JP2016156382A - Fuel rail and fuel injection device using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuel rail which inhibits interference with another member provided in an internal combustion engine.SOLUTION: A rail body 21 is formed into a cylindrical shape and has an inflow port 23 into which a fuel from a fuel supply source 11 flows. Protruding parts 24 are formed at predetermined intervals in an axis Ax1 direction of the rail body 21. An extension part 25 is formed so as to extend from the protruding part 24 in a direction substantially perpendicular to the axis Ax1 of the rail body 21 and inserted into a hole part 4 which connects an exterior part of an engine 1 to a combustion chamber 2. A connection part 28 is formed at a side of each extension part 25 which is opposite to the protruding part 24. One end of a fuel injection valve 50 housed in the hole part 4 is connected to the connection part 28. A bracket to which a wire harness may be attached is provided in each protruding part.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a fuel rail and a fuel injection device using the same.

  Conventionally, a fuel rail that distributes fuel to a plurality of fuel injection valves that inject fuel into an internal combustion engine combustion chamber is known. For example, the fuel rail described in Patent Document 1 is attached to the side of a cylinder head of an internal combustion engine. In this internal combustion engine, an end portion on the injection hole side of the fuel injection valve is inserted into a hole formed on the side of the cylinder head, and a fuel rail is connected to an end portion on the opposite side to the injection hole of each fuel injection valve. Parts are connected. Then, fuel is injected from the fuel injection valve located obliquely above the combustion chamber into the combustion chamber. That is, this internal combustion engine is a side injection type internal combustion engine. In the case of a side injection type internal combustion engine, the hole into which the fuel injection valve is inserted is usually formed short. Therefore, in the fuel rail of patent document 1, the connection part to which a fuel injection valve is connected is formed short. A plurality of the connecting portions are formed so as to protrude from the rail body of the fuel rail in a cylindrical shape in a direction perpendicular to the axis of the rail body, and at a predetermined interval in the axial direction of the rail body.

US Patent Application Publication No. 2010/0275883

  By the way, as a method of injecting fuel into the combustion chamber of the internal combustion engine, in addition to the above-described side injection type, a fuel injection valve is provided at the center of the upper end of the combustion chamber, There is a center injection type that injects fuel toward. In the case of a center injection type internal combustion engine, the hole for inserting the fuel injection valve is formed so as to extend in the vertical direction of the cylinder head. Since the cylinder head is generally large in the vertical direction, in the case of a center injection type internal combustion engine, the hole into which the fuel injection valve is inserted is formed long. Therefore, when it is going to attach the fuel rail of patent document 1 to a center injection type internal combustion engine, it is necessary to form a connection part long in an axial direction.

  However, when a fuel rail whose connection portion is simply elongated is attached to a center injection type internal combustion engine, for example, if a spark plug is provided between a plurality of holes formed in the longitudinal direction of the cylinder head, There is a risk of interference between the plug and the rail body. When the spark plug and the rail body interfere with each other, the rail body cannot be disposed as close as possible to the cylinder head, so that the fuel rail partially protrudes from the cylinder head.

  On the other hand, when the rail body is disposed as close as possible to the cylinder head, it is conceivable that the spark plug is disposed in the left-right direction of the rail body. However, if the spark plug is arranged in the left-right direction of the rail body, the size of the cylinder head in the left-right direction may increase.

  The present invention has been made in view of the above problems, and an object thereof is to provide a fuel rail capable of suppressing interference with other members provided in an internal combustion engine, and a fuel injection device using the same. It is in.

  The invention according to claim 1 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. The rail body, the protruding portion, the extending portion, and the connecting portion are provided. The rail body is formed in a cylindrical shape and has an inflow port into which fuel from a fuel supply source flows. A plurality of protrusions are formed at predetermined intervals in the axial direction of the rail body. The extending portion is formed so as to extend in a direction substantially perpendicular to the axis of the rail body from the protruding portion, and is inserted into a hole portion that connects the outside of the internal combustion engine and the combustion chamber. The connecting portion is formed on the side opposite to the protruding portion of the extending portion. One end of the fuel injection valve accommodated in the hole is connected to the connection portion. The protrusion is provided with a bracket to which a wire harness for supplying electric power to the fuel injection valve can be attached.

  The fuel rail of the present invention is assumed to be attached to the internal combustion engine so as to be connected to a plurality of fuel injection valves provided at the center of the upper end of the combustion chamber of the internal combustion engine. That is, the internal combustion engine to which the fuel rail is attached assumes a center injection type internal combustion engine. Therefore, the hole in which the fuel injection valve is accommodated is formed relatively deep. In the present invention, since the fuel rail has the extending portion, the fuel inside the rail body is distributed to the fuel injection valve provided in the deep position of the hole of the internal combustion engine, that is, in the vicinity of the combustion chamber, via the extending portion. can do.

