JP2014169634A - Fuel rail - Google Patents

Abstract

To provide a fuel rail that can be easily attached to an internal combustion engine and can be shared.
A fuel from a fuel tank flows into a fuel inflow portion. The first pipe 30 is provided so that one end can be connected to the fuel inflow portion 20, and has a first flow path 31 through which fuel can flow. Four second pipes 40 are provided so that one end can be connected to the other end of the first pipe 30, and have a second flow path 41 through which fuel can flow. Four cup portions 50 are provided so as to correspond to the other ends of the four second pipes 40, respectively, and are formed so that the fuel injection valve 10 can be attached thereto. The central block 60 is provided so as to connect the fuel inflow portion 20 and one end of the first pipe 30. Two connection blocks 70 are provided to connect the other end of the first pipe 30 and one end of the second pipe 40.
[Selection] Figure 1

Description

  The present invention relates to a fuel rail that distributes fuel from a fuel supply source to fuel injection valves.

  Conventionally, a fuel rail provided with a plurality of pipes and a connection part for connecting the pipes is known. For example, in the fuel rail described in Patent Document 1, a plurality of resin pipes having the same shape are connected to each other by a connector having the same shape to share the members.

JP 2003-28028 A

  The fuel rail of Patent Document 1 includes a housing that covers a plurality of resin pipes and connectors. The connector is attached so as to directly cover the fuel injection valve attached to the internal combustion engine. Therefore, if the connector is rotated around the tube axis of the resin pipe, the attachment angle of the connector with respect to the fuel injection valve attached to the internal combustion engine can be finely adjusted.

  However, in the fuel rail of Patent Document 1, since the pivot of the connector is inserted and supported in the shaft hole of the housing, adjustment such as changing the interval between the connectors cannot be performed. Therefore, depending on the interval between the mounting holes of the fuel injection valve formed in the internal combustion engine, the fuel injection valve cannot be covered with a connector, and there is a possibility that the fuel rail cannot be attached to the internal combustion engine. Further, in the manufacturing process, it is necessary to change the interval between the shaft holes formed in the housing for each internal combustion engine in which the interval between the mounting holes of the fuel injection valve is different. Therefore, there is a possibility that sufficient sharing of members cannot be achieved.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a fuel rail that can be easily attached to an internal combustion engine and can share members.

The present invention is a fuel rail that is attached to an internal combustion engine together with a plurality of fuel injection valves that inject and supply fuel to a combustion chamber of the internal combustion engine and distributes fuel from a fuel supply source to the fuel injection valves. 1st piping, 2nd piping, a cup part, a center block, and a connection block are provided.
The fuel from the fuel supply source flows into the fuel inflow portion. The first pipe is provided so that one end can be connected to the fuel inflow portion, and has a first flow path through which fuel can flow. A plurality of second pipes are provided so that one end can be connected to the other end of the first pipe, and the second pipe has a second flow path through which fuel can flow. A plurality of cup portions are provided so as to correspond to the other ends of the plurality of second pipes, respectively, and are formed so that a fuel injection valve can be attached. The central block is provided to connect the fuel inflow portion and one end of the first pipe. A plurality of connection blocks are provided to connect the other end of the first pipe and one end of the second pipe.

In the present invention, for example, the second pipe is formed in an L shape, and the second pipe is rotated around the pipe axis with the connection block as a fulcrum, whereby the cup portion with respect to the fuel injection valve attached to the internal combustion engine is The mounting angle can be adjusted. Further, by changing the insertion amount of the second pipe with respect to the connection block, it is possible to adjust the interval between the mounting holes of the fuel injection valve formed in the internal combustion engine and the interval between the plurality of cup portions. Thereby, a fuel rail can be easily attached to an internal combustion engine.
Further, in the present invention, in the manufacturing process, for example, by changing the insertion amount of the second pipe with respect to the connection block, the internal combustion engine in which the interval between the mounting holes of the fuel injection valve is different using the same member (second pipe) A fuel rail that can be attached to the vehicle can be manufactured. Accordingly, the members can be shared.

