JP2005098225A - Fuel injection valve mounting structure for cylinder injection engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent floating of a fuel injection valve while reducing the number of fixation parts of a delivery pipe and to improve assembling performance by reducing the number of the fixation parts. <P>SOLUTION: This fuel injection valve mounting structure for a cylinder injection engine is provided with the fuel injection valve directly injecting fuel to a combustion chamber of the engine, a holding tool fitted to the fuel injection valve and compressible in an axial direction, and the delivery pipe wherein a plurality of insertion parts are arranged at a position offset to one side from an axial line of a fuel supply pipe part extending in a cylinder row direction of the engine, and wherein the plurality of fixation parts are arranged at a position offset to the other side from the axial line between the insertion parts. The fuel injection valve is sandwiched between the engine and the delivery pipe and held in the axial direction, together with the holding tool. Fan-shaped connection parts enlarging toward the adjacent fixation parts are formed on outer peripheral faces of the insertion parts, and the insertion parts are connected to the fuel supply pipe part via the connection parts. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a fuel injection valve mounting structure for an in-cylinder injection engine, and in particular, an insertion portion of a delivery pipe can be firmly connected to a fixed portion via a fuel supply pipe portion, while reducing the number of fixed portions. The present invention relates to a fuel injection valve mounting structure for a direct injection engine that can prevent the fuel injection valve from floating and can improve the assemblability by reducing the number of fixed portions.

  Some in-cylinder injection engines provided with a fuel injection valve that directly injects fuel into a combustion chamber are equipped with a fuel injection valve between the engine and a delivery pipe fixed to the engine. The fuel injection valve is held by the engine with the front end facing the combustion chamber, and the rear end is held by the delivery pipe.

In the conventional fuel injection valve mounting structure, in order to prevent the fuel injection valve from floating due to combustion pressure when the fuel injection valve is pressed against the engine with a delivery pipe fixed to the engine, Some have a fixing portion for the engine in the vicinity of the insertion portion for inserting the fuel injection valve of the pipe.
JP-A-8-312502 JP 2002-70691 A

  By the way, in the fuel injection valve mounting structure of the cylinder injection engine, the fuel injection valve that directly injects fuel into the combustion chamber between the engine and the delivery pipe fixed to the engine is provided with a holder that can be compressed in the axial direction. When installing, due to space limitations, a plurality of insertion parts for inserting the rear end of the fuel injection valve are disposed at a position offset to one side from the axis of the fuel supply pipe part of the delivery pipe. In some cases, a plurality of fixing portions are provided for fixing to the engine at a position offset to the other side from the axis of the fuel supply pipe portion.

  However, this fuel injection valve mounting structure prevents the fuel injection valve from being lifted by combustion pressure because the insertion portion and the fixing portion of the delivery pipe are disposed apart on both sides of the axis of the fuel supply pipe portion. Therefore, it is necessary to dispose a large number of fixing parts in the vicinity of the insertion part.

  For this reason, this fuel injection valve mounting structure has the disadvantage that the number of fixing parts of the delivery pipe increases, the structure becomes complicated, and the assemblability deteriorates.

  The present invention includes a fuel injection valve that directly injects fuel into a combustion chamber of an engine, a holder that is attached to the fuel injection valve and can be compressed in the axial direction, and a fuel supply pipe that extends in the cylinder row direction of the engine. A plurality of insertion portions for inserting the fuel injection valve are disposed at a position offset to one side from the axis, and a fixing portion for fixing the engine to a position offset from the axis to the other side between the insertion portions. A fuel injection valve mounting structure for an in-cylinder injection engine, wherein the fuel injection valve is sandwiched between the engine and the delivery pipe together with the holder and held in the axial direction. A fan-shaped connecting portion that extends toward the adjacent fixing portion is formed on the outer peripheral surface of the inserting portion, and the inserting portion is connected to the fuel supply pipe portion via the connecting portion. .

In the fuel injection valve mounting structure for a direct injection engine according to the present invention, a fan-shaped connecting portion extending toward an adjacent fixing portion is formed on the outer peripheral surface of the insertion portion of the delivery pipe, and the insertion portion is inserted through the connecting portion. By connecting to the fuel supply pipe part, the insertion part of the delivery pipe can be firmly connected to the fixed part via the fuel supply pipe part.
For this reason, this fuel injection valve mounting structure can prevent the fuel injection valve from floating while reducing the number of fixed parts, can improve the assemblability by reducing the number of fixed parts, Since the connecting portion can be accommodated in a recess formed on the engine side in order to accommodate the fuel injection valve, there is no need to change peripheral components.

