JP5672138B2 - Fuel injection device - Google Patents

Description

  The present invention relates to a fuel injection device used in a fuel injection system of an internal combustion engine (engine), and more particularly to a fuel injection device in which a fuel pressure sensor is mounted on an injector for a diesel engine.

[Conventional technology]
Conventionally, each cylinder of an internal combustion engine (engine) such as a diesel engine having a plurality of cylinders is mounted with a fuel injection valve (injector) that injects high-pressure fuel into a combustion chamber of each cylinder.
The injector accommodates a nozzle needle that opens and closes the nozzle hole, an actuator that drives the nozzle needle, and the like inside a housing (nozzle body, injector body) that forms a fuel passage for introducing high-pressure fuel from the outside into the nozzle hole. Configured.

  Here, as an actuator for an injector, a piezo actuator that drives a needle by using a displacement accompanying expansion and contraction of a piezo stack is known. This piezo actuator is installed inside the injector body at a location that is eccentric with respect to the center line in the longitudinal direction of the injector body, and two actuator lead wires that are insulated from the injector body by an insulating bush. Via an (injector drive line), it is electrically connected to an actuator connector terminal (injector drive line) for connection to the outside.

Here, a pressure sensor for detecting a fuel pressure fluctuation that varies with fuel injection for each cylinder is fixed to one end portion (upper end portion) of the injector body (injector body) in the axial direction by screw fastening. A terminal structure of such a pressure sensor has been proposed.
In such a pressure sensor terminal structure, a plurality of sensor terminal electrodes (sensor signal lines) whose rotational positions are not determined by screw fastening of the pressure sensor to the injector body and a plurality of sensors positioned with respect to the injector body For the purpose of preventing erroneous connection with a connector terminal (sensor signal line), a rotational alignment connector capable of performing alignment in the rotational direction is employed (see, for example, Patent Documents 1 to 3).

Here, the pressure of the high-pressure fuel in the fuel passage varies with the fuel injection from the injector nozzle hole. When the pressure sensor for detecting the pressure fluctuation is attached to the injector body, the time when the fuel pressure starts to decrease with the start of injection from the nozzle hole is detected in the pressure fluctuation waveform detected by the pressure sensor. This makes it possible to detect the actual injection start timing.
Further, it is possible to detect the actual injection end time by detecting the time when the fuel pressure starts to increase with the end of the injection.
In addition to these injection start timing and injection end timing, it is possible to detect the fuel injection amount by detecting the maximum value of the fuel pressure drop caused by the injection.

[Conventional technical problems]
However, in the injectors described in Patent Documents 1 to 3, a plurality of actuator connector terminals and a plurality of sensor connector terminals are accommodated in close proximity to an integrated connector integrally formed at the upper end of the injector body.
As described above, when the actuator connector and the sensor connector have an integrated connector structure, the actuator connector terminal and the plurality of sensor connector terminals are wired close to each other, so that the sensor connector terminal and sensor electrode that handle weak analog signals are connected. In addition, there is a possibility that an injector drive signal that flows through an actuator lead wire and an actuator connector terminal that handle high voltage rides (overlaps) as noise.

When the injector drive signal is superimposed on the analog signal as noise, there is a possibility that the digital signal or the fuel pressure is erroneously converted or miscalculated when the analog signal is converted into the digital signal or the fuel pressure by the ECU. That is, when the injector drive signal is superimposed on the analog signal as noise, the fuel pressure detection error becomes large, which causes a problem of reducing the measurement accuracy and reliability of the fuel pressure sensor.
In addition, in order to prevent erroneous assembly of the sensor terminal electrode whose position in the rotation direction is arbitrary and a plurality of sensor connector terminals positioned with respect to the injector body by screwing the pressure sensor to the injector body, Since an assembling process for assembling the rotational alignment connector having a complicated shape to the pressure sensor assembly is required, there is a problem that the manufacturing cost increases.

JP 2010-242577 A JP 2010-242578 A JP 2010-242579 A

  An object of the present invention is to provide a fuel injection device capable of realizing a separate connector structure having both noise resistance and a simple structure.

According to a first aspect of the present invention (fuel injection device), a needle that opens and closes an injection hole for injecting fuel, an actuator that drives a needle in a valve opening direction when receiving a drive signal from the outside, and a conductive connection to the actuator An injector having a first conductor group, a sensor circuit unit for outputting an analog signal corresponding to information to be measured to the outside, a sensor assembly having a second conductor group electrically connected to the sensor circuit unit, A fuel injection device comprising: a first connector assembly for connecting one conductor group to the outside; and a second connector assembly for connecting the second conductor group to the outside, wherein the sensor assembly is fixed to the injector by screw fastening. It is.
The first conductor group and the first connector assembly of the actuator are installed at positions separated by a predetermined distance from the second conductor group and the second connector assembly of the sensor assembly.
The first connector assembly includes a first terminal group that is conductively joined to the first conductor group, and a first molded body that holds these first terminal groups.
The first terminal group and the first molded body are formed by integral molding using an insulating first mold material.
The second connector assembly is disposed at the end of the injector on the side opposite to the injection hole, and the assembly position with respect to the injector is disposed at an arbitrary position in the rotational direction around the fastening shaft of the sensor assembly.
The sensor assembly and the second connector assembly are fixed (embedded and held) inside the first molded body by insert molding using the first molding material.

