JP2015151928A - delivery pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a delivery pipe capable of responding to a request for making a small-sized formation and a cost reduction and the like.SOLUTION: A delivery pipe 1 is a pipe-like member having an opening 11A in at least one end of it and comprises a main pipe part 11 having an end surface 12 perpendicular to its axial direction and a closing plate 20 having a larger outer shape than that of a hole edge of the opening 11A and arranged to be overlapped on the end surface 12. The closing plate 20 has an abutting surface 20A abutted against the end surface 12 and an irradiation surface 20B that is an opposite side surface of the abutting surface 20A. High energy beam is irradiated against the irradiation surface 20B to perform overlapped welding operation to make a welded part where a part of the main pipe part 11 and a part of the closing plate 20 are connected to each other. The welded part is arranged around the opening 11A.

Description

  The present invention relates to a delivery pipe.

In an internal combustion engine having a plurality of cylinders, a delivery pipe is used as means for distributing fuel pumped from a single fuel supply pipe to injectors individually provided for each cylinder.
The delivery pipe includes a housing provided with a plurality of branching cylinders for connection to the injector, and a cap that closes one end of the housing. The other end of the housing is connected to a fuel supply pipe, and the fuel supplied from the fuel supply pipe is distributed to each injector through a delivery pipe.

  A metal seal structure may be employed as a structure for closing the housing by the cap. In this metal seal structure, a cap having a male screw portion is screwed to a female screw portion disposed at one end of the housing. When the cap is screwed in strongly, the edge of the tip of the cap strongly contacts the taper surface disposed on the inner peripheral surface of the housing and is plastically deformed to form a metal seal. Thus, fuel does not leak from the gap between the cap and the housing (see Patent Document 1).

JP 2012-136916 A

  In recent years, it has become difficult to secure a space for installing various components in the engine room due to a demand for space saving of the engine. Furthermore, with the globalization of the automobile industry, further cost reduction has been demanded.

  The present invention has been completed based on the above-described circumstances, and an object thereof is to provide a delivery pipe that can meet demands for downsizing and cost reduction.

  The delivery pipe of the present invention is a tubular member having an opening at least at one end, and has a main pipe portion having an end surface perpendicular to the axial direction at the one end and a shape larger than the shape of the hole edge of the opening. A closing member disposed to overlap the end surface, the closing member having a contact surface that contacts the end surface, and an irradiation surface that is a surface opposite to the contact surface. A welded portion in which a part of the main pipe part and a part of the closing member are joined by performing superposition welding by irradiating a surface with a high energy beam is disposed so as to surround the opening.

  According to the above configuration, compared to the conventional configuration in which the cap is screwed to one end of the housing, the housing can be shortened and the processing cost of the housing can be reduced to the extent that it is not necessary to provide the female screw portion at one end of the housing. it can.

  The welded portion may include a first welded portion disposed at least around the opening, and a second welded portion disposed around the first welded portion.

  According to the above configuration, even if welding failure occurs in one of the first welded portion and the second welded portion, the sealability can be ensured by the other, so the seal between the housing and the closing member Can be made more reliable.

  ADVANTAGE OF THE INVENTION According to this invention, the delivery pipe which can respond to a request | requirement, such as size reduction and cost reduction, can be provided.

Cross-sectional view of the delivery pipe of the embodiment Partial enlarged sectional view of the delivery pipe of the embodiment The side view which looked at the delivery pipe of embodiment from the obstruction board side

<Embodiment>
An embodiment of the present invention will be described with reference to FIGS. The delivery pipe 1 of this embodiment includes a housing 10 and a closing plate 20 (corresponding to a closing member).

  The housing 10 is made of metal, and includes a main pipe portion 11 and a plurality of branching cylinder portions 14. The housing 10 is a member formed by forging. That is, the housing 10 is a member formed by forming a metal material such as a carbon steel material for mechanical structure by forging, and then performing quenching, tempering, plating, or the like as necessary.

  The main pipe portion 11 is a cylindrical pipe having openings 11A and 11B at both ends, and the internal space serves as a fuel supply path. The main pipe part 11 has an end face 12 perpendicular to the axis of the main pipe part 11 at one end thereof (an end part where the one opening 11A is disposed).

  The main pipe part 11 includes a plurality of branch holes 13 arranged along the axial direction. Each branch hole 13 is a through hole that penetrates the tube wall of the main pipe portion 11.

  The plurality of branching cylinder parts 14 are arranged on the outer peripheral surface of the main pipe part 11 along the axial direction of the main pipe part 11. Each branching cylinder part 14 is a cylinder that rises perpendicularly to the main pipe part 11 from the hole edge of each branching hole 13.

  The main pipe portion 11 has an inlet 15 at the other end (the end where the other opening 11B is disposed). The inlet 15 is a portion for connection to an introduction pipe (not shown) connected to the fuel pump.

  The closing plate 20 is a metal disk and has an outer diameter substantially equal to the outer diameter of the main pipe portion 11. One surface of the obstructing plate 20 is a contact surface 20 </ b> A that contacts the end surface 12. The closing plate 20 is disposed perpendicular to the axial direction of the main pipe portion 11 so that the contact surface 20A comes into contact with the end surface 12, and is fixed to the main pipe portion 11 by welding.

