JP4173464B2 - 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 to each intake passage of the engine via an injection nozzle. The purpose is to attenuate the vibration of the fuel delivery pipe wall surface, suppress the amplification of sound in all bands including low frequency sound to high frequency sound, and reduce the radiation sound to the outside.

  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 via 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 does not have piping to return excess fuel to the fuel tank, so if the pressure inside the fuel delivery pipe is reduced 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, it will occur 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 Document 1 to Patent Document 6, for the purpose of reducing pressure pulsation, a fuel delivery pipe having a pulsation absorbing function capable of absorbing pressure pulsation has been proposed. 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 the 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 Japanese Patent Laid-Open No. 10-331743

  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 spool of the injection nozzle is seated on a valve seat or the like with the opening and closing of the injection nozzle during fuel injection. There is a problem that a sound with a high frequency of several kHz or more, such as a ticking sound, is amplified by the absorber surface and radiated to the outside.

  In order to reduce this radiated sound, in Patent Document 7, the surface rigidity of the opposing wall surface is increased by a method such as providing a bead on the wall surface facing the wall surface provided with the injection nozzle or joining a circular pipe. Because of this high surface rigidity, when pressure pulsation occurs in the fuel delivery, the fuel delivery pipe is prevented from being greatly bent by this pulsation, and it is tried to suppress high-frequency sound from being radiated. It was.

  However, in the method of providing a bead on the wall surface, it is technically difficult to adjust so that the sound on the high frequency side does not radiate while having the flexibility to suppress the pressure pulsation of the fluid. . Further, when the circular pipes are joined to the planar wall surface, the mutual contact becomes a line contact, and the joining stability is poor. On the contrary, there is a possibility that the high frequency sound will reverberate in the circular pipe.

  The present invention is intended to solve the above-described problems, and not only reduces pressure pulsation during combustion injection by the injection nozzle and prevents generation of vibration and noise in the underfloor piping, but also the spool of the injection nozzle. This suppresses the amplification of sound in all bands including high-frequency sounds such as a ticking sound when seated on a valve seat or the like, and makes it possible to suppress the emitted sound to the outside. In addition, this radiated sound reduction means is formed at low cost without using advanced manufacturing technology or expensive materials, etc., and the increase in bulk and weight due to the reduction means is reduced, and the layout of installation on the vehicle body etc. A fuel delivery pipe with a high degree of freedom is obtained.

  In order to solve the above-mentioned problems, the present invention connects a fuel introduction pipe to a return-less type fuel delivery pipe body that has an injection nozzle and is not provided with a return circuit to the fuel tank, and this fuel introduction pipe is In a fuel delivery pipe connected to a fuel tank via a pipe, at least one wall surface of the fuel delivery pipe body is a flexible absorber wall surface, and the inner or outer peripheral surface and / or non-absorbent wall surface of the absorber wall surface A pair or a plurality of ribs arranged in the vicinity of or in contact with each other in the tube axis direction of the fuel delivery pipe main body are provided on the inner peripheral surface or the outer peripheral surface of the fuel pipe, and vibration of the absorber wall surface caused by fuel injection A pair of ribs abut each other and interfere with the vibration of the non-absorbing wall that vibrates in opposite phase to the vibration, Suppressing deformation of the rib mounting wall is Buzobu wall and / or non Absorb wall, those made by attenuating the vibration of Absorb wall.

  In addition, a pair of ribs are arranged so that two plate members are close to or in contact with each other, and are fixedly connected to the rib mounting wall surface, or one plate member is folded in two, and the bent portion is connected to the rib mounting wall surface. A fixed rib is formed, and a pair of ribs abut against each other and interfere with the vibration of the absorber wall surface and the vibration of the non-absorber wall surface oscillating in a phase opposite to this vibration, thereby forming an absorber wall surface and / or a non-absorbed wall surface. The deformation of the rib mounting wall surface may be suppressed to attenuate the vibration of the absorber wall surface.

  The pair of ribs is a plate-like support rib projecting from the rib mounting wall surface, one end is connected and fixed to the upper end of the support rib so as to face the support rib, and the other end side is not fixed to the rib mounting wall surface. Abutting rib made of a plate-like or linear spring member that presses and urges it, and with the vibration of the absorber wall and the vibration of the non-absorbing wall that vibrates in the opposite phase to this vibration, By causing the abutment force of the abutment rib to act on the support rib in the opposite direction and the pair of ribs interfere with each other, the deformation of the rib wall surface that is the absorber wall surface and / or the non-absorber wall surface is suppressed, and the vibration of the absorber wall surface May be attenuated.

