JP2005291136A - Fuel supplying device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel supplying device which allows achievement of expansion of the filtration area of a filter which is used to prevent foreign matters from invading a fuel injection device which supplies fuel to an internal combustion engine. <P>SOLUTION: The fuel supplying device comprises a fuel distribution pipe 8 having distribution outlets 82a and 82b for distributing fuel to the cylinder of the internal combustion engine, and a fuel injection valve 2 which is mounted by inserting a fuel flow inlet portion 48 into the distribution outlets 82a and 82b to inject fuel which is supplied through the distribution outlets 82a and 82b into the cylinder. On the circumference of the fuel flow inlet portion 48, a filter member 70 is provided which captures the foreign matters contained in the fuel supplied through the distribution outlets 82a and 82b. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a fuel supply device, and is suitable for application to a fuel supply device that supplies fuel to each cylinder of an internal combustion engine from a fuel injection device (hereinafter referred to as an injector) assembled in a fuel distribution pipe, for example.

  2. Description of the Related Art Conventionally, there has been known a fuel supply device in which an inlet port of an injector is inserted into a plurality of distribution ports of a fuel distribution pipe that distributes fuel to each cylinder of an internal combustion engine, and fuel is supplied from each injector to each cylinder (patent) Reference 1 etc.). Also, this type of injector is known in which a filter is disposed in an internal fuel passage formed from the inner periphery of the inlet portion (see, for example, Patent Document 2). A nozzle portion that shuts off and allows fuel injection by closing and opening the valve is provided downstream of the internal fuel passage in the injector.

In the disclosed technology such as Patent Document 2, a filter is provided in the internal fuel passage on the inflow port side, thereby preventing the sheet portion of the nozzle portion from being damaged by foreign matter.
JP 2000-240530 A JP-A-11-264360

  However, in the conventional configuration, the size of the filter is limited, and the filtration area cannot be increased. When the fuel supply device is actually manufactured, in order to improve the cleanliness of the parts that supply the fuel to the injector, a great amount of man-hours are required to clean the fuel distribution pipe, which increases the cost of the fuel supply device. There is a problem.

  In addition, for example, when exporting to a destination where the fueling environment supplied as a fuel is different, there are some destination countries where the fuel contains a relatively large amount of fine foreign matter due to various circumstances such as fuel management. May become clogged or unable to be filtered. In some cases, a filter cannot capture a large amount of fine foreign matter, but it flows into the nozzle part and damages the sheet part, which may reduce the oil-tight function for blocking fuel injection in the nozzle part. .

  The present invention has been made in consideration of such circumstances, and it is possible to increase the filtration area of a filter for preventing foreign matter from entering a fuel injection device that injects and supplies fuel to an internal combustion engine. Objective.

  Another object is to increase the filtration area of the filter for preventing foreign matter from entering the fuel injection device that injects and supplies the fuel to the internal combustion engine, and to inject fuel in the fuel injection device. An object of the present invention is to provide a fuel supply device capable of preventing the oil-tight function of the nozzle portion that blocks and allows the oil from being lowered.

  According to claim 1 of the present invention, the fuel distribution pipe having a distribution port for distributing fuel to the cylinders of the internal combustion engine, and the fuel supplied through the distribution port are assembled by inserting the fuel inlet portion into the distribution port. And a fuel injection valve that injects into the cylinder, and a filter member that captures foreign matter contained in the fuel supplied from the distribution port is provided on the outer periphery of the fuel inlet.

  According to this, in a fuel supply apparatus that includes a fuel distribution pipe having a distribution port and a fuel injection valve having a fuel inlet, and injects fuel to the internal combustion engine via the distribution port and the fuel inlet. Since the filter member is provided on the outer periphery of the fuel inlet portion of the fuel injection valve, the size of the filter member can be at least larger than the outer periphery of the fuel inlet portion. Therefore, the filtration area in the filter member can be increased as compared with the conventional technology in which the filter member is disposed in the fuel passage formed in the inner periphery of the fuel inlet portion.

  According to a second aspect of the present invention, the filter member has a filter medium and a holding member for holding the filter medium, and the fuel inlet port portion and the distribution port are movably moved along the outer periphery of the fuel inlet port portion. An O-ring for oil-tightness of the fuel path between the O-ring and the holding member serves as a retaining member for the O-ring.

