JP6521785B2 - Fuel delivery pipe - Google Patents

Description

  The present invention relates to a fuel delivery pipe.

  Conventionally, in internal combustion engines and the like, a fuel delivery pipe is used which distributes and supplies fuel such as gasoline transferred from a fuel tank through a fuel supply pipe to injectors connected to a plurality of cylinders of the engine (for example, Literature 1). In the configuration disclosed in Patent Document 1, a valve for attaching a fuel injection valve to an outer peripheral surface of a pipe main body (main pipe) in which a fuel supply path (main pipe hole) extending along a long longitudinal direction is formed. A mounting member (injector socket) is provided. Also, a pipe main body (main pipe) is mounted as a member for attaching the head body (cylinder head) of the engine to a position separated from the valve mounting member (injector socket) on the outer peripheral surface of the pipe main body (main pipe). It has a boss (bracket).

JP, 2012-246811, A

  By the way, in such an internal combustion engine, various engine layouts are adopted. Among them, for example, an engine layout in which the mounting position of the injector socket must be disposed at a position shifted radially outward from the center position of the diameter of the main pipe with respect to the main pipe, a so-called offset position. The thing of In such a case, the attachment of the injector socket to the main pipe may become unstable.

  Therefore, apart from the bracket for mounting the main pipe of the fuel delivery pipe to the cylinder head, it is conceivable to use a bracket for the injector socket in order to reinforce the mounting strength (bonding strength) of the injector socket to the main pipe. However, using brackets of different shapes over a plurality of places in a limited space is not efficient because it complicates the construction of the fuel delivery pipe, and is not preferable in cost.

  The present invention has been completed based on the above circumstances, and it is a fuel delivery excellent in strength and rigidity that secures the joint strength of the injector socket to the main pipe while securing the attachment strength of the main pipe to the cylinder head. Intended to provide a pipe.

  In order to solve the above-mentioned problems, according to the present invention, a main pipe having a main pipe hole for passing fuel formed therein, an injector socket disposed on an outer peripheral surface of the main pipe for mounting an injector, and the main pipe to a cylinder head A fuel delivery pipe having a bracket for mounting the fuel cell, the injector socket having a bottomed cylindrical shape with one end opened to allow insertion of the injector, and the one end And an outwardly extending flange portion, the bracket being joined to the outer peripheral surface of the main pipe and having an upright wall-like main pipe joint portion standing in the cylinder axial direction of the injector socket, and the cylinder of the injector socket Curved socket covering part covering at least a part of the outer peripheral surface of the part, the main pipe joint part and the socket covering part A plate-like portion disposed in a form supported by a surface, the plate-like portion contacting the flange portion in a state where the cylindrical portion of the injector socket is inserted through a first through hole penetrating the plate And the plate-like portion has a second through hole through which a bolt for attachment to the cylinder head is inserted.

  According to the fuel delivery pipe of the present invention, the bracket for attaching the main pipe to the cylinder head reinforces the attachment of the injector socket to the main pipe. That is, it is not necessary to separately provide a bracket for reinforcing the attachment of the injector socket to the main pipe, and the reduction of the number of parts and the cost reduction can be realized.

  In the fuel delivery pipe, the bracket is composed of a first bracket and a second bracket, the first bracket has the main pipe joint portion and the socket cover portion surface, and the second bracket is the plate It can have a shape.

  According to such a fuel delivery pipe, the first bracket and the second bracket are separate members, and the plate-like portion of the second bracket is an upright wall joint portion of the first bracket and a curved upright wall socket cover The parts are arranged in such a manner as to be supported by the plate surface. In other words, the wall-shaped main pipe joint portion and the curved wall-shaped socket covering portion hold down the plate-like portion to the cylinder head side (the engine side). Further, in a state in which the cylindrical portion of the injector socket is inserted into the first through hole penetrating the plate-like portion, it is extended outward of one end (the end on the side where the injector is inserted) When the fuel is injected to the engine through the injector inserted into the injector socket, when the injector socket is pushed in the direction opposite to the engine, (2) The bracket suppresses the reaction force, and the second bracket is suppressed by the first bracket. Thereby, the attachment of the main pipe to the cylinder head can be made stronger.