  According to the first aspect of the present invention, the first conductor group and the first connector assembly of the actuator and the second conductor group and the second connector assembly of the sensor assembly are installed at positions spaced apart from each other by a predetermined distance. ing. With this, the first connector assembly and the second connector assembly have an integrated connector structure (for example, a connector structure in which the connector terminals of the actuator and the sensor assembly are arranged adjacent to each other) and Compared to the distance between the first conductor group and the first connector assembly of the actuator and the second conductor group and the second connector assembly of the sensor assembly by a predetermined distance, the actuator drive signal is superimposed on the analog signal as noise. Therefore, the noise resistance of the second conductor group of the sensor assembly (sensor circuit unit) can be improved.

Here, the actuator and the first conductor group are installed at a fixed position with respect to the injector. As a result, the first connector assembly for connecting the first conductor group of the actuator to the outside is at a fixed position (for example, a fixed position on the side surface of the injector) at a predetermined distance from the second connector assembly. Installed.
In addition, the sensor assembly and the second connector assembly are fixed (embedded and held) inside the first molded body by insert molding using the first molding material. The second connector assembly is disposed at the end of the injector opposite to the injection hole.
On the other hand, the position of the sensor assembly (sensor circuit unit) and its second conductor group, which are screwed to the injector, in the rotational direction with respect to the injector is arbitrary for each product. As a result, the second connector assembly for connecting the second conductor group of the sensor assembly to the outside is screwed to the sensor assembly (the sensor circuit unit and the second conductor group) with respect to the injector at the assembly position with respect to the injector. At this time, the sensor assembly is installed at an arbitrary position in the rotation direction around the fastening axis of the sensor assembly.
Therefore, by eliminating the rotational alignment connector having a complicated shape, the connection structure between the second conductor group of the sensor assembly and the second connector assembly can be simplified, so that the manufacturing cost can be reduced.
As a result, a separate connector structure having both noise resistance and a simple structure can be realized.

According to the second aspect of the present invention, the fastening shaft of the sensor assembly is a rotation center shaft extending in a direction parallel to the major axis in the axial direction of the injector .
According to the invention described in 請 Motomeko 3, the first molded body, the from one side of the injector cylindrical projecting toward the outside of the widthwise direction perpendicular to the long axis direction of the center line of the injector 1 Has a case .

According to the invention described in 請 Motomeko 4, the second connector assembly includes a second terminal group that is conducting bonded to the second conductor group, and the second molded body that holds the second terminal group of these .
According to the invention described in claim 5 , the cylindrical second case projecting from the one end surface of the injector toward the outer side in the vertical direction parallel to the center line in the major axis direction of the injector. It has.
According to invention of Claim 6 , the 2nd terminal group and the 2nd molded object are comprised by integral molding by the 2nd molding material which has insulation.
Here, the first terminal group of the first connector assembly and the first conductor group of the actuator are separated by a predetermined distance from the second terminal group of the second connector assembly and the second conductor group of the sensor assembly. Installed.

According to the seventh aspect of the present invention, the injector is provided with the sensor support for fixing the sensor assembly by screw fastening.
Here, the second terminal group and the second molded body (second case) of the second connector assembly are rotated around the center line of the fastening axis of the sensor assembly with respect to the injector (sensor support body thereof). It is installed at any position in the direction (arbitrary rotational direction position).
According to the invention described in claim 8 , the sensor support body (inside) is provided with a flow path for supplying fuel from the outside to the nozzle hole.
The sensor assembly includes a bottomed cylindrical stem that is screwed to the sensor support.
According to the ninth aspect of the present invention, the sensor circuit section includes the sensor element and the circuit board.
The sensor element is mounted on the surface of the stem. This sensor element outputs a detection signal corresponding to information to be measured (externally, to the circuit board).
The circuit board converts the detection signal of the sensor element input from the sensor element into an analog signal and outputs the analog signal to the outside (such as an ECU).

According to the tenth aspect of the present invention, the stem is provided with a pressure introduction hole communicating with the flow path, and a diaphragm that is displaced when fuel pressure is introduced into the pressure introduction hole.
The sensor element includes a pressure measuring element (semiconductor element, piezoresistive element) that outputs a detection signal corresponding to the displacement of the diaphragm (externally, to the circuit board).
Here, the sensor assembly may be a semiconductor fuel pressure sensor assembly having a piezoresistive element that outputs a pressure detection signal (for example, a voltage signal) corresponding to the fuel pressure inside the injector to the outside (sensor circuit unit). good.
In addition, measurement elements (semiconductor elements, sensing elements) that output electrical signals corresponding to the physical information (light, magnetism, displacement, angle, speed, temperature, pressure, flow rate, sound, etc.) to be measured to the outside You may employ | adopt the physical information sensor which has.