  According to this, an O-ring for oil tightness of the fuel path between the fuel inlet and the distribution port is attached to the fuel inlet. Further, the filter member provided on the outer periphery of the fuel inlet portion includes a filter medium and a holding member that holds the filter medium. Therefore, the holding member can move the filter member along the outer periphery of the fuel inlet portion. The ring can be prevented from coming off.

  According to claim 3 of the present invention, the filter member is attached to the distribution port.

  According to this, since the filter member is attached to the distribution port, the filtration area of the filter member is not limited to the size of the fuel inlet portion. Therefore, the filtration area of the filter member can be expanded at least in the range of the size of the distribution port into which the fuel inflow portion is inserted.

  According to claim 4 of the present invention, the fuel distribution pipe having the distribution port for distributing the fuel to the cylinders of the internal combustion engine, and the fuel supplied through the distribution port are assembled by inserting the fuel inlet port into the distribution port. A fuel injection valve that injects into the cylinder, and a filter member that captures foreign matter contained in the fuel flowing out from the distribution port toward the fuel inflow port is attached to the distribution port. To do.

  According to this, in a fuel supply apparatus that includes a fuel distribution pipe having a distribution port and a fuel injection valve having a fuel inlet, and injects fuel to the internal combustion engine via the distribution port and the fuel inlet. Since the filter member is attached to the distribution port of the fuel distribution pipe, the size of the filter member can be increased to at least the range of the size of the distribution port into which the fuel inlet port is inserted. Therefore, the filtration area in the filter member can be increased as compared with the conventional technology in which the filter member is disposed in the fuel passage formed in the inner periphery of the fuel inlet portion.

  According to claim 5 of the present invention, the fuel passage formed in the inner periphery of the fuel inlet portion has a second filter member that captures foreign matters contained in the fuel. .

  According to this, in the fuel supply device according to claim 3 or 4, since the second filter member is provided in the fuel passage in the fuel inlet portion separately from the filter member attached to the distribution port. Foreign matter contained in the fuel can be filtered by either the member or the second filter member. Therefore, the overall filtration efficiency of the filter member and the second filter member can be improved.

  In addition, for example, by changing the size of the mesh of the filter medium between the filter member and the second filter member and reducing the size of the mesh on the second filter member side, the size of the foreign matter is relatively fine. And the filtration area can be increased by at least the filtration area of the filter member. Therefore, it is possible to prevent the oil tight function for blocking the fuel injection of the fuel injection valve by the foreign matter that has entered the fuel passage in the fuel injection valve from being deteriorated.

  According to a sixth aspect of the present invention, an internal fuel passage that includes a fuel inlet portion that guides fuel supplied from the outside and a nozzle portion that blocks and allows fuel injection, and connects the fuel inlet portion and the nozzle portion. In the fuel injection valve for supplying fuel from the nozzle portion to the internal combustion engine, a filter member that captures foreign matters contained in the fuel is attached to the outer periphery of the fuel inlet portion.

  According to this, since the filter member is attached to the outer periphery instead of the inner periphery of the fuel inlet portion, the filtration area can be increased as compared with the prior art.

  Hereinafter, embodiments in which the fuel supply device of the present invention is embodied by applying the fuel supply device to a fuel supply to a gasoline engine will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing a fuel supply device of the present embodiment. FIG. 2 is a plan view of the filter member in FIG. FIG. 3 is an enlarged cross-sectional view showing the configuration of one embodiment of the fuel injection valve in FIG. FIG. 10 is a schematic diagram showing a schematic configuration of an internal combustion engine equipped with the fuel supply device of the present embodiment.

