JP2011047374A - Fuel distributing and supplying structure of direct injection engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel distributing and supplying structure of a direct injection engine in which a plurality of cylinders are laid in line and a high pressure fuel is supplied distributively to the injectors of different cylinders, capable of suppressing a torsion moment acting on the main fuel supply pipe part, and achieve a lightweight construction. <P>SOLUTION: The fuel distributing and supplying structure of the direct injection engine includes the main fuel supply pipe part 20 and a fuel distribution part 21. The fuel distribution part 21 comprises a cup part 22, a fastening boss part 23 arranged in line with the cup part 22 in the direction of the train of cylinders, a fuel distributing pipe part 24 extending from the closed end part 22c of the cup part 22 to the main fuel supply pipe part 20 side and joined with the main fuel supply pipe part 20, a first and second coupling parts 25 and 26 extending from the cup part 22 to the fastening boss part 23 side and coupled with the coupling boss part 23, and a joining part 27 extending to the coupling boss part 23 side from the joining part 24a of the fuel distributing pipe part 24 with the main fuel supply pipe part 20, coupled with the fastening boss part 23, and joined with the main fuel supply pipe part 20. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a fuel distribution and supply structure for a direct injection engine in which high pressure fuel is distributed and supplied to injectors of the respective cylinders of a direct injection engine in which a plurality of cylinders are arranged in a line.

  A fuel injection / distribution structure for a direct injection engine in which high pressure fuel is distributed and supplied to an injector for each cylinder of a direct injection engine in which a plurality of cylinders are arranged in a row is known as a prior art.

  The fuel distribution and supply structure disclosed in Patent Document 1 is integrally formed so as to protrude vertically from a main pipe (fuel main supply pipe) extending in parallel to the right side of the cylinder head of the in-line four-cylinder engine. The injector holder extends toward the injector of each cylinder. An accommodation hole for accommodating the proximal end side of the injector is provided at the distal end portion of each injector holder. In addition, the tip of the distribution passage that branches off from the fuel passage in the main pipe is opened in the accommodation hole, and the fuel pumped from the high-pressure fuel pump to the main pipe is distributed to each cylinder from the fuel passage. Through the distribution passage, it reaches the accommodation hole, is supplied to the fuel introduction port of the injector facing the accommodation hole, and is directly injected from the injector into the combustion chamber of the cylinder. Further, each injector holder is formed with a through hole at a position corresponding to the base of the cylinder head, and a fastening bolt (fastening member) is inserted into the through hole.

JP 2000-234560 A

  By the way, the fuel in the main pipe is supplied to the injector through the injector holder, and is directly injected from the injector into the combustion chamber of the engine. At this time, since the fuel pressure is extremely high, a strong reaction force acts on the injector holder. To do. For this reason, a strong torsional moment acts on the main pipe, which may reduce reliability.

  In order to solve this problem, it is usually considered to give the main pipe high rigidity, such as increasing the wall thickness of the main pipe. However, if this is done, there is a problem in that the weight of the main pipe and thus the fuel distribution and supply structure becomes heavy. Arise.

  The present invention has been made in view of such a point, and an object of the present invention is to distribute and supply high-pressure fuel to injectors for each cylinder of a direct injection engine in which a plurality of cylinders are arranged in a row. In the fuel distribution and supply structure of the direct injection engine, it is intended to reduce the weight by suppressing the torsional moment from acting on the fuel main supply pipe portion.

