JP2005147075A - Fuel delivery pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable connection of an injector with a fuel delivery body at a slant and provide an excellent layout property for installation in a limited space, to easily and accurately connect a socket for connecting the injector with the fuel delivery body, and to provide a high airtightness between an injector holder and the injector for tight connection therebetween. <P>SOLUTION: In this fuel delivery pipe, a fuel inlet port 15 of an upper wall 14 communicates with a fuel outlet port 17 of an outer peripheral wall 11, with a state where an outer face of the upper wall 14 of a holder part 13 of the injector holder 12 is closely fixed to an outer face of the outer peripheral wall 11 of the fuel delivery body 10. A fuel supply pipe 16 is projected from an outer face of the fuel inlet port 15 of the upper wall 14 at right angle with respect to a wall face of the outer peripheral wall 11, the fuel supply pipe 16 is inserted and fixed in the fuel outlet port 17 of the outer peripheral wall 11, and a center axis of the holder part 13 is inclined with respect to a center shaft of the fuel supply pipe 16. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a fuel delivery pipe for supplying fuel fed from a fuel pressurizing pump of an electronic fuel injection type automobile engine into an intake pipe or a cylinder of the engine via an injector. An object of the present invention is to make it possible to dispose the fuel injector so as to be inclined with respect to the wall surface of the outer peripheral wall of the main body, and to improve the storage efficiency of the fuel delivery pipe.

  Conventionally, as shown in Patent Literature 1 to Patent Literature 6, a fuel delivery pipe is known in which a plurality of injectors are provided and fuel such as gasoline is supplied into a plurality of intake pipes and cylinders of an engine. Such a general injector holder (1) has a fuel inlet (6) in the center of the upper wall (3) of the bottomed cylindrical holder part (2) as in the conventional example 1 shown in FIG. A fuel supply pipe (7) is formed outside the fuel introduction port (6) in a direction perpendicular to the upper wall (3). The fuel supply pipe (7) is inserted into and fixed to the fuel outlet (8) provided in the outer peripheral wall (5) of the fuel delivery body (4) at a right angle to the wall surface of the outer peripheral wall (5). The outer surface of the wall (3) is brought into close contact with the outer peripheral wall (5) in parallel and fixed by brazing or welding. An injector (not shown) is inserted and connected into the holder portion (2) of the injector holder (1).

  Therefore, in the prior art example 1, the injector is arranged on an extension line in a direction perpendicular to the outer peripheral wall (5) of the fuel delivery body (4). However, in such a layout configuration of the fuel delivery body (4) and the injector, the arrangement angle of the entire fuel delivery pipe is a constant angle of 90 ° with respect to the fuel injection direction, and the installation place inside the engine room is It was limited and the degree of freedom of layout was low.

  In particular, in the case of a V-type engine or the like, due to restrictions on installation space, layout, etc., the intake pipes often intersect and incline and are connected to the cylinder head, and accordingly, the injector also has a fuel delivery body (4 There is also an engine with a design that is connected to be inclined with respect to the axial direction. Conventional examples 2 to 4 of the injector holder (1) for allowing the injector to be inclined and connected are shown in FIGS.

  First, in the conventional example 2 shown in FIG. 6, a fuel introduction port (6) is provided on the side surface of the holder (2), and a tubular spacer (9) is connected to the fuel introduction port (6) by brazing or welding. The spacer (9) is fixed to the outer surface of the fuel outlet (8) provided in the outer peripheral wall (5) of the fuel delivery body (4), and is perpendicular to the outer peripheral wall (5). The axis of the holder part (2) is connected and fixed in a direction inclined with respect to the axis of the fuel delivery body (4). By using this spacer (9), as shown in FIG. 6, the injector holder (1) is inclined and arranged on the wall surface of the fuel delivery body (4), so that the fuel delivery body (4) can be removed from the upper surface. When viewed, the injector can be connected while tilting with respect to the axis of the fuel delivery body (4) and tilted with respect to the axis of the fuel delivery body (4) when viewed from the side. ing.

