JPH1068365A - Electronic control hydraulically-driven fuel injection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To excellently mount a manifold to store working fluid and an injector body without being influenced by thermal expansion. SOLUTION: A fuel injection device is formed such that a manifold 56 fixed at a cylinder head and storing working fluid in a state pressurized to a given pressure and an injector body forming a pressure chamber to which working fluid is fed are intercoupled through a feed pipe 15. A working fluid feed passage formed in the injector body and the oil feed port 88 of the manifold 56 are intercommunicated through the through-hole 89 of the feed pipe 15. The ring part 92 of the feed pipe 15 is mounted in a state that the ring part 92 of the feed pipe 15 is fitted in the manifold 56 so that the feed pipe 15 is axially relatively movable to the manifold 56.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronically controlled hydraulically driven fuel injection device for injecting fuel by boosting fuel in a booster chamber supplied from a common rail by a booster piston operated by a working fluid from a manifold. About.

[0002]

2. Description of the Related Art Conventionally, as a hydraulically operated electronically controlled fuel injection device for an engine, there have been disclosed, for example, JP-A-6-294362 and JP-A-6-511524. These fuel injection devices variably control the fuel flow rate characteristics of the hydraulically operated injectors during the fuel injection stroke of the engine and enable quick start-up. For example, as shown in FIG. It has a structure.

[0003] As shown in FIG. 23, a fuel injection device 1 comprises:
It comprises a main body having a hollow hole and an injection port 13 formed therein, and a case 6 arranged with a gap formed so as to form a fuel chamber 20 outside the main body. The main body of the fuel injection device 1 includes a nozzle main body 2 having a hollow hole 46 and having an injection port 13 formed therein, a fuel supply main body (plunger barrel) 5 forming a pressure-intensifying chamber 7, and a connection between the nozzle main body 2 and the fuel supply main body 5. A hollow spacer body 21 having a spacer body 81 and a hollow hole 29 located therebetween, and a pressure chamber 8 to which high-pressure hydraulic oil is supplied.
And a solenoid body 3 having a drain groove 39 as a leak passage and a drain passage 38 and having a solenoid valve 16 disposed therein. The case 6 includes the nozzle body 2, the spacer body 81, and the hollow spacer body 21 to form the fuel chamber 20.
And the fuel supply body 5. The case 6 has a fuel chamber 20 formed between the case 6 and one end of the case 6.
And the other end is sealed by a fitting surface 80 screwed into the injector body 4. A fuel supply port 11 and a fuel discharge port 12 formed in the case 6 are opened in the common rail 51, and fuel is constantly supplied from the common rail 51 to the fuel chamber 20.

[0004] The fuel injection device 1 is for increasing the pressure of the fuel supplied from the fuel chamber 20, a pressure increasing chamber 7 formed in a fuel supply main body 5, and for supplying fuel from the pressure increasing chamber 7 to the injection port 13. , Spacer body 81, hollow spacer body 21
A fuel passage 22 formed in the nozzle body 2, a needle valve 23 slidably held in a hollow hole 46 of the nozzle body 2 to open the injection port 13 by fuel pressure, and a pressure increasing chamber for increasing the pressure of the fuel in the pressure increasing chamber 7. The pressure piston 9 includes a pressure chamber 8 to which high-pressure hydraulic oil for supplying high pressure is supplied to an end of the pressure-increasing piston 9, and a solenoid valve (control valve) 16 for controlling the supply of the high-pressure hydraulic oil to the pressure chamber 8. ing.

The return spring 18 is disposed in a hollow hole 29 formed in the hollow spacer body 21 and
A spring force is applied to the needle valve 23 in a direction to close the needle valve 3. One end of the return spring 18 contacts the upper end of the needle valve 23,
The other end is in contact with the spacer body 81. The hollow spring chamber 30 formed by the hollow hole 26 formed in the injector main body 4 is formed between the end face of the large-diameter portion 25 of the pressure-intensifying piston 9 and the end face of the fuel supply main body 5. A return spring 17 for urging the pressure-intensifying piston 9 toward the pressure chamber 8 is disposed in the spring chamber 30. In a hollow hole 85 formed in the injector main body 4, a return spring 19 for urging the solenoid valve 16 on the side where the operating oil is cut is arranged. The spring chamber 30 in which the pressure-intensifying piston 9 is disposed includes a discharge passage 83 formed in the fuel supply main body 5 and a check valve 8 disposed in the discharge passage 83.
4 communicates with the fuel chamber 20. Normally, the leaked fuel enters the spring chamber 30 and is in a state equivalent to the fuel pressure in the fuel chamber 20.
And a void is formed.

The pressure-intensifying piston 9 has a small-diameter portion 24 which is a plunger that forms a part of the pressure-increasing chamber 7 at the lower end surface, a part of the pressure chamber 8 that is formed at the upper end surface, and a hollow hole 26 of the injector body 4. , And a guide ring portion 41 that hangs down from the entire periphery of the outer peripheral portion of the large diameter portion 25 and forms a sliding surface that slides on the inner surface of the hollow hole 26. The guide ring portion 41 has a function of stabilizing the vertical movement of the pressure-intensifying piston 9. Small-diameter portion 2 of booster piston 9
4 reciprocates in a hollow hole 42 formed in the fuel supply main body 5, and the large diameter portion 25 reciprocates in a hollow hole 26 formed in the injector main body 4. A seal member 44 is disposed in the hollow hole 26 formed in the injector body 4, and seals a gap between the pressure-intensifying piston 9 and the hollow hole 26 with the seal member 44. The spring chamber 30 and the pressure chamber 8 are shut off so that the working oil does not leak into the spring chamber 30.

[0007] At the end of the hollow hole 42 formed in the fuel supply main body 5, a pressure increasing chamber 7 is formed. The fuel is supplied to the pressure intensifying chamber 7 from the fuel chamber 20 through the hollow spacer body 2.
1 through the fuel passage 37 formed in the spacer body 81. In the fuel passage 35,
A check valve 36 is incorporated to prevent the high pressure fuel in the pressure intensifying chamber 7 from flowing back into the fuel chamber 20. Also,
The fuel whose pressure has been increased in the pressure increasing chamber 7 is supplied to the injection port 13 through the fuel passage 22 formed in the spacer main body 81, the hollow spacer main body 21, and the nozzle main body 2. A fuel passage is formed between the nozzle body 2 and the needle valve 23, and the needle valve 2
The needle valve 23 is lifted by applying a high fuel pressure to the tapered surface 45 at the end of the needle 3. The needle valve 23 is slidably held in the hollow hole 46 of the nozzle body 2, lifted by fuel pressure, and opens the injection port 13.

The pressure-increasing piston 9 has a flat surface 73 in which an outer peripheral portion of a top surface 65 of the large-diameter portion 25 facing the pressure chamber 8 is cut off.
Is formed. The wall surface of the injector body 4 forming the pressure chamber 8 is formed as a flat surface 72 parallel to the top surface 65 of the pressure increasing piston 9. Therefore, in the pressure chamber 8, a narrow annular gap 74 is formed between the flat surface 73 of the pressure-intensifying piston 9 and the flat surface 72 of the injector body 4. The pressure-increasing piston 9 has a top surface 6.
The central projection of 5 is in contact with the flat surface 72 of the injector body 4 by the spring force of the return spring 17.

