JP2011052554A - Fuel delivery pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel delivery pipe improving the accuracy of positions about the central axis of an injector mounting member. <P>SOLUTION: The fuel delivery pipe includes a tubular main pipe 10 having a first fuel passage 11, the injector mounting member 20 provided with a projection-shaped protrusion 23 having a second fuel passage 22 for bringing the first fuel passage 11 into communication with an injector insertion part 21 and connected to the main pipe 10 with the protrusion 23 inserted in a through-hole 13 penetrating the pipe wall 12 of the main pipe 10, and an abutment part A for abutment by an outer peripheral face (first face) 14 formed on the main pipe 10 and by a recipient face (second face) 24 formed on the injector mounting member 20 abuttably against the outer peripheral face 14. The protrusion 23 is provided by press-fitting a connection member 30 formed with a communication hole 31 forming the second fuel passage 11 into a second fuel passage 11. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a fuel delivery pipe used for an engine.

  In Patent Document 1, a through hole that communicates with the flow path of the rail is provided in the peripheral wall portion of the main rail, and the connection end portion of the injector connection socket is inserted deeply into the through hole so that the socket front end portion is circulated from the rail inner peripheral surface. A fuel rail for a direct-injection gasoline engine configured to be joined to each other in a state of protruding to the inside of the road is disclosed.

  This fuel rail has a structure in which the socket tip protrudes from the inner peripheral surface of the rail to the inside of the flow path, and the main rail and the socket are joined to each other, so that fatigue stress generated at the joint of the socket is applied to the socket protrusion. This is mitigated by the offset between the internal pressure and the external pressure, and improves the internal pressure fatigue strength of the socket joint.

JP 2007-16668 A

  Some injectors for direct injection engines require the positional accuracy of the fuel injection holes of the injector (the positional accuracy around the central axis of the injector). On the other hand, since the injector is attached to the fuel delivery pipe via the socket, the position accuracy of the socket with respect to the fuel delivery pipe (position accuracy around the center axis of the socket) is required. However, in the fuel rail disclosed in Patent Document 1, the connection end portion of the socket is inserted into the through hole, and the connection end portion and the through hole are brazed and joined. There is a risk that the position of the through hole of the rail or the connection end portion around the central axis may not be determined.

  The present invention has been made in view of the above problems, and an object thereof is to improve the positional accuracy around the central axis (rotation direction) of an injector mounting member (injector connection socket).

  In order to solve the above technical problem, a first technical means taken in the present invention is to communicate a main member having a first fuel passage therein, and the first fuel passage and the injector insertion portion. A projecting projection having a second fuel passage is formed, and an injector mounting member connected to the main member by inserting the projection into a through-hole penetrating the wall surface of the main member, and formed on the main member And a contact portion with which a second surface formed on the injector mounting member comes into contact so as to be able to contact the first surface, and the contact portion is centered on a central axis of the through hole. The fuel delivery pipe is characterized by intersecting the circumference of the circle.

  According to a second technical means, in the first technical means, the protrusion is provided by press-fitting a connection member having a communication hole forming the second fuel passage into the second fuel passage. is there.

  The third technical means is that in the second technical means, the cross-sectional area of the communication hole is smaller than the cross-sectional area of the second fuel passage.

  A fourth technical means is that in any one of the first to third technical means, the main member and the injector mounting member are fixed by brazing.

  A fifth technical means is that in the fourth technical means, the brazing material used for the brazing is the brazing material containing Ni.

  A sixth technical means includes a main member having a first fuel passage therein, and a projecting protrusion having a second fuel passage communicating the first fuel passage and the injector fitting insertion portion, An injector mounting member that is connected to the main member by inserting a protrusion into a through-hole that penetrates the wall surface of the main member, a first surface formed on the main member, and the injector mounting that can contact the first surface An abutting portion with which a second surface formed on the member abuts, and the protrusion press-fits a connecting member in which a communication hole constituting the second fuel passage is formed inside the second fuel passage. The fuel delivery pipe is characterized by being provided.