  The main pipe portion 11 and the closing plate 20 are joined by overlap welding. Overlap welding is a process where two members are overlapped and irradiated with a high energy beam such as a laser beam or an electron beam from one member side, and the melted portion that is melted by the beam penetrates one member to the other member. It is a welding technique that joins the two by melting and solidifying them together. In the present embodiment, a laser beam is irradiated on a surface (irradiation surface 20B) opposite to the contact surface 20A of the closing plate 20 superimposed on the main pipe portion 11, and the melted portion melted by the energy of the laser beam is blocked. The main pipe portion 11 and the closing plate 20 are joined by melting and solidifying the closing plate 20 and the main pipe portion 11 together so as to reach the main pipe portion 11 through the plate 20.

  The main pipe portion 11 and the closing plate 20 have a welded portion M that is formed over both by overlap welding. The welded part M is a part where the closing plate 20 and a part of the main pipe part 11 are melted together and then solidified in the welding process. The welded portion M seals the gap between the main pipe portion 11 and the closing plate 20.

  The welded portion M is an area where the closing plate 20 and the main pipe portion 11 overlap as viewed from the irradiation surface 20B side (outside the hole edge of the opening 11A and inside the outer peripheral surfaces of the main pipe portion 11 and the closing plate 20). The region 11) is disposed so as to surround the opening 11A over the entire circumference. The welded part M is arranged from the irradiation surface 20B to a position slightly deeper than the end surface 12 of the main pipe part 11 in the depth direction (a direction parallel to the axial direction of the main pipe part 11).

In the present embodiment, an example in which the welds M are arranged in a double manner is shown. That is, the weld portion M includes a first welded portion M ₁ of annular arranged an opening 11A surrounds the entire periphery, has an inner diameter larger than the outer diameter of the first welded portion M _1, the first welding portion the M ₁ and a second weld portion M ₂ of the annular arranged enclosing the entire circumference.

  Next, a process of joining the main pipe portion 11 and the closing plate 20 by overlap welding will be described. In the present embodiment, a description will be given by taking as an example a process of performing overlap welding using a laser.

  First, the closing plate 20 is overlapped on the end surface 12 of the main pipe portion 11 with the contact surface 20 </ b> A facing the end surface 12.

  Next, a laser beam is irradiated toward the irradiation surface 20B. At this time, the scanning trajectory of the laser beam is a region where the main tube portion 11 and the closing plate 20 overlap each other when viewed from the irradiation surface 20B side (outside the hole edge of the opening 11A, the main tube portion 11 and the closing plate 20). Irradiation is carried out so as to draw a double circle on the inner side of the periphery of. The irradiation intensity of the laser beam may be sufficient as long as the melted portion melted by the laser beam reaches the main pipe portion 11 through the closing plate 20. Due to the energy of the irradiated laser beam, both the closing plate 20 and a part of the main pipe portion 11 are melted and solidified to form a welded portion M.

  As described above, according to the present embodiment, the closing plate 20 is disposed so as to overlap the end surface 12 of the main pipe portion 11, and the main surface is obtained by irradiating the irradiation surface 20B of the closing plate 20 with a high energy beam and performing overlap welding. A welded part M in which a part of the part 11 and a part of the closing plate 20 are joined is disposed so as to surround the opening 11 </ b> A of the main pipe part 11. According to such a configuration, compared to the conventional configuration in which the cap is screwed to one end of the housing, the housing 10 can be shortened to the extent that it is not necessary to provide the female screw portion at one end of the housing 10. Processing cost can be reduced.

Further, the weld portion M has a first weld portion M ₁ and the second and the weld portion M _2. According to this structure, even if the welding defect occurs in one of the first weld M ₁ and the second welded portion M _2, since it is possible to ensure the sealing property by the other, a housing 10 closed The seal with the plate 20 can be made more reliable.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) In the above embodiment, the closing plate 20 has an outer diameter that is substantially equal to the outer diameter of the main pipe portion 11, but the shape and size of the closing member are not limited to those in the above embodiment, and the welded portion It is only necessary to have a shape and a size that can secure a space for placement.

(2) In the above embodiment, the welded portion M had a first weld portion M ₁ and the second welded portion M _2, weld be formed by only the first weld I do not care. Or the 3rd, 4th or more welded part may be arrange | positioned inside the 1st welded part or the outer side of the 2nd welded part.

(3) In the above-described embodiment, the step of performing the overlap welding by irradiating the laser beam has been described as an example. However, for example, the overlap welding may be performed by irradiating the electron beam.

DESCRIPTION OF SYMBOLS 1 ... Delivery pipe 11 ... Main pipe part 11A ... Opening 12 ... End surface 20 ... Closure board (closure member)
20A ... contact surface 20B ... irradiated surface M ... weld _{M 1} ... first welding portion _{M 2} ... second welding portion

Claims (2)

A tubular member having an opening at least at one end, the main pipe having an end surface perpendicular to the axial direction at the one end;
A closing member that has an outer shape larger than the shape of the hole edge of the opening and is arranged to overlap the end surface;
The blocking member has a contact surface that contacts the end surface, and an irradiation surface that is a surface opposite to the contact surface;
A welded part in which a part of the main pipe part and a part of the closing member are joined by irradiating the irradiated surface with a high-energy beam and performing overlap welding is disposed surrounding the opening, Delivery pipe.   The welded portion has at least a first welded portion arranged to surround the opening and a second welded portion arranged to surround the first welded portion. Delivery pipe as described.

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