The fuel injection valve mounting structure for a direct injection engine according to the present invention has a fixing part adjacent to the outer peripheral surface of the insertion part of the delivery pipe in order to prevent the field fuel injection valve from floating while reducing the number of fixing parts. A fan-shaped connecting portion that spreads out is formed, and the insertion portion is connected to the fuel supply pipe portion via this connecting portion.
Embodiments of the present invention will be described below with reference to the drawings.

  1 to 11 show a first embodiment of the present invention. In FIG. 2, 2 is an in-cylinder injection engine having multiple cylinders (hereinafter simply referred to as “engine”), 4 is a cylinder block, 6 is a cylinder head, 8 is a combustion chamber, 10 is a fuel injection valve, and 12 is a holding member. The tool 14 is a delivery pipe. The engine 2 includes a plurality of combustion chambers 8, for example, three combustion chambers 8 formed by a cylinder block 4, a cylinder head 6, and pistons (not shown), and an intake port 16 (see FIG. 1) and an exhaust port (not shown). The engine 2 of this embodiment is provided with two intake ports 16 and two exhaust ports for each combustion chamber 8.

  The engine 2 is provided with a fuel injection valve 10 that directly injects fuel into the combustion chamber 8. The fuel injection valve 10 is held by the cylinder head 6 with its front end facing the combustion chamber 8 of the engine 2, and the rear end is held by the delivery pipe 14 via a holder 12 that can be compressed in the axial direction.

  In the mounting structure of the fuel injection valve 10 of the engine 2, a head side holding portion 18 is provided in the cylinder head 6, and a head side holding hole 20 communicating with the combustion chamber 8 is provided in the head side holding portion 18. 20 is provided with a head-side insertion hole 22 having a large diameter, a head-side abutment surface 24 which is tapered in the radial direction in the head-side insertion hole 22, and a mounting portion 26 for fixing the delivery pipe 14. A bolt screw hole 28 is provided in the mounting portion 26.

  As shown in FIG. 3, the fuel injection valve 10 includes a nozzle shaft portion 30 facing the combustion chamber 8, a connection shaft portion 32 held by the delivery pipe 14 via the holder 14, and the nozzle shaft portion 30 and the connection shaft. The main body shaft portion 34 connecting the portion 32 and the connector portion 36 are included.

  The nozzle shaft portion 30 is provided with a nozzle 38 for injecting fuel at the tip. The connection shaft portion 32 is provided with a protrusion 40 at the rear end, and a backup ring 42 and a seal member 44 are attached to the protrusion 40. The main body shaft portion 34 is provided on the nozzle shaft portion 30 side by forming a first abutting surface 46 that tapers in the radial direction and abuts against the head side abutting surface 24. A second abutting surface 48 that extends in the radial direction in a planar shape is formed on the connecting shaft 32 side, and a positioning projection 50 is provided on the second abutting surface 48.

  The holder 12 is attached to a main body portion 52 made of a rubber material, a one-side end plate portion 54 made of a metal material attached to one axial end surface of the main body portion 52, and an axially other end surface of the main body portion 52. And the other end plate portion 56 made of a metal material.

  The main body 52 is formed in a substantially partially cut cylinder shape having a slit that extends from the vicinity of one end in the axial direction to the other end, and is externally mounted on the connecting shaft portion 32 of the fuel injection valve 10. The one side end plate portion 54 is formed in a substantially C shape, is attached to one end surface in the axial direction of the main body portion 52, and contacts the second contact surface 48 of the fuel injection valve 10. The one side end plate portion 54 is provided with a positioning groove portion 58 with which the protrusion portion 50 of the fuel injection valve 10 is engaged. The other side end plate portion 56 is formed in a substantially O-shape, is attached to the other axial end surface of the main body portion 52, and comes into contact with a later-described pipe side contact surface 78 of the delivery pipe 14.

