JP2017137774A - Fuel supply system for internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuel supply system for an internal combustion engine capable of protecting a fuel rail without increasing the weight.SOLUTION: A fuel supply system 100 includes: a plurality of injector holders 120 for holding a plurality of injectors 103, respectively, each of which directly injects fuel to a combustion chamber of an internal combustion engine body; and a cylindrical fuel rail 110 extended in the cylinder row direction of a plurality of cylinders and distributing fuel to the injectors 103 via the injector holders 120. Injector communication holes 111 for supplying fuel to the injectors 103 via the injector holders 120 are formed in the fuel rail 110, and each of the injector holder 120 includes an injector annular portion 123 having an annular shape surrounding an outer peripheral surface of the fuel rail 110 at a portion in which the injector communication hole 111 is located.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a fuel supply device for an internal combustion engine, and more particularly to a fuel supply device for a direct injection internal combustion engine.

  In vehicles such as automobiles, a direct injection internal combustion engine in which fuel is directly injected into a cylinder by an injector is known. A fuel supply device for an inline-type direct injection internal combustion engine in which a plurality of cylinders are arranged in a row extends in the cylinder row direction of the internal combustion engine and is supplied with high-pressure fuel, and high-pressure fuel is supplied from the fuel rail to the injector. A fuel distribution portion for distribution and a fastening boss portion for attaching a fuel rail to the internal combustion engine main body such as a cylinder head are provided. The fuel supply device configured in this manner distributes and supplies high-pressure fuel pumped from the fuel pump to the fuel rail to the injectors through the fuel distributor.

  As a conventional fuel supply apparatus of this type, one described in Patent Document 1 is known. In the fuel supply device described in Patent Document 1, the fuel distribution unit includes a fuel passage unit having a distribution channel for distributing and supplying high-pressure fuel to the injector, and a cup unit in which the injector is accommodated. In this fuel supply device, the fuel passage portion is joined to the fuel rail, and the cup portion is formed integrally with the fuel passage portion on the opposite side of the fuel passage portion from the fuel rail, and the fastening boss portion Is provided in the vicinity of the cup portion and formed integrally with the fuel distribution portion.

  As a result, this fuel supply device can suppress the occurrence of fuel leakage when the high-pressure fuel pipe is attached to the engine, and can also prevent the torsion and bending moment from acting on the fuel rail. it can.

JP 2011-226425 A

  However, in a conventional fuel supply device for an internal combustion engine, a high fuel pressure acts in the direction of expanding the diameter of the fuel rail. There was a risk that the stress would concentrate and the life of the fuel rail would be reduced. On the other hand, increasing the thickness of the fuel rail can increase the strength of the fuel rail, but in this case, the weight increases.

  Further, in the conventional fuel supply device for an internal combustion engine, the fuel rail disposed around the internal combustion engine body is provided between the vehicle body side parts such as a dash panel and the internal combustion engine body when the vehicle receives an external force. There is a risk of strong interference with the vehicle body side component or the internal combustion engine body.

  The present invention has been made paying attention to the above-described problems, and an object of the present invention is to provide a fuel supply device for an internal combustion engine that can protect the fuel rail without increasing the weight.

  The present invention provides a plurality of injector holders each holding a plurality of injectors that directly inject fuel into a combustion chamber of an internal combustion engine body, extending along a cylinder row direction of a plurality of cylinders, and through the injector holder In a fuel supply device for an internal combustion engine having a cylindrical fuel rail that distributes fuel to the injector, an injector communication hole that supplies fuel to the injector through the injector holder is formed in the fuel rail, The injector holder is provided with an annular injector annular portion that surrounds the outer peripheral surface of the fuel rail at a position where the injector communication hole is located.

  According to the present invention, since the fuel rail at the portion where the injector communication hole is located is surrounded by the injector annular portion of the injector holder, the fuel rail can be reinforced by the injector annular portion, and the injector communication hole of the fuel rail can be reinforced. The rigidity of surrounding parts can be increased. Thereby, it is possible to prevent local stress from being concentrated around the injector communication hole by the high-pressure fuel, and the life of the fuel rail can be extended.