1 is a cross-sectional view showing the main structure of an injector equipped with a fuel pressure sensor (Example 1). (Example 1) which is the fragmentary sectional view which showed the whole structure of the injector carrying a fuel pressure sensor. (Example 1) which is sectional drawing which showed the single-piece | unit structure of the fuel pressure sensor.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
The object of the present invention is to separate the first connector assembly and the second connector assembly by a predetermined distance and to have a complicated shape for the purpose of realizing a separate connector structure having both noise resistance and a simple structure. This was achieved by eliminating the rotational alignment connector. Further, the sensor assembly and the second connector assembly are fixed (embedded and held) in the first molded body by insert molding using the first molding material, and the second connector assembly is disposed at the end of the injector on the side opposite to the injection hole. Is arranged.

[Configuration of Example 1]
1 to 3 show a first embodiment of the present invention. FIG. 1 is a diagram showing a main structure of an injector equipped with a fuel pressure sensor. FIG. 2 is an overall structure of the injector equipped with a fuel pressure sensor. FIG. 3 is a diagram showing a single structure of the fuel pressure sensor.

The control device (engine control system) for the internal combustion engine of this embodiment includes a common rail fuel injection system (accumulation fuel injection device) known as a fuel injection system for an internal combustion engine (engine) such as a diesel engine.
The common rail fuel injection system includes a supply pump (high pressure fuel pump), a common rail, and a plurality of fuel injection devices (injectors). This common rail fuel injection system is configured to inject and supply high-pressure fuel accumulated in the common rail into the combustion chamber of each cylinder of the engine via each injector.

The supply pump has a built-in feed pump (low pressure fuel pump) having a known structure for pumping fuel from the fuel tank. This supply pump is a high-pressure fuel pump that pressurizes fuel that has been sucked into a pressurizing chamber from a feed pump through a solenoid valve to increase its pressure, and supplies this high-pressure fuel to a common rail.
A pressure accumulating chamber for accumulating high-pressure fuel corresponding to the injection pressure of the fuel to be injected and supplied into the combustion chamber for each cylinder of the engine is formed inside the common rail.
The supply pump or the common rail constitutes a high pressure generating unit that generates high pressure fuel.

The injectors mounted for each cylinder of the engine are direct injection type fuel injection valves that supply high-pressure fuel accumulated in the common rail in the form of a mist directly into the combustion chamber (automobile parts, engine parts) It is.
The injector has a nozzle hole for injecting fuel, a fuel flow path communicating with the nozzle hole, a nozzle body 1 containing a nozzle needle for opening and closing the nozzle hole, and an injection through the fuel flow path of the nozzle body 1. An injector body 2 having a fuel flow path communicating with the hole, and a retaining nut 3 for fixing the nozzle body 1 to the distal end portion (lower end portion in the drawing) of the injector body 2 by screw fastening are provided.

Inside the injector body 2, a piezoelectric actuator A that drives the nozzle needle in the valve opening direction when an injector (piezo) driving signal is received from the outside, and a back that is driven by the piezoelectric actuator A and controls the back pressure of the nozzle needle. And a pressure control mechanism.
A fuel sensor assembly (hereinafter referred to as a fuel pressure sensor S) for measuring (detecting) the pressure of fuel flowing through the fuel flow path of the injector body 2 is provided at the rear end portion (the upper end portion in the drawing) of the injector body 2 in the long axis direction. A first connector assembly (hereinafter referred to as a piezo connector B) that electrically connects the piezoelectric actuator A and an external circuit, and a second connector assembly (hereinafter referred to as a piezoelectric connector B) that electrically connects the fuel pressure sensor S and the external circuit. Sensor connector C).

The injector body 2 is wired with positive and negative piezo lead wires (first conductor group) 4 that are conductively joined to the piezo actuator A.
The fuel pressure sensor S is conductively bonded to a sensor chip 6 mounted on the stem 5, a mold IC 7 that processes a pressure detection signal output from the sensor chip 6 and outputs an analog signal, and a circuit board 8 of the mold IC 7. The first to fourth sensor leads (second conductor group) 9 are provided.

The piezo connector B includes a pair of positive electrode side, negative electrode side piezo terminals (first terminal group) 12 that are conductively joined to the conductive core wire (first conductor) 11 of the positive electrode side and negative electrode side piezo lead wire 4, and positive electrodes thereof. A resin molded body (first molded body) 13 that holds the side and negative electrode side piezo terminals 12 is provided. The piezo connector B is installed at a position separated from the sensor connector C by a predetermined distance.
Connector connecting terminals 14 and 15 are formed at both ends of the positive electrode side and the negative electrode side piezo terminal 12, respectively.
A piezo connector case (first case) 16, a terminal / lead wire wiring portion 17, and a sensor / connector holding portion 18 are integrally formed on the resin molded body 13 with a molded resin material.

