JP4101141B2 - Fuel injection device for internal combustion engine - Google Patents

Description

  The present invention relates to a fuel injection device that supplies fuel to an internal combustion engine, and more particularly to a technique for fixing a fuel injection valve to an internal combustion engine.

  Conventionally, a yoke-like clamp has been used to fix the fuel injection valve to the internal combustion engine. In a cylinder injection type internal combustion engine to which a cylinder internal pressure is directly applied, the yoke-shaped clamp has a role of maintaining airtightness between the fuel injection valve and the internal combustion engine (cylinder head) and sealing the cylinder internal pressure. . Generally, when using a yoke-shaped clamp, the body part (main body part) of the fuel injection valve is fixed to the cylinder head, so a certain amount of tightening torque is required for fixing (assembling). Assembling work space for rotating was required.

  In view of this, a shaft seal technique has been proposed in which the pressure in the cylinder is sealed by maintaining airtightness between the tip of the fuel injection valve and the accommodating portion (assembly portion) of the tip of the fuel injection valve in the cylinder head. In this shaft seal technology, a leaf spring is disposed between the fuel delivery pipe fixed to the cylinder head and the fuel injection valve, and the fuel injection valve inserted into the cylinder head housing portion is attached to the leaf spring. It is fixed to the cylinder head by the force. Therefore, as compared with the case of using a yoke-shaped clamp, there is an advantage that the assembling work is easy and it is not necessary to secure a working space (see Patent Document 1).

JP 2001-355540 A

  However, the conventional fixing method using a leaf spring has a problem that the urging force is applied to the fuel injection valve at a position away from the cylinder head, so that the bending moment acting on the fuel injection valve is increased. Also, when a plate spring is used, the surface pressure distribution is biased and becomes a partial load, so wear and sag in the combination part of the fuel delivery pipe and the fuel injection valve, and the combination part of the fuel injection valve and the cylinder head. There is also a problem that the shaft sealability is impaired.

  The present invention has been made to solve the above problems, and provides a fuel injection device capable of reducing a bending moment applied to the fuel injection valve and easily assembling the fuel injection valve with respect to the internal combustion engine. For the purpose.

  In order to solve the above problems, a first aspect of the present invention provides a fuel injection device for an internal combustion engine. A fuel injection device for an internal combustion engine according to a first aspect of the present invention has a tip portion in which an injection hole is formed and a flange portion formed on the tip portion side, and is connected to the internal combustion engine at the tip portion. A shaft-seal type fuel injection valve that maintains airtightness between them, a fuel supply pipe that is fixed to the internal combustion engine and has a connection port to which the fuel injection valve is connected, the fuel supply pipe, and the fuel injection And an urging member disposed between the flange portion of the valve and urging the fuel injection valve with respect to the internal combustion engine.

  According to the fuel injection device for an internal combustion engine according to the first aspect of the present invention, the urging member for urging the shaft seal type fuel injection valve with respect to the internal combustion engine includes the fuel supply pipe and the tip of the fuel injection valve. Since it is arranged between the flange portion formed on the side, the point of application of the urging force to the fuel injection valve can be in the vicinity of the internal combustion engine, and the bending moment applied to the fuel injection valve can be reduced. The fuel injection valve can be easily assembled to the internal combustion engine.

  A second aspect of the present invention provides a fuel injection device for an internal combustion engine. A fuel injection device for an internal combustion engine according to a second aspect of the present invention has a tip portion and a flange portion in which injection holes are formed, and a shaft that maintains airtightness between the tip portion and the internal combustion engine. A seal type fuel injection valve, a fuel supply pipe fixed to the internal combustion engine and having a connection port to which the fuel injection valve is connected, and between the fuel supply pipe and a flange portion of the fuel injection valve And an urging member that covers an outer periphery of the fuel injection valve and urges the fuel injection valve with respect to the internal combustion engine.

  According to the fuel injection device for an internal combustion engine according to the second aspect of the present invention, the urging member for urging the shaft seal type fuel injection valve with respect to the internal combustion engine includes the fuel supply pipe and the flange of the fuel injection valve. Since the outer periphery of the fuel injection valve is covered, the urging force acting on the fuel injection valve can be distributed over substantially the entire periphery of the flange portion. Therefore, the fuel injection valve and the internal combustion engine can be combined in an appropriate airtight state, and the generation of a bending moment due to partial load can be reduced. Furthermore, the fuel injection valve can be easily assembled to the internal combustion engine.