  In the fuel delivery pipe, the injector socket has a socket side through hole formed by penetrating the side wall in the inner and outer direction, and the main pipe connects the main pipe hole and the socket side through hole of the injector socket. And the main pipe side through hole penetrating the outer peripheral surface in the inner and outer direction, and the socket cover portion is at least opposite to the socket side through hole in the outer peripheral surface of the cylindrical portion of the injector socket It can cover the side.

  According to such a fuel delivery pipe, since the socket cover portion covers at least the side opposite to the socket side through hole of the outer peripheral surface of the cylindrical portion of the injector socket, the fuel is transmitted from the main pipe to the main tube side through hole and socket side When the pressure is fed to the opposite side of the socket side through hole in the radial direction of the cylindrical portion when it is fed to the injector socket through the through hole, the socket cover portion suppresses the pressure. A bracket with a part makes it possible to reinforce the attachment of the injector socket to the main pipe.

  In the fuel delivery pipe, an outer peripheral surface of a portion of the main pipe where the main pipe side through hole is formed conforms to an outer peripheral surface of a portion of the injector socket where the socket side through hole is formed. It can be concave in the inner diameter direction.

  According to the fuel delivery pipe of the present invention, the outer peripheral surface of the main pipe at the portion where the main pipe side through hole is formed conforms to the outer peripheral surface of the injector socket at the portion where the socket side through hole is formed The main pipe and the injector socket are joined in a state where the outer peripheral surface of the portion where the main pipe side through hole is formed and the outer peripheral surface of the portion where the socket side through hole is formed. can do. This makes it possible to arrange the axes of the injectors in a layout other than orthogonal (so-called offset) with respect to the axes of the main pipe. Further, even in the case where the main pipe and the injector socket can be coupled by surface contact, the outer peripheral surface of the main pipe is recessed in the inner diameter direction in this manner, for example, the outer peripheral surface of the side wall of the injector socket The injector socket can have a simple shape as compared with the case where the cylinder is recessed in the inner diameter direction of the cylinder. Specifically, by forming the injector socket in a bottomed cylindrical shape without a recess, it is possible to simplify the process for obtaining the accuracy of the inner diameter tolerance inside the cylinder.

  According to the present invention, it is possible to provide a fuel delivery pipe excellent in strength and rigidity, securing the joint strength of the injector socket to the main pipe while securing the attachment strength of the main pipe to the cylinder head.

Simplified perspective view schematically showing an automobile provided with a fuel supply device according to the present embodiment FIG. 2 is a perspective view showing an essential part of a fuel delivery pipe provided in the fuel supply system shown in FIG. A view from above (from the Y direction side) of a portion of the fuel delivery pipe of FIG. 2 (a mode in which the second injector socket and bracket are joined from the left end) from above IV-IV sectional view of FIG. 3 V-V sectional view of FIG. 2 In the fuel delivery pipe of FIG. 2, a view showing an assembling aspect of a part of the main pipe to which the first bracket is joined and a second bracket in which the cylindrical portion of the injector socket is inserted into the first through hole.

Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. The upper side in FIG. 4 will be described as “upper” and the lower side as “lower (cylinder head 17A side)”. The structures of the main pipe, the injector socket, and the bracket will be described using the second structure from the left end in FIG.
FIG. 1 is a simplified perspective view schematically showing an automobile provided with the fuel supply device of the present embodiment. The fuel supply device 10 is mounted on the vehicle body 15 of the automobile 1 and supplies fuel from the fuel tank 16 to the engine 17. The fuel supply device 10 includes a fuel supply pump 11, a filter 12, a pressure adjusting device 13, a fuel transfer pipe P1, a fuel supply pipe P2, a fuel return pipe P3, and a fuel delivery pipe 20 (hereinafter referred to as "delivery pipe"). ) And.

  The fuel supply pump 11 pressurizes the fuel in the fuel tank 16. The pressurized fuel is transferred from the fuel tank 16 to the engine 17 by the fuel transfer pipe P1. The transferred fuel is filtered by the filter 12 and sent to the fuel supply pipe P2 via the pressure regulator 13. The pressure of the fuel supplied to the fuel supply pipe P2 is regulated by the pressure regulator 13. A portion of the fuel sent to the fuel supply pipe P2 is supplied to the engine 17 by the delivery pipe 20 connected to the fuel supply pipe P2, and the remaining fuel is returned to the fuel tank 16 through the fuel return pipe P3. Be

  Here, the fuel broadly includes gasoline, fuel containing a high concentration of alcohol, or a mixed fuel of gasoline and alcohol. Also, as the alcohol, for example, methanol, ethanol, butanol and propanol can be used.