Further, in the present invention, since the extending portion and the rail main body are connected by the protruding portion, the rail main body has an end on the opposite side of the hole from the combustion chamber when the fuel rail is attached to the internal combustion engine. In the end face of the internal combustion engine in which the opening is opened, it is arranged at a position offset in the surface direction by the length of the protrusion from the hole. Therefore, a space having a predetermined size can be secured between the plurality of protrusions. Therefore, even if other members such as a spark plug are provided between a plurality of holes formed so as to be aligned in the front-rear direction of the internal combustion engine, for example, the interference between the other members and the rail body can be suppressed. it can. Further, by suppressing the interference between the fuel rail and the other members, it is possible to prevent a part of the fuel rail from greatly protruding from the internal combustion engine.
In the internal combustion engine to which the fuel rail of the present invention is attached, a spark plug or the like can be disposed between the plurality of holes arranged in the front-rear direction, so that it is perpendicular to the left-right direction of the internal combustion engine, i. The size of the direction can be reduced.

The invention according to claim 2 is characterized in that the bracket is provided on the opposite side of the rail body of the protruding portion.
The invention according to claim 3 is characterized in that the connecting portion has a groove (27).
The invention according to claim 4 is characterized in that the extending portion is longer than the distance between the adjacent protruding portion and the protruding portion among the plurality of protruding portions.

  A fifth aspect of the present invention is a fuel injection device including the fuel rail, the fuel injection valve, and the wire harness according to any one of the first to fourth aspects. The fuel injection valve is connected to a housing in which an injection hole is formed, a valve member that can open and close the injection hole by reciprocating in the housing, an electromagnetic drive unit that drives the valve member, and the electromagnetic drive unit The end of the housing opposite to the nozzle hole is connected to the connecting portion of the fuel rail and is accommodated in the hole of the internal combustion engine. The wire harness includes a first connector to which an end of the power harness connected to the power source is connected, a second connector connected to the electric connector of the fuel injection valve, and a conductor connecting the first connector and the second connector. Have. The present invention is an invention of a fuel injection device using the fuel rail according to claim 1. Therefore, interference between the fuel rail and other members can be suppressed.

  In the invention according to claim 6, the fuel rail further includes a fixing portion that is formed integrally with the protruding portion or the extending portion, or is formed integrally with both the protruding portion and the extending portion and is fixed to the internal combustion engine. . For this reason, it is possible to improve the positional accuracy of the connecting portion to which the fuel injection valve is connected by reducing the variation in assembly dimensions when manufacturing the fuel rail, and when the fuel rail is attached to the internal combustion engine, The position of the part with respect to the internal combustion engine is stabilized. As a result, the connection state between the connection portion and the fuel injection valve can be maintained well, and damage caused by fuel leakage from the connection portion or contact of the tip portion of the fuel injection valve with the internal combustion engine (cylinder head) can be prevented. Can do.

In the invention according to claim 7, the fuel injection valve is provided at the end of the housing on the side of the connecting portion, and is compressed by the housing and the connecting portion in a state where the fixing portion is fixed to the internal combustion engine. It has a clip for urging the housing toward the internal combustion engine and urging the connecting portion toward the opposite side of the extending portion in the axial direction of the internal combustion engine.
The invention according to claim 8 is characterized in that the connecting portion has a groove (27), and the detent portion (61) of the clip enters the groove (27) of the connecting portion.

  In the invention according to claim 9, the wire harness is provided so that the first connector is located on the opposite side of the protruding portion from the rail body. Therefore, even if other members such as a spark plug are provided between the plurality of holes of the internal combustion engine, the other member and the first connector interfere when the fuel injection device is attached to the internal combustion engine or after attachment. Can be suppressed.

  In the invention according to claim 10, the wire harness is provided such that the first connector is attached to the bracket. Thus, the same effect as that attained by the 9th aspect can be attained. Further, it is possible to suppress the relative position of the first connector with respect to the fuel rail from changing during operation of the internal combustion engine. Therefore, the connection state between the first connector and the end portion of the power harness can be kept good. Therefore, it is possible to stably energize the electromagnetic drive unit of the fuel injection valve.

  In addition, by attaching the first connector to the bracket, it is possible to suppress a change in the relative position of the first connector with respect to the second connector connected to the electrical connector of the fuel injection valve, such as during operation of the internal combustion engine. . Therefore, it can suppress that a stress repeatedly arises in the conducting wire which connects a 1st connector and a 2nd connector. Therefore, disconnection of a conducting wire or the like can be suppressed.

  In the invention according to claim 11, the first connector has a fitting portion that can be fitted to the bracket. Therefore, the first connector can be attached to the bracket by fitting. Therefore, it is possible to easily attach the first connector to the bracket and remove it from the bracket.