  In the fuel injection device for an internal combustion engine according to the first or second aspect of the present invention, the fuel injection valve has an input portion to which a drive current is input, and the urging member is the above-mentioned except for the input portion. A spring member having a substantially C-shaped cross-sectional view covering the outer periphery of the fuel injection valve may be used. In such a case, since the biasing member can be easily assembled to the fuel injection valve, the assembly of the fuel injection valve to the internal combustion engine can also be facilitated.

  In the fuel injection device for an internal combustion engine according to the first or second aspect of the present invention, a positioning portion is formed in the fuel supply pipe, and a positioning portion is formed in a flange portion of the fuel injection valve. The spring member may include a first engagement portion that engages with a positioning portion of the fuel supply pipe and a second engagement portion that engages with a flange portion of the fuel injection valve. In such a case, the rotation direction of the fuel injection valve relative to the internal combustion engine can be defined in a certain direction (position).

  In the fuel injection device for an internal combustion engine according to the first or second aspect of the present invention, each positioning portion formed in the fuel supply pipe and the flange portion of the fuel injection valve is an axis of the fuel injection valve. Instead, the fuel supply pipe may be formed offset to a fixed position side fixed to the internal combustion engine. In such a case, the bending stress acting on the combustion injection valve due to the bending moment acting on the fuel supply pipe around the fixed position can be reduced by the elastic force of the spring member.

  In the fuel injection device for an internal combustion engine according to the first or second aspect of the present invention, the internal combustion engine has a cylinder block having a cylinder and a cylinder head, and the cylinder head has a tip portion of the fuel injection valve. A through hole for exposing the cylinder to directly supply fuel into the cylinder; the fuel supply pipe being fixed to the cylinder head; and the fuel injection device for the internal combustion engine further comprising: A resin sealing material disposed at the tip of the fuel injection valve in order to maintain airtightness between the through hole of the cylinder head and the tip of the fuel injection valve; and the fuel inside the cylinder from the resin sealing material. You may provide the heat insulating material arrange | positioned at the front-end | tip part of an injection valve. In such a case, the heat insulating material can reduce the combustion gas temperature on the resin sealing material and the combustion gas pressure on the resin sealing material. Therefore, the heat resistance of the resin sealing material can be improved. it can. Therefore, good airtightness between the fuel injection valve and the cylinder head can be maintained.

  In the fuel injection device for an internal combustion engine according to the first or second aspect of the present invention, the fuel injection valve includes a connection portion connected to a connection port of the fuel supply pipe, the tip portion, and the connection portion. A cylinder block having a cylinder, a through-hole for leading a tip portion of the fuel injection valve into the cylinder, and a body assembly portion to which the body portion of the fuel injection valve is assembled. A separation distance a between the outer peripheral surface of the connection portion and the inner peripheral surface of the connection port, a separation distance b between the outer peripheral surface of the main body portion and the inner peripheral surface of the main body assembly portion, A relationship of a> b and c> b may be established between the distance c between the outer peripheral surface of the tip and the inner peripheral surface of the through-hole. In such a case, the position of the fuel injection valve with respect to the cylinder head is defined by the main body of the fuel injection valve, and the tip and the connection are free ends. Generation of bending moment generated in the valve can be suppressed.

  Hereinafter, a fuel injection device for an internal combustion engine according to the present invention will be described based on an embodiment with reference to the drawings.

First embodiment:
A schematic configuration of a fuel injection device for an internal combustion engine according to a first embodiment will be described with reference to FIGS. FIG. 1 is an explanatory diagram showing a schematic configuration of an internal combustion engine provided with a fuel injection device according to a first embodiment. FIG. 2 is an explanatory view showing a fuel injection valve constituting the fuel injection device according to the first embodiment. FIG. 3 is a plan view showing a schematic configuration of the fuel injection device according to the first embodiment. FIG. 4 is an explanatory view showing an assembly example of the fuel injection valve and the fuel delivery pipe. FIG. 5 is an explanatory view showing an assembly example of the fuel injection valve constituting the fuel injection device according to the first embodiment with respect to the cylinder head. FIG. 6 is an explanatory view showing an example of a spring member before molding. FIG. 7 is an explanatory view showing a cross section of the spring member cut along a plane perpendicular to the axial direction.

  As shown in FIG. 1, the fuel injection device 10 according to the present embodiment includes a fuel injection valve 11 assembled in the internal combustion engine 20 and a fuel delivery pipe 12 that supplies fuel in the fuel tank FT to the fuel injection valve 11. I have. The fuel injection device 10 is controlled by a fuel injection control computer (not shown).

