JPH0331576A - Injector housing for fuel distribution - Google Patents

Abstract

PURPOSE:To simplify the structure and to reduce the weight and cost of injector housings by forming pipe joints having a pipe connecting hole on the side walls of injector housing main bodies, and joining a fuel distribution pipe at a right angle to the pipe connecting hole. CONSTITUTION:Plural injector housings 1 are connected together in series by a fuel distribution pipe 2 to communicate with each other. In this case, a pipe material is subjected to hydraulic bulging to form an injector housing main body 5 having a pipe joint 6. Both mutually facing side surfaces of the pipe joint 6 are respectively formed in a flat surface 7, and the pipe connecting holes 8 of the joints are bored in the flat surfaces 7 coaxially. On the other hand, the end portion of the fuel distribution pipe 2 is cut to be right-angled to the shaft center of the pipe. The end portion of the fuel distribution pipe 2 is inserted in the respective pipe connecting holes 8 of the pipe joints 6 and joined thereto to be right-angled to the respective flat surfaces 7.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to injector housings for dispensing fuel into cylinders in vehicles.

Most of the injector housings for fuel distribution in prior art vehicles connect a plurality of injector housings so as to communicate with each other via fuel distribution pipes, and the injectors fitted in the housings are filled with fuel. While cooling, fuel is passed through the injector, and the fuel is ejected into the cylinder from an injector nozzle that protrudes from the end of the housing.

The injector housing has an approximately two-stage cylindrical shape having a large-diameter cylindrical portion into which the injector body is fitted, and a small-diameter cylindrical portion from which the injector nozzle protrudes from the tip of the cylindrical portion. is produced by subjecting small metal ingots to several stages of cold forging and further drawing. On the other hand, the end of the fuel distribution pipe is cut to have a curved surface that matches the curvature of the injector housing, and is joined to the side wall of the injector housing.

Problems to be Solved by the Invention As mentioned above, conventional injector housings have the drawbacks of being heavy due to being a forged product, requiring several stages of forging and drawing, and being expensive. Furthermore, as mentioned above, the end of the fuel distribution pipe requires highly accurate curved cutting, which is a factor in increasing labor costs.

The present invention solves the above-mentioned problems, and achieves simplification of the structure, weight reduction, and cost reduction of the above-mentioned injector housing assembly.

As a means for solving the problems, the present invention is to form an injector housing main body using a pipe material, and to perform a hydraulic bulging process on the pipe material to form a pipe joint. A pipe connection hole that opens in each of a pair of parallel opposing planes is bored in the pipe joint, and a fuel distribution pipe whose pipe end is cut at right angles is joined to the connection hole so as to be perpendicular to each of the planes. It is composed of

Further, in the present invention, a fuel distribution pipe is inserted through the connection hole of the pipe joint, and an oil passage hole is provided in a portion of the fuel distribution pipe that extends into the pipe joint.

According to the present invention, by applying hydraulic bulge machining or the like, a tube material obtained by cutting a long pipe into short lengths is placed in an outer mold, and by applying internal pressure from inside the tube material, the diameter of the tube is expanded and the polarity of the tube wall is expanded. The pipe joint can be formed with the injector housing body by bulging the tube wall or by bulging only the extreme portion of the tube wall without expanding the tube diameter.

Therefore, the injector housing can be easily manufactured from commercially available pipe materials, and the weight can be easily reduced.

In addition, as described above, by forming a pipe joint into the injector housing body and drilling a connection hole that opens in a pair of parallel opposing planes, the fuel distribution pipe can be formed by simply turning the end of the pipe at right angles. It can be cut and connected to the above connection hole by brazing, etc.

EXAMPLES Hereinafter, examples of the present invention will be explained based on FIGS. 1 to 11.

Reference numeral 1 indicates an injector housing, and 2 indicates a fuel distribution pipe. As shown in FIG. As shown by the arrow in FIG. 3, the fuel supplied from one end of the assembly is sequentially passed through the fuel distribution pipe 2 into the injector housing 1 and recovered from the other end. A configuration in which the fuel filling the housing 1 is used to cool the injector 3 fitted in the housing, the fuel is passed through the injector 3, and the fuel is jetted into the cylinder from an injector nozzle 4 protruding from one end of the housing. It is becoming.

The injector housing body 5 is made of a tube material obtained by cutting a long pipe to a fixed size, and the injector housing body 5 having a pipe joint 6 is formed by applying a hydraulic bulging process to the tube material.

For example, as shown in FIGS. 1 to 8, one side wall of the injector housing body 5 is bulged out by the bulging process to form a single pipe joint 6, and the opposite side of the pipe joint 6 is A pair of parallel opposing planes 7, 7 are formed on each side surface. Reference numeral 10 denotes a small diameter cylindrical portion connected to the end of the injector housing main body 5.

Alternatively, as shown in FIG. 9, opposing side walls of the injector housing main body 5 are bulged to form a pair of pipe joints 6.6, and each opposing side wall of the pipe joint 6. A pair of parallel opposing planes 7.7 are formed.

Furthermore, pipe connection holes 8 are provided on each plane surface of the pipe joint intro.
The fuel distribution pipe 2 is formed by cutting the pipes so that both pipe connection holes 8 are arranged on the same axis, and the pipe end 9 is cut perpendicularly to the pipe axis. As shown in the figure, the pipe end 9 of the fuel distribution pipe 2 is inserted into the connection hole 8, and is joined to the inner wall of the connection hole 8 by brazing or the like so as to be perpendicular to each of the planes 7.