  Further, in the conventional example 3 shown in FIG. 7 and FIG. 8, the fuel inlet (6) provided in the upper wall (3) of the holder part (2) is long and perpendicular to the upper wall (3). The supply pipe (7) is projected. As shown in FIG. 7, the fuel supply pipe (7) is inserted into the fuel outlet (8) of the fuel delivery body (4) in a direction perpendicular to the outer peripheral wall (5), and both are brazed or welded. The connection is fixed by etc. At this time, the fuel supply pipe (7) and the holder part (2) are arranged in a direction perpendicular to the outer peripheral wall (5) of the fuel delivery body (4). Then, in the next step, as shown in FIG. 8, the fuel supply pipe (7) is bent and deformed so that the holder portion (2) is inclined to the outer peripheral wall (5) wall surface of the fuel delivery body (4). Is. As another different connecting means, the fuel supply pipe (7) is bent and deformed in advance, and the inclined direction of the holder portion (2) is maintained by this bending deformation, and the fuel supply pipe (7) is connected to the outer peripheral wall (5). There is also a means to fix the connection to. Also in this case, the holder portion (2) is parallel to the axis of the fuel delivery body (4) when viewed from the top surface, but the axis of the fuel delivery body (4) when viewed from the side surface. Some of them are arranged to be inclined with respect to the axial center of the fuel delivery body (4) on both the upper surface and the side surface.

Further, in the conventional example 4 shown in FIG. 9, the injector holder (1) is formed without providing the fuel supply pipe (7), and the holder portion (2) is inclined with respect to the upper wall (3). ing. A fuel inlet (6) is provided at the center of the upper wall (3), and a plurality of fuel outlets (8) are provided in series on the outer peripheral wall (5) of the fuel delivery body (4). Then, the fuel inlet (6) is arranged facing the fuel outlet (8), the upper wall (3) of the injector holder (1) is brought into contact with the outer surface of the outer peripheral wall (5), TIG welding, By temporarily attaching by plasma welding or the like, the fuel lead-out port (8) and the fuel introduction port (6) are communicated to enable fuel supply from the fuel delivery body (4) to the injector. The outer periphery of the injector holder (1) and the fuel delivery body (4) are fixed to each other by brazing or welding.
JP-A-60-240867 JP-A-10-331743 Japanese Patent Laid-Open No. 11-2164 JP 2000-320422 A JP 2000-329030 A JP 2000-329031 A

  However, in the case where the spacer (9) is used as in the conventional example 2 shown in FIG. 6, there is a possibility that the work process such as brazing or welding and the number of parts are increased and the cost is increased. In addition, the brazing or welding area between the spacer (9) and the upper wall (3) and the outer peripheral wall (5) is small, and the connection strength between the fuel delivery body (4) and the injector holder (1) and durability against vibrations, etc. There was also a problem.

  7 and 8, when the fuel supply pipe (7) is bent and deformed after the injector holder (1) is attached to the outer peripheral wall (5) of the fuel delivery body (4), The holder part (2) may be deformed to cause a problem in the dimensional accuracy such as the roundness of the cylinder, and there is a possibility that the airtightness and the connection strength when the injector is connected to the holder part (2) are lowered. In addition, the fuel supply pipe (7) is simply connected to the outer peripheral wall (5) of the fuel delivery body (4) by brazing or the like, and the upper wall (3) is not tightly fixed to the outer peripheral wall (5). There is also a problem in the connection strength and stability of the injector holder (1), and there is a possibility that durability against pulsation and the like during fuel injection may be reduced. In addition, the length of the fuel supply pipe (7) must be long in order to bend and deform, and the entire fuel delivery pipe is bulky and requires a large volume, so that the layout is extremely poor.

  Further, in the conventional example 4 shown in FIG. 9, the injector holder (1) is not positioned with respect to the fuel delivery body (4) by any particularly precise means, and the fuel outlet (8) having a different inner diameter is faced. Since only the fuel introduction port (6) is arranged, there is a possibility that the center axis of each other is displaced. For this reason, there may be a problem in the smooth fuel supply to the injector through the fuel outlet (8) and the fuel inlet (6).

  In order to solve the above-described problems, the present invention increases the dimensional accuracy such as the roundness of the injector holder and increases the alignment with each other when the injector holder is connected and fixed with an inclination to the fuel delivery body. It is accurate and improves the airtightness and connection strength when the injector is connected and held, and enables fuel injection at a smooth and accurate injection angle. In addition, the strength of the connection between the fuel delivery body and the injector holder is increased, and the durability against vibration of the fuel delivery body and pulsation during fuel flow is improved. In addition, precise fixing work between the fuel delivery body and the injector holder is easily performed without the need for advanced manufacturing techniques, thereby increasing the productivity of the fuel delivery pipe. Moreover, the bulk of the fuel delivery pipe in the height direction is reduced to ensure high layout performance.

  In order to solve the above-mentioned problems, the first invention is a fuel delivery pipe provided with an injector holder for connecting an injector for injecting fuel in a fuel delivery main body to an intake pipe or a cylinder of an engine. With the upper wall outer surface of the holder part of the injector holder in close contact with the outer surface of the outer surface of the fuel delivery body, the fuel inlet on the upper wall and the fuel outlet on the outer wall communicate with each other and the outer surface of the fuel inlet on the upper wall The fuel supply pipe is formed so as to project at right angles to the wall surface of the outer peripheral wall, the fuel supply pipe is inserted and fixed in the fuel outlet port of the outer peripheral wall, and the center of the holder portion is centered on the central axis of the fuel supply pipe. The shaft is inclined.