  According to the first aspect of the present invention, since the abutting portion intersects the circumference of a circle centered on the central axis of the through hole, the rotation of the injector mounting member around the central axis of the through hole is restricted. The positional accuracy around the central axis of the through hole can be increased.

  According to the invention of claim 2, since the connecting member is used, the protrusion can be easily provided.

  According to the invention of claim 3, since the hole diameter of the communication hole is smaller than the passage diameter of the second fuel passage, transmission of the fluctuation of the fuel pressure generated in the second fuel passage by the opening / closing operation of the injector is suppressed to the first fuel passage. It can be an orifice.

  According to the invention of claim 4, since the main member and the injector mounting member are fixed by brazing, they can be firmly fixed. Therefore, it can suppress suitably that the fuel which has in the inside of a main member and an injector attachment member flows out outside unintentionally.

  According to the invention of claim 5, since the brazing material is a Ni-containing brazing material, it is possible to suppress the brazing material from corroding even when using a fuel that may corrode metal members such as bioethanol fuel due to white rust. it can.

1 is a front view of a fuel delivery pipe according to a first embodiment of the present invention. II sectional drawing of FIG. II-II sectional drawing of FIG. The principal part enlarged view of FIG. Sectional drawing of the fuel delivery pipe which concerns on the 2nd Example of this invention. III-III sectional drawing of FIG. Sectional drawing of the fuel delivery pipe which concerns on the 3rd Example of this invention. IV-IV plane of FIG.

  Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 is a front view of a fuel delivery pipe showing a first embodiment of the present invention, and FIG. 2 is a cross-sectional view showing a II cross section of FIG. 3 is a cross-sectional view showing a II-II cross section of FIG. 2, and FIG. 4 is an enlarged view of a main part of FIG.

  The fuel delivery pipe 100 includes a main pipe 10 and an injector mounting member 20. The main pipe 10 and the injector mounting member 20 are connected by inserting a protrusion 23 into the through hole 13.

  The main pipe 10 (main member) has a cylindrical shape (tubular), and has an outer peripheral surface 14 (first surface) that is a convex surface having an arcuate cross section and is constant in the axial direction. Through holes 13 (four places in this embodiment) penetrating 12 are provided. In the present embodiment, the main pipe 10 is made of a SUS material and has improved corrosion resistance against alcohol-containing fuel and the like. The main pipe 10 distributes fuel pumped from a fuel pump (not shown) to the injector (not shown) via the injector mounting member 20.

  The injector mounting member 20 includes an injector insertion portion 21 to which the injector is attached, a receiving surface 24 (second surface) whose cross section that can come into contact with the outer peripheral surface 14 is an arcuate concave surface, and the injector insertion portion 21 and the receiving portion. Second fuel passages 22 are provided in the surface 24 respectively. The receiving surface 24 is hollowed out in a cylindrical shape, exhibits a concave surface having the same curvature as the outer peripheral surface 14, and contacts the outer peripheral surface 14.

  On the receiving surface 24 side of the second fuel passage 22, a pipe member 30 (connecting member) having a communication hole 31 is press-fitted into the second fuel passage 22 so that one end 32 protrudes from the receiving surface 24. The pipe member 30 protruding from the receiving surface 24 forms a protrusion 23. As shown in the enlarged view of FIG. 4, a chamfer C is formed in the opening on the receiving surface 24 side of the second fuel passage 22, and the chamfer C is raised around the pipe member 30 when the pipe member 30 is press-fitted. In this case, a uniform gap can be secured between the outer peripheral surface 14 and the receiving surface 24. Further, the chamfer C serves as a guide for press fitting the pipe member 30 coaxially with the second fuel passage 22 when the pipe member 30 is press-fitted into the second fuel passage 22.

  The main pipe 10 and the injector mounting member 20 are connected so that the first fuel passage 11 and the second fuel passage 22 communicate with each other through the communication hole 31 by inserting the protrusion 23 into the through hole 13. The main pipe 10 and the injector mounting member 20 are connected so that the tip 25 of the protrusion 23 protrudes from the inner peripheral surface 15 of the first fuel passage 11.