  The pair of ribs may have a length that is 1/2 to 1 of the entire length of the mounting wall surface.

  Further, the pair of ribs may be formed to be shorter than ½ of the mounting wall surface, and a plurality of sets may be arranged in the same direction or spaced apart in the coaxial direction.

  Further, the pair of ribs is formed such that one rib has a length that is 1/2 to 1 of the entire length of the mounting wall surface, and the other rib is shorter than 1/2 of the mounting wall surface, A plurality of them may be arranged in contact with each other at intervals.

  The pair of ribs may have a formation height of 3 mm to 20 mm.

  The pair of ribs may have a total thickness of 2 mm to 4 mm.

  Moreover, you may arrange | position a pair of rib through the gap | interval of 0 mm-1 mm with one rib and the other rib.

  The present invention is configured as described above, and is projected by fuel injection on the inner peripheral surface of the absorber wall surface or the outer peripheral surface of the non-absorbed wall surface that vibrates in a phase opposite to that of the absorber wall surface. Since the pair of ribs abut each other and interfere with each other, the deformation of the rib mounting wall surface is suppressed, and as a result, the vibration of the absorber wall surface is gradually attenuated. Therefore, the sound of all bands including high-frequency sound of several kHz or more, such as a ticking sound that occurs when the spool of the injection nozzle is seated on a valve seat or the like due to fuel injection, may be amplified (speaker phenomenon) by the absorber wall surface. In addition, it is possible to reduce the radiated sound to the outside.

  In addition, such means with a high effect of suppressing radiated sound can be obtained simply by projecting a pair of ribs on the wall surface, so that advanced manufacturing technology and expensive materials are not required, and inexpensive manufacturing is possible. Become. Also, the fuel delivery pipe body with ribs is not excessively bulky compared to pulsation dampers, etc., especially when ribs are provided on the inner peripheral surface of the absorber wall surface, there are no protrusions on the outer surface. , You can get a fuel delivery pipe that does not take up installation space and has a high degree of freedom in layout. In addition, it is not necessary to use a pulsation damper, a vibration absorbing clip, or the like for the underfloor piping, so that the cost of the entire product can be reduced and the flexibility of the layout of other underfloor piping can be improved.

  Hereinafter, embodiments of the fuel delivery pipe of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view of a fuel delivery pipe according to a first embodiment in which a pair of ribs are provided on both side wall surfaces. 2 is a cross-sectional view taken along line AA in FIG. FIG. 3 is a cross-sectional view showing a state where a pair of ribs abut each other and interfere with each other in accordance with the outward deformation of the absorber wall surface in the first embodiment.

  4 to 7 are cross-sectional views of the fuel delivery pipe main bodies of Examples 2 to 5 in which a pair of ribs are provided on the inner peripheral surface of the absorber wall surface. First, in the second embodiment shown in FIG. 4, a pair of ribs are provided in a projecting manner by arranging two plate members close to each other. In Example 3 shown in FIG. 5, one plate member is folded in two to form a pair of ribs. In Example 4 shown in FIG. 6, a fuel delivery pipe body is formed by connecting and fixing a pair of box-shaped metal plates having a U-shaped side surface to each other, and two plate members are provided on the inner peripheral surface of the absorber wall surface. A pair of ribs are provided in close proximity. In Example 5 shown in FIG. 7, a pair of ribs are provided in a projecting manner by placing two part plates bent in an L shape in proximity to each other.

  FIGS. 8 to 12 show Examples 6 to 9 in which a pair of ribs formed by supporting ribs and abutting ribs made of plate-like or linear spring members are projected from the outer peripheral surface of the absorber wall surface. It is sectional drawing or a perspective view of the fuel delivery pipe main body. In Embodiment 6 shown in FIGS. 8 and 9, a pair of ribs is formed by a support rib that is L-shaped on the side and is elongated in the axial direction, and an abutment rib that is a side-arc and is formed of a long plate-like spring member. ing. In Example 7 shown in FIG. 10, a plurality of pairs of ribs formed with side L-shaped support ribs and abutting ribs made of plate-like spring members having a side arc shape and a short length with a gap between them, It arrange | positions in the axial direction center part of the outer peripheral surface of an absorber wall surface. Further, in the eighth embodiment shown in FIG. 11, a plurality of abutting ribs made of linear spring members having an arcuate side surface are connected to a supporting rib that is L-shaped in the side surface and elongated in the axial direction, with a gap therebetween. The rib is formed. Further, in Example 9 shown in FIG. 12, a plurality of abutting ribs made of short plate-like spring members having an arcuate side surface are connected to a supporting rib that is L-shaped in the side surface and long in the axial direction, with a gap therebetween, A pair of ribs are formed.