  As shown in FIGS. 4 to 11, the delivery pipe 14 is provided with a fuel supply pipe portion 60 extending in the cylinder row direction of the engine 2, and an insertion portion 62 for inserting the rear end of the connecting shaft portion 32 of the fuel injection valve 10. And a fixing portion 64 for fixing to the mounting portion 26 of the cylinder head 6 is provided.

  The fuel supply pipe portion 60 is formed in a substantially quadrangular prism shape having a substantially long rectangular cross section. A connection flange 66 for connecting a fuel supply pipe (not shown) is provided on one end side, and one end side of the connection flange 66 is opened. A fuel supply passage 68 that is closed on the other end side is provided. The fuel supply pipe portion 60 is provided with a sensor mounting flange 70 for attaching a fuel pressure sensor (not shown) at an intermediate portion. The sensor mounting flange 70 is provided with a sensor insertion hole 72 and a sensor screw hole 74.

  The insertion portion 62 is provided with an insertion hole 76 that communicates at one end side with the fuel supply passage 68 and opens at the other end side so as to insert the protruding portion 40 of the connecting shaft portion 32 of the fuel injection valve 10. A pipe-side contact surface 78 that is in contact with the plate portion 56 is formed and provided. The fixing portion 64 is provided with a bolt insertion hole 80.

  The delivery pipe 14 is provided with a plurality of insertion portions 62 for inserting the fuel injection valves 10 at positions offset to one side from the axis C of the fuel supply pipe portion 60 extending in the cylinder row direction of the engine 2. A plurality of fixing portions 64 that are fixed to the engine 2 are disposed at positions that are offset from the axis C to the other side between 62.

  In this embodiment, three insertion portions 62 are disposed at positions offset from the axis C of the fuel supply pipe portion 60 to one side in the direction intersecting the axis C, and between the three insertion portions 62 and at both ends. The four fixing portions 64 are disposed at positions that are offset from the axis C to the other side in the direction intersecting the axis C outside the insertion portion 62. The plurality of fixing portions 64 are arranged so that each insertion portion 62 arranged on one side of the axis C is sandwiched from both sides in the axis C direction on the other side of the axis C.

  On the outer peripheral surface of the insertion portion 62, a fan-shaped connecting portion 82 that extends toward the adjacent fixing portion 64 is formed. The connecting portion 82 includes a one-side connecting portion 82a and an other-side connecting portion 82b that are provided on both sides of the insertion portion 62 in the axis C direction. The delivery pipe 14 is provided by connecting the insertion portion 62 to the fuel supply pipe portion 60 through the connecting portion 82.

  Further, the fuel supply pipe portion 60 protrudes on the outer peripheral surface of the fuel injection valve 10 on the opposite side with respect to the opening direction of the insertion hole 76 of the insertion portion 62 into which the fuel injection valve 10 is inserted. Reinforcing ribs 84 extending in the longitudinal direction are formed and provided. The delivery pipe 14 is provided with a connecting portion 82 connected to the side surface of the reinforcing rib 84. In this embodiment, an upper connection portion 82 c that connects the upper surface of the insertion portion 62 to the side surface of the reinforcing rib 84 is provided as the connection portion 82.

  Next, the operation will be described.

  As shown in FIG. 3, the attachment structure of the fuel injection valve 10 of the engine 2 is mounted on the connecting shaft portion 32 of the fuel injection valve 10 by mounting the holder 12 on the second contact surface 48 of the main body shaft portion 32. The one end plate portion 54 of the holder 12 is brought into contact with the projection portion 50 and the groove portion 58 to be positioned. As shown in FIG. 2, the fuel injection valve 10 equipped with the holder 12 inserts the nozzle shaft portion 30 into the head side holding hole 20 of the cylinder head 6 so that the nozzle 38 faces the combustion chamber 8, and the main body shaft portion 34. The first contact surface 46 is brought into contact with the head-side contact surface 24 of the cylinder head 6.

  The fuel injection valve 10 in which the first contact surface 46 is in contact with the head-side contact surface 24 inserts the protruding portion 40 of the connecting shaft portion 32 into the insertion hole 76 of the insertion portion 62 of the delivery pipe 14 and seal member. 44, the pipe-side contact surface 78 of the delivery pipe 14 is brought into contact with the other end plate 56 of the other end in the axial direction of the holder 12.

