface (2). ing. By adopting such a configuration, while maintaining the low frequency pulsation reduction effect which is a problem in the pressure pulsation at the time of fuel injection from the injection nozzle, in the high frequency range which is a problem with radiated sounds such as ticks. It is possible to reduce the vibration of the fuel delivery body (1) and suppress the radiation of the emitted sound to the outside.

  A mechanism for reducing pressure pulsation and radiated sound in the fuel delivery pipe will be described with reference to FIG. 2 and Equation 1 below. The amplitude ratio M of the damped vibration is expressed by Equation 1 below, and is an elastomer elastic body. It is determined by (3) and the absorber wall surface (2) of the fuel delivery body (1) and depends on the ratio of the natural frequency fn of the main vibration mode that generates radiated sound and the input frequency f. FIG. 2 shows the amplitude for each f / fn in the fuel delivery body (1) in which the elastic body (3) is arranged as shown in FIG. 1 and in the fuel delivery body (1) in which the elastic body (3) is not arranged. The ratio M is shown.

  As shown in the graphs of Equation 1 and FIG. 2, in the low frequency range where pressure pulsation is a problem, the damping capacity has little influence on the bending deformation of the absorber wall surface (2). In any case, pulsations in the low frequency range can be effectively reduced. On the other hand, in the resonance part of the high frequency fuel delivery body (1), which is a problem with radiated sound, the elastic body (3) suppresses the bending deformation of the absorber wall surface (2), and the damping capacity acts remarkably. It is possible to suppress the radiation of sound to the outside in a high frequency range. Therefore, the radiation from the fuel delivery body (1) is adjusted by appropriately adjusting the hardness and thickness of the elastomer of the elastic body (3) and the holding force at the support portion (4) to attenuate the vibration at the resonance portion. It is possible to suppress the generation of sound.

  In addition, when the two opposing wall surfaces of the fuel delivery body (1) are the absorber wall surfaces (2), when the internal pressure is received by pulsation, the two absorber wall surfaces (2) facing each other as shown in FIG. Bulge and deform outward and always deform in opposite phases. Therefore, when it is structurally difficult to place the elastic body (3) in contact with the absorber wall surface (2) as shown in FIG. By utilizing the fact that the wall surface (2) is deformed in an opposite phase, as shown in FIG. 3, the support body (4) is formed into a clamped shape having a substantially C-shaped or substantially U-shaped side surface. The elastic body (3) is clamped and fixed on the inner surface of the support (4) by sandwiching the opposing absorber wall surface (2) from both sides.

  With the configuration as described above, the elastic body (3) is fixed in a stationary manner on the support body (4) side. When the pulsation in the low frequency region occurs, the pulsation is reduced by the bending deformation of the absorber wall surface (2). For the pulsation in the high frequency region, the elasticity is accompanied by the bending deformation of the absorber wall surface (2). The body (3) is deformed and absorbs the bending of the absorber wall surface (2). Therefore, as in the case shown in FIG. 1, the effect of reducing pressure pulsation and radiation sound can be obtained.

  Moreover, when the elastic body (3) is supported and fixed by the support body (4), the elastic body (3) has a strength such that it is elastically compressed in advance between the absorber wall surface (2) and the support body (4). The elastic body (3) is strongly fixed and fixed to the surface of the absorber wall surface (2). In this way, the elastic body (3) is compressed in advance between the absorber wall surface (2) and the support body (4), so that the elastic body (3) is absorbed when the absorber wall surface (2) vibrates. ) And the hardness of the elastic body (3) can be increased to increase the strain energy of the elastic body (3) with the same amount of deformation. Thereby, the elastic body (3) can exhibit a great reduction effect of radiated sound.

  In addition, the support body (4) for sandwiching both surfaces in this specification means that the fuel delivery body (1) is sandwiched and fixed from both surfaces of the opposing wall surface like a clip or a clamp and is in contact with the absorber wall surface (2). What is necessary is just to support and fix the arranged elastic body (3). If the fuel delivery body (1) is sandwiched and fixed from both sides, the side shape may be U-shaped, Ω-shaped, U-shaped, C-shaped, J-shaped, or the like.

