JP4118216B2 - Fuel injection device - Google Patents

Description

  The present invention relates to a fuel injection device.

  As a fuel injection device, for example, a fuel injection valve that directly or indirectly injects fuel into a combustion chamber of an internal combustion engine is known. The fuel supplied from this type of fuel injection valve is mixed with air in the combustion chamber or the intake pipe to form a combustible mixture in the combustion chamber. The air-fuel mixture in the combustion chamber is compressed by piston motion, and then ignited and combusted by an ignition device, and is used as power for the internal combustion engine.

  In recent years, exhaust gas regulations for vehicles and the like have been strengthened. In order to reduce toxic components contained in the exhaust gas, it is important to atomize the fuel spray injected from the fuel injection valve. In order to atomize the fuel spray, it is effective as a technique for reducing toxic components contained in the exhaust gas by injecting heated fuel and causing atomization under reduced pressure and the like (Patent Document 1, etc.) .

Patent Document 1 discloses a technique for improving atomization by incorporating a fuel heating heater inside a fuel injection valve.
Special Table 2000-508041

  However, none of the above prior art discloses an invention using a winding heater as a fuel heating heater and an invention relating to a fixing (mounting) method when the winding heater is built in a fuel injection valve. In the winding heater, there is a concern that a short circuit between lines or a short circuit due to contact between the winding and a metal member disposed around the winding may occur due to thermal deformation of the winding itself during heating of the heater or behavior of the winding during injection. When these short circuits occur, an abnormal overheating state is caused, causing the wire heater to be disconnected, resulting in a malfunction as a heating injection valve.

  The present invention has been made in view of such circumstances, and an object thereof is to incorporate a winding heater in a fuel injection valve and to atomize the fuel by heating it.

  Another object of the present invention is to provide a fuel injection device in which a winding heater is built in a fuel injection valve to improve the reliability related to fuel heating.

According to Claims 1 and 2 of the present invention, a valve body which forms a fuel passage and has a valve seat on the downstream side of the fuel passage, and a valve member which is accommodated in the fuel passage so as to reciprocate and can be seated on the valve seat; And a winding heater provided in the fuel passage and wound around the outer periphery of the valve member.

  According to this, the winding heater which winds the outer periphery of the valve member accommodated so that a reciprocation is possible is installed in the fuel passage formed in the valve body, or the upstream of the fuel passage. Therefore, the winding heater can be disposed in the fuel around the valve member to directly heat the fuel. Furthermore, the effective heating area can be increased according to the number of turns of the winding heater wound around the outer periphery of the valve member.

According to Claims 1 and 2 of the present invention, the insulating member for holding the winding heater is provided.

  According to this, since it has an insulating member that holds the winding heater, it is short-circuited between the windings due to thermal deformation of the winding heater due to self-heating or vibration during fuel injection operation, or the winding and surrounding metal members It is possible to prevent a short circuit due to contact with.

According to claim 1 of the present invention, the insulating member, together with the clamp the upstream end of the winding heater and the downstream end, only the upstream end and the downstream end portion of the outer peripheral surface of the winding heater The winding heater is held by sliding contact, and the winding heater is exposed in the inner and outer fuel paths of the winding heater .

According to this, since the insulating member holding the winding heater is held only at the upstream end and the downstream end of the outer peripheral surface of the winding heater, the inside and outside of the winding heater can be almost exposed. Therefore, it is possible to heat and raise the fuel in the inner peripheral fuel path and the outer peripheral fuel path across the windings to a substantially uniform temperature. Therefore, since the fuel heated and raised to a substantially uniform temperature is injected from the fuel injection valve, the injected fuel (fuel spray) is atomized uniformly.

According to the second aspect of the present invention, the insulating member that holds the inner peripheral surface of the winding heater opens to the inner peripheral side and the outer peripheral side, and the upstream end and the downstream end of the winding heater. A window having a length extending over the inner periphery is provided, and the winding heater is exposed in the inner peripheral fuel path and the outer peripheral fuel path of the winding heater .

According to this, since the insulating member is provided with a window that opens inside and outside, and the winding heater is exposed in the inner peripheral fuel path and the outer peripheral fuel path of the winding heater, It is possible to efficiently expose most of the winding heater that does not hold the surface.

According to claim 3 of the present invention, the winding heater is provided with an insulating film .

