JP4574446B2 - Fuel delivery pipe - Google Patents

Description

  The present invention relates to a fuel delivery system for supplying fuel fed from a fuel pressurization pump in a fuel tank of an electronic fuel injection type automobile engine or the like directly into each intake passage or each cylinder of the engine via an injector. This is related to the pipe and avoids interference with other parts such as engine parts when attached to the engine, and also makes it possible to secure a tool handling space when attaching the fuel delivery pipe.

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

  And this fuel delivery pipe is directly attached and fixed to the engine body, intake manifold, etc., so when it is a straight tube without any processing (especially it has an absorber surface and the cross-sectional shape is flat) In the case of a pipe), there are many cases where interference occurs during installation between the engine body and other engine parts. In addition, there may be a case where the space for handling the tool during installation cannot be secured due to interference with the pipe itself. Therefore, in the past, in order to secure such a tool handling space and avoid interference with other members, in a pipe type fuel delivery pipe having a straight tubular cross-sectional shape with respect to the longitudinal direction of the fuel delivery pipe, However, as shown in Patent Document 1 or FIGS. 11 and 12, a molding concave portion (23) for avoiding interference with a tool handling space and other members is known by a sheet metal press mating box format. ing.

In this sheet metal press-made laminated box format, an inner frame (21) having a U-shaped cross section and a smaller size than the outer frame (20) is inserted and fitted into an outer frame (20) having a U-shaped cross section. Thus, the rail body (22) is formed, and the entire contact portion between the outer frame body (20) and the inner frame body (21) is fixed by brazing. In this method, a molding concave portion (23) is formed at the time of molding each of two parts of a matching box shape of the outer frame body (20) and the inner frame body (21) at the time of sheet metal press molding. Is. 11 and 12, the socket (25) for installing the bracket (24) and the injector is disposed on the outer surface of the outer frame (20).
JP-A-9-170516

  However, in the above conventional method, two sets of mold groups in which many molds are combined for a large number of pressing processes corresponding to the two parts of the mating box are required, and the entire area of the joining part of the two parts is large. Brazing is required, a large amount of expensive and heavy brazing material is required, and the product unit price is high, and the weight of the product is increased. In addition, there is a risk of leakage occurring in this long brazed part over the entire length, and in order to prevent fuel leakage reliably, a leak test is required over the entire length of the brazed part. In addition, it has the disadvantage of making the unit price of the product more expensive because of the expense required.

  Therefore, the present invention is to press the pipe-type communication pipe having an integral structure by pressing to form a molding recess, so that when the communication pipe is attached to the engine, it is different from other parts such as engine components. It avoids interference and prevents interference with the fuel delivery pipe itself, and makes it possible to secure a tool handling space when attaching to an engine or the like. Further, it is intended to obtain a fuel delivery pipe that is inexpensive and highly reliable by eliminating the need for brazing with a large area and a long circumference in forming the communication pipe, reducing the number of leak test processes.

In order to solve the above-mentioned problems, the present invention has a connecting pipe having a flexible absorber surface with a flat outer wall surface and a one end connected to the connecting pipe. with Te in fuel delivery Lee pipe with a socket for connecting the jet nozzle communicates with the fuel passage, to form formed a molding recess is pressed by pressing the communicating pipe in the width direction or thickness direction The molding convex part is formed at a position corresponding to the molding concave part .

  In addition, the molding recess formed by pressing the communication pipe by press working enables the operation of the tool at the time of fastening the screw part to the bracket installed in the communication pipe when the communication pipe is attached to the engine. Also good.

  Moreover, the molding recessed part formed by the press by press work to a communicating pipe | tube may make it possible to avoid interference with an engine component at the time of attachment to an engine of a communicating pipe | tube.

  The present invention is configured as described above, and is formed by a single component by pressing the absorber surface of a pipe-type communicating pipe having an integral structure by pressing from the width direction or the thickness direction to form a molding recess. It is possible to form a communication pipe with a structure, and there is no need for a mold group in which many dies are combined for a number of pressing processes, and it is not necessary to braze a large area using expensive and heavy brazing material Therefore, it is possible to obtain a cheaper and lighter product as compared with the formation of a communicating tube with a laminated box shape. In addition, since a long distance brazing operation is not required, a process such as a leak test of a brazed portion is unnecessary or extremely few, so that the product is inexpensive and the product is reliable for fuel leakage. It becomes possible to improve the property.

  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 of a fuel delivery pipe according to the present invention will be described in detail with reference to FIG. 1. (1) is a communication pipe and is an integral structure pipe-type element provided with a fuel passage (9) inside. The tube is pressed from the outer surface to form a flat flexible absorber surface (2). Moreover, this absorber surface (2) may employ | adopt as a communicating pipe (1) what was formed previously at the time of manufacture of the pipe-type elementary pipe of an integral structure. This absorber surface (2) is pressed by pressing from the width direction to form a forming recess (3) in the width direction. A bracket provided with a bolt hole (4) for inserting a bolt on the side surface of the communication pipe (1) perpendicularly intersecting the molding recess (3) formed by pressing the absorber surface (2) from the width direction by pressing. (5) is installed by brazing. When attaching the communication pipe (1) to the engine by fastening bolts, nuts, etc. via the bracket (5), a communication pipe is provided so that a tool (not shown) can be inserted into the molding recess (3). The tool handling space is secured by preventing the tool from interfering with the tool. A plurality of sockets (6) for attaching injectors (not shown) are provided on the surface of the communication pipe (1) on the bracket (5) attachment side.

