JPH09280459A - Fixing structure of branch connecting body connecting branch coupling in common rail and its forming method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate mounting and positioning, by forming to serve as a screw hole, a through-hole formed in the circumferential wall of a main pipe rail in which a shaft core inside is made to serve as a circulating pass, and screwing into a screw hole on a main pipe rail side, a branch connecting body connecting branch coupling having an outwardly opening pressure receiving seat surface and a screw wall at one end. SOLUTION: In a main pipe rail 1 as a common rail, the inside thereof is formed to serve as a circulating pass 1', a plurality of through-holes 1" passed through the circulating pass 1' is arranged in an axial circumferential wall having an interval, and the circumferential surfaces of the through-holes 1" are threadably machined so as to form a screw hole 2'. In a branch connecting body connecting branch coupling 3, a channel 3' is arranged in a shaft core by drilling, and subsequently, the machining of the pressure receiving seat surface 2 outwardly opened at one end and the machining in the screw wall 2" are executed, and also the machining of a screw 4 continued to a stepped part 6 at the other end is executed. After the screw 4 of this branch coupling 3 is screwed and attached to the screw hole 2' on a main pipe rail 1 side, an abutting part in screw and/or the stepped part 6 is fixed by being brazingly welded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention generally relates to fixing a branch joint for connecting a branch connector by a branch branch pipe or a branch fitting and various control parts in a common rail system such as a thick steel pipe or a block rail in a diesel internal combustion engine. The present invention relates to a structure and a forming method thereof.

[0002]

2. Description of the Related Art Conventionally, as a fixing structure of this type, for example, as shown in FIG. 5, an internal flow passage (11 ') provided in a peripheral wall portion of a main rail (11) side made of a thick and thin metal pipe material. )
The through hole (11 ″) communicating with the pressure receiving seat surface (12) opening to the outside, and the main rail (1 near the pressure receiving seat surface.
By using the branch joint (14) surrounding the outer peripheral portion of 1), the pressing seat surface (13 ″) on the side of the branch connector (13) in which the end portion has a tapered conical shape and the enlarged diameter portion (13 ′) is formed. ) Is abutted and engaged with the screw wall (14 ') protruding from the branch joint (14), and the diameter is increased by screwing a nut (15) incorporated on the side of the branch connector (13). The sleeve washer (16) is constructed so that it can be tightened and connected with the pressure of the portion (13 ').

[0003]

However, in such a conventional connecting structure, the surrounding branch joint (14) significantly increases the weight of the connecting portion and the through hole (11 ") portion. Since the pressure receiving seat surface (12) is directly provided in the main rail (11), it is impossible to obtain a sufficient pressure receiving seat surface (12) having a uniform width surface due to the circumferential shape of the main rail (11). Furthermore, the nut (15) has a screw-fastening structure with the projecting screw wall (14 ') on the side of the branch joint (14), so that the abutting engagement of the nuts (15) with each other for a long period of time can be ensured in the arrangement under vibration. There is a problem in that the joint portion is likely to be loosened, and leakage may occur.

The present invention has been made in view of the above-mentioned problems of the prior art. The branch joint has an extremely small shape as compared with the one surrounding the branch joint as in the prior art, and the entire product has a light weight. Its mounting and positioning is not easy, and the pressure receiving seat surface of the branch joint has a uniform width surface.
Moreover, the present invention provides a fixing structure for a branch joint for connecting a branch connector in a common rail and a method for forming the same, which can be sufficiently obtained, and in which the joint can be securely fixed and leakage due to loosening at the fixing portion can be eliminated. The purpose is.

[0005]

In order to achieve the above object, a first embodiment of the present invention has a plurality of main rails, which have a flow passage inside the shaft core, and are spaced from each other in the axial peripheral wall portion of the main rail. In the fixed structure of the branch joint, in which a branch connector having a through hole is provided, and a branch connecting body having a flow path communicating with the flow passage is connected to the peripheral surface portion of the through hole through a branch joint. A branch joint for connecting a branch connector having a hole is a screw hole, and a pressure receiving surface that is open outward at one end and is connected to a flow passage on the inside, and a screw wall, and a screw portion at the other end. The gist of the present invention is a fixing structure of a branch joint for branch connector connection in a common rail configured by screwing with a screw hole portion on the main rail side, and further, a screw formed between the screw hole and the screw portion. At least one of the contact parts at the joint or stepped part should be fixed by low welding. Are those that form.

In a second embodiment of the present invention, a peripheral wall portion in the axial direction of a main rail made of a thick and thin metal pipe material having a flow passage inside the shaft core is provided with a hole at a peripheral wall portion by a hole. A plurality of through-holes are provided, and the peripheral surface of each of the through-holes is threaded to form a screw hole, and on the other hand, following the internal flow path processing, a pressure-receiving seat surface processing that opens outward at one end is formed. A threaded portion formed by the other end is screwed into the threaded hole portion on the main rail side with a branch joint that is subjected to screwing and stepped processing and screwing on the outer peripheral side of the other end. The gist is a method of forming a fixed structure of a branch joint for connecting a branch connector in a common rail to be mounted, and further, after screwing a screw portion of the branch joint and a screw hole portion of the main rail side and attaching the screw portion in advance. Metal such as copper or copper alloy applied to at least one of By applying a heat-melting treatment with a metal plating material or a metal brazing material such as paste, ring, wire, etc. from the outside, at least one of the mutually abutted portions of the screwed portion or the stepped portion is further rolled. It is configured to be welded and fixed.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a part of a fixing structure of a branch joint for connecting a branch connector in a common rail constructed by a molding method of the present invention. FIG. 2 is a sectional view taken along a notch, FIG. 2 is a view corresponding to FIG. 1 according to another embodiment, FIG. 3 is a view corresponding to FIG. 1 according to yet another embodiment, and FIG. It is a corresponding figure, (1) is a main rail as a common rail, for example, a pipe diameter of 20 m / m and a thin wall thickness of about 8.0 m / m or less made of carbon steel pipe material for pressure piping. From a plurality of metal pipes, each of which has a flow passage (1 ′) having an inner diameter of 4.0 m / m or less and which has a space in the circumferential wall in the axial direction and which penetrates the flow passage by drilling. A through hole (1 ″) is formed, and the peripheral surface of the through hole is threaded to form a screw. (2 ') is made by forming a.