  As shown in FIG. 2, the fuel injection valve 11 includes a front end portion 11 a having a fuel injection hole 110, a main body portion 11 b assembled to the internal combustion engine 20 (cylinder head 21), and a connection portion 11 c connected to the fuel delivery pipe 12. I have. The fuel injection valve 11 used in the present embodiment is a shaft seal type fuel injection valve, and the tip end portion 11a is provided with a seal member 111 for shaft seal. The main body part 11b has a larger diameter than the tip part 11a, and a flange part 112 having a positioning part 113 is formed on the tip part 11a side. The main body 11b also includes an input unit 114 to which a drive current (drive signal) for the fuel injection valve 11 is input.

  The fuel delivery pipe 12 includes a connection port 121 for connecting the connection portion 11c of the fuel injection valve 11, and a plurality of fixing portions 122 for fixing the fuel delivery pipe 12 to the internal combustion engine 20 (cylinder head 21). . The fixing part 122 has a through hole through which the bolt 45 passes, and the fuel delivery pipe 12 is fixed to the internal combustion engine 20 by the bolt 45 as shown in FIGS. 1 and 3.

  The fuel injection valve 11 is connected to the fuel delivery pipe 12 as shown in FIGS. Specifically, the fuel delivery pipe 12 is assembled by being connected (inserted) to the connection port 121 of the fuel delivery pipe 12. A positioning portion 123 is formed at the connection port 121 of the fuel delivery pipe 12. The connecting portion 11c of the fuel injection valve 11 is provided with a rubber seal member 115 having an outer shape larger than the inner diameter of the connection port 121 of the fuel delivery pipe 12, and the fuel delivery pipe 12 is connected by the seal member 115. Oil tightness in the mouth 121 is maintained.

  In the fuel injection device 10 according to this embodiment, the fuel injection valve 11 and the fuel delivery pipe 12 are combined with the spring member 30 disposed between the flange portion 112 of the fuel injection valve 11 and the fuel delivery pipe 12. It is done. The free length of the spring member 30 is such that when the fuel injection valve 11 and the fuel delivery pipe 12 are combined, the urging force (preload, preload) is obtained, so that the fuel from the flange portion 112 of the fuel injection valve 11 at the time of combination. It is set shorter than the length of the delivery pipe 12 up to the connection port 121.

  The spring member 30 is formed by rounding a flat plate having the slits 31 shown in FIG. 6 into a substantially C shape in cross section as shown in FIG. For example, the width of the slit 31 may be changed according to the acting force applied to the fuel injection valve 11 when the fuel injection valve 11 is assembled to the cylinder head 21. As described above, the spring member 30 having a substantially C-shaped cross section is used, and the lower side (flange portion 112 side) of the spring member 30 and the flange portion 112 of the fuel injection valve 11 are brought into close contact with each other. The urging force is distributed over substantially the entire circumference of the flange portion 112. As a result, since the surface pressure distribution can be made uniform, it is possible to prevent wear of the fuel injection valve 11, the cylinder head 21 and the fuel delivery pipe 12 due to the partial load. Further, since the urging force is applied in parallel to the axial direction of the fuel injection valve 11, it is possible to prevent the generation of a bending moment due to the unbalanced urging force acting.

  The spring member 30 is formed with a positioning projection 32 that engages with the positioning portion 113 of the flange portion 112 of the fuel injection valve 11 and a positioning projection 33 that engages with the positioning portion 123 of the fuel delivery pipe 12.

  The internal combustion engine 20 including the fuel injection device 10 according to this embodiment includes a cylinder head 21, a cylinder block 23 including a plurality of cylinders 22, an intake port 24 for introducing intake air into the cylinder 22, and combustion gas in the cylinder 22. An exhaust port 25 for discharging is provided. Each intake port 24 is provided with an intake valve 241 that is driven by an intake side cam IC to open and close the intake port 24. Each exhaust port 25 is driven by an exhaust side cam EC to open and close the exhaust port 25. An exhaust valve 251 is disposed. A spark plug 26 is disposed in the cylinder head 21 at a position corresponding to the center of each cylinder 22.

  The cylinder head 21 is exposed to the cylinder 22 with a body assembly portion 210 for assembling the body portion 11 b of the fuel injection valve 11 and the fuel injection hole 110 of the fuel injection valve 11, and from the fuel injection hole 110 into the cylinder 22. A through-hole 211 for realizing direct fuel injection is provided. The main body assembly portion 210 includes a first assembly portion 210a for assembling the main body portion 11b of the fuel injection valve 11, and a second assembly portion 210b having a larger diameter than the first assembly portion 210a and for assembling the flange portion 112. Have.