According to this, even if there is a case where the windings come into contact with each other, a short circuit between the lines can be suppressed.

According to claim 4 of the present invention, the insulating film is formed by a metal-based oxide film, or a ceramic or glass-based coating treatment .

According to this, as the insulation treatment applied to the winding, a metal-based oxide film, or a ceramic-based or glass-based coating can be applied.

According to claim 5 of the present invention, the winding heater is an elastic body, and the elastic body is formed in a coil spring shape.

  According to this, the winding heater has a relatively large wire diameter. Therefore, it can be heated up to a relatively high temperature. Furthermore, since the winding heater is formed in a coil spring shape, it is possible to arrange the winding heater made of an elastic body in a self-standing state.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments in which a fuel injection device of the present invention is embodied will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a partial cross-sectional view showing the configuration of the fuel injection device of the present embodiment. FIG. 3 is a cross-sectional view showing the wire of the winding heater.

  The fuel injection device 1 is used for an internal combustion engine (engine), particularly a gasoline engine. The fuel injection device 1 includes a fuel injection valve 2 that directly or indirectly injects fuel into a combustion chamber of an engine, and a control means (hereinafter referred to as ECU) 100 that controls an injection operation of the fuel injection valve 2 and the like. It is configured. The fuel injection valve 2 is attached to an intake pipe (not shown) or a combustion chamber of the engine, and is supplied with fuel pressurized by a fuel pump (not shown). The fuel injected from the fuel injection valve 2 is supplied to the combustion chamber of the engine together with the intake air. The fuel injection valve 2 has a substantially cylindrical shape, receives fuel from one end, and injects fuel from the other end.

  First, the fuel injection valve 2 will be described with reference to FIG. As shown in FIG. 1, the fuel injection valve 2 is disposed at a position in contact with the fuel in the fuel injection valve 2, a valve portion 2 a for intermittently injecting fuel, an electromagnetic drive portion 2 b for driving the valve portion 2 a, and a fuel Heating means 2c for heating the. A filter 11 is attached to the fuel inlet of the fuel injection valve 2 to remove foreign matter. In addition, the valve part 2a interrupts fuel injection by distribute | circulating and interrupting injected fuel. The electromagnetic drive unit 2b switches between the flow operation and the shut-off operation of the valve unit 2a.

  As shown in FIG. 1, the electromagnetic drive unit 2 b includes a coil 31, a metal inner cylinder member 14, a movable body (hereinafter referred to as an armature) 25, and a compression spring 24. In the fuel injection valve 2, when the electromagnetic drive unit 2b is energized, the valve unit 2a is opened, and when the energization to the electromagnetic drive unit 2b is interrupted, the valve unit 2a is closed. The coil 31 is wound around the outer periphery of a resin spool 30. The ends of the coil 31 are drawn out as two terminals 12. The spool 30 is attached to the outer periphery of the metal inner cylinder member 14.

  Here, the coil 31, the spool 30, and the terminal 12 constitute a drive coil.

  A resin mold 13 is disposed on the outer periphery of the metal inner cylinder member 14, and a connector portion 16 that accommodates the terminal 12 is provided. The metal inner cylinder member 14 is a pipe material composed of a magnetic part and a nonmagnetic part, and is formed of, for example, a composite magnetic material. The metal inner cylinder member 14 has a magnetic cylinder part 14a, a nonmagnetic cylinder part 14b, and a magnetic cylinder part 14c from the top to the bottom of FIG. The nonmagnetic cylinder portion 14b is formed by heating a part of the metal inner cylinder member 14 to make it nonmagnetic. An armature housing hole 14e is provided on the inner periphery of the metal inner cylinder member 14, and an armature 25 is housed near the boundary between the nonmagnetic cylinder portion 14b and the magnetic cylinder portion 14c. The metal inner cylinder member 14 is supplied with fuel from the upper end side in FIG. 1 and supplies the fuel to the valve portion 2b. The armature housing hole 14e constitutes a part of this fuel flow path (hereinafter referred to as the fuel flow path). The metal inner cylinder member 14 forms one of magnetic circuits through which a magnetic flux generated when the coil 31 is energized flows. A magnetic member 18 is provided outside the metal inner cylinder member 14. The magnetic member 18 is a plate having a substantially C-shaped cross section and covers a part of the outer periphery of the coil 13. A resin mold 13 is formed on a part of the outer periphery (not shown) and the inner periphery of the magnetic member 18.