  As shown in FIG. 1, the fuel supply device 1 includes a fuel distribution pipe 8, a fuel injection valve (hereinafter referred to as an injector) 2 as a fuel injection device, and a filter member 70. The injector 2 is provided in each cylinder of a multi-cylinder (for example, four cylinders) internal combustion engine (hereinafter referred to as an engine) and is assembled to the fuel distribution pipe 8 to inject and supply fuel to each cylinder. Generally, fuel in a fuel tank (not shown) is sucked and discharged to the fuel distribution pipe 8 by a fuel pump (not shown), and the discharged fuel is guided. The discharged fuel is regulated to a predetermined pressure by a pressure regulating device such as a pressure regulator (not shown) and sent to the fuel distribution pipe 8. When the engine is a direct injection engine, the pressure of the fuel supplied to the combustion chamber 106 of the internal combustion engine is about 2 Mpa or more, so that the fuel pump 3 sucked up from the fuel tank as shown in FIG. A predetermined low-pressure (for example, 0.2 Mpa) fuel is pressurized by the high-pressure pump 5, and the pressurized predetermined high-pressure fuel (for example, a predetermined fuel in the range of 2 to 13 Mpa) is supplied to the fuel distribution pipe 8. Has been. The fuel discharged from the fuel pump 3 and the fuel supplied from the high-pressure pump 5 to the fuel distribution pipe 8 are regulated to predetermined pressures by the pressure regulators 4 and 9, respectively. Hereinafter, the engine described in this embodiment is a gasoline direct injection engine.

  As shown in FIG. 1, the fuel distribution pipe 8 includes a communication pipe 81 having a fuel passage 81 a extending in a longitudinal direction (substantially perpendicular to the paper surface of FIG. 1), and a communication pipe 81 that intersects the communication pipe 21. A connecting pipe (hereinafter referred to as a cup) 82 that opens is configured. As shown in FIG. 2, the communication pipe 81 is formed in a substantially rectangular cross section and extends in the side-by-side direction of each cylinder. The cross-sectional shape may be substantially circular. The connecting pipe 81 is formed of a metal material on the outer wall that forms the fuel passage 81a therein, and even if it is a steel pipe that extends, for example, a pipe that is divided into two parts in the vertical direction is joined and integrated. It may be a thing. The fuel passage 21a constitutes a transport path for transporting fuel at a predetermined pressure. An opening (hereinafter referred to as a cup opening) 82a of the cup 22 is opened in the transport path. The cup 82 is formed in a substantially cylindrical shape or a substantially cup shape protruding from the outer wall of the communication pipe 82. A fuel passage 81a communicates with an inner hole (hereinafter referred to as an accommodation hole) 82b formed in the cup 82 through a cup opening 82a. The cup opening 82 a and the accommodation hole 82 b constitute a distribution port that supplies fuel to the injector 2 from the fuel distribution pipe 8. The cup opening 82 a is an opening end that opens to the fuel passage 81 a of the fuel distribution pipe 8, and the accommodation hole 82 b is a fuel downstream end of the fuel distribution pipe 8. In addition, the size of the inner periphery of the cup opening 82a and the accommodation hole 82b may be the same size or different sizes. Hereinafter, the sizes of the inner peripheries of the cup opening 82a and the accommodation hole 82b described in the present embodiment are the same.

