JP5146837B2 - Fuel injection device - Google Patents

Description

  The present invention relates to a hydraulically driven fuel injection device.

  Conventionally, a fuel supply system that supplies fuel from a high-pressure pump to an injector as a fuel injection device is known. An injector used in such a system includes a hydraulic drive type that lifts a valve member constituted by a needle valve or the like by fuel pressure. As this type of injector, for example, one in which a command piston and a needle valve constituting a valve member are integrally held is disclosed (for example, see Patent Document 1).

  By the way, in the injector disclosed by patent document 1, the motion of a valve member is controlled by the fuel pressure of the control chamber arrange | positioned on the opposite side to a nozzle hole. Specifically, the control valve is controlled by a control device such as an ECU. When the control valve is opened to allow the fuel to be discharged from the control chamber, the fuel pressure in the control chamber decreases. As a result, the valve member moves to the control chamber side, the injection hole is opened, and fuel is injected. On the other hand, when the control valve is closed so as to restrict the discharge of fuel from the control chamber, the fuel pressure in the control chamber increases. As a result, the valve member moves to the injection hole side, the injection hole is closed, and fuel injection is stopped.

JP-A-9-32681

  However, when the injection hole is blocked, it takes a certain amount of time for the fuel pressure in the control chamber to rise after the control valve is closed, so the time until the injection hole is closed becomes longer. There was a problem that. That is, it takes a long time for the valve member to move to a predetermined position after regulating fuel discharge from the control chamber.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a fuel injection capable of shortening the time until the valve member moves to a predetermined position after regulating fuel discharge from the control chamber. To provide an apparatus.

In the fuel injection device according to claim 1, which is made in order to solve the above-described object, the outer configuration portion forms a control chamber on the proximal end side of the valve member movable in the axial direction. The valve member moves in the axial direction by the fuel pressure in the control chamber. At this time, the valve member has a small-diameter small-diameter portion on the proximal end side and a large-diameter sliding portion on the distal end side, and the outer component portion slidably supports the sliding portion of the valve member. doing.
In addition, a plate portion is located on the base end side of the valve member, and when the valve member moves to the plate portion side due to a decrease in fuel pressure in the control chamber, the partition member of the partition means is moved to the end surface of the plate portion. Or it press-contacts to the end surface of a valve member, and a control chamber is divided into a 1st control chamber and a 2nd control chamber. For example, when the partition means is provided on the valve member side, the partition member of the partition means is in pressure contact with the end surface of the plate portion. Further, for example, when the partition means is provided on the plate portion side, the partition member of the partition means is in pressure contact with the end surface of the valve member.
Here, the partition member has a cylindrical shape, and the inner diameter is supported so as to be slidable with the outer diameter of the small-diameter portion of the valve member. A second control chamber is formed which is partitioned between the small diameter portion of the valve member and the outer structure portion.
Thus, the 1st flow path and the 2nd flow path are opening to the 1st control room and the 2nd control room which were divided by the division means, respectively. Both the first channel and the second channel are connected to the inlet side. Therefore, the fuel from the inlet side is guided to the first control chamber via the first flow path. Further, it is guided to the second control room via the second flow path. Further, the discharge channel is connected to the outlet side and opens to the control chamber.

  That is, in the state where the fuel pressure in the control chamber is relatively low, the control chamber is partitioned by the partitioning means, and the first control chamber and the second control chamber are formed. When the fuel discharge from the discharge flow path is restricted in this state, the fuel pressure in the first control chamber and the second control chamber is increased by the fuel from the inlet, but the pressure in the entire control chamber is increased. Compared to the above, for example, the fuel pressure of the smaller volume of the first control chamber and the second control chamber can be quickly increased. As a result, it is possible to shorten the time from when the fuel discharge from the control chamber is regulated until the valve member moves to a predetermined position.

  By the way, as shown in claim 2, the partition means is exemplified by a configuration having a biasing member and a partition member. At this time, when the partition member comes into contact with the end surface of the plate portion or the end surface of the valve member, the partition member is urged by the urging member so as to be pressed against the end surface.