  A first aspect of the present invention is a fuel injection / distribution structure of a direct injection engine in which high pressure fuel is distributed and supplied to an injector for each cylinder of a direct injection engine in which a plurality of cylinders are arranged in a row. An extended tubular fuel main supply pipe section; and a fuel distribution section provided on the cylinder side of the fuel main supply pipe section so as to correspond to the cylinders. The fuel distribution section is connected to the injector. A cup portion in which the base end side is accommodated, a fastening boss portion that is arranged side by side in the cylinder row direction with the cup portion, and a fuel supply from the closed end portion of the cup portion. A tubular fuel distribution pipe part extending to the pipe part side and joined to the fuel main supply pipe part; a first connection part extending from the cup part to the fastening boss part side and connected to the fastening boss part; Extending from the cup to the fastening boss From the joint portion between the second connecting portion connected to the cylinder side in the boss axial direction from the connecting portion with the first connecting portion in the fastening boss portion and the fuel main supply pipe portion of the fuel distribution pipe portion. It has a joint part that extends to the fastening boss part side, is connected to the fastening boss part, and is joined to the fuel main supply pipe part.

  According to this, the fuel distribution portion is a cup portion in which the proximal end side of the injector is accommodated, a fastening boss portion that is arranged side by side with the cup portion and the cylinder row direction, and through which a fastening member for engine attachment is inserted, A tubular fuel distribution pipe part that extends from the closed end of the cup part to the fuel main supply pipe part side and is joined to the fuel main supply pipe part, and extends from the cup part to the fastening boss part side and is connected to the fastening boss part. A first connecting portion, a second connecting portion extending from the cup portion toward the fastening boss portion and connected to the cylinder side in the boss axial direction from a connecting portion of the fastening boss portion to the first connecting portion, and a fuel distribution pipe portion From the joint portion of the main fuel supply pipe portion to the fastening boss portion side and connected to the fastening boss portion, and the joint portion joined to the fuel main supply pipe portion. Even if the reaction force acts strongly, the reaction force is applied to the first and second connecting portions and the fuel distribution. Parts, and the joint can be distributed to the fastening boss portion via a torsional moment fuel main supply tube portion can be prevented from acting.

  Further, since the torsional moment is prevented from acting on the fuel main supply pipe portion by the fuel distribution portion in this way, the fuel main supply pipe portion is made to have high rigidity, for example, by increasing the thickness of the fuel main supply pipe portion. This eliminates the need to reduce the weight of the fuel distribution and supply structure.

  Therefore, it is possible to reduce the weight of the fuel distribution and supply structure by suppressing the torsional moment from acting on the fuel main supply pipe portion.

  According to a second aspect of the present invention, in the first aspect of the invention, the fuel distribution portion is an integrally cast product that is integrally cast, and a space portion is formed between the first and second connecting portions. A space portion is formed between the first connecting portion and the joint portion.

  According to this, since the space part is formed between the first and second connection parts and the space part is formed between the first connection part and the joint part, the weight of the fuel distribution part is reduced. This can further reduce the weight of the fuel distribution and supply structure.

  In a third aspect based on the second aspect, the cup portion has an axial direction parallel to the axial direction of the fastening boss portion, and an opening end surface of the cup portion that is closer to the cup shaft than the engine mounting seat surface of the fastening boss portion. The first connecting portion extends obliquely from the closed end of the cup portion with respect to its axial direction, and the second connecting portion is The cup portion extends from the closed end portion of the cup portion in a direction orthogonal to the axial direction thereof, and the first and second connecting portions are characterized in that end portions on the cup portion side are coupled to each other. .

  According to this, the first connecting portion extends obliquely with respect to the axial direction from the closed end portion of the cup portion, and the second connecting portion extends in a direction orthogonal to the axial direction from the closed end portion of the cup portion. Since the first and second connecting portions are connected to each other at the end portions on the cup portion side, the connecting portion of the first and second connecting portions with the cup portion and the fastening boss portion is positioned in a substantially right triangle. It is possible to make three points. For this reason, even if the reaction force of fuel injection acts strongly on the cup portion, the reaction force can be effectively distributed to the fastening boss portion via the first and second connecting portions, and the fuel main supply pipe portion It is possible to further suppress the torsional moment from acting on.

  In a fourth aspect based on the third aspect, the fuel distribution pipe portion extends obliquely from the closed end portion of the cup portion with respect to the axial direction, and the joint portion is formed of the fastening boss portion. It is characterized by being tangentially connected to the outer peripheral surface.