  In the invention according to claim 12, the fuel injection valve is provided such that the electrical connector is located on the rail body side or on the opposite side of the rail body with respect to the axis of the extending portion of the fuel rail. Therefore, a space having a predetermined size can be secured between the plurality of extending portions arranged in a direction parallel to the axis of the rail body. Therefore, other members such as a spark plug can be easily disposed between the plurality of extending portions.

  In a thirteenth aspect of the invention, the fuel injection valve is provided such that the electrical connector is positioned on the rail body side with respect to the axis of the extending portion of the fuel rail. Therefore, the 1st connector and the 2nd connector are arranged in the symmetrical position across the point on the axis of an extension part. Thereby, the conducting wire connecting the first connector and the second connector is deformed so as to be twisted, and is in a state of being able to contact or slide on the extending portion. However, in the present invention, the wire harness has a protective tube that is formed of an elastic material and covers the conductive wire. Therefore, the conducting tube can be protected from damage caused by contact with the extending portion or sliding by the protective tube.

  In a fourteenth aspect of the present invention, the first connector is formed in a cylindrical shape, and is provided so that the shaft is inclined with respect to the shaft of the extending portion. For example, when the first connector is provided on the side opposite to the rail body of the protruding portion of the fuel rail, the end of the first connector on the power harness side is inclined to the rail body side. Thereby, the handling of the power supply harness connected to the first connector can be facilitated.

The figure which shows the fuel-injection apparatus by one Embodiment of this invention. (A) is the figure which looked at FIG. 1 from the arrow IIA direction, (B) is the figure which looked at FIG. 1 from the arrow IIB direction. The figure which looked at FIG. 1 from the arrow III direction. It is an exploded view of a fuel injection device by one embodiment of the present invention, (A) shows a fuel rail, (B) shows a wire harness, and (C) shows a fuel injection valve. (A) is a figure which shows the state which attached the fuel-injection apparatus by one Embodiment of this invention to the internal combustion engine, (B) is the figure which looked at (A) from the arrow B direction.

Hereinafter, a fuel rail according to an embodiment of the present invention and a fuel injection device using the same will be described with reference to the drawings.
(One embodiment)
A fuel rail according to an embodiment of the present invention and a fuel injection device using the same are shown in FIGS.
As shown in FIGS. 1 to 4, the fuel injection device 10 of this embodiment includes a fuel rail 20, four fuel injection valves 50, four wire harnesses 70, and the like.

As shown in FIG. 5, the fuel rail 20 is attached to the engine 1 together with a fuel injection valve 50 for supplying fuel to the combustion chamber 2 of the engine 1 as an internal combustion engine, and the fuel from the fuel supply source 11 is supplied to the fuel injection valve. Distribute to 50.
Hereinafter, for the sake of convenience, the vertical direction in FIG. 5A is the vertical direction of the engine 1 (vertical vertical direction), the vertical direction in FIG. 5B is the horizontal direction of the engine 1, and The left-right direction will be described as the front-rear direction of the engine 1.

  The fuel injection valve 50 is an electromagnetically driven direct injection type fuel injection valve that directly injects high-pressure fuel into the combustion chamber 2 of the engine 1. The engine 1 to which the fuel injection valve 50 is attached is a four-cylinder gasoline engine that uses gasoline as fuel. Therefore, the engine 1 has four combustion chambers 2. The cylinder head 3 of the engine 1 has four holes 4 corresponding to the four combustion chambers 2. The fuel injection valve 50 is attached to the engine 1 so as to be accommodated in the hole 4. The hole 4 is formed to be relatively long so as to extend in the axial direction of the combustion chamber 2, that is, in the vertical direction of the engine 1 (cylinder head 3). That is, the hole 4 is formed so as to connect the outside above the engine 1 and the combustion chamber 2.

  Further, the depth of the hole 4 is formed deeper than the entire length of the fuel injection valve 50. Therefore, when the fuel injection valve 50 is attached to the hole 4, the entire fuel injection valve 50 is accommodated in the hole 4. The fuel injection valve 50 injects fuel from the upper side in the vertical direction of the combustion chamber 2 toward the inside of the combustion chamber 2. That is, the engine 1 is a center injection type engine.

  As shown in FIG. 5, the holes 4 are formed to be aligned in the front-rear direction of the engine 1. The cylinder head 3 is formed with three inclined holes 5 between the holes 4 and one oblique hole 5 in the vicinity of the hole 4. The oblique hole 5 is formed so as to connect the outside above the engine 1 and the combustion chamber 2 and to be inclined with respect to the hole 4. A spark plug 6 is accommodated in the oblique hole 5. When the spark plug 6 is housed in the oblique hole 5, one end portion (ignition portion) is exposed to the combustion chamber 2, and the other end portion is exposed to the space above the cylinder head 3.