  As shown in FIG. 1, the injector 2 has a fuel inlet 48 through which fuel flows, and the fuel inlet 48 is inserted into the fuel distribution pipe 8 (specifically, a cup 82) and assembled. The fuel is supplied through the cup 82. Specifically, the fuel inlet 48 is formed in a substantially cylindrical shape, and an inner hole formed in the fuel inlet 48 is in communication with a fuel passage in the injector 30. The fuel inflow port portion 48 is inserted substantially coaxially into the accommodation hole 82b of the cup 82, and is movable in the axial direction. In a state where the fuel inlet 48 is inserted into the cup 82, the space between the fuel inlet 48 and the accommodation hole 82b is sealed with an O-ring 91 as a seal member, and the inner hole communicates with the cup opening 82a. The fuel in the fuel distribution pipe 80 flows into the fuel passage through the cup 82 and the fuel inlet 48. The backup ring 92 is arranged so as to sandwich the O-ring 91 in the vertical direction. Further, the injector 2 is an electric drive type, and as shown in FIG. 1, is provided with a nozzle portion B for blocking and permitting fuel injection, and the fuel flowing into the fuel passage is transferred from the nozzle portion B to the engine cylinder. Spray. In detail, as shown in the injector 2 of one embodiment of FIG. 3, the valve body 12 is fixed to the inner wall of the fuel injection side end portion of the valve housing 16 by welding. The valve body 12 has a conical surface 13 as an inner peripheral surface that decreases in diameter toward the nozzle hole 21 side in the fuel flow direction. A nozzle needle 30 as a valve member can be separated from and seated on the conical surface 13. Here, the conical surface 13 constitutes a valve seat 14 on which the nozzle needle 30 can be separated and seated. Specifically, the contact portion 31 of the nozzle needle 30 is separated from and seated on the valve seat 14. The valve body 12 is formed in a substantially bottomed cylindrical shape with a step, and is inserted into the inner peripheral side of the lower end portion of the valve housing 16. The outer periphery of the valve body 12 is reduced in diameter toward the bottom with a step as a boundary. The stepped portion contacts the step formed on the inner peripheral side of the valve housing 16, thereby preventing the valve body 12 from dropping from the valve housing 16 due to fuel pressure. On the central side of the valve seat 14, an injection hole 21 that can communicate with the fuel passage is disposed toward the downstream side of the fuel flow of the valve seat 14. The size of the nozzle hole 21, the direction of the nozzle hole axis, the nozzle hole arrangement, and the like are determined in accordance with the required fuel spray shape, direction, number, and the like. The opening area of the nozzle hole defines the flow rate when the valve is opened. Therefore, the fuel injection amount of the injector 2 is measured by the opening area of the injection hole and the valve opening period. When the nozzle needle 30 is seated on the valve seat 14, fuel injection from the nozzle hole 21 is cut off, and when the nozzle needle 30 is separated from the valve seat 14, fuel injection from the nozzle hole 21 is allowed and fuel is injected. The cylindrical member 40 is inserted into the inner peripheral wall of the valve housing 16 on the side opposite to the injection hole, and is fixed to the valve housing 16 by welding. The cylindrical member 40 includes a first magnetic cylinder portion 42, a nonmagnetic cylinder portion 44, and a second magnetic cylinder portion 46 from the nozzle hole 21 side. The nonmagnetic cylinder portion 44 prevents a magnetic short circuit between the first magnetic cylinder portion 42 and the second magnetic cylinder portion 46. By preventing this magnetic short circuit, the magnetic flux generated by the electromagnetic force generated by energization of the coil 60 efficiently flows to the armature 50 and the attraction member 54. A movable core (hereinafter referred to as an armature) 50 is formed of a magnetic material in a substantially cylindrical shape, and is fixed to the end 34 of the nozzle needle 30 on the side opposite to the injection hole by welding. The armature 50 reciprocates with the nozzle needle 30. An outflow hole 52 that penetrates the cylinder wall of the armature 50 forms a fuel passage that communicates the inside and outside of the cylinder of the armature 50. The fixed core (hereinafter referred to as a suction member) 54 is made of a magnetic material and has a substantially cylindrical shape. The suction member 54 is inserted into the cylindrical member 40 and is fixed to the cylindrical member 40 by welding. The suction member 54 is installed on the side opposite to the nozzle hole with respect to the armature 50 and faces the armature 50. The adjusting pipe 56 is press-fitted into the inner periphery of the suction member 54 and forms a fuel passage therein. The spring 58 is locked to the adjusting pipe 56 at one end and is locked to the armature 50 at the other end. By adjusting the press-fitting amount of the adjusting pipe 56, the load of the spring 58 biased to the armature 50 is changed. The armature 50 and the nozzle needle 30 are biased toward the valve seat 14 by the biasing force of the spring 58. The coil 60 is wound around a spool 62. The terminal 65 is insert-molded in the connector 64 and is electrically connected to the coil 60. When the coil 60 is energized, a magnetic attraction force acts between the armature 50 and the attraction member 54, and the armature 50 is attracted toward the attraction member 54 against the biasing force of the spring 58.