  The armature 25 is a stepped substantially cylindrical body made of a ferromagnetic material such as magnetic stainless steel. The armature 25 is fixed to a nozzle needle 26 as a valve member. The suction member 22 is a cylindrical body made of a ferromagnetic material such as magnetic stainless steel. The suction member 22 is disposed opposite to the armature 25 in the axial direction of FIG. 1 and is fixed to the inner periphery of the metal inner cylinder member 14 by press fitting or the like. An adjusting pipe 21 is press-fitted and fixed to the inner periphery of the suction member 22. A compression spring 24 is disposed between the lower end surface of the adjusting pipe 21 and the spring seat 25 c of the armature 25. The compression spring 24 biases the armature 25 toward the valve body 29. Further, the urging force of the compression spring 24 is adjusted by the amount of press fitting of the adjusting pipe 21.

  Here, the magnetic cylinder part 14a, the attraction member 22, the armature 25, the magnetic cylinder part 14c, and the magnetic member 18 constitute a magnetic circuit.

  Furthermore, the inner circumference of the adjusting pipe 21 and the inner circumference of the suction member 22 excluding the inner circumference to which the adjusting pipe 21 is fixed, and the inner space 25e of the armature 25 through the communication hole 25f. The armature housing hole 14e that communicates with each other constitutes a fuel flow path.

  A holder 15 is fixed to the lower end side of the metal inner cylinder member 14 as shown in FIG. The holder 15 is a stepped substantially cylindrical body. The holder 15 includes a holder upper portion 15a that is fixed to the metal inner cylinder member 14 by welding or the like, and a holder lower portion 15b that is fixed to the valve body 29 by welding or the like. In the holder 15, a heating means 2c is built.

  A nozzle needle 26 can be inserted through the inner periphery of the holder upper portion 15a. Of the inner periphery of the holder upper portion 15a, a step portion 15ac is provided on the inner periphery on the valve portion side, as shown in FIG. A first guide member 53 and a spacer 54 are inserted in the inner periphery of the step portion 15ac, and the axial position (the vertical direction in FIG. 1) of the first guide member 53 is selected by selecting the plate thickness of the spacer 54. Contain movably. The first guide member 53 contacts the upper end portion 51 a of the winding heater 51.

  The holder lower portion 15b has a stepped cylindrical shape, and the upper end side inner periphery 15b1 of the holder lower portion 15b is larger than the lower end side inner periphery 15b2. As shown in FIG. 1, the upper end side inner periphery 15 b 1 accommodates the winding heater 51 and the nozzle needle 26 inserted into the winding heater 51. The lower end side inner periphery 15 b 2 is fixed to the outer periphery of the valve body 29. A step portion 15bc is provided at the opening end of the lower end side inner periphery 15b2 opposite to the valve body 29 side. A second guide member 52 is inserted and fixed in the step portion 15bc. The second guide member 52 contacts the lower end portion 51 b of the winding heater 51. Here, the first guide member 53 and the second guide member 52 are formed of an insulating material.

  The storage space 23 is partitioned by the lower end surface of the holder upper portion 15a and the upper end side inner periphery 15b1, and constitutes a fuel flow path. The storage space portion 23 has a predetermined volume and forms a storage space for storing fuel in the fuel flow path. In addition, as a fixing method of the metal inner cylinder member 14 and the holder upper part 15a, the holder upper part 15a and the holder lower part 15b, and the holder lower part 15b and the valve body 29, for example, it is welded from the outside to the entire circumference by laser welding or the like. . In addition, the metal inner cylinder member 14 and the holder 15 constitute a substantially cylindrical member 17 whose fuel flow path extends to the valve portion 2a.

  As shown in FIG. 1, the heating unit 2 c includes a heater (hereinafter referred to as a winding heater) 51 and an energization terminal 55. The winding heater 51 contacts the fuel in the fuel flow path and heats the fuel immediately before being injected from the valve portion 2a. The winding heater 51 uses a heating member made of a resistance wire such as a winding. The wire of the winding heater 51 has a resistance value or conductivity that generates heat to a predetermined temperature when a predetermined power is supplied under a predetermined voltage or current. The element wire may be any metal material such as nichrome wire, copper alloy wire, stainless steel, etc., and if it is stainless steel, the strength and heat resistance are relatively good even if it is a thin wire, elasticity, restoration It is preferable because it also has sex. Hereinafter, the material of the winding heater 51 described in the present embodiment is stainless steel.