(Delivery pipe 20)
As shown in FIG. 2, the delivery pipe 20 has a main pipe 30 in which a main pipe hole 31 for passing fuel is formed, an injector socket 40 disposed on the outer peripheral surface 30A of the main pipe 30 for mounting an injector, and A bracket 570 disposed on the outer peripheral surface 30A for mounting the main pipe 30 to the cylinder head 17A. The delivery pipe 20 is configured by joining a main pipe 30 with a separate injector socket 40 and a bracket 570. Here, "joining" means joining these members together, for example, by brazing or welding.

  As shown in FIG. 2, the delivery pipe 20 has an injector socket in which the insertion direction of the injector (not shown) (the axial direction of the injector socket 40) is orthogonal to the axis of the elongated main pipe 30. 40 are connected. Then, in the delivery pipe 20, a plurality of injector sockets 40 are arranged side by side along the axial direction (longitudinal direction) of the main pipe 30, and the injector socket 40 and the main pipe 30 are attached to attach each injector socket 40 to the main pipe 30. The brackets 570 are connected to each other. In the delivery pipe 20, each of the injector sockets 40 is shifted radially outward (laterally, up and down on the sheet in FIGS. 3 and 5) with respect to the center position of the diameter of the main pipe 30 according to the layout of the engine 17. It is arranged at the offset position.

(Main pipe 30)
For example, the main pipe 30 is made of metal such as steel, stainless steel, aluminum, copper, etc. As shown in FIGS. It is made into the formed tubular member. The main pipe 30 has a circular cross-sectional view at a portion other than the portion where the concave portions 34A and 35A are formed. Then, as shown in FIG. 1, the main pipe 30 is connected to the fuel supply pipe P2 at one end and sealed at the other end. As shown in FIGS. 4 to 6, the main pipe 30 is formed with a main pipe side through hole 33 formed by penetrating the outer peripheral surface 30 </ b> A in the inner and outer directions. The main pipe side through hole 33 is formed on the side of the main pipe 30 (on the left side in FIG. 4, at an angle of approximately 90 ° with the cylinder head 17A side) when the main pipe 30 is attached to the cylinder head 17A. ing.

  As shown in FIGS. 5 and 6, in the main pipe 30, the outer peripheral surface 34 of the portion where the main pipe side through hole 33 is formed is recessed inward in the radial direction of the main pipe 30 than the other outer peripheral surface 30 </ b> A. In other words, the outer periphery of the main pipe side through hole 33 is a socket recess 34A which is partially recessed from the other outer peripheral surface 30A. The socket recess 34A follows the outer peripheral surface 45 of the cylindrical portion 41 of the injector socket 40, which will be described later, at a location where the socket side through hole 44 is formed. Specifically, the socket concave portion 34A is formed in a curved shape curving in an arc shape along the axial direction of the main pipe 30 with the main pipe side through hole 33 as a center (see FIG. 6). The socket recess 34A is formed by pressing a part of the peripheral wall of the cylindrical main pipe 30.

  In the main pipe 30, as shown in FIGS. 3 and 5, the outer peripheral surface 35 of the portion where the main pipe joint portion 53 of the first bracket 50 constituting the bracket 570 described later is joined is the main pipe 30 than the other outer peripheral surface 30A. Inward in the radial direction of the In other words, the outer peripheral surface 35 of the portion where the main pipe joint portion 53 is joined is a bracket recessed portion 35A which is partially recessed from the other outer peripheral surface 30A. The bracket recess 35A has a shape that follows the main pipe joint portion 53 of the first bracket 50. Specifically, the concave bottom portion 35S of the bracket concave portion 35A is formed so as to be substantially parallel to the axis of the main pipe 30. The bracket recess 35A is also formed by pressing a part of the peripheral wall of the cylindrical main pipe 30.