As shown in FIGS. 1-4, the fuel rail 20 is provided with the rail main body 21, the protrusion part 24, the extending | stretching part 25, the connection part 28 grade | etc.,.
The rail main body 21 is formed in a hollow cylindrical shape by metal, for example. Both ends of the rail body 21 are closed. A cylindrical fuel pipe connection portion 22 is formed on the outer wall of one end portion of the rail body 21. An inflow port 23 that connects the inner wall and the outer wall of the rail body 21 is formed inside the fuel pipe connection portion 22. A fuel pipe 12 extending from the fuel supply source 11 is connected to the fuel pipe connecting portion 22 (see FIG. 5A). As a result, the fuel from the fuel supply source 11 flows into the rail body 21 via the fuel pipe 12, the fuel pipe connection portion 22, and the inflow port 23.

  A plurality of projecting portions 24 are formed from the rail body 21 in a cylindrical shape in a direction substantially perpendicular to the axis Ax1 of the rail body 21 and at a predetermined interval in the direction of the axis Ax1 of the rail body 21. . In the present embodiment, four protrusions 24 are formed. In addition, a hole for connecting the inner wall and the outer wall of the rail body 21 is formed inside the protruding portion 24, and the inside of the protruding portion 24 and the inside of the rail body 21 communicate with each other.

The extending portion 25 is formed so as to extend in a cylindrical shape from the end of the protruding portion 24 opposite to the rail main body 21 in a direction substantially perpendicular to both the axis Ax2 of the protruding portion 24 and the axis Ax1 of the rail main body 21. ing. Here, the inside of the extending portion 25 communicates with the inside of the protruding portion 24.
The connecting portion 28 is formed at the end of the extending portion 25 opposite to the protruding portion 24.

In the present embodiment, the pressure detector 13 is provided on the rail body 21. The pressure detector 13 has a pressure sensor (not shown) exposed in the internal space of the rail body 21. Thereby, the pressure detector 13 can detect the pressure inside the rail body 21. An electrical signal related to the pressure inside the rail body 21 detected by the pressure sensor is transmitted to an electronic control unit (hereinafter referred to as “ECU”) 15 via the connector 14.
The ECU 15 is a small computer having a CPU, a ROM, a RAM, and the like, and integrates the vehicle by controlling various devices and devices mounted on the vehicle based on signals from various sensors attached to the vehicle. Control.

As shown in FIG. 4C, the fuel injection valve 50 includes a housing 51, a valve member 53, an electromagnetic drive unit 54, an electrical connector 55, and the like.
The housing 51 is formed in a bottomed cylindrical shape with, for example, metal. A nozzle hole 52 is formed at the bottom of the housing 51. An end portion of the housing 51 opposite to the injection hole 52 forms a fuel introduction portion. The fuel is introduced into the housing 51 via the fuel introduction part. The valve member 53 is formed in a rod shape and is provided inside the housing 51. The valve member 53 can open and close the nozzle hole 52 by reciprocating in the housing 51. The electromagnetic drive unit 54 includes a mover, a stator, and a coil (not shown). The mover is provided integrally with the valve member 53 at the end of the valve member 53 opposite to the nozzle hole 52. The stator is provided inside the housing 51 on the side opposite to the valve member 53 of the mover. The coil is provided outside the diameter of the mover and the stator. Further, an urging member is provided between the stator and the mover, and the mover and the valve member 53 are urged toward the injection hole 52 side.

  The electrical connector 55 is formed in a cylindrical shape from resin and has a terminal inside. The terminal is electrically connected to the coil of the electromagnetic drive unit 54. When electric power is supplied to the coil via the terminal of the electrical connector 55, a magnetic field is generated around the coil. Thereby, a magnetic circuit is formed in the mover and the stator, and a magnetic attractive force is generated between the stator and the mover. Therefore, the mover is sucked together with the valve member 53 to the stator side. As a result, the valve member 53 is opened. On the other hand, when the power supply to the coil is cut off, the magnetic attractive force between the stator and the mover disappears, and the mover and the valve member 53 are attached to the nozzle hole 52 side by the urging force of the urging member. Moved with force. As a result, the valve member 53 is closed. Thus, by controlling the electric power supplied to the electromagnetic drive unit 54, the drive of the valve member 53 can be controlled.

As shown in FIG. 4B, the wire harness 70 includes a first connector 71, a second connector 75, a conductive wire 76, and the like.
The first connector 71 is formed in a cylindrical shape from resin and has a terminal inside. The second connector 75 is formed in a cylindrical shape from resin and has a terminal inside. The conducting wire 76 electrically connects the terminal of the first connector 71 and the terminal of the second connector 75.

  The wire harness 70 includes a protective tube 77 that is formed of an elastic material and covers the conductive wire 76. Further, the first connector 71 has a fitting portion 72. A first pin 73 and a second pin 74 are formed in the fitting portion 72.

  As shown in FIGS. 1 and 3, the fuel injection valve 50 is configured such that the end portion of the housing 51 opposite to the injection hole 52, that is, the fuel introduction portion is inserted inside the connection portion 28 of the fuel rail 20. Connected to the connection unit 28. A seal member 56 is provided on the outer wall of the end portion of the housing 51 opposite to the nozzle hole 52. As a result, the space between the outer wall of the housing 51 and the inner wall of the connection portion 28 is kept liquid-tight.