  Here, the valve body 12 and the nozzle needle 30 constitute a nozzle portion B that blocks and allows fuel injection. In the nozzle part B, the valve seat 14 and the contact part 31 constitute a seat part. The valve body 12 (specifically, the nozzle hole 21) constitutes a fuel spray forming means for atomizing the fuel and forming a spray. The coil 60, the armature 50, the suction member 54, the tubular member 40, and the spring 58 constitute an electromagnetic drive unit S that drives the nozzle portion B. The injector 2 having the above-described configuration controls the lift of the nozzle needle 30 by controlling the current supplied from the connector 64 to the coil, and injects the fuel flowing into the fuel passage from the nozzle portion B into the engine cylinder. When the current supply to the coil is stopped, the injector 30 has a spring that urges the nozzle needle in the seating direction, and the nozzle portion 33 closes to terminate the injection.

  As illustrated in FIGS. 1 and 2, the filter 70 includes a filter medium 71 and a holding member 72 that holds the filter medium 71. The filter medium 71 is formed of a wire mesh in a substantially cylindrical shape, the holding member 72 is formed of a resin material, and the filter medium 71 is formed by insert molding. The upper end portion side of the holding member 72 is integrally formed with the filter medium 71, and the lower end portion side is fitted and fixed to the outer periphery of the fuel inlet portion 48. The outer periphery of the filter member 70 is formed in a size that can be inserted into the accommodation hole 82b. The filter member 70 is inserted into the accommodation hole 82b and assembled together with the fuel inlet 48. The filter medium 71 is formed in a predetermined mesh size. Foreign matter contained in the fuel supplied to the injector 10 is removed. The filter member 70 is provided between the connecting pipe 82 (specifically, the distribution ports 82 a and 82 b) and the fuel inflow portion 48, is installed on the fuel upstream side of the fuel inflow portion 48, and is supplied to the injector 10. Foreign matter contained in the fuel is removed. The fuel that has flowed in through the inner hole of the fuel inlet 48 is a fuel passage in the suction member 54, a fuel passage in the adjusting pipe 56, a fuel passage in the armature 50, an outflow hole 52, an inner peripheral wall of the valve housing 16, and a nozzle. It passes sequentially between the outer peripheral walls of the needle 30. Further, the fuel passes through an opening passage formed between the contact portion 31 and the valve seat 14 in accordance with the lift of the nozzle needle 30 and is guided to the injection hole 21.

  Next, the operation of the fuel supply device 1 of the present embodiment having the above-described configuration will be described. When the vehicle engine key is set to the IG position and an ignition switch (not shown) is turned on, the fuel pump 3 is driven, and the fuel is sucked up into the fuel tank by the fuel pump 3. The sucked-up fuel is regulated by the pressure regulator 4 and a predetermined low-pressure fuel is supplied to the high-pressure pump 5. The predetermined low pressure fuel is pressurized by the high pressure pump 5, and the pressurized fuel is supplied to the fuel distribution pipe 8. The fuel supplied to the fuel distribution pipe 8 is adjusted to a predetermined high-pressure fuel by the pressure regulator 4 and supplied to the injector 2 from the respective distribution ports 82 a and 82 b in the fuel distribution pipe 20. When the injector 2 is opened, current is supplied to the coil 60 of the injector 2 to control the lift of the nozzle needle 30. When the nozzle needle 30 starts to lift, the nozzle part B is opened and fuel is supplied to the engine. On the other hand, when the injector 2 is closed, the supply to the coil 60 is stopped, and the lift of the nozzle needle 30 is reduced by the spring 58. Then, when the nozzle needle 30 is seated, the injection is finished.

  Next, the operation and effect of the present embodiment will be described. (1) The cup opening 82a and the accommodation hole 82b, that is, the fuel distribution pipe 8 having a distribution port, and the injector 2 having a fuel inflow port 48 are provided. In the fuel supply device 1 for injecting and supplying fuel to the internal combustion engine via the ports 82a and 82b and the fuel inlet 48, the filter member 70 is provided on the outer periphery of the fuel inlet 48 of the injector 2. The size of the member 70 can be at least larger than the size of the outer periphery of the fuel inlet 48. Therefore, the filtration area in the filter member 70 can be increased as compared with the conventional technology in which the filter member 970 is disposed in the fuel passage in the fuel inlet 48.

  A comparative example in which the arrangement configuration of the filter member 970 of the prior art is applied to the injector 2 of the embodiment shown in FIG. 3 is shown in FIG. As shown in FIG. 11, the size of the filter member 970 is formed in the fuel inflow port portion 48 and is limited to the size of the inner periphery that accommodates the filter member 970, and cannot be formed large.

