JP2000186645A - Variable nozzle type fuel injection nozzle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a nozzle variable mechanism and improve the degree of freedom of spray, to adapt this nozzle for a pressure storage type fuel injection system employing a common rail, and to prevent leakage of fuel through a control valve part for a needle valve to effect lift control of a needle valve to perform opening and closing operation of the nozzle. SOLUTION: It is noticed that a control valve 24 for a needle valve (a solenoid valve for a needle valve) is attached to the side of this nozzle and thus seal is practicable between a drive shaft 27 to drive a rotary valve 28 and its actuator 26. This nozzle comprises a hydraulic command piston 18 to energize a needle valve 5 in a valve closing direction; and a control valve 24 for a needle valve to control the back pressure of the hydraulic command piston 18. The control valve 24 for a needle valve is arranged in a position where the valve does not cross the drive shaft 27.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable injection hole type fuel injection nozzle, and more particularly to a fuel injection nozzle for supplying fuel to a diesel engine or other internal combustion engines in an atomized state. The present invention relates to a variable injection hole type fuel injection nozzle capable of making the injection hole area variable for each nozzle.

[0002]

2. Description of the Related Art A fuel injection nozzle for a fuel injection device having a pressure accumulation pipe (common rail) used for a diesel engine or other internal combustion engines, or a fuel for a jerk type fuel injection device for pumping fuel by the number of combustions of the engine. A fuel that improves engine performance by providing a variable injection hole variable mechanism of the rotary valve type in the injection nozzle, making the opening cross-sectional area (injection hole cross-sectional area) of the injection hole variable in the nozzle body, and realizing appropriate spray characteristics. Injection systems are being developed. For example, JP-A-8-93601, JP-A-9-280134 or JP-A-10-1106
No. 61 etc.

However, there has not yet been any of the above-mentioned common rail type fuel injection nozzles provided with an injection hole variable mechanism. That is, in the case of the conventional common rail fuel injection system, the fuel injection amount is determined mainly by only the two parameters of the injection pressure from the common rail and the injection period. There is a problem that can not be performed. Here, by making the injection hole area variable and increasing the control parameters, more detailed injection amount control can be performed. In addition, even when the injection amount is low, the injection holes can be narrowed, so that high-pressure fuel injection with a long injection period can be performed, and a spray pattern suitable for engine combustion can be formed. There is a problem that an appropriate configuration for providing an actuator for controlling the opening and closing of the fuel injection valve and an electromagnetic valve for driving the injection hole variable mechanism in the fuel injection nozzle portion has not been developed.

Further, when a rotary valve and its drive shaft are adopted as the injection hole variable mechanism,
Depending on the relative position between the drive shaft and a portion for controlling the opening and closing (lift control) of the needle valve, there is a problem that the fuel is likely to leak out.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems and provides a variable injection hole type fuel injection nozzle applicable to a pressure accumulating type fuel injection system employing a common rail. That is the task.

Another object of the present invention is to provide a variable injection hole type fuel injection nozzle capable of preventing fuel leakage from a needle valve control valve portion for performing lift control of a needle valve for opening and closing an injection hole. I do.

Another object of the present invention is to provide a variable injection hole type fuel injection nozzle which has an injection hole variable mechanism and can increase the degree of freedom of spraying.

[0008]

That is, the present invention is to provide a control valve for a needle valve, such as a solenoid valve for a needle valve, so that a seal can be provided between a drive shaft for driving the rotary valve and its actuator. Focusing on what can be done, a nozzle body having a predetermined injection hole cross-sectional area and a sheet surface connected to the injection hole, and a reciprocatingly provided nozzle body in the nozzle body and lift from the sheet surface A needle valve that allows fuel to be injected from the injection hole, and a rotary valve that can adjust the relative position of the injection hole,
An actuator for rotating the rotary valve,
A drive shaft for transmitting the driving force of the actuator to the rotary valve; and rotating the rotary valve by the actuator via the drive shaft to change the injection hole cross-sectional area of the injection hole. A variable injection hole type fuel injection nozzle, which has a hydraulic command piston for urging the needle valve in the valve closing direction, and a needle valve control valve for controlling the back pressure of the hydraulic command piston, The control valve for a needle valve is a variable injection hole type fuel injection nozzle, which is provided at a position not intersecting with the drive shaft.

The needle valve control valve may be provided at a position lateral to the actuator.

[0010] A seal member may be provided at a portion between the drive shaft and the back pressure chamber of the hydraulic command piston.