  The cylinder head 21 is also provided with a fuel delivery pipe fixing portion 212 for fixing the fuel delivery pipe 12. The fuel delivery pipe fixing portion 212 is provided corresponding to the fixing portion 122 of the fuel delivery pipe 12, and a screw groove corresponding to the screw portion of the bolt 45 is cut inside.

  When the fuel injection valve 11 is assembled to the cylinder head 21, first, the positioning protrusion 32 of the spring member 30 is engaged with the positioning portion 113 of the flange portion 112 of the fuel injection valve 11, and the spring member with respect to the fuel injection valve 11 is engaged. Wear 30. The positioning portion 113 of the flange portion 112 and the positioning protrusion 32 of the spring member 30 are arranged so that the opening 35 of the spring member 30 is connected to the input portion 114 of the fuel injection valve 11 when the spring member 30 is attached to the fuel injection valve 11. It has a positional relationship to be located at.

  Subsequently, the fuel injection valve 11 is assembled to the fuel delivery pipe 12 by engaging the positioning protrusion 33 of the spring member 30 with the positioning portion 123 of the fuel delivery pipe 12. As a result, the rotational position of the fuel injection valve 11 with respect to the fuel delivery pipe 12 can be defined by the spring member 30. As shown in FIG. 2, the fuel injection valve 11 receives a biasing force of the spring member 30 at the flange portion 112 formed at a position near the tip end portion 11 a, that is, receives a biasing force at a position close to the cylinder head 21. Therefore, the bending moment acting on the fuel injection valve 11 can be reduced.

  When all the fuel injection valves 11 are assembled to the fuel delivery pipe 12, the fuel injection valve 11 and the fuel delivery pipe 12 are assembled to the cylinder head 21. First, a ring-shaped intermediate compression seal gasket 40 is placed on the second assembly portion 210b of the cylinder head 21, and the tip of the fuel injection valve 11 is formed on the cylinder head 21 as shown in FIG. Inserted into the through-hole 211.

  Finally, when the fixing portion 122 of the fuel delivery pipe 12 and the fixing portion 212 of the cylinder head 21 are fixed by the bolt 45, the assembly operation of the fuel injection device 10 to the internal combustion engine 20 is completed. When the fuel delivery pipe 12 is fixed to the cylinder head 21, the spring member 30 is compressed, so that the urging force of the spring member 30 acts on the flange portion 112 of the fuel injection valve 11, and the fuel injection valve 11 is the cylinder head. It is strongly pressed against 21 and fixed.

  As described above, according to the fuel injection device 10 according to the first embodiment, the spring member 30 is located between the flange portion 112 formed near the tip end portion 11 a of the fuel injection valve 11 and the fuel delivery pipe 12. Therefore, the point of action of the urging force of the spring member 30 on the fuel injection valve 11 can be made substantially flush with the cylinder head 21. Therefore, the bending moment acting on the fuel injection valve 11 can be greatly reduced.

  Since the spring member 30 has a substantially C-shaped cross-sectional view, the urging force that acts on the flange portion 112 of the fuel injection valve 11 can be dispersed almost all around the flange portion 112. Therefore, the bending moment which acts on the fuel injection valve 11 due to the partial load can be prevented. Further, since the urging force acting on the intermediate compression seal gasket 40 becomes a distributed load, the crushing allowance of the gasket 40 can be made uniform and the gasket 40 can be made uniform with respect to the cylinder head 21 (second assembly portion 210b). Therefore, it is possible to ensure a good sealing property.

  Further, the bending moment acting on the fuel injection valve 11 is greatly reduced, so that the connection portion 11c of the fuel injection valve 11 and the fuel delivery pipe 12 are joined, and the main body portion 11c of the fuel injection valve 11 and the cylinder head 21 are connected. Reduces the sag of the seal member 111 caused by the bending moment at the contact portion with the main body assembly portion 210 and at the contact portion between the tip portion 11a of the fuel injection valve 11 and the through hole 211 of the cylinder head 21. be able to. Furthermore, since the deformation of the seal member 111 provided at the tip end portion 11a of the fuel injection valve 11 can be made uniform, the sealing property (airtightness) between the tip end portion 11a of the fuel injection valve 11 and the through-hole 211 of the cylinder head 21 is achieved. Sex) can be maintained.

  Further, since the outer periphery of the fuel injection valve 11 is covered by the spring member 30, it is possible to shield the operation sound of the fuel injection valve 11, and further, the heat radiation efficiency is improved by increasing the substantial surface area of the fuel injection valve 11. Can be made.