  Embodiment 1 of the present invention will be described in detail with reference to FIGS. 1 to 3. (1) is a fuel delivery pipe body, which is formed by roll molding, sheet metal press molding, or the like, and a pair of end walls (8) 2, a pair of straight wall surfaces (2) provided between the end walls (8) and a pair of both side walls (3) connecting both ends of the pair of straight wall surfaces (2), as shown in FIG. The flat tube has a rectangular cross-sectional shape perpendicular to the tube axis. In addition, a plurality of sockets (4) are provided on one straight wall surface (2) to connect injection nozzles (not shown). For example, in the case of a four-cylinder engine, four sockets (4) are provided. In the case of an in-line 6-cylinder engine, six sockets (4) are provided at a desired interval and angle.

  The fuel delivery pipe main body (1) is connected to a fuel introduction pipe (not shown) at one end, and this fuel introduction pipe is connected to a fuel tank (not shown) via an underfloor pipe (not shown). Has been. The fuel in the fuel tank is transferred to the fuel introduction pipe via the underfloor pipe, flows from the fuel introduction pipe to the fuel delivery pipe body (1), and is injected into the engine via the injection nozzle connected to the socket (4). The fuel is directly injected into the intake passage or the cylinder. Further, most of the fuel delivery pipe main body (1) is provided with a bracket (not shown) for connecting and fixing the fuel delivery pipe main body (1) to the engine main body on the attachment side of the socket (4).

  Then, one and the other straight wall surface (2) are formed so as to be able to bend and deform by the pulsation of the fluid accompanying fuel injection, thereby forming an elastic wall surface (5) having flexibility. Further, two plate members having substantially the same length as the both side walls (3) are arranged close to each other through a minute gap (6) in the central portion in the axial direction of the outer peripheral surface of the pair of both side walls (3). This plate member is connected and fixed to both side walls (3) by brazing or welding, and a pair of ribs (7) is projected in pairs, one on each side of the fuel delivery pipe body (1). Since these ribs (7) have one side surface of the long plate member in contact with the mounting wall surface and are fixed by a brazing material or a melted metal fillet (10), the rib (7) is connected to the mounting wall surface. Strength can be increased. Accordingly, the durability of the rib (7) is improved, and the effect of damping the wall vibration by the rib (7) described later can be maintained for a long time.

  In addition, on both side walls (3), which are non-absorptive wall surfaces, an inward deformation force acts along with the outward deformation of the absorptive wall surface (5). Due to the outward deformation force acting along with the bending deformation, both side walls (3) vibrate in opposite phase to the absorber wall surface (5). Accordingly, the pair of ribs (7) projecting from the outer peripheral surfaces of the both side walls (3) are deformed outwardly of the absorber wall surface (5) as shown in FIG. ) Abut each other and interfere with each other at opposite phases, and the pair of ribs (7) are displaced away from each other with the inward deformation of the absorber wall surface (5).

  In the first embodiment and each of the embodiments described later, the formation length, the formation height, the plate thickness, etc. of the pair of ribs (7) may be any suitable dimensions, but the fuel delivery pipe body (1) It is preferable to form in consideration of the dimensions, storage space, cost and the like. For this reason, the formation length of the pair of ribs (7) is preferably ½ to 1 of the entire length of the mounting wall surface. If the formation length of the rib (7) is shorter than ½, the vibration absorption effect may be reduced, and the radiation sound reduction effect may be reduced. However, the length is not necessarily ½ or more, and the rib (7) may be shorter than ½ of the entire length of the mounting wall surface. For example, as in the seventh embodiment shown in FIG. 10, by providing a plurality of pairs of short ribs (7) in the fuel delivery pipe body (1), the vibration absorption effect is enhanced and the radiated sound is effectively obtained. It can also be reduced. On the other hand, if the length of the rib (7) is longer than the mounting wall surface, the fuel delivery pipe body (1) is bulky and storage capacity is reduced, resulting in wasted material and an effect of reducing radiated sound. Does not improve. When the rib (7) is formed long, the long rib (7) may not be in contact with the entire length due to vibration of the absorber wall surface (5) and other conditions. However, even a part of the ribs (7) can be brought into contact with each other, so that a sufficient damping effect of the vibration of the absorber wall surface (5) can be obtained.

