JP4440184B2 - Fuel delivery pipe for engine start - Google Patents

Description

  The present invention relates to an engine start fuel delivery pipe used when starting an engine in an electronic fuel injection type automobile engine.

  2. Description of the Related Art Conventionally, a fuel delivery pipe that uses a plurality of injection nozzles and supplies fuel such as gasoline to a plurality of cylinders of an engine has been used. 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, mixes it with air, and burns this mixture Is generating engine output.

Among such fuel delivery pipes, as in the invention shown in Patent Document 1, a plurality of communication ports are opened in a substantially rectangular tube body to form a communication tube, and an injection nozzle is provided at the communication port of the communication tube. Conventionally, a socket for attaching and fixing one end of a socket has been used.
JP 2003-314405 A

  However, in recent years, in addition to gasoline as a fuel for an electronic fuel injection type automobile engine, a low-boiling liquid fuel having a boiling point lower than that of gasoline such as ethyl alcohol or methyl alcohol is used alone or as an alternative fuel for this gasoline, or It has been used as a liquid fuel mixture with gasoline, and gas fuels such as LPG and CNG have come to be used.

  Therefore, when a low-boiling liquid fuel is used alone or as a liquid fuel mixture with gasoline, the fuel delivery pipe is connected due to radiant heat from the engine when the engine stops once, or when the outside air temperature rises. When the temperature in the pipe becomes higher than the boiling point of the liquid fuel, a part of the low boiling liquid fuel is vaporized, and the volume of the liquid fuel or the liquid mixed fuel in the communication pipe is reduced. In addition, in a gas fuel engine, startability is always inferior to that in an engine using gasoline alone.

  Accordingly, in such a case, when the fuel delivery pipe as in the invention described in Patent Document 1 is used, the ratio of the volume of the liquid fuel in the communication pipe to the internal volume of the communication pipe is reduced, and cranking for engine start is performed. Sometimes, it is difficult to quickly and smoothly supply the liquid fuel from the communication pipe to the cylinder of the engine, and the response at the time of starting the engine may be poor.

  An object of the present invention is to provide a fuel delivery pipe for starting an engine that can quickly and smoothly supply liquid fuel from a communication pipe to an intake pipe or a cylinder of the engine when starting the engine. I want to get it.

  In order to solve the above-described problems, the present invention uses one end of the pipe member as a connection part of the liquid fuel introduction pipe, and leaves one side and / or the other side of the pipe member leaving the liquid fuel passage from the connection part to the other end. By crushing in the axial direction and forming a side flat portion, a liquid fuel passage having an inner diameter smaller than the inner diameter of the connection portion is formed, and the other end of the tube member is crushed to form a sealed portion. A communication pipe having a plurality of communication openings opened on a wall surface forming the liquid fuel passage, and a plurality of sockets for connecting one end to the communication opening of the communication pipe and mounting an injection nozzle. .

  The communication pipe may be provided with a bent piece obtained by bending the side flat portion in the axial direction.

  Further, the socket may be one in which one end is directly connected to the communication port of the communication pipe.

  Further, the socket may be connected to a communication port of the communication pipe via a connection pipe.

  The liquid fuel passage may have the same inner diameter from one end to the other end.

  In addition, the liquid fuel passage may have a large inner diameter on one end side that is a connection portion side of the communication pipe and a smaller inner diameter on the other end side.

  Since the present invention is configured as described above, a side flat portion and a sealed portion are formed in the communication pipe, and a liquid fuel passage having an inner diameter smaller than the inner diameter of the connection portion with the liquid fuel introduction pipe is formed. This narrows the flow path of the liquid fuel in the communication pipe. Even if a low-boiling liquid fuel having a boiling point lower than that of gasoline is used alone or mixed with gasoline as a mixed liquid fuel, or even in the case of a gas engine, the communication pipe inside the communication pipe can be used. It is possible to suppress a decrease in the volume ratio of the liquid fuel, and even when gasoline is used alone, the gasoline can be circulated quickly in the communication pipe. Therefore, when starting the engine, liquid fuel can be supplied quickly and smoothly from the communication pipe to the cylinder of the engine, and the responsiveness can be improved. Therefore, it is possible to improve the startability of the engine.

  1 to 5, the first embodiment of the present invention will be described in detail. As shown in FIG. 1, (1) is a communication pipe, which is formed of a cylindrical pipe member as a material. One end side of this pipe member is used as a connection part (2) of a liquid fuel introduction pipe (not shown), and the pipe is left leaving a liquid fuel passage (3) having a small cross-sectional area from the connection part (2) to the other end. A pair of lateral flat portions (4) are formed symmetrically by squeezing both sides of the member continuously in the horizontal direction in the axial direction.