  Examples of concrete implementation of the present invention are shown below. First, in Example 1 shown in FIG. 4, the fuel delivery body (1) has a substantially flask-like cross-sectional shape in which a cross-sectional shape perpendicular to the tube axis direction is a substantially rectangular shape placed on the top of the trapezoid. Yes. Then, a pair of side walls (5) bent inward by forming a flask shape, a top wall (6) and a bottom wall (7) connecting them, and a pair disposed at both ends in the tube axis direction The fuel delivery main body (1) is composed of the end wall (8) of the fuel cell. A fuel introduction pipe (10) for supplying fuel into the fuel delivery body (1) is connected and fixed to one of the pair of end walls (8), and a plurality of sockets (11) connected and fixed to the bottom wall (7) are connected. ) Is connected to an injection nozzle (12) for injecting fuel into the intake passage or the cylinder. The pair of side walls (5) bent inward is a pair of absorber wall surfaces (2) that can be bent and deformed by receiving pressure generated by fuel injection from the injection nozzle (12).

  A pair of short elastic elastomer bodies (3) made of an elastomer is provided in contact with the outer surface of the opposite absorber wall surface (2) at the substantially central portion of the fuel delivery body (1) as described above. Yes. In this embodiment, the elastic body (3) is made of a steel plate having rigidity that does not deform in conjunction with the deformation of the absorber wall surface (2) on the back surface of the elastic body (3). A rectangular back plate (13) having substantially the same dimensions is integrally connected and fixed. The back plate (13) may have a relatively thin plate shape as in the present embodiment, or may have a relatively thick block shape.

  Then, the pair of elastic bodies (3) provided with the back plate (13) is arranged so that the elastic bodies (3) are in contact with the absorber wall surface (2), and orthogonal to the tube axis of the fuel delivery body (1). The elastic body (3) is clamped and fixed to the outer periphery of the fuel delivery body (1) by a support body (4) formed by a steel fixing belt wound in the direction. In the present embodiment, the fixed belt-like support (4) is narrower than the elastic body (3) and the back plate (13). Even in such a narrow support body (4), the back plate (13) made of a rigid material has substantially the same dimensions as the elastic body (3). ), The surface of the elastic body (3) opposite to the absorber wall surface (2) can be fixed in a passive manner.

  Here, as shown in FIG. 1, in the fuel delivery body (1) whose cross section perpendicular to the tube axis direction is rectangular and flat, when each of the absorber wall surfaces (2) is bent outwardly by the internal pressure, As shown in the conceptual diagram of FIG. 15, the distance between the end points of each absorber wall surface (2) also increases (solid line in FIG. 15). For this reason, the support (4) in the form of a fixed belt may loosen and weaken the support force of the elastic body (3). However, in the case where the absorber wall surface (2) is bent inward like the fuel delivery main body (1) of the first embodiment, as shown in the conceptual diagram of FIG. (Solid line in FIG. 16), the distance between the end points of each absorber wall surface (2), that is, the distance between the upper wall (6) and the bottom wall (7) also becomes longer. When the distance between the end points becomes longer, a load in the extension direction is applied from the fuel delivery body (1) to the inner surface of the support (4) in the form of a fixed belt, and tension is generated on the support (4). A strong clamping force of the elastic body (3) is generated. Therefore, for example, even with the support body (4) using a fixed belt having relatively low rigidity, it is possible to obtain a sufficient clamping force of the elastic body (3).

  In the fuel delivery pipe as described above, the inside of the fuel delivery body (1) is suddenly depressurized by the fuel injection from the injection pipe (12) to the intake pipe or cylinder of the engine, or a pressure wave is generated by stopping the fuel injection. When pressure pulsation occurs inside the fuel delivery body (1), the flexible absorber wall surface (2) is deflected outwardly and deformed, so that between the end points of each absorber wall surface (2), that is, the upper wall The distance between (6) and the bottom wall (7) also becomes longer. Therefore, the internal volume of the fuel delivery body (1) can be increased as a whole, and an absorption effect with high pressure pulsation in a low frequency region can be obtained. As a result, it is possible to satisfactorily suppress pressure pulsation and noise transmission / propagation to the underfloor piping.