  In addition, the outer peripheral surface of the injector annular portion can protrude outward in the radial direction of the fuel rail from the outer peripheral surface of the fuel rail. As a result, when the external force acts on the vehicle and the internal combustion engine body or the vehicle body part moves to the fuel rail side, the internal combustion engine body or the vehicle body part comes into contact with the injector annular portion. For this reason, it can prevent that an internal combustion engine main body or a vehicle body component interferes with a fuel rail directly, and can protect a fuel rail. For this reason, it is not necessary to increase the plate thickness of the fuel rail in consideration of interference with the vehicle body parts when an external force is applied to the vehicle, so that the weight of the fuel rail can be reduced. As a result, the fuel rail 110 can be protected without increasing the weight.

FIG. 1 is a diagram showing an embodiment of a fuel supply device for an internal combustion engine according to the present invention, and is a side view of a front portion of a vehicle. FIG. 2 is a view showing an embodiment of a fuel supply device for an internal combustion engine according to the present invention, and is a rear view of the internal combustion engine. FIG. 3 is a view showing an embodiment of the fuel supply device for an internal combustion engine of the present invention, and is a rear view of the fuel supply device. FIG. 4 is a diagram showing an embodiment of a fuel supply device for an internal combustion engine according to the present invention, and is a front view of the fuel supply device. FIG. 5 is a view showing an embodiment of the fuel supply device for an internal combustion engine of the present invention, and is a cross-sectional view taken along the VV direction of the fuel supply device of FIG. 6 is a view showing an embodiment of the fuel supply device for an internal combustion engine of the present invention, and is a cross-sectional view taken along the line VI-VI of the fuel supply device of FIG. FIG. 7 is a view showing an embodiment of the fuel supply device for an internal combustion engine of the present invention, and is a side view of the front portion of the vehicle when deformed by receiving a force from the front.

  DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment of a fuel supply device for an internal combustion engine according to the present invention will be described with reference to the drawings. FIGS. 1-7 is a figure which shows the fuel supply apparatus of the internal combustion engine of one Embodiment which concerns on this invention. First, the configuration will be described. 1 to 7, the left and right front-rear direction represents the left and right front-rear direction of the vehicle as viewed from the driver's seat.

  1 and 2, a vehicle 1 such as an automobile includes a vehicle body 2, and the vehicle body 2 includes an engine room 4 on the front side of the vehicle 1 and a vehicle room 5 on the rear side of the vehicle 1 by a dash panel 3. Partitioned.

  An engine hood 2 </ b> A is provided above the engine room 4, and the engine hood 2 </ b> A covers the engine room 4. A front portion of the dash panel 3 in the vehicle 1 constitutes a front portion of the vehicle 1.

  The engine room 4 is provided with an internal combustion engine 10, and the internal combustion engine 10 includes an internal combustion engine body 6 and auxiliary equipment such as a fuel supply device 100.

  The internal combustion engine body 6 includes a cylinder block 7, a cylinder head 8 provided on the upper part of the cylinder block 7, and a head cover 9 provided on the upper part of the cylinder head 8. An oil pan (not shown) is provided below the cylinder block 7.

  The cylinder block 7 houses a piston (not shown) accommodated in a cylinder (not shown) so as to be movable up and down, a crankshaft (not shown) that converts the vertical movement of the piston into a rotational motion, and the like. The crankshaft extends in the cylinder row direction indicated by arrow A (the width direction of the vehicle 1).

  An intake manifold 14 having a surge tank 12 and an intake branch pipe 13 is provided at the rear portion of the cylinder head 8. The intake manifold 14 is connected to a cylinder head 8 that is the internal combustion engine body 6, and introduces air into a combustion chamber 11 formed in the cylinder head 8. The surge tank 12 temporarily stores air introduced from an air cleaner (not shown). The surge tank 12 is connected to the intake branch pipe 13 and introduces air into the intake branch pipe 13. The intake branch pipe 13 extends from the surge tank 12 toward the front of the vehicle and has a substantially horizontal shape in a side view of the vehicle. An intake manifold 14 having an intake branch pipe 13 and a surge tank 12 constitutes an auxiliary machine of the internal combustion engine 10.