  According to this, although the fastening boss part is arranged so that the axial direction thereof is parallel to the axial direction of the cup part, the fuel distribution pipe part is connected to the axial direction from the closed end part of the cup part. Since it extends diagonally, the fastening member can be easily inserted through the fastening boss portion, and the attachment of the fuel distribution and supply structure to the engine can be maintained.

  Further, since the joining portion is tangentially connected to the outer peripheral surface of the fastening boss portion, even if a reaction force of fuel injection acts strongly on the cup portion, the reaction force is applied to the fastening boss portion via the joining portion. It is possible to effectively disperse and further suppress the torsional moment from acting on the fuel main supply pipe portion.

  According to the present invention, it is possible to reduce the weight of the fuel distribution and supply structure by suppressing the torsional moment from acting on the fuel main supply pipe portion.

It is a schematic sectional drawing which shows the attachment state to the direct injection engine of the fuel distribution supply structure which concerns on embodiment of this invention. It is a top view which shows the fuel distribution supply structure of a direct injection engine. It is a front view which shows the fuel distribution supply structure of a direct injection engine. It is a bottom view which shows the fuel distribution supply structure of a direct injection engine. It is a top view which shows a fuel distribution part. FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 5. FIG. 7 is a sectional view taken along line VII-VII in FIG. 5.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a cross-sectional view showing a state in which a fuel distribution and supply structure according to an embodiment of the present invention is attached to a direct injection engine. The engine 1 includes a plurality of cylinders in an engine longitudinal direction (in FIG. 1) in which a crankshaft extends. In-line multi-cylinder engines arranged in a line in a direction penetrating the paper surface, and in this embodiment, an in-line 4-cylinder engine. On the intake side of the cylinder head 10 of the engine 1, an insertion hole 10 a is formed of a stepped hole that opens toward the combustion chamber for each cylinder and has a small diameter on the combustion chamber side and a large diameter on the opposite side of the combustion chamber. The nozzle portion 11a of the injector (fuel injection valve) 11 is inserted and fixed in the insertion hole 10a so as to face the combustion chamber. A metal fuel distribution and supply structure 2 is attached and fixed to the side surface on the intake side of the cylinder head 10 so as to extend in the cylinder row direction (crank shaft direction).

  In FIG. 1, reference numeral 11b denotes a seal member that is in close contact with the inner peripheral surface of the small-diameter portion of the insertion hole 10a. It is an O-ring that is arranged in the above and performs a liquid-tight seal. Further, 30 is a spacer which is disposed between the opening end surface 22b of the cup portion 22 and the seating surface 11d of the connector connecting base portion of the injector 11, and receives the reaction force of the in-cylinder pressure from the combustion chamber side of the injector 11. Reference numeral 30 denotes a sheet metal molded product interposed between both members so as to have elasticity.

  The fuel distribution and supply structure 2 distributes and supplies high-pressure fuel to the injectors 11 for each cylinder of the engine 1. As shown in FIGS. 1 to 7, the fuel distribution and supply structure 2 is a tubular fuel that extends in the cylinder row direction. A main supply pipe section 20 and a fuel distribution section 21 provided on the cylinder side (engine 1 side) of the fuel main supply pipe section 20 so as to correspond to each cylinder are provided.

  The fuel main supply pipe portion 20 is made of, for example, a stainless steel pipe material. The fuel main supply pipe portion 20 is formed with a circular fuel supply passage 20a extending in the axial direction thereof, and the fuel supply passage 20a has a higher pressure fuel than one end portion in the axial direction (the right end portion in FIG. 2). High-pressure fuel from a pump (not shown) is introduced. The thickness of the fuel main supply pipe portion 20 is relatively thin, for example, 1.5 mm.

  Each of the fuel distributors 21 is an integrally cast product that is integrally cast by a precision casting method such as a lost wax method. Thus, when the fuel distribution part 21 is cast by the precision casting method, it is possible to reduce the weight of the fuel distribution part 21 without waste while giving the fuel distribution part 21 an accurate shape and dimensions. The fuel distributor 21 is disposed so as to protrude vertically from the fuel main supply pipe 20 and extend toward the injector 11.