  Therefore, as shown in FIG. 4, side flat portions (4) are formed on both sides of the liquid fuel passage (3). And by forming a pair of side flat parts (4) on both sides of the pipe member in this way, the inner diameter of the liquid fuel passage (3) is made much smaller than the inner diameter of the connection part (2). be able to. Further, the other end side of the tube member is crushed and brazed or the like to seal the other end to form a sealed flat portion (5). In this way, by forming the sealed flat portion (5) on the other end side of the pipe member, it is possible to prevent the liquid fuel flowing through the liquid fuel passage (3) from leaking.

  As described above, the connection part (2) of the liquid fuel introduction pipe is provided at one end, and both sides and the other end of the pipe member are crushed to form a pair of side flat parts (4) and a sealed flat part (5). Thus, the communication pipe (1) in the first embodiment is configured. Therefore, by forming the liquid fuel passage (3) in which the inner diameter of the communication pipe (1) is much smaller than the inner diameter of the connection part (2) with the liquid fuel introduction pipe, the liquid in the communication pipe (1) is formed. The fuel flow path can be narrowed.

Therefore, when a low boiling liquid fuel having a lower boiling point than gasoline is used alone or mixed with gasoline as a mixed liquid fuel, the liquid fuel in the communication pipe (1) with respect to the internal volume of the communication pipe (1) is reduced. It is possible to suppress a decrease in the volume ratio. Further, even when gasoline is used alone, it is possible to quickly distribute the gasoline in the communication pipe (1). Therefore, when the engine is started, liquid fuel can be supplied quickly and smoothly from the communication pipe (1) to the intake pipe or cylinder of the engine, and the responsiveness is improved. In the present invention has a cross-sectional area of the liquid fuel passage (3) and 2 mm ² or more on.

The wall surface (6) forming the liquid fuel passage (3) of the communication pipe (1) has a flat bottom wall (8) side on the connection side of the socket (7) as shown in FIG. (11) is formed in a cross-section kamaboko shape curved in an arc shape. In addition, at the center in the width direction of the bottom wall (8), four communication ports (10) for directly connecting the socket (7) are opened at a desired interval in the axial direction. Further, as shown in FIG. 5, in the liquid fuel passage (3), the inner diameter at the position corresponding to the formation position of the communication port (10) is increased so as to be larger than the inner diameter at other positions. A bulging portion (20) is formed, and the cross-sectional shape of the bulging portion (20) is substantially triangular.

  Further, as shown in FIGS. 2 and 3, sockets (7) for mounting injection nozzles (not shown) are connected to the communication ports arranged on the bottom wall (8) as described above. . That is, one end opposite to the connection side of the injection nozzle is inserted into the communication port (10), the socket (7) is connected and fixed to the communication port (10), and the communication tube is connected to the communication port (10). A fuel introduction port (12) formed at the upper end of the socket (7) is arranged inward of (1). Further, as shown in FIG. 3, one bracket (13) is connected and arranged on each of the one end side and the other end side of the communication pipe (1).

Then, Oite this way socket (7) communicating pipe was connected to (1), an inner diameter of a position corresponding to the forming position of the communication port (10) of the liquid fuel passage as described above (3), the other The liquid fuel from the liquid fuel passage (3) to the fuel inlet (12) of the socket (7) is formed by expanding the diameter so as to be larger than the inner diameter of the position, thereby forming the bulging portion (20). Therefore, the liquid fuel can be efficiently circulated from the liquid fuel passage (3) to the fuel inlet (12) of the socket (7).

  Then, after the engine is started using the engine start fuel delivery pipe of the present invention formed as described above, the conventional fuel delivery pipe installed separately from the engine start fuel delivery pipe of the present invention is used. The engine is sequentially injected from a plurality of injection nozzles into a plurality of intake pipes or cylinders of the engine and mixed with air, and the mixture is burned to generate engine output.

  Moreover, in the said Example 1, the side flat part (4) extended in the horizontal direction from the both sides of the liquid fuel channel | path (3) in cross-sectional shape is formed by crushing both sides of a pipe member in a horizontal direction. However, in the second embodiment of the present invention, as shown in FIG. 6, one side flat portion (4) of the pair of side flat portions (4) formed in the same manner as in the first embodiment is connected to the communication pipe ( A bent piece (15) is formed by bending the edge (14) of the side flat portion (4) upward along the axial direction of the communication pipe in the axial direction of 1).

  By forming the bent piece (15) in the side flat portion (4) in this way, it becomes possible to increase the rigidity of the communication pipe (1), so that the fuel delivery for starting the engine is more stable. You can get a pipe.