In the fuel injection device 1, a spring chamber 30 accommodating the return spring 17 is formed in a hollow hole 26 formed in the injector body 4 in which the large-diameter portion 25 of the pressure-intensifying piston 9 and the guide ring portion 41 slide. Have been. The fuel that has entered the spring chamber 30 passes through a discharge passage 83 formed in the fuel supply main body 5, and is supplied to the fuel chamber 2.
It is configured to discharge to zero. In the spring chamber 30 in which the return spring 17 of the pressure-intensifying piston 9 is disposed, a gap around the plunger of the small-diameter portion 24, that is, a sliding surface between the hollow hole 42 of the fuel supply main body 5 and the outer peripheral surface of the small-diameter portion 24. The fuel from the fuel chamber 20 leaks and enters through the gap 28 and the contact surface between the injector body 4 and the fuel supply body 5. The fuel that has entered the spring chamber 30 is discharged to the fuel chamber 20 through the discharge path 83. Since the check valve 84 is provided in the discharge path 83, the fuel is prevented from flowing back from the fuel chamber 20 to the spring chamber 30 through the discharge path 83. Normally, a space corresponding to the stroke of the pressure-intensifying piston 9 is formed in the spring chamber 30, and fuel enters. Then, when the fuel enters to such an extent that the empty space in the spring chamber 30 becomes equal to or less than the stroke of the booster piston 9, the fuel existing in the spring chamber 30 in the hollow hole 26 is discharged as the booster piston 9 reciprocates. Although it can be discharged to the fuel chamber 20 through the passage 83, the check valve 84 prevents the backflow.

FIG. 22 shows a fuel supply system for an internal combustion engine in which the fuel injection device 1 is incorporated. In the fuel supply system, a fuel injection device 1 is provided for each cylinder of the engine. The fuel injection device 1 is provided with a common rail 51 which is a common passage for supplying fuel. Common rail 51
The fuel in the fuel tank 52 is supplied through the fuel filter 54 by the driving of the fuel pump 53. The common rail 51 communicates with each fuel injection device 1 and has a fuel recovery passage 5.
5 and is collected in the fuel tank 52. That is, in the fuel injection device 1, the fuel supply port 11 and the fuel discharge port 12 are disposed on the common rail 51 to which fuel of a predetermined pressure is constantly supplied.

The fuel injection device 1 is configured to supply a high-pressure working fluid, that is, working oil, to the pressure chamber 8 to increase the fuel pressure. The fuel injection device 1 is connected to the high-pressure oil manifold 56, respectively. Oil from an oil reservoir 57 is supplied to the high-pressure oil manifold 56 through an oil supply path 61 by operation of an oil pump 58, and an oil cooler 59 and an oil filter 60 are provided in the oil supply path 61. The oil supply passage 61 branches into a lubrication system passage 67 leading to the oil gallery 62 and a working oil system passage 66 supplied to the pressure chamber of the fuel injection device 1. A high-pressure oil pump 63 is provided in the working oil system passage 66, and the supply of oil from the high-pressure oil pump 63 to the high-pressure oil manifold 56 is controlled via a flow control valve 64. The controller 50 is configured to control the flow control valve 64 and control the solenoid 10 of the fuel injection device 1. The controller 50 receives, as the operating state of the engine, the engine speed detected by the rotation sensor 68, the accelerator opening detected by the load sensor 69, and the crank angle detected by the position sensor 70.
The controller 50 includes a high-pressure oil manifold 5.
The working oil pressure of the high-pressure oil manifold 56 detected by the pressure sensor 71 installed at 6 is input.

In the fuel injection device 1, the opening / closing operation of the nozzle 13 by the needle valve 23 is performed by controlling the solenoid 10. When the solenoid 10 is energized by a command from the controller 50, the armature 32 is turned on. Solenoid valve 1 that is adsorbed and fixed to armature 32
6 lifts against the spring force of the return spring 19. When the solenoid valve 16 is lifted, the solenoid valve 1
6, a passage 33 formed between the tapered surface 86 of the injector body 4 and the valve seat 87 of the injector body 4 is opened, and the high-pressure hydraulic oil is supplied from the high-pressure oil manifold 56 through the supply path 31 and the passage 34 formed in the injector body 4 through pressure. Room 8
Supplied to When high-pressure hydraulic oil is supplied to the pressure chamber 8, high-pressure hydraulic oil is supplied to an annular gap 74 formed between the top surface 65 of the large-diameter portion 25 of the pressure-intensifying piston 9 and the wall surface (flat surface) 72 of the injector body 4. The working oil is supplied, and the working pressure is urged to the pressure increasing piston 9. The fuel of the common rail 51 is supplied to the fuel chamber 20 from the supply port 11 formed in the case 6, and then the fuel passage 37 formed in the hollow spacer body 21 and the fuel passage 35 formed in the spacer body 81 from the fuel chamber 20. The pressure is supplied to the pressure-intensifying chamber 7.

When the pressure-increasing piston 9 is lowered by the pressure of the working oil in the pressure chamber 8, the fuel passage 35 is closed by the check valve 36, and the pressure in the pressure-increasing chamber 7 is increased. Booster chamber 7
When the pressure of the fuel is increased, the fuel pressure is
The needle valve 23 is lifted against the spring force of No. 8. Further, when the urging force of the solenoid 10 to the solenoid valve 16 is released, the solenoid valve 16 is lowered by the spring force of the return spring 19, and the drain groove 3 provided in the solenoid valve 16 is provided.
9 is opened, and the high-pressure hydraulic oil in the pressure chamber 8 is
And discharged through the drain passage 38. When the high-pressure hydraulic oil in the pressure chamber 8 is discharged, the pressure-intensifying piston 9 returns to the original pressure by the spring force of the return spring 17, and the pressure in the pressure-increasing chamber 7 becomes equal to the pressure of the fuel chamber 20, and is applied to the needle valve 23. The fuel pressure is reduced, and the taper surface 45 of the needle valve 23 is seated on the valve seat of the nozzle body 2 by the spring force of the return spring 18 and the injection port 13 is closed.

[0014]

However, in the conventional electronically controlled hydraulically driven fuel injection device, the working fluid manifold and the fuel supply passage are formed integrally with the cylinder head, thereby reducing the number of parts and reducing the size. However, in the above-described fuel injection device, when the cylinder head is made of an aluminum alloy to reduce the weight of the engine, the cylinder head cannot withstand the internal pressure of the manifold (20 to 40 MPa). It deforms and deteriorates the gas sealing performance of the contact surface between the cylinder head and the cylinder block, causing gas leakage, and supporting parts (valves for various driving parts (intake and exhaust valves, camshafts, etc.) attached to the cylinder head). (Stems, bearings, etc.) are stressed to increase friction, causing uneven wear and galling.

Therefore, as shown in FIG. 21, the applicant of the present invention has made a cylinder head 75 made of an aluminum alloy and a manifold 56 made of a highly rigid material such as FC cast iron as shown in FIG. Produced. The fixing surface 43 of the flange 77 is fixed to the fixing surface 82 of the cylinder head 75.
Of the cylinder head 75
At a position via a flange 77. In order to supply a working fluid from the manifold 56 to the injector main body 4, the injector main body 4 and the manifold 56 are connected by a supply pipe 78. Although not shown, the injector body 4 uses a clamp and a bolt to hold the shoulder 79 of the injector (corresponding to the case 6 in FIG. 23) to the cylinder head 75.
Is fixed to the cylinder head 75 by pressing with a packing 49 interposed therebetween. At this time, the seal of the fuel passage (corresponding to the common rail 51 in FIG. 22) formed in the cylinder head 75 and the gas seal in the cylinder are achieved.

However, since the cylinder head 75 made of aluminum and the manifold 56 made of FC cast iron have different coefficients of thermal expansion, a difference in thermal expansion between the cylinder head 75 and the manifold 56 occurs with the operation of the engine. I do. Since the injector main body 4 is fixed to the cylinder head 75, a connection system between the manifold 56, the support member 77 and the cylinder head 75, the injector main body 4 and the cylinder A relative displacement occurs in the connection system with the head 75, and accordingly, a relative displacement occurs between the manifold 56 and the injector body 4.

