JP2015151927A - delivery pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a delivery pipe for allowing easy assembly of a housing and a closing member while avoiding a sealing failure.SOLUTION: A delivery pipe 1 includes: a housing 10 including a main pipe part 11 which is a pipe having an opening 11A at least at one end, and at one end of which an end face 12 perpendicular to the axis is formed; a closing plate 20 having an opposite face 21 opposite to the end face 12, and arranged in parallel to the end face 12; and an O-ring 30 arranged encircling the opening 11A between the end face 12 and the opposite face 21, and held between the housing 10 and the closing plate 20.

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 strongly screwed in, the edge of the tip 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

  However, in the closed structure having the above-described configuration, the cap may be tilted with respect to the housing due to looseness of the screw or variation in dimensional accuracy between the housing and the cap. When such a situation occurs, there is a concern that the edge cannot contact the taper surface over the entire circumference, resulting in poor sealing. In order to avoid such a sealing failure, it is necessary to attach the cap by precisely aligning the shafts of the housing and the cap, which complicates the assembly process and increases the cost.

  The present invention has been completed based on the above circumstances, and an object of the present invention is to provide a delivery pipe capable of easily assembling a housing and a closing member while avoiding a sealing failure. .

  The delivery pipe of the present invention is a pipe having an opening at least at one end, a housing including a main pipe portion having an end face perpendicular to the axis at the one end, and an opposing face facing the end face, A closing member disposed in parallel with the end surface; and a seal portion disposed so as to surround the opening between the end surface and the facing surface and sandwiched between the housing and the closing member.

  According to said structure, a sealing part is ensured by arrange | positioning and pinching between the end surface of a housing, and the opposing surface of a closure member, ie, two surfaces perpendicular | vertical to the axis | shaft of a main pipe part. be able to. In other words, it is not necessary to precisely align the shaft between the housing and the closing member during assembly. For this reason, the assembly of the housing and the closing member can be easily performed while avoiding poor sealing.

  The housing may include a caulking portion that fixes the closing member while pressing it from a surface opposite to the facing surface.

  Here, when the cap is screwed and fixed as in the conventional configuration, the edge of the cap rotates against the tapered surface while rotating, and as a result, plating peeling or burrs may occur between the two. There is. However, in the above configuration, since the closing member does not rotate with respect to the housing, it is possible to avoid peeling of plating and generation of burrs.

  The seal portion may be a member attached to the closing member or a part of the closing member.

  According to said structure, compared with the case where a seal | sticker part is a member with which the housing was mounted | worn, or a part of housing, the process and assembly for manufacturing a delivery pipe are easy.

  The seal portion is a convex portion that protrudes from one of the opposing surface and the end surface toward the other, and one of the main pipe portion and the closing member that has the convex portion is a member that is harder than the other. May be.

  According to said structure, since the front-end | tip of a convex part digs into the other party member, the contact area of a convex part and the other party member becomes large, and a sealing performance improves.

  ADVANTAGE OF THE INVENTION According to this invention, the delivery pipe which can perform the assembly | attachment of a housing and a closure member easily can be provided, avoiding a sealing failure.

Sectional drawing of the delivery pipe of Embodiment 1 The expanded sectional view of the delivery pipe of Embodiment 1 Exploded sectional view of the delivery pipe of Embodiment 1 The expanded sectional view which shows the state before caulking a caulking part in the delivery pipe of Embodiment 1. Enlarged sectional view of the delivery pipe of Modification 1 The expanded sectional view of the delivery pipe of Embodiment 2. Exploded sectional view of the delivery pipe of the second embodiment Enlarged sectional view of the delivery pipe of Modification 2 Disassembled enlarged sectional view of the delivery pipe of Modification 2 Enlarged sectional view of the delivery pipe of Modification 3 Enlarged sectional view of the delivery pipe of Modification 4

<Embodiment 1>
Embodiment 1 of the present invention will be described with reference to FIGS. As shown in FIG. 1, the delivery pipe 1 of the present embodiment includes a housing 10, a closing plate 20 (corresponding to a closing member), and an O-ring 30 (corresponding to a seal portion).