  When the main pipe 10 and the injector mounting member 20 are connected, the outer peripheral surface 14 and the receiving surface 24 come into contact with each other to form the contact portion A. In FIG. 3, the contact portion A appears as parallel lines P <b> 1 and P <b> 2. When attempting to rotate around the center, it intersects with four locations G1, G2, G3, and G4 with a virtual trajectory drawn by a specific location of the injector mounting member 20. For this reason, the rotation of the injector mounting member 20 around the protrusion 23 (center axis S) is restricted. Thereby, positioning of the rotation direction around the protrusion 23 (center axis S) of the injector mounting member 20 can be ensured, and the positional accuracy in the rotation direction can be improved. In addition, it is sufficient that at least one place intersects.

  The main pipe 10 and the injector mounting member 20 are respectively located at the abutting portion A formed between the outer peripheral surface 14 and the receiving surface 24 and the fitting insertion portion B formed between the through hole 13 and the protruding portion 23. It is brazed. The contact portion A and the fitting insertion portion B are continuously arranged by providing the through hole 13 in the outer peripheral surface 14. Thereby, the contact part A and the insertion part B can be made to penetrate | penetrate and braze the brazing material arrange | positioned in one place continuously. Moreover, since the two places of the contact part A and the insertion part B are brazed, the connection strength of the main pipe 10 and the injector attachment member 20 can be improved. The brazing material is a Ni-containing brazing material.

  The tip portion 25 of the protrusion 23 is provided so as to protrude from the inner peripheral surface 15 of the first fuel passage 11. For this reason, as shown in FIG. 4, forces F <b> 1 and F <b> 2 applied to the inner peripheral surface 15 of the first fuel passage 11 and the inner peripheral surface 33 of the communication hole 31 to expand the through hole 13 by the pressure of the pumped fuel. Is reduced by the force F3 applied to the outer peripheral surface 26 of the protrusion 23, and the stress generated around the through hole 13 is relaxed.

  The hole diameter d of the communication hole 31 (cross-sectional area of the communication hole 31) is set smaller than the passage diameter D of the second fuel passage 22 (cross-sectional area of the second fuel passage 22). For this reason, the influence on the first fuel passage 11 of the fluctuation of the fuel pressure generated in the second fuel passage 22 by the opening / closing operation of the injector (not shown) inserted in the injector insertion portion 21 can be suppressed.

  Next, a second embodiment of the present invention will be described with reference to FIGS.

  FIG. 5 is a cross-sectional view of a fuel delivery pipe 200 showing a second embodiment of the present invention. 6 is a cross-sectional view taken along the line III-III in FIG.

  The second embodiment differs from the first embodiment in the shape of the contact portion 2A. Since other than this is the same as the first embodiment, the description thereof is omitted.

  The main pipe 210 (main member) has a rectangular tube shape (tubular shape), and has an outer peripheral surface 214 (first surface) composed of flat surfaces 214a and 214b having a rectangular cross section and a constant axial direction. The receiving surface 224 (second surface) of the injector mounting member 220 includes planes 224a and 224b that are perpendicular to each other and can contact the outer peripheral surface 214 of the main pipe 210.

  The outer peripheral surface 214 and the receiving surface 224 come into contact with each other to form a contact portion 2A. The contact portion 2A appears as parallel lines 2P1 and 2P2 in FIG. 6 and is centered on the central axis S of the through hole 213. Circumference 2G of a circle (a virtual trajectory drawn by a specific portion of the injector mounting member 220 when the injector mounting member 220 tries to rotate around the protrusion 223 with respect to the main pipe 210) and four locations 2G1, 2G2, Cross at 2G3, 2G4. For this reason, rotation around the protrusion 223 (center axis S) of the injector mounting member 220 is restricted. Thereby, positioning in the rotation direction around the protrusion 223 (center axis S) of the injector mounting member 220 can be ensured, and position accuracy in the rotation direction can be improved.

  The main pipe 210 and the injector mounting member 220 are brazed at the respective locations of the abutting portion 2A and the fitting insertion portion 2B. Since the contact portion 2A and the fitting insertion portion 2B are configured from a flat surface in the present embodiment, a uniform gap can be secured and the brazing quality can be improved.