Specifically, during high-load operation in which the engine is operated and the engine is heated to a high temperature, a difference is generated between the cylinder head 75 and the manifold 56 due to the difference in thermal expansion in the engine longitudinal direction, that is, the crankshaft direction. In the injector body 4 fixed to the cylinder head 75, the connection between the supply pipe 78 extending from the manifold 56 and the injector body 4 is deformed to cause oil leakage, so that the operating oil from the manifold 56 There is a problem that the fuel is not supplied to the supply path 31 of the main body 4 and the fuel cannot be injected.

Similarly, during high load operation when the engine is at a high temperature, the thermal expansion of the cylinder head 75 and the manifold 56 in the engine lateral direction, that is, in the direction orthogonal to the manifold axis (the direction orthogonal to the crankshaft). A difference occurs in the extension amount due to the difference, the injector body 4 is tilted with respect to the injector body 4 fixed to the cylinder head 75, the seal portion between the injector body 4 and the cylinder head 75 is damaged, and the common rail 51 and the Leakage of fuel or gas from the combustion chamber, or deformation of the connection between the supply pipe 78 extending from the manifold 56 and the injector body 4, oil leakage of the working fluid from the working fluid system, Therefore, the working oil from the manifold 56 is not supplied to the supply path 31 of the injector body 4 and the fuel injection A problem that can not be carried out has occurred.

When the injector main body 4 is mounted on the cylinder head 75, the mounting height of the injector main body 4 is regulated by the positional relationship between the connecting portion between the supply pipe 78 and the injector main body 4. Therefore, the pressing force against the packing 49 by the shoulder portion 79 is insufficient, and the cylinder head 75
The fuel leakage from the fuel passage formed in the cylinder and the gas leakage in the cylinder occur. Also, the fixing surface 94 of the shoulder 79 of the injector with respect to the cylinder head 75 and the manifold 5
Since the height position of the fixing surface 82 of the cylinder head 75 abutting on the fixing surface 43 of the flange 77 supporting the cylinder 6 differs, the fixing surface 94 of the shoulder portion 79 of the injector and the manifold 56 fixed surfaces 4
3, a relative displacement occurs.

Specifically, when the lower surface 76 of the cylinder head 75 is used as a reference surface during a high-load operation in which the engine is at a high temperature, the fixing surface 94 of the shoulder 79 of the injector body 4 and the fixing surface 43 of the manifold 56 The fixed surface 43 of the manifold 56 extends longer than the fixed surface 94 of the injector and becomes higher than that at room temperature, so that the supply pipe 78 fixed to the manifold 56 and the injector main body 4 extend. 23, the connection portion is deformed, the connection portion is deformed, oil leakage of the working fluid occurs, and the working fluid passage formed in the injector body 4 (reference numeral 3 in FIG. 23)
No. 1, 33, 34), the working fluid is not supplied, and the fuel injection cannot be performed.

[0021]

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problem, and a high-pressure working fluid drives a pressure-intensifying piston in a main body to supply fuel in a pressure-intensifying chamber supplied from a common rail. In an electronically controlled hydraulically driven fuel injection device that increases pressure and injects fuel, a main body having a pressure chamber is attached to a manifold that stores a working fluid through a supply pipe, and the working fluid between the main body and the manifold is supplied through the supply pipe. An electronic device that allows good fuel injection by allowing relative movement between the main body and the manifold due to the thermal expansion difference generated by the thermal expansion of the cylinder head at the connection of the supply pipe while preventing the supply path from shifting. An object of the present invention is to provide a control hydraulic drive type fuel injection device.

Another object of the present invention is to solve the above-described problem. The high-pressure working fluid drives a pressure-intensifying piston in an injector, and the fuel in a pressure-intensifying chamber supplied from a common rail is pressurized to increase the fuel. In an electronically controlled hydraulically driven fuel injection device for injection, an injector having a pressure chamber is attached to a manifold for storing a working fluid via a supply pipe, and the cylinder head is moved according to the amount of thermal expansion generated by the thermal expansion of the cylinder head. The manifold is slidably attached to the cylinder to prevent displacement of the supply path of the working fluid between the injector and the manifold, prevent the injector from tilting with respect to the cylinder head, and supply working fluid and fuel from the working fluid supply system. Electronically controlled hydraulically driven fuel that prevents fuel and gas leakage from the system and combustion chamber and enables good fuel injection It is to provide an injection device.

Still another object of the present invention is to solve the above-mentioned problem. The high-pressure working fluid drives a pressure-intensifying piston in an injector, and the fuel in a pressure-intensifying chamber supplied from a common rail is pressurized to increase the fuel. In an electronically controlled hydraulically driven fuel injection device that injects, an injector that forms a pressure chamber is attached to a manifold that stores the working fluid via a supply pipe, and the amount of thermal expansion generated by the thermal expansion of the cylinder head and the manifold is increased. Even if the cylinder head and the manifold move relative to each other, the spring member bends and absorbs the relative movement to allow relative movement between the two, thereby preventing displacement of the supply path of the working fluid between the injector and the manifold. Prevents the injector from tilting with respect to the cylinder head, and prevents the working fluid from the working fluid supply system and the fuel from the fuel supply system and the combustion chamber. To prevent leakage of or gas, is to provide a fuel injection system of electronically controlled hydraulic-powered which enables a good fuel injection.

According to the present invention, there is provided a manifold which is attached to a cylinder head and stores a working fluid in a state where the working fluid is pressurized to a predetermined pressure. The manifold is formed in a main body attached to the cylinder head and supplied with fuel from a common rail. A pressure chamber, a pressure chamber formed in the main body, which is supplied from the manifold with the working fluid that drives a pressure boosting piston that boosts the fuel in the pressure boosting chamber, and the pressure of the working fluid that drives the pressure boosting piston. In an electronically controlled hydraulically driven fuel injection device having a control valve for electronically controlling the supply to the chamber and a needle valve for opening and closing a nozzle for injecting fuel from the pressure intensifying chamber, the main body communicating with the pressure chamber is The formed working fluid supply passage and the working fluid supply port of the manifold communicate with each other via a supply pipe, and the manifold and the main body are connected to the manifold and the manifold. Body to be at least possible one axial movement relative to an electronic control hydraulic drive type fuel injection system, characterized in that fitted with the supply pipe to the manifold and the main body.

Further, the supply pipe has a through-hole communicating the working fluid supply passage of the main body with the working fluid supply port of the manifold, a flange fixed to the main body, and an outer periphery of the manifold. It has a ring part to fit,
The ring portion is fitted and attached to the manifold.

Alternatively, the supply pipe is formed integrally with the manifold, and is fitted in a through hole communicating the working fluid supply passage of the main body with the working fluid supply port of the manifold, and an outer periphery of the main body. A ring portion to be fitted, and the ring portion is fitted and attached to the main body.

Alternatively, the supply pipe may be a through hole communicating the working fluid supply passage of the main body with the working fluid supply port of the manifold, and a first fitting may be fitted to an outer periphery of the manifold.
A ring portion and a second ring portion fitted to the outer periphery of the main body, wherein the first ring portion is fitted to the manifold, and the second ring portion is fitted to and attached to the main body. is there.