  The housing 10 is made of metal and includes a main pipe portion 11, a plurality of branch cylinder portions 15, an accommodation cylinder portion 16, and a caulking portion 17, as shown in FIG. 1.

  The main pipe portion 11 is a cylindrical pipe having openings 11A and 11B at both ends, and its 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 portion 11 has a mounting groove 13. The mounting groove 13 is a groove for accommodating the O-ring 30. As shown in FIG. 3, the mounting groove 13 is a groove that is recessed from the end surface 12 inward (toward the other end of the main pipe portion 11). The mounting groove 13 has an annular shape, and the outer diameter of the annular ring is smaller than the outer diameter of the end face 12, and the inner diameter is larger than the outer diameter of the hole edge of the opening 11A. The mounting groove 13 is disposed so as to surround the opening 11A over the entire circumference.

  The main pipe portion 11 includes a plurality of branch holes 14 arranged side by side along the axial direction. Each branch hole 14 is a through hole that penetrates the tube wall of the main pipe portion 11.

  As shown in FIG. 1, the plurality of branching cylinder parts 15 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 15 is a cylinder that rises vertically from the hole edge of each branching hole 14 with respect to the main pipe part 11.

  The accommodating cylinder part 16 and the caulking part 17 are parts for attaching the closing plate 20. As shown in FIG. 3, the housing tube portion 16 is a tube extending from the end surface 12 of the main tube portion 11 along the axial direction of the main tube portion 11, and has an outer diameter equal to the outer diameter of the main tube portion 11 and an inner diameter. It is larger than the inner diameter of the main pipe portion 11. The accommodating cylinder part 16 is arranged coaxially with the main pipe part 11.

  As shown in FIG. 3, the caulking portion 17 is an annular portion that extends toward the central axis of the accommodating cylinder portion 16 from the tip of the accommodating cylinder portion 16 (the end opposite to the main pipe portion 11). The caulking portion 17 is disposed substantially parallel to the end surface 12.

  An inlet 18 for connection with an introduction pipe (not shown) connected to the fuel pump is disposed at the other end of the main pipe portion 11.

  The closing plate 20 and the O-ring 30 are members for closing the opening 11 </ b> A of the main pipe portion 11, and are arranged inside the accommodating cylinder portion 16.

  The closing plate 20 is a metal disk, and has an outer diameter larger than the diameter of the hole edge of the opening 11A and substantially equal to or smaller than the inner diameter of the housing cylinder portion 16 and has a thickness. Is substantially equal to the length of the storage tube portion 16 (the distance from the end surface 12 to the edge of the storage tube portion 16 opposite to the main tube portion 11). As shown in FIG. 2, the closing plate 20 is arranged inside the accommodating cylinder portion 16 so as to be perpendicular to the axis of the main pipe portion 11 (parallel to the end surface 12). One of the front and back surfaces of the blocking plate 20 is a facing surface 21 that is disposed perpendicular to the axis of the main pipe portion 11 and faces the end surface 12. The opposing surface 21 has an outer shape larger than the shape of the hole edge of the opening 11A. The caulking portion 17 is in contact with the other surface of the closing plate 20, and the closing plate 20 is fixed while being pressed toward the end surface 12 by the caulking portion 17.

  The O-ring 30 is a ring-shaped member made of a material having elasticity such as rubber, and is mounted in the mounting groove 13 and is disposed so as to surround the opening 11A over the entire circumference as shown in FIG. The O-ring 30 has a wire diameter larger than the groove depth of the mounting groove 13 (the distance from the bottom surface 13A to the end surface 12 of the mounting groove 13), and is sandwiched between the bottom surface 13A and the facing surface 21. Crushed. Thereby, the gap between the housing 10 and the closing plate 20 is sealed, and the opening 11A is closed.