For example, as shown in FIG. 4A, it is conceivable that the partition means is constituted by a spring 51 and a cylindrical member 52. As shown in FIG. 4B, the cylindrical member 52 is in pressure contact with the orifice plate 41 as the command piston 25 moves to the proximal end side, and forms a first control chamber 54 therein .

Furthermore, in the example shown in FIG. 4B, the space formed inside the cylindrical member 52 becomes the first control chamber 54, and the space formed outside the cylindrical member 52 becomes the second control chamber 55. At this time, the volume of the first control chamber 54 decreases as the command piston 25 moves to the proximal end side. In this sense, as shown in claim 4 , the volume of the first control chamber formed inside the partition member may be changed by the movement of the valve member.

In the configuration in which the partition means includes the biasing member, as shown in claim 3, the partition member is biased by the biasing member even when the partition member is separated from the end surface of the plate portion or the end surface of the valve member. It is good also as being done.

  For example, in FIG. 6, sliding of the cylindrical member 521 toward the proximal end side is restricted by a screw 71 that is screwed onto the proximal end portion of the command piston 25. Thereby, the spring 511 is always held in an elastically deformed state. Further, for example, in FIG. 7, a spring 72 is also disposed on the proximal end side of the cylindrical member 522, and due to the balance between the distal end side spring 512 and the proximal end side spring 72, Sliding is regulated. As a result, the spring 512 is held in an elastically deformed state at all times.

  By doing so, the partition member in the urged state contacts the end surface of the plate portion or the end surface of the valve member, so that the partition member can be sufficiently pressed. As a result, the liquid tightness of the first control chamber and the second control chamber can be improved, which contributes to an increase in the pressure of the control chamber after division.

  Hereinafter, embodiments of the present invention will be described. In particular, the difference between the first and fourth embodiments and the second and third embodiments is that the latter embodies claim 3.

It is a schematic structure figure showing a fuel injection system of an embodiment of the present invention. It is a schematic structure figure showing the fuel injection device of a 1st embodiment of the present invention. It is a partial expanded sectional view which shows the characteristic part of the injector of 1st Embodiment. It is explanatory drawing for demonstrating the characteristic part of the injector of 1st Embodiment. It is explanatory drawing which shows the time behavior of a fuel-injection apparatus. It is a partial expanded sectional view which shows the characteristic part of the injector of 2nd Embodiment. It is a partial expanded sectional view which shows the characteristic part of the injector of 3rd Embodiment. It is a schematic diagram which shows the characteristic part of the injector of 4th Embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The fuel injection system described here is a system for injecting fuel into each cylinder of an internal combustion engine, and is a DME injection system in which dimethyl ether (abbreviation: DME) is used as the fuel.

(First embodiment)
A fuel injection system 1 shown in FIG. 1 includes an injector 10 as a “fuel injection device”. In addition to the injector 10, a fuel tank 100, a feed pump 110 as a low pressure pump, a high pressure pump 120, and a high pressure common rail 130. And an electronic control unit (hereinafter referred to as “ECU”) 140 and the like.

  In the fuel tank 100, DME as fuel is stored in a liquid state. It is the feed pump 110 that pumps up this fuel. The feed pump 110 is connected to the high-pressure pump 120, and the fuel pumped up by the feed pump 110 is made high-pressure fuel by the high-pressure pump 120 and accumulated in the high-pressure common rail 130.

  The high-pressure common rail 130 has a supply port 131 and a plurality (six in this embodiment) of discharge ports 132 arranged in the longitudinal direction. A high-pressure pump 120 is connected to the supply port 131, and high-pressure fuel is supplied from the supply port 131 into the high-pressure common rail 130. On the other hand, the injector 10 is connected to each of the plurality of discharge ports 132. Each injector 10 is arranged in each cylinder. Therefore, as many discharge ports 132 as the number of cylinders of the internal combustion engine are provided. In FIG. 1, only one injector 10 is shown, and the rest are omitted.