The figure which shows the state which attached the fuel injection valve to the fuel rail by 1st Embodiment of this invention, and was attached to the internal combustion engine. (A) is a figure which shows the fuel rail by 1st Embodiment of this invention, (B) is the figure which looked at (A) from the arrow B direction. 2A is a view of FIG. 2B viewed from the direction of arrow III, and FIG. 2B is a view of FIG. 2A viewed from the direction of arrow B. FIG. (A) is a view showing the central block of the fuel rail according to the first embodiment of the present invention, (B) is a view of (A) seen from the direction of arrow B, and (C) is a view of (B) from the direction of arrow C. (D) is the DD sectional view taken on the line of (A). Sectional drawing which shows the connection block of the fuel rail by 1st Embodiment of this invention. Sectional drawing which shows the center block of the fuel rail by 2nd Embodiment of this invention.

Hereinafter, fuel rails according to a plurality of embodiments of the present invention will be described with reference to the drawings. Note that, in a plurality of embodiments, substantially the same components are denoted by the same reference numerals, and description thereof is omitted.
(First embodiment)
A fuel rail according to a first embodiment of the present invention is shown in FIGS.

  As shown in FIG. 1, the fuel rail 1 of the first embodiment is attached to, for example, an internal combustion engine (hereinafter referred to as “engine”) 2. The engine 2 is a four-cylinder engine having four cylinders 3. A combustion chamber 4 is formed in each cylinder 3. The engine 2 is driven using, for example, gasoline as fuel. Each combustion chamber 4 is connected to an intake port (not shown), and intake air is introduced into the combustion chamber 4 via the intake port.

The fuel injection valve 10 is attached to an attachment hole 5 formed so as to be connected to each of the four combustion chambers 4. That is, four fuel injection valves 10 are attached. The fuel injection valve 10 is attached so that the injection hole 11 is exposed in the combustion chamber 4. The fuel injected from the injection hole 11 of the fuel injection valve 10 is atomized and introduced into the combustion chamber 4 and combusts in the combustion chamber 4.
In the present embodiment, the fuel rail 1 is attached to the engine 2 together with the fuel injection valve 10, and distributes fuel from the fuel tank 6 as a fuel supply source to the fuel injection valve 10.

As shown in FIGS. 1-3, the fuel rail 1 is provided with the fuel inflow part 20, the 1st piping 30, the 2nd piping 40, the cup part 50, the center block 60, the connection block 70, the pressure sensor 80 grade | etc.,.
The fuel inflow portion 20 is formed in a cylindrical shape from a metal such as stainless steel. One end of the fuel pipe 8 is connected to one end of the fuel inflow portion 20. The other end of the fuel pipe 8 is connected to a discharge port of a fuel pump 7 that sucks and discharges fuel from the fuel tank 6. Thereby, the fuel from the fuel tank 6 flows into the fuel inflow portion 20.

  The 1st piping 30 is formed in the cylinder shape, for example with metals, such as stainless steel. As shown in FIG. 2B, the first pipe 30 is formed in an L shape by being bent at a substantially right angle in the middle of the axial direction, for example. The first pipe 30 is provided so that one end thereof is positioned in the vicinity of the fuel inflow portion 20, that is, connectable to the fuel inflow portion 20. The 1st piping 30 has the 1st flow path 31 (refer the dashed-dotted line shown to FIGS. 1-3) which can distribute | circulate a fuel inside. The first flow path 31 is formed along the tube axis Ax1 of the first pipe 30. As shown in FIGS. 2A and 2B, in the present embodiment, the first pipe 30 is positioned so that one ends thereof are opposed to each other and the tube axis Ax1 is on the same plane (first virtual plane P1). Two are provided.

