JP7208884B2 - fuel injector - Google Patents

Description

The present invention relates to a fuel injection device for injecting fuel such as light oil and gasoline.

Some fuel injection devices are configured as follows. A fuel injection device has a valve body, a movable valve, and an actuator. A nozzle hole is provided in the valve body. The movable valve is installed in a valve body so as to reciprocate in a predetermined lift direction and an opposite anti-lift direction. The actuator has a magnetic pole face facing the movable valve on the lift direction side of the movable valve, and draws the movable valve to the magnetic pole face to displace the movable valve in the lift direction. is displaced in the anti-lift direction. As a document showing such a technique, there is the following Patent Document 1.

International Publication No. 2013/178443

Among such fuel injection devices, there is one that regulates the maximum lift amount of the movable valve in the following manner. That is, a restricting portion is provided at the end of the movable valve in the lift direction. A stopper facing the restricting portion is provided on the lift direction side of the restricting portion in the fuel injection device. The maximum lift amount of the movable valve is regulated by the regulating portion coming into contact with the stopper.

However, the inventor of the present invention has noticed that such a fuel injection device may cause the following problems. That is, when the fuel injection device is clamped and attached to the engine head or the like in the anti-lift direction, the clamping load compresses the valve body or the like by several μm to several tens of μm in the anti-lift direction. The stopper is thereby also shifted in the anti-lift direction. On the other hand, since the movable valve is in an independent floating state within the valve body, the clamp load is not transmitted to the movable valve. Therefore, the restricting portion of the movable valve does not shift in the anti-lift direction even if the clamping is performed.

In this way, the stopper shifts in the anti-lift direction, whereas the restricting portion does not shift in the anti-lift direction, thereby reducing the maximum lift amount of the movable valve. And such a problem can occur particularly conspicuously when the movable valve is long in the lift direction. This is because if the movable valve is long in the lift direction, the length section of the valve body and the like corresponding to the movable valve, that is, the length section in which the valve body and the like contracts even though the movable valve does not contract, becomes long.

Therefore, the present inventor considered providing the restricting portion not at the end of the movable valve in the lift direction, but near the anti-lift direction. According to this, the stopper facing the restricting portion is also arranged nearer to the anti-lift direction. Therefore, the amount by which the stopper is shifted in the anti-lift direction by the clamp can be reduced compared to when the stopper is arranged closer to the lift direction. Therefore, it is possible to suppress the decrease in the maximum lift amount of the movable valve.

However, the inventor of the present invention has noticed that the following problem may occur when the restricting portion is provided near the lift direction. That is, in such a case, the lift direction side portion of the movable valve is longer than the restricting portion. Therefore, even after the movable valve is displaced in the lift direction and the regulating portion abuts against the stopper, the pull by the actuator is maintained, and the portion of the movable valve on the lift direction side of the regulating portion is elastically deformed. It stretches in the lift direction. As a result, the movable valve may collide with the magnetic pole surface and wear the magnetic pole surface.

Such a problem can be particularly noticeable when the movable valve is likely to be elastically deformed in the lift direction, such as when the movable valve is long in the lift direction. On the other hand, even when the movable valve extends in the lift direction, if the distance between the movable valve and the magnetic pole surface is made sufficiently large so that the movable valve does not collide with the magnetic pole surface, the movable valve will be attracted to the magnetic pole surface. power will decrease.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances. The main purpose is to suppress this by a method other than the method of increasing the distance between the movable valve and the magnetic pole surface.

A fuel injection device of the present invention has a valve body, a movable valve, and an actuator. An injection hole is provided in the valve body. The movable valve is installed in the valve body so as to reciprocate in a predetermined lift direction and an opposite anti-lift direction. The actuator has a magnetic pole surface facing the movable valve on the lift direction side of the movable valve, and draws the movable valve to the magnetic pole surface to displace the movable valve in the lift direction. By releasing the bias, the movable valve is displaced in the anti-lift direction. The injection hole is opened and closed based on the displacement of the movable valve.

The movable valve is provided with a first restricting portion, and the movable valve is provided with a second restricting portion on the lift direction side of the first restricting portion. The fuel injection device includes a first stopper facing the first restricting portion on the lift direction side of the first restricting portion, and the second restricting portion on the lift direction side of the second restricting portion. A second stopper facing the portion is provided.