  The molding recess (3) formed in the communication pipe (1) is not only for securing a tool handling space for attaching the communication pipe (1) to the engine via the bracket (5), but also for engine parts and the like. It can also be used to avoid interference with the member. In the first embodiment, as shown in FIG. 1, two molding recesses (3) for securing a tool handling space are formed, and the side surface in the width direction of the communication pipe (1) is approximately in the middle of the two molding recesses (3). In addition, a molding recess (3) is formed for avoiding interference of members such as engine parts.

  Also, (7) in the figure is a molding convex part, which is formed at a corresponding position of the communication pipe (1) corresponding to the formation of the molding concave part (3). Since these molding convex part (7) and molding concave part (3) are formed in the absorber surface (2) as an absorption part of the pressure pulsation which generate | occur | produces with fuel injection, the absorber surface (2) is formed. Although it is not a uniform plane, it is possible to suppress the transmission and propagation of the seating sound (shock wave) of the spool that reciprocates when the fuel injector is opened and closed. Further, the noise can be reduced by dispersing the radial direction of the seating sound (shock wave) of the spool by the molding convex part (7) and the molding concave part (3).

  In the first embodiment, the communication recess (1) is formed with a molding recess (3) for securing a tool handling space and a molding recess (3) for avoiding interference between members such as engine parts. When there is no interference with engine parts in the attached state of the communication pipe (1), as shown in FIG. 2, a molding recess (for securing a tool handling space in the width direction of the communication pipe (1) ( Only 3) may be formed. In this case, the formation of the molding concave portion (3) is mainly aimed at securing a tool handling space for attachment to the engine. By securing a large area of the absorber surface (2), it is accompanied by fuel injection. Therefore, it is possible to increase the ability to absorb pressure pulsations that occur.

  Further, in each of the above-described embodiments, the forming recess (3) is formed in the width direction of the communication pipe (1) by applying a pressing force from the width direction of the communication pipe (1). 3 and 4, as shown in FIGS. 3 and 4, a pressing concave portion is applied in the thickness direction of the flat communication pipe (1) to form a molding concave portion (3), which intersects the molding concave portion (3) perpendicularly. A bracket (5) is mounted on the surface in the width direction to be mounted. In this case as well, the main purpose is to secure a tool handling space for installation in the engine. By securing a large area of the absorber surface (2), the ability to absorb pressure pulsation generated by fuel injection is also provided. Can be increased. Further, a molding convex portion (7) corresponding to the formation of the molding concave portion (3) is formed on the width direction surface of the communication pipe (1) at a position corresponding to the molding concave portion (3).

  In each of the above embodiments, since the material having the flat absorber surface (2) formed in advance is used as the material of the communication pipe (1), the absorber surface (2) in the width direction is made flat. In Example 4, a circular pipe is used for the communication pipe (1). Then, as shown in FIG. 5, the communication pipe (1) formed by the circular pipe is pressed from the side surface to form an absorber surface (2) and a molding concave portion (3 for preventing interference with members such as engine parts. ). The forming concave portion (3) as the absorber surface (2) is of a dog bone type that curves in an inner arc shape. Further, a molding convex portion (7) is formed at a corresponding position of the communication pipe (1) corresponding to the formation of the molding concave portion (3) as the dog bone type absorber surface (2). In addition, only the connecting portion (8) of the bracket (5) is left without being pressed without being pressed by the press. Then, one end of the bracket (5) is wound around the connection portion (8) in a U-shape and protrudes perpendicularly to the absorber surface (2), thereby increasing the mounting strength of the bracket (5) to the communication pipe (1). It is strengthening. The main purpose of this embodiment is to absorb pressure pulsation generated by fuel injection and to prevent interference with members such as engine parts by the action of the absorber surface (2) formed by molding the molding recess (3). It is a thing.

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 perspective view of the fuel delivery pipe of Example 3 of this invention. The AA line expanded sectional view of the communicating pipe part which abbreviate | omitted the bracket and socket of FIG. The perspective view of the fuel delivery pipe of Example 4 of this invention. The perspective view of the fuel delivery pipe of a conventionally well-known example. The expanded sectional view of the bracket part of FIG.

DESCRIPTION OF SYMBOLS 1 Communication pipe 2 Absorbing surface 3 Molding recessed part 4 Bolt hole 5 Bracket 6 Socket 7 Molding convex part 9 Fuel passage

Claims (3)

An integral pipe type with a fuel passage inside, a communication pipe with a flexible outer surface having a flat outer wall surface, and one end connected to the communication pipe to communicate with the fuel passage and an injection nozzle in fuel delivery Lee pipe with a socket for, as well as the shape formed the molding recess is pressed by pressing the communicating pipe in the width direction or thickness direction, forming convex portions at a position corresponding to the molding recess A fuel delivery pipe characterized by the formation of The molding recess formed by pressing the communicating pipe by press working enables the tool to be operated when the threaded part is fastened to the bracket installed in the communicating pipe when the communicating pipe is attached to the engine. The fuel delivery pipe according to claim 1 . 2. The fuel delivery according to claim 1, wherein the molding recess formed by pressing the communication pipe by press working makes it possible to avoid interference with engine parts when the communication pipe is attached to the engine. Ipipe.

Images