  Further, in the second embodiment, as shown in FIG. 6, the bent piece (15) is formed only on one side flat portion (4), but in the third embodiment of the present invention, as shown in FIG. In this way, the bent pieces (15) are formed on both side flat portions (4). Thus, the rigidity of the communication pipe (1) can be further increased by forming the bent pieces (15) in both the side flat portions (4).

  In the first embodiment, the pair of side flat portions (4) are arranged on both sides of the communication pipe (1). However, in the fourth embodiment of the present invention, as shown in FIG. By crushing only the side, the side flat portion (4) is disposed only on one side of the communication pipe (1). Therefore, the side flat portion (4) is disposed only on one side of the liquid fuel passage (3). By forming the side flat portion (4) only on one side of the communication pipe (1) in this way, manufacturing can be facilitated.

  In the fourth embodiment, only one side of the pipe member is crushed in the horizontal direction, thereby forming a side flat portion (4) extending in the horizontal direction from one side of the liquid fuel passage (3) in the cross-sectional shape. However, in the fifth embodiment of the present invention, as shown in FIG. 9, the lateral flat portion (4) formed in the same manner as in the fourth embodiment is laterally flat in the axial direction of the communication pipe (1). A bent piece (15) is formed by bending the end edge (14) of the portion (4) upward along the axial direction of the communication pipe (1).

In the fourth embodiment, the side flat portion (4) is formed and arranged on one side of the communication pipe (1), and the socket (7) is connected in a direction perpendicular to the protruding direction of the side flat portion (4). However, in Embodiment 6 of the present invention, as shown in FIG. 10, a side flat portion (4) is formed on one side of the communication pipe (1), and the side flat portion (4) is formed into a liquid. It is arranged vertically above the fuel passage (3), and the socket (7) is connected to the wall surface (6) on the opposite side of the side flat portion (4) from the arrangement side. Further, a communication port (10) is opened at a position opposite to the side where the side flat portion (4) of the liquid fuel passage (3) is disposed, and a socket (7) is connected and fixed to the communication port (10). ing.

  Further, in the sixth embodiment, as shown in FIG. 10, the side flat portion (4) extending in the vertical direction from the liquid fuel passage (3) is formed in the cross-sectional shape, but in the seventh embodiment of the present invention, As shown in FIG. 11, a bent piece (15) is formed by bending the edge (14) of the side flat portion (4) in one direction along the axial direction of the communication pipe (1). Yes. Therefore, the rigidity of the communication pipe (1) can be further increased.

  In the first embodiment, the socket (7) is directly connected and fixed to the communication port (10) formed in the communication pipe (1). However, in the eighth embodiment of the present invention, as shown in FIG. A socket (7) is connected to the communication port (10) of the pipe (1) through a connecting pipe (16). That is, one end of a cylindrical connection pipe (16) is fixed to the communication port (10) by brazing or the like, and the connection pipe (16) is connected and arranged in a direction perpendicular to the axial direction of the communication pipe (1). At the same time, one end of the socket (7) is connected and fixed to the other end of the connecting pipe (16) by brazing or the like.

  Moreover, in the said Examples 1-8, although the internal diameter of the liquid fuel channel | path (3) of a communicating pipe (1) is made into the same diameter from one end to the other end except the formation part of a bulging part (20), In the ninth embodiment of the invention, as shown in FIGS. 13 and 14, the inner diameter of the liquid fuel passage (3) excluding the portion where the bulging portion (20) is formed is on the connection portion (2) side of the liquid fuel introduction pipe. The one end side is formed in a tapered shape with a large diameter and the other end side with a small diameter. In this way, the liquid fuel passage (3) excluding the formation portion of the bulging portion (20) is tapered, so that the liquid fuel can be quickly supplied to the tip of the liquid fuel passage (3) without reducing the pressure. It becomes possible to transfer to.

  Further, in the ninth embodiment, the inner diameter of the liquid fuel passage (3) excluding the portion where the bulging portion (20) is formed has a large diameter at one end side which is the connecting portion (2) side and the other end side. Is formed in a taper shape with a small diameter, and the inner diameter of the liquid fuel passage (3) is continuously changed in the axial direction of the communication pipe (1). In the tenth embodiment of the present invention, FIGS. As shown in FIG. 3, the liquid fuel passage (3) has the same inner diameter at the interval between the adjacent communication ports (10), the inner diameter of the liquid fuel passage (3) on one end side is larger, and the one end side and the other end The inner diameter of the intermediate portion between the two sides is smaller than the inner diameter of one end side, the inner diameter of the other end side is smaller than the inner diameter of the intermediate portion, and the inner diameter of the liquid fuel passage (3) is the communication pipe ( It is changed stepwise in the axial direction of 1).