  On the other hand, an elastic body (3) arranged in contact with the absorber wall surface (2) against pulsations in a high frequency range, which is a problem caused by a tick generated when the spool of the injection nozzle (12) is seated on a valve seat or the like. ) Is greatly distorted between the absorber wall surface (2) and the support (4), thereby absorbing the deflection of the absorber wall surface (2) and effectively generating pulsation that causes high frequency sound. Therefore, it is possible to reduce the generation of radiated sound.

  In the above embodiment, only one pair of elastic bodies (3) is disposed at the approximate center of the fuel delivery body (1). However, in the embodiment 2 shown in FIG. 5, the fuel delivery body (1) in the tube axis direction is arranged. Two pairs of elastic bodies (3) are disposed on both ends. The fuel delivery body (1) of the second embodiment is assumed to be provided with three injection nozzles (12), and two injection nozzles (12) on the side close to the pair of end walls (8) of the fuel delivery body (1). Each of the elastic bodies (3) is disposed in the vicinity. Also in this embodiment, a steel back plate (13) is disposed outside the elastic body (3), and the elastic body (3) is fixed to the fuel delivery main body (1) by a fixed belt-like support (4). ) Is supported and fixed to the outer periphery of

  Note that, in the pulsation in the high frequency range which is a problem with the radiated sound, the absorber wall surface (2) has a mode shape having at least one antinode and node. By disposing the elastic body (3) on the abdomen, it is possible to effectively absorb the bending of the absorber wall surface (2), and to enhance the effect of reducing radiated sound.

  Here, in the fuel delivery main body (1) of Example 2, a noise measurement experiment was performed in order to verify the effect of reducing pulsation in a high frequency region that is a problem with radiated sound. In this measurement experiment, noise was measured through a microphone when fuel was introduced into the fuel delivery body (1) and fuel was injected by each injection nozzle (12). This microphone was placed at a position 100 mm above the upper wall (6) in the axial direction of the injection nozzle (12), and the noise was measured.

  As Comparative Example 1 of Example 2, the shape and the like of the fuel delivery main body (1) are the same as those of Example 2, but the same experiment was performed even without any elastic body (3).

  The magnitude of the radiated sound in each frequency range is shown in the graph of FIG. From this graph, it can be seen that the effect of reducing radiated sound in the high frequency range is higher in Example 2 than in Comparative Example 1.

  In the fuel delivery body (1) in which the elastic body (3) of Comparative Example 1 is not disposed due to the effect of reducing the radiated sound in the high frequency range, the overall noise was 76.8 dBA. In the fuel delivery body (1) in which the elastic body (3) of Example 2 is arranged, the overall noise is 75.7 dBA, which is a significantly lower value than that of Comparative Example 1.

  In the first and second embodiments, one or two elastic bodies (3) shorter than the fuel delivery main body (1) are arranged, and each is supported by a narrow fixed belt-like support (4). In another embodiment 3 which is fixed, as shown in FIG. 7, the support body (4) is formed with a width substantially the same as the length of the fuel delivery body (1), and the entire fuel delivery body (1) is formed. Is covered with a support (4). An elastic body (3) is disposed between the inside of the support (4) and the pair of absorber wall surfaces (2). The elastic body (3) may be disposed in contact with the outer surface of the absorber wall surface (2) as a pair that is long in the tube axis direction of the fuel delivery body (1). 2 may be arranged in series on the outer surface of the absorber wall surface (2).

  As shown in Example 3, by supporting and fixing the elastic body (3) with the wide support body (4), the fixing force to the elastic body (3) is increased and the support stability is also increased, so that the elastic body (3) The pulsation damping effect in the high frequency range due to can be exhibited with high reliability.

