JPH09317600A - Installing structure of fuel feed pipe in engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a manufacturing cost, and lighten weight. SOLUTION: In a fuel feed pipe 3, branch pipes 3b, 3b, 3b for installing fuel injectors are formed integrally. In a bracket 4, the positioning plates 4b, 4b, 4b for the fuel injector, a flange 4d for connecting the fuel feed pipe 3, and installing brackets 4a, 4g are formed integrally. The bracket 4 is inserted into the opening parts of the branch pipes 3b, 3b, 3b and a base pipe opening part, those openings are enlarged, and they are caulked.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel injection system for an automobile engine, and more particularly to a fuel supply pipe mounting structure.

[0002]

2. Description of the Related Art FIG. 4 shows an example of a fuel supply pipe mounting structure in a conventional automobile engine fuel injection system. Fuel injector mounting branch pipes 3b, 3b, 3b are provided on the base pipe 3a of the fuel supply pipe 3 shown in the drawing, and the fuel injector positioning plates 6, 6, are provided on the respective branch pipes 3b, 3b, 3b. 6 is attached. Further, a flange 7 for connecting the fuel supply pipe is attached to the opening of the base pipe 3a.

Mounting brackets 8 and 8 are fixed to the fuel supply pipe 3 by brazing or welding, and the fuel supply pipe 3 is fastened to the intake manifold of the engine through the mounting brackets 8 and 8. An iron pipe or an aluminum pipe is used as a material for the fuel supply pipe.

As described above, the method of fixing the mounting bracket by brazing or welding has a problem of heat distortion and a problem of high manufacturing cost.
If an iron pipe is used as the material of the fuel supply pipe, the weight becomes heavy, and if an aluminum pipe is used, the brazing or welding cost becomes extremely high.

There is a method of forming the mounting bracket integrally with the fuel supply pipe by die casting in order to save the labor of brazing or welding, but in that case, there is a problem that the weight of the fuel supply pipe becomes large.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a structure for mounting a fuel supply pipe of an engine which can reduce the manufacturing cost and reduce the weight. Is to provide.

[0007]

According to the present invention, there is provided a structure for mounting a fuel supply pipe of an engine, wherein a plurality of fuel injector mounting branch pipes are integrally formed on a linear base pipe to mount the fuel injector. A bracket in which a positioning plate of a fuel injector and a mounting bracket are integrally formed is inserted into the branch pipe for use, and the opening portion of the branch pipe is expanded and caulked.

Further, the fuel supply pipe mounting structure for an engine according to the present invention is a fuel supply pipe in which a plurality of fuel injector mounting branch pipes are integrally formed on a linear base pipe, A bracket in which the positioning plate of the fuel injector, the flange for connecting the fuel supply pipe and the mounting bracket are integrally formed is inserted into the opening of the base pipe, and the opening of the branch pipe and the opening of the base pipe are caulked. It is a thing.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A fuel supply pipe mounting structure according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a mounting structure of a fuel supply pipe according to an embodiment of the present invention, and FIG. 2 is a partial sectional view showing the mounting structure.

In the fuel supply pipe 3 shown in the drawing, a branch pipe 3b, 3b, 3b for mounting a fuel injector is integrally formed on a linear base pipe 3a whose one end is closed. In addition,
The fuel supply pipe 3 is formed by a hydroforming method using an aluminum pipe. The bracket 4 is made by pressing an aluminum plate material, and the mounting brackets 4a, 4a, the positioning plates 4b, 4b, 4b and the fuel supply pipe connecting flange 4d are integrally formed.

The positioning plate 4b is for positioning the fuel injector attached to the branch pipe 3b, and is provided with a positioning recess 4c. The fuel supply pipe 3 and the bracket 4 are integrally fixed by caulking. FIG. 2 shows a state in which the bracket 4 is crimped to the fuel supply pipe 3. Although the branch pipe 3b and the base pipe opening 3c are not expanded in the state where the fuel supply pipe 3 is manufactured as a single body, the holes formed in the bracket 4 in that state are the base pipe opening 3c and the three branch pipes. By being inserted into the pipe 3b and expanding the base pipe opening 3c and the three branch pipes 3b, they are caulked as shown in FIG. Note that only one branch pipe 3b is shown in FIG.