(Injector socket 40)
The injector socket 40 is made of metal, and as shown in FIG. 4, the bottomed cylindrical cylindrical portion 41 with one end 42 opened and the one end 42 of the cylindrical portion 41 outward ( And a flange portion 46 extending outward from the side wall 43 of the cylindrical portion 41 and in a direction intersecting the cylinder axis direction. An injector can be inserted into this open end 42. The injector socket 40 has a substantially straight shape without irregularities in the height direction (vertical direction in FIG. 4) of the cylindrical portion 41, and is formed by press molding.

  In the cylindrical portion 41, a socket side through hole 44 is formed which penetrates the side wall 43 at a position close to the cylinder bottom portion 48 in the inner and outer directions. The size (diameter) of the hole on the socket side through hole 44 corresponds to the size of the hole on the main pipe side through hole 33 described above. A tapered surface 42P is formed at one end 42 of the cylindrical portion 41 in such a manner that the inner diameter increases toward the end (the lower side in FIG. 4), and a flange 46 is formed at the end of the tapered surface 42P. There is. When an injector (not shown) is attached to one end 42 of the injector socket 40, a seal member (not shown) such as an O-ring is disposed between the outer peripheral surface of the injector and the inner peripheral surface 41B of the cylindrical portion 41. And the fuel in the cylindrical portion 41 is supplied to the engine 17 through the injector.

  Of the inner peripheral surface 41B of the cylindrical portion 41, the lower end 47D (the lower half in FIG. 4) into which the seal material and the injector are inserted is subjected to polishing after press forming in order to obtain the accuracy of the inner diameter tolerance. There is. On the other hand, on the upper end 47U (upper half in FIG. 4) of the inner peripheral surface 41B of the cylindrical portion 41 on the cylinder bottom 48 side, such post-processing is not performed. Thus, the inner circumferential surface 41B of the cylindrical portion 41 has a two-step shape with the portion (upper end 47U) not to be the portion (lower end 47D) to be polished. That is, according to the fuel delivery pipe 20 in the present embodiment, the side wall 43 of the injector socket 40 has a substantially straight shape without unevenness by providing the recess (recess 34A for socket) on the main pipe 31 side. The forming process of the injector socket 40 is simplified so that post-processing is performed only on the part where sealing is required.

(Joining of main pipe 30 and injector socket 40)
When the injector socket 40 is attached to the main pipe 30, the main pipe through hole 33 of the main pipe 30 and the socket side through hole 44 of the injector socket 40 are positioned so as to communicate with each other. In other words, the main pipe side through hole 33 communicates the main pipe hole 31 with the socket side through hole 44, and the socket side through hole 44 communicates the main pipe side through hole 33 with the inside of the cylindrical portion 41. With such a configuration, the fuel flowing from the fuel supply pipe P2 into the main pipe hole 31 is fed into the cylindrical portion 41 of each injector socket 40 via the main pipe side through hole 33 and the socket side through hole 44, It is further distributed to each injector.

  Further, as described above, the outer peripheral surface 34 of the main pipe 30 at the portion where the main pipe through hole 33 is formed is the outer peripheral surface 45 of the cylindrical portion 41 of the injector socket 40 at the portion where the socket side through hole 44 is formed. The main pipe 30 and the injector socket 40 can be joined while the outer peripheral surface 34 of the main pipe 30 and the outer peripheral surface 45 of the injector socket 40 are in surface contact with each other. Thus, even when the mounting position of the injector socket 40 is shifted to the outside in the radial direction with respect to the central position of the diameter of the main pipe 30 with respect to the main pipe 30 as in the present embodiment, The attachment of the injector socket 40 to the main pipe 30 is strong.

(Bracket 570)
The bracket 570 is configured of a first bracket 50 and a second bracket 70 as shown in FIGS. The first bracket 50 is parallel to the axis of the main pipe 30 and has an upright wall-like flat plate portion 51 standing in the axial direction of the injector socket 40 and an outer peripheral surface 41 A of the cylindrical portion 41 of the injector socket 40 And a socket cover 52 in the form of a curved upstanding wall standing in a direction. In other words, the socket cover portion 52 is formed by bending a part of the flat plate portion 51 starting from the boundary 55.