  Further, the connecting portion 28 is formed with a flange portion 26 that extends annularly from the outer wall in the radially outward direction. Further, the fuel injection valve 50 has a clip 60 provided at the end of the housing 51 opposite to the injection hole 52. The clip 60 is made of, for example, metal, and has a rotation preventing portion 61 and an elastic deformation portion 62.

  When the fuel injection valve 50 is connected to the connection portion 28, the rotation preventing portion 61 of the clip 60 enters the groove portion 27 formed in the flange portion 26. As a result, the fuel injection valve 50 is restricted from rotating around the shaft in a state where it is connected to the connection portion 28. In the state where the fuel injection valve 50 is connected to the connection portion 28, the electrical connector 55 is located on the rail body 21 side with respect to the axis Ax3 of the extending portion 25.

  The wire harness 70 is connected to the electrical connector 55 such that the second connector 75 is inserted inside the electrical connector 55 of the fuel injection valve 50. Thereby, the terminal of the 2nd connector 75 and the terminal of the electrical connector 55 are electrically connected.

  The fuel rail 20 further includes a bracket 30 provided on the opposite side of the protrusion 24 from the rail body 21. The bracket 30 is fixed to the opposite side of the protrusion 24 to the rail body 21. The bracket 30 has a plate-like attachment portion 31 perpendicular to the axis Ax1 of the rail body 21. The attachment portion 31 is formed with a first hole 32 and a second hole 33 that penetrate the attachment portion 31 in the plate thickness direction. As shown in FIG. 3, the first hole 32 is formed at a position closer to the axis Ax3 of the extending portion 25 than the second hole 33.

  The first connector 71 of the wire harness 70 is configured so that the first pin 73 of the fitting portion 72 is fitted into the first hole 32 of the bracket 30 and the second pin 74 is inserted into the second hole 33. The bracket 30 is attached. Here, on the outer wall of the first pin 73, a plurality of annular protrusions having an inclined surface on the tip side of the first pin 73 are formed. Therefore, the first pin 73 can be easily fitted into the first hole 32, while being prevented from coming out of the first hole 32.

  In the state where the first connector 71 is attached to the bracket 30, the end opposite to the second connector 75 is inclined toward the rail body 21. That is, the first connector 71 is provided such that the axis Ax4 is inclined with respect to the axis Ax3 of the extending portion 25 (see FIG. 3). The connector 14 of the pressure detection unit 13 is also provided so that the axis is inclined with respect to the axis Ax3 of the extending part 25.

  As shown in FIGS. 1-3, the fuel rail 20 is further provided with the fixing | fixed part 40 provided in the edge part by the side of the extending | stretching part 25 of the protrusion part 24. As shown in FIG. The fixed portion 40 is formed integrally with the protruding portion 24 so as to protrude from the end portion of the protruding portion 24 on the extending portion 25 side in a direction parallel to the axis Ax1 of the rail body 21. The fixing portion 40 is formed with a bolt hole 41 penetrating the fixing portion 40 in a direction parallel to the axis Ax3 of the extending portion 25.

  As shown in FIG. 5, the fixing portion 40 is fixed to the cylinder head 3 by inserting the bolt 7 through the bolt hole 41 and screwing it into the cylinder head 3. Thereby, the fuel injection device 10 including the fuel rail 20 is attached to the cylinder head 3. In a state where the fuel injection device 10 is attached to the cylinder head 3, a downward force in the vertical direction acts on the elastic deformation portion 62 of the clip 60 of the fuel injection valve 50 from the flange portion 26 of the extending portion 25. Therefore, the housing 51 of the fuel injection valve 50 is pressed against the step surface of the hole 4. Thereby, the position in the hole 4 of the fuel injection valve 50 is stabilized.

  In the present embodiment, since the extending portion 25 and the rail body 21 are connected by the protruding portion 24, the rail body 21 is in a state where the fuel rail 20 (fuel injection device 10) is attached to the cylinder head 3. The end surface of the cylinder head 3 (the upper end surface of the cylinder head 3) where the end of the hole 4 opposite to the combustion chamber 2 opens is offset from the hole 4 by the length of the protrusion 24 in the surface direction. It will be arranged at the position. Therefore, a space S having a predetermined size can be secured between the plurality of protrusions 24. Therefore, in this embodiment, the fuel rail 20 and the spark plug 6 do not interfere with each other above the end surface.

  The first connector 71 of the wire harness 70 is connected to the end of the power harness 17 that is connected to the power source 16. The ECU 15 is provided between the power supply 16 and the power supply harness 17 and controls electric power supplied from the power supply 16 to the fuel injection valve 50 via the power supply harness 17. Thereby, the ECU 15 can control fuel injection from the fuel injection valve 50.