The 2nd piping 40 is formed in the cylinder shape, for example with metals, such as stainless steel. The second pipe 40 has the same outer diameter and inner diameter as the first pipe 30. That is, the 1st piping 30 and the 2nd piping 40 are formed with the material obtained by cut | disconnecting the same metal pipe, for example. As shown in FIG. 2A, the second pipe 40 is formed in an L shape by being bent at a substantially right angle in the middle of the axial direction, for example. The second pipe 40 is provided so that one end thereof is positioned in the vicinity of the other end of the first pipe 30, that is, connectable to the other end of the first pipe 30. The 2nd piping 40 has the 2nd flow path 41 (refer the dashed-two dotted line shown to FIGS. 1-3) which can distribute | circulate a fuel inside. The second flow path 41 is formed along the tube axis Ax2 of the second pipe 40. As shown in FIGS. 2A and 2B, in the present embodiment, the second pipe 40 has one end facing the one first pipe 30, and the tube axis Ax <b> 2 is in the same plane ( Two are provided so as to be positioned on the second virtual plane P2). That is, a total of four second pipes 40 are provided.
Here, the 1st piping 30 and the 2nd piping 40 are arrange | positioned so that the 1st virtual plane P1 and the 2nd virtual plane P2 may orthogonally cross (refer FIG. 3 (B)).

  The cup part 50 is formed, for example with metals, such as stainless steel. The cup part 50 has a main body 51 and a fixing part 52. The main body 51 is formed in a cylindrical shape. The fixing portion 52 is formed in a cylindrical shape, and is formed integrally with the main body 51 so that the axis is parallel to the axis of the main body 51. The cup portion 50 is provided so that one end of the main body 51 is connected to the other end of the second pipe 40. The main body 51 and the second pipe 40 are connected by brazing, for example. Four cup portions 50 are provided so as to correspond to the other ends of the four second pipes 40, respectively.

As shown in FIG. 1, the main body 51 is formed such that the other end can be attached with the fuel injection valve 10. Moreover, the fixing | fixed part 52 is fixed to the engine 2 when the volt | bolt 9 is passed inside. Thereby, the fuel rail 1 is attached to the engine 2. Here, the four cup portions 50 are arranged at equal intervals.
As shown in FIG. 4, the central block 60 has a main body 61, a pipe connection hole 62, an inflow portion connection hole 63, a sensor connection hole 64, and the like. The main body 61 is formed in a rectangular parallelepiped shape as shown in FIGS.

  As shown in FIG. 4, the pipe connection hole 62 is formed in the main body 61 so as to connect the opposing surfaces of the main body 61. Here, the pipe connection hole 62 is formed so that the axis is positioned on the first virtual plane P1 and parallel to the second virtual plane P2. A predetermined amount of one end of each of the two first pipes 30 is inserted and connected to both ends of the pipe connection hole 62 (see FIG. 4D). The central block 60 and the first pipe 30 are connected by being brazed in the pipe connection hole 62.

  The inflow portion connection hole 63 is formed in the main body 61 so that one end side opens on a surface other than the surface where the end portion of the pipe connection hole 62 opens. Here, the inflow portion connection hole 63 is formed so that the axis is orthogonal to the first virtual plane P1 and parallel to the second virtual plane P2. The other end of the fuel inflow portion 20 is inserted into and connected to the inflow portion connection hole 63 (see FIG. 4D). The central block 60 and the fuel inflow portion 20 are connected by being brazed in the inflow portion connection hole 63. Here, the fuel inflow portion 20 is provided so that the axis is orthogonal to the first virtual plane P1 (see FIG. 3B).

An orifice 65 having an inner diameter smaller than that of the inflow portion connection hole 63 and the pipe connection hole 62 is formed between the inflow portion connection hole 63 and the pipe connection hole 62. The orifice 65 is formed to connect the other end side of the inflow portion connection hole 63 and the center of the pipe connection hole 62. As a result, the fuel in the fuel tank 6 flows through the fuel pipe 8 and the fuel inflow portion 20 into the inside of the central block 60, that is, into the inflow portion connection hole 63, the orifice 65, and the pipe connection hole 62. Guided to the first flow path 31 of the pipe 30.
Thus, the central block 60 connects the fuel inflow part 20 and one end of the two first pipes 30 by the internal inflow part connection hole 63, the orifice 65, and the pipe connection hole 62.