The needle valve control valve may be a two-way valve or a three-way valve.

As the control valve for the needle valve, a piezoelectric element or the like can be employed in addition to the solenoid valve having a two-way valve or a three-way valve configuration.

In the variable injection hole type fuel injection nozzle according to the present invention, the control valve for the needle valve is, for example, laterally mounted at a position not intersecting with the drive shaft for driving the rotary valve for changing the injection hole. In addition to minimizing fuel leakage from parts, it is also possible to control both opening and closing of the needle valve and opening degree of the injection hole, making the injection hole variable even in fuel injection systems equipped with common rails As a result, the degree of freedom of spraying can be increased. That is, if the drive shaft intersects with the needle valve control valve, fuel leakage may occur from the outer peripheral portion of the drive shaft. However, if the needle valve control valve does not cross the drive shaft, the drive Sealing between the shaft and its actuator, specifically
For example, a seal member such as an O-ring can be provided at a portion between the drive shaft and the back pressure chamber of the hydraulic command piston, so that fuel leakage from the drive shaft portion can be prevented.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a variable injection hole type fuel injection nozzle according to a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows a variable injection hole type fuel injection nozzle 1.
FIG. 3 is a cross-sectional view of the variable injection hole type fuel injection nozzle 1. The variable injection hole type fuel injection nozzle 1 includes a nozzle housing 2, a nozzle body 3 and a solenoid housing 4 attached to the nozzle housing 2, and a needle valve 5 reciprocatingly sliding inside the nozzle body 3. , An injection hole variable mechanism 6.

A high-pressure fuel from a common rail 9 in which high-pressure fuel is accumulated from a fuel tank 7 by a fuel pump 8 can be supplied to the variable injection hole type fuel injection nozzle 1 from a fuel introduction unit 10. That is, a fuel introduction portion 10 for introducing the fuel to be pumped from the common rail 9 is formed in the housing body 4, a fuel passage 11 is formed to the nozzle body 3, and pressure can be applied to the needle valve 5 in the fuel accumulation chamber 12. .

FIG. 2 is an enlarged sectional view of a part II in FIG.
FIG. 3 is an enlarged sectional view taken along the line III-III of FIG. 2, wherein the variable injection hole type fuel injection nozzle 1 is a hole nozzle type; A plurality of (for example, five) injection holes 14 are formed at equal angular intervals.

The needle valve 5 blocks the fuel passage 11 from the fuel introduction portion 7 and the injection hole 14 by seating the seat portion 15 on a seat surface 16 connected to the injection hole 14 of the nozzle body 3. . In the fuel reservoir 9 (FIG. 1), the pressure receiving portion 17 of the needle valve 5 receives fuel pressure. The needle valve 5 abuts a hydraulic command piston 18 at an upstream end thereof, and the hydraulic command piston 18 seats the needle valve 5 on the seat surface 16 of the nozzle body 3 by the urging force of a valve spring 19. When the needle valve 5 is lifted against the urging force of the valve spring 19, fuel can be injected from the injection hole 14.

The hydraulic command piston 18 has a back pressure chamber 20 formed at its upper end with the inner wall surface of the nozzle housing 2. The back pressure chamber 20 is formed between the back pressure chamber 20 and the fuel passage 11 by a small-diameter orifice 21. Is in communication. The upper end surface of the hydraulic command piston 18 is a pressure receiving surface 22, and a pressure receiving area 22 S of the pressure receiving surface 22 is larger than a pressure receiving area 17 S of the pressure receiving portion 17 of the needle valve 5.

Further, on the opposite side of the back pressure chamber 20 from the orifice 21, a leak hole 23 communicating with the back pressure chamber 20 is formed. The leak hole 23 is provided with a solenoid valve 24 for a needle valve.
(The needle valve control valve, a two-way valve, described later) can communicate with the leak passage 25. However, the leak hole 23
Is larger than the cross-sectional area of the flow passage of the orifice 21, and when the leak hole 23 is opened, the back pressure chamber 2
0 is returned to the fuel tank 7 side through the leak hole 23 and the leak passage 25 to reduce the pressure, and the fuel passage 1
The pressure receiving portion 17 of the needle valve 5 from 1 is maintained in a high pressure state.