  Moreover, it is preferable that the formation height of a pair of rib (7) shall be 3-20 mm. If the formation height of the rib (7) is lower than 3 mm, the ribs (7) do not interfere with each other, or the interference action of the rib (7) is too small compared with the vibration force of the absorber wall surface (5), etc. Thus, the vibration absorption effect is reduced. Further, even if the formation height of the rib (7) is higher than 20 mm, there is no significant difference in the vibration damping effect, and the material cost increases and the cost increases. When the rib (7) is provided outside, the fuel delivery pipe main body (1) is wide or bulky to reduce the storage efficiency. When the rib (7) is provided inside, the rib (7 ) Abuts against the opposing inner peripheral wall surface of the fuel delivery pipe main body (1), causing problems such as inhibiting interference between the ribs (7).

  The pair of ribs (7) preferably has a total thickness of 2 to 4 mm. If the total thickness is less than 2 mm, the pair of ribs (7) becomes fragile, deforms due to the impact at the end of each other, and the vibration damping effect due to interference between the ribs (7) is obtained. Disappear. Also, if the total thickness is greater than 4 mm, the absorber wall (5) may interfere with the bending deformation necessary for absorbing pressure pulsation, and the weight and bulk of the fuel delivery pipe body (1) will increase. It becomes difficult to make the fuel delivery pipe body (1) compact and lightweight.

  Moreover, it is preferable that a pair of rib (7) arrange | positions one rib (7) and the other rib (7) through the gap (6) of 0 mm-1 mm. Even when the gap (6) is 0 mm, that is, when the pair of ribs (7) are disposed in contact with each other, the ribs (7) strongly abut against each other as the absorber wall surface (5) is bent, Interfering with each other, it is possible to attenuate wall vibration. Further, if the gap (6) between the pair of ribs (7) is larger than 1 mm, the ribs (7) do not come into contact with each other even at the maximum bending deformation of the absorber wall surface (5). Interference may not be performed.

  In the fuel delivery pipe of the first embodiment as described above, the inside of the fuel delivery pipe body (1) is suddenly depressurized by the fuel injection from the engine intake pipe or the injection nozzle to the cylinder, or the pressure wave is generated by stopping the fuel injection. When pressure pulsation occurs inside the fuel delivery pipe body (1), the pressure pulsation is absorbed by the deformation of the absorber wall surface (5) to change the internal volume, thereby transmitting pressure pulsation and noise.・ Propagation is suppressed.

  In addition, along with the bending deformation of the absorber wall surface (5), two sets of ribs (7) provided on both side walls (3) that vibrate in the opposite phase to the vibration of the bending deformation of the absorber wall surface (5), Interference occurs by repeating contact and separation. By suppressing the deformation of the side walls (3) projecting the rib (7) by the reaction force of this interference, the vibration is gradually attenuated, and consequently the vibration of the absorber wall (5) is also attenuated. It becomes. Due to the damping of the vibration of the wall surface (5) of the absorber, the wall surface (5) of the absorber is vibrated by high-frequency sound of several kHz or more, such as a ticking sound generated when the spool of the injection nozzle is seated on the valve seat or the like after fuel injection. Therefore, the high frequency sound is not amplified. And not only this high frequency sound but the radiation of the sound of all the bands including a low frequency sound etc. to the exterior can be suppressed small.

  In addition, such means for reducing the radiated sound can be formed simply by connecting and fixing the rib (7) to the wall surface of the fuel delivery pipe body (1) by brazing or welding. Expensive materials are not required, and expensive silencing parts such as pulsation dampers and vibration absorbing clips need not be used. Therefore, it is possible to obtain a fuel delivery pipe at a low price, and it is possible to obtain a product that is less bulky, suppresses an increase in weight, is compact and lightweight, does not take up storage space, and has a high degree of freedom in layout. .