  1, 2, 3, 4, and 5, the fuel supply apparatus 100 includes a high-pressure fuel pump 101, a fuel supply pipe 102, a fuel rail 110, an injector holder 120, an injector 103, and the like. .

  The high-pressure fuel pump 101 is provided at the rear portion of the upper surface of the head cover 9, and boosts the fuel by using the rotation of a camshaft (not shown) disposed inside the cylinder head 8 as power.

  The fuel rail 110 is connected to the high-pressure fuel pump 101 via the fuel supply pipe 102. The fuel rail 110 is disposed below the intake branch pipe 13 and is disposed between the surge tank 12 and the internal combustion engine body 6. Further, the fuel rail 110, the injector holder 120, and the injector 103 are sandwiched between the surge tank 12 and the internal combustion engine body 6 and are in a space surrounded by the surge tank 12, the intake branch pipe 13, and the internal combustion engine body 6. Is arranged.

  The fuel rail 110 extends along the cylinder row direction of a plurality of cylinders and distributes fuel to the injector 103 via the injector holder 120. The fuel rail 110 is formed of a cylindrical pipe member.

  A plug 150 is provided at one end (right end) of the fuel rail 110, and the plug 150 closes one end of the fuel rail 110. A pipe joint 130 is provided at the other end (left end) of the fuel rail 110, and a fuel supply pipe 102 is connected to the pipe joint 130.

  The injector 103 directly injects fuel into the combustion chamber 11 of the internal combustion engine body 6. The internal combustion engine 10 according to the present embodiment is a three-cylinder engine having three cylinders, and includes three injectors 103. The internal combustion engine 10 is a direct injection internal combustion engine.

  Three injector holders 120 are provided on the fuel rail 110, and hold the three injectors 103, respectively. The injector holder 120 holds the injector 103 by an injector connecting portion 121 described later, and fixes the fuel rail 110 to the internal combustion engine body 6 by a fastening boss 122 described later. That is, the injector holder 120 has a function of holding the injector 103 and a function of fixing the fuel rail 110 to the internal combustion engine body 6.

  The fuel rail 110 is formed with an injector communication hole 111 that supplies fuel to the injector 103 via the injector holder 120.

  The injector holder 120 is provided with an annular injector annular portion 123 that surrounds the outer peripheral surface of the fuel rail 110 where the injector communication hole 111 is located. The injector holder 120 is fixed to the fuel rail 110 by brazing in a state where the fuel rail 110 is inserted through the injector annular portion 123.

  The injector holder 120 has a fastening boss 122 that is fastened to the internal combustion engine body 6 integrally with the injector holder 120. The fastening boss 122 is disposed in the vicinity of the injector communication hole 111. The fastening boss 122 is provided with a bolt insertion hole 122 </ b> A, and the injector holder 120 is fixed to the internal combustion engine body 6 by inserting the bolt 122 </ b> B into the bolt insertion hole 122 </ b> A and fastening to the internal combustion engine body 6.

  The fuel rail 110 is provided with a fuel pressure sensor boss 140 for fixing the fuel pressure sensor 104 for detecting the fuel pressure in the fuel rail 110. The fuel pressure sensor boss 140 is disposed between two injector holders 120 adjacent to each other in the cylinder row direction. The fuel pressure sensor boss 140 has a fuel pressure sensor annular portion 143 surrounding the outer peripheral surface of the fuel rail 110. The fuel pressure sensor boss 140 is fixed to the fuel rail 110 by brazing in a state where the fuel rail 110 is inserted through the fuel pressure sensor annular portion 143.

  3, 4, and 5, the injector holder 120 is integrally provided with an injector connecting portion 121. The injector connecting portion 121 is formed with an injector connecting hole 121A to which the injector 103 is connected, and a fuel passage 121B that communicates with the injector connecting hole 121A. The injector connection hole 121A opens to the internal combustion engine body 6 side. The injector connection hole 121A and the fuel passage 121B are circular cross-sectional holes arranged coaxially with each other, and are formed by cutting or the like.

  A fuel passage 123B is formed in the injector annular portion 123. The fuel passage 123B opens to the inner peripheral surface of the injector annular portion 123 and communicates with the fuel passage 121B at a right angle. The fuel passage 123B is arranged coaxially with the injector communication hole 111 of the fuel rail 110 and communicates with the injector communication hole 111.