  Next, a procedure for assembling the closing plate 20 and the O-ring 30 to the housing 10 will be described. As shown in FIG. 4, in a state before the closing plate 20 is assembled, the caulking portion 17 has a cylindrical shape that rises from the distal end of the housing tube portion 16 toward the side opposite to the main pipe portion 11.

  First, the O-ring 30 is mounted in the mounting groove 13. Next, the closing plate 20 is disposed inside the accommodating cylinder portion 16.

  Next, the closing plate 20 is pressed toward the end surface 12 using a pressure jig, and the O-ring 30 is crushed between the housing 10 and the closing plate 20. In this state, the caulking portion 17 is plastically deformed so as to be bent inward, is brought into contact with the closing plate 20, and is fixed so as to press the closing plate 20 toward the end surface 12.

  According to the above configuration, it is not necessary to precisely align the shaft between the housing 10 and the closing plate 20 during assembly. For this reason, the assembly of the housing 10 and the closing plate 20 can be easily performed while avoiding a sealing failure.

<Modification 1>
Modification 1 will be described with reference to FIG. In the delivery pipe 40 of this modification, not the housing 41 but the closing plate 44 (corresponding to the closing member) has a mounting groove 46, and the O-ring 30 is mounted on the closing plate 44. And different. In the following description, the same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  The delivery pipe 40 includes a housing 41, a closing plate 44, and an O-ring 30. The housing 41 is made of metal and includes a main pipe portion 42, a plurality of branching cylinder portions (not shown), the accommodating cylinder portion 16, and the caulking portion 17, as in the first embodiment.

  As in the first embodiment, the main pipe portion 42 is a cylindrical pipe having both ends open, and has an end face 43 perpendicular to the axial direction of the main pipe portion 42 at one end where the one opening 11A is disposed. Yes. Unlike the first embodiment, the end surface 43 does not have a mounting groove.

  The closing plate 44 is a metal disk, and the outer shape thereof is the same as that of the first embodiment. The closing plate 44 is disposed inside the accommodating cylinder portion 16 so as to be perpendicular to the axis of the main pipe portion 42 (parallel to the end surface 43). One of the front and back surfaces of the blocking plate 44 is a facing surface 45 that is disposed perpendicular to the axis of the main pipe portion 42 and faces the end surface 43. The caulking portion 17 is in contact with the other surface of the closing plate 44, and the closing plate 44 is fixed while being pressed toward the end surface 43 by the caulking portion 17.

  The closing plate 44 has a mounting groove 46. The mounting groove 46 is a groove for accommodating the O-ring 30. The mounting groove 46 is a groove that is recessed inward from the facing surface 45 (toward the side opposite to the main pipe portion 42). The mounting groove 46 has an annular shape, and the outer diameter of the annular ring is smaller than the outer diameter of the end face 43, and the inner diameter is larger than the outer diameter of the hole edge of the opening 11A.

  The O-ring 30 is mounted in the mounting groove 46 and is disposed so as to surround the opening 11A over the entire circumference. The O-ring 30 has a wire diameter larger than the groove depth of the mounting groove 46 (the distance from the bottom surface 46A of the mounting groove 46 to the end surface 43), and is sandwiched between the bottom surface 46A and the facing surface 45. Crushed. As a result, the gap between the housing 41 and the closing plate 44 is sealed, and the opening 11A is closed.

  The procedure for assembling the closing plate 44 to the housing 41 is the same as in the first embodiment.

  According to the above configuration, as in the first embodiment, it is possible to easily assemble the housing 41 and the closing plate 44 while avoiding a sealing failure. Furthermore, compared with the case where the mounting groove is provided in the housing, the processing for forming the mounting groove 46 and the assembly of the O-ring 30 are easier.