When the movable valve is displaced in the lift direction, the first restricting portion contacts the first stopper in a state where a gap is formed between the second restricting portion and the second stopper. touch. From this state, when the movable valve is extended by a predetermined amount or more in the lift direction due to the attraction by the actuator, the second magnetic pole face is in a state in which a gap is formed between the movable valve and the magnetic pole surface. A restricting portion contacts the second stopper.

According to the present invention, when the movable valve is displaced in the lift direction, the first restricting portion contacts the first stopper in a state where the gap is formed between the second restricting portion and the second stopper. Therefore, the maximum lift amount of the movable valve is not restricted by the second stopper, and the maximum lift amount of the movable valve is restricted by the first stopper. The first stopper is on the anti-lift direction side of the second stopper. Therefore, the first stopper is more difficult to shift in the anti-lift direction than the second stopper even when the fuel injection device is clamped in the anti-lift direction. Therefore, compared with the case where the maximum lift amount of the movable valve is regulated by the second stopper, it is possible to suppress the decrease in the maximum lift amount of the movable valve due to the clamp.

Further, when the movable valve extends in the lift direction by a predetermined amount or more due to the attracting force of the actuator from the state in which the first restricting portion is in contact with the first stopper, the gap between the movable valve and the magnetic pole face is increased. The second restricting portion contacts the second stopper in the state where the gap is formed. Therefore, the second stopper can prevent or suppress the movable valve from colliding with the magnetic pole surface.

As described above, the decrease in the maximum lift amount of the movable valve due to the clamping is suppressed by arranging the first stopper closer to the anti-lift direction, while the collision of the movable valve with the magnetic pole surface is prevented by the second stopper. In other words, it can be prevented or suppressed by a method other than the method of increasing the distance between the movable valve and the magnetic pole surface.

1 is a cross-sectional front view showing a fuel injection device according to a first embodiment; Front cross-sectional view showing the upper end of the movable valve and its surroundings Front cross-sectional view showing the lower end of the movable valve and its surroundings Front cross-sectional view showing displacement of the upper end of the movable valve FIG. 11 is a front cross-sectional view showing displacement of the upper end portion of the movable valve in the second embodiment;

Next, embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited to the embodiments, and can be modified as appropriate without departing from the gist of the invention.

[First embodiment]
FIG. 1 is a front sectional view showing a fuel injection device 91 of the first embodiment. Hereinafter, one of the longitudinal directions of the fuel injection device 91 will be referred to as "upper" and the other will be referred to as "lower" in accordance with the drawings. It can be installed with its longitudinal direction arbitrarily set, for example, it can be installed with its longitudinal direction set horizontally. The "upper D2" in this embodiment corresponds to the "lift direction" in the present invention, and the "downward D1" in the present embodiment corresponds to the "anti-lift direction" in the present invention.

The fuel injection device 91 includes a valve body 10, a needle valve 30 installed inside the valve body 10, a pressure chamber 36 that drives the needle valve 30, a movable valve 60 that controls the pressure in the pressure chamber 36, and an actuator 70 that drives the movable valve 60 .

The valve body 10 has a nozzle body 11, a plate 12 and an injector body 16 in order from the bottom. The nozzle body 11 and the plate 12 are fastened to the bottom of the injector body 16 by fastening members 13 .

The valve body 10 is formed with a high-pressure passage 21 for supplying high-pressure fuel to the injection hole 22 and the pressure chamber 36, and a low-pressure passage 39 for returning the pressure of the pressure chamber 36 to the fuel tank. . The nozzle body 11 is a cylindrical body that opens upward D2, and has an injection hole 22 at its lower end. The injector body 16 and the plate 12 are provided with holes forming high pressure passages 21 .

The needle valve 30 is inserted inside the nozzle body 11 so as to be vertically slidable. The needle valve 30 opens the injection hole 22 when it rises, and closes the injection hole 22 when it falls. A gap between the inner peripheral surface of the nozzle body 11 and the outer peripheral surface of the needle valve 30 forms part of the high pressure passage 21 .