  A brazing surface 123 </ b> C that is integrally joined to the outer peripheral surface of the fuel rail 110 is formed on the inner peripheral surface of the injector annular portion 123. The brazing surface 123 </ b> C is formed so as to contact the outer peripheral surface of the fuel rail 110 with substantially no gap.

  Between the brazing surface 123C of the injector annular portion 123 and the outer peripheral surface of the fuel rail 110, a brazing layer 161 made of copper braze or the like is provided, and the brazing layer 161 and the injector annular portion 123 are connected to the fuel. The rail 110 is integrally and liquid-tightly joined.

  The injector annular portion 123 has an injector through-hole 123 </ b> A that penetrates from the brazing surface 123 </ b> C to the outer peripheral surface of the injector annular portion 123. The injector through hole 123A faces the fuel passage 123B across the central axis of the fuel rail 110. In other words, the injector through-hole 123A is disposed at a position 180 degrees away from the fuel passage 123B in the circumferential direction of the fuel rail 110.

  Thus, the injector holder 120 is integrally joined to the fuel rail 110 by brazing at the injector annular portion 123. When the injector holder 120 is brazed to the fuel rail 110, the injector holder 120 is temporarily assembled to the fuel rail 110, and then brazed at both axial ends of the injector annular portion 123 and heated in the brazing furnace. To do.

  As a result, the molten wax spreads between the inner peripheral surface (the brazing surface 123 </ b> C) of the injector annular portion 123 and the outer peripheral surface of the fuel rail 110, thereby forming a wax layer 161. At this time, the air between the inner peripheral surface of the injector annular portion 123 and the outer peripheral surface of the fuel rail 110 escapes from the injector through-hole 123A, so that the melted solder can spread uniformly on the brazing surface 123C without any gap. it can.

  3, 4, and 6, the fuel pressure sensor boss 140 includes a fuel pressure sensor connecting portion 141 integrally with the fuel pressure sensor annular portion 143. A fuel pressure sensor connection hole 141 </ b> A to which the fuel pressure sensor 104 is connected is formed in the fuel pressure sensor connection portion 141. The fuel pressure sensor connection hole 141A opens on the lower side opposite to the internal combustion engine body 6, that is, on the rear obliquely lower side.

  A fuel passage 143B is formed in the fuel pressure sensor annular portion 143. The fuel passage 143B opens to the inner peripheral surface of the fuel pressure sensor annular portion 143 and communicates with the fuel pressure sensor connection hole 141A. The fuel passage 143B is disposed coaxially with the fuel pressure sensor connection hole 141A.

  A brazing surface 143 </ b> C that is integrally joined to the outer peripheral surface of the fuel rail 110 is formed on the inner peripheral surface of the fuel pressure sensor annular portion 143. The brazing surface 143 </ b> C is formed so as to be in contact with the outer peripheral surface of the fuel rail 110 substantially without a gap.

  A brazing layer 162 made of copper braze or the like is provided between the brazing surface 143C of the annular portion 143 for the fuel pressure sensor and the outer peripheral surface of the fuel rail 110, and the annular portion 143 for the fuel pressure sensor is formed by the brazing layer 162. And the fuel rail 110 are integrally and liquid-tightly joined.

  The annular portion 143 for fuel pressure sensor has a through hole 143A for fuel pressure sensor that penetrates from the brazing surface 143C to the outer peripheral surface of the annular portion 143 for fuel pressure sensor. The through-hole 143A for fuel pressure sensor faces the fuel passage 143B across the central axis of the fuel rail 110. In other words, the fuel pressure sensor through-hole 143A is disposed at a position 180 degrees away from the fuel passage 143B in the circumferential direction of the fuel rail 110.

  Thus, the fuel pressure sensor boss 140 is integrally joined to the fuel rail 110 by brazing at the fuel pressure sensor annular portion 143. When the fuel pressure sensor boss 140 is brazed to the fuel rail 110, the fuel pressure sensor boss 140 is temporarily assembled to the fuel rail 110 and placed at both ends in the axial direction of the fuel pressure sensor annular portion 143. Heat in the furnace.