  Further, when the entire back surface of the elastic body (3) is supported and fixed by the support body (4) in this way, the support body (4) alone has a sufficient fixing force to the elastic body (3). The back plate (13) may not be disposed on the back surface of the elastic body (3). Of course, it is possible to further increase the support fixing force of the elastic body (3) by arranging the back plate (13) on the back surface of the elastic body (3) and supporting and fixing it with the wider support body (4). It becomes possible.

  In each of the above embodiments, the fuel delivery main body (1) has a flask-shaped cross section perpendicular to the tube axis direction. However, in the fourth embodiment shown in FIG. 8, the fuel delivery main body (1) is flat. The wall (6) and the bottom wall (7) and a pair of arc-shaped side walls (5) connecting them are formed, and the cross-sectional shape is formed into a flat oval shape. And the flat upper wall (6) and the bottom wall (7) are made into the absorber wall surface (2). An elastic body (3) made of an elastomer is disposed in contact with the outer surface of the substantially central portion of the pair of absorber wall surfaces (2). The elastic body (3) also has a steel back plate (13) having rigidity on the back surface thereof. The elastic body (3) is supported and fixed on the surface of the fuel delivery main body (1) by a clamp-like support body (4) having a substantially Ω-shaped side surface.

  In the fourth embodiment, the elastic body (3) is supported and fixed by the clamp-shaped support (4). However, in the fifth embodiment shown in FIG. 9, the fuel delivery is performed by the clip-shaped support (4). The elastic body (3) is supported and fixed by sandwiching the main body (1). Further, in Example 5, the formation width of the clip-like support body (4) is set to the same width as the elastic body (3), and the entire back surface of the elastic body (3) is supported and fixed. The back plate (13) is not disposed on the back surface of the metal plate. However, of course, the back plate (13) may be disposed, and the elastic body (3) can be more firmly supported and fixed.

  In the case of the clamp-like support body (4) as in the fourth embodiment, which is narrower than the elastic body (3), the elastic body (3) is slid to the left and right so that the elastic body (3 ) Can be freely adjusted, resulting in a product with good assembly and layout. Further, in the clip-like support body (4) as in Example 5, since the entire back surface of the elastic body (3) is supported and fixed, the product having high support stability of the elastic body (3) is obtained.

  In the above-described Examples 4 and 5, the elastic body (3) can be formed by the clamping force of the clamp-like or clip-like support (4) and the rigidity when the back plate (13) is provided. The back side is fixed in a passive manner, and the elastic body (3) can be deformed by deformation corresponding to the bending deformation of the absorber wall surface (2). The elastic body (3) does not hinder the bending deformation of the absorber wall surface (2) in the low frequency range, and can satisfactorily suppress pressure pulsation and noise transmission / propagation. On the other hand, for the pulsation in the high frequency range, the elastic body (3) is distorted and deformed, so that the vibration of the absorber wall surface (2) can be attenuated and the sound emission in the high frequency range can be kept small.

  In Examples 1 to 3, a fixed belt-like support (4) is used, and in Examples 4 and 5, a clamp-like or clip-like support that clamps and fixes the fuel delivery body (1) from both sides. (4) is used, and in any case, the support (4) is formed independently of the structural part of the automobile. On the other hand, in Example 6 shown in FIGS. 10 and 11, the bracket (14) for attaching the fuel delivery main body (1) to the vehicle body (17) is also used as the support body (4).

  The bracket (14) has a J-shaped side surface and is provided with a mounting hole (16) for inserting the bolt (15) through one long wall surface. Then, as shown in FIG. 11, two pairs of elastic bodies (3) having a steel back plate (13) disposed and fixed on the back are attached to the upper wall (6) and the bottom wall (7) of the fuel delivery body (1). The elastic body (3) is sandwiched and fixed on the inner surface of the support body (4) which is a J-shaped bracket (14). A bracket (14) sandwiching and fixing the fuel delivery body (1) together with the elastic body (3) is screwed and fixed to the vehicle body (17) with bolts (15) as shown in FIG. Further, as shown in FIG. 11, the bracket (14) has its inner surface on the curved side fixed to one side wall (5) of the fuel delivery body (1) by brazing or welding.