  Further, the high-pressure common rail 130 has a common rail pressure sensor 133, and information regarding the fuel pressure of the high-pressure common rail 130 is input to the ECU 140. Furthermore, the high pressure common rail 130 has a pressure reducing valve 134. The pressure reducing valve 134 is controlled by the ECU 140 based on information from the common rail pressure sensor 133. In FIG. 1, a control line from the ECU 140 to the pressure reducing valve 134 is not shown in order to avoid complication. Here, when the pressure reducing valve 134 is opened by the ECU 140, a part of the accumulated fuel is returned to the fuel tank 100, and the fuel pressure inside the high pressure common rail 130 is reduced.

  The ECU 140 controls the pressure reducing valve 134 of the high-pressure common rail 130 as described above, and when the internal pressure of the high-pressure common rail 130 reaches a constant pressure, the ECU 140 energizes the injector 10 and starts fuel injection control by the injector 10.

  As described above, the injector 10 is mounted on each cylinder of the internal combustion engine, and is configured to inject fuel directly into each cylinder. The injector 10 has an inlet 11 and an outlet 12. A discharge port 132 of a high-pressure common rail 130 is connected to the inlet 11, and the outlet 12 is connected to the high-pressure common rail 130 via a back pressure control valve 151 that opens when the pressure exceeds a predetermined pressure (3 MPa in this embodiment). The fuel flow path to the fuel tank 100 is joined.

This embodiment is characterized by the structure of the injector 10. Next, the structure of the injector 10 will be described with reference to FIG.
The injector 10 includes a housing 13, a valve body 14, a tip packing 15 interposed between the housing 13 and the valve body 14, and a retaining nut 16 that fastens these members from the outside as members forming the outer shell. It has. The housing 13, the valve body 14, the tip packing 15, and the retaining nut 16 constitute an “outer structure part”.

  The inlet 11 and outlet 12 described above are formed in the housing 13. The fuel supplied from the inlet 11 passes through the passage 17 and then branches. One is guided to the valve body 14 via the passage 18 and is mainly used for injection. The other is used for hydraulic control, which will be described later, via the passage 19.

  A nozzle hole for injecting fuel is provided at the tip of the valve body 14 (not shown in FIG. 2). A passage 20 is formed inside the valve body 14, and a passage 21 is formed inside the tip packing 15. These passages are connected in order of the passage 18, the passage 21, and the passage 20 from the inlet side, whereby the fuel is guided to the tip of the valve body 14. Hereinafter, the side of the valve body 14 will be described as the “tip side” of the injector 10 as appropriate.

  Moreover, the injector 10 is provided with the valve member 22 accommodated in the inside over the longitudinal direction. The valve member 22 includes a needle 23, a coupling portion 24, and a command piston 25 from the distal end side. The needle 23 and the command piston 25 are integrally held by the coupling portion 24.

  Furthermore, the injector 10 includes an electromagnetic valve portion 30 on the side opposite to the distal end side (hereinafter referred to as “proximal end side” as appropriate). The electromagnetic valve part 30 is fastened to the housing 13 with a nut 31. The electromagnetic valve unit 30 includes a terminal 32, an armature 33, a body 34, a cup-type stopper 35, a coil 36, a control valve 37 having a T-shape in cross section, and the like.

  The terminal 32 is a terminal for energizing the coil 36. Therefore, a control valve drive current corresponding to the operating condition of the internal combustion engine is supplied to the coil 36 through the terminal 32 by the ECU 140 (see FIG. 1). Then, an excitation attractive force is generated in the coil 36 by supplying the control valve drive current.

  The armature 33 has a cylindrical cup-shaped stopper 35 at the center thereof. The cup-type stopper 35 has a shape that opens to the tip end side, and a spring 38 is disposed therein. The control valve 37 supported by the body 34 is urged by the spring 38. When an exciting suction force is generated in the coil 36 by supplying the control valve driving current, the control valve 37 moves to the proximal end side against the biasing force of the spring 38.