As shown in FIG. 1, the injection hole variable mechanism 6 includes a rotary solenoid 26 (rotary valve actuator) and a drive shaft 27 attached to the rotary solenoid 26 and extending to the tip of the needle valve 5.
And a rotary valve 28 facing the injection hole 14 in the hole 13 of the nozzle body 3, and a control circuit 29. The rotary solenoid 26 is connected to the drive shaft 2
A rotary angle detector 30 is provided for rotating the rotary valve 28 to a predetermined angle via the control unit 7, and the drive thereof is controlled by a control circuit 29.

In a portion where the drive shaft 27 is attached to the rotary actuator 26, a portion between the drive shaft 27 and the nozzle housing 2 and between the drive shaft 27 and the back pressure chamber 20 of the hydraulic command piston 18 is provided. An O-ring 31 (seal member) is provided to prevent leakage of fuel from the back pressure chamber 20 along the outer peripheral portion of the drive shaft 27.

The solenoid valve 24 for a needle valve is provided as a two-way valve in the solenoid housing 4 at a position lateral to the rotary solenoid 26 (the side opposite to the fuel introduction section 10 in FIG. 1). The needle valve solenoid valve 24 controls the back pressure of the hydraulic command piston 18 (the pressure in the back pressure chamber 20), and includes a linear solenoid 32 (needle valve actuator), a solenoid valve core 33, and a two-way valve. Valve shaft 34 (armature) and valve spring 35
And a control circuit 29 in the injection hole variable mechanism 6.

The front end seat portion 36 of the two-way valve shaft 34 is seated on a seat portion 37 at an outlet portion of the leak hole 23 communicating with the back pressure chamber 20 of the nozzle housing 2 so that the leak hole 23 can be opened and closed. That is, the linear solenoid 3 based on the control signal from the control circuit 29
2 excites the two-way valve shaft 34 in the direction of the solenoid valve core 33 against the urging force of the valve spring 35 (FIG. 1).
When it is sucked and lifted in the middle and right side directions), the leak hole 2
3 is opened, and the fuel in the back pressure chamber 20 is returned to the low pressure portion (fuel tank 7) through the leak hole 23 and the leak passage 25.

The drive shaft 2 of the injection hole variable mechanism 6
Numeral 7 denotes a solenoid valve core 33, a two-way valve shaft 34, and a leak hole 2 of the linear solenoid 29 in the needle valve solenoid valve 24 passing through the rotary solenoid 26.
3, that is, without intersecting with the solenoid valve 24 for the needle valve, through the back pressure chamber 20, from the top of the nozzle housing 2 to the hydraulic command piston 18 and the through-shaft hole 38 of the needle valve 5. It is inserted inside and reaches the rotary valve 28 below it.

As shown in FIG. 2, the drive shaft 27
The drive shaft 27 and the rotary valve 28 are connected by a rotation connection concave portion 39 at the distal end thereof and a rotation connection projection 40 of the rotary valve 28, and the drive shaft 27 and the rotary valve 28 are connected to each other. The drive shaft 27 is connected to the rotary valve 28 so as to be movable in the axial direction (with play) and to transmit the rotational movement of the drive shaft 27 to the rotary valve 28. A connection portion between the drive shaft 27 and the rotary valve 28, specifically, a coil spring 43 is provided between a distal end surface 41 of the drive shaft 27 and an upper end surface 42 of the rotary valve 28.
(Elastic member), the rotary valve 2
8 is urged in the axial direction of the drive shaft 27, specifically, in the direction of the seat surface 16 of the nozzle body 3, and the rotary valve 28 is pressed against the injection hole 14 so that the relative position thereof can be fixed. Instability due to play between the moving connecting concave portion 39 and the rotating connecting convex portion 40 is avoided.

The rotary valve 28 is located below the needle valve 5, is capable of seating on the seat surface 16 in the hole 13, has a substantially conical shape tapered downstream, and is capable of closing the injection hole 14. And a variable groove portion 45 between the sheet circular arc portion 44 and the communication with the injection hole 14.
(In the illustrated example, five each).

When the needle valve 5 is seated or lifted, the rotary valve 28 can rotate around its axis independently of the needle valve 5.
8 is closed when the seat arc portion 44 faces the injection hole 14. When the variable groove 45 faces the injection hole 14, the lift of the needle valve 5 allows the fuel passage 11 and the injection hole 14 to be changed. Communication becomes possible via the groove 45.

As shown in FIG. 3, the rotary valve 28
Is rotated clockwise or counterclockwise to change the relative position of the variable groove 45 of the rotary valve 28 with respect to the injection hole 14 in the hole 13 of the nozzle body 3, and to set the opening degree (opening) of the injection hole 14. (Cross-sectional area) is variable.