  Each fuel distribution part 21 is arranged side by side with a cup part 22 in which the base end side of the injector 11 is accommodated, and the cup part 22 in the cylinder row direction, and a fastening bolt (fastening member) for mounting an engine (not shown) is inserted therethrough. A fastening boss portion 23, a tubular fuel distribution pipe portion 24 extending from the closed end portion 22 c of the cup portion 22 to the fuel main supply pipe portion 20 side and joined to the fuel main supply pipe portion 20, and the cup portion 22. From the connection part of the 1st connection part 25 extended in the fastening boss | hub part 23 side and the 1st connection part 25 connected to the fastening boss | hub part 23 from the cup part 22 to the fastening boss | hub part 23 side. Also, the second connecting portion 26 connected to the cylinder side in the boss axial direction and the connecting portion 24a between the fuel distribution pipe portion 24 and the fuel main supply pipe portion 20 extend to the fastening boss portion 23 side and are connected to the fastening boss portion 23. The fuel main supply pipe section 20 And a joint portion 27 joined.

  Of the four fuel distributors 21, 21, 21, and 21, the two on the left side and the two on the right side in FIGS. 2 to 4 are arranged symmetrically with each other. Other than that, it has almost the same configuration. 5 to 7 show the two right fuel distribution portions 21 and 21 in FIGS.

  The cup portion 22 has a substantially cylindrical shape with one end on the cylinder side as an open end and the other end on the side opposite to the cylinder (the side opposite to the engine 1; hereinafter referred to as the anti-cylinder side) as a closed end. The cup portion 22 is formed with an accommodation hole 22a for accommodating and fixing the proximal end side of the injector 11. The downstream end of the fuel distribution passage 24b of the fuel distribution pipe portion 24 is opened in the accommodation hole 22a. . The cup portion 22 is disposed such that its axial direction is parallel to the axial direction of the fastening boss portion 23 and its opening end surface 22b is located on the cylinder side in the cup axial direction with respect to the engine mounting seat surface 23b of the fastening boss portion 23. In this embodiment, the closed end portion 22c is arranged so as to be substantially in the same position as the engine mounting seat surface 23b of the fastening boss portion 23 in the cup axial direction. Thus, when the cup part 22 is arranged on the cylinder side in the cup axial direction with respect to the fastening boss part 23, the swing of the cup part 22 can be suppressed. On both sides of the outer circumferential surface of the cup portion 22 in the cylinder row direction, substantially triangular rib portions 22d and 22d are formed, respectively.

  The fastening boss portion 23 has a substantially cylindrical shape with both ends being open ends, and is arranged so that its axis is aligned with the axis of the cup portion 22 in the cylinder row direction. The fastening boss portion 23 is formed with an insertion hole 23a through which a fastening bolt is inserted. The fuel distribution supply structure 2 is attached and fixed to the cylinder head 10 by the fastening bolt inserted through the insertion hole 23a. It has become. An end surface on the cylinder side in the axial direction of the fastening boss portion 23 constitutes an engine mounting seat surface 23b to which the cylinder head 10 is mounted and fixed.

  The fuel distribution pipe section 24 extends from the fuel main supply pipe section 20 side of the closed end section 22c of the cup section 22 obliquely with respect to the axial direction and in a direction perpendicular to the cylinder row direction. It is brazed to the outer peripheral surface. Since the joint surface of the joint portion 24a with the fuel main supply pipe portion 20 in the fuel distribution pipe portion 24 relieves stress concentration on the fuel main supply pipe portion 20, the outer peripheral surface of the fuel main supply pipe portion 20 It is formed in an arc shape (R shape) so as to follow. A circular fuel distribution passage 24b extending in the axial direction is formed in the fuel distribution pipe portion 24, and an upstream end of the fuel distribution passage 24b opens into the fuel supply passage 20a of the fuel main supply pipe portion 20. ing. On the outer peripheral surface of the fuel distribution pipe portion 24, a plate-like contact portion 24c is formed, on which the jig hits when the fuel distribution and supply structure 2 including the injector 11 is fixed to the cylinder head 10.