  In the first embodiment, two pairs of ribs (7) are provided on the outer peripheral surface of both side walls (3), which are non-absorbing wall surfaces. However, in the second embodiment shown in FIG. A pair of ribs (7) are projected from the inner peripheral surface of the absorber wall surface (5) on the forming side. Also in this case, one rib (7) and the other rib (7) are arranged close to each other through a minute gap (6), and are connected and fixed to the inner peripheral surface of the absorber wall surface (5) by brazing or welding. ing. Further, in this embodiment, the socket (4) is connected to a position separated from the central portion as shown in FIG. 4 so that the pair of ribs (7) and the socket (4) do not interfere with each other. Of course, when the distance between the mounting wall surface of the pair of ribs (7) and the mounting wall surface of the socket (4) is sufficiently wide and there is no possibility that the rib (7) and the socket (4) interfere, the rib (7 ) And the socket (4) may be provided in the central portion.

  In the configuration of the second embodiment, the ribs (7) abut against each other and interfere with the outward deformation of the absorber wall surface (5), and the ribs (7) come together with the restoration of the absorber wall surface (5). Are separated. As described above, the ribs (7) interfere with each other along with the vibration of the wall surface (5), so that the vibration of the wall surface (5) is gradually attenuated. The vibration of the absorber wall surface (5) due to sound can be prevented, and the emission of sounds in all bands including low frequency sounds to high frequency sounds can be suppressed as in the first embodiment. Further, by providing the rib (7) in the internal space of the fuel delivery pipe main body (1), the bulk of the fuel delivery pipe main body (1) can be reduced, and the degree of freedom in layout is further improved. It will be a thing.

  In Example 1 and Example 2, two plate members are arranged close to each other to form a pair of ribs (7). However, in Example 3 shown in FIG. 5, one plate member is folded. Folded in two via the bent portion (11), the surfaces of the folded pieces are placed in contact with each other, and the bent portion (11) is connected and fixed to the inner peripheral surface of the absorber wall surface (5) by brazing or welding. Thus, a pair of ribs (7) is formed.

  Even in such a configuration, when the absorber wall surface (5) is bent outwardly, the pair of ribs (7) provided on the inner peripheral surface interfere with each other by increasing the mutual contact force. Further, the outward deformation of the absorber wall surface (5) is suppressed, and the vibration of the absorber wall surface (5) is attenuated. Thereby, amplification of the high frequency sound etc. by an absorber wall surface (5) can be prevented, and the radiation | emission to the exterior of the sound of all the bands from a low frequency sound to a high frequency sound can be suppressed. In addition, since only the bent portion (11) of the plate member folded in half is connected and fixed to the absorber wall surface (5), the number of brazing and welding processes is reduced, and the pair of ribs (7) are aligned. It is not necessary to carry out the process, and easy production is possible. In the third embodiment, the pair of ribs (7) are brought into contact with each other without providing a gap (6). However, the plate member is bent into a U-shape, a U-shape, or the like to form a pair of ribs (7). An appropriate gap (6) may be provided between them, and the contact area between the rib (7) and the mounting wall surface increases, and the connection stability can be improved.

  In Example 4 shown in FIG. 6, a fuel delivery pipe main body (1) is formed by connecting and fixing a pair of metal plate members having a U-shaped cross section and a box shape. Then, two plate members are arranged close to each other on the inner peripheral surface of the absorber wall surface (5) and are fixedly connected, and a pair of ribs (7) are projected. By thus forming the fuel delivery pipe main body (1) with two members, it becomes easy to connect and fix the rib (7) to the inner peripheral surface of the absorber wall surface (5).

  In Example 5 shown in FIG. 7, a pair of ribs (7) are formed by arranging two part plates bent in an L-shape in close proximity, and one of the folded pieces is formed on the inner peripheral surface of the absorber wall surface (5). They are brought into surface contact and connected and fixed by brazing or welding. In this way, each rib (7) can be L-shaped and connected and fixed to the absorber wall surface (5) with a wide contact area, and the fixing stability of the pair of ribs (7) can be further improved. .