  As a result, molten wax spreads between the inner peripheral surface (brazing surface 143 </ b> C) of the annular portion 143 for the fuel pressure sensor and the outer peripheral surface of the fuel rail 110, thereby forming a wax layer 162. At this time, the air between the inner peripheral surface of the fuel pressure sensor annular portion 143 and the outer peripheral surface of the fuel rail 110 escapes from the through hole 143A for the fuel pressure sensor, so that the molten solder spreads uniformly over the brazing surface 143C without any gap. be able to.

  Next, the operation will be described. According to the fuel supply device for an internal combustion engine of the present embodiment, the fuel supply device 100 of the internal combustion engine 10 includes a plurality of injector holders that respectively hold a plurality of injectors 103 that directly inject fuel into the combustion chamber 11 of the internal combustion engine body 6. 120 and a cylindrical fuel rail 110 that extends along the cylinder row direction of a plurality of cylinders and distributes fuel to the injector 103 via the injector holder 120.

  The fuel rail 110 is formed with an injector communication hole 111 for supplying fuel to the injector 103 via the injector holder 120. The injector holder 120 includes a fuel rail 110 at a position where the injector communication hole 111 is located. An annular annular portion for injector 123 that surrounds the outer peripheral surface is provided.

  With this configuration, since the fuel rail 110 at the portion where the injector communication hole 111 is located is surrounded by the injector annular portion 123 of the injector holder 120, the fuel rail 110 can be reinforced by the injector annular portion 123. It is possible to increase the rigidity of the portion around the injector communication hole 111. Thereby, it is possible to prevent local stress from being concentrated around the injector communication hole 111 by the high-pressure fuel, and the life of the fuel rail 110 can be extended.

  In addition, the outer peripheral surface of the injector annular portion 123 can protrude outward in the radial direction of the fuel rail 110 from the outer peripheral surface of the fuel rail 110. As a result, when the internal force of the internal combustion engine body 6 or the vehicle body part moves toward the fuel rail 110 due to an external force acting on the vehicle, the internal combustion engine body 6 or the vehicle body part contacts the injector annular portion 123.

  For this reason, it is possible to prevent the internal combustion engine main body 6 or the vehicle body parts from directly interfering with the fuel rail 110 and to protect the fuel rail 110. Specifically, the shape of the injector communication hole 111 and the periphery of the injector communication hole 111 can be prevented from being deformed.

  For this reason, it is not necessary to increase the plate thickness of the fuel rail 110 in consideration of interference with vehicle body parts when an external force is applied to the vehicle, so that the weight of the fuel rail 110 can be reduced.

  As a result, the fuel rail 110 can be protected without increasing the weight.

  Further, according to the fuel supply device for an internal combustion engine of the present embodiment, the injector holder 120 has the fastening boss 122 fastened to the internal combustion engine body 6 integrally with the injector holder 120, and the fastening boss 122 is connected to the injector communication. It is arranged close to the hole 111.

  With this configuration, even when the fuel holder 110 is displaced with the fastening boss as a fulcrum when the injector holder 120 interferes with the internal combustion engine body 6 or the vehicle body parts, the injector holder 120 and the injector communication hole 111 are arranged around the injector holder 120 and the injector communication hole 111. Since no bending moment acts on the fuel rail 110, it is possible to prevent the fuel rail 110 from being deformed at a portion around the injector communication hole 111.

  Further, according to the fuel supply device for an internal combustion engine of the present embodiment, the fuel pressure sensor boss 140 for fixing the fuel pressure sensor 104 for detecting the fuel pressure in the fuel rail 110 is provided on the fuel rail 110, and the fuel pressure sensor boss 140 is provided. Is arranged between two injector holders 120 adjacent to each other in the cylinder row direction, and the fuel pressure sensor boss 140 has a fuel pressure sensor annular portion 143 surrounding the outer peripheral surface of the fuel rail 110.

  With this configuration, even when an external force acts on the vehicle and the internal combustion engine body 6 moves to the vehicle body part side, or the vehicle body part deforms or moves to the fuel rail 110 side, the vehicle body part is the annular portion for the fuel pressure sensor. 143 can prevent directly interfering with the fuel rail 110, and can protect the fuel rail 110.