In the variable injection hole type fuel injection nozzle 1 and the injection hole variable mechanism 6 having such a configuration, the fuel from the fuel introduction portion 7 and the fuel passage 11 acts on the pressure receiving portion 17 of the needle valve 5 in the fuel reservoir 9. The needle valve 5 is urged in the lift direction, and the pressure receiving surface 22 of the hydraulic command piston 18 is pressed downward in the back pressure chamber 20 through the orifice 21 on the upstream side in the figure, thereby urging the needle valve 5 in the seat direction. I do. However, when the linear solenoid 32 is in the demagnetized state, the front seat 36 of the two-way valve shaft 34 is moved by the urging force of the valve spring 35 to the seat 3.
7 to close the leak hole 23, the pressure in the back pressure chamber 20 is high, and the difference between the pressure receiving area of the pressure receiving surface 22 and the pressure receiving area of the pressure receiving portion 17 (the former is larger). The needle valve 5 remains seated on the seat surface 16 of the nozzle body 3, and the injection from the injection hole 14 is not performed.

When the drive shaft 27 is rotated by a predetermined angle by the rotary solenoid 26 in the injection stop state, the relative position between the variable groove 45 of the rotary valve 28 and the seat circular arc 44 and the injection hole 14 is adjusted. The injection hole cross-sectional area of the injection hole 14 can be made variable.

When the two-way valve shaft 34 is lifted from the leak hole 23 by the excitation of the linear solenoid 32, the back pressure chamber 20 is moved from the fuel introduction section 7 through the orifice 21.
Reaches the low pressure side through the leak hole 23 and the leak passage 25, the back pressure chamber 20 becomes low pressure, and the needle valve 5 receiving the fuel pressure in the pressure receiving portion 17
Is lifted from the seat surface 16 of the nozzle body 3 and the nozzle hole 1
4 is performed. Note that, even in this fuel injection state, the drive shaft 27 is operated by the rotary solenoid 26 to rotate the rotary valve 28 to the injection hole 1.
The nozzle can be rotated with respect to 4, so that the cross-sectional area of the injection hole is variable, and the spray characteristics can be adjusted even during injection.

The driving force of the drive shaft 27 is applied during the fuel injection when the needle valve 5 is lifted and when the rotary valve 28 is rotated.
The rotary valve 28 received at the portion 9 and the connecting projection 40 for rotation is arranged in a state of being protruded between the distal end surface 41 of the drive shaft 27 and the hole 13 or the seat surface 16 of the nozzle body 3 by the coil spring 43. Therefore, the rotary valve 28 is stably positioned in the hole 13 in a fixed state, and the relative position between the rotary valve 28 and the injection hole 14 is stably maintained. Characteristics can be stabilized.

In the variable injection hole type fuel injection nozzle 1, the rotary valve 28 is provided separately from the drive shaft 27, but these may be integrated. That is, FIG. 4 shows an injection hole variable mechanism 46 as a modification.
FIG. 3 is an enlarged sectional view showing a main part of the nozzle hole variable mechanism 46;
The variable injection hole type fuel injection nozzle 1 incorporates a rotary valve 47 in which the drive shaft 27 and the rotary valve 28 are integrated.

The tip cone 48 of the rotary valve 47 seats on the seat surface 16 of the nozzle body 3, and the variable groove 49 formed in the tip cone 48 faces the injection hole 14 and is positioned relative to the injection hole 14. Thus, the aperture can be made variable.

In the injection hole variable mechanism 46 having such a configuration, the cross-sectional area (opening degree) of the injection hole 14 can be arbitrarily changed, and the drive shaft 27 and the rotary valve can be arranged as shown in FIG. There is no need to provide a coil spring 43 between the hole 13 and the fuel flow in the hole 13. Further, the number of parts is small, and the degree of opening of the injection hole 14 can be variably controlled more precisely.

Thus, the variable injection hole type fuel injection nozzle 1 is provided with the injection hole variable mechanism 6 together with the needle valve solenoid valve 24, and both of them are driven and controlled by the control circuit 29, thereby controlling the lift of the needle valve 5. , And the opening degree of the injection hole 14 can be controlled together,
The fuel injection device having the common rail 9 and the like can also include the injection hole variable mechanism 6 and the injection hole variable mechanism 46.