Second embodiment:
A fuel injection device for an internal combustion engine according to a second embodiment will be described with reference to FIG. FIG. 8 is an explanatory view showing a schematic configuration of a fuel injection valve constituting a fuel injection device for an internal combustion engine according to a second embodiment. The fuel injection valve 50 in the second embodiment is different from the fuel injection valve 11 in the first embodiment in that a heat insulating seal member 118 is provided closer to the cylinder 22 than the seal member 111 at the distal end portion 50a. Since the other components are the same as those of the fuel injection valve 11 in the first embodiment, the same reference numerals are given and description thereof is omitted.

  The heat insulation seal member 118 is a seal member made of, for example, a wire mesh material, takes heat from the combustion gas to reduce the combustion gas temperature, and reduces the combustion gas pressure by the passage resistance of the mesh portion. As a result, for example, the combustion gas whose temperature and pressure are reduced acts on the resin seal member 111, so that the heat resistance reliability and seal reliability of the resin seal member 111 can be improved. The fuel injection valve 50 is particularly useful in a so-called in-cylinder fuel injection device in which the tip 50a is exposed to the cylinder 22 and the tip 50a is exposed to high-temperature and high-pressure combustion gas.

  Moreover, since the temperature of the front-end | tip part 50a of the fuel injection valve 50 can be reduced by providing the heat insulation seal member 118, the reliability of the fuel injection valve 50 can be improved. Furthermore, since a resin material with low heat resistance can be used as the seal member 111, the cost of the fuel injection device can be reduced.

  If FRM is used as the heat insulating seal member 118, it is possible to transfer heat from the tip 50a of the fuel injection valve 50 to the cylinder head 21, so that the temperature of the tip 50a can be further reduced. By using a metal ring (abutment type) as the heat-insulating seal member 118, in addition to reducing the temperature of the tip 50a, it is possible to facilitate the assembly and facilitate the management of the gap with the through-hole 211 (leakage amount management). it can. By using a grooved resin seal material as the heat insulation seal member 118, the seal member 111 and parts can be shared. Further, the pressure of the combustion gas can be reduced by a groove formed in the resin seal material.

Third embodiment:
A fuel injection apparatus for an internal combustion engine according to a third embodiment will be described with reference to FIG. FIG. 9 is an explanatory view showing a schematic configuration of a fuel injection valve constituting a fuel injection device for an internal combustion engine according to a third embodiment. Since the fuel injection valve in the third embodiment includes the same components as the fuel injection valve 11 in the first embodiment, the same reference numerals are given and the description thereof is omitted. In the third embodiment, the main body portion 11b of the fuel injection valve 11 in the first embodiment, in particular, the main body portion 11b corresponding to the first assembly portion 210a is a high-rigidity portion, and the fuel for the cylinder head 21 in the high-rigidity portion. The injection valve 11 is positioned. In such a case, both end portions (the tip portion 11a and the connecting portion 11c) of the fuel injection valve 11 are in a free centering state that does not contribute to positioning, and the load deformation that acts on the fuel injection valve 11 due to the axial deviation of both end portions is prevented. Can be reduced.

  Specifically, as shown in FIG. 9, the separation distance (clearance) a between the outer peripheral surface of the connection portion 11 c of the fuel injection valve 11 and the inner peripheral surface of the connection port 121 of the fuel delivery pipe 12, and the fuel injection valve 11. The distance (clearance) b between the outer peripheral surface of the main body portion 11b and the inner peripheral surface of the first assembly portion 210a (main body assembly portion 210) of the cylinder head 21, and the outer peripheral surface of the tip portion 11a of the fuel injection valve 11 The relationship of a> b and c> b is established between the distance (clearance) c from the inner peripheral surface of the through hole 211 of the cylinder head 21.

  By setting the clearances a, b, and c of each part as described above, it is possible to further eliminate the occurrence of stress acting in the axial direction of the fuel injection valve 11 due to the assembly to the cylinder head 21. The stress does not act on the intermediate compression seal gasket 40, and strict dimensional accuracy with respect to the intermediate compression seal gasket 40 is not required. Therefore, the degree of freedom in setting the compression amount of the intermediate compression seal gasket 40 is increased, and a less expensive member. Can be used.

Fourth embodiment:
A fuel injection apparatus for an internal combustion engine according to a fourth embodiment will be described with reference to FIG. FIG. 10 is an explanatory view showing a schematic configuration of a fuel injection valve constituting a fuel injection device for an internal combustion engine according to a fourth embodiment. In the fuel injection valve 60 in the fourth embodiment, the lower side (flange portion 112 side) of the spring member 61 and the flange portion 112 of the fuel injection valve 11 are not in close contact, and the positioning projection 62 of the spring member 61 is the flange portion 112. This is different from the fuel injection valve 11 in the first embodiment in that it contacts the positioning portion 113 of the first embodiment. Since the other components are the same as those of the fuel injection valve 11 in the first embodiment, the same reference numerals are given and description thereof is omitted.

