JP3119449B2 - Leakage pipe and method of forming the same - Google Patents

Description

The present invention relates generally to a diesel internal combustion engine, which is arranged over individual fuel injection nozzles and has a pipe diameter of 6 mm for returning excess fuel. The present invention relates to a leakage pipe made of a small-diameter pipe having a diameter of less than about one degree and a molding method thereof.

(Prior Art) Conventionally, as this type of leakage pipe and its forming method, as shown in FIG. 9, individual eye joints (11, 11 ', 11 ") formed by cutting using a bar or a forged material are exemplified. ......) The member is formed by brazing (13) a short curved pipe material (12), which is a separate body, into a mounting hole provided on the peripheral side wall surface.

(Problems to be Solved by the Invention) However, in such a conventional technique, a mounting hole formed by the cutting, a concave groove flow path communicating with the mounting hole, an assembling hole in a peripheral wall surface, and a seat surface are provided. The productivity is severely impaired in connection with the processing of the like, and the eye joints (11, 11 ′, 11 ″...) Are not thickened due to the soldering structure by inserting the end of the tube into the mounting hole. To increase the product weight, and furthermore, the eye joints (11, 11 ',
It is necessary to assemble a pipe (12) that has been bent to 11 "...), temporarily fix it by plasma arc welding, etc., temporarily assemble the entire body, and then solder it (13). In addition, the pipe material (12) bent after the soldering (13) is attached to the individual injection nozzles at the mounting pitch position, and the eye joints (11, 11 ', 11 "...)
In this case, it is necessary to correct the parallelism of the sheet surface while adjusting the jig, thereby causing a problem that the operation is significantly stagnated.

The present invention has been made in view of the above-mentioned problems of the related art, and significantly improves productivity by eliminating the need for any cutting work. In order to reduce the inconvenience in these operations by reducing the number of work pieces, and to obtain the exact mounting pitch position between the eye joint parts by the integrated structure by pressing, the pitch after the finished product and the parallelism of the seat surface of the eye joint etc. It is an object of the present invention to propose a leakage pipe and a method of forming the leakage pipe, which can eliminate the need for the fixing jig alignment work.

(Means for Solving the Problems) In order to achieve the above object, according to a first aspect of the present invention, a mounting hole is provided through a shaft core, and a peripheral edge of the mounting hole is bent inward. A pair of semi-truncated shapes in which a plurality of cap-shaped eye joints having an annular groove flow path communicating with the mounting hole therein are connected by a connecting wall having a groove communicating with the groove flow path. The leakage pipe is characterized in that opposite free ends of the members are fitted to each other, and the fitted portion is fixed, and a second aspect of the present invention is a fitting pipe for fitting a seal member to a seat surface of the eye joint. Wherein an annular groove is provided.
Is characterized in that a reinforcing annular rib is interposed between the pair of members.

According to a fourth aspect of the present invention, a mounting hole is previously formed in a shaft core portion by press working with a steel plate material, and a peripheral edge of the mounting hole is bent inward to communicate with the mounting hole inside. A plurality of cap-shaped eye joints provided with annular concave groove flow paths are connected to each other by a connecting wall having a concave groove communicating with the concave groove flow path, and are formed into a half cut shape. The free ends of the pair of members are opposed to each other and fitted together,
A method of forming a leakage pipe fixedly formed along the mutual fitting portion is characterized in that a reinforcing annular rib is provided between the pair of half-cut members. After the interposition, the free ends of the members are opposed to each other and fitted to each other, and are fixed along the mutual fitted portion and the contact portion between the member and the annular rib. .

(Operation) Since the present invention is based on such a configuration and a forming method thereof, the cutting work is not required at all by the integrated structure of the cap-shaped eye joint and the connecting wall by the press working with the steel plate material, and the productivity is remarkably enhanced. In addition to reducing the weight of the entire product, and reducing the work required for soldering during subsequent soldering, the complexity of these operations is reduced, and at the same time, the mounting pitch position between the eye joints and the parallelism of the sheet surface, etc., are accurately determined. Therefore, the work of adjusting the jig for correcting these pitches after the finished product is not required.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.
FIG. 1 is a plan view showing a leakage pipe formed by the molding method of the present invention, FIG. 2 is a side view of FIG.
FIG. 1 is an enlarged sectional view taken along line AA of FIG. 1, and FIG.
FIG. 5 is an enlarged sectional view taken along line CC of FIG. 1, FIG. 6 is a sectional view showing another embodiment of the connecting wall, and FIG. 7 is another embodiment of the present invention. FIG. 8 is a partially enlarged sectional view showing still another embodiment of the present invention, and FIG.
FIGS. 8A to 8C are partially cutaway perspective views showing another embodiment of the rib used in FIG.