According to another aspect of the present invention, there is provided a manifold which is attached to a cylinder head and stores a working fluid in a state of being pressurized to a predetermined pressure. The manifold is formed in a main body attached to the cylinder head and supplied with fuel from a common rail. A pressure chamber formed in the main body which is supplied from the manifold with the working fluid for driving the pressure boosting piston for boosting the fuel in the pressure boosting chamber; and a pressure chamber formed in the main body for driving the pressure boosting piston. In an electronically controlled hydraulically driven fuel injection device having a control valve for electronically controlling the supply to the pressure chamber and a needle valve for opening and closing a nozzle for injecting fuel from the pressure intensifying chamber, the fuel valve is connected to the pressure chamber. A working fluid supply port formed in the main body and a working fluid supply port of the manifold communicate with each other via a supply pipe, and the manifold and the cylinder head move relatively. A first engaging portion provided on the manifold is relatively movable to a second engaging portion provided on a support member fixed to the cylinder head in order to support the manifold on the cylinder head. The present invention relates to an electronically controlled hydraulically driven fuel injection device that is engaged.

[0029] The first engaging portion is constituted by engaging projections provided on both ends in the axial direction of the manifold, respectively.
The second engagement portion is configured by an engagement groove provided at an upper end of the support member that is slidably fitted to the engagement protrusion.

Further, the present invention provides a manifold which is attached to a cylinder head and stores a working fluid in a state where the working fluid is pressurized to a predetermined pressure. The manifold is formed in a main body attached to the cylinder head and supplied with fuel from a common rail. A pressure chamber formed in the main body which is supplied from the manifold with the working fluid for driving the pressure boosting piston for boosting the fuel in the pressure boosting chamber; and a pressure chamber formed in the main body for driving the pressure boosting piston. In an electronically controlled hydraulically driven fuel injection device having a control valve for electronically controlling the supply to the pressure chamber and a needle valve for opening and closing a nozzle for injecting fuel from the pressure intensifying chamber, the fuel valve is connected to the pressure chamber. A working fluid supply port formed in the main body and a working fluid supply port of the manifold communicate with each other via a supply pipe, and the manifold and the cylinder head move relatively. To allow a fuel injection system of electronic control hydraulically driven, characterized in that the elastically supported via a spring member with respect to said manifold said cylinder head.

In the above-mentioned electronically controlled hydraulically driven fuel injection device, the manifold and the cylinder head have two sets of opposing surfaces which are opposed to each other in the direction of relative movement and are arranged in series. The elastic member is provided between the facing surfaces. The manifold and the cylinder head are elastically supported at a neutral position by an elastic member disposed between the opposing surfaces of each pair. When the manifold and the cylinder head move relative to each other, the manifold and the cylinder head move between the opposing surfaces of each pair. The elastic member disposed on the base member is deformed to absorb the relative movement.

In the above electronically controlled hydraulically driven fuel injection device, the manifold has a flange formed with a bolt insertion hole, and a mounting bolt inserted through the bolt insertion hole is fixed to the cylinder head. The pair of opposing surfaces comprises the upper surface of the flange and the lower surface of the bolt head of the mounting bolt, and the other pair of the opposing surfaces comprises the upper surface of the cylinder head and the lower surface of the flange. Since the mounting bolt is used, the position of the manifold with respect to the cylinder head is regulated in accordance with a slight gap between the bolt insertion hole and the mounting bolt by inserting the mounting bolt into the bolt insertion hole formed in the flange. Can be used for one set of opposing surfaces for the elastic member.

In the electronically controlled hydraulically driven fuel injection device, the elastic member is formed as a coil spring, a plate spring, or a rubber body. When the elastic member is a coil spring, if the coil spring is arranged so that the mounting bolt penetrates through the coil hollow portion of the coil spring, the fixing of the mounting bolt and the assembly of the coil spring are performed at the same time. Preferred for assembly.

Further, in this electronically controlled hydraulically driven fuel injection device, the cylinder head for fixing the main body is made of an aluminum alloy, and the manifold is made of FC cast iron.

As described above, the electronically controlled hydraulically driven fuel injection device may be configured such that the working fluid supply passage formed in the main body communicating with the pressure chamber and the working fluid supply port of the manifold communicate with each other. Since the pipe is mounted so as to be relatively movable in the axial direction with respect to at least one of the manifold and the main body, when the cylinder head and the manifold thermally expand, a difference occurs in the amount of thermal expansion between the two. Also, a sliding movement that allows the difference in thermal expansion occurs at the connection between the supply pipe and the manifold or the main body,
The displacement between the working fluid supply passage formed in the main body and the working fluid supply port of the manifold is absorbed by the connection portion of the supply pipe, and the working fluid does not leak from the manifold to the working fluid supply passage of the main body. The fuel can be supplied, and good fuel injection can be ensured.

As described above, this electronically controlled hydraulically driven fuel injection device has a working fluid supply port formed in the manifold and a working fluid supply passage formed in the injector for supplying the working fluid from the manifold to the pressure chamber. The manifold is supported by the cylinder head by a support member having a second engaging portion that is movably engaged with a first engaging portion provided on the manifold. Even if the thermal expansion of the head and the manifold causes a difference in the amount of thermal expansion between the two, the difference in the thermal expansion is absorbed by the sliding movement between the support member and the manifold, and the displacement of the manifold is prevented to prevent the injector from being displaced. The displacement between the formed working fluid supply passage and the working fluid supply port of the manifold can be prevented, and the working fluid leaks from the manifold to the working fluid supply passage of the injector. Can be supplied without, it is possible to ensure excellent fuel injection.

As described above, the electronically controlled hydraulically driven fuel injection device has a working fluid supply port formed in the manifold and a working fluid supply passage formed in the injector for supplying the working fluid from the manifold to the pressure chamber. Are connected by a supply pipe, and the manifold is elastically supported via a spring member with respect to the cylinder head so that the manifold and the cylinder head can relatively move in a direction of coming and going from each other. Even if the head and the manifold thermally expand and a difference occurs in the amount of thermal expansion between the two, the difference in thermal expansion is absorbed by the flexure of the spring member, and the displacement of the manifold with respect to the injector body is prevented to form the injector. Position of the working fluid supply passage and the working fluid supply port of the manifold. Can be supplied without leaking the working fluid supply passage Kuta, it is possible to ensure good fuel injection.

Therefore, in this electronically controlled hydraulically driven fuel injection device, the cylinder head for fixing the main body can be made of an aluminum alloy, and the manifold can be made of FC cast iron.

[0039]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an electronically controlled hydraulically driven fuel injection device according to the present invention will be described below with reference to FIGS. FIG. 1 is a plan view showing one embodiment of a manifold and a supply pipe in an electronically controlled hydraulically driven fuel injection device according to the present invention, FIG. 2 is a side view of FIG. 1, FIG. 3 is a perspective view of FIG. FIG. 2 is an end view of FIG. 2 and FIG. 5 is a sectional view showing the electronically controlled hydraulically driven fuel injection device. 1 to 5
22 have almost the same configuration and the same function as those shown in FIGS. 22 and 23, except that the configurations of the working oil supply path and the fuel supply path are different. , The same components are denoted by the same reference numerals, and redundant description will be omitted.

This electronically controlled hydraulically driven fuel injection device is applied by being incorporated in a fuel supply system shown in FIG. 22. In this embodiment, referring to FIGS. 1 to 5 and FIG. The fuel injection device 1 will be described. The manifold 56 storing the working oil for increasing the pressure of the fuel in the fuel injection device 1 is arranged on the cylinder head in the lateral direction of the engine to supply the working oil to the fuel injection device 1 arranged in each cylinder of the engine. Has been established. The fuel injection device 1 is in a state in which the fuel supply port 11 and the fuel discharge port 12 are opened in the common rail 51 in the fuel supply system, and the fuel of the common rail 51 at a predetermined pressure is always supplied.