  In the fuel injection valve 60 according to the fourth embodiment, the positioning portion 113 of the flange portion 112 and the positioning portion 123 of the fuel delivery pipe 12 are arranged with respect to the axis of the fuel injection valve 60 as shown in FIG. Offsets L1 and L2 are offset toward the cylinder head 21 to which the delivery pipe 12 is fixed. That is, the positioning protrusions 62 and 63 of the spring member 61 are assembled so that the elastic force of the spring member 61 acts on the cylinder head 21 side to which the fuel delivery pipe 12 is fixed rather than the axial center of the fuel injection valve 60. It has been.

  In general, the reaction force from the fuel injection valve 60 caused by the fuel pressure acts on the fuel delivery pipe 12 used under a high fuel pressure, and due to the bending moment about the fixed position with respect to the cylinder head 21, It is known that there is a tendency to deform so as to float as indicated by the broken arrow in FIG. Therefore, a bending stress acts on the fuel injection valve 60, and a compressive stress due to the deformation of the fuel delivery pipe 12 acts on the portion of the fuel injection valve 60 on the cylinder head 21 side as indicated by a broken line arrow in FIG. To do.

  The bending stress acting on the fuel injection valve 60 becomes a compressive stress acting on the cylinder head 21 side of the spring member 61, and an elastic force of the spring member 61 is generated. In the fourth embodiment, the spring member 61 is such that the load accompanying the elastic force of the spring member 61 acts on the cylinder head 21 side to which the fuel delivery pipe 12 is fixed, rather than the axial center of the fuel injection valve 60. The positioning projections 62 and 63, the positioning portion 113 of the flange portion 112, and the positioning portion 123 of the fuel delivery pipe 12 are formed and combined. Therefore, the bending stress acting on the fuel injection valve 60 is reduced or offset by the elastic force of the spring member 61 as shown by the solid broken line arrow in FIG. 10, and the deformation of the fuel injection valve 60 can be prevented or suppressed. .

  In the fourth embodiment, the spring member 61 for biasing the fuel injection valve 60 against the cylinder head 21 prevents or suppresses the deformation of the fuel injection valve 60 due to the deformation of the fuel delivery pipe 12 caused by the fuel pressure. can do. Therefore, in comparison with the technique of preventing deformation of the fuel injection valve 60 by interposing an intermediate tube between the fuel delivery pipe 12 and the fuel injection valve 60, the sealing performance of the high-pressure fuel is considered and the number of parts is increased. I don't need it. Further, as compared with a technique for preventing deformation of the fuel injection valve 60 by making a large gap at the connection portion between the fuel delivery pipe 12 and the fuel injection valve 60, the back-up ring does not cause deterioration in assembling workability. It is not necessary to increase the number of parts. Furthermore, the fuel delivery pipe 12 is increased in size and the number of parts to be assembled, compared with a technique for preventing or suppressing the deformation of the fuel injection valve 60 by increasing the rigidity of the fuel delivery pipe 12 and the fixing strength of the fuel delivery pipe 12 to the mounting member. Does not require an increase in

Other examples:
In the above embodiment, a fuel injection valve 11 (50, 60) is provided in the cylinder head 21 as the fuel injection device 10 so-called in-cylinder fuel injection device. The present invention can be similarly applied to a so-called port injection type fuel injection device provided in a port. In such a case, the fuel injection valve is fixed between the fuel delivery pipe and the intake port. In the case of the port injection type, in-cylinder pressure does not directly act on the fuel injection valve, so that the spring member 30 (61) having a weaker urging force may be used.

  In the above embodiment, the spring member 30 (61) has a substantially C-shaped cross-sectional view, but it goes without saying that it can take any shape as appropriate according to the position where the input portion is formed. For example, the input section may have a circular cross-sectional shape on the lower side or the upper side. Further, the spring member 30 (61) may be made of either metal or resin, and may be made of an elastic resin, a rubber material or the like in which the material itself having no spring shape has an elastic force.

  As described above, the fuel injection device for an internal combustion engine according to the present invention has been described based on some examples. However, the above-described embodiments of the present invention are for facilitating the understanding of the present invention. The invention is not limited. The present invention can be changed and improved without departing from the spirit and scope of the claims, and it is needless to say that the present invention includes equivalents thereof.