  As described above, by using the bracket (14) as the support (4) of the elastic body (3), the number of parts can be reduced, and the cost can be reduced. Further, since the support body (4) fixed to the vehicle body (17) and the fuel delivery body (1) are fixed by brazing or welding, the fuel is coupled with the clamping force of the support body (4). Not only can the delivery body (1) be stably fixed, but also the support and fixing force of the elastic body (3) by the support body (4) is improved, and the pulsation in the high frequency range is reduced by the elastic body (3). It will be effective.

  Also in Example 6, since the entire back surface of the elastic body (3) is clamped and fixed by the support body (4), the back plate (13) is disposed on the back surface of the elastic body (3). Of course, in this case as well, a back plate (13) may be disposed on the back surface of the elastic body (3) to enable more firm clamping to the elastic body (3).

  Next, in the seventh embodiment shown in FIG. 12, as in the sixth embodiment, the support body (4) comprising the bracket (14) is used and the elastic body (3) is supported and fixed. In contrast to the sixth embodiment in which the elastic body (3) is disposed on the upper wall (6) and the bottom wall (7) of the main body (1), in the seventh embodiment, as shown in FIG. The elastic body (3) is disposed only on the upper wall (6) side. Even in such an embodiment, it is possible to reduce the radiation of sound in a high frequency range, and it is possible to implement at a lower cost. In Example 7, the support (4) is stabilized by fixing both sides of the fuel delivery body (1) on the bottom wall (7) side and the inner surface of the support (4) by brazing or welding. The sex is further enhanced.

  In Example 8 shown in FIG. 13, an elastic body (3) is disposed in contact with one of the wall surfaces (2) of the fuel delivery body (1) having a flask-shaped cross section, and the back surface of the elastic body (3). A back plate (13) is disposed and fixed to the. In order to support and fix the elastic body (3), the plate-like support (4) is fixed to the end of one absorber wall surface (2) by brazing or welding. The elastic body (3) is supported and fixed on the inner surface of the plate-like support (4) via the back plate (13). In this case, only one short elastic body (3) may be disposed on the outer surface of one absorber wall surface (2) and fixed by a narrow support body (4). A plurality of (3) may be provided, and each may be fixed by a narrow support (4).

  Further, a plate-like support body (4) elongated in the tube axis direction is fixed to the fuel delivery main body (1), and a plurality of supports (4) are disposed on the absorber wall surface (2) with this one long support body (4). All of the short elastic bodies (3) arranged individually may be supported and fixed. Alternatively, the elastic body (3) is also formed in a long shape and is disposed over the entire length of one of the absorber wall surfaces (2), and the long elastic body (3) is formed into a long plate-like support. It may be clamped and fixed in (4).

  In the eighth embodiment, the elastic body (3) and the plate-like support (4) are disposed only on one of the absorber wall surfaces (2), but the one and other absorber wall surfaces (2) are elastic. Each elastic body (3) may be supported and fixed by a pair of plate-like supports (4) provided with a body (3) and fixed to both ends of the absorber wall surface (2). . Further, when the elastic body (3) is supported and fixed by the support body (4) having the same width as that of the elastic body (3), sufficient fixing force can be obtained without providing the back plate (13). Inexpensive formation is possible.

  Further, in Example 9 shown in FIG. 14, the fuel delivery body (1) having a flask-shaped cross section is placed horizontally so that both side walls (5) which are a pair of absorber wall surfaces (2) are arranged vertically. Yes. And it is another different Example which fixedly clamped a pair of absorber wall surface (2) from both surfaces with the clip-shaped support body (4) which makes a side shape U shape. In Example 9, the support (4) has the inner surface of the U-shaped bottom part in close contact with the flask-shaped bottom wall (7), and both are fixed by brazing or welding. The clip-shaped support (4) sandwiches and fixes the elastic bodies (3) respectively disposed on the pair of absorber wall surfaces (2).