A guide 32 is provided on the inner peripheral surface of the nozzle body 11 and is in sliding contact with the outer peripheral surface of the needle valve 30 . A plurality of cut portions 31 for securing the high-pressure passage 21 are formed at intervals in the circumferential direction at a height portion of the outer peripheral surface of the needle valve 30 that is in sliding contact with the guide 32 .

The pressure chamber 36 is provided above the needle valve 30 D<b>2 . Specifically, a cylinder 34 is fitted onto the upper end of the needle valve 30 . A needle valve spring 33 is installed around the upper portion of the needle valve 30 to press the needle valve 30 downward D1 and to press the cylinder 34 upward D2 by its reaction force to urge the lower surface of the plate 12. It is A pressure chamber 36 is formed in a region surrounded by the upper surface of the needle valve 30, the inner peripheral surface of the cylinder 34, and the lower surface of the plate 12. As shown in FIG.

The outer diameter of the cylinder 34 is slightly smaller than the inner diameter of the nozzle body 11, and the gap between the outer peripheral surface of the cylinder 34 and the inner peripheral surface of the nozzle body 11 forms part of the high pressure passage 21. there is The plate 12 is provided with a supply port 35 for supplying the fuel in the high pressure passage 21 to the pressure chamber 36 and a discharge port 37 for discharging the fuel in the pressure chamber 36 to the low pressure passage 39 . The supply port 35 is provided with an in-orifice 35a, and the discharge port 37 is provided with an out-orifice 37a.

The movable valve 60 is installed inside the injector body 16 so as to be able to reciprocate in the vertical direction. The movable valve 60 has a movable valve body 65 and a rotating member 55 attached to its lower end. The movable valve 60 opens the upper opening of the discharge port 37 by rising. As a result, the pressure in the pressure chamber 36 is lowered, the needle valve 30 is raised, and the nozzle hole 22 is opened. On the other hand, the movable valve 60 closes the upper opening of the discharge port 37 by descending. As a result, the pressure in the pressure chamber 36 rises, the needle valve 30 descends, and the injection hole 22 closes.

The movable valve 60 is elongated in the vertical direction so that the actuator 70 can be arranged above D2 where there is ample space. Specifically, the movable valve 60 is longer than the needle valve 30 in the vertical direction, and more specifically, is twice as long as the needle valve 30 in the vertical direction. As a result, the lower end of the movable valve 60 is positioned below the vertical center line C of the valve body 10 at D1, while the upper end of the movable valve 60 and the actuator 70 are positioned above the center line C at D2. are placed. Specifically, the center line C is the bisector of a vertical line extending from the lower end of the nozzle body 11 to the upper end of the injector body 16 .

The movable valve body 65 has a vertically elongated shaft portion 65a and a disk-shaped driven portion 65b extending laterally from the upper portion of the shaft portion 65a. At least the driven portion 65b of the movable valve body 65 is made of a magnetic material. The valve body 10 is provided at its upper portion with a storage recess 16b that opens upward D2, and is provided with a through hole 16a that extends downward D1 from the bottom surface of the storage recess 16b and penetrates to the lower end surface of the injector body 16. . A holding member 45 is installed in the storage recess 16b. A holding hole 45a is formed through the holding member 45 in the vertical direction. The movable valve 60 has a shaft portion 65a inserted into the through hole 16a and the holding hole 45a, and a driven portion 65b stored in the storage recess 16b. The outer peripheral surface of the upper portion of the shaft portion 65a is in sliding contact with the inner peripheral surface of the holding hole 45a.

A gap is formed between the inner peripheral surface of the through hole 16 a and the outer peripheral surface of the shaft portion 65 a , and this gap forms part of the low pressure passage 39 . A communication hole 16 c communicating with the storage recess 16 b is provided in the upper portion of the injector body 16 , and this communication hole 16 c also constitutes a part of the low pressure passage 39 .

The actuator 70 is installed above the movable valve 60 D<b>2 by being fastened to the upper end portion of the injector body 16 with a fastening member 17 . The actuator 70 has an actuator body 71 , a cylindrical member 73 , a movable valve spring 75 and a solenoid 77 . The actuator body 71 has a first member 71a, a second member 71b, and a third member 71c, and a mounting hole 72 is provided in the axial center portion of the first member 71a and the second member 71b. A cylindrical member 73 is attached to the attachment hole 72 .