  The wire heater 51 has a wire wound in a coil spring shape. Specifically, the winding heater 51 winds around the outer periphery of the nozzle needle 26 with a plurality of turns (in this embodiment, about seven turns shown in FIG. 1).

  Here, the winding heater 51 constitutes an elastic body formed by being wound in a coil spring shape.

  As shown in FIG. 1, the winding heater 51 has an energization terminal 55 drawn out from both end portions 51a and 51b of the coil spring shape. The energization terminal 55 supplies power from the external power source to the winding heater 51. In addition, as shown in FIG. 1, two energizing terminals 55 (only one side is shown in FIG. 1) are joined to each other by welding or the like so as to sandwich the winding heater 51. Specifically, a strand extends downward from the upper end portion 51a of the coil spring-shaped winding heater 51 as shown by a broken line in FIG. 1, and the end portion of the element is connected to the energization terminal by welding or the like. A joining portion 56 that joins the end portion 55a of the 55 is formed. Wires extend upward (not shown) from the lower end portion 51b of the winding heater 51, and similarly, a joining portion 56 that joins the end portion 55a of the energizing terminal 55 (not shown) is formed. Further, the end portions on the external power supply side of these energization terminals 55 are accommodated in the connector portion 16.

  For the coil spring-shaped winding heater 51, the inner circumferences 53a and 52a of the first guide member 53 and the second guide member 52 are respectively a part of the outer circumference of the winding heater 51 (specifically, both axial end portions 51a). , 51b). Further, the seating surfaces 53c and 52c of the first guide member 53 and the second guide member 52 are sandwiched so that a predetermined urging force is generated in the winding heater 51, and the first guide member 53 and the second guide member, respectively. 52 restricts movement of the winding heater 51 in the axial direction. Here, the first guide member 53 and the second guide member 52 constitute an insulating member that holds the winding heater 51.

  In the present embodiment, it is preferable to apply a metal-based oxide film, or a ceramic-based or glass-based coating as the insulating treatment applied to the wire of the winding heater 51.

  The valve portion 2 a includes a valve body 29 and a nozzle needle 26. Inside the valve body 29, a conical inclined surface 29a is formed as a valve seat with which the nozzle needle 26 contacts and separates. A fuel passage through which fuel in the fuel flow path is guided is formed on the inner periphery of the valve body 29.

  The nozzle needle 26 is accommodated in the valve body 29 so as to be movable in the axial direction. The nozzle needle 26 moves in the axial direction by the drive operation of the electromagnetic drive unit 2b. Hereinafter, the movement in the axial direction of the nozzle needle 26 is referred to as lifting. The valve seat 29a cooperates with the nozzle needle 26 to open and close the valve portion 2a. An injection hole 28a is provided on the downstream side of the valve seat 29a. The size of the nozzle hole 28a, 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 28a defines the flow rate when the valve is opened. Therefore, the fuel injection amount of the fuel injection valve 2 is measured by the opening area of the nozzle hole and the valve opening period.

  The ECU 100 is configured as a microcomputer having a known configuration in which a read only memory (ROM), a random access memory (RAM), a microprocessor (CPU), an input port, and an output port (not shown) are connected to each other via a bidirectional bus. Yes. The ECU 100 controls the energization period of the fuel injection valve 2 by starting and stopping energization of the terminal 12 of the fuel injection valve 2 using a power source such as a battery. Further, the ECU 100 uses a power source such as a battery to supply a predetermined amount of power by passing a current through the energization terminal 55 to the winding heater 51 built in the fuel injection valve 2 for a predetermined time. Fuel injection valves are read in accordance with various engine programs (not shown) by reading signals from various sensors (not shown) that detect engine operating conditions such as engine speed, intake pipe pressure (or intake air amount), and coolant temperature. The operations of the second electromagnetic drive unit 2b and the winding heater 51 are controlled.

  Here, the ECU 100 has power supply means for supplying power to the winding heater 51 built in the fuel injection valve 2 as one of means for controlling the system.