  The basic configuration has been described above. Next, a characteristic configuration will be described. A characteristic configuration of this embodiment is a hydraulic control configuration. The hydraulic control configuration is as shown in FIG. FIG. 3 is a partially enlarged cross-sectional view of a portion indicated by symbol A in FIG.

  An orifice plate 41 is provided between the control valve 37 and the command piston 25 described above. The orifice plate 41 is fixed in a state in which the rotation in the direction around the axis is restricted by the positioning pin 42. Although it has already been described that the control valve 37 is biased by the spring 38 (see FIG. 2), the control valve 37 comes into contact with the orifice plate 41 by the biasing force of the spring 38. Specifically, the control valve 37 has a valve 37a at the contact portion. The valve 37a is a part of a sphere configured in a planar shape. Here, the orifice plate 41 constitutes a “plate portion”.

The command piston 25 has a small diameter portion 25a having a small diameter on the base end side. Further, the command piston 25 has a large-diameter sliding portion 25 b that slides with respect to the housing 13 on the tip side. A step surface 25c is formed at the connecting portion between the small diameter portion 25a and the sliding portion 25b. Here, a spring 51 and a cylindrical member 52 are disposed in the small diameter portion 25a.

  The spring 51 is a coil spring and has one end locked to the step surface 25 c and the other end locked to the end of the cylindrical member 52. The cylindrical member 52 has a cylindrical shape having an inner diameter slightly larger than the outer diameter of the small diameter portion, and is supported by the small diameter portion 25a so as to be slidable.

  Around the small diameter portion 25a is a control chamber 53 filled with fuel. A passage opening to the control chamber 53 is formed in the orifice plate 41. A first in-orifice 61, a second in-orifice 62, and a discharge passage 63.

  The first in-orifice 61 and the second in-orifice 62 are connected to a supply passage 64 on the inlet 11 side (see FIG. 2). Thereby, the fuel from the inlet 11 is supplied to the control chamber 53 from the inlets 61 and 62 via the passages 17 and 19 formed in the housing 13 and the supply passage 64 formed in the orifice plate 41. Is done. The in-orifices 61 and 62 function as a throttle on the supply side.

  Further, the discharge passage 63 opens to the fuel chamber 57 formed inside the body 34 via the out orifice 65. Therefore, when the control valve 37 moves to the proximal end side by the excitation suction force of the coil 36, the discharge passage 63, the out orifice 65, the fuel chamber 57, the passage 58 connected to the fuel chamber 57, and the passage 59 connected to the passage 58. And finally leak from the outlet 12 (see FIG. 2). On the other hand, when the control valve 37 is in contact with the orifice plate 41 by the biasing force of the spring 38, the out orifice 65 is closed by the valve 37a, and the fuel is not discharged. The out orifice 65 functions as a throttle on the discharge side.

  Here, in particular, as shown in FIG. 4A, in the valve-closed state (the state where the command piston 25 has moved to the tip side) (the state where the command piston 25 is not lifted), the fuel from the in-orifices 61 and 62 both enters the control chamber 53. Supplied.

  On the other hand, as shown in FIG. 4B, when the command piston 25 is moved to the proximal end side (lifted state), the cylindrical member 52 is pressed against the end face of the orifice plate 41. Specifically, when the command piston 25 is lifted to a predetermined position, first, one end of the cylindrical member 52 comes into contact with the orifice plate 41, and when the command piston 25 is further lifted from this state, the spring 51 is elastically deformed and the elastic deformation thereof. Due to the reaction force, the cylindrical member 52 is urged toward the orifice plate 41 and presses against the orifice plate 41.

  At this time, the cylindrical member 52 partitions the control chamber 53 into a first control chamber 54 and a second control chamber 55. In this embodiment, the internal space of the cylindrical member 52 is the first control chamber 54, and the external space of the cylindrical member 52 is the second control chamber 55. As described above, the in-orifices 61 and 62 open to the control chamber 53. In the state shown in FIG. 4B, the first in-orifice 61 opens to the first control chamber 54 and the second in-orifice. 62 opens into the second control chamber 55. By the way, the flow area of the out orifice 65 is set larger than the flow area of the two in orifices 61 and 62 combined.