<Embodiment 2>
The second embodiment will be described with reference to FIGS. 6 and 7. In the delivery pipe 50 of this modification, a gap between the housing 51 and the closing plate 55 (corresponding to the closing member) is sealed by a rib 54 (corresponding to a sealing part or a convex part) provided on the housing 51 instead of the O-ring. This is different from the first embodiment. In the following description, the same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  The delivery pipe 50 includes a housing 51 and a closing plate 55. The housing 51 is made of metal and includes a main pipe portion 52, a plurality of branching cylinder portions (not shown), the accommodating cylinder portion 16, the caulking portion 17, and a rib 54, as in the first embodiment. .

  Similar to the first embodiment, the main pipe portion 52 is a cylindrical pipe having both ends opened, and has an end face 53 perpendicular to the axial direction of the main pipe portion 52 at one end where the one opening 11A is disposed. Yes.

  The rib 54 is a convex portion with a sharp tip that protrudes from the end surface 53 toward the closing plate 55. The rib 54 has an annular shape and is disposed so as to surround the opening 11A over the entire circumference.

  The closing plate 55 is a metal disc having the same shape as that of the first embodiment. The material of the blocking plate 55 is a metal that is softer than the metal that is the material of the housing 51. The closing plate 55 is disposed inside the accommodating cylinder portion 16 so as to be perpendicular to the axis of the main pipe portion 52 (parallel to the end surface 53). One of the front and back surfaces of the closing plate 55 is a facing surface 56 that faces the end surface 53 of the main pipe portion 52.

  The caulking portion 17 is in contact with the other surface of the closing plate 55, and the closing plate 55 is fixed while being pressed toward the end surface 53 by the caulking portion 17. The leading end of the rib 54 is recessed into the closing plate 55. As a result, the gap between the housing 51 and the closing plate 55 is sealed, and the opening 11A is closed.

  Next, a procedure for assembling the closing plate 55 to the housing 51 will be described. As shown in FIG. 7, in a state before assembling the closing plate 20, the caulking portion 17 has a cylindrical shape that rises from the tip of the housing tube portion 16 toward the side opposite to the main pipe portion 52.

  First, the closing plate 55 is disposed inside the accommodating cylinder portion 16. Next, the closing plate 55 is pressed toward the end surface 53 by using a pressurizing jig, and the tips of the ribs 54 are inserted into the closing plate 55. In this state, the caulking portion 17 is bent inward and brought into contact with the closing plate 55 to fix the closing plate 55.

  According to said structure, the assembly | attachment of the housing 51 and the obstruction | occlusion board 55 can be performed simply, avoiding the sealing failure similarly to Embodiment 1. FIG.

Further, the above configuration has the following advantages.
When the cap is screwed and fixed as in the conventional configuration, the edge of the cap pierces the taper surface while rotating, and as a result, there is a possibility that plating peeling or burrs may occur between the two. However, according to the above configuration, the tip of the rib 54 does not rotate with respect to the closing plate 55, so that it is possible to avoid plating peeling and burrs.
Furthermore, since the tip end of the rib 54 sinks into the closing plate 55, the contact area between the rib 54 and the closing plate 55 is increased, and the sealing performance is improved.

<Modification 2>
Modification 2 will be described with reference to FIGS. 8 and 9. In the delivery pipe 60 of the present modified example, not the housing 61 but the closing plate 65 (corresponding to the closing member) has ribs 68 (corresponding to the seal portion and the convex portion), and the material of the closing plate 65 is the material of the housing 61. The second embodiment is different from the second embodiment in that the metal is harder than the metal. In the following description, the same components as those of the second embodiment are denoted by the same reference numerals and description thereof is omitted.

  The delivery pipe 60 includes a housing 61 and a closing plate 65. The housing 61 is made of metal, and includes a main pipe portion 62, a plurality of branching cylinder portions (not shown), a storage cylinder portion 16, and a caulking portion 17, as in the second embodiment.

  As in the second embodiment, the main pipe portion 62 is a cylindrical pipe having both ends open, and has an end face 63 perpendicular to the axial direction of the main pipe portion 62 at one end where the one opening 11A is disposed. Yes.