The sensor connector C includes a plurality of first to fourth sensor terminals 22 that are conductively joined to the sensor electrodes 21 of the first to fourth sensor leads 9, and a resin molded body 23 that holds these sensor terminals 22. ing. The sensor connector C is installed at an arbitrary position (arbitrary rotational position) in the rotational direction around the center line of the fastening shaft of the fuel pressure sensor S with respect to the injector body 2.
Connector connecting terminals 24 and 25 are formed at both ends of the first to fourth sensor terminals 22, respectively.
A sensor connector case (second case) 26 and a terminal wiring portion 27 are integrally formed on the resin molded body 23 using a molded resin material.

Next, details of the piezo actuator A of the present embodiment will be briefly described with reference to FIGS.
The piezo actuator A is an external power source (external circuit) mounted on a vehicle such as an automobile via a piezo drive circuit (external circuit) electronically controlled by an engine control unit (electronic control unit: hereinafter referred to as ECU) that performs various engine controls. Battery). This piezo actuator A includes a laminate (piezo stack) formed by laminating a large number of piezo elements in the axial direction, a slit spring that applies a preload (preset load) in the compression direction (shrink direction) to the piezo stack, and a piezo stack. The rod is configured to include a rod that reciprocates in the axial direction in response to a displacement associated with the expansion and contraction, a plate that transmits a displacement associated with the expansion and contraction of the piezo stack to the pressure piston, and the like.
Instead of the piezo actuator A, an electromagnetic actuator composed of a stator and an armature may be employed.

The piezo stack, which is the main part of the piezo actuator A, is housed and held in the injector body 2 (actuator (piezo) housing hole 31).
The piezo actuator A transmits the displacement accompanying the expansion and contraction of the piezo stack to the pressurizing piston, and increases or decreases the fuel pressure in the pressure control chamber with the reciprocating displacement of the pressurizing piston, thereby opening and closing the nozzle needle (fuel injection). Used as a needle actuator to control.
Further, high pressure fuel is introduced into the fuel flow paths of the nozzle body 1 and the injector body 2 from the outside (common rail).
The positive side piezo lead wire 4 is conductively joined to the positive electrode of the piezo actuator A. Further, the negative side piezo lead wire 4 is conductively joined to the negative electrode of the piezo actuator A.
The piezo actuator A is electrically connected to the positive electrode side and negative electrode side piezo terminal 12 via the positive electrode side and negative electrode side piezo lead wires 4.
The details of the positive electrode side, negative electrode side piezoelectric lead wire 4 and the positive electrode side, negative electrode side piezoelectric terminal 12 will be described later.

Here, an actuator lead wire (piezo lead wire) accommodation hole 32 communicating with the piezo accommodation hole 31 is formed in the injector body 2 of the injector. A cylindrical insulating member 33 made of a synthetic resin mold resin material having an insulating property is inserted (press-fitted) into the piezoelectric lead wire receiving hole 32.
The injector body 2 has a cylindrical sensor support portion 34 at the end portion on the side opposite to the injection hole in the axial direction (the upper end side in the drawing).
A fuel pressure sensor S that outputs an analog pressure signal to the microcomputer of the ECU corresponding to the external circuit is assembled to the sensor support portion 34.
The sensor support 34 is formed with a fitting recess 35 that opens at the upper end surface (end surface on the side opposite to the injection hole) of the sensor support 34 and extends in the axial direction from the opening side to the back side. A female screw portion 36 is formed on the inner periphery of the fitting recess 35. In addition, an outlet (pressure introduction port) of a branch channel (fuel channel) 37 branched from the fuel channel of the injector body 2 is opened at the bottom surface of the fitting recess 35. The fitting recess 35 is assembled with a fuel pressure sensor S that detects fuel pressure fluctuations that vary with fuel injection for each cylinder.

Next, details of the fuel pressure sensor S of this embodiment will be briefly described with reference to FIGS.
The fuel pressure sensor S is a stem (straining body) 5 that is elastically deformed by the pressure of the high-pressure fuel in the branch flow path 37 of the injector body 2 and the magnitude of the distortion generated in the stem 5 as an electrical signal. A sensor chip 6 having a plurality of strain gauges (semiconductor piezoresistive elements) that convert and output as pressure detection values, and a mold IC (sensor circuit unit) 7 that processes detection signals output from the sensor chip 6 are provided. ing.
The fuel pressure sensor S is fixed (embedded and held) together with the sensor connector C by insert molding using a molded resin material inside the sensor / connector holding portion 18 of the resin molded body 13.