  Further, the second invention is a fuel delivery pipe provided with an injector holder for connecting an injector for injecting fuel in the fuel delivery main body into an intake pipe or a cylinder of the engine, wherein the outer surface of the upper wall of the holder portion of the injector holder is provided. With the fuel delivery body in close contact with the outer surface of the outer peripheral wall, the fuel inlet on the upper wall communicates with the fuel outlet on the outer peripheral wall, and the fuel supply pipe is connected to the outer surface of the fuel outlet on the outer peripheral wall. The fuel supply pipe is inserted into and fixed to the fuel introduction port on the upper wall, and the central axis of the holder portion is inclined with respect to the central axis of the fuel supply pipe. Is.

  The fuel inlet is located at an eccentric position nearer to the tilt direction of the holder part than the center of the upper wall, and the inner end face of the opening of the injector holder is outward from the extension line of the inner peripheral face of the fuel supply pipe. You may form by the dimension alignment located in this.

  The present invention is configured as described above, and since the holder portion of the injector holder is inclined in advance, it is not necessary to bend or deform the fuel supply pipe or the holder portion after the injector holder is mounted. And the dimensional accuracy such as roundness can be improved. Therefore, it is possible to obtain high airtightness and connection strength with no fuel leakage at the connection between the injector holder and the injector, and to connect the injector to the inclined intake pipe or cylinder at a desired angle, which is smooth and accurate. It is possible to perform fuel injection at an injection angle.

  In addition, since the upper wall is tightly fixed to the outer peripheral wall, the connection strength between the injector holder and the fuel delivery body is improved, and the durability against pulsation during fuel injection, vibration of the fuel delivery body, etc. is improved. . In addition, the fuel supply pipe projecting from the upper wall or outer peripheral wall is inserted into the fuel outlet port on the outer peripheral wall or the fuel inlet port on the upper wall, so that the positioning when the injector holder is fixed to the fuel delivery body can be Therefore, it is possible to form a high-quality product at a low cost without requiring a special manufacturing technique. In addition, since the injectors can be inclined, the bulk of the fuel delivery pipe can be suppressed, and a fuel delivery pipe having a high degree of freedom in layout that can be installed in a narrow space or the like can be obtained.

  Hereinafter, the fuel delivery pipe according to the first embodiment of the present invention will be described in detail with reference to FIGS. 1 to 3. (10) is a cross-sectional shape perpendicular to the tube axis. The fuel delivery main body is connected to a fuel introduction pipe (not shown) at one end, and this fuel introduction pipe is connected to a fuel tank (not shown) via an underfloor pipe (not shown). Then, the fuel in the fuel tank is transferred to the fuel introduction pipe through the underfloor pipe, flows from the fuel introduction pipe to the fuel delivery body (10), and is injected from the injector (not shown) into the intake pipe and the cylinder. The

  In addition, the fuel delivery body (10) is provided with a plurality of injector holders (12) on the wall surface of the outer peripheral wall (11) that allow the injectors to be connected. For example, in the case of a 4-cylinder engine, four injector holders (12) are provided at a desired interval and angle in the case of an in-line 6-cylinder engine. In the case of a V-type engine, etc., due to restrictions on installation space, layout, etc., the cylinders are crossed, and the injector holder (12) is connected to the fuel delivery body (10) for connection with the crossed cylinders. It is inclined when viewed from the side with respect to the shaft core, but it is connected so as to be parallel when viewed from the top, or both when viewed from the top and from the side. In some cases, however, the fuel delivery body (4) is connected to be inclined with respect to the axis.

  The injector holder (12) of the present embodiment for enabling the inclined connection includes a holder portion (13) for connecting and holding the injector inside, and the upper wall (14) of the injector holder (10) of the fuel delivery body (10). It is tightly fixed to the outer peripheral wall (11) by brazing or welding. The upper wall (14) is provided with a fuel introduction port (15), and disposed on the outer surface of the fuel introduction port (15) at a right angle to the outer peripheral wall (11) of the fuel delivery body (10). The fuel supply pipe (16) is formed integrally with the upper wall (14) and connected and fixed. The fuel supply pipe (16) can be inserted into the fuel outlet (17) of the outer peripheral wall (11), and the outer diameter of the fuel supply pipe (16) is made larger than the inner diameter of the fuel outlet (17). With a slightly larger diameter, this fuel supply pipe (16) is press-fitted into the fuel inlet (17) and is held between the inner end surfaces of the fuel outlet (17) until brazing or fixing by welding, The fuel supply pipe (16) is held with a holding force that does not drop out carelessly, so that tack welding or the like can be omitted.