  (2) Further, in the comparative example to which the prior art is applied, a resin-made material is formed on the front end side of the fuel inflow portion 48 in order to prevent the O-ring 91 that can move along the outer periphery of the fuel inflow portion 48. A ring 48a is provided (see FIG. 11). On the other hand, in the present embodiment, the holding member 72 of the filter member 70 is fitted and fixed to the outer periphery of the fuel inlet portion 48, so that the holding member 72 moves along the outer periphery of the fuel inlet portion 48. It is possible to prevent the O-ring 91 from being detached.

  (3) Compared to the conventional technology in which the filter member is provided inside the fuel inflow port portion 48, in the present embodiment, it is provided outside the fuel inflow port portion 48, so that it is easy to secure the filtration area. For this reason, even when the size of the mesh of the filter medium 71 of the filter member 70 is reduced in the case where it is desired to capture the size of the foreign matter contained in the fuel, even finer than conventional ones, the filter member 70 ( Specifically, the area of the filter medium 71) can be increased to ensure the filtration area.

(Second Embodiment)
Hereinafter, other embodiments to which the present invention is applied will be described. In the following embodiments, the same or equivalent components as those in the first embodiment are denoted by the same reference numerals, and description thereof will not be repeated.

  In the second embodiment, as shown in FIG. 4, the filter member 170 is attached to the accommodation hole 82b. FIG. 4 is a cross-sectional view showing the fuel supply device of the present embodiment. FIG. 5 is a plan view of the filter member in FIG.

  As shown in FIGS. 4 and 5, the filter member 170 is formed in a flat plate shape, and the holding member 172 holds the outer peripheral side of the thin plate-shaped filter medium 171. The holding member 172 is provided with ribs such as a cross shape as shown in FIG. The filter member 170 is disposed in a substantially radial direction of the accommodation hole 82b.

  Note that a filter member 970 is disposed in the inner hole of the fuel inlet 48 as the second filter member.

  Next, the operation and effect of this embodiment will be described. (1) Since the filter member 170 is attached to the accommodation hole 82a, that is, the distribution port, the size of the filter member 170 is inserted at least the fuel inlet 48. It is possible to increase the size of the accommodation hole 82b. Therefore, it is possible to increase the filtration area of the filter member 170 as compared with the conventional technology in which the filter member 970 is disposed in the fuel passage inside the fuel inlet portion.

  (2) Furthermore, in this embodiment, since the filter member 970 is disposed in the inner hole of the fuel inlet 48 as the second filter member, either the filter member 170 or the second filter member 970 is used. Foreign matter contained in fuel can be filtered. Therefore, the overall filtration efficiency of the filter member 170 and the second filter member 970 can be improved.

  (3) Furthermore, by changing the size of the mesh of the filter media 171 and 971 between the filter member 170 and the second filter member 970, for example, by reducing the size of the mesh on the second filter member 970 side, A foreign matter can be captured up to a relatively fine size, and at least the filtration area of the filter member 170 can be increased. Therefore, it is possible to prevent the oil tight function for blocking the fuel injection in the nozzle portion B due to the foreign matter that has entered the fuel passage in the injector 2 from being deteriorated.

(Third embodiment)
In the third embodiment, instead of the filter member 170 attached to the accommodation hole 82b described in the second embodiment, as shown in FIG. 6, a filter member 270 attached to the cup opening 82a side is used. . FIG. 6 is a cross-sectional view showing the fuel supply device of the present embodiment.

  As shown in FIG. 6, the cup opening 82a is formed smaller than the accommodation hole 82b. The filter member 271 includes a filter medium 271 and a holding member 272 that holds the filter medium 271. The filter medium 271 is formed of a wire mesh in a substantially cylindrical shape, and the holding member 272 includes a ring-shaped metal part. 271 is fixed in a substantially cylindrical shape. The filter member 270 is fixed to the cup opening 82a, that is, the distribution port by fitting the holding member 272 into the cup opening 82a. The substantially cylindrical filter medium 271 is formed to be larger than the size of the outer periphery of the fuel inlet 48.