The stem 5 is formed of a bottomed cylindrical metal. The stem 5 is a fastening body that is screwed to the female screw portion 36 of the fitting recess 35 of the injector body 2.
The stem 5 has a diaphragm 41 which is a thin flat portion on one end side, and a pressure introducing hole 42 for guiding fuel pressure to the diaphragm 41 on the other end side.
A male screw portion 43 that is screwed into the female screw portion 36 of the fitting concave portion 35 of the injector body 2 is formed on the outer peripheral surface below the intermediate portion of the stem 5 in the drawing. The fuel pressure sensor S is attached to the sensor support portion 34 of the injector body 2 by screwing the male screw portion 43 of the stem 5 into the fitting recess 35 of the injector body 2.
A housing 44 is integrally formed on the outer periphery on the upper side (one end side) in the drawing with respect to the middle portion of the stem 5. A polygonal annular tool engaging portion 45 with which a tool such as a torque wrench can be engaged is formed on the outer peripheral portion of the housing 44. Further, a mold IC 7 is supported and fixed to the upper end surface of the housing 44 in the figure using a means such as adhesion.
Note that the stem 5 and the housing 44 may be configured separately, and the stem 5 and the housing 44 may be fixed using means such as welding.

A sensor chip 6 is bonded to the outer surface (surface, sensor mounting surface) of the diaphragm 41 of the stem 5 with low melting point glass. The sensor chip 6 functions as a strain gauge that detects strain generated when the diaphragm 41 is deformed by the fuel pressure introduced into the pressure introduction hole 42 of the stem 5.
The sensor chip 6 is formed by forming rectangular strain gauges that are four piezoresistive elements R1 to R4 on a square semiconductor substrate (single crystal silicon substrate).
The four piezoresistive elements R <b> 1 to R <b> 4 are the same circle centered on the center point of the diaphragm 41 that is located on the rotation center line of the fuel pressure sensor S when the fuel pressure sensor S is screwed to the injector body 2. It is arranged on the circumference.

  In the sensor chip 6, four piezoresistive elements R1 to R4 form a bridge circuit, and wiring, electrode pads, and a protective film for connection to an external circuit are formed. The sensor chip 6 is bonded to the surface of the diaphragm 41 of the stem 5 using low melting point glass. As a result, the sensor chip 6 receives an electric signal (displacement generated in the diaphragm 41) of the diaphragm 41 that is displaced (bends) by the action of the pressure of the high-pressure fuel that has flowed into the pressure introduction hole 42 of the stem 5. In the present embodiment, it can be converted into a potential difference of the bridge circuit accompanying the resistance change of the piezoresistive element. This electrical signal is processed by the processing circuit of the circuit board 8 of the mold IC 7 to detect the fuel pressure.

The mold IC 7 has a sensor chip 6 on which four piezoresistive elements R1 to R4 are formed, and is formed in an annular shape or a polygonal shape so as to surround the sensor chip 6. The mold IC 7 is fixed using an adhesive or the like in a state where the mold IC 7 is positioned with respect to the illustrated upper end surface (annular sensor circuit portion mounting surface) of the housing 44.
The mold IC 7 is formed by resin-sealing (molding) a circuit board 8 constituting a sensor signal processing circuit in the fuel pressure sensor S with a mold resin material 10 made of an insulating synthetic resin.
The mold resin material 10 is formed in a cylindrical shape extending annularly along the outer peripheral surface of the stem 5 of the housing 44.
The fuel pressure sensor S includes a stem 5, a sensor chip 6, and a mold IC 7. The first to fourth sensor leads 9 are conductively joined to the first to fourth electrode pads formed on the circuit board 8 of the mold IC 7.

The circuit board 8 is conductively bonded to the first to fourth electrode pads on the sensor chip 6 via bonding wires or the like. The bonding wire is conductively bonded (soldered) to the electronic component (conductor) on the circuit board 8 and the first to fourth electrode pads on the sensor chip 6 via a solder material.
The first to fourth electrode pads on the sensor chip 6 and the first to fourth electrode pads on the circuit board 8 are a platinum film, a polysilicon film, a single crystal silicon film, or the like formed by vacuum deposition or sputtering.
The electronic component includes an amplifier circuit that amplifies the pressure detection signal output from the sensor chip 6, a filtering circuit that removes noise superimposed on the detection signal, a voltage application circuit that applies a voltage to the strain gauge, and the like.
The amplifier circuit amplifies the pressure detection signal output from the sensor chip 6 (bridge circuit), converts the amplified pressure detection signal into an analog pressure signal, and outputs the analog pressure signal to the outside.
Note that, as described above, the strain gauge to which a voltage is applied from the voltage application circuit constitutes a bridge circuit (sensor circuit) in which the electrical resistance value changes in accordance with the magnitude of the strain generated in the diaphragm 41. . Thereby, the output voltage of the bridge circuit changes according to the distortion of the diaphragm 41, and the output voltage is output to the amplification circuit of the mold IC 7 as the pressure detection value of the high-pressure fuel.