  The closing plate 65 has a main body portion 66 and ribs 68. The main body 66 is a metal disk, and has an outer diameter larger than the diameter of the hole edge of the opening 11A and substantially equal to or smaller than the inner diameter of the housing cylinder portion 16, and has a thickness. Is substantially equal to the length of the accommodation tube portion 16 (the distance from the end surface 63 to the edge on the opposite side of the main tube portion 62 of the accommodation tube portion 16). The closing plate 65 is disposed inside the accommodating cylinder portion 16 so as to be perpendicular to the axis of the main pipe portion 62 (in parallel with the end face 63). One of the front and back surfaces of the main body 66 is a facing surface 67 that faces the end surface 63. The outer surface of the facing surface 67 is larger than the shape of the hole edge of the opening 11A.

  The rib 68 is a convex portion with a sharp tip that protrudes from the facing surface 67 toward the end surface 63. The rib 68 has an annular shape, and the outer diameter of the annular ring is smaller than the outer diameter of the end face 63, and the inner diameter is larger than the outer diameter of the hole edge of the opening 11A.

  The material of the closing plate 65 is a metal harder than the metal that is the material of the housing 61.

  The caulking portion 17 is in contact with the other surface of the closing plate 65, and the closing plate 65 is fixed while being pressed toward the end surface 63 by the caulking portion 17. The rib 68 is disposed so as to surround the opening 11 </ b> A over the entire circumference, and the tip thereof is recessed into the end surface 63. Thereby, the gap between the housing 61 and the closing plate 65 is sealed, and the opening 11A is closed.

  The procedure for assembling the closing plate 65 to the housing 61 is the same as in the first modification.

According to the above configuration, as in the second embodiment, the housing 61 and the closing plate 65 can be easily assembled while avoiding poor sealing. Further, since the tips of the ribs 68 do not rotate with respect to the end surface 63, it is possible to avoid plating peeling and burrs. Furthermore, since the tip of the rib 68 is recessed into the end surface 63, the contact area between the rib 68 and the end surface 63 is increased, and the sealing performance is improved.
In addition, the processing for forming the rib 68 is easier than in the case where the rib is provided in the housing.

<Modification 3>
Modification 3 will be described with reference to FIG. The delivery pipe 70 of this modification includes a housing 71 and a closing plate 75 (corresponding to a closing member). The present modification is different from the second embodiment in that the material of the closing plate 75 is a metal harder than the metal that is the material of the housing 71. In addition, the same code | symbol is attached | subjected to the structure similar to Embodiment 2, and description is abbreviate | omitted.

  The housing 71 includes a main pipe portion 72 having an end surface 73, a plurality of branching cylinder portions (not shown), a storage cylinder portion 16, a caulking portion 17, and a rib 74 (corresponding to a seal portion and a convex portion). doing. The main pipe portion 72, the end surface 73, and the rib 74 have the same shape as that of the second embodiment.

  The closing plate 75 has the same shape as that of the second embodiment, and is disposed inside the accommodating cylinder portion 16. One of the front and back surfaces of the closing plate 75 is a facing surface 76 that faces the end surface 73 of the main pipe portion 72. The material of the closing plate 75 is a metal that is harder than the metal that is the material of the housing 71.

  As in the second embodiment, the caulking portion 17 is in contact with the other surface of the closing plate 75. The closing plate 75 is fixed in a state of being pressed toward the end surface 73 by the caulking portion 17, and the rib 74 abuts against the facing surface 76 while being plastically deformed so that the tip thereof is crushed. It surrounds the opening 11A and is in close contact over the entire circumference. Thereby, the gap between the housing 71 and the closing plate 75 is sealed, and the opening 11A is closed.

  Next, a procedure for assembling the closing plate 75 to the housing 71 will be described. Similarly to the second embodiment, in a state before the closing plate 75 is assembled, the caulking portion 17 has a cylindrical shape that rises from the tip of the housing tube portion 16 toward the side opposite to the main pipe portion 72.