  The ECU 15 is connected to the spark plug 6 by a power harness different from the power harness 17 and controls electric power supplied to the spark plug 6. Thereby, the ECU 15 can control the ignition of fuel by the spark plug 6. In FIG. 5A, the illustration of the power harness that connects the ECU 15 and the spark plug 6 is omitted in order to avoid the drawing becoming complicated.

Next, the operation of the fuel injection device 10 and other devices will be described.
First, when fuel is discharged from the fuel supply source 11, the fuel flows into the rail body 21 through the fuel pipe 12 and the inflow port 23. The fuel that has flowed into the inside of the rail body 21 is distributed to each of the four fuel injection valves 50 via the insides of the plurality of projecting portions 24 and the extending portions 25, and the inside of the housing 51 from the fuel introduction portion of the fuel injection valves 50. To be introduced. As a result, the interior of the housing 51 is filled with fuel.

When the ECU 15 supplies electric power to the electromagnetic drive unit 54 of the fuel injection valve 50 in a state where the interior of the housing 51 is filled with fuel, the valve member 53 is opened and the fuel is injected from the injection hole 52 into the combustion chamber 2. The Thereafter, when the ECU 15 stops supplying electric power to the electromagnetic drive unit 54, the valve member 53 is closed, and fuel injection from the injection hole 52 is stopped.
Here, when the ECU 15 supplies electric power to the spark plug 6, a spark is generated in the ignition part of the spark plug 6, and the fuel is ignited.
By repeating the fuel injection from the fuel injection valve 50 and the ignition of the fuel by the spark plug 6, the operation of the engine 1 is continued.

  As described above, in the present embodiment, it is assumed that the fuel rail 20 is attached to the engine 1 so as to be connected to the plurality of fuel injection valves 50 provided at the center of the upper end of the combustion chamber 2 of the engine 1. Yes. That is, the engine 1 to which the fuel rail 20 of this embodiment is attached is a center injection type internal combustion engine. Therefore, the hole 4 in which the fuel injection valve 50 is accommodated is formed relatively deep. In this embodiment, since the fuel rail 20 includes the extending portion 25, the fuel inside the rail body 21 is provided at a deep position of the hole 4 of the engine 1 via the extending portion 25, that is, in the vicinity of the combustion chamber 2. The fuel injection valve 50 can be distributed.

  In the present embodiment, since the extending portion 25 and the rail body 21 are connected by the protruding portion 24, the rail body 21 has the combustion chamber in the hole 4 when the fuel rail 20 is attached to the engine 1. In the end surface of the cylinder head 3 where the end opposite to 2 is open, the cylinder head 3 is disposed at a position offset from the hole 4 by the length of the protrusion 24 in the surface direction. Therefore, a space S having a predetermined size can be secured between the plurality of protrusions 24. Therefore, even if other members such as the spark plug 6 are provided between the plurality of holes 4 formed so as to be aligned in the front-rear direction of the engine 1, the interference between the other members and the rail body 21 is suppressed. be able to. Further, by suppressing the interference between the fuel rail 20 and other members, it is possible to prevent the fuel rail 20 from partially protruding from the cylinder head 3 of the engine 1.

  In the engine 1 to which the fuel rail 20 of the present embodiment is attached, the spark plug 6 and the like can be disposed between the plurality of holes 4 arranged in the front-rear direction. The physique in the direction perpendicular to the arrangement direction can be reduced.

  Further, the fuel injection device 10 of the present embodiment includes a fuel rail 20, a fuel injection valve 50, and a wire harness 70. The fuel injection valve 50 includes a housing 51 in which an injection hole 52 is formed, a valve member 53 that can open and close the injection hole 52 by reciprocating in the housing 51, an electromagnetic drive unit 54 that drives the valve member 53, and The electric connector 55 is connected to the electromagnetic drive unit 54, the end of the housing 51 opposite to the injection hole 52 is connected to the connection unit 28 of the fuel rail 20, and is accommodated in the hole 4 of the engine 1. Is done. The wire harness 70 includes a first connector 71 to which an end of the power harness 17 connected to the power source 16 is connected, a second connector 75 to be connected to an electrical connector of the fuel injection valve 50, and the first connector 71 and the second connector 71. A conductive wire 76 is connected to the connector 75. The fuel injection device 10 uses the fuel rail 20 described above. Accordingly, interference between the fuel rail 20 and other members can be suppressed.

  Moreover, in this embodiment, the wire harness 70 is provided so that the 1st connector 71 may be located in the opposite side to the rail main body 21 of the protrusion part 24. FIG. Therefore, even if other members such as a spark plug 6 are provided between the plurality of holes 4 of the engine 1, when the fuel injection device 10 is attached to the engine 1 or after attachment, the other members and the first connector are attached. It can suppress that 71 interferes.