A plate cover 46 made of synthetic resin (or metal) is fixed to the upper end surface of the mold resin material 10 of the mold IC 7 using an adhesive or the like.
The fitting provided on the lower end surface of the sensor connector case 26 on the center line of the fastening shaft (clamping shaft) of the fuel pressure sensor S on the upper end surface of the plate cover 46 (sensor connector mounting surface 47 of the mold IC 7). You may provide the fitting convex part (pin) or fitting recessed part (hole) which fits a recessed part (hole) or a fitting convex part (pin) so that sliding in a rotation direction is possible. In this case, the sensor connector C can be rotated on the fuel pressure sensor S around the center line of the fastening shaft (clamping shaft) of the fuel pressure sensor S. As a result, the position of the sensor connector C in the rotational direction can be easily matched to the position of the fuel pressure sensor S in the rotational direction, which facilitates connection work between the corresponding sensor electrode and the connector terminal.

In addition, a cylindrical shield case may be provided so as to cover the conductive junctions between the plurality of sensor electrodes and the plurality of connector terminals, the sensor chip 6, the circuit board 8, and the mold resin material 10. This shield case protects the sensor chip 6 and the mold IC 7 by blocking external (disturbance) noise.
Extending from the outer peripheral surface of the mold resin material 10 are first to fourth sensor leads 9 that are conductively bonded (soldered) to the first to fourth electrode pads on the circuit board 8 via a solder material. These sensor electrodes 21 are electrically connected to electronic components inside the mold IC 7. The circuit board 8 of the mold IC 7 is electrically connected to the first to fourth sensor terminals 22 via the first to fourth sensor leads 9.
The details of the first to fourth sensor leads 9 and the first to fourth sensor terminals 22 will be described later.

Next, details of the piezo connector (first connector assembly) B of the present embodiment will be briefly described with reference to FIGS.
The piezo connector B includes a positive side piezoelectric terminal 12 electrically connected to a positive side (Vcc side) electrode of a piezoelectric drive circuit or an external power source (battery) via a positive side electric wire (wire harness), a negative side electric wire (wire harness). ), And a negative electrode side piezoelectric terminal 12 electrically connected to the negative electrode side (ground side, GND side) electrode of the piezo drive circuit or the battery, and a resin molded body 13 holding these positive electrode side and negative electrode side piezoelectric terminal 12 It has. The resin molded body 13 is integrally provided with a rectangular tubular piezo connector case 16, a terminal / lead wire wiring portion 17, and a tubular sensor / connector holding portion 18.
The hood part of the piezo connector case 16 extends in the fitting direction with the mating connector (connection direction: left direction in the figure).
The terminal lead wire wiring portion 17 is a portion for resin-sealing the conductive joint between the positive electrode side, the negative electrode side piezoelectric lead wire 4 and the positive electrode side, the negative electrode side piezoelectric lead wire 4 and the positive electrode side, and the negative electrode side piezoelectric terminal 12. .
The sensor / connector holding portion 18 surrounds the periphery of the fuel pressure sensor S and the sensor connector case 26 in the circumferential direction, and a conductive joint between the first to fourth sensor leads 9 and the first to fourth sensor terminals 22 is made of resin. This is the part to be sealed.

The pair of positive electrode side and negative electrode side piezo terminals 12 are metal conductor plates (first terminal group, actuator external connection member) made of, for example, copper alloy or aluminum alloy.
These positive electrode side and negative electrode side piezo terminals 12 are manufactured by punching a metal thin plate having conductivity with a press molding machine.
Further, the positive electrode side and negative electrode side piezo terminal 12 are configured by integral molding with a mold resin material inside the terminal lead wire wiring portion 17 of the resin molded body 13. Specifically, one end portion of the positive electrode side and negative electrode side piezo terminal 12 (connector which is a conductive joint portion with the positive electrode side and negative electrode side piezo lead wire 4) is inserted into the molded resin material constituting the resin molded body 13 by insert molding. The connection terminal 14) is fixed (embedded and held).
On the other side of the positive electrode side and the negative electrode side piezo terminal 12, that is, on the side opposite to the conductive joint side with the positive electrode side and the negative electrode side piezo lead wire 4, are the piezo actuator A and ECU, a piezo drive circuit and a battery. Connector connection terminals 15 for electrical connection are integrally formed.
The connector connection terminal 15 has a terminal exposed portion that protrudes from the bottom surface of the piezo connector case 16 (the surface of the molded resin material) into the internal space (accommodating recess 19) of the piezo connector case 16 and is exposed.

Next, details of the sensor connector (second connector assembly) C of this embodiment will be briefly described with reference to FIGS.
The sensor connector C is electrically connected to an A / D conversion circuit, a power supply circuit, and the like of an ECU, which are external circuits, via a plurality of first to fourth electric wires (wire harnesses). , And a resin molded body 23 for holding the first to fourth sensor terminals 22.
A square cylindrical sensor connector case 26 and a terminal wiring portion 27 are integrally installed on the resin molded body 23.
The sensor connector case 26 has a hood portion extending in a fitting direction (connecting direction, upward direction in the drawing) with the mating connector.
The terminal wiring portion 27 is a portion that holds the first to fourth sensor terminals 22.
The sensor connector C (the first to fourth sensor terminals 22 and the terminal wiring portion 27 of the resin molded body 23) is inserted into the sensor / connector holding portion 18 of the resin molded body 13 together with the fuel pressure sensor S with a molded resin material. Fixed (buried) by molding.