  The first connecting portion 25 is rod-shaped and extends obliquely from the central portion of the closed end portion 22c of the cup portion 22 with respect to the axial direction and in the cylinder row direction, and extends in the axial direction of the fastening boss portion 23. It is connected to the end on the non-cylinder side.

  The second connecting portion 26 is a rod-shaped member that is thinner than the first connecting portion 25, and extends from the central portion of the closed end portion 22c of the cup portion 22 in a direction orthogonal to the axial direction and in the cylinder row direction. The boss portion 23 is connected to an end portion on the cylinder side in the axial direction. On both sides in the width direction of the second connecting portion 26, plate-like ribs for connecting the cup portion 22 and the fastening boss portion 23 to each other and for dispersing the reaction force of fuel injection acting on the cup portion 22 to the fastening boss portion 23. Portions 26a and 26a are formed respectively. Of these rib portions 26a, 26a, the one on the fuel main supply pipe portion 20 side is wider than the other one. As for the 1st and 2nd connection parts 25 and 26, the edge part by the side of the cup part 22 is mutually couple | bonded. Since the end portions on the cup portion 22 side of the first and second connecting portions 25 and 26 are thus coupled to each other, the cup portion 22 and the fastening boss portion 23 of the first and second connecting portions 25 and 26 are connected to each other. The connecting parts can be three points that form a substantially right triangle. A substantially triangular space 28 is formed between the first and second connecting portions 25 and 26.

  The joint 27 is connected in a tangential manner to the outer peripheral surface of the end portion on the side opposite to the cylinder in the axial direction of the fastening boss portion 23 continuously with the joint portion 24a of the fuel distribution pipe portion 24 in the cylinder row direction. It is brazed to the outer peripheral surface of the main supply pipe part 20. In this way, since the joint portion 27 extends from the joint portion 24a of the fuel distribution pipe portion 24 in the cylinder row direction, the joint portions 24a and 27 with the fuel main supply pipe portion 20 of the fuel distribution portion 21 are joined by the joint portion 27. Becomes longer in the cylinder row direction, and stress concentration on the fuel main supply pipe portion 20 of the joint portions 24a and 27 can be reduced. The joint surface of the joint portion 27 with the fuel main supply pipe portion 20 has an arc shape so as to follow the outer peripheral surface of the fuel main supply pipe portion 20 in order to relieve stress concentration on the fuel main supply pipe portion 20. (R-shaped). The circumferential length of the fuel main supply pipe 20 is shorter in the joint 27 than in the joint 24 a of the fuel distribution pipe 24. A space portion 29 is formed between the joint portion 27 and the first connecting portion 25. The joint 27 extends to the fastening boss 23 and is connected to the end of the fastening boss 23 on the side opposite to the cylinder in the axial direction. A rod-like rib portion 27a is formed to make the stress uniform.

  Then, the high-pressure fuel pumped from the high-pressure fuel pump to the fuel main supply pipe section 20 is distributed to each cylinder from the fuel supply passage 20a, flows through the fuel distribution passage 24b to the accommodation hole 22a, and this accommodation hole 22a. The fuel is supplied to the fuel inlet of the injector 11 facing the engine and is directly injected from the injector 11 into the combustion chamber of each cylinder. When the fuel is directly injected from the injector 11 into the combustion chamber in this way, the reaction force of this fuel injection acts strongly on the cup portion 22, and the reaction force is applied to the first and second connecting portions 25 and 26, the fuel distribution pipe portion. 24 and the joint portion 27 can be dispersed to the fastening boss portion 23, and the torsional moment can be suppressed from acting on the fuel main supply pipe portion 20.