In the fuel injection device 1, the fuel supply includes a nozzle body 2 having a hollow hole, a hollow spacer body 21 having a hollow hole 29, a spacer body 81, and a pressure increasing chamber 7 for increasing the pressure of fuel. A main body (plunger barrel) 5, an injector main body 4 including a pressure chamber 8 to which high-pressure operating oil is supplied, and a solenoid main body including a drain groove 39 and a drain passage 38 serving as leak passages and in which a solenoid valve 16 slides. 3 is comprised. Further, a gap 40 between the top surface 65 of the outer peripheral portion of the large diameter portion 25 of the pressure increasing piston 9 and the wall surface 47 of the injector body 4 forming the pressure chamber 8.
Are formed. The top surface 65 at the center of the large-diameter portion 25 of the pressure-intensifying piston 9 corresponds to the spring chamber 30 around the small-diameter portion 24.
It is configured to abut against the wall surface 47 of the injector body 4 forming the pressure chamber 8 by the spring force of the return spring 17 disposed therein. The working fluid that drives the pressure-intensifying piston 9 supplied to the fuel injection device 1 is high-pressure working oil, as shown in FIG.

The cylinder head for fixing the fuel injection device 1 is made of an aluminum alloy, and the manifold 56 is made of FC.
Made of cast iron. The fuel injection device 1 is shown in FIGS.
As shown in FIG. 5, a manifold 56 for storing a working fluid oil pressurized to a predetermined pressure fixed to a cylinder head, and an injector body 4 attached to the manifold 56 and formed with fuel from the common rail 51 are provided. A pressure chamber 8 formed in a fuel supply main body 5, which is supplied with a working oil for driving a pressure-increasing chamber 7 to be supplied and a pressure-increasing piston 9 for increasing the fuel in the pressure-increasing chamber 7 from a manifold 56, a pressure-increasing piston 9 Solenoid valve 16 for electronically controlling the supply of working oil to the pressure chamber 8 for driving the valve, and a needle valve sliding in the nozzle body 2 for opening and closing the injection port 13 for injecting the fuel from the pressure increasing chamber 7 by the fuel pressure. 23.

In this electronically controlled hydraulically driven fuel injection device, in the above configuration, in particular, the oil supply path 31 formed in the injector body 4 communicating with the pressure chamber 8 and the oil supply port 88 of the manifold 56 are connected to the supply pipe. 15, the supply pipe 15 is connected to the manifold 56 and the injector body 4.
And are mounted so as to be relatively movable. The manifold 56 is fixed to the cylinder head via a flange 77 on the cylinder head. The supply pipe 15 has a flange portion 27 in which a through hole 89 is formed and a ring portion 92. A bolt hole 90 is formed in the flange portion 27 of the supply pipe 15.
The flange 27 of the supply pipe 15 is provided with a bolt (not shown) in the injector body 4 or a mounting portion (not shown) provided in the injector body 4 with a bolt hole 90.
Into the feed pipe 15
And the oil supply path 31 communicate with each other.

The ring portion 92 of the supply pipe 15 is fitted on the outer periphery of the manifold 56, and the through hole 89 of the supply pipe 15 and the oil supply port 88 of the manifold 56 communicate. The flange portion 27 of the supply pipe 15 is fixed to the injector body 4, but the ring portion 92 of the supply pipe 15 has a gasket 91 interposed in the manifold 56 so as to allow relative movement of the manifold 56 in the axial direction. It is fitted and attached. Therefore, even if the ring portion 92 of the supply pipe 15 is relatively moved in the axial direction of the manifold 56 due to thermal expansion with respect to the manifold 56, the through hole 89 of the supply pipe 15 is formed.
And the oil supply port 88 of the manifold 56 is slightly displaced, so that the working oil does not leak from the connection portion.

Next, another embodiment of the electronically controlled hydraulically driven fuel injection device according to the present invention will be described with reference to FIGS. 6 is a plan view showing another embodiment of a manifold and a supply pipe in an electronically controlled hydraulically driven fuel injection device according to the present invention, FIG. 7 is a side view of FIG. 6, and FIG. 8 is a perspective view of FIG. 9 is a sectional view taken along line AA of FIG. 7, and FIG. 10 is a sectional view showing another embodiment of the electronically controlled hydraulically driven fuel injection device according to the present invention. The fuel injection device shown in FIGS.
23 has almost the same configuration and the same function as those shown in FIG. 23 except that the configuration of the supply path of the working oil and the configuration of the supply path of the fuel are different. And duplicate description will be omitted.

This electronically controlled hydraulically driven fuel injection device is applied by being incorporated into a fuel supply system shown in FIG. 22. In this embodiment, FIGS.
The fuel injection device 1 will be described with reference to FIG. The fuel injection device 1 is disposed on the cylinder head in the lateral direction of the engine, similarly to the above-described embodiment. The structure of the pressure-intensifying piston 9 and the action of the high-pressure hydraulic oil on the pressure-increasing piston are the same as those in the above-described embodiment. is there. As in the above embodiment, the cylinder head for fixing the fuel injection device 1 itself is made of an aluminum alloy, and the manifold 56 is made of FC cast iron. Further, the fuel injection device 1 shown in FIG. 10 is the same as the embodiment shown in FIG.

In the electronically controlled hydraulically driven fuel injection device of this embodiment, the oil supply passage 31 formed in the injector body 4 communicating with the pressure chamber 8 and the oil supply port 88 of the manifold 56 communicate with the supply pipe 15. The supply pipe 15 is attached so that the manifold 56 and the injector main body 4 can relatively move. The manifold 56 is fixed to the cylinder head via a flange 77 on the cylinder head. The supply pipe 15 has a ring portion 92 in which a through hole 89 is formed and a ring portion 101. Ring part 10
1 is fitted on the outer periphery of the injector body 4, the through hole 89 communicates with the oil supply passage 31, and the ring portion 92 is fitted on the outer periphery of the manifold 56, and the through hole 89 and the manifold 56 are fitted.
The oil supply port 88 communicates with the oil supply port 88. The ring portions 101 and 92 of the supply pipe 15 are connected to the injector body 4 and the manifold 5.
The injector body 4 and the manifold 56 are fitted to each other via gaskets 91 so as to allow relative movement in the axial direction with respect to the injector 6.

Next, an embodiment of an electronically controlled hydraulically driven fuel injection device according to the present invention will be described with reference to FIG. 5 and FIGS. FIG. 11 is a schematic explanatory view showing an embodiment in which a manifold and an injector are mounted on a cylinder head in an electronically controlled hydraulically driven fuel injection device according to the present invention, and FIG. 12 is a schematic perspective view showing an example of a mounting state of an adjacent injector. 13 is a schematic end view of FIG. 11, FIG. 14 is a schematic side view of FIG. 11, FIG. 15 is a schematic plan view of FIG. 11, and FIG. 16 is a schematic diagram showing a mounting structure of the manifold of FIG. It is a perspective view. 5 and FIG. 11 to FIG.
2 and FIG. 23, except that the structure of mounting the manifold to the cylinder head is different, the components have almost the same configuration and the same function. The description of the operation will be omitted.

This electronically controlled hydraulically driven fuel injection device 1
Is applied by incorporating it into the fuel supply system shown in FIG. 22. In this embodiment, the fuel injection device 1 will be described with reference to FIGS. 11 to 16, FIGS. The fuel injection device 1 is in a state in which the fuel supply port 11 and the fuel discharge port 12 are opened in the common rail 51 in the fuel supply system, and the fuel of the common rail 51 at a predetermined pressure is always supplied. A gap 40 is formed between the top surface 65 of the outer peripheral portion of the large diameter portion 25 of the pressure increasing piston 9 and the wall surface 47 of the injector body 4 forming the pressure chamber 8. Top surface 65 at the central portion of large diameter portion 25 of pressure-intensifying piston 9
Is configured to abut against the wall surface 47 of the injector body 4 forming the pressure chamber 8 by the spring force of the return spring 17 disposed in the spring chamber 30 around the small diameter portion 24. The return spring 17 for urging the pressure-intensifying piston 9 toward the pressure chamber 8 is disposed in a spring chamber 30 formed by the hollow hole 26 of the injector body 4.