FIG. 5 is an enlarged sectional view of a main part of a variable injection hole type fuel injection nozzle 50 according to a second embodiment of the present invention. A needle valve solenoid valve 51 (needle valve control valve) having a three-way valve configuration is provided in place of the needle valve solenoid valve 24 (FIG. 1).

That is, the solenoid valve 51 for a needle valve is provided in a solenoid housing 52, and includes a linear solenoid 53, an electromagnetic valve core 54, a spool valve 55 corresponding to the two-way valve shaft 34, and a valve spring 56. And a play preventing spring 57.

The solenoid housing 52 has a center hole 58 that slidably accommodates the spool valve 55, a first communication hole 59 (back pressure leak port) communicating with the center hole 58, and an annular hole 60. A second communication hole 62 (fuel pressure supply port) communicating the fuel communication passage 61 communicating with the fuel passage 11 and the center hole 58, and a leak passage 63 (discharging) communicating the center hole 58 with the fuel tank 7. Port) and
Is formed. Further, the back pressure chamber 20 and the first communication hole 59 are communicated by the orifice 64. The fuel communication passage 61 communicates the fuel passage 11 with the second communication hole 62. However, the fuel communication passage 61 bypasses the hydraulic command piston 18 and the drive shaft 27 and does not intersect with the hydraulic command piston 18 and the drive shaft 27. This is formed.

The spool valve 55 has a first land 65.
And the second land 66, and in a normal state, the linear solenoid 53 is demagnetized so that the first land 65
Closes the first communication hole 59 and maintains the back pressure in the back pressure chamber 20.

In the variable injection hole type fuel injection nozzle 50 having such a configuration, when the linear solenoid 53 is excited, the spool valve 5 is pressed against the urging force of the valve spring 56.
5 moves downward in FIG. 5, the annular hole 60 and the leak passage 63 communicate with the low pressure side (fuel tank 7) via the orifice 64 and the first communication hole 59, and the back pressure in the back pressure chamber 20 decreases. Thus, the needle valve 5 can be lifted.

When the linear solenoid 53 is demagnetized, the spool valve 55 returns to the state shown in FIG. 5, and the fuel communication passage 61, the second communication hole 62, the annular hole 60, the first communication hole 59 and the orifice 64 are closed. The fuel pressure from the fuel introduction unit 10 is supplied into the back pressure chamber 20 through the needle valve 5.
Can be seated.

Thus, also in the variable injection hole type fuel injection nozzle 50 provided with the three-way needle valve solenoid valve 51, the opening and closing of the needle valve 5 can be controlled and the opening degree of the injection hole 14 can be made variable. The present invention can be applied to a fuel injection system having the common rail 9.

Further, in the case of the two-way valve solenoid valve 24 shown in FIG. 1, the orifice 21 and the leak hole 23 are located upstream and downstream of the back pressure chamber 20, respectively.
When the solenoid valve for needle valve 24 is energized, the fuel from the fuel passage 11 to the back pressure chamber 20 is released to the low pressure side when the needle valve solenoid valve 24 is energized, so that the pressure in the back pressure chamber 20 is adjusted more than necessary. Is leaked to the low pressure side, but the three-way valve solenoid valve 51 shown in FIG.
Since the back pressure chamber 20 communicates only with the orifice 64, only the back pressure chamber 20 communicates with the low pressure side when the solenoid valve 51 for the needle valve is energized, so that the fuel leaks more than necessary. Absent.

In the present invention, as the control valve for the needle valve, the above-described two-way valve configuration (the solenoid valve 2 for the needle valve) is used.
4) In addition to the three-way valve configuration (the solenoid valve 51 for a needle valve), a piezoelectric element or the like that contracts slightly by applying a voltage can be adopted. By controlling the voltage application to the piezoelectric element, pilot injection or pilot injection can be performed. Multi-stage injection is also possible.

[0046]

As described above, according to the present invention, the control valve for the needle valve for driving the needle valve is located at, for example, the lateral position so as not to intersect the drive shaft with respect to the actuator for driving the rotary valve. Fuel leakage can be reduced, and the invention is also applicable to a fuel injection system having a common rail.

[Brief description of the drawings]

FIG. 1 is a sectional view of a variable injection hole type fuel injection nozzle 1 according to a first embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a part II of FIG.

FIG. 3 is an enlarged sectional view taken along line III-III of FIG. 2;

FIG. 4 is an enlarged sectional view showing a main part of an injection hole variable mechanism 46 as a modification.

FIG. 5 is an enlarged sectional view of a main part of a variable injection hole type fuel injection nozzle 50 according to a second embodiment of the present invention.