In FIG. 1 to FIG. 5, (1, 1 ', 1 "...) Are hat-shaped eye joints. An annular groove flow path (2) is formed by bending a peripheral edge of the mounting hole inward and communicating with the mounting hole (3) inside. ) Are formed in a semi-cut shape by connecting with a connecting wall (4) having a concave groove communicating therewith, and the free ends of a pair of members (5, 5 ') made of these half-cut shapes are opposed to each other. The free ends are fitted together, and fitted along the fitted portions (third and fourth).
In the state shown in the figure, the joint is soldered (6), seam welded,
Alternatively, it is formed by being fixed by beam welding or the like.

Incidentally, the shape of the connecting wall (4) can be made as shown in FIG. 6 in relation to the shape of the hat-shaped eye joint.

Further, in order to enhance the sealing performance between the seat surface of the eye joint (1, 1 ', 1 "...) And the mating member or the seat surface of the tightening bolt head, an annular groove (FIG. 7) for fitting a seal member is used. 8, 8 ') It is preferable to provide communication between the mounting hole (3) and the groove channel (2) when the inner peripheral wall of the mounting hole (3) is closed as shown in FIG. Hole (7) can be provided to secure the pressure.

When the seat surface of the eye joint (1, 1 ', 1 "...) Is large, a communication hole (7') as shown in FIG. Annular rib for reinforcement having a U-shaped cross section (9)
Preferably, the annular rib is provided in FIG.
, A substantially Z-shaped cross section as shown in FIG. 8B, or a corrugated shape as shown in FIG. 8C.

Note that the annular ribs (9) shown in FIGS. 8A to 8C are simultaneously attached to the pair of members (5, 5 ') when the free ends of the pair of members (5, 5') are fixed along the mating portions. It goes without saying that they are fixed to each other even at the contact surface with the member.

(Effects of the Invention) As described above, the leakage pipe according to the present invention and the method for forming the same are formed by pressing a plurality of cap-shaped eye joints (1, 1 ', 1 "...) by pressing a steel plate.
Is made up of a pair of semi-truncated members connected by a connecting wall (4) instead of a tube material, so that productivity can be significantly increased without any cutting work, and the entire product is made lightweight. At the same time, the work required for tacking at the time of the subsequent soldering (6) is reduced to reduce the troublesome work, and at the same time, the eye joint (1, 1 ′, 1 ″...) Since the position of the mounting pitch between the parts, the parallelism of the sheet surface, and the like can be accurately obtained, there is an excellent effect such that the work of adjusting the jig for correcting the pitch after completion can be omitted.

[Brief description of the drawings]

FIG. 1 is a plan view showing a leakage pipe formed by a molding method according to one embodiment of the present invention, FIG. 2 is a side view of FIG. 1, and FIG. 3 is an enlarged cross section taken along line AA of FIG. Figure, 4th
FIG. 1 is an enlarged sectional view taken along the line BB of FIG. 1, and FIG.
FIG. 6 is a sectional view showing another embodiment of the connecting wall, FIG. 7 is a view corresponding to FIG. 3 showing another embodiment of the present invention, and FIG. 8A to 8C are partially cutaway perspective views showing another embodiment of the rib used in FIG. 8, and FIG. 9 is a leakage constituted by a conventional example. It is a top view showing a pipe. (1, 1 ', 1 "...) Eye joint, (2) ...
Groove channel, (3) mounting hole, (4) connecting wall,
(5, 5 ') ... a pair of members, (6) ... solder welding

Claims (5)

(57) [Claims] An annular groove flow path (3) penetrating a mounting hole (3) in a shaft core portion, and bending a peripheral edge of the mounting hole inward to communicate with the mounting hole therein. A plurality of cap-shaped eye joints (1, 1 ', 1 ",...) Having the shape 2) are connected by a connecting wall (4) having a groove communicating with the groove flow path (2). A leakage pipe characterized in that opposite free ends of a pair of members (5, 5 ') are fitted to each other and the fitted portion is fixed (6). 2. A leakage pipe according to claim 1, wherein annular grooves (8, 8 ') for fitting a seal member are provided on a seat surface of said eye joint. 3. A leakage pipe according to claim 1, wherein an annular rib for reinforcement is interposed between said pair of members. 4. An annular recess through which a mounting hole is previously formed in a shaft core by press working with a steel sheet material, and a peripheral edge of the mounting hole is bent inward to communicate with the mounting hole. A plurality of cap-shaped eye joints provided with the groove flow paths are connected to each other by a connecting wall having a concave groove communicating with the concave groove flow path, and are formed into a semi-cut shape. A method for forming a leakage pipe, wherein free end portions are opposed to each other and fitted to each other, and are fixedly formed along the fitted portions. 5. After interposing a reinforcing annular rib between the pair of members having the half-cut shape, the free ends of the members are opposed to each other and fitted to each other. 5. The method according to claim 4, wherein the leakage pipe is fixed along a contact portion with the annular rib.