  First, the closing plate 75 is disposed inside the accommodating cylinder portion 16. Next, the closing plate 75 is pressed toward the end surface 73 by using a pressurizing jig, and is plastically deformed so that the tip of the rib 74 is crushed. In this state, the caulking portion 17 is bent inward and brought into contact with the closing plate 75 to fix the closing plate 75.

  According to said structure, the assembly | attachment of the housing 71 and the obstruction | occlusion board 75 can be performed simply, avoiding the sealing failure similarly to Embodiment 2. FIG. Further, since the tips of the ribs 74 do not rotate with respect to the closing plate 75, it is possible to avoid plating peeling and burrs.

<Modification 4>
Modification 4 will be described with reference to FIG. The delivery pipe 80 of the present modification includes a housing 61 and a closing plate 81 (corresponding to a closing member). This modification is different from Modification 2 in that the material of the blocking plate 81 is a metal that is softer than the metal that is the material of the housing 61. In addition, the same code | symbol is attached | subjected to the structure similar to the modification 2, and description is abbreviate | omitted.

  The blocking plate 81 includes a main body portion 82 having an opposing surface 83 and ribs 84 (corresponding to a seal portion and a convex portion). The main body 82, the facing surface 83, and the rib 84 have the same shape as that of the second modification. The material of the closing plate 81 is a metal that is softer than the metal that is the material of the housing 61.

  Similar to the second modification, the closing plate 81 is fixed by the caulking portion 17 while being pressed toward the main pipe portion 62. As a result, the rib 84 abuts against the end surface 63 while the tip thereof is plastically deformed, and the both 84 and 63 tightly surround the opening 11A over the entire circumference. Thereby, the gap between the housing 61 and the closing plate 81 is sealed, and the opening 11A is closed.

  The procedure for assembling the closing plate 81 to the housing 61 is the same as in the third modification.

  According to said structure, the assembly of the housing 61 and the obstruction | occlusion board 81 can be performed simply, avoiding the sealing failure similarly to the modification 2. In addition, since the tips of the ribs 84 do not rotate with respect to the end face 63, plating peeling and burrs can be avoided. In addition, compared with the case where the rib is provided in the housing, the processing for providing the rib 84 is easy.

<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 and the modification, the closing plates 20, 44, 55, 65, 75, 81 are metal disks, but the shape of the closing member is not limited to the above embodiment and the modification. For example, a polygonal plate or a cylindrical block may be used.

(2) In the above embodiment, the closing plates 20, 44, 55, 65, 75, 81 are fixed by the caulking portion 17. However, the fixing structure of the closing member is not limited to the above embodiment, and for example, an accommodating cylinder portion The closure member may be fixed by pressing the cap over the closure member.

DESCRIPTION OF SYMBOLS 1, 40, 50, 60, 70, 80 ... Delivery pipe 10, 41, 51, 61, 71 ... Housing 11, 42, 52, 62, 72 ... Main pipe part 11A ... Opening 12, 43, 53, 63, 73 ... End face 17 ... caulking part 20, 44, 55, 65, 75, 81 ... closing plate (closing member)
21, 45, 56, 67 ... opposing surface 30 ... O-ring (seal part)
54, 68, 74, 84 ... rib (seal part, convex part)

Claims (4)

A housing having an opening at least at one end, the main pipe having an end surface perpendicular to the axis at the one end;
A blocking member having a facing surface facing the end surface, and disposed parallel to the end surface;
A delivery pipe comprising a seal portion disposed between the end surface and the opposing surface so as to surround the opening and sandwiched between the housing and the closing member.   The delivery pipe according to claim 1, wherein the housing includes a caulking portion that fixes the closing member while pressing the closing member from a surface opposite to the facing surface.   The delivery pipe according to claim 1 or 2, wherein the seal portion is a member attached to the closing member or a part of the closing member.   The seal portion is a convex portion that protrudes from one of the facing surface and the end surface toward the other, and one of the housing and the closing member that has the convex portion is a member that is harder than the other. The delivery pipe according to claim 1 or 2.

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