  In the eleventh embodiment, as shown in FIGS. 17 and 18, a plurality of communication ports (10) are opened in the axial direction below the communication tube (1) formed in a cylindrical shape, and the communication port (10). One end of a cylindrical connecting pipe (16) is fixed to the pipe, and the connecting pipe (16) is connected and arranged in a direction perpendicular to the axial direction of the connecting pipe (1), and is connected to the other end of the connecting pipe (16). Is connected and fixed to one end of the socket (7). Also, one side surface of the flat plate (17) having a length substantially the same as the formation length of the communication pipe (1) is brazed continuously in the axial direction of the communication pipe (1) above the communication pipe (1). The connection is fixed. In this way, by connecting and fixing the flat plate (17) above the communication pipe (1), the rigidity of the fuel delivery pipe for starting the engine is increased, and a stable product can be obtained.

  In the eleventh embodiment, the flat plate (17) is connected and fixed above the communication pipe (1). However, in this twelfth embodiment, as shown in FIG. 19, the communication of the cylindrical communication pipe (1) is performed. One end of the connecting pipe (16) is disposed at the port (10), and the socket (7) is connected and fixed to the other end of the connecting pipe (16), and a plate material having substantially the same length as the communicating pipe (1) ( 18) is installed on one side of the connecting pipe (16) in parallel with the communicating pipe (1), and the contact portion between the plate member (18) and the connecting pipe (16) is connected and fixed by brazing or the like. Yes. As described above, the rigidity of the engine start fuel delivery pipe can be increased by connecting and fixing the plate material (18) to each connecting pipe (16) in the axial direction of the communication pipe (1). .

The perspective view of the communicating pipe which shows Example 1 of this invention. Sectional drawing of the fuel delivery pipe for engine starting of Example 1. FIG. 1 is a front view of a socket connection side of an engine start fuel delivery pipe according to Embodiment 1. FIG. FIG. 3 is a cross-sectional view taken along line AA in FIG. 2. The BB line notch end view of FIG. Sectional drawing of the fuel delivery pipe for engine starting which shows Example 2 of this invention. Sectional drawing of the fuel delivery pipe for engine starting which shows Example 3 of this invention. Sectional drawing of the fuel delivery pipe for engine starting which shows Example 4 of this invention. Sectional drawing of the fuel delivery pipe for engine starting which shows Example 5 of this invention. Sectional drawing of the fuel delivery pipe for engine starting which shows Example 6 of this invention. Sectional drawing of the fuel delivery pipe for engine starting which shows Example 7 of this invention. Sectional drawing of the fuel delivery pipe for engine starting which shows Example 8 of this invention. The front view of the fuel delivery pipe for engine starting which shows Example 9 of this invention. The side view of the fuel delivery pipe for engine starting of Example 9. FIG. The front view of the fuel delivery pipe for engine starting which shows Example 10 of this invention. The side view of the fuel delivery pipe for engine starting of Example 10. FIG. FIG. 12 is a perspective view of a fuel delivery pipe for engine start showing an eleventh embodiment. The CC sectional view taken on the line of FIG. FIG. 18 is a perspective view of a fuel delivery pipe for engine start showing a twelfth embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Communication pipe 2 Connection part 3 Liquid fuel passage 4 Side flat part 5 Sealing flat part 6 Wall surface 7 Socket 10 Communication port 15 Bending piece 16 Connection pipe

Claims (6)

  One end of the pipe member is used as a connection part of the liquid fuel introduction pipe, and one side and / or the other side of the pipe member are crushed in the axial direction while leaving the liquid fuel passage from the connection part to the other end to form a side flat part. As a result, a liquid fuel passage having an inner diameter smaller than the inner diameter of the connection portion is formed, and the other end of the pipe member is crushed to form a sealed portion, and a plurality of walls are formed on the wall surface forming the liquid fuel passage. A fuel delivery pipe for starting an engine, comprising: a communication pipe having an open communication port; and a plurality of sockets for connecting one end to the communication port of the communication pipe and mounting an injection nozzle.   The fuel delivery pipe for starting an engine according to claim 1, wherein the communication pipe is provided with a bent piece obtained by bending a side flat portion in the axial direction.   The fuel delivery pipe for starting an engine according to claim 1, wherein one end of the socket is directly connected to a communication port of the communication pipe.   2. The fuel delivery pipe for starting an engine according to claim 1, wherein the socket is connected to a communication port of the communication pipe through a connection pipe.   2. The fuel delivery pipe for starting an engine according to claim 1, wherein the liquid fuel passage has the same inner diameter from one end to the other end. 2. The fuel delivery pipe for starting an engine according to claim 1, wherein the liquid fuel passage has a large inner diameter on one end side which is a connecting portion side of the communication pipe and a smaller inner diameter on the other end side.

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