[Explanation of symbols]

Reference Signs List 1 variable injection hole type fuel injection nozzle (first embodiment, FIG. 1) 2 nozzle housing 3 nozzle body 4 solenoid housing 5 needle valve 6 injection hole variable mechanism of variable injection hole type fuel injection nozzle 1 7 fuel tank 8 fuel Pump 9 Common rail 10 Fuel introduction part 11 Fuel passage 12 Fuel reservoir 13 Hole 14 Injection hole 15 Seat part of needle valve 5 16 Seat surface of nozzle body 3 17 Pressure receiving part of needle valve 5 17S Pressure receiving area of pressure receiving part 17 (17S < 22S) 18 hydraulic command piston 19 valve spring 20 back pressure chamber 21 orifice 22 pressure receiving surface of hydraulic command piston 22 22S pressure receiving area of pressure receiving surface 22 23 leak hole 24 solenoid valve for needle valve (needle valve control valve, two-way valve) 25 Leak passage 26 Rotary solenoid (for rotary valve) Actuator) 27 Drive shaft 28 Rotary valve 29 Control circuit 30 Rotation angle detector 31 O-ring (seal member) 32 Linear solenoid (needle valve actuator) 33 Solenoid valve core 34 Two-way valve shaft (armature) 35 Valve spring 36 Two Tip seat portion of one-way valve shaft 34 37 Seat portion of leak hole 23 38 Penetrating shaft hole of needle valve 5 39 Rotating connecting concave portion at the tip of drive shaft 27 40 Rotating connecting convex portion of rotary valve 28 41 Drive shaft 27 42 Top end surface of rotary valve 28 43 Coil spring (elastic member) 44 Seat arc portion of rotary valve 28 Variable groove portion of rotary valve 46 Injection hole variable mechanism (modification, FIG. 4) 47 Rotor Barubu 48 variable groove 50 variable injection hole type fuel injection nozzle (the second embodiment of the distal conical portion 49 distal conical portion 48 of the rotary valve 47,
5) 51 solenoid valve for needle valve (control valve for needle valve, three-way valve) 52 solenoid housing 53 linear solenoid 54 solenoid valve core 55 spool valve 56 valve spring 57 backlash prevention spring 58 central hole 59 first communication hole (back) 60 annular hole 61 fuel communication passage 62 second communication hole (fuel pressure supply port) 63 leak passage (discharge port) 64 orifice 65 first land of spool valve 55 66 second land of spool valve 55

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Takashi Kobayashi 3-13-26, Yayumicho, Higashimatsuyama-shi, Saitama Prefecture Inside Zexel Higashimatsuyama Plant (72) Inventor Tatsuya Sejima 3--13, Yayumicho, Higashimatsuyama-shi, Saitama No. 26 F-term in Zexel Higashi-Matsuyama Plant (Reference) 3G066 AA07 AB02 AC09 AD12 BA03 BA12 BA35 CC06T CC08T CC14 CC23 CC26 CC48 CC64T CC66 CC67 CC68U CC70 CD26 CE22 CE34 DC03

Claims (5)

[Claims] An injection hole having a predetermined injection hole cross-sectional area and a nozzle body having a sheet surface connected to the injection hole; a nozzle body provided reciprocally in the nozzle body, and lifted from the sheet surface. A needle valve capable of injecting fuel from the injection hole, a rotary valve capable of adjusting a relative position with respect to the injection hole, an actuator for rotating the rotary valve, and transmitting a driving force of the actuator to the rotary valve A variable injection hole type fuel injection nozzle capable of changing the injection hole cross-sectional area of the injection hole by rotating the rotary valve by the actuator via the drive shaft. A hydraulic command piston for urging the needle valve in the valve closing direction; A control valve for a needle valve for controlling the back pressure of the needle, and the control valve for the needle valve is provided at a position not intersecting with the drive shaft. nozzle. 2. The variable injection hole type fuel injection nozzle according to claim 1, wherein said needle valve control valve is provided at a lateral position of said actuator. 3. The variable injection hole type fuel injection nozzle according to claim 1, wherein a seal member is provided at a portion between the drive shaft and the back pressure chamber of the hydraulic command piston. 4. The variable injection hole type fuel injection nozzle according to claim 1, wherein the control valve for the needle valve is a two-way valve. 5. The variable injection hole type fuel injection nozzle according to claim 1, wherein the needle valve control valve is a three-way valve.