The sensor connection hole 64 is formed in the main body 61 so that one end side is opened on a surface other than the surface where the pipe connection hole 62 and the inflow portion connection hole 63 are opened. Here, the sensor connection hole 64 is formed so that the axis is parallel to the first virtual plane P1 and is orthogonal to the second virtual plane P2. A pressure sensor 80, which will be described later, is inserted and connected to the sensor connection hole 64 (see FIG. 4B). The central block 60 and the pressure sensor 80 are connected by being brazed in the sensor connection hole 64. Here, the pressure sensor 80 is provided to be parallel to the second virtual plane P2 (see FIG. 3B).
A sensor hole 66 having an inner diameter smaller than that of the sensor connection hole 64 is formed between the sensor connection hole 64 and the pipe connection hole 62. The sensor hole 66 is formed to connect the other end side of the sensor connection hole 64 and the center of the pipe connection hole 62.

  As shown in FIGS. 2 and 3, two connection blocks 70 are provided, one at each of the other ends of the two first pipes 30. As shown in FIG. 5, the connection block 70 has a main body 71 and pipe connection holes 72 and 73. The main body 71 is formed in a rectangular parallelepiped shape from a metal such as stainless steel.

  The pipe connection hole 72 is formed in the main body 71 so as to connect the opposing surfaces of the main body 71 to each other. Here, the pipe connection hole 72 is formed so that the axis is located on the intersection line of the first virtual plane P1 and the second virtual plane P2. A predetermined amount of one end of each of the two second pipes 40 is inserted and connected to both ends of the pipe connection hole 72. The connection block 70 and the second pipe 40 are connected by being brazed in the pipe connection hole 72.

  The pipe connection hole 73 is formed in the main body 71 so that one end side opens on a surface other than the surface where the end of the pipe connection hole 72 opens. Here, the pipe connection hole 73 is formed so that the axis is positioned on the first virtual plane P1 and orthogonal to the second virtual plane P2. The pipe connection hole 73 is formed so that the other end side is connected to the center of the pipe connection hole 72. A predetermined amount of the other end of the first pipe 30 is inserted and connected to the pipe connection hole 73 at one end. The connection block 70 and the first pipe 30 are connected by being brazed in the pipe connection hole 73.

  Thus, the connection block 70 connects the other end of the first pipe 30 and one end of the second pipe 40 by the internal pipe connection holes 73 and 72. As a result, the fuel that has flowed into the central block 60 from the fuel inflow portion 20 flows into the first pipe 30 (first flow path 31), the connection block 70, the second pipe 40 (second flow path 41), and the cup section 50. Is distributed to each fuel injection valve 10 via.

  The pressure sensor 80 as the pressure detection means is provided in the sensor connection hole 64 of the central block 60 as described above. The pressure sensor 80 has a detector 81 at the tip. The pressure sensor 80 is provided in the sensor connection hole 64 so that the detection unit 81 is exposed in the pipe connection hole 62 via the sensor hole 66 of the central block 60.

  The pressure sensor 80 can detect the pressure acting on the detection unit 81, that is, the pressure in the pipe connection hole 62. The pressure sensor 80 outputs a signal related to the pressure detected by the detection unit 81 to an electronic control unit (hereinafter referred to as “ECU”) (not shown). Thus, the ECU can detect the pressure in the central block 60, that is, in the fuel rail 1 including the first pipe 30 and the second pipe 40. For example, the ECU controls the operation of the fuel pump 7 based on the pressure detected by the pressure sensor 80 so that the pressure in the fuel rail 1 becomes a target pressure. Further, the ECU controls the operation of each fuel injection valve 10 based on the pressure detected by the pressure sensor 80 so that the amount of fuel injected from each fuel injection valve 10 becomes a target injection amount.