  Further, according to the fuel supply device for an internal combustion engine of the present embodiment, the brazing surface 123C that is integrally joined to the outer peripheral surface of the fuel rail 110 is formed on the inner peripheral surface of the injector annular portion 123, A brazing surface 143 </ b> C that is integrally joined to the outer peripheral surface of the fuel rail 110 is formed on the inner peripheral surface of the fuel pressure sensor annular portion 143.

  With this configuration, the injector annular portion 123 and the fuel pressure sensor are connected to the fuel rail 110 by brazing at the brazing surfaces 123C and 143C of the injector annular portion 123 and the fuel pressure sensor annular portion 143 and integrally joining them. The annular portion 143 can be assembled.

  Further, according to the fuel supply device for an internal combustion engine of the present embodiment, the injector annular portion 123 has the injector through-hole 123A penetrating from the brazing surface 123C to the outer peripheral surface of the injector annular portion 123, and is a fuel pressure sensor. The annular portion 143 has a fuel pressure sensor through-hole 143A that penetrates from the brazing surface 143C to the outer peripheral surface of the fuel pressure sensor annular portion 143.

  With this configuration, air escapes from the brazing surfaces 123C and 143C to the outer peripheral surfaces via the injector through hole 123A and the fuel pressure sensor through hole 143A, so that the brazing surfaces 123C and 143C are brazed. 123C and 143C can be uniformly distributed.

  Therefore, the injector annular portion 123 and the fuel pressure sensor annular portion 143 are even on the outer peripheral surface of the fuel rail 110 over the entire brazed surface 123C of the injector annular portion 123 and the entire brazed surface 143C of the fuel pressure sensor annular portion 143. Can be contacted respectively, and stress can be dispersed.

  Further, according to the fuel supply device for an internal combustion engine of the present embodiment, the internal combustion engine 10 includes the intake manifold 14 that is connected to the internal combustion engine body 6 and introduces air into the combustion chamber 11. The intake manifold 14 includes a surge tank 12 disposed behind the internal combustion engine body 6 and the intake branch pipe 13 extending from the surge tank 12 toward the front of the vehicle and connected to the rear portion of the internal combustion engine body 6. Have. The fuel rail 110 is disposed below the intake branch pipe 13 and between the surge tank 12 and the internal combustion engine body 6.

  With this configuration, by arranging the fuel rail 110 between the surge tank 12 and the internal combustion engine body 6, it is possible to configure the entire internal combustion engine 10 in a compact manner, and when an external force acts on the vehicle 1, The fuel rail 110 can be protected by the injector annular portion 123 of the injector holder 120.

  Specifically, as shown in FIG. 7, when an external force is applied to the vehicle 1 as indicated by an arrow from the front, the front portion of the vehicle is deformed so as to be shortened in the front-rear direction, and the internal combustion engine body 6 is rearward. It is displaced toward the dash panel 3 side. Then, the surge tank 12 having a relatively large internal space disposed at the rearmost end of the intake manifold 14 contacts the dash panel 3.

  At this time, if the intake branch pipe 13 is greatly curved, the intake branch pipe 13 is deformed in the middle thereof, so that the surge tank 12 cannot be greatly deformed and the surge tank 12 cannot absorb the shock.

  In the present embodiment, since the intake branch pipe 13 has a shape extending in a substantially horizontal direction when viewed from the side of the vehicle, when the intake manifold 14 collides with the dash panel 3, before the intake branch pipe 13 is deformed. The surge tank 12 having a large volume is pressed against the dash panel 3 by the internal combustion engine body 6 and the intake branch pipe 13, and is deformed in the direction of compression in the front and rear direction of the vehicle.

  Thus, the surge tank 12 can be reliably deformed before the intake branch pipe 13 is deformed, so that the shock applied to the internal combustion engine body 6 can be absorbed by the surge tank 12. Therefore, the amount of deformation of the dash panel 3 can be reduced, and the fuel rail 110 can be protected by preventing direct interference between the dash panel 3 and the fuel rail 110.