The manifold 56 storing the working oil for increasing the pressure of the fuel in the fuel injection device 1 supplies the working oil to the fuel injection device 1 arranged in each cylinder of the engine. 75. The fuel injection device 1 is inserted and disposed via a seal member in a hole 108 formed in the cylinder head 75 in a lateral direction of the engine corresponding to each cylinder. The fuel injection device 1 includes, for example, a support rod 104 fixed to a cylinder head 75 as shown in FIG.
Is pressed into the hole 108 of the cylinder head 75 by a pressing plate 105 attached to the upper end of the cylinder head 75. Alternatively, for example, the pressing plate 105
As shown in FIG. 12, the fitting notch portion 93 can be formed so that both ends thereof form the forked portion 110, and the adjacent fuel injection device 1 can be configured to be fixed. The adjacent fuel injection device 1 has its top protrusion 10
9 is fixed to the cylinder head 75 by being pressed by the forked portion 110 of the pressing plate 105 in a state of being fitted into the fitting notch 93 of the pressing plate 105.

The cylinder head 75 for fixing the fuel injection device 1 is made of an aluminum alloy, and the manifold 56 is made of FC cast iron. As shown in FIG. 11 to FIG. 16 and FIG. 5, the fuel injection device 1 supplies the manifold 56 that stores the oil of the working fluid in a state where the working fluid is pressurized to a predetermined pressure and attached to the cylinder head 75. The injector body 4 connected via the pipe 15, the pressure-intensifying chamber 7 formed in the injector body 4 and supplied with fuel from the common rail 51, and the pressure-intensifying piston 9 for increasing the fuel in the pressure-increasing chamber 7 are driven. A pressure chamber 8 formed in the fuel supply main body 5 to which the working oil is supplied from the manifold 56; a solenoid valve 16 for electronically controlling the supply of the working oil to the pressure chamber 8 for driving the pressure-increasing piston 9; A needle valve 23 that slides in the nozzle body 2 that opens and closes the injection port 13 for injecting the fuel from the nozzle 7 by the fuel pressure.

In the electronically controlled hydraulically driven fuel injection device, the oil supply passage 31 formed in the injector body 4 communicating with the pressure chamber 8 and the manifold 5
The oil supply port 6 is a supply pipe 15 having a through hole 89 formed therein.
It is communicated with. The manifold 56 is attached to and supported by the cylinder head 75 via a support member 103 such as a flange so as to be relatively movable. The supply pipe 15 is provided integrally with the manifold 56, extends from the manifold 56 toward the injector body 4, and has a flange 27 at an end thereof. A bolt hole 90 is formed in the flange part 27 of the supply pipe 15, and the flange part 27 of the supply pipe 15 is bolted (not shown) to the injector body 4 or a mounting part (not shown) provided on the injector body 4. ) Is fixed by inserting and screwing it into the bolt hole 90, and the through hole 89 of the supply pipe 15 and the oil supply passage 31 of the injector body 4 are in communication.

This electronically controlled hydraulically driven fuel injection device 1
In particular, the manifold 56 is supported on the cylinder head 75 by the support member 103. The engagement protrusions 11 of the first engagement portion are provided at both ends 95 in the axial direction of the manifold 56.
1 is provided. The support member 103 is fixed to the cylinder head 75, and an upper end 106 of the support member 103 is formed with an engagement groove 107 of a second engagement portion that movably engages with the engagement protrusion 111. That is, the engagement groove 107 formed in the upper end 106 of the support member 103 is provided with the manifold 56.
Engagement protrusions 111 are slidably fitted, whereby
The manifold 56 is supported so as to be relatively movable with respect to the support member 103 in a direction perpendicular to the axial direction of the manifold 56. In other words, the direction perpendicular to the axial direction of the manifold 56 corresponds to the engine lateral direction or the direction perpendicular to the crankshaft.

This electronically controlled hydraulically driven fuel injection device 1
Is constructed as described above, and the manifold 56 and the injector body 4 are fixed by the supply pipe 15, so that when the cylinder head 75 and the manifold 56 thermally expand during the operation of the engine, a difference in thermal expansion occurs between them. hand,
Even if the support member 103 fixed to the cylinder head 75 relatively moves with respect to the manifold 56 in the engine lateral direction as indicated by an arrow in FIGS. 15 and 16, that is, in a direction intersecting the axial direction of the manifold 56, Such relative displacement is absorbed by the sliding between the engagement groove 107 and the engagement protrusion 111. As a result, the manifold 56 is not displaced together with the cylinder head 75, a load due to a difference in thermal expansion does not act between the manifold 56 and the injector body 4 fixed by the supply pipe 15, and the supply pipe 15 and the injector body 4 No external force acts on the joint and the through hole 89 of the supply pipe 15
And the oil supply passage 31 of the injector body 4 does not shift, and the working oil does not leak from the connection portion.

Next, referring to FIG. 5 and FIGS. 17 to 20, another embodiment of the electronically controlled hydraulically driven fuel injection device according to the present invention will be described. FIG. 17 is a plan view showing still another embodiment showing the support of the manifold to the cylinder head in the electronically controlled hydraulically driven fuel injection device according to the present invention, FIG. 18 is a side view of FIG. 17, and FIG.
20 is a sectional view of FIG. The fuel injection device shown in FIGS. 5 and 17 to 20 has substantially the same configuration as that of the embodiment shown in FIGS. 1 to 5 except that the configuration for mounting the manifold to the cylinder head is different. Since they have the same functions, the same components are denoted by the same reference numerals, and redundant description will be omitted.

This electronically controlled hydraulically driven fuel injection device is applied by being incorporated into a fuel supply system shown in FIG. 22. In this embodiment, FIGS.
The fuel injection device 1 will be described with reference to FIGS. Similar to the embodiment shown in FIGS. 1 to 5, the fuel injection device 1 is disposed on the cylinder head 75 in the lateral direction of the engine, and has a structure of the pressure-increasing piston 9 and a pressure-increasing piston for high-pressure hydraulic oil. The same applies to the action on No. 9. Further, similarly to the above embodiment, the cylinder head 75 for fixing the fuel injection device 1 itself is made of an aluminum alloy, and the manifold 56 is made of FC cast iron.

In the electronically controlled hydraulically driven fuel injection device of this embodiment, as shown in FIGS. 17 to 20, the supply pipe 15 is attached so that the manifold 56 and the injector body 4 can move relative to each other. I have. That is, the supply pipe 15 communicates the oil supply path 31 formed in the injector body 4 communicating with the pressure chamber 8 with the oil supply port 88 of the manifold 56, but the supply pipe 15 is connected to the injector via the flange 27. It is fixed to the main body 4. On the other hand, the supply pipe 15 is fitted and attached to the manifold 56 via gaskets 91, 91 such that the ring portion 92 allows relative movement of the manifold 56 in the axial direction. The structure relating to the supply pipe 15 is the same as the structure in the embodiment shown in FIGS.