  In each of the above embodiments, the pair of ribs (7) is formed only by the plate member. However, in Example 6 shown in FIGS. 8 and 9, the support rib (12) made of a side L-shaped plate member, A pair of ribs (7) is formed by the abutting rib (13) made of a plate-like spring member having an arcuate side surface. First, a support rib (12) that is L-shaped in the side surface and is elongated in the axial direction is connected and fixed to the center of the outer peripheral surface of the absorber wall surface (5) by brazing or welding. Then, a long abutting rib (13) having a circular arc shape is pressed between the support rib (12) and the absorber wall surface (5), and the support rib (12) and the absorber wall surface (5) are pressed and urged. One end of the abutment rib (13) is connected and fixed to the upper end of the support rib (12) by brazing or welding, and the other end of the abutment rib (13) is connected to the outer peripheral surface of the absorber wall surface (5). In a non-fixed manner, it is abutted by a biasing force. By this non-fixed contact, the other end of the abutment rib (13) can be appropriately moved in the width direction on the surface in accordance with the deformation of the absorber wall surface (5).

  In such a rib (7), when an inward bending deformation of the absorber wall surface (5) occurs, the absorber wall surface (5) tries to compress the abutting rib (13). A strong abutment force (restoring force) of the abutment rib (13) acts on the opposing direction in (12), and the reaction between the support rib (12) and the abutment rib (13) interferes with the absorber wall surface (5 ) Inward deformation is suppressed. Further, when the outward deformation of the absorber wall surface (5) occurs, the absorber ribs (13) biased against the absorber wall surface (5) and the friction force between the absorber wall surface (5) and the absorber wall surface (5) The outward deformation of the wall surface (5) is suppressed, and the vibration of the absorber wall surface (5) can be gradually attenuated. Therefore, amplification of high frequency sound and the like by the absorber wall surface (5) is suppressed, and radiation of sound in all bands from low frequency sound to high frequency sound can be suppressed to a low level.

  In the sixth embodiment, only a pair of ribs (7) including a long support rib (12) and a long abutting rib (13) are provided. In the seventh embodiment shown in FIG. A pair of ribs (7) consisting of an L-shaped short support rib (12) and a side surface circular arc-shaped abutting rib (13) made of a plate-like spring member is formed at the center of the absorber wall surface (5). A plurality of sets are arranged on a straight line with a desired interval. In this case, by disposing the ribs (7) at the positions facing the socket (4), the vibration of the absorber wall surface (5) at the facing portion of each socket (4) is attenuated, and each socket (4) Amplification of not only high-frequency sound generated when the spool of the injection nozzle connected to the valve seat is seated on a valve seat or the like but also low-frequency sound and the like can be satisfactorily prevented. Of course, even when the rib (7) is provided at the non-opposing position of the socket (4), the vibration of the absorber wall surface (5) is attenuated, and the sound of all bands including low frequency sound to high frequency sound is attenuated. It is possible to suppress the radiation to the outside of the chamber.

  Further, in Example 8 shown in FIG. 11, only one side-shaped long support rib (12) is connected and fixed to the absorber wall surface (5), and a side circle is attached to the long support rib (12). A plurality of abutting ribs (13) made of arcuate linear spring members are connected at intervals to constitute a pair of ribs (7). Even with such a rib (7), the vibration of the absorber wall surface (5) is attenuated by the interference between the support rib (12) and the abutting rib (13), and the radiated sound can be reduced. Further, by using a linear spring member for the abutting rib (13), the material cost can be reduced and the rib (7) can be simplified.

  Further, in the ninth embodiment shown in FIG. 12, the side L-shaped long support rib (12) connected and fixed to the outer peripheral surface of the absorber wall surface (5) is provided with a protrusion made of a short plate spring member having an arcuate side surface. A plurality of the ribs (13) are connected to each other with a gap therebetween to constitute a pair of ribs (7).

  Even in the ribs (7) as in the eighth embodiment and the ninth embodiment, the vibration of the absorber wall surface (5) is attenuated by the interference between the support rib (12) and the abutting rib (13), and the radiated sound. Can be reduced. Further, by making the support rib (12) long, the support to the abutment rib (13) can be stably performed. Further, by using a linear spring member or a short plate spring member for the abutting rib (13), the cost of the product can be reduced.