The plurality of first to fourth sensor terminals 22 are metal conductor plates (second terminal group, sensor external connection member) such as a copper alloy or an aluminum alloy, for example.
These first to fourth sensor terminals 22 are manufactured by punching a metal thin plate having conductivity with a press molding machine and bending the same at the same time as this punching or after punching. .
Further, the first to fourth sensor terminals 22 are configured by integral molding with a molded resin material inside the terminal wiring portion 27 of the resin molded body 23. Specifically, an intermediate portion of the first to fourth sensor terminals 22 is fixed (embedded and held) by insert molding inside a molded resin material constituting the resin molded body 23.

Connector connection terminals 24 to which the first to fourth sensor leads 9 are conductively joined using means such as laser welding are integrally formed on one end side of the first to fourth sensor terminals 22. The connector connection terminal 24 has a terminal exposed portion that protrudes from the side surface (surface of the molded resin material) on the lower side of the sensor connector case 26 to the horizontal side (right direction in the drawing) and is exposed.
A bent portion that is bent at a right angle in a direction perpendicular to the forming direction of a terminal insert (embedded portion) inserted into the terminal wiring portion 27 of the resin molded body 23 at an intermediate portion of the first to fourth sensor terminals 22 The part 28 is integrally formed.
On the other end side of the first to fourth sensor terminals 22, that is, on the side opposite to the connector connection terminal 24 side, an electrical connection between the fuel pressure sensor S and the ECU A / D conversion circuit, power supply circuit, etc. The connector connection terminals 25 to be performed are integrally formed.
The connector connection terminal 25 has a terminal exposed portion that protrudes from the bottom surface of the sensor connector case 26 (the surface of the molded resin material) into the internal space (accommodating recess 29) of the sensor connector case 26 and is exposed.

Next, details of the pair of positive electrode side and negative electrode side piezo lead wires 4 of this embodiment will be briefly described with reference to FIGS. 1 and 2.
The positive electrode side and negative electrode side piezo lead wire 4 are conductive wires coated with an insulating film.
The positive side piezoelectric lead wire 4 is a conductor that electrically connects the positive electrode of the piezoelectric actuator A and the positive side piezoelectric terminal 12. The positive-side piezo lead wire 4 is a positive-side (plus-side) feed line (injector (piezo) drive line).
The negative electrode side piezo lead wire 4 is a conductor that electrically connects the negative electrode of the piezoelectric actuator A and the negative electrode side piezoelectric terminal 12. The negative electrode side piezo lead wire 4 is a negative electrode side (minus side) feed line (injector (piezo) drive line).

The positive electrode side and negative electrode side piezo lead wire 4 peels off one end portion of the insulating coating in the wiring direction to expose the conductive core wire, and the exposed conductive core wire is electrically connected to the positive electrode and the negative electrode of the piezoelectric actuator A. .
The positive electrode side and negative electrode side piezo lead wire 4 peels off the other end portion of the insulating coating in the wiring direction to expose the conductive core wire 11, and the exposed conductive core wire 11 is a connector of the positive electrode side and negative electrode side piezo terminal 12. Electrical connection is made to the connection terminal 14.
The positive side and negative side piezo lead wire 4 has a conductive joint (near the conductive core wire 11) with the connector connecting terminal 14 of the positive side and negative side piezo terminal 12 and is a molded resin material (terminal lead wire of the resin molded body 13). It is resin-sealed by the wiring part 17).
An intermediate portion between the positive electrode side and the negative electrode side piezo lead wire 4 passes through a cylindrical insulating member 33 inserted (press-fitted) into the piezo lead wire accommodation hole 32 of the injector body 2.

Next, details of the first to fourth sensor leads 9 of this embodiment will be briefly described with reference to FIGS.
The first to fourth sensor leads 9 are formed of a thin metal plate (lead frame) such as a copper alloy, for example.
The lead frame includes an inner lead in which a conductive junction with the first to fourth electrode pads on the circuit board 8 is resin-sealed by the mold resin material 10 of the mold IC 7. The lead frame includes outer leads that protrude from one side surface of the mold resin material 10 toward the outside (outside) and are exposed to the outside of the mold resin material 10.
In this embodiment, the outer leads of the lead frame are used as the first to fourth sensor leads 9. That is, the first to fourth sensor leads 9 are extended so as to protrude from one side surface of the mold resin material 10 to the outside (outside).

The first to fourth sensor leads 9 are perpendicular to the protruding direction (extension direction) of the outer lead and parallel to the center line of the fastening shaft of the fuel pressure sensor S (rejection of the injector). It is bent at right angles to the hole side and the connector connection terminal 24 side of the first to fourth sensor terminals 22.
The first to fourth sensor leads 9 are connected to the connector connection terminal 24 of the first to fourth sensor terminals 22 at the tip end closer to the connector connection terminal than the bent portion 28 bent at a right angle. It is used as That is, each sensor electrode 21 of the first to fourth sensor leads 9 is extended so as to protrude upward from the bent portion 28 in the figure.