FIG. 2 is a cross-sectional front view showing the upper end portion of the movable valve 60 and its surroundings in the closed state, which is the lowest state in which the movable valve 60 can freely reciprocate. The movable valve spring 75 is installed inside the cylindrical member 73 and presses the upper surface of the movable valve 60 downward D1.

The second member 71b is a magnetic material such as ferrite, and its lower end surface forms a magnetic pole surface 79. As shown in FIG. The magnetic pole surface 79 faces the upper surface of the driven portion 65b at a position D2 above the driven portion 65b. The solenoid 77 is installed inside the second member 71b by winding the cylindrical member 73 around it. When the solenoid 77 is energized, it generates a magnetic field in the second member 71b to pull the driven portion 65b toward the magnetic pole surface 79, thereby raising the movable valve 60. As shown in FIG. On the other hand, when the solenoid 77 is de-energized, the movable valve 60 is lowered by canceling the attraction. At this time, the movable valve spring 75 assists the downward movement of the movable valve 60 by pressing the movable valve 60 downward D1.

The upper surface of the driven portion 65b has a planar shape extending in the horizontal direction. The upper surface of the driven portion 65b is provided with a projection-like second restricting portion 68 projecting upward D2. A lower surface of the cylindrical member 73 constitutes a second stopper 78 . The second stopper 78 faces the second restricting portion 68 at a position D<b>2 above the second restricting portion 68 . The outer diameter of the lower surface of the cylindrical member 73 , that is, the outer diameter of the second stopper 78 is larger than the outer diameter of the second restricting portion 68 . The second stopper 78 is substantially flush with the magnetic pole surface 79 in this embodiment. However, the second stopper 78 may be recessed above the magnetic pole surface 79 within a range that does not exceed the upward projection length D<b>2 of the second restricting portion 68 . The hardness of the cylindrical member 73 is higher than that of the second member 71b. Therefore, the hardness of the second stopper 78 is higher than that of the magnetic pole face 79 .

In this valve closed state, a second gap G2, which is a gap in the vertical direction, is formed between the second restricting portion 68 and the second stopper 78, and between the upper surface of the driven portion 65b and the magnetic pole surface 79. , a third gap G3, which is a vertical gap larger than the second gap G2, is formed.

FIG. 3 is a cross-sectional front view showing the lower end of the movable valve 60 and its surroundings in the closed state. A narrowed portion 15a is formed at the lower end of the through hole 16a. A plate recess 12 a is provided on the upper surface of the plate 12 . The rotating member 55 and the lower end of the movable valve body 65 are housed in the plate recess 12a. An upper opening of the discharge port 37 is formed in the center of the bottom surface of the plate recess 12a.

A spherical portion 64 is provided at the lower end of the movable valve body 65 . The rotating member 55 is provided with an engaging hole 56 that penetrates sideways and opens upward D2. By engaging the spherical portion 64 in the engaging hole 56 , the rotating member 55 is rotatably engaged with the lower end portion of the movable valve body 65 . A portion of the lower end surface of the rotating member 55 constitutes the sealing surface 51 , and a portion of the upper surface of the rotating member 55 constitutes a first restricting portion 58 . A portion of the lower surface of the injector body 16 facing the first restricting portion 58 at a position D<b>2 above the first restricting portion 58 constitutes the first stopper 18 .

In this valve closed state, the seal surface 51 of the rotating member 55 closes the upper opening of the discharge port 37 by coming into contact with the periphery of the upper opening of the discharge port 37 on the bottom surface of the plate recess 12a. At this time, a first gap G1, which is vertically smaller than the second gap G2, is formed between the first restricting portion 58 and the first stopper 18. As shown in FIG. When the movable valve 60 expands in the vertical direction due to heat, such a magnitude relationship (G1<G2<G3) of the first to third gaps G1 to G3 is preferably within all or at least the main temperature ranges at times.

When the movable valve 60 rises from the state shown in FIG. 3, the sealing surface 51 of the rotating member 55 moves away from the upper opening peripheral edge of the discharge port 37, thereby opening the upper opening of the discharge port 37. As shown in FIG. After that, the maximum lift amount of the movable valve 60 is restricted by the contact of the first restricting portion 58 with the first stopper 18 . At this time, the low-pressure passage 39 is secured by the lateral portion of the movable valve body 65 in the engagement hole 56 that opens upward D2.