  Further, in Examples 6 to 9 shown in FIGS. 8 to 12, ribs (7) including support ribs (12) and abutting ribs (13) are provided on the outer peripheral surface of the absorber wall surface (5). However, as another different embodiment, the rib (7) having the shape as in Embodiments 6 to 9 may be provided on the inner peripheral surface of the absorber wall surface (5). In this case as well, it is possible to attenuate the vibration of the absorber wall surface (5) by the rib (7) to suppress the emission of sound in all bands from low frequency sound to high frequency sound, and to reduce the bulky product. I can get it.

The perspective view of the fuel delivery pipe of Example 1 of this invention. AA sectional view taken on the line AA of FIG. Sectional drawing which shows the interference state of a pair of rib. Sectional drawing of the fuel delivery pipe of Example 2 of this invention. Sectional drawing of the fuel delivery pipe of Example 3 of this invention. Sectional drawing of the fuel delivery pipe of Example 4 of this invention. Sectional drawing 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. BB sectional drawing of FIG. The perspective view 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.

Explanation of symbols

1 Fuel Delivery Pipe Body 5 Absorber Wall 7 Rib 12 Support Rib 13 Abutting Rib

Claims (9)

A fuel delivery pipe connected to a fuel tank via an underfloor pipe and a fuel introduction pipe connected to the body of a returnless type fuel delivery pipe with an injection nozzle and no return circuit to the fuel tank In this case, at least one wall surface of the fuel delivery pipe body is a flexible absorber wall surface, and a fuel delivery pipe is provided on the inner peripheral surface or outer peripheral surface of the absorber wall surface and / or the inner peripheral surface or outer peripheral surface of the non-absorbent wall surface. One or more pairs of ribs arranged close to or in contact with each other in the tube axis direction of the main body project, and vibration of the absorber wall surface due to fuel injection and vibration of the non-absorbent wall surface that vibrates in the opposite phase to this vibration As a result of the pair of ribs striking and interfering with each other, the absorber wall surface and / or the non-absorber wall Fuel delivery pipe to suppress the deformation of the rib attachment wall, characterized in that damping vibrations of Absorb wall is. A pair of ribs are arranged by adjoining or abutting two plate members and connected and fixed to the rib mounting wall surface, or one plate member is folded in two, and the bent portion is connected and fixed to the rib mounting wall surface. Attaching ribs that are an absorptive wall surface and / or a non-absorptive wall surface by a pair of ribs abutting and interfering with the vibration of the absorptive wall surface and the vibration of the non-absorbing wall surface that vibrates in the opposite phase to this vibration 2. The fuel delivery pipe according to claim 1, wherein deformation of the wall surface is suppressed and vibration of the absorber wall surface is attenuated. The pair of ribs are plate-like support ribs protruding from the rib mounting wall surface, one end is connected and fixed to the upper end of the support rib so as to face the support rib, and the other end side is not fixed to the rib mounting wall surface. The support ribs are made of abutment ribs made of plate-like or linear spring members that are brought into contact with each other to press and urge them. By causing the abutment force of the abutment rib to act in the opposite direction and the pair of ribs interfering with each other, the deformation of the rib wall surface that is an absorptive wall surface and / or a non-absorbent wall surface is suppressed, and the vibration of the absorptive wall surface is attenuated The fuel delivery pipe according to claim 1 or 2, characterized in that: The fuel delivery pipe according to claim 1, 2 or 3, wherein the pair of ribs has a length that is 1/2 to 1 of a total length of the mounting wall surface. The fuel delivery pipe according to claim 1, 2 or 3, wherein the pair of ribs are formed to be shorter than ½ of the mounting wall surface, and a plurality of sets are arranged in the same direction or spaced apart in the coaxial direction. . The pair of ribs is formed such that one rib has a length of 1/2 to 1 of the total length of the mounting wall surface, and the other rib is shorter than 1/2 of the mounting wall surface, and the other rib is close to or abuts with the one rib. 4. The fuel delivery pipe according to claim 1, wherein a plurality of fuel delivery pipes are arranged at intervals. The fuel delivery pipe according to claim 1, 2, or 3, wherein the pair of ribs has a height of 3 mm to 20 mm. The fuel delivery pipe according to claim 1, 2, 3, 4, 5, 6 or 7, wherein the pair of ribs has a total thickness of 2 mm to 4 mm. The fuel delivery pipe according to claim 1, 2, 3, 4, 5, 6, 7 or 8, wherein the pair of ribs are arranged such that one rib and the other rib are disposed with a gap of 0 mm to 1 mm.

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