  In the case of Example 9 as well, a pair or a plurality of short elastic bodies (3) are arranged on each absorber wall surface (2), and each of them is a support body (4) having the same or narrow width as the elastic body (3). Or a plurality of short elastic bodies (3) may be clamped and fixed by a single support (4) that is long in the tube axis direction. Further, the elastic body (3) is formed in a long shape in the tube axis direction, and only one pair is disposed on the absorber wall surface (2), and this long elastic body (3) is attached to a single long support (4 ) May be supported and fixed. When the entire back surface of the elastic body (3) is supported by the support body (4), the support body (4) can be provided without the back plate (13) being disposed and fixed on the back surface of the elastic body (3). Sufficient fixing force can be obtained with just this.

  In any of the above embodiments, when the back plate (13) is disposed and fixed on the back surface of the elastic body (3), the back plate (13) and the support body (4) are brazed or welded. The elastic body (3) can be more firmly supported and fixed by the back plate (13) and the support body (4).

  In the above, an example in which the cross-sectional shape perpendicular to the tube axis direction is a flat or flask-shaped fuel delivery body (1) is shown. Examples 10 to 19 will be described with reference to FIGS. These drawings are conceptual diagrams, the elastic body (3) is shown in a simplified manner, and only the one absorber wall surface (2) is disposed, and the support body (4) is omitted. This support (4) may be provided by any means such as in the first to ninth embodiments.

  Example 10 shown in FIG. 17 is a fuel delivery body (1) having a mortar shape in cross section perpendicular to the tube axis direction, and both side walls (5) bent inward are defined as absorber wall surfaces (2). The elastic body (3) is disposed on one and / or the other of the absorber wall surface (2).

  In Example 11 shown in FIG. 18, both side walls (5) are curved inwardly in an arc shape, and the cross-sectional shape perpendicular to the tube axis direction is trapezoidal. The pair of curved side walls (5) are defined as an absorber wall surface (2), and an elastic body (3) is disposed on one and / or the other of the absorber wall surface (2).

  Example 12 shown in FIG. 19 is a fuel delivery main body (1) having an inverted flask shape with a cross-sectional shape perpendicular to the tube axis direction, and both side walls (5) bent inwardly are formed as absorber wall surfaces (2). The elastic body (3) is disposed on one and / or the other of the absorber wall surface (2).

  A thirteenth embodiment shown in FIG. 20 is a fuel delivery body (1) having a cross-sectional shape perpendicular to the tube axis direction as a mortar shape, and both side walls (5) compared to the mortar shape of the tenth embodiment shown in FIG. An inward bending is formed to form an absorber wall surface (2), and a pair of absorber wall surfaces (2) are arranged in a horizontal shape in the vertical direction. And the elastic body (3) is arrange | positioned to one and / or the other of the absorber wall surface (2).

  Example 14 shown in FIG. 21 is also a fuel delivery body (1) having a mortar shape in cross section perpendicular to the tube axis direction, and a pair of both side walls (5) bent inward are formed as absorber wall surfaces ( 2), and a long straight side is formed at the center. An elastic body (3) is disposed on one and / or the other of the straight sides.

  The embodiment 15 shown in FIG. 22 has a flat shape in which the upper wall (6) and the bottom wall (7) are wide, and the center of the upper wall (6) is bent inward, so that the tube axis direction. A fuel delivery body (1) having a goggle-shaped cross section perpendicular to the cross section. And the upper wall (6) is made into the absorber wall surface (2), and the elastic body (3) is arrange | positioned. When the bottom wall (7) having a straight shape is also an absorber wall surface (2), the elastic body (3) may be disposed on the outer surface of the bottom wall (7).

  Example 16 shown in FIG. 23 is also a fuel delivery main body (1) having a goggle-shaped cross section perpendicular to the tube axis direction in which the center of the upper wall (6) is bent inward. In the sixteenth embodiment, the center of the bottom wall (7) is further bulged outward, and the bottom wall (7) is also an absorber wall surface (2). The elastic body (3) is disposed on the upper wall (6) and / or the bottom wall (7).