  The operation of the fuel injection device 1 having the above-described configuration, particularly the operation of the fuel injection valve 2 will be described below. When the coil 31 is energized, an electromagnetic force is generated in the coil 31. When electromagnetic force is generated in the coil 31, the armature 25 is attracted toward the suction member 22, and the nozzle needle 26 is separated from the valve seat 29a. As a result, the fuel injection valve 2 is opened and fuel is injected through the injection hole 28a. When energization of the coil 31 is stopped, the electromagnetic force generated in the coil 31 disappears. The nozzle needle 26 is pushed toward the valve seat 29a by the compression spring 24, the fuel injection valve 2 is closed, and the fuel injection is shut off. By adjusting the energization period to the coil 31, the amount of fuel sprayed from the fuel injection valve 2 is adjusted. The fuel injected from the fuel injection valve 2 is supplied to the combustion chamber together with the intake air. As a result, the amount of fuel for each combustion can be adjusted.

  For example, when the engine is cold-started, the ECU 100 supplies a current to the winding heater 51 for a predetermined time from the start of the start when detecting an ON state of an ignition key (not shown). When the current supply is started, the winding heater 51 is heated up instantaneously. When current is supplied to the winding heater 51 and the coil 31 is energized and the fuel injection valve 2 is opened, the fuel is heated by the winding heater 51 in contact with the fuel flowing through the fuel flow path. When the heated fuel is injected from the injection hole 28a, the fuel boils under reduced pressure and is atomized. As a result, even during a cold start, a current is passed through the winding heater 51 for a predetermined time and a predetermined amount of electric power is supplied to promote atomization of the fuel, thereby reducing harmful components contained in the exhaust gas. can do.

  Next, operations and effects of the present embodiment will be described. (1) A winding for winding the outer periphery of the nozzle needle 26 in the fuel passage formed in the valve body 29 or in the fuel flow path upstream of the fuel passage. A wire heater 51 is installed. Therefore, the winding heater 51 can be disposed in the fuel around the nozzle needle 26 to directly heat the fuel. Furthermore, the effective heating area can be increased according to the number of windings of the winding heater 51 around the outer periphery of the nozzle needle 26.

  (2) Since the first guide member 53 and the second guide member 52 are provided as insulating members for holding the winding heater 51, the winding heater 51 may be subjected to behavior such as thermal deformation of the winding heater 51 due to self-heating or vibration during fuel injection operation. It is possible to prevent a short circuit between the windings or a short circuit due to the contact between the winding and the surrounding metal member.

(3) the inner periphery 53a of the first guide member 53 and the second guide member 52, 52a is less and also a part of the outer peripheral surface of the winding heater 51 (specifically, the upper end portion 51a and lower portion 51b) only Since it is held by sliding contact, the inside and outside of the winding heater 51 can be substantially exposed. In the winding heater 10 installed in the fuel flow path, the fuel in the inner fuel path and the outer fuel path in the fuel flow path with the winding heater 10 interposed therebetween is substantially uniform with each other. It is possible to heat up to a suitable temperature. Therefore, since the fuel heated up to a substantially uniform fuel temperature is injected from the fuel injection valve 2, the injected fuel (fuel spray) is atomized uniformly.

  (4) The winding heater 51 is formed by being wound in a coil spring shape. For this reason, the two axial ends 51a and 51b of the coiled spring wound at a plurality of turns are used to connect the axial ends 15a and 15Db to the first guide member 53 and the first The axial movement of the winding heater 51 can be restricted by the two guide members 52.

  (5) Furthermore, since the winding heater 51 is made of an elastic body, it has a relatively large winding wire, and can be arranged in a state where the winding heater 51 itself is self-supporting.

  The winding heater 51 and the energization terminal 55 are connected at both axial ends 51a and 51b corresponding to spring seats that are difficult to expand and contract, so that a stable connection state is obtained.

  (6) Furthermore, the winding is provided with a winding film, and as an insulation treatment applied to the wire of the winding heater 51, a metal oxide film, or a ceramic or glass coating is applied. Is preferred. Even if the strands of the winding are in contact with each other, a short circuit between the wires can be suppressed.

(Second Embodiment)
A second embodiment will be described with reference to FIG. In the following description, 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. FIG. 4 is a partial cross-sectional view showing the fuel injection device of the present embodiment.