It is explanatory drawing which shows schematic structure of an internal combustion engine provided with the fuel-injection apparatus which concerns on a 1st Example. It is explanatory drawing which shows the fuel injection valve which comprises the fuel injection apparatus which concerns on a 1st Example. It is a top view which shows schematic structure of the fuel-injection apparatus which concerns on a 1st Example. It is explanatory drawing which shows the example of an assembly | attachment of a fuel injection valve and a fuel delivery pipe. It is explanatory drawing which shows the example of an assembly | attachment of the fuel injection valve which comprises the fuel-injection apparatus which concerns on a 1st Example with respect to a cylinder head. It is explanatory drawing which shows an example of the spring member before shaping | molding. It is explanatory drawing which shows the cross section which cut | disconnected the spring member by the surface perpendicular | vertical with respect to the axial direction. It is explanatory drawing which shows schematic structure of the fuel injection valve which comprises the fuel-injection apparatus for internal combustion engines which concerns on a 2nd Example. It is explanatory drawing which shows schematic structure of the fuel injection valve which comprises the fuel-injection apparatus for internal combustion engines which concerns on a 3rd Example. It is explanatory drawing which shows the fuel injection valve which comprises the fuel injection apparatus which concerns on a 4th Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10, 50, 60 ... Fuel injection apparatus 11 ... Fuel injection valve 11a, 50a ... Tip part 11b, 50b ... Main-body part 11c, 50c ... Connection part 111 ... Seal member 112 ... Flange part 113 ... Positioning part 114 ... Input part 115 ... Seal member 118 ... Heat insulation seal member 12 ... Fuel delivery pipe 121 ... Connection port 122 ... Fixing part 123 ... Positioning part 20 ... Internal combustion engine 21 ... Cylinder head 210 ... Main body assembly part 210a ... First assembly part 210b ... Second assembly Portion 211 ... Through-hole 212 ... Delivery pipe fixing portion 22 ... Cylinder 23 ... Cylinder block 24 ... Intake port 241 ... Intake valve 25 ... Exhaust port 251 ... Exhaust valve 26 ... Spark plug 30, 61 ... Spring member 31 ... Slit 32, 33 , 62, 63 ... positioning protrusion 35 ... opening 4 ... intermediate compression seal gasket IC ... intake side cam EC ... exhaust cam

Claims (8)