  In this embodiment, the spring 51 and the cylindrical member 52 constitute a “partitioning unit”, the spring 51 constitutes a “biasing member”, and the cylindrical member 52 constitutes a “partitioning member”. Further, the first in-orifice 61 constitutes a “first supply channel”, the second in-orifice 62 constitutes a “second supply channel”, and the discharge passage 63 and the out-orifice 65 constitute a “discharge channel”. Configure.

Next, the operation of the injector 10 will be described. Here, description will be made with reference to FIGS. 4 and 5. FIG. 5 is an explanatory diagram showing temporal behavior of each part.
First, when the coil 140 (see FIG. 2) is not energized by the ECU 140, the valve 37a of the control valve 37 is in contact with the orifice plate 41 and closes the out orifice 65.

  In this state, when the coil 140 is energized by the ECU 140 (time t1 in FIG. 5), the valve 37a of the control valve 37 is separated from the orifice plate 41 by the excitation suction force of the coil 36 (see “ (See “Valve Behavior”). Then, the out orifice 65 is opened, and the control chamber 53 communicates with the low pressure side fuel chamber 57 via the discharge passage 63 and the out orifice 65. Here, since the flow passage area of the out orifice 65 is set to be relatively large, the outflow fuel becomes larger than the inflow fuel, and the pressure in the control chamber 53 starts to decrease from the time t1 (“control” in FIG. 5). (See “Chamber Pressure Behavior”).

  And if the force which pushes up the valve member 22 (refer FIG. 2) becomes larger than the force which goes to the front end side (time t2 in FIG. 5), the valve member 22 will start the movement to a base end side. That is, the valve member 22 begins to lift (see “nozzle lift behavior” in FIG. 5).

  At time t3 in FIG. 5, the valve member 22 is completely opened, and at this time, the command piston 25 moves to the base end side as shown in FIG. 4B. Thereby, as described above, the control room 53 is partitioned into the first control room 54 and the second control room 55. At this time, since the flow of fuel from the second control chamber 55 to the first control chamber 54 is limited, a pressure difference is generated between the first control chamber 54 and the second control chamber 55. Specifically, the fuel pressure in the second control chamber 55 is larger than the fuel pressure in the conventional control chamber, and the fuel pressure in the first control chamber 54 is smaller than the fuel pressure in the conventional control chamber.

  Next, when the drive current supply from the ECU 140 to the coil 36 is completed at time t4 in FIG. 5, the valve 37a of the control valve 37 again comes into contact with the orifice plate 41 by the biasing force of the spring 38. Thereby, in the 1st control chamber 54, the fuel pressure rises because the out orifice 65 is obstruct | occluded. At this time, since the volume of the first control chamber 54 is minimized, the fuel pressure rises in a short time.

  At the time t5, the pressures in the first control chamber 54 and the second control chamber 55 become the same, but the fuel pressure in the second control chamber 55 partitioned by the cylindrical member 52 changes in a relatively high state. At this time t5, the pressures in the first and second control chambers 54 and 55 are higher than in the conventional case.

  In the conventional configuration, after the valve 37a of the control valve 37 again comes into contact with the orifice plate 41 by the biasing force of the spring 38 at time t4, the pressure in the control chamber does not increase rapidly. At time t7, the valve member 22 starts moving toward the tip side, and at time t9, the nozzle hole is closed. On the other hand, in the present embodiment, the fuel pressure at time t5 is larger than that in the conventional case, so that the valve member 22 starts moving toward the tip side from time t6 (time earlier than time t7), and time t8 ( The nozzle hole is closed at a time earlier than time t9). That is, conventionally, the time from the end time (time t4) of the supply of drive current to the coil 36 from the ECU 140 to the time t9 is the “valve closing time”, whereas in the present embodiment, the time from the time t4 to the time t8. The time until is the “valve closing time”.