  The injector holder (12) has a holder portion (13) with respect to the central axis of the fuel supply pipe (16) as shown in FIG. 1, with the upper wall (14) being closely fixed to the outer peripheral wall (11). The central axis is inclined. Further, the fuel introduction port (15) and the fuel supply pipe (16) communicating with the fuel introduction port (15) are provided at an eccentric position closer to the inclination direction of the holder portion (13) than the center of the upper wall (14). As shown, the inner end surface of the opening portion (18) of the holder portion (13) is formed so as to be positioned outside the extension line of the inner peripheral surface of the fuel introduction port (15).

  In order to connect and fix the injector holder (12) to the fuel delivery body (10), as shown in FIG. 2, first, the fuel outlet (17) of the outer peripheral wall (11) is inserted into the fuel outlet (17). However, the fuel delivery main body (10) and the injector holder (12) are temporarily attached by press-fitting a slightly larger diameter fuel supply pipe (16) using a tool (20) such as a punch. Thus, since the fuel supply pipe (16) is press-fitted into the fuel outlet (17), the mutual alignment can be performed with high accuracy, and the fuel outlet (17) and the fuel inlet (15) Are arranged on the coaxial line, and the fuel supply pipe (16) is prevented from being accidentally dropped from the fuel outlet (17), so that the connection work can be performed efficiently.

  Also, by providing the fuel introduction port (15) at the eccentric position of the upper wall (14), the opening (18) of the holder part (13) is located outside the extension line of the inner peripheral surface of the fuel supply pipe (16). It is possible to press the tool (20), such as a punch, in parallel to the axis of the fuel supply pipe (16) without inclining it, causing distortion or deformation of the member, inadvertent inclination. Etc. can be prevented well, and the precision of the holder part (13) and other roundness and alignment accuracy can be improved.

  Next, the upper wall (14) of the injector holder (12) and the outer peripheral surface of the fuel supply pipe (16) are fixed to the outer peripheral wall (11) of the fuel delivery body (10) by brazing or welding. (14) can be brought into close contact with the outer peripheral wall (11) in parallel, and stable fixation with a wide contact area becomes possible. Accordingly, the durability of the injector holder (12) against vibrations of the fuel delivery main body (10), impact at the time of fuel injection, and the like is increased, and fuel injection from the injector can be performed smoothly.

  As shown in FIG. 1, the fuel supply pipe (16) is arranged at a right angle with respect to the outer peripheral wall (11) of the fuel delivery body (10) and the holder part (13) is inclined as shown in FIG. Is done. By connecting the injector to such a holder (13), it is possible to connect the injector to the wall surface of the outer peripheral wall (11) at an angle, and the injector can be connected to the inclined intake pipe or cylinder at a desired angle. Can be connected. Therefore, the entire fuel delivery pipe can be made compact and not bulky, can be installed even in a narrow space, and has a high degree of freedom in layout.

  Further, since the roundness of the holder portion (13) is high as described above, the injector can be firmly connected and held with high airtightness. The fuel in the fuel delivery body (10) flows into the fuel supply pipe (16) through the fuel outlet (17) and is supplied to the injector of the holder section (13). In addition, fuel can be injected smoothly.

  In the injector holder (12) of the first embodiment, the fuel introduction port (15) is provided at an eccentric position of the upper wall (14), and the holder portion (13 However, it is not always necessary to provide the opening (18) so as to be positioned outward from the extension line. Using the bent tool (20) or the like, the fuel supply pipe (16) can be press-fitted into the fuel outlet (17). Even in this case, the fuel supply pipe (16) and the fuel outlet (17) can be aligned with high accuracy.

  In the second embodiment shown in FIG. 3, the upper wall (14) of the injector holder (12) has a wide side that is point-symmetric with the side where the fuel introduction port (15) is provided, and the upper wall (14) and the holder. R between the wall surface of the part (13) is made small, and the surface area of the upper wall (14) is made wider than that of the first embodiment. And, by fixing this wide upper wall (14) to the outer peripheral wall (11) by brazing or welding, a stronger and more stable connection between the fuel delivery body (10) and the injector holder (12) The fuel injection from the injector can be performed more smoothly.