FIG. 4 is a front sectional view showing the displacement of the upper end of the movable valve 60. FIG. FIG. 4(a) shows the valve closed state. When the movable valve 60 is raised from the closed state shown in FIG. 4(a), the second gap G2 and the third gap G3 are smaller than those shown in FIG. 4(a). , the first restricting portion 58 contacts the first stopper 18 . This is because the first gap G1 is smaller than the second gap G2 and the third gap G3. Thereby, the maximum lift amount of the movable valve 60 is regulated as described above.

From this state, when the movable valve 60 is extended upward D2 by a predetermined amount or more due to the pulling by the actuator 70 being maintained, the third gap G3 is still formed as shown in FIG. 4(b). In this state, the second restricting portion 68 contacts the second stopper 78 . This is because the second gap G2 is smaller than the third gap G3. Further extension of the movable valve 60 is thereby restricted. In this embodiment, the second restricting portion 68 contacts the second stopper 78 every time after the first restricting portion 58 contacts the first stopper 18 .

According to this embodiment, the following effects are obtained. When the movable valve 60 is raised, the first restricting portion 58 contacts the first stopper 18 while the second gap G2 is still formed between the second restricting portion 68 and the second stopper 78. . Therefore, the maximum lift amount of the movable valve 60 is not restricted by the second stopper 78 , and the maximum lift amount of the movable valve 60 is restricted by the first stopper 18 . The first stopper 18 is located below the second stopper 78 D1. Therefore, compared to the second stopper 78, the first stopper 18 is less likely to shift downward D1 even when the fuel injection device 91 is clamped downward D1. Therefore, compared with the case where the maximum lift amount of the movable valve 60 is restricted by the second stopper 78, it is possible to suppress the decrease in the maximum lift amount of the movable valve 60 due to the clamp.

When the movable valve 60 is extended upward D2 by a predetermined amount or more due to the attracting force of the actuator 70 from the state in which the first restricting portion 58 is in contact with the first stopper 18, the movable valve 60 and the magnetic pole The second restricting portion 68 contacts the second stopper 78 in a state where the third gap G3 is still formed with the surface 79 . Therefore, the second stopper 78 can prevent the movable valve 60 from colliding with the magnetic pole surface 79 . Therefore, wear of the magnetic pole surface 79 can be prevented.

Furthermore, the hardness of the second stopper 78 is higher than the hardness of the magnetic pole face 79 . Therefore, the second stopper 78 is also less likely to wear out. Also, the second stopper 78 is provided on the cylindrical member 73 . Since the cylindrical member 73 is a separate member from the second member 71b (ferrite or the like) having the magnetic pole face 79, it does not need to be made of ferrite or the like unlike the second member 71b. Therefore, the cylindrical member 73 has a high degree of freedom in material selection and can be easily made to have high hardness. Therefore, the second stopper 78 provided on the cylindrical member 73 can also be easily hardened.

In addition, the following effects are also obtained. After the first restricting portion 58 contacts the first stopper 18, if the second restricting portion 68 does or does not contact the second stopper 78, the following problems may occur. When the second restricting portion 68 does not contact the second stopper 78, the movable valve 60 starts to descend from a position where the second restricting portion 68 is lower than when it contacts. Further, when the second restricting portion 68 comes into contact with the second stopper 78, the second restricting portion 68 is in close contact with the second stopper 78, and some force is required to separate them. As a result, there is a possibility that the fuel injection amount will fluctuate due to a difference in the speed of lowering of the movable valve 60 between when the second restricting portion 68 contacts the second stopper 78 and when it does not. . In this regard, here, after the first restricting portion 58 contacts the first stopper 18, the second restricting portion 68 contacts the second stopper 78 every time, so such variations can be eliminated.

In addition, the following effects are also obtained. By lengthening the movable valve 60, the actuator 70 can be easily arranged above the valve body 10 where there is enough space. In fact, the actuator 70 is arranged above the center line C of the valve body 10 in the vertical direction D2. However, as described above, the problem that the maximum lift amount of the movable valve 60 is reduced by clamping and the problem that the movable valve 60 expands and collides with the magnetic pole surface 79 are more likely to occur when the movable valve 60 is long. In this regard, in the present embodiment, in a mode in which the movable valve 60 is long, that is, in a mode in which the above problems are likely to occur, a configuration for solving the above problems, that is, the above-described first stopper 18 is provided. The lower arrangement and the aforementioned second stopper 78 are employed. Therefore, the effect of this embodiment can be exhibited more remarkably.