Further, (3) is a branch joint for connecting a branch connection body (not shown), in which a flow path (3 ') is provided in the shaft core portion by drilling or the like, and then one end portion is formed. To the outside, the processing of the pressure receiving surface (2) and the processing on the screw wall (2 ″), and the processing of the screw portion (4) connected to the stepped portion (6) at the other end. It will be.

Then, the threaded portion (4) formed by the other end of the branch joint (3) is screwed and attached to the screw hole (2 ') portion on the main rail (1) side, and then preferably in FIG. As shown in FIG. 4, at least one of the screw portion (4) and the screw hole (2 ') is plated with a metal brazing material such as copper or copper alloy in advance, or a paste, ring, foil or the like. A metal brazing material such as copper, brass, or nickel brazing material from the outside is heated and melted, so that the abutting portions of the screwed portions and / or the stepped portions (6) formed by the low brazing (5 ) And then fix it and configure it.

[0010]

As described above, the fixing structure of the branch joint for connecting the branch connector in the common rail according to the present invention and the forming method thereof are particularly effective for the screw hole (2 ') provided on the main rail (1) side. The threaded portion (4) on the side of the branch joint (3) provided with the pressure bearing surface (2) at one end is screwed and tightened, and more preferably, the mutually screwed portion or / and the stepped portion (6). By making the abutting part of (1) fixed by low welding (5), the branch joint (3) can be made into a compact shape and the entire product can be made lightweight, and its attachment and positioning can be made extremely easy. Further, by providing the pressure receiving seat surface (2) on the side of the branch joint (3), the width surface can be made uniform and can be sufficiently obtained, and further, the mutual screwing portion and / or the abutting portion can be formed. Fix the branch joint (3) by low welding (5) structure Etc. can be eliminated leakage by loosening form the real, can be said that a very useful invention.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a fixing structure of a branch joint for connecting a branch connector in a common rail configured by a molding method according to an embodiment of the present invention, the view being partially cut away.

FIG. 2 is a diagram corresponding to FIG. 1 according to another embodiment.

FIG. 3 is a view corresponding to FIG. 1 of the above, according to still another embodiment.

FIG. 4 is a view corresponding to FIG. 1 of the above, according to still another embodiment.

FIG. 5 is a partially cutaway cross-sectional view showing a conventional example near a fixing structure of a branch joint for connecting a branch connector.

[Explanation of symbols]

 1 Main Rail 1 "Through Hole 2 Pressure Bearing Surface 2'Screw Hole 2" Screw Wall 3 Branch Joint 3'Flow Path 4 Screw Part 5 Low Welding 6 Stepped Part

Claims (4)

[Claims] 1. A plurality of through-holes are provided at an axial peripheral wall portion of a main rail that forms a flow passage inside the shaft core with a space therebetween, and a flow passage leading to the flow passage is formed on a peripheral surface portion of the through-hole. In a fixed structure of a branch joint in which a branch connecting body having a passage is connected via a branch joint, a through hole (1 ″) portion of the main rail (1) is formed as a screw hole (2 ′), and one inside The branch joint (3) for connecting the branch connector having the pressure receiving surface (2) and the screw wall (2 ″) which are open outward at one end in connection with the flow path (3 ′) of the other end, and the other end. A fixed structure of a branch joint for connecting a branch connector in a common rail, characterized in that a screw portion (4) of the main portion is screwed into a screw hole (2 ') portion on the main rail (1) side. 2. A low-welding (5) fixing of at least one of an abutting portion of a threaded portion or a stepped portion (6) formed between the screw hole (2 ′) and the screw portion (4). The structure for fixing a branch joint for connecting a branch connector in a common rail according to claim 1, wherein the structure is fixed. 3. A plurality of through-holes are provided in a peripheral wall portion in the axial direction of a main rail made of a thick and thin metal pipe material having a flow passage inside the shaft core by holding holes at intervals to form a plurality of through holes. Each peripheral surface of the through hole is threaded to form a screw hole, and one side is subjected to flow path processing on one side, followed by pressure receiving seat surface processing and screw processing that open outward at one end, and the other end. A common rail characterized in that a branch joint, which is stepped and screwed, is provided on the outer peripheral side of the main rail, and the screw portion formed by the other end is screwed into the screw hole portion on the main rail side. Method for forming a fixed structure of a branch joint for connecting a branch connector in. 4. A plating process using a metal brazing material such as copper, which has been applied to at least one of the screw part and the screw hole in advance after screwing and mounting the screw part of the branch joint and the screw hole part on the main rail side. It is characterized in that at least one of the abutting portions of the screwed portions or the stepped portions formed by mutual welding is further low-welded and fixed by heat-melting treatment with a film or a metal brazing material from the outside. The method for forming a fixed structure of a branch joint for connecting a branch connector in a common rail according to claim 3.