  In the second embodiment, in the first guide member and the second guide member that constitute the insulating member that holds the winding heater 51, in the first embodiment, the first guide member 53 and the second guide member 52 are wound. Instead of the configuration in which the outer periphery of the wire heater 51 is slidably contacted, the inner periphery of the winding heater 51 is slidably contacted by the second guide 152 as shown in FIG. Further, the second guide 152 is provided with a window 152s that opens to the inside and outside. Specifically, the outer periphery of the second guide 152 is formed by notching a portion facing the inner periphery of the winding heater 51 into two windows 152s.

  The second guide member 152 is inserted and fixed to the step portion 15bc, and the first guide member 153 is inserted and fixed to the step portion 15ac. The second guide member 152 and the seat surfaces 152c and 153c of the first guide member are sandwiched so that a predetermined urging force is generated in the winding heater 51, and the first guide member 153 and the second guide member 152 The movement of the winding heater 51 in the axial direction is restricted.

  Next, the operation and effect of the present embodiment will be described. (1) The insulating members 152 and 153 are provided with windows 152s that can be opened inside and outside, and the winding heater 51 is placed inside and outside the fuel passage (fuel flow passage). Since it is configured to be exposed, it is possible to efficiently expose most of the insulating member 152, 153 that does not hold the surface of the winding heater 51.

  (2) In the present embodiment, the outer peripheral portion of the second guide 152 facing the inner periphery of the winding heater 51 has been described as being cut out in the two windows 152s. However, a configuration in which a large number of communication windows that open in and out are opened. It may be. The exposed area in the fuel passage (fuel flow passage) of the winding heater 51 can be enlarged. Therefore, it is possible to heat and raise the fuel in the inner peripheral fuel path and the outer peripheral fuel path to substantially uniform temperatures with the winding heater 10 interposed therebetween.

It is a fragmentary sectional view showing the composition of the fuel injection device of a 1st embodiment of the present invention. It is a fragmentary sectional view showing the fuel injection device of a 2nd embodiment. It is sectional drawing which shows the strand of a winding heater.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fuel injection apparatus 2 Fuel injection valve 2a Valve part 2b Electromagnetic drive part 2c Heating means 14 Metal inner cylinder member (a part of substantially cylindrical member)
15 Holder (substantially part of a cylindrical member)
15a, 15b Holder upper part, holder lower part 17 Substantially cylindrical member 23 Storage space part 25 Armature (movable body)
26 Nozzle needle (valve member)
28a Injection hole 29 Valve body 29a Valve seat 29b First fitting portion 30 Spool (part of drive coil)
31 Coil (part of the drive coil)
51 Winding heater (heating means)
51a, 51b Upper end, lower end 52 Second guide member (part of insulating member)
53 1st guide member (a part of insulating member)
54 Compression spring (part of biasing means)
55 Current supply terminal 100 ECU (control means)

Claims (5)

A valve body forming a fuel passage and having a valve seat downstream of the fuel passage;
A valve member accommodated in the fuel passage so as to be reciprocally movable and seatable on the valve seat;
A winding heater provided in the fuel passage and wound around an outer periphery of the valve member;
Holding the winding heater by sliding contact only the upstream side end portion and sandwiched between the downstream end write Mutotomoni, the upstream end and the downstream end portion of the outer peripheral surface of the winding heater of the winding heater And an insulating member that exposes the winding heater in the inner and outer fuel paths of the winding heater ,
A fuel injection device comprising: A valve body forming a fuel passage and having a valve seat downstream of the fuel passage;
A valve member accommodated in the fuel passage so as to be reciprocally movable and seatable on the valve seat;
A winding heater provided in the fuel passage and wound around an outer periphery of the valve member;
An insulating member for holding the inner peripheral surface of the winding heater;
With
The insulating member has openings on the inner peripheral side and the outer peripheral side thereof, and is provided with a window having a length extending from the upstream end and the downstream end of the winding heater. A fuel injection apparatus characterized in that the winding heater is exposed in a fuel path and an outer peripheral fuel path . The fuel injection device according to claim 1 , wherein the winding heater is provided with an insulating film . 4. The fuel injection device according to claim 3, wherein the insulating film is formed by a metal-based oxide film, or a ceramic or glass-based coating process . 5. The winding heater is an elastic body,
The fuel injection device according to any one of claims 1 to 4, wherein the elastic body is formed in a coil spring shape .

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