  In the present embodiment, the two first pipes 30 are both formed to have the same length. Moreover, all the four 2nd piping 40 is formed in the same length. That is, the first pipe 30 and the second pipe 40 have the same flow path length including the first flow path 31 and the second flow path 41 between the fuel inflow portion 20 and each fuel injection valve 10. It is formed to become. Thereby, the pressure pulsation when the fuel injection valve 10 is operated is equally transmitted from each fuel injection valve 10 to the central block 60. Therefore, the pressure disturbance in the vicinity of the detection unit 81 of the pressure sensor 80 is reduced.

  As described above, in the present embodiment, the second pipe 40 is connected to the connection block 70. Moreover, the 2nd piping 40 is formed in L shape. Therefore, in this embodiment, the attachment angle of the cup portion 50 with respect to the fuel injection valve 10 attached to the engine 2 can be adjusted by rotating the second piping 40 around the tube axis Ax2 with the connection block 70 as a fulcrum. It is. Further, by changing the insertion amount of the second pipe 40 with respect to the connection block 70, the interval between the mounting holes 5 of the fuel injection valve 10 formed in the engine 2 and the interval between the plurality of cup portions 50 are adjusted. can do. Thereby, the fuel rail 1 can be easily attached to the engine 2.

  In the present embodiment, in the manufacturing process, for example, by changing the insertion amount of the second pipe 40 with respect to the connection block 70, the mounting hole 5 of the fuel injection valve 10 is used using the same member (second pipe 40). It is possible to manufacture a fuel rail 1 that can be attached to an engine having different intervals. Accordingly, the members can be shared.

  In addition, the present embodiment further includes a pressure sensor 80 provided in the central block 60 and capable of detecting the pressure in the central block 60. And both the two 1st piping 30 is formed in the same length. Moreover, all the four 2nd piping 40 is formed in the same length. That is, the first pipe 30 and the second pipe 40 have the same flow path length including the first flow path 31 and the second flow path 41 between the fuel inflow portion 20 and each fuel injection valve 10. It is formed to become. Thereby, the pressure pulsation when the fuel injection valve 10 is operated is equally transmitted from each fuel injection valve 10 to the central block 60. Therefore, the pressure disturbance in the vicinity of the detection unit 81 of the pressure sensor 80 is reduced. As a result, the accuracy in detecting the pressure in the fuel rail 1 by the pressure sensor 80 can be improved.

In addition, since the two first pipes 30 are formed to have the same length, and the four second pipes 40 are formed to have the same length, the members can be shared.
In the present embodiment, the first pipe 30 and the second pipe 40 have the same outer diameter and inner diameter. Thereby, the 1st piping 30 and the 2nd piping 40 can be formed with the material obtained by cut | disconnecting the same metal pipe, for example. Therefore, it is possible to share the base material.

  In the present embodiment, the central block 60 has an orifice 65 inside. Thereby, since the pressure downstream of the orifice 65 can be reduced, the outer diameters of the first pipe 30 and the second pipe 40 can be reduced. Therefore, the manufacturing cost of the fuel rail 1 can be reduced.

(Second Embodiment)
FIG. 6 shows a part (central block) of the fuel rail according to the second embodiment of the present invention. The second embodiment is different from the first embodiment in the inside of the central block.
As shown in FIG. 6, in the second embodiment, the central block 60 has two pipe connection holes 62 and two orifices 65.

The two pipe connection holes 62 are formed in the main body 61 so that one end side of each of the facing surfaces of the main body 61 is opened. The inflow portion connection hole 63 is formed in the main body 61 so that one end side opens on a surface other than the surface where the end portion of the pipe connection hole 62 opens and is positioned between the two pipe connection holes 62. The two orifices 65 are respectively formed in the main body 61 so as to connect the other end side of the two pipe connection holes 62 and the inflow portion connection hole 63.
In the present embodiment, the sensor hole 66 is formed so as to be connected to the inflow portion connection hole 63.