In addition, the following effects are also obtained. It is preferable that the first restricting portion 58 and the first stopper 18 are provided as low as possible in order to further suppress a decrease in the maximum lift amount of the movable valve 60 due to clamping. Moreover, it is preferable that the second restricting portion 68 and the second stopper 78 are provided as close to the top as possible in order to further suppress the extension of the movable valve 60 due to the pulling of the actuator 70 . In that respect, here, as shown in FIG. is provided above the center line C of the More specifically, the first restricting portion 58 and the first stopper 18 are provided at the lower end portion of the movable valve 60 and its periphery, and the second restricting portion 68 and the second stopper 78 are provided at the upper end portion and the periphery of the movable valve 60 . located around it. Therefore, it is possible to effectively suppress the decrease in the maximum lift amount of the movable valve 60 due to clamping and the elongation of the movable valve 60 due to the attraction of the actuator 70 .

[Second embodiment]
Next, a second embodiment will be described. In the following embodiments, members that are the same as or correspond to those in the previous embodiments are denoted by the same reference numerals. This embodiment will be described based on the first embodiment, focusing on points that differ from this.

FIG. 5 is a front sectional view showing how the upper end portion of the movable valve 60 is displaced in the fuel injection device 92 of this embodiment. A lower end portion of the cylindrical member 73 protrudes downward D<b>1 from the magnetic pole surface 79 , and the lower surface thereof constitutes a second stopper 78 . The second restricting portion 68 of the movable valve 60 does not protrude upward D2 from the upper surface of the driven portion 65b. Configure.

FIG. 5(a) shows the valve closed state. When the movable valve 60 is raised from the closed state shown in FIG. 5(a), the second gap G2 and the third gap G3 are smaller than those shown in FIG. 5(a). , the first restricting portion 58 contacts the first stopper 18 . From this state, when the movable valve 60 is extended upward D2 by a predetermined amount or more due to the pulling by the actuator 70 being maintained, the third gap G3 is still formed as shown in FIG. 5(b). In this state, the second restricting portion 68 contacts the second stopper 78 .

This embodiment can also provide the same effects as those of the first embodiment.

[Other embodiments]
This embodiment can also be implemented with the following modifications. For example, instead of providing the second restricting portion 68 at the upper end of the movable valve 60, a second restricting portion protruding sideways is provided on the side surface of the movable valve 60, such as the middle portion in the vertical direction, and a second restricting portion is provided above the second restricting portion. You may provide the 2nd stopper which opposes 2 control part. However, even after the second restricting portion comes into contact with the second stopper, the portion above the second restricting portion of the movable valve 60 will extend upward, so the second restricting portion should be installed as close to the top as possible. is preferred.

Further, for example, when variation in the fuel injection amount is not a big problem, the second restricting portion 68 contacts the second stopper 78 every time after the first restricting portion 58 contacts the first stopper 18 . Instead of: That is, when the attracting force of the movable valve 60 by the actuator 70 is relatively small, the second restricting portion 68 does not come into contact with the second stopper 78, and when the attracting force is relatively large, the second restricting portion 68 may abut on the second stopper 78 .

Further, for example, in specifications where the fuel pressure is not so high, the movable valve 60 and the needle valve 30 may be integrated. That is, the actuator 70 may directly open and close the injection hole 22 by driving the integrated valve. Further, for example, as described above, the effect of each embodiment can be exhibited more remarkably when the movable valve 60 is longer. good.

DESCRIPTION OF SYMBOLS 10...Valve body 18...First stopper 22...Injection hole 58...First restriction part 60...Movable valve 68...Second restriction part 70...Actuator 78...Second stopper 79...Magnetic pole face, 91, 92... fuel injection device, G1... first gap, G2... second gap, G3... third gap.