A fuel injection device for an internal combustion engine,
A shaft seal type fuel injection valve having a tip portion formed with an injection hole and a flange portion formed on the tip portion side and having a positioning portion, and maintaining airtightness between the tip portion and the internal combustion engine; ,
A fuel supply pipe fixed to the internal combustion engine and having a connection port to which the fuel injection valve is connected and a positioning portion ;
A spring member disposed between the fuel supply pipe and the flange portion of the fuel injection valve, and urges the fuel injection valve against the internal combustion engine, and engages with a positioning portion of the fuel supply pipe. A spring member having a first engagement portion and a second engagement portion engaged with a flange portion of the fuel injection valve ;
Each positioning part formed in the fuel supply pipe and the flange part of the fuel injection valve is offset from the axial center of the fuel injection valve toward the fixed position where the fuel supply pipe is fixed to the internal combustion engine. A fuel injection device for an internal combustion engine which is formed . A fuel injection device for an internal combustion engine,
A shaft seal type fuel injection valve having a tip portion formed with an injection hole and a flange portion having a positioning portion and maintaining airtightness between the tip portion and the internal combustion engine;
A fuel supply pipe fixed to the internal combustion engine and having a connection port to which the fuel injection valve is connected and a positioning portion ;
Wherein disposed between the fuel supply pipe and the flange portion of the fuel injection valve, a spring member for biasing the fuel injection valve with respect to the internal combustion engine to cover the outer periphery of the fuel injection valve, the fuel A spring member having a first engagement portion that engages with a positioning portion of a supply pipe and a second engagement portion that engages with a flange portion of the fuel injection valve ;
Each positioning part formed in the fuel supply pipe and the flange part of the fuel injection valve is offset from the axial center of the fuel injection valve toward the fixed position where the fuel supply pipe is fixed to the internal combustion engine. A fuel injection device for an internal combustion engine which is formed . A fuel injection device for an internal combustion engine,
Airtightness between the tip injection hole is formed, and the internal combustion engine at the distal end and having a flange portion having the front end portion to be formed positioning portion, an input unit drive current is inputted, the A shaft seal type fuel injection valve in which
A fuel supply pipe fixed to the internal combustion engine and having a connection port to which the fuel injection valve is connected and a positioning portion ;
An urging member that is disposed between the fuel supply pipe and a flange portion of the fuel injection valve and urges the fuel injection valve against the internal combustion engine, except for the input portion. a biasing member is a spring member of a cross-sectional view substantially C-shaped to cover the outer periphery of,
Each positioning part formed in the fuel supply pipe and the flange part of the fuel injection valve is offset from the axial center of the fuel injection valve toward the fixed position where the fuel supply pipe is fixed to the internal combustion engine. A fuel injection device for an internal combustion engine which is formed . A fuel injection device for an internal combustion engine,
A shaft seal type having a tip portion formed with an injection hole , a flange portion having a positioning portion, and an input portion to which a driving current is input and maintaining airtightness between the tip portion and the internal combustion engine A fuel injection valve,
A fuel supply pipe fixed to the internal combustion engine and having a connection port to which the fuel injection valve is connected and a positioning portion ;
An urging member that is disposed between the fuel supply pipe and a flange portion of the fuel injection valve, covers an outer periphery of the fuel injection valve, and urges the fuel injection valve with respect to the internal combustion engine ; An urging member , which is a spring member having a substantially C-shaped cross-sectional view covering the outer periphery of the fuel injection valve except for the input portion ;
Each positioning part formed in the fuel supply pipe and the flange part of the fuel injection valve is offset from the axial center of the fuel injection valve toward the fixed position where the fuel supply pipe is fixed to the internal combustion engine. A fuel injection device for an internal combustion engine which is formed . The fuel injection device for an internal combustion engine according to any one of claims 1 to 4,
The internal combustion engine has a cylinder block having a cylinder and a cylinder head, and the cylinder head has a through-hole for directly supplying fuel into the cylinder by exposing a tip portion of the fuel injection valve into the cylinder. Have
The fuel supply pipe is fixed to the cylinder head;
The fuel injection device for the internal combustion engine further includes:
A resin sealing material disposed at the tip of the fuel injection valve in order to maintain airtightness between the through hole of the cylinder head and the tip of the fuel injection valve;
A fuel injection device for an internal combustion engine, comprising: a heat insulating material disposed at a tip portion of the fuel injection valve inside a cylinder with respect to the resin seal material. The fuel injection device for an internal combustion engine according to any one of claims 1 to 4,
The fuel injection valve includes a connection part connected to a connection port of the fuel supply pipe, and a main body part having the tip part and the connection part at both ends,
The internal combustion engine includes a cylinder block having a cylinder, a cylinder head having a through-hole that guides a tip portion of the fuel injection valve into the cylinder, and a main body assembly portion to which the main body portion of the fuel injection valve is assembled,
The distance a between the outer peripheral surface of the connecting portion and the inner peripheral surface of the connection port, the distance b between the outer peripheral surface of the main body portion and the inner peripheral surface of the main body assembly portion, the outer peripheral surface of the tip portion, and the A fuel injection device for an internal combustion engine in which a relationship of a> b and c> b is established between the distance c from the inner peripheral surface of the through hole. A fuel injection device for an internal combustion engine,
  A shaft seal type fuel injection valve having a tip portion formed with an injection hole and a flange portion formed on the tip portion side, and maintaining airtightness between the tip portion and the internal combustion engine;
  A fuel supply pipe fixed to the internal combustion engine and having a connection port to which the fuel injection valve is connected;
  A plurality of slits parallel to the flange portion of the fuel injection valve are arranged between the fuel supply pipe and the flange portion of the fuel injection valve so as to cover the outer periphery of the fuel injection valve, and engage with the fuel supply pipe And a spring member having a plurality of second engaging portions that are engaged with the flange portion of the fuel injection valve and are offset with respect to the first engaging portion. A fuel injection device for an internal combustion engine. A fuel injection device for an internal combustion engine,
A shaft seal type fuel injection valve having a tip portion formed with an injection hole and a flange portion and maintaining airtightness between the tip portion and the internal combustion engine;
A fuel supply pipe fixed to the internal combustion engine and having a connection port to which the fuel injection valve is connected;
The fuel injection pipe is disposed between the fuel supply pipe and the flange of the fuel injection valve so as to cover the outer periphery of the fuel injection valve, covers the outer periphery of the fuel injection valve, and attaches the fuel injection valve to the internal combustion engine. A plurality of slits parallel to the flange portion of the fuel injection valve; a first engagement portion that engages with the fuel supply pipe; and a flange portion of the fuel injection valve. A fuel injection device for an internal combustion engine, comprising: a spring member having a plurality of second engaging portions offset with respect to the first engaging portion .

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