  The first bracket 50 is attached to the main pipe 30 by joining the upper portion 53U of the main pipe joint portion 53 to the bracket recess 35A of the main pipe 30. (See Figure 3). The main pipe joint portion 53 is formed such that its length (height) in the rising direction is substantially the same as the length in the cylinder axial direction of the cylindrical portion 41 of the injector socket 40. The height of the flat plate portion 51 is formed to be lower toward one end 54 (the lower left side in FIG. 6 and the end opposite to the socket cover 52) than the main pipe joint 53. The one end 54 is not joined to the main pipe 30. Further, the height of the socket cover 52 is also directed from the boundary 55 between the flat plate 51 and the socket cover 52 to one end 56 (upper right in FIG. 6, the end opposite to the main pipe joint 53). It is formed to be low enough. That is, in the flat plate portion 51, the boundary 55 and the main pipe joint portion 53 are formed to be the highest in the rising direction (see FIG. 6). On the other hand, the bottom surface 51M of the flat plate portion 51 to the bottom surface 52M of the socket cover portion 52, that is, the bottom surface 50M of the first bracket 50 is horizontal so as to be parallel to the axial center of the main pipe 30.

  The socket cover portion 52 is an outer peripheral surface 41A of the cylindrical portion 41 of the injector socket 40 in a state where the main pipe side through hole 33 of the main pipe 30 and the socket side through hole 44 of the injector socket 40 are connected to communicate with each other. It has a curved upright shape that follows Thereby, in a state where the injector socket 40 and the bracket 570 are joined to the main pipe 30, the inner wall 52B of the socket cover 52 is in surface contact so as to wrap the outer peripheral surface 41A of the cylindrical portion 41, and the injector socket 40 is attached to the main pipe 30 Will be reinforced (see Figure 4). Also, although the socket cover portion 52 is formed so that the tip end 56S of one end 56 thereof does not contact the outer peripheral surface 30A of the main pipe 30, the socket cover 52 is not of the outer peripheral surface 41A of the cylindrical portion 41. It is configured to cover up to the opposite side surface (facing wall) of the socket side through hole 44 in the radial direction (see FIGS. 3 and 5). When the socket cover 52 is viewed from above, it has an arc shape, and in the state where the first bracket 50 is attached to the main pipe 30, one surface is formed by the inner wall 52 B of the socket cover 52 and the outer peripheral surface 34 of the main pipe 30. A substantially circular space K with a missing part is formed.

  The second bracket 70 is a flat member as shown in FIG. 6 and is for inserting a first through hole 71 for inserting the cylindrical portion 41 of the injector socket 40 and a bolt (not shown). The second through holes 72 are respectively formed, and portions where the through holes 71 and 72 are not formed are taken as a plate-like portion 73. The hole axis of the first through hole 71 and the hole axis of the second through hole 72 are formed to be parallel to each other.

  In the second bracket 70, a portion of the upper surface 73U of the plate-like portion 73 is located below the bottom surface 51M of the flat plate portion 51 of the first bracket 50 and the bottom surface 52M of the socket cover 52 (bottom surface 50M of the first bracket 50). It joins in the form supported from the cylinder head 17A side) (refer FIG. 2, 6). That is, the second bracket 70 is disposed such that the plate-like portion 73 is substantially perpendicular to the rising direction of the first bracket 50. As described above, in the second bracket 70 disposed to support the first bracket 50 joined to the main pipe 30 from below, a second through hole 72 through which a bolt for fastening to the cylinder head 17A is inserted is formed. The main pipe 30 is attached to the cylinder head 17A by fastening a bolt to the cylinder head 17A through the second through hole 72. In the assembling mode of the first bracket 50 and the second bracket 70, a part of the upper surface 73U of the plate-like portion 73 in the second bracket 70 fastened to the cylinder head 17A via the second through hole 72 is erected. It can also be said that it is configured to be held down by the bottom surface 50M of the first bracket 50 in the shape of a circle.

  Further, the size of the first through hole 71 in the second bracket 70 is provided such that only the cylindrical portion 41 of the injector socket 40 can be inserted. That is, the flange portion 46 provided at one end 42 of the cylindrical portion 41 can not be inserted. Thus, when the injector socket 40 is inserted from below into the first through hole 71 from below, the flange surface 46 abuts on the lower surface 73D of the plate-like portion 73 and locks it. (See Figures 4 and 6). In other words, the lower surface 73D of the plate-like portion 73 of the second bracket 70 is assembled so as to hold the flange portion 46 of the injector socket 40 toward the cylinder head 17A from above.