  Thus, in the second embodiment, the central block 60 has two orifices 65. Thereby, since the pressure downstream of the orifice 65 can be reduced, the outer diameters of the first pipe 30 and the second pipe 40 can be reduced as in the first embodiment. Therefore, the manufacturing cost of the fuel rail can be reduced.

(Other embodiments)
In the above-described embodiment, an example is shown in which the fuel rail includes four second pipes and is applied to a four-cylinder engine. On the other hand, in another embodiment of the present invention, for example, one of the four second pipes may be removed and applied to a three-cylinder engine. Further, for example, two of the four second pipes may be removed and applied to a two-cylinder engine.

  In addition, the present invention can be applied to an 8-cylinder engine by using two fuel rails including the four second pipes described above. Furthermore, the present invention can be applied to a 6-cylinder engine by using two fuel rails including the above-described three second pipes.

In another embodiment of the present invention, the pressure detection means may not be provided. In addition, the first pipe and the second pipe may be formed so that the total flow path length of the first flow path and the second flow path is different between the fuel inflow portion and each fuel injection valve.
Moreover, in other embodiment of this invention, at least one of an outer diameter and an internal diameter may differ between 1st piping and 2nd piping.
In another embodiment of the present invention, the central block may not have an orifice inside.

Moreover, in other embodiment of this invention, the connection block may have an orifice inside like the center block of 1st Embodiment and 2nd Embodiment. In this case, since the pressure downstream of the orifice of the connection block can be reduced, the outer diameter of the second pipe can be reduced.
In another embodiment of the present invention, the first virtual plane and the second virtual plane need not be orthogonal.
In other embodiments of the present invention, the center block and the connection block are not limited to a rectangular parallelepiped shape, and may be formed in any shape such as a polyhedron shape, a polygonal column shape, a spherical shape, a cylindrical shape, or a cone shape. Good.
Thus, the present invention is not limited to the above-described embodiment, and can be implemented in various forms without departing from the gist thereof.

DESCRIPTION OF SYMBOLS 1 ... Fuel rail 20 ... Fuel inflow part 30 ... 1st piping 31 ... 1st flow path 40 ... 2nd piping 41 ... 2nd flow path 50 ... Cup part 60: Central block 70: Connection block

Claims (5)

A plurality of fuel injection valves (10) for injecting and supplying fuel to the combustion chamber (4) of the internal combustion engine (2) are attached to the internal combustion engine and distribute fuel from a fuel supply source (6) to the fuel injection valves. A fuel rail (1),
A fuel inflow portion (20) into which fuel from the fuel supply source flows;
A first pipe (30) provided with one end connected to the fuel inflow portion and having a first flow path (31) through which fuel can flow;
A second pipe (40) provided with a plurality of one ends connected to the other end of the first pipe and having a second flow path (41) through which fuel can flow;
A plurality of cup portions (50) provided to correspond to the respective other ends of the plurality of second pipes and configured to be attachable to the fuel injection valve;
A central block (60) provided to connect the fuel inflow portion and one end of the first pipe;
A plurality of connection blocks (70) provided to connect the other end of the first pipe and one end of the second pipe;
With fuel rail. Pressure detector (80) provided in the central block and capable of detecting the pressure in the central block;
In the first pipe and the second pipe, the total flow path length of the first flow path and the second flow path is equal between the fuel inflow portion and each fuel injection valve. The fuel rail according to claim 1, wherein the fuel rail is formed.   The fuel rail according to claim 1, wherein the first pipe and the second pipe have the same outer diameter and inner diameter.   The fuel rail according to any one of claims 1 to 3, wherein the central block has an orifice (65) therein.   The fuel rail according to claim 1, wherein the connection block has an orifice therein.

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