  The fuel injection valve 10 causes the first contact surface 46 to contact the head-side contact surface 24, causes the one end plate 54 of the holder 12 to contact the second contact surface 48, and the delivery pipe 14. With the other end plate portion 56 of the holder 12 in contact with the pipe-side contact surface 78, the pipe-side attachment portion 64 of the delivery pipe 14 is brought into contact with the attachment portion 26 of the cylinder head 6, and the bolt is inserted. The mounting bolt 86 inserted through the hole 80 is screwed into the bolt screw hole 28 and tightened to compress the main body 52 of the holder 12.

  Thus, the fuel injection valve 10 is sandwiched between the cylinder head 6 of the engine 2 and the delivery pipe 14 fixed to the cylinder head 6 together with the axially compressible holder 12, and the compressed holder 12 is compressed. It is held in the axial direction by the restoring force of the main body 52.

  As shown in FIG. 1, the fuel injection valve 10 has a mounting structure in which a fan-shaped one-side connecting portion 82 a and an other-side connecting portion 82 b that extend toward the fixing portion 64 adjacent to the outer peripheral surface of the insertion portion 62 of the delivery pipe 14. Is formed, and the insertion portion 62 is connected to the fuel supply pipe portion 60 via the connection portion 82, thereby fixing the insertion portion 62 of the delivery pipe 14 via the fuel supply pipe portion 60. The portion 64 can be firmly connected.

  Moreover, in this embodiment, the connecting portion 82 is connected not only to the one side connecting portion 82a and the other side connecting portion 82b on both sides in the axis C direction of the inserting portion 62 but also to the reinforcing rib 84 on the upper side of the inserting portion 62. Since the upper connection portion 82c is provided, the three directions other than the direction in which the insertion hole 76 of the insertion portion 62 opens can be connected to the fuel supply pipe portion 60, and the connection can be more firmly established.

  For this reason, the mounting structure of the fuel injection valve 10 can prevent the fuel injection valve 10 from being lifted while reducing the number of the fixed portions 64, and can improve the assemblability by reducing the number of the fixed portions 64. In addition, since the connecting portion 82 can be housed in the recess 88 between the intake ports 16 formed on the engine 2 side to house the fuel injection valve 10, there is no need to change peripheral parts.

  In addition, the fuel injection valve 10 mounting structure projects on the outer peripheral surface of the fuel supply pipe 60 to the opposite side to the opening direction of the insertion section into which the fuel injection valve 10 is inserted, and the fuel supply pipe 60 A reinforcing rib 84 extending in the longitudinal direction is formed and provided, and a connecting portion 82 is connected to the side surface of the reinforcing rib 84.

  For this reason, in the mounting structure of the fuel injection valve 10, the insertion portion 62 can be more firmly connected to the fixed portion via the fuel supply pipe portion 60 by the reinforcing rib 84, thereby preventing the fuel injection valve 10 from being lifted. be able to.

  FIG. 12 shows a second embodiment of the present invention. The mounting structure of the fuel injection valve 10 of this embodiment is composed of a fan-shaped one-side connecting portion 82a and another-side connecting portion 82b extending toward the adjacent fixing portion 64 on the outer peripheral surface of the insertion portion 62 of the delivery pipe 14. The connecting portion 82 is formed and provided, and the insertion portion 62 is connected to the fuel supply pipe portion 60 through the connecting portion 82, and a spherical upper connecting portion 90 is formed on the upper portion of the inserting portion 62. The insertion portion 62 is connected to the reinforcing rib 84 via the upper connection portion 90.

  In the mounting structure of the fuel injection valve 10 according to this embodiment, the insertion portion 62 is connected to the fuel supply pipe portion 60 via the connecting portions 82 on both sides in the axis C direction of the insertion portion 62, and the upper portion of the insertion portion 62 is further connected. By connecting the insertion portion 62 to the reinforcing rib 84 via the upper connecting portion 90, the insertion portion 62 of the delivery pipe 14 is firmly connected not only to the fuel supply pipe portion 60 but also to the fixing portion 64 via the reinforcing rib 84. Therefore, the fuel injection valve 10 can be prevented from being lifted more reliably while reducing the number of the fixed portions 64.