  Next, a third embodiment of the present invention will be described with reference to FIGS.

  FIG. 7 is a cross-sectional view of a fuel delivery pipe 300 showing a third embodiment of the present invention. FIG. 8 is the IV-IV plane of FIG.

  The third embodiment differs from the first embodiment in the shape of the contact portion 3A. Since other than this is the same as the first embodiment, the description thereof is omitted.

  The main pipe 310 has a rectangular tube shape (tubular), and has an outer peripheral surface 314 (first surface) including a flat surface 314a having a flat cross section and a constant axial direction. The receiving surface 324 (second surface) of the injector mounting member 320 includes a flat surface 324a that can contact the outer peripheral surface 314 of the main pipe 310.

  The outer peripheral surface 314 and the receiving surface 324 are in contact with each other to form a contact portion 3A. The contact portion 3A appears as a line 3P1 in FIG. 8 and is a circle around the central axis S of the through hole 313. 3G (a virtual trajectory drawn by a specific portion of the injector mounting member 320 when the injector mounting member 320 rotates with respect to the main pipe 310 around the protrusion 323) intersects at two locations 3G1 and 3G2. For this reason, the rotation of the injector mounting member 320 around the protrusion 323 (center axis S) is restricted. Thereby, positioning in the rotation direction around the protrusion 323 (center axis S) of the injector mounting member 320 can be ensured, and position accuracy in the rotation direction can be improved.

  The main pipe 310 and the injector mounting member 320 are brazed at the respective locations of the contact portion 3A and the fitting insertion portion 3B. Since the contact portion 3A is configured from a single plane in this embodiment, the gap can be easily managed and the brazing quality can be improved.

10, 210, 310 ... main pipe (main member)
DESCRIPTION OF SYMBOLS 11 ... 1st fuel passage 12 ... Pipe wall 13, 213, 313 ... Through-hole 14, 214, 314 ... Outer peripheral surface (1st surface)
20, 220, 320 ... injector mounting member 21 ... injector insertion portion 22 ... second fuel passage 23, 223, 323 ... projection 24, 224, 324 ... receiving surface (second surface)
30 ... Pipe member (connection member)
100, 200, 300 ... Fuel delivery pipes A, 2A, 3A ... Abutment portions B, 2B, 3B ... Insertion portion D ... Passage diameter (cross-sectional area of second fuel passage)
d: Hole diameter (cross-sectional area of communication hole)
G, 2G, 3G ... Circumference

Claims (6)

A main member having a first fuel passage therein;
A protruding protrusion having a second fuel passage communicating the first fuel passage and the injector insertion portion is provided, and the protrusion is inserted into a through-hole penetrating the wall surface of the main member. An injector mounting member to be coupled;
A first portion formed on the main member and a contact portion on which the second surface formed on the injector mounting member comes into contact with the first surface so as to be able to contact the first surface;
The fuel delivery pipe according to claim 1, wherein the contact portion intersects a circumference of a circle centering on a central axis of the through hole. In claim 1,
The fuel delivery pipe according to claim 1, wherein the protrusion is provided by press-fitting a connection member having a communication hole forming the second fuel passage into the second fuel passage. In claim 2,
The fuel delivery pipe according to claim 1, wherein a cross-sectional area of the communication hole is smaller than a cross-sectional area of the second fuel passage. In any one of Claims 1-3,
The fuel delivery pipe, wherein the main member and the injector mounting member are fixed by brazing. In claim 4,
A fuel delivery pipe, wherein the brazing material used for the brazing is the Ni-containing brazing material. A main member having a first fuel passage therein;
A protruding protrusion having a second fuel passage communicating the first fuel passage and the injector insertion portion is provided, and the protrusion is inserted into a through-hole penetrating the wall surface of the main member. An injector mounting member to be coupled;
A first portion formed on the main member and a contact portion on which the second surface formed on the injector mounting member comes into contact with the first surface so as to be able to contact the first surface;
The fuel delivery pipe according to claim 1, wherein the protrusion is provided by press-fitting a connecting member having a communication hole forming the second fuel passage into the second fuel passage.

Images