  In the first and second embodiments, the fuel supply pipe (16) is integrally provided on the outer surface of the upper wall (14) of the injector holder (12). However, in the third embodiment shown in FIG. 16) is provided on the outer peripheral wall (11) of the fuel delivery body (10). The fuel supply pipe (16) protruding from the outer peripheral wall (11) is integrally formed on the outer surface of the fuel outlet port (17) so as to protrude outwardly at right angles to the outer peripheral wall (11). The outer diameter of the pipe (16) is formed slightly larger than the inner diameter of the fuel introduction port (15) of the upper wall (14). When the injector holder (12) is connected and fixed to the fuel delivery body (10), the fuel supply pipe (16) protruding from the outer peripheral wall (11) is connected to the upper wall (14) of the injector holder (12). Both are temporarily attached by press-fitting into the fuel introduction port (15) provided in.

  Also in the third embodiment, the fuel introduction port (15) is provided at the eccentric position of the upper wall (14), and the opening portion (13) of the holder portion (13) is more than the extension line of the inner peripheral surface of the fuel supply pipe (16). 18) is dimensionally aligned so that it is located outward. As a result, the tool (20) can be easily inserted into the fuel supply pipe (16) through the opening (18), and the temporary attachment work between the fuel delivery body (10) and the injector holder (12), etc. It becomes possible to carry out precisely and easily. The upper wall (14) is firmly fixed to the outer periphery of the outer peripheral wall (11) and the fuel supply pipe (16) by brazing or welding, so that the connection strength and connection stability of the injector holder (12) are high and durable. In addition to being excellent in performance, the dimensional accuracy such as roundness is also high, and the connection of the injector can be maintained with high airtightness and connection strength.

  The length of the fuel supply pipe (16) is longer than the thickness of the outer peripheral wall (11) in the first and second embodiments, and the thickness of the upper wall (14) in the third embodiment. However, as another different embodiment, the formation length of the fuel supply pipe (16) may be the same as the thickness of the outer peripheral wall (11) or the upper wall (14).

Sectional drawing of the fuel delivery pipe of Example 1 of this invention. Sectional drawing which shows the temporary attachment process of a fuel delivery main body and an injector holder in Example 1. FIG. Sectional drawing of the fuel delivery pipe of Example 2 of this invention. Sectional drawing of the fuel delivery pipe of Example 3 of this invention. Sectional drawing of the fuel delivery pipe of the prior art example 1. FIG. The perspective view of the fuel delivery pipe of the prior art example 2. FIG. It is sectional drawing of the fuel delivery pipe of the prior art example 3, and shows the state before making a fuel supply pipe bend-deform. It is sectional drawing of the fuel delivery pipe of the prior art example 3, and the state which bent and deformed the fuel supply pipe is shown. Sectional drawing of the fuel delivery pipe of the prior art example 4. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Fuel delivery main body 11 Outer peripheral wall 12 Injector holder 13 Holder part 14 Upper wall 15 Fuel inlet 16 Fuel supply pipe 17 Fuel inlet 18 Opening

Claims (3)

In a fuel delivery pipe with an injector holder that connects an injector that injects fuel in the fuel delivery body into the engine intake pipe and cylinder, the upper wall outer surface of the holder portion of the injector holder is connected to the outer peripheral wall surface of the fuel delivery body. In the state of being tightly fixed, the fuel inlet on the upper wall communicates with the fuel outlet on the outer peripheral wall, and the fuel supply pipe is formed on the outer surface of the fuel inlet on the upper wall at right angles to the wall surface of the outer peripheral wall. A fuel delivery pipe characterized in that the fuel supply pipe is inserted and fixed to a fuel outlet of the outer peripheral wall, and the central axis of the holder portion is inclined with respect to the central axis of the fuel supply pipe. In a fuel delivery pipe with an injector holder that connects an injector that injects fuel in the fuel delivery body into the engine intake pipe and cylinder, the upper wall outer surface of the holder portion of the injector holder is connected to the outer peripheral wall surface of the fuel delivery body. The fuel inlet port on the upper wall and the fuel outlet port on the outer peripheral wall communicate with each other in a tightly fixed state, and the fuel supply pipe is on the outer surface perpendicular to the wall surface of the outer peripheral wall. A fuel delivery pipe characterized in that the fuel supply pipe is inserted into and fixed to a fuel inlet on the upper wall, and the central axis of the holder portion is inclined with respect to the central axis of the fuel supply pipe. The fuel inlet is located at an eccentric position nearer to the tilt direction of the holder than the center of the upper wall, and the inner end face of the injector holder opening is located outward from the extension line of the inner peripheral surface of the fuel supply pipe 3. The fuel delivery pipe according to claim 1 or 2, wherein the fuel delivery pipe is formed by dimension matching.

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