  Example 17 shown in FIG. 24 is a fuel delivery main body (1) having a key-shaped cross section perpendicular to the tube axis direction, and both side walls (5) bent inward are defined as absorber wall surfaces (2). The elastic body (3) is disposed on one and / or the other of the absorber wall surface (2). In Example 17, the absorber wall surface (2) is arranged vertically and the fuel delivery body (1) is placed horizontally, but the top wall (6) and the bottom wall (7) are arranged vertically. The fuel delivery body (1) may be placed vertically.

  Example 18 shown in FIG. 25 is a fuel delivery main body (1) having a cross-sectional shape perpendicular to the tube axis direction as a mortar shape. In the fuel delivery main body (1) of Examples 10, 13, and 14, In contrast to the left-right symmetric or vertical-symmetric mortar shape, in the eighteenth embodiment, the left and right are asymmetric mortar shapes. Then, both side walls (5) bent inward are defined as an absorber wall surface (2), and an elastic body (3) is disposed on one and / or the other of the absorber wall surface (2).

  In each of the above Examples 1 to 18, the fuel delivery body (1) without a seam formed from a circular pipe or the like is used, but Example 19 shown in FIG. 26 combines a plurality of molded channel plate materials, A fuel delivery body (1) is formed by connecting and fixing by brazing or welding to form a rectangular cross-sectional shape perpendicular to the tube axis direction. The wide upper wall (6) and the bottom wall (7) are defined as an absorber wall surface (2), and an elastic body (3) is disposed on one and / or the other of the pair of absorber wall surfaces (2).

  In Examples 10 to 19, the support body (4) for supporting and fixing the elastic body (3) may be plate-shaped, clip-shaped, or clamp-shaped, and the bracket (14) may be the support body (4 ). The elastic body (3) and the support body (4) may be formed long in the tube axis direction, or may be a short elastic body (3) and support body (4).

  In each of the above embodiments, when the back plate (13) is disposed and fixed on the back surface of the elastic body (3), the back plate (13) has substantially the same dimensions as the elastic body (3). Yes. However, the longitudinal dimension and / or the lateral dimension of the back plate (13) is formed larger than each dimension of the elastic body (3), and the back plate (13) has a larger area than the elastic body (3). The support fixing force of the support body (4) through the back plate (13) can be evenly distributed on the surface of the elastic body (3), thereby enabling stable support fixing.

  Further, as shown in FIG. 27, a back plate (13) having a U-shaped cross section is disposed and fixed to the elastic body (3), and not only the back surface but also the side surface of the elastic body (3) is back plate (13). The support stability to the elastic body (3) can be further enhanced. The back plate (13) has a U-shaped cross section only in one direction in the vertical direction or the horizontal direction, and the cross-sectional shape in the other direction perpendicular thereto is a straight line. The side surface may be covered. Further, the box-shaped back plate (13) having a U-shaped cross section in both the vertical direction and the horizontal direction may cover four opposing side surfaces of the elastic body (3). However, in any case, in the portion covering the side surface of the elastic body (3), the length of the back plate (13) is formed shorter than the height of the side surface of the elastic body (3), and the back plate (13 ) Does not contact the absorber wall surface (2) so as not to hinder the elastic deformation of the elastic body (3).

  In each of the above embodiments, the rectangular elastic body (3) and the back plate (13) are shown. However, the shape is not limited to this, and the elastic body (3) and the back plate (13) are circular. It may be a geometric shape such as an oval, an ellipse, a triangle, a square, or a pentagon or more polygon, or any other shape.