  The cup opening 82 a is formed to be at least larger than the size of the inner hole of the fuel inlet 48. For this reason, compared with what is arrange | positioned in the internal hole of the fuel inflow port part 48 of a prior art, the magnitude | size of the filter member 270 can be formed large, and the expansion of a filtration area can be aimed at.

  Even when a metal material that is relatively harder than the resin material is used as the material of the holding member 272, the housing hole 82b used as the sealing surface of the O-ring 91 and the filter member 270 are fixed for fitting. Since the size of the inner peripheral surface of the cup opening 82a used as the inner periphery is made different, the sealing surface of the O-ring 91 is not damaged when the filter member 270 is fitted and assembled.

  Note that even when the inner periphery of the cup opening 82a is roughened due to the fitting insertion when the metal holding member 272 is inserted into the cup opening and fixed, it is shown in FIG. As described above, the filter member 270 is inserted and fitted into the cup opening 82a from the upstream side of the fuel so that the foreign matter generated in the rough surface portion is on the upstream side of the filter medium 271. 48 can be avoided.

  Furthermore, since the filter member 270 of this embodiment is substantially cylindrical compared to the flat plate-like filter member 170 described in the second embodiment, the filtration area (specifically, the filter medium area of the developed filter medium) is reduced. Since it can be formed large, for example, it is easy to ensure an increase in the required filtration area.

(Fourth embodiment)
In the fourth embodiment, the material of the holding member of the filter member is replaced with the metal material in the holding member 272 of the third embodiment, and the holding member 372 is made of a resin material as shown in FIG. . FIG. 7 is a cross-sectional view showing the fuel supply device of the present embodiment. FIG. 8 is a plan view of the filter member in FIG.

  Since the material of the holding member 372 is a resin material, the degree of freedom of the shape in which the holding member can be formed can be improved as compared with a metal material. For example, since the rib shape for holding the filter medium 371 as shown in FIGS. 7 and 8 is a bent shape and can be formed, it is possible to make the shape of the filter medium 371 advantageous for increasing the filter area. .

  Furthermore, since the resin holding member 372 can be smoothly inserted and fixed to the inner peripheral surface of the cup opening 82a when being fitted and fixed as compared with a metal one, the surface roughness of the inner peripheral surface due to the fitting can be prevented. it can. Furthermore, since there is no fear of surface roughness of the inner peripheral surface due to fitting, the insertion direction when inserting and holding the holding member 272 into the cup opening is fixed even when inserting in the fuel downstream direction. As shown in FIG. 7, it may be the case where it is inserted toward the fuel upstream direction.

(Fifth embodiment)
In the ninth embodiment, the material of the holding member of the filter member is a metal holding member 472 as shown in FIG. 9 instead of the resin holding member 72 of the first embodiment. FIG. 9 is a cross-sectional view showing the fuel supply device of this embodiment.

  As shown in FIG. 9, since the filter member 470 is attached to the outer periphery of the fuel inlet 48, the state in which the filter member 470 is attached to the injector 2 is the same as that of the conventional injector 2. It can be in a completed state. Even in such a configuration, the filter member 470 is attached to the outer periphery of the fuel inflow port portion 48, so that the filtration area can be increased as compared with the prior art.

(Other embodiments)
In the present embodiment described above, the filter member 70 has been described in the first embodiment as being fitted to the outer periphery of the fuel inlet portion 48. However, the filter member 70 is fitted and assembled to the inner periphery of the accommodation hole 82b. It may be. Specifically, for example, instead of the inner periphery of the holding member 72 on the lower end portion side that can be fitted to the outer periphery of the fuel inlet portion 48, the outer periphery on the lower end portion side is fitted to the inner periphery of the accommodation hole 82b. Be possible.

  In the present embodiment described above, the fuel supply device 1 including the direct injection engine injector 2 and the fuel distribution pipe 8 has been described. However, the fuel supply device 1 is not limited to the one that directly injects and supplies fuel to the combustion chamber 106 as in the direct injection engine. Instead, it may be injected indirectly into the combustion chamber by being injected into the intake pipe or the like. In recent years, there has been an increasing demand for a large flow rate for the fuel supply device 1, particularly the injector 2, for the purpose of improving fuel consumption and reducing exhaust gas. By applying this embodiment, the filtration area of the filter member can be increased, which is advantageous for increasing the flow rate.