The manifold 56 is supported by the cylinder head 75 via the flange 120. A structure for supporting the manifold 56 to the cylinder head 75 will be described with reference to FIG. FIG. 20 shows the position of the supply pipe 15 and the flange 1 in FIG.
FIG. 3 is a cross-sectional view taken along the line 20 (line BB), and shows the injector and the cylinder head 75 at the same time. Flange 12 integrally formed with manifold 56
0, a bolt insertion hole 121 is formed in parallel with the direction in which the injector body 4 extends so as not to interfere with the pressure oil passage of the manifold 56.
1, a mounting bolt 124 for mounting the manifold 56 to the cylinder head 75 is inserted. The mounting bolt 124 is fixed to the cylinder head 75 by screwing a male screw portion 127 at the tip thereof into a female screw 128 provided in the cylinder head 75.

In order to elastically support the manifold 56 and the cylinder head 75, two sets of opposing surfaces are formed in series between the two, and an elastic member is provided between the opposing faces of each set. . The upper surface 122 of the flange 120 and the lower surface 126 of the head 125 of the mounting bolt 124 constitute one set of opposing surfaces, and the fixed surface 8 which is the upper surface of the cylinder head 75
2 and the lower surface 123 of the flange 120 constitute the other pair of opposing surfaces. A coil spring 130 as a spring member is provided between the opposing surfaces of one set, and a coil spring 131 is provided between the opposing surfaces of the other set.
Are arranged in a compressed state. Therefore, the manifold 56 is elastically supported by the cylinder head 75 via the coil springs 130 and 131. The mounting bolt 124 has a shaft portion inserted into a hollow portion of the coil of each of the coil springs 130 and 131 so that the coil spring is assembled.

The manifold 56 includes the coil spring 13
From the neutral position where the spring forces 0 and 131 are balanced, the mounting bolt 124 can be relatively displaced in the longitudinal direction.
That is, when a relative displacement occurs between the manifold 56 and the cylinder head 75, one of the coil springs is further compressed by an amount corresponding to the displacement from the case where the coil springs 130 and 131 are in the neutral state. The relative displacement is absorbed by the extension of the other coil spring.

In the above embodiment, a coil spring is described as an example of the spring member. However, instead of the coil spring, other means having elasticity such as a leaf spring such as a disc spring or a heat-resistant rubber body may be used. The good is clear. Regardless of the spring member, when a mounting bolt is used, it is preferable to arrange the spring member so as to surround the shaft portion of the mounting bolt in terms of assembling the device or balancing the elastic force of the elastic member. .

Therefore, the relative displacement between the manifold 56 and the cylinder head 75 due to the thermal expansion of the cylinder head 75 is absorbed by the bending of the elastic member. The cylinder head 75 thermally expands with the operation of the engine, or the cylinder head 75 and the manifold 5
When there is a difference in the amount of thermal expansion between the cylinder head 75 and the cylinder head 75, a relative displacement occurs between the cylinder head 75 and the manifold 56 fixed to the injector body 4 of the fuel injection device 1. In particular, displacement from the initial neutral position in the engine longitudinal direction orthogonal to the axial direction of the manifold 56, that is, displacement in a direction in which the manifold 56 approaches or separates from the cylinder head 75 in the longitudinal direction of the mounting bolt 124. Occurs. In this embodiment, since the displacement is absorbed by the bending of the coil springs 130 and 131, no excessive force acts on the injector body 4, the manifold 56 and the supply pipe 15. As a result, the working fluid can be accurately supplied from the manifold 56 to the pressure chamber 8 of the injector body 4 without leaking the working fluid at the connection portion of the supply system of the working fluid such as the working oil.

[0063]

As described above, the electronically controlled hydraulically driven fuel injection device according to the present invention stores the working fluid and the working fluid supply passage formed in the main body communicating with the pressure chamber to which the working fluid is supplied. The working fluid supply port of the manifold is communicated with a supply pipe, and in particular, the main body and the manifold are attached via a ring portion of the supply pipe so as to be relatively movable in at least one axial direction. Therefore, even if the amount of thermal expansion between the cylinder head made of an aluminum alloy and the manifold is different and a phase occurs in the axial direction, the ring portion of the supply pipe slides in the axial direction of the main body or the manifold. Moving to absorb the difference in thermal expansion, the supply system of the working fluid from the manifold to the main body does not shift, and the working fluid does not leak on the way. The working fluid can be reliably supplied to the pressure chamber in the main body, the booster piston can be driven by the working fluid, and the fuel in the booster chamber, which has been boosted by the booster piston, is accurately injected from the injection port. Can be done.

The electronically controlled hydraulically driven fuel injection device according to the present invention is mounted so that the manifold and the main body can be moved relative to each other via each ring of the supply pipe. Even if the mounting reference planes of the manifold and the main body with respect to the cylinder head made of an aluminum alloy are at different positions, and even if each of the mounting reference planes is displaced by the thermal expansion of the cylinder head, the difference in thermal expansion is It can be absorbed in the connection region of each ring portion of the supply pipe, the supply system of the working fluid from the manifold to the main body does not shift, the working fluid does not leak on the way, and the The working fluid can be reliably supplied to the pressure chamber in the main body, and the working fluid can drive the booster piston. The fuel in the intensifying chamber that is can be accurately sprayed from the injection port.

Further, the electronically controlled hydraulically driven fuel injection device according to the present invention can be used even if a relative displacement between the manifold and the cylinder head in the engine lateral direction due to thermal expansion occurs during engine operation. The second engagement portion of the support member fixed to the cylinder head with respect to the one engagement portion is absorbed by relative movement, and does not cause leakage of the working fluid in the supply system of the working fluid from the manifold to the injector. The working fluid can be accurately supplied to the pressure chamber of the injector. The working fluid from the manifold to the pressure chamber of the injector can be reliably supplied to the pressure chamber without leaking on the way, and the working fluid can drive the pressure-increasing piston, and the pressure is increased by the pressure-increasing piston. The fuel in the booster chamber can be accurately injected from the nozzle. Also, the thermal expansion difference does not affect between the supply pipe provided in the manifold and the injector,
Since the displacement of the support member does not act on the injector, the injector itself does not adversely affect the seal portion with respect to the cylinder head, and does not cause leakage of fuel or gas.

Further, the electronically controlled hydraulically driven fuel injection device according to the present invention is capable of moving the manifold to the cylinder even if a relative displacement occurs due to thermal expansion between the manifold and the cylinder head in the engine lateral direction during engine operation. Since the head is elastically supported via the spring member, a relative displacement caused by thermal expansion between the manifold and the cylinder head is absorbed by the spring member. Therefore, the conventional disadvantage of the cylinder head forcibly displacing the manifold and exerting an unreasonable force on the working fluid supply system between the manifold and the injector is avoided, and the operation from the manifold to the pressure chamber of the injector is prevented. In the fluid supply system, the working fluid can be reliably supplied without leaking on the way, the booster piston can be driven by the working fluid, and the fuel in the booster chamber that has been boosted by the booster piston is discharged from the injection port. It can be injected accurately. In addition, since the difference in thermal expansion does not affect the connection system between the supply pipe provided in the manifold and the injector, and the displacement of the support member does not act on the injector, the injector itself is provided in the seal with respect to the cylinder head. It has no adverse effects and does not cause fuel or gas leakage.

As described above, the relative positions of the connection system between the manifold, the support member, and the cylinder head, and the connection system between the injector body and the cylinder head, which were caused by the thermal expansion of the cylinder head and the manifold. Even if the displacement occurs, the relative displacement is allowed in the connection system because the displacement is absorbed in the connection system.Therefore, the cylinder head is made of an aluminum alloy. It can be made of high rigidity FC cast iron.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of a manifold and a supply pipe in an electronically controlled hydraulically driven fuel injection device according to the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a perspective view of FIG. 1;

FIG. 4 is an end view of FIG. 2;

FIG. 5 is a sectional view showing an embodiment of the electronically controlled hydraulically driven fuel injection device.