  FIG. 13 shows a third embodiment of the present invention. The mounting structure of the fuel injection valve 10 of this embodiment is different from the axis C between the insertion portions 62 with respect to the insertion portion 62 at a position offset from the axis C of the fuel supply pipe portion 60 of the delivery pipe 14 to one side. The fixing portion 64 at a position offset to the side is disposed so that the distance D between the center of the insertion hole 76 and the center of the bolt insertion hole 80 is equal, and toward the insertion portion 62 adjacent to the outer peripheral surface of the fixing portion 64. A fan-like connecting portion 92 is formed and provided, and the fixing portion 64 is connected to the fuel supply pipe 60 via the connecting portion 92.

  In the mounting structure of the fuel injection valve 10 of this embodiment, the mounting bolt inserted into the fixing portion 64 is arranged so that the distances D to the fixing portions 64 adjacent to both sides with respect to the insertion portion 62 are equal. Since the clamping force by 86 can be applied to the insertion portion 62 evenly, it is possible to prevent the fuel injection valve 10 from being lifted by applying an equal clamping force to each of the plurality of fuel injection valves 10. Further, by connecting the fixing portion 64 to the fuel supply pipe 60 via the connecting portion 92 on the outer peripheral surface of the fixing portion 64, the insertion portion 62 and the fixing portion 64 are connected to the fuel supply pipe portion 60, respectively. Since it can connect more firmly via the connection part 92, the lift of the fuel injection valve 10 can be prevented further reliably, reducing the number of the fixing | fixed part 64. FIG.

  The fuel injection valve mounting structure for a direct injection engine according to the present invention can prevent the fuel injection valve from lifting while reducing the number of fixed portions of the delivery pipe, and can be applied to the mounting of the fuel injection valve of the direct injection engine. can do.

It is a top view of the delivery pipe by the arrow I of FIG. 2 which shows 1st Example. It is principal part sectional drawing of the engine which shows 1st Example. It is a perspective view of the assembly state of the fuel injection valve which shows 1st Example. It is a top view of the delivery pipe which shows 1st Example. It is a rear view of the delivery pipe which shows 1st Example. It is a front view of the delivery pipe which shows 1st Example. It is a bottom view of the delivery pipe which shows 1st Example. It is a side view by the arrow VIII of FIG. 6 which shows 1st Example. It is sectional drawing by the IX-IX line of FIG. 4 which shows 1st Example. It is sectional drawing by the XX line of FIG. 4 which shows 1st Example. It is sectional drawing by the XI-XI line of FIG. 4 which shows 1st Example. It is an expansion perspective view of the insertion part of the delivery pipe which shows 2nd Example. It is a top view of the delivery pipe which shows 3rd Example.

Explanation of symbols

2 Engine 6 Cylinder Head 8 Combustion Chamber 10 Fuel Injection Valve 12 Holder 14 Delivery Pipe 16 Intake Port 26 Mounting Portion 30 Nozzle Shaft Portion 32 Connection Shaft Portion 34 Main Body Shaft Portion 36 Connector Portion 60 Fuel Supply Pipe Portion 62 Insertion Portion 64 Fixing Portion 68 Fuel supply passage 76 Insertion hole 80 Bolt insertion hole 82 Connecting part 84 Reinforcement rib

Claims (2)

  A fuel injection valve that directly injects fuel into the combustion chamber of the engine, a holder that is attached to the fuel injection valve and that can be compressed in the axial direction, and one side from the axis of the fuel supply pipe that extends in the cylinder row direction of the engine A plurality of insertion portions for inserting the fuel injection valve are disposed at positions offset from each other, and a plurality of fixing portions are disposed between the insertion portions to be fixed to the engine at positions offset from the axis to the other side. A fuel injection valve mounting structure for an in-cylinder injection engine, wherein the fuel injection valve is sandwiched between the engine and the delivery pipe together with the holder and held in the axial direction. An in-cylinder injection air is characterized in that a fan-shaped connecting portion extending toward the adjacent fixed portion is formed on the outer peripheral surface, and the insertion portion is connected to the fuel supply pipe portion via the connecting portion. Fuel injection valve mounting structure of gin.   A reinforcing rib is formed on the outer peripheral surface of the fuel supply pipe portion so as to protrude in the opposite direction to the opening direction of the insertion portion into which the fuel injection valve is inserted and extend in the longitudinal direction of the fuel supply pipe portion. The fuel injection valve mounting structure for a direct injection engine according to claim 1, wherein the connecting portion is connected to a side surface of the rib.

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