  Further, since the intake branch pipe 13 extends in the horizontal direction with respect to the vehicle 1 in a side view of the vehicle, even when an external force is applied to the vehicle 1 from the front, the intake branch pipe 13 is not easily broken from the middle. . Therefore, the surge tank 12 can be reliably collided with the dash panel 3 and the intake manifold 14 can be prevented from being deformed from the middle of the intake branch pipe 13 to the fuel rail 110 side. Therefore, the fuel rail 110 can be protected by avoiding strong interference between the fuel rail 110 and the vehicle body parts and the parts of the internal combustion engine 10.

  While embodiments of the invention have been disclosed, it will be apparent to those skilled in the art that changes may be made without departing from the scope of the invention. All such modifications and equivalents are intended to be included in the following claims. For example, the shape of the annular portion for injector 123 and the annular portion for fuel pressure sensor 143 may be any shape that surrounds the fuel rail 110 from the outside, and is not limited to an annular shape, and may be a shape such as a polygon or an ellipse. The shapes of the injector annular portion 123 and the fuel pressure sensor annular portion 143 do not have to be a shape that surrounds the entire surface of the fuel rail 110 on the outer peripheral side, and may be partially cut away.

  6 ... Internal combustion engine body, 10 ... Internal combustion engine, 11 ... Combustion chamber, 12 ... Surge tank, 13 ... Intake branch pipe, 14 ... Intake manifold, 100 ... Fuel supply Device ... 103 injector 104 ... fuel pressure sensor 110 ... fuel rail 111 ... injector communication hole 122 ... fastening boss 123 ... injector annular portion 123A ... .Injector through hole, 123C ... brazing surface, 140 ... fuel pressure sensor boss, 143 ... fuel pressure sensor annular portion, 143A ... fuel pressure sensor through hole, 143C ... brazing surface

Claims (6)

A plurality of injector holders each holding a plurality of injectors that directly inject fuel into the combustion chamber of the internal combustion engine body;
A fuel supply apparatus for an internal combustion engine, which has a cylindrical fuel rail that extends along a cylinder row direction of a plurality of cylinders and distributes fuel to the injectors via the injector holder.
An injector communication hole for supplying fuel to the injector via the injector holder is formed in the fuel rail.
A fuel supply device for an internal combustion engine, wherein the injector holder is provided with an annular annular portion for an injector surrounding an outer peripheral surface of the fuel rail at a portion where the injector communication hole is located. The injector holder has a fastening boss to be fastened to the internal combustion engine main body integrally with the injector holder,
The fuel supply device for an internal combustion engine according to claim 1, wherein the fastening boss is disposed in proximity to the communication hole for the injector. A fuel pressure sensor boss for fixing a fuel pressure sensor for detecting a fuel pressure in the fuel rail is provided on the fuel rail,
The fuel pressure sensor boss is disposed between two injector holders adjacent to each other in the cylinder row direction,
3. The fuel supply device for an internal combustion engine according to claim 1, wherein the fuel pressure sensor boss has a fuel pressure sensor annular portion surrounding an outer peripheral surface of the fuel rail. 4. A brazing surface that is integrally joined to the outer peripheral surface of the fuel rail is formed on the inner peripheral surface of the injector annular portion;
The fuel supply for an internal combustion engine according to claim 3, wherein a brazing surface that is integrally joined to an outer peripheral surface of the fuel rail is formed on an inner peripheral surface of the annular portion for the fuel pressure sensor. apparatus. The injector annular portion has an injector through-hole penetrating from the brazing surface to the outer peripheral surface of the injector annular portion,
5. The fuel supply device for an internal combustion engine according to claim 4, wherein the fuel pressure sensor annular portion has a fuel pressure sensor through hole penetrating from the brazing surface to an outer peripheral surface of the fuel pressure sensor annular portion. The internal combustion engine
An intake manifold connected to the internal combustion engine body for introducing air into the combustion chamber;
The intake manifold has a surge tank disposed behind the internal combustion engine body and an intake branch pipe extending from the surge tank toward the front of the vehicle and connected to a rear portion of the internal combustion engine body. And
6. The internal combustion engine according to claim 1, wherein the fuel rail is disposed below the intake branch pipe and between the surge tank and the main body of the internal combustion engine. Engine fuel supply.

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