-Effect-
As described above, according to the present embodiment, the fuel distribution portion 21 is disposed in parallel with the cup portion 22 in which the base end side of the injector 11 is accommodated and the cup portion 22 in the cylinder row direction, and is a fastening bolt for mounting the engine. A fastening boss portion 23 through which the fuel is inserted, a tubular fuel distribution pipe portion 24 extending from the closed end portion 22c of the cup portion 22 to the fuel main supply pipe portion 20 side and joined to the fuel main supply pipe portion 20, and a cup portion A first connecting portion 25 that extends from 22 to the fastening boss portion 23 side and is connected to the fastening boss portion 23 and a first connecting portion 25 that extends from the cup portion 22 to the fastening boss portion 23 side and connects to the first linking portion 25. The fastening boss portion 23 extends from the joint portion 24a between the second coupling portion 26 coupled to the cylinder side in the boss axial direction and the fuel main supply pipe portion 20 of the fuel distribution pipe portion 24 to the fastening boss portion 23 side. Connected to the main fuel supply pipe 20, even if a reaction force of fuel injection acts strongly on the cup portion 22, the reaction force is applied to the first and second connecting portions 25, 26 and the fuel distribution pipe. It is possible to disperse the fastening boss portion 23 via the portion 24 and the joint portion 27, and to suppress the torsional moment from acting on the fuel main supply pipe portion 20.

  Further, since the torsional moment is prevented from acting on the fuel main supply pipe portion 20 by the fuel distribution portion 21 in this way, the fuel main supply pipe portion 20 is made thicker, such as by increasing the thickness of the fuel main supply pipe portion 20. It is not necessary to provide rigidity, and the weight of the fuel distribution and supply structure 2 can be reduced.

  Therefore, it is possible to reduce the weight of the fuel distribution and supply structure 2 by suppressing the torsional moment from acting on the fuel main supply pipe portion 20.

  Further, since the space portion 28 is formed between the first and second connecting portions 25 and 26 and the space portion 29 is formed between the first connecting portion 25 and the joint portion 27, the fuel distribution portion 21. The fuel distribution and supply structure 2 can be further reduced in weight.

  Further, the first connecting portion 25 extends obliquely from the closed end portion 22c of the cup portion 22 with respect to the axial direction, and the second connecting portion 26 is orthogonal to the axial direction from the closed end portion 22c of the cup portion 22. Since the first and second connecting portions 25 and 26 are connected to each other at the end on the cup portion 22 side, the cup portion 22 and the fastening boss portion of the first and second connecting portions 25 and 26 are connected to each other. The connecting portion to the three points can be three points that form a substantially right triangle. For this reason, even if the reaction force of fuel injection acts strongly on the cup portion 22, the reaction force can be effectively distributed to the fastening boss portion 23 via the first and second connecting portions 25, 26, It is possible to further suppress the torsional moment from acting on the fuel main supply pipe portion 20.

  Furthermore, the fastening boss portion 23 is arranged so that its axial direction is parallel to the axial direction of the cup portion 22, but the fuel distribution pipe portion 24 extends from the closed end portion 22 c of the cup portion 22 in its axial direction. Therefore, it is possible to easily insert the fastening bolt into the fastening boss portion 23 and maintain the attachment of the fuel distribution and supply structure 2 to the engine.

  Further, since the joint portion 27 is tangentially connected to the outer peripheral surface of the fastening boss portion 23, even if a reaction force of fuel injection acts strongly on the cup portion 22, the reaction force is transmitted via the joint portion 27. It is possible to effectively disperse the fastening boss portion 23 and to further suppress the torsional moment from acting on the fuel main supply pipe portion 20.