  Moreover, in this embodiment, the bracket 30 provided further on the opposite side to the rail main body 21 of the protrusion part 24 of the fuel rail 20 is further provided. In the present embodiment, the wire harness 70 is provided such that the first connector 71 is attached to the bracket 30. Thereby, it is possible to prevent the relative position of the first connector 71 with respect to the fuel rail 20 from changing during operation of the engine 1 or the like. Therefore, the connection state between the first connector 71 and the end of the power supply harness 17 can be kept good. Therefore, it is possible to stably energize the electromagnetic drive unit 54 of the fuel injection valve 50.

  Further, when the first connector 71 is attached to the bracket 30, the relative position of the first connector 71 with respect to the second connector 75 connected to the electrical connector 55 of the fuel injection valve 50 is changed, for example, when the engine 1 is operating. Can be suppressed. Therefore, it is possible to suppress the occurrence of repeated stress in the conducting wire 76 that connects the first connector 71 and the second connector 75. Therefore, disconnection of the conducting wire 76 can be suppressed.

  In the present embodiment, the first connector 71 includes a fitting portion 72 that can be fitted to the bracket 30. Therefore, the first connector 71 can be attached to the bracket 30 by fitting. Therefore, the attachment of the first connector 71 to the bracket 30 and the removal from the bracket 30 can be easily performed.

  In the present embodiment, the fuel injection valve 50 is provided so that the electrical connector 55 is positioned on the rail body 21 side with respect to the axis Ax3 of the extending portion 25 of the fuel rail 20. Therefore, a space of a predetermined size can be secured between the plurality of extending portions 25 arranged in a direction parallel to the axis Ax1 of the rail body 21. Therefore, other members such as the spark plug 6 can be easily disposed between the plurality of extending portions 25.

  Further, in the present embodiment, the wire harness 70 is provided so that the first connector 71 is positioned on the opposite side of the protruding body 24 from the rail body 21, and the fuel injection valve 50 has the electric connector 55 extending from the fuel rail 20. It is provided so as to be positioned on the rail body 21 side with respect to the axis Ax3 of the portion 25. Therefore, the first connector 71 and the second connector 75 are arranged at symmetrical positions with respect to the point on the axis of the extending portion 25. Thereby, the conducting wire 76 connecting the first connector 71 and the second connector 75 is deformed so as to be twisted, and is in a state of being able to contact or slide on the extending portion 25. However, in this embodiment, the wire harness 70 includes a protective tube 77 that is formed of an elastic material and covers the conductive wire 76. Therefore, the conducting wire 76 can be protected by the protective tube 77 from damage due to contact with the extending portion 25 or sliding.

  In the present embodiment, the first connector 71 is formed in a cylindrical shape, and is provided such that the axis Ax4 is inclined with respect to the axis Ax3 of the extending portion 25. In the present embodiment, since the first connector 71 is provided on the opposite side of the protruding portion 24 of the fuel rail 20 from the rail body 21, the end portion of the first connector 71 on the power harness 17 side is on the rail body 21 side. It will be tilted. Thereby, handling of the power supply harness 17 connected to the 1st connector 71 can be made easy.

  In the present embodiment, a fixing portion 40 that is formed integrally with the protruding portion 24 and is fixed to the engine 1 is further provided. Therefore, in a state where the fuel rail 20 is attached to the engine 1, the position of the extending portion 25 with respect to the engine 1 is stabilized. Thereby, the connection state of the connection part 28 and the fuel injection valve 50 can be kept favorable, and the damage by the fuel leakage from the connection part 28 and the contact with the engine 1 (cylinder head 3) at the tip of the fuel injection valve 50 is prevented. Can be prevented.

(Other embodiments)
In other embodiment of this invention, the wire harness may be provided so that a 1st connector may be located in positions other than the rail body of a protrusion part on the opposite side.

In another embodiment of the present invention, the fuel rail may not include a bracket. In this case, the first connector of the wire harness may not be fixed.
Moreover, in other embodiment of this invention, the 1st connector does not need to have the fitting part which can be fitted to a bracket.

Moreover, in other embodiment of this invention, the fuel injection valve may be provided so that an electrical connector may be located in the opposite side to a rail main body with respect to the axis | shaft of an extending | stretching part. The fuel injection valve may be provided so that the electrical connector is located at a position other than the rail body side or the opposite side of the rail body with respect to the axis of the extending portion. Moreover, the wire harness does not need to have the protective tube formed with the material which has elasticity.
Moreover, in other embodiment of this invention, the 1st connector may be provided so that an axis | shaft may become parallel with respect to the axis | shaft of an extending | stretching part.

In another embodiment of the present invention, the fixed portion fixed to the internal combustion engine may be formed integrally with the extending portion. Or the fixing | fixed part may be integrally formed with both the protrusion part and the extending | stretching part. Moreover, the fixing | fixed part may be formed in any location of the site | part which comprises a fuel rail.
Moreover, in other embodiment of this invention, the pressure detection part does not need to be provided in the fuel rail. The fuel injection valve may not have a clip.