  In the present embodiment described above, the injector 2 having the nozzle part B having the oil tight function has been described. However, even if the valve body 12 constituting the nozzle part B does not have the spray forming means, the oil tight function is provided. The injector 2 which has the nozzle part B which has and the nozzle hole plate 20 which has a spray formation means may be sufficient. The nozzle hole plate is formed in a substantially bottomed cylindrical shape and is sandwiched between the bottom inner wall of the valve housing 16 and the bottom inner wall of the valve body 12. A plurality of nozzle holes 21 are arranged in the nozzle hole plate. The nozzle plate constitutes a fuel spray forming means for atomizing the fuel and forming a spray.

  In the present embodiment described above, the injector 2 has been described as an electrically driven type. However, the injector 2 is not limited to the one in which the nozzle portion B is opened and closed by the electromagnetic force of the coil 60, and a piezoelectric ceramic layer such as PZT and the like. The nozzle portion B may be opened and closed by driving the nozzle needle by the expansion and contraction force of a piezo stack having a capacitor structure in which electrode layers are alternately stacked.

It is sectional drawing which shows the fuel supply apparatus of embodiment of this invention. It is the top view which looked at the filter member in FIG. It is an expanded sectional view which shows the structure of one Example of the fuel injection valve in FIG. It is sectional drawing which shows the fuel supply apparatus of 2nd Embodiment. It is the top view which looked at the filter member in FIG. It is sectional drawing which shows the fuel supply apparatus of 3rd Embodiment. It is sectional drawing which shows the fuel supply apparatus of 4th Embodiment. It is the top view which looked at the filter member in FIG. It is sectional drawing which shows the fuel supply apparatus of 5th Embodiment. It is a mimetic diagram showing a schematic structure of an internal-combustion engine carrying a fuel supply device of the present invention. It is sectional drawing which shows the fuel supply apparatus of a comparative example.

Explanation of symbols

1 Fuel supply device 2 Injector (fuel injection valve, fuel supply device)
B Nozzle part 12 Valve body 14 Valve seat 30 Nozzle needle (valve member)
31 Contact portion 48 Fuel inlet portion 70 Filter member 71 Filter medium 72 Holding member 8 Fuel distribution pipe 81 Communication pipe 81a Fuel passage (conveyance path)
82 cup (connecting pipe)
82a Cup opening (distribution port)
82b Accommodation hole (distribution port)
91 O-ring

Claims (6)

A fuel distribution pipe having a distribution port for distributing fuel to the cylinders of the internal combustion engine;
A fuel injection valve that is assembled by inserting a fuel inflow port into the distribution port, and injects fuel supplied through the distribution port into the cylinder;
A fuel supply device, wherein a filter member that captures foreign matters contained in the fuel supplied from the distribution port is provided on an outer periphery of the fuel inlet portion. The filter member has a filter medium and a holding member that holds the filter medium,
The fuel inlet portion is provided with an O-ring for oil tightness of the fuel path between the fuel inlet portion and the distribution port, so as to be movable along the outer periphery.
The fuel supply device according to claim 1, wherein the holding member also serves to prevent the O-ring from coming off. The fuel supply device according to claim 1, wherein the filter member is attached to the distribution port. A fuel distribution pipe having a distribution port for distributing fuel to the cylinders of the internal combustion engine;
A fuel injection valve that is assembled by inserting a fuel inflow port into the distribution port, and injects fuel supplied through the distribution port into the cylinder;
The fuel supply apparatus according to claim 1, wherein a filter member that captures foreign matter contained in the fuel flowing out from the distribution port toward the fuel inlet is attached to the distribution port. The fuel passage formed in the inner periphery of the fuel inlet portion has a second filter member that captures foreign matters contained in the fuel. The fuel supply apparatus as described. A fuel inlet portion for guiding fuel supplied from the outside, and a nozzle portion for blocking and allowing fuel injection; In a fuel injection valve that injects and supplies fuel to an engine,
A fuel injection valve, wherein a filter member for capturing foreign matter contained in the fuel is attached to the outer periphery of the fuel inlet portion.

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