Claims (8)

a valve body (10) provided with an injection hole (22);
a movable valve (60) installed in the valve body so as to reciprocate in a predetermined lift direction (D2) and an opposite anti-lift direction (D1);
A magnetic pole surface (79) facing the movable valve on the lift direction side of the movable valve is provided, and the movable valve is displaced in the lift direction by attracting the movable valve to the magnetic pole surface. an actuator (70) that displaces the movable valve in the anti-lift direction by releasing the
In the fuel injection device (91, 92) in which the injection hole is opened and closed based on the displacement of the movable valve,
A first restricting portion (58) is provided in the movable valve, and a second restricting portion (68) is provided on the lift direction side of the first restricting portion in the movable valve, and A first stopper (18) facing the first restricting portion on the lift direction side, and a second stopper (78) facing the second restricting portion on the lift direction side of the second restricting portion. is provided,
When the movable valve is displaced in the lift direction, in a state where a gap (G2) is formed between the second restricting portion and the second stopper, the first restricting portion moves to the first stopper. A gap (G3) is formed between the movable valve and the magnetic pole face when the movable valve is extended in the lift direction by a predetermined amount or more from that state due to the attraction by the actuator. state WHEREIN: The fuel-injection apparatus with which a said 2nd control part contact|abuts on a said 2nd stopper. The second restricting portion is provided at an end of the movable valve on the lift direction side,
A first clearance that is a clearance in the lift direction between the first restricting portion and the first stopper in a state in which the movable valve is arranged on the most anti-lift direction side within the range in which the movable valve can freely reciprocate. A second gap (G2), which is a gap in the lift direction between the second restricting portion and the second stopper, is larger than (G1), and the movable valve is larger than the second gap. 2. The fuel injection device according to claim 1, wherein a third gap (G3), which is a gap in the lift direction between and the magnetic pole face, is larger. a valve body (10) provided with an injection hole (22);
a movable valve (60) installed in the valve body so as to reciprocate in a predetermined lift direction (D2) and an opposite anti-lift direction (D1);
A magnetic pole surface (79) facing the movable valve on the lift direction side of the movable valve is provided, and the movable valve is displaced in the lift direction by attracting the movable valve to the magnetic pole surface. an actuator (70) that displaces the movable valve in the anti-lift direction by releasing the
In the fuel injection device (91, 92) in which the injection hole is opened and closed based on the displacement of the movable valve,
A first restricting portion (58) is provided in the movable valve, and a second restricting portion (68) is provided on the lift direction side of the first restricting portion in the movable valve, and A first stopper (18) facing the first restricting portion on the lift direction side, and a second stopper (78) facing the second restricting portion on the lift direction side of the second restricting portion. is provided,
The second restricting portion is provided at an end of the movable valve on the lift direction side,
A first clearance that is a clearance in the lift direction between the first restricting portion and the first stopper in a state in which the movable valve is arranged on the most anti-lift direction side within the range in which the movable valve can freely reciprocate. A second gap (G2), which is a gap in the lift direction between the second restricting portion and the second stopper, is larger than (G1), and the movable valve is larger than the second gap. and the magnetic pole face, wherein a third gap (G3), which is a gap in the lift direction, is larger. 2. The fuel injection device according to claim 1, wherein hardness of said second stopper is higher than hardness of said magnetic pole face. The fuel injection device according to any one of claims 1 to 4, wherein the second restricting portion contacts the second stopper each time after the first restricting portion contacts the first stopper. A needle valve (30) is slidably installed inside the valve body and opens and closes the injection hole by sliding. Having a pressure chamber (36) that opens and closes, and a discharge port (37) that discharges fuel from the pressure chamber,
the movable valve opens the discharge port by being displaced in the lift direction and closes the discharge port by being displaced in the anti-lift direction;
The fuel injection device according to any one of claims 1 to 5, wherein the lift direction and the anti-lift direction are displacement directions, and the movable valve is longer in the displacement direction than the needle valve. With the lift direction and the anti-lift direction as displacement directions, an end of the movable valve in the anti-lift direction is arranged in the anti-lift direction relative to a central portion (C) of the valve body in the displacement direction, The fuel injection device according to any one of claims 1 to 6, wherein the end of the movable valve in the lift direction and the actuator are arranged in the lift direction rather than the central portion. The first restricting portion and the first stopper are arranged in the anti-lift direction relative to the central portion, and the second restricting portion and the second stopper are arranged in the lift direction relative to the central portion. 8. The fuel injector of claim 7, wherein:

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