The conceptual diagram which shows the effect | action of the vibration attenuation | damping by an elastic body in the fuel delivery main body of this invention. The graph which shows the amplitude ratio M when not arrange | positioning with the elastic body arrange | positioned. The conceptual diagram at the time of clamping an elastic body with the support body from both surfaces of the wall surface which a fuel delivery main body opposes. The perspective view of the fuel delivery pipe of Example 1 of this invention. The perspective view of the fuel delivery pipe of Example 2 of this invention. The graph of the measurement experiment of the radiation sound of the fuel delivery main body of Example 2 and Comparative Example 1. FIG. The perspective view of the fuel delivery pipe of Example 3 of this invention. The perspective view of the fuel delivery pipe of Example 4 of this invention. The perspective view of the fuel delivery pipe of Example 5 of this invention. The perspective view of the fuel delivery pipe of Example 6 of this invention. Sectional drawing of elastic body and support body vicinity when the fuel delivery pipe of FIG. 10 is attached to a vehicle body. Sectional drawing of the fuel delivery pipe of Example 7 of this invention. The perspective view of the fuel delivery pipe of Example 8 of this invention. The perspective view of the fuel delivery pipe of Example 9 of this invention. FIG. 3 is a conceptual diagram showing a state in which, in a fuel delivery body having a rectangular cross section perpendicular to the tube axis direction and a flat shape, the inner wall volume of the fuel delivery body changes due to bending of the wall surface of the absorber due to a change in internal pressure. A concept that shows the state in which the internal volume of the fuel delivery body changes due to the change in internal pressure caused by the change in internal pressure in the fuel delivery body fixed by a fixed belt-shaped support with a flask-shaped cross section perpendicular to the tube axis direction Figure. . Sectional drawing of the fuel delivery pipe of Example 10 of this invention. Sectional drawing of the fuel delivery pipe of Example 11 of this invention. Sectional drawing of the fuel delivery pipe of Example 12 of this invention. Sectional drawing of the fuel delivery pipe of Example 13 of this invention. Sectional drawing of the fuel delivery pipe of Example 14 of this invention. Sectional drawing of the fuel delivery pipe of Example 15 of this invention. Sectional drawing of the fuel delivery pipe of Example 16 of this invention. Sectional drawing of the fuel delivery pipe of Example 17 of this invention. Sectional drawing of the fuel delivery pipe of Example 18 of this invention. Sectional drawing of the fuel delivery pipe of Example 19 of this invention. Sectional drawing of the elastic body which coat | covered the back surface and both side wall surface with the back plate.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fuel delivery main body 2 Absorb wall surface 3 Elastic body 4 Support body 10 Fuel introduction pipe 12 Injection nozzle 13 Back plate

Claims (8)

A fuel introduction pipe is connected to a return-less type fuel delivery body that has an injection nozzle and no return circuit to the fuel tank, and this fuel introduction pipe is connected to the fuel tank via the underfloor pipe. In this case, at least one wall surface of the fuel delivery main body is a flexible absorber wall surface, and at least one outer surface of the absorber wall surface is in contact with the inner surface of the absorber wall surface, and is elastically deformed in response to the deflection of the absorber wall surface. An elastic body made of elastomer is arranged, and a support body is arranged on the outer surface of the elastic body so as to abut against and support the elastic body so that the elastic body can be elastically deformed with the wall surface of the absorber. A fuel delivery pipe characterized by 2. The fuel delivery pipe according to claim 1, wherein the elastic body is supported and fixed by a rigid material support having one end fixed to the wall surface of the fuel delivery main body. The elastic body is arranged on the outer surface of at least one of the opposing absorber wall surfaces of the fuel delivery main body, and is sandwiched and fixed by the inner surface of the double-sided support body made of a rigid material that sandwiches and fixes the fuel delivery main body from both opposing surfaces. The fuel delivery pipe according to claim 1, wherein 2. The fuel according to claim 1, wherein the elastic body is sandwiched and fixed on the outer periphery of the fuel delivery main body by a support body formed of a rigid material fixing belt wound in a direction orthogonal to the tube axis of the fuel delivery main body. Delivery pipe. 5. The elastic body according to claim 1, 2, 3, or 4, wherein a back plate having rigidity is disposed on the opposite side of the wall surface of the absorber, and is supported and fixed by a support through the back plate. Fuel delivery pipe. The fuel delivery pipe according to claim 1, 2, 3, 4, or 5, wherein the support is fixed to a structural part of the automobile. 6. The fuel delivery pipe according to claim 1, 2, 3, 4, or 5, wherein the support is formed independently of a structural part of the automobile. The fuel delivery pipe according to claim 1, 2, 3, 4, 5, 6 or 7, wherein the elastic body is compressed in advance between the absorber wall surface and the support body.

Images