(Other embodiments)
In the above embodiment, the opening end surface 22b of the cup portion 22 is positioned closer to the cylinder side in the cup axial direction than the engine mounting seat surface 23b of the fastening boss portion 23, but the same position with respect to the engine mounting seat surface 23b and the cup axial direction. Alternatively, it may be positioned on the side opposite to the cylinder in the cup axis direction than the engine mounting seat surface 23b. In this case, based on the positional relationship, the connection location between the cup portion 22 and the fastening boss portion 23 of the first and second connection portions 25 and 26 and the extending direction of the first and second connection portions 25 and 26 are changed. There is a need. However, from the viewpoint of suppressing the swing of the cup portion 22, it is desirable that the opening end surface 22 b of the cup portion 22 is positioned closer to the cylinder side in the cup axial direction than the engine mounting seat surface 23 b of the fastening boss portion 23.

  The present invention is not limited to the embodiments, and can be implemented in various other forms without departing from the spirit or main features thereof.

  As described above, the above-described embodiment is merely an example in all respects and should not be interpreted in a limited manner. The scope of the present invention is defined by the claims, and is not limited by the specification. Further, all modifications and changes belonging to the equivalent scope of the claims are within the scope of the present invention.

  As described above, the fuel distribution and supply structure for a direct injection engine according to the present invention can be applied to applications that require a reduction in weight by suppressing the torsional moment from acting on the main fuel supply pipe. .

DESCRIPTION OF SYMBOLS 1 Direct injection engine 11 Injector 2 Fuel distribution supply structure 20 of direct injection engine Main fuel supply pipe part 21 Fuel distribution part 22 Cup part 22b Open end surface 22c Closed end part 23 Fastening boss part 23b Engine mounting seat surface 24 Fuel distribution pipe part 24a Joining portion 25 First connecting portion 26 Second connecting portion 27 Joining portion 28 Space portion 29 Space portion

Claims (4)

A fuel distribution and supply structure for a direct injection engine in which high pressure fuel is distributed and supplied to an injector for each cylinder of a direct injection engine in which a plurality of cylinders are arranged in a row,
A tubular fuel main supply pipe extending in the cylinder row direction;
A fuel distribution section provided to correspond to each cylinder on the cylinder side of the fuel main supply pipe section;
The fuel distributor is
A cup portion in which the proximal end side of the injector is accommodated;
A fastening boss part that is arranged side by side in the cylinder row direction with the cup part, and through which a fastening member for engine attachment is inserted,
A tubular fuel distribution pipe part extending from the closed end of the cup part to the fuel main supply pipe part side and joined to the fuel main supply pipe part;
A first connecting portion extending from the cup portion toward the fastening boss portion and connected to the fastening boss portion;
A second connecting portion extending from the cup portion toward the fastening boss portion and connected to the cylinder side in the boss axial direction from a connecting portion of the fastening boss portion to the first connecting portion;
A connecting portion that extends from a joint portion of the fuel distribution pipe portion to the fuel main supply pipe portion toward the fastening boss portion, is connected to the fastening boss portion, and is joined to the fuel main supply pipe portion; A fuel distribution and supply structure for a direct injection engine. The fuel distribution and supply structure for a direct injection engine according to claim 1,
The fuel distributor is an integrally cast product that is integrally cast,
A space is formed between the first and second connecting parts,
A fuel distribution and supply structure for a direct injection engine, wherein a space is formed between the first connecting portion and the joint portion. The fuel distribution and supply structure for a direct injection engine according to claim 2,
The cup portion is arranged such that its axial direction is parallel to the axial direction of the fastening boss portion, and its opening end surface is located on the cylinder side in the cup axial direction from the engine mounting seat surface of the fastening boss portion. And
The first connecting portion extends obliquely with respect to the axial direction from the closed end portion of the cup portion,
The second connecting portion extends from the closed end of the cup portion in a direction perpendicular to the axial direction thereof,
The first and second connecting portions are connected to each other at the cup portion side, and the fuel distribution and supply structure for a direct injection engine. The fuel distribution and supply structure for a direct injection engine according to claim 3,
The fuel distribution pipe part extends obliquely with respect to the axial direction from the closed end of the cup part,
The fuel distribution and supply structure for a direct injection engine, wherein the joint portion is tangentially connected to the outer peripheral surface of the fastening boss portion.

Images