  Further, in another embodiment of the present invention, the extending portion is not limited to a strict cylindrical shape in which the shaft is linear, but may be formed in a cylindrical shape in which the shaft is curved or bent. That is, the shape of the extending portion may be changed in accordance with the shape of the hole of the internal combustion engine in which the fuel injection valve is accommodated.

  In another embodiment of the present invention, the fuel rail may include two, three, five, or more, without being limited to four protrusions, extending portions, and connection portions. That is, the number of projecting portions, extending portions, and connecting portions may be increased or decreased in accordance with the number of combustion chambers or the number of fuel injection valves of the internal combustion engine to be attached.

The fuel rail and the fuel injection device of the present invention are not limited to the center injection type internal combustion engine, and may be attached to a side injection type internal combustion engine.
Further, the fuel rail and the fuel injection device of the present invention can be applied not only to a gasoline engine but also to a diesel engine.
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.

1 ・ ・ ・ ・ ・ Engine (internal combustion engine)
2 ... Combustion chamber 4 ... Hole 11 ... Fuel supply source 20 ... Fuel rail 21 ... Rail body 23 ... Inlet 24 ... Projection part 25 ... Extension part 28 ... Connection part 50 ... Fuel injection valve Ax1 ... Rail body axis Ax2 ... Projection part axis

Claims (14)

A fuel rail attached to the internal combustion engine together with a plurality of fuel injection valves for injecting and supplying fuel to a combustion chamber of the internal combustion engine, and distributing fuel from a fuel supply source to the fuel injection valves;
A cylindrical rail body having an inlet into which fuel from the fuel supply flows;
A plurality of protrusions formed at predetermined intervals in the axial direction of the rail body;
An extending portion that is formed so as to extend in a direction substantially perpendicular to the axis of the rail body from the protruding portion, and is inserted into a hole portion that connects the outside of the internal combustion engine and the combustion chamber;
A connecting portion that is formed on the opposite side of the projecting portion of the extending portion and to which one end of the fuel injection valve accommodated in the hole portion is connected;
A bracket provided on the projecting portion and capable of attaching a wire harness for supplying electric power to the fuel injection valve;
A fuel rail comprising:   2. The fuel rail according to claim 1, wherein the bracket is provided on a side of the protruding portion opposite to the rail body.   The fuel rail according to claim 1 or 2, wherein the connecting portion has a groove (27).   The fuel rail according to any one of claims 1 to 3, wherein the extending portion is longer than a distance between the adjacent protruding portion and the protruding portion among the plurality of protruding portions. The fuel rail according to any one of claims 1 to 4,
A housing in which an injection hole is formed, a valve member capable of opening and closing the injection hole by reciprocating in the housing, an electromagnetic drive unit that drives the valve member, and an electrical connector connected to the electromagnetic drive unit An end of the housing opposite to the injection hole is connected to the connection portion, and the fuel injection valve is accommodated in the hole portion;
A first connector to which an end portion of a power harness connected to a power source is connected; a second connector connected to the electrical connector; and a wire harness having a conductive wire connecting the first connector and the second connector;
A fuel injection device comprising:   The fuel rail further includes a fixing portion that is formed integrally with the protruding portion or the extending portion, or is formed integrally with both the protruding portion and the extending portion, and is fixed to the internal combustion engine. The fuel injection device according to claim 5. The fuel injection valve is
The housing is attached to the internal combustion engine side by being compressed by the housing and the connection portion in a state in which the fixing portion is fixed to the internal combustion engine. The fuel injection device according to claim 6, further comprising a clip that urges the connecting portion toward a side opposite to the internal combustion engine in the axial direction of the extending portion. The connecting part has a groove (27);
The fuel injection device according to claim 7, wherein the rotation preventing portion (61) of the clip is inserted into the groove (27) of the connecting portion.   The fuel injection device according to any one of claims 5 to 8, wherein the wire harness is provided so that the first connector is located on a side opposite to the rail body of the protruding portion. .   The fuel injection device according to any one of claims 5 to 9, wherein the wire harness is provided so that the first connector is attached to the bracket.   The fuel injection device according to any one of claims 5 to 10, wherein the first connector includes a fitting portion that can be fitted to the bracket.   The fuel injection valve is provided so that the electrical connector is located on the rail main body side or the opposite side to the rail main body with respect to the axis of the extending portion. The fuel injection device according to one item. The fuel injection valve is provided such that the electrical connector is positioned on the rail body side with respect to the axis of the extending portion,
The fuel injection device according to any one of claims 5 to 11, wherein the wire harness includes a protective tube that is formed of an elastic material and covers the conductive wire.   The fuel injection device according to any one of claims 5 to 13, wherein the first connector is formed in a cylindrical shape, and is provided such that a shaft is inclined with respect to a shaft of the extending portion.

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