  With such a configuration, when fuel is injected from the injector to the engine, the reaction force causes the injector socket 40 to be pushed upward (toward the cylinder bottom portion 48). Since the plate-like portion 73 of the second bracket 70 holds down and the second bracket 70 is held down by the bottom surface 50M of the first bracket 50, the entire bracket 570 holds such a reaction force toward the cylinder head 17A. As a result, the injector socket 40 can be reduced. Further, since the first bracket 50 constituting the bracket 570 is joined to the main pipe 30, the attachment of the main pipe 30 to the cylinder head 17A can be further strengthened.

(Method of joining main pipe 30, injector socket 40 and bracket 570)
As a method of joining the main pipe 30, the injector socket 40, and the bracket 570, as shown in FIGS. 3 and 6, the first bracket 50 is used for the bracket recess 35A formed in the outer peripheral surface 30A (35) of the main pipe 30. The upper portion 53U of the main pipe joint 53 in the above is joined by surface contact. On the other hand, the injector socket 40 is inserted from the lower side (lower surface 73D side) from the lower side (the lower surface 73D side) of the first through hole 71 formed in the second bracket 70 from the cylinder bottom 48 side, and the lower surface 73D and the flange portion 46 of the injector socket 40 are Join.

  Then, the second bracket 70 in which the cylindrical portion 41 of the injector socket 40 is inserted into the first through hole 71 is disposed below the first bracket 50, and the cylindrical portion 41 of the injector socket 40 is the inner wall of the socket cover portion 52 The two members are joined such that the space K formed by the outer surface 30A (34) of the main pipe 30 passes through the space 52B and the upper surface 73U of the plate-like portion 73 abuts on the bottom surface 50M of the first bracket 50. In other words, the first bracket 50 joined to the main pipe 30 is disposed so as to be pressed from above with respect to the second bracket 70 in which the injector socket 40 is inserted, and both members are joined. At this time, positioning is performed so that the main pipe side through hole 33 of the main pipe 30 and the socket side through hole 44 of the injector socket 40 communicate with each other. Thus, the socket recess 34A formed in the outer peripheral surface 30A (34) of the main pipe 30 and the outer peripheral surface 45 of the portion where the socket side through hole 44 is formed are joined by surface contact. The outer circumferential surface 41A and the inner wall 52B of the socket cover 52 are joined by surface contact.

  As described above, for the main pipe 30, the injector socket 40 and the bracket 570, the second structure from the left end in FIG. 2 (The injector socket 40 is disposed on the right side toward the main pipe, and the main pipe joining of the first bracket 5 is Although the structure in which the portion 53 is arranged is described, as in the structure at two places on the upper right side in FIG. 2, a symmetrical structure may be used, and these may be appropriately combined and used according to the engine layout Also good.

Subsequently, the operation and effect of the present embodiment will be described.
According to the fuel delivery pipe 20 of the present invention, the attachment of the injector socket 40 to the main pipe 30 is reinforced by the bracket 570 for attaching the main pipe 30 to the cylinder head 17A. That is, it is not necessary to separately provide a bracket for reinforcing the attachment of the injector socket 40 to the main pipe 30, and the reduction of the number of parts and the cost reduction can be realized.

  In addition, the first bracket 50 and the second bracket 70 are separate members, and the plate-like portion 73 of the second bracket 70 has a wall-shaped main pipe joint portion 53 of the first bracket 50 and a curved wall-shaped socket covering portion 52 are arranged to be supported by the plate surface (upper surface 73U). In other words, the wall-shaped main pipe joint portion 53 and the curved wall-shaped socket cover portion 52 hold down the plate-like portion 73 to the cylinder head side (engine side). Further, in a state where the cylindrical portion 41 of the injector socket 40 is inserted into the first through hole 71 penetrating the plate-like portion 73, the outside of one end 42 thereof (the end on the side where the injector is inserted) When the fuel is injected to the engine 17 through the injector inserted into one end 42 of the injector socket 40 because the flange portion 46 extended in the direction abuts against the plate-like portion 73 (lower surface 73D). When the injector socket 40 is pushed in the direction opposite to the engine 17 by the reaction force of the second bracket 70, the second bracket 70 holds down the reaction force, and the first bracket 50 holds down the second bracket 70. Thereby, the attachment of the main pipe 30 to the cylinder head 17A can be made more robust.