On the other side, as shown in FIG. 8, an injector housing main body 5 is formed by hydraulic bulge processing using a pipe material, and at the same time, one side wall of the injector housing main body 5 is bulged by the same bulge processing to form the above-mentioned injector housing main body 5. A pipe joint intro having a plane 7.7 is formed, and a pipe connection hole 8 is cut in each plane of the pipe joint 6 so as to be coaxial with each other, and both pipe connection holes are formed. 8, a fuel distribution pipe 2 is inserted therethrough, and an oil passage hole 12 is provided in a portion of the fuel distribution pipe 2 extending into the pipe joint.

The above-mentioned connection hole 8 may be opened in virtual planes facing in parallel, and the planes F and F may not remain.

The injector 3 is installed inside the injector housing main body 5.
The nozzle 4 of the injector 3 is made to protrude from the small diameter cylindrical portion 10, and the other end opening of the injector housing body 5 is sealed with a cover 11. Reference numeral 13 denotes a flange for attaching the cover 11, which is press-fitted into the opening edge of the injector housing body 5 and brazed.

The above-mentioned hydraulic bulging process is a cold-open molding method in which ultra-high pressure hydraulic pressure is applied from the inside of the pipe material placed in an outer mold to inflate the peripheral wall of the pipe material to fit the outer mold. As a method of forming the injector housing 1, Fig. 10A
, a small-diameter pipe 1° is prepared as shown in B, and the central part of the small-diameter pipe 1°, excluding both pipe ends, is subjected to the above hydraulic bulging process as shown by the imaginary line in Fig. 10A. The injector housing is formed by expanding the pipe to a diameter, and forming a pair of pipe shim intros by bulging the extreme parts of the expanded pipe wall, and then cutting the expanded pipe part at the middle part of both pipe joints 6. You can take two pieces of 1. The two-hand diameter tube end portion is the nozzle 4 of the injector 3.
becomes the small-diameter cylindrical portion 10 that protrudes, and the large-diameter expanded tube portion becomes the injector housing main body 5.

As another hydraulic bulge processing method, as shown in FIG. 11A, a large-diameter pipe material of 1° is prepared, and as shown in FIG. Alternatively, the pipe joint 6 is bulged by applying internal pressure to the poles of the two opposing side walls, and then the pipe end is swaged as shown in FIG. narrowing down to form the small span part 10, and the small diameter cylindrical part 10
The 1° portion of the large-diameter pipe material excluding the above is referred to as the injector housing body 5.

DETAILED DESCRIPTION OF THE INVENTION As described above, the present invention involves applying hydraulic bulge processing to a pipe material to bulge a pipe joint to form an injector housing, which is then used to fit an injector and a fuel distribution pipe. Used for joining.

According to the present invention, the injector housing having the pipe joint can be easily formed by cutting a long pipe into short lengths by applying hydraulic bulge processing, etc., and the injector housing can be mass-produced using commercially available pipe materials. It is possible to effectively achieve simplification of the trunk, structure, weight reduction, and cost reduction.

In addition, as described above, by molding a pipe joint into the injector housing body and providing connection holes that open in a pair of parallel opposing planes, the fuel distribution pipe can be created by simply cutting the end of the pipe at a right angle. However, it can be easily joined by brazing, etc. to the connection holes drilled in each of the above planes, and in the assembly of a fuel distribution connector housing that requires a multi-point joint,
This greatly simplifies the end face processing of each fuel distribution pipe and its joining work, helping to reduce the costs mentioned above.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which FIG. 1 is a perspective view of a unit injector housing, FIG. 2 is a plan view of the assembly of the injector housing, FIG. 3 is a side view of the same, and FIG. 4 is a front view of the same. Fig. 5 is a vertical sectional view of the injector housing as seen from the side into which the injector is fitted, Fig. 6 is a vertical sectional view of the injector housing as viewed from the front, Fig. 7 is a cross-sectional view of the injector housing, and Fig. 8 is another example. FIG. 9 is a plan view of an injector housing showing another example. FIGS. 10A and 10B show an example of hydraulic bulge processing of the injector housing, and FIG. 9A shows a preliminary injector housing. Cross-sectional view of the processed product,
11B is a side view of the same, FIGS. 11A, B, and C show other examples of the same hydraulic bulge processing, FIG. 11A is a sectional view of the material, and FIG. Figure C is a sectional view of the secondary processed product. 1... Injector housing, 1"... Piping material, 2
...Fuel distribution pipe, 3...Injector, 4...
・Nozzle, 5... Injector housing body, 6.
...Pipe joint, 7...Flat surface, 8...Pipe connection hole, 9...Pipe end, lO...Small diameter cylindrical part, 12...
・Oil hole.

Claims (2)

[Claims] (1) In a fuel distribution injector housing in which a plurality of injector housings are connected in series so as to communicate with each other via a fuel distribution pipe, a pipe joint is formed by bulging the side wall of the injector housing main body formed from a pipe material. A fuel distribution pipe is formed by forming pipe connection holes opening in each of a pair of parallel opposing planes in the pipe joint, and cutting the other pipe end perpendicular to the pipe axis, and forming a fuel distribution pipe. An injector housing for fuel distribution, characterized in that a tube end of the tube is joined to each of the connection holes so as to be perpendicular to each of the planes. (2) The fuel according to claim 1, wherein a fuel distribution pipe is inserted through the fuel distribution pipe in communication with both the pipe connection holes, and an oil passage hole is provided in a portion of the fuel distribution pipe that extends into the pipe joint. Distribution injector housing.