FIG. 3 shows a state in which the integrated fuel supply pipe 3 and bracket 4 are attached to the engine. In the figure, 1 is an intake manifold, which is fastened to a cylinder head 2. The fuel injector 5 is composed of a solenoid valve and injects fuel from a plurality of injection holes in a plurality of directions. The bracket 4 is fastened to the intake manifold 1 through the holes of each mounting bracket 4a, and at that time, the fuel injector 4 is fitted between the branch pipe 3b and the intake manifold 1. Each cylinder is provided with a plurality of intake valves so that the fuel in each injection direction injected from the fuel injector 4 can be smoothly taken in from each intake valve.

Since such a fuel injector 4 is rotated around the branch pipe 3b, the rotational position of the fuel injector 4 must be positioned so that the fuel injection direction is aligned with the intake valve direction. Therefore, the connector mounting resin member 5a of the fuel injector 5 is sandwiched by the positioning recess 4c of the positioning plate 4b to determine the rotational position of the fuel injector 4. The fuel supply pipe 3 is connected to the fuel pump by the fuel supply pipe connecting flange 4d shown in FIGS.

When the fuel supply pipe 3 and the bracket 4 are swaged by the base pipe opening 3c and the branch pipe 3b as in this embodiment, the faces formed by the swaged portions are two orthogonal faces, so that the fuel is supplied. The pipe 3 and the bracket 4 have a strong integrated structure, and the wall thickness of the member can be reduced. However, when crimping a plurality of branch pipes and brackets, the number of caulking points is large, so that the caulking strength increases and Has the effect of the invention.

Further, when the present invention is applied to a V-type 6-cylinder engine, a fuel supply pipe in which two linear base pipes are connected in a U-shape can be used.

[0016]

According to the fuel supply pipe mounting structure for an engine of the present invention, since there are no brazing or welding processes, the manufacturing cost is low, and the degree of freedom in selecting the material for the fuel supply pipe and the bracket is increased. . For example, when aluminum is used, the weight is reduced.

Further, conventionally, the parts such as the positioning plate, the fuel supply pipe connecting flange, and the mounting bracket, which have been supplied as separate parts, become one part, and the number of parts becomes small, so that the manufacturing cost becomes low.

Further, since the two parts are caulked at a plurality of locations, the caulking strength is increased and the positioning accuracy of the positioning plate and the mounting bracket can be easily increased.

[Brief description of drawings]

FIG. 1 is a perspective view showing a mounting structure of a fuel supply pipe of an engine which is an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view showing the same mounting structure.

FIG. 3 is a cross-sectional view showing the same mounting structure.

FIG. 4 is a perspective view showing an example of a conventional fuel supply pipe mounting structure for an engine.

[Explanation of symbols]

1 intake manifold 2 cylinder head 3 fuel supply pipe, 3a base pipe, 3b branch pipe, 3c base pipe opening 4 bracket, 4a mounting bracket, 4b positioning plate, 4c positioning recess, 4d fuel supply pipe connecting flange 5 fuel injector 5a Connector mounting resin member 6 Positioning plate 7 Fuel supply pipe connecting flange 8 Mounting bracket

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tsutomu Taguchi 2480 Kuno, Odawara-shi, Kanagawa Mikuni Odawara Plant

Claims (2)

[Claims] 1. A positioning plate and a mounting bracket for a fuel injector are integrally formed on the fuel injector mounting branch pipe of a fuel supply pipe in which a plurality of fuel injector mounting branch pipes are integrally formed on a linear base pipe. A mounting structure for a fuel supply pipe of an engine, wherein the bracket is inserted and the opening portion of the branch pipe is widened and caulked. 2. A positioning plate for a fuel injector, a fuel injector positioning plate, and a fuel are provided in the fuel injector mounting branch pipe and the base pipe opening of a fuel supply pipe in which a plurality of fuel injector mounting branch pipes are integrally molded in a linear base pipe. Mounting of a fuel supply pipe of an engine, characterized in that a bracket for which a supply pipe connecting flange and a mounting bracket are integrally formed is inserted and the opening and the base pipe opening of the branch pipe are expanded and caulked. Construction.