  As described above in detail, in this embodiment, the control chamber 53 is divided into the first control chamber 54 and the second control chamber 55 by the cylindrical member 52 in accordance with the lift of the command piston 25. As a result, the flow of fuel from the second control chamber 55 to the first control chamber 54 is restricted, so that a pressure difference is generated between the first control chamber 54 and the second control chamber 55.

  Here, when the valve 37a of the control valve 37 again comes into contact with the orifice plate 41, the pressure in the first control chamber 54 and the second control chamber 55 becomes the same at time t5 (see FIG. 5). Since the fuel pressure of 55 changes in a relatively high state, the pressure in the first and second control chambers 54 and 55 becomes higher than the conventional pressure at this time t5. Therefore, it is possible to shorten the time from when the out orifice 65 is closed until the valve member moves to a predetermined position (valve closing position).

(Second Embodiment)
The hydraulic control configuration of this embodiment is as shown in FIG.

  As shown in FIG. 6, the base end portion of the command piston 251 is a small diameter portion 251a having a relatively small diameter. Here, in particular, a screw 71 is screwed onto the proximal end surface of the small diameter portion 251a. The screw 71 is a flat screw whose head 71a is cylindrical. The outer diameter of the head 71a is slightly larger than the outer diameter of the small diameter portion 251a.

  Moreover, the cylindrical member 521 is arrange | positioned at the small diameter part 251a. Here, the inner diameter of the cylindrical member 521 changes in the axial direction, and a stepped portion 521 a is formed on the inner wall of the cylindrical member 521. With this configuration, the head 71a of the screw 71 is engaged with the stepped portion 521a, so that sliding of the cylindrical member 521 toward the proximal end is restricted. In this embodiment, after the spring 511 and the cylindrical member 521 are disposed in the small diameter portion 251a, the cylindrical member 521 is assembled by the screw 71 being screwed and the spring 511 being elastically deformed.

  Also in this embodiment, the same effects as in the above embodiment can be obtained. Moreover, since the spring 511 is assembled in an elastically deformed state, the cylindrical member 521 is always urged, and sufficiently presses against the orifice plate 41 when the valve member 22 moves to the proximal end side. . As a result, it contributes to an increase in the pressure in the control chamber after the division.

  In this embodiment, the spring 511 and the cylindrical member 521 constitute a “partitioning unit”, the spring 511 constitutes a “biasing member”, and the cylindrical member 521 constitutes a “partitioning member”.

(Third embodiment)
The hydraulic control configuration of this embodiment is as shown in FIG.
In this embodiment, as shown in FIG. 7, a flange portion 522 a that protrudes radially outward is provided at the end of the cylindrical member 522. A spring 72 is disposed between the flange portion 522a and the orifice plate 41. Accordingly, the cylindrical member 522 is biased toward the proximal end side by the spring 512 and is biased toward the distal end side by the spring 72. In this embodiment, the cylindrical member 522 is assembled in a state where the spring 512 is elastically deformed by adjusting the urging force by the two springs 72 and 512.

  Also in this embodiment, the same effects as in the above embodiment can be obtained. Moreover, since the cylindrical member 522 is assembled while the spring 512 is elastically deformed, the cylindrical member 522 is always biased, and when the valve member 22 moves to the proximal end side, Weld enough. As a result, it contributes to an increase in the pressure in the control chamber after the division.

  In this embodiment, the springs 512 and 72 and the cylindrical member 522 constitute “partitioning means”, the springs 512 and 72 constitute “biasing member”, and the cylindrical member 522 constitutes “partitioning member”.