  Further, since the socket cover portion 52 covers at least the side surface of the outer peripheral surface 41A of the cylindrical portion 41 of the injector socket 40 opposite to the socket side through hole 44, the fuel flows from the main pipe 30 to the main pipe side through hole 33 and the socket side. When the pressure is fed to the injector socket 40 through the through hole 44 to the opposite side of the socket side through hole 44 in the radial direction of the cylindrical portion 41, the socket cover 52 suppresses the pressure. Thus, the bracket 570 (particularly, the first bracket 50) having the socket cover 52 can reinforce the attachment of the injector socket 40 to the main pipe 30.

  The outer peripheral surface 34 of the main pipe 30 at the portion where the main pipe through hole 33 is formed follows the outer peripheral surface 45 of the injector socket 40 at the portion where the socket side through hole 44 is formed in the inner diameter direction of the main pipe 30. Since it has a concave shape, the main pipe 30 and the main pipe 30 are in a state where the outer peripheral surface 34 of the portion where the main pipe side through hole 33 is formed and the outer peripheral surface 45 of the portion where the socket side through hole 44 is formed. The injector socket 40 can be joined. As a result, the axis of the injector can be arranged in a layout other than orthogonal (so-called offset) with respect to the axis of the main pipe 30. Further, even in the case where the main pipe 30 and the injector socket 40 can be coupled by surface contact, by forming the outer peripheral surface 32 of the main pipe 30 in a recessed shape in the inner diameter direction in this manner, for example, The injector socket 40 can have a simple shape as compared with the case where the outer peripheral surface of the side wall 43 is recessed in the inner diameter direction of the cylinder. Specifically, by forming the injector socket 40 in a bottomed cylindrical shape without a recess, the process for obtaining the accuracy of the inner diameter tolerance in the cylindrical portion 41 can be simplified.

  The present invention is not limited to the embodiments described above with reference to the drawings and can be implemented with various modifications without departing from the scope of the invention.

17A: cylinder head, 20: fuel delivery pipe, 30: main pipe, 30A: outer peripheral surface of main pipe, 31: main pipe hole, 40: injector socket, 41: cylindrical portion of injector socket, 41A: outer peripheral surface of cylindrical portion 41, 42 ... One end of the injector socket, 46 ... flange part 52 ... socket cover part 53 ... main pipe joint part 71 ... first through hole 72 ... second through hole 73 ... plate-like part 570 ... bracket ( 50 ... 1st bracket, 70 ... 2nd bracket)

Claims (3)

Fuel delivery comprising: a main pipe internally formed with a main pipe hole for passing fuel; an injector socket disposed on an outer peripheral surface of the main pipe for mounting an injector; and a bracket for mounting the main pipe to a cylinder head A pipe,
The injector socket has a bottomed cylindrical shape with one end opened to allow insertion of the injector, and has an outwardly extending flange portion at the one end.
The said bracket consists of the 1st bracket and the 2nd bracket which are mutually different members,
The first bracket is a curved upright wall joint joined to the outer peripheral surface of the main pipe and having a wall-like main pipe junction standing in the axial direction of the injector socket and covering at least a part of the outer peripheral surface of the cylindrical portion of the injector socket And a socket cover,
The second bracket is a plate-like portion arranged to support the main pipe joint portion and the socket cover portion by the plate surface, and the injector socket is provided for the first through hole penetrating the plate. And a flat plate-like portion which is in contact with the flange portion in a state where the cylindrical portion is inserted and which is not directly joined to the main pipe,
A fuel delivery pipe characterized in that the plate-like portion has a second through hole through which a bolt for attaching to the cylinder head is inserted. The injector socket has a socket side through hole formed by penetrating the side wall in the inward and outward directions,
The main pipe has a main pipe side through hole formed by penetrating the outer peripheral surface in the inside and outside direction so as to connect the main pipe hole and the socket side through hole of the injector socket,
2. The fuel delivery pipe according to claim 1, wherein the socket cover portion covers at least a side surface opposite to the socket side through hole in the outer peripheral surface of the cylindrical portion of the injector socket. An outer peripheral surface of a portion of the main pipe where the main pipe side through hole is formed is recessed in an inner diameter direction of the main pipe following an outer peripheral surface of a portion of the injector socket where the socket side through hole is formed. The fuel delivery pipe according to claim 2, characterized in that:

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