FIG. 6 is a plan view showing another embodiment of the manifold and the supply pipe in the electronically controlled hydraulically driven fuel injection device according to the present invention.

FIG. 7 is a side view of FIG. 6;

FIG. 8 is a perspective view of FIG. 6;

FIG. 9 is a sectional view taken along line AA in FIG. 7;

FIG. 10 is a sectional view showing another embodiment of an electronically controlled hydraulically driven fuel injection device according to the present invention.

FIG. 11 is a schematic explanatory view showing another embodiment in which a manifold and an injector are mounted on a cylinder head in an electronically controlled hydraulically driven fuel injection device according to the present invention.

FIG. 12 is a schematic perspective view showing an example of a state of attachment of adjacent injectors.

FIG. 13 is a schematic end view of FIG. 11;

FIG. 14 is a schematic side view of FIG. 11;

FIG. 15 is a schematic plan view of FIG.

FIG. 16 is a schematic perspective view showing a structure for mounting the manifold of FIG. 11 to a cylinder head.

FIG. 17 is a plan view showing still another embodiment of the manifold and the supply pipe in the electronically controlled hydraulically driven fuel injection device according to the present invention.

FIG. 18 is a side view of FIG.

FIG. 19 is a perspective view of FIG. 17;

20 is a cross-sectional view of the support structure of the manifold to the cylinder head in the electronically controlled hydraulically driven fuel injection device shown in FIG. 17, taken along line BB in FIG. 17, and showing the injector and the cylinder head together.

FIG. 21 is a sectional view showing an example of an electronically controlled hydraulically driven fuel injection device.

FIG. 22 is a schematic explanatory view showing a fuel supply system of a fuel injection device for an internal combustion engine.

FIG. 23 is a sectional view showing a conventional electronically controlled hydraulically driven fuel injection device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 fuel injection device 2 nozzle body 3 solenoid body 4 injector body 5 fuel supply body 6 case 7 booster chamber 8 pressure chamber 9 booster piston 15 supply pipe 16 solenoid valve 23 needle valve 27 flange portion 31 supply path 51 common rail 56 manifold 75 Cylinder head 77 Flange 88 Oil supply port 89 Through hole 92, 101 Ring part 95 Manifold end 103 Support member 106 Upper end of support member 107 Engagement groove 111 Engagement protrusion 120 Flange 121 Bolt insertion hole 122 Upper surface 123 Lower surface 124 Mounting bolt 125 Head 126 Lower surface 130,131 Coil spring

Claims (11)

[Claims] 1. A manifold attached to a cylinder head and storing a working fluid pressurized to a predetermined pressure, a pressure increasing chamber formed in a main body attached to the cylinder head and supplied with fuel from a common rail. A pressure chamber formed in the main body, from which the working fluid for driving the pressure boosting piston for boosting the fuel in the pressure boosting chamber is supplied from the manifold; and a pressure chamber for the working fluid for driving the pressure boosting piston. Control valve to electronically control the supply of
And an actuation of a working fluid supply passage formed in the main body communicating with the pressure chamber and the operation of the manifold in an electronically controlled hydraulically driven fuel injection device having a needle valve for opening and closing a nozzle for injecting fuel from the pressure boosting chamber. A fluid supply port is communicated with a supply pipe, and the supply pipe is attached to the manifold and the main body such that the manifold and the main body can move relative to at least one of the manifold and the main body in the axial direction. An electronically controlled hydraulically driven fuel injection device. 2. The supply pipe has a through hole communicating the working fluid supply passage of the main body with the working fluid supply port of the manifold, a flange fixed to the main body, and an outer periphery of the manifold. The electronically controlled hydraulically driven fuel injection device according to claim 1, further comprising a ring portion to be fitted, wherein the ring portion is fitted to and attached to the manifold. 3. The supply pipe is formed integrally with the manifold, and is fitted into a through hole that communicates the working fluid supply passage of the main body with the working fluid supply port of the manifold, and an outer periphery of the main body. The electronically controlled hydraulically driven fuel injection device according to claim 1, further comprising a ring portion that fits, wherein the ring portion is fitted and attached to the main body. 4. The supply pipe has a through-hole communicating the working fluid supply passage of the main body with the working fluid supply port of the manifold, a first ring portion fitted on an outer periphery of the manifold, and a main body of the main body. A second ring portion fitted to the outer periphery,
2. The electronically controlled hydraulically driven fuel injection device according to claim 1, wherein the first ring portion is fitted to the manifold, and the second ring portion is fitted to and attached to the main body. 5. A manifold attached to the cylinder head and storing a working fluid pressurized to a predetermined pressure, a pressure increasing chamber formed in a main body attached to the cylinder head and supplied with fuel from a common rail. A pressure chamber formed in the main body, from which the working fluid for driving the pressure boosting piston for boosting the fuel in the pressure boosting chamber is supplied from the manifold; and a pressure chamber for the working fluid for driving the pressure boosting piston. Control valve to electronically control the supply of
And an actuation of a working fluid supply port formed in the main body communicating with the pressure chamber and the operation of the manifold in an electronically controlled hydraulically driven fuel injection device having a needle valve for opening and closing a nozzle for injecting fuel from the pressure boosting chamber. A fluid supply port is communicated with a supply pipe, and a first engaging portion provided on the manifold is supported by the cylinder head so that the manifold and the cylinder head can move relative to each other. An electronically controlled hydraulically driven fuel injection device, which is relatively movably engaged with a second engagement portion provided on a support member fixed to the cylinder head. 6. The first engagement portion includes engagement protrusions provided at both ends in the axial direction of the manifold, and the second engagement portion is slidably fitted to the engagement protrusion. 6. The electronically controlled hydraulically driven fuel injection device according to claim 5, wherein the fuel injection device is constituted by an engagement groove provided at an upper end of the support member. 7. A manifold attached to a cylinder head and storing a working fluid pressurized to a predetermined pressure, a pressure increasing chamber formed in a main body attached to the cylinder head and supplied with fuel from a common rail. A pressure chamber formed in the main body, from which the working fluid for driving the pressure boosting piston for boosting the fuel in the pressure boosting chamber is supplied from the manifold; and a pressure chamber for the working fluid for driving the pressure boosting piston. Control valve to electronically control the supply of
And an actuation of a working fluid supply port formed in the main body communicating with the pressure chamber and the operation of the manifold in an electronically controlled hydraulically driven fuel injection device having a needle valve for opening and closing a nozzle for injecting fuel from the pressure boosting chamber. A fluid supply port is communicated with a supply pipe, and the manifold is elastically supported via a spring member with respect to the cylinder head so that the manifold and the cylinder head can move relative to each other. Electronically controlled hydraulically driven fuel injector. 8. The manifold and the cylinder head have two sets of facing surfaces facing each other in a relative movement direction and arranged in series, and the elastic member is provided between the facing faces of each set. 8. The electronically controlled hydraulically driven fuel injection device according to claim 7, wherein: 9. The manifold has a flange in which a bolt insertion hole is formed, and a mounting bolt inserted through the bolt insertion hole is fixed to the cylinder head. 9. The electronically controlled hydraulically driven fuel injection according to claim 8, comprising an upper surface and a lower surface of a bolt head of the mounting bolt, and the other set of opposed surfaces comprising an upper surface of the cylinder head and a lower surface of the flange. apparatus. 10. The elastic member includes a coil spring,
The electronically controlled hydraulically driven fuel injection device according to any one of claims 7 to 9, wherein the fuel injection device is a leaf spring or a rubber body. 11. The electronically controlled hydraulic system according to claim 1, wherein the cylinder head for fixing the main body is made of an aluminum alloy, and the manifold is made of FC cast iron. Driven fuel injector.