(Fourth embodiment)
The hydraulic control configuration of this embodiment is as shown in FIG. FIG. 8 is a schematic diagram schematically showing a hydraulic control configuration.
In this embodiment, as shown in FIG. 8, the cylindrical member 523 is disposed in the annular recess 411 a of the orifice plate 411. A spring 513 is disposed in the deep part of the annular recess 411a. When the spring 513 is elastically deformed, the cylindrical member 523 is urged toward the tip side. Therefore, when the valve member 22 moves to the proximal end side, the cylindrical member 523 comes into pressure contact with the proximal end portion of the small diameter portion 252a. As a result, the control room 53 is partitioned. As a result, also in this embodiment, the same effect as the above embodiment is produced.

  In this embodiment, the spring 513 and the cylindrical member 523 constitute a “partitioning unit”, the spring 513 constitutes a “biasing member”, and the cylindrical member 523 constitutes a “partitioning member”.

  As mentioned above, this invention is not limited to the said embodiment, In the range which does not deviate from the meaning of invention, it can implement with a various form.

DESCRIPTION OF SYMBOLS 1: Fuel injection system, 10: Injector (fuel injection apparatus), 11: Inlet, 12: Outlet, 13: Housing, 14: Valve body, 15: Tip packing, 16: Retaining nut, 17, 18, 19, 20 21: passage, 22: valve member, 23: needle, 24: coupling part, 25, 251: command piston, 25a, 251a, 252a: small diameter part, 25b: sliding part, 25c: step surface, 30: electromagnetic Valve part, 31: Nut, 32: Terminal, 33: Armature, 34: Body, 35: Cup type stopper, 36: Coil, 37: Control valve, 37a: Valve, 38: Spring, 41, 411: Orifice plate (plate Part), 411a: annular recess, 42: pin, 51, 511, 512, 513: spring (biasing member), 52, 21, 522, 523: cylindrical member (partition member), 521a: stepped portion, 522a: flange portion, 53: control chamber, 54: first control chamber, 55: second control chamber, 57: fuel chamber, 58, 59 : Passage, 61: in-orifice (first supply passage), 62: in-orifice (second supply passage), 63: discharge passage, 64: supply passage, 65: out-orifice, 71: screw, 71a: head, 72 : Spring (biasing member), 100: fuel tank, 110: feed pump, 120: high pressure pump, 130: high pressure common rail, 131: supply port, 132: discharge port, 133: common rail pressure sensor, 134: pressure reducing valve, 151 : Back pressure control valve

Claims (4)

A valve member that has a small-diameter small-diameter portion on the proximal end side and a large-diameter sliding portion on the distal-end side and is supported so as to be movable in the axial direction;
An outer configuration part that slidably supports the sliding part of the valve member and that forms a control chamber on the proximal side of the valve member that moves the valve member in the axial direction by an internal fuel pressure;
A plate portion located on the proximal end side of the valve member;
Has a partition member, when the valve member by the fuel pressure in the control chamber is reduced is moved to the plate portion, the partition member is pressed against the end face of the end face or the valve member of said plate portion, said control Partition means for partitioning the chamber into a first control chamber and a second control chamber;
A first supply flow path connected to the inlet side and opening into the first control chamber;
A second supply flow path connected to the inlet side and opening into the second control chamber;
A discharge channel connected to the outlet side and opening into the control chamber;
Equipped with a,
The partition member has a cylindrical shape, and an inner diameter thereof is slidably supported with an outer diameter of the small diameter portion of the valve member. The first control chamber is formed inside the partition member, and the outside is formed outside the first control chamber. The fuel injection device is characterized in that the second control chamber defined between the small-diameter portion of the valve member and the outer structure portion is formed . The fuel injection device according to claim 1,
It said partitioning means, when the partition member contacts the end face of the end face or the valve member of said plate portion, the fuel injection apparatus characterized by having a biasing member the partition member biases to press on the end face . The fuel injection device according to claim 2, wherein
The fuel injection device according to claim 1, wherein the partition member is biased by the biasing member even in a state of being separated from an end surface of the plate portion or an end surface of the valve member. In the fuel injection device according to any one of claims 1 to 3 ,
Wherein the first control chamber formed in the interior of the partition member, the fuel injection apparatus characterized by varying the volume by the movement of the valve member.

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