One end of the first sensor lead 9 is soldered to a first electrode pad formed on the circuit board 8 (an electrode pad provided corresponding to the pressure signal output terminal Vout + of the bridge circuit formed on the sensor chip 6). Conductive bonding (soldering) is performed via The first sensor lead 9 is an output signal line for taking out an analog pressure signal (Vout +).
One end of the second sensor lead 9 is electrically connected to a second electrode pad (an electrode pad provided corresponding to the pressure signal output terminal Vout− of the bridge circuit) formed on the circuit board 8 via a solder material ( Soldered). The second sensor lead 9 is an output signal line for taking out an analog pressure signal (Vout−).

One end of the third sensor lead 9 has a solder material applied to a third electrode pad (electrode pad provided corresponding to the external power supply terminal Vdd of the bridge circuit formed on the sensor chip 6) formed on the circuit board 8. Conductive bonding (soldering) is performed. The third sensor lead 9 is a positive side (plus side) feeder.
One end of the fourth sensor lead 9 is electrically connected to a fourth electrode pad (an electrode pad provided corresponding to the ground (ground) terminal GND of the bridge circuit) formed on the circuit board 8 via a solder material ( Soldered). The fourth sensor lead 9 is a negative electrode side (minus side) power supply line.
The middle part of the first to fourth sensor leads 9 is a direction perpendicular to the protruding direction from one side surface of the mold resin material 10 of the mold IC 7 and a direction parallel to the center line of the fastening shaft of the fuel pressure sensor S Is bent at right angles to the one side (the anti-injection hole side of the injector, the upper side in the figure).
The other end side of the first to fourth sensor leads 9 is integrally formed with a conductive joint portion that is conductively joined to the connector connection terminal 24 of the first to fourth sensor terminals 22.
The first to fourth sensor leads 9 are provided at the end of the sensor connector side (the upper side in the drawing) of the conductive joint portion with the connector connection terminal 24 with respect to the bent portion 28 bent at a right angle.

The sensor electrode 21 of the first sensor lead 9 is conductively joined to the connector connection terminal 24 of the first sensor terminal 22 using means such as laser welding.
The sensor electrode 21 of the second sensor lead 9 is conductively joined to the connector connection terminal 24 of the second sensor terminal 22 using means such as laser welding.
The sensor electrode 21 of the third sensor lead 9 is conductively joined to the connector connection terminal 24 of the third sensor terminal 22 using means such as laser welding.
The sensor electrode 21 of the fourth sensor lead 9 is conductively joined to the connector connection terminal 24 of the fourth sensor terminal 22 using means such as laser welding.
In addition, the first to fourth sensor leads 9 have a conductive joint (periphery of the sensor electrode 21) with the connector connection terminal 24 of the first to fourth sensor terminals 22 as a molded resin material (a terminal of the resin molded body 13). The lead wire wiring part 17) is resin-sealed.

[Features of Example 1]
Next, a method for assembling the fuel pressure sensor S, the piezo connector B, and the sensor connector C to the injector body 2 of this embodiment will be briefly described with reference to FIGS.

First, the fuel pressure sensor S is assembled. The sensor chip 6 is bonded onto the surface of the diaphragm 41 of the stem 5 using low melting point glass.
Next, an annular mold IC 7 having the circuit board 8 is fixed on the circuit mounting surface of the housing 44 integrally formed on the outer periphery of the stem 5 by adhesion or the like.
Next, the first to fourth electrode pads on the sensor chip 6 and the first to fourth electrode pads on the circuit board 8 are conductively bonded via bonding wires or the like.
At this time, one end side (conducting junction) of the first to fourth sensor leads 9 is molded (inserted) inside the mold resin material 10 of the mold IC 7. Further, the other end side (conducting junction) of the first to fourth sensor leads 9 protrudes from one side surface of the mold resin material 10 to the outside (outside) and is exposed to the outside of the mold resin material 10.

Next, when a tool such as a torque wrench is engaged with the tool engaging portion 45 of the housing 44 and the housing 44 is rotated, the stem 5 rotates integrally, and the male screw portion 43 of the stem 5 is connected to the injector body 2 of the injector. The sensor support 34 is screwed into the fitting recess 35.
As a result, the fuel pressure sensor S with respect to the injector body 2 is centered on a fastening shaft that is a rotation center axis (rotation center axis of the fuel pressure sensor S) extending in a direction parallel to the major axis in the axial direction of the injector body 2. The screw is fastened.
At this time, the fuel pressure sensor S is arbitrarily attached to the injector body 2 in the rotational direction. That is, the first to fourth sensor leads 9 are arbitrarily assembled in the rotational direction with respect to the major axis in the axial direction of the injector body 2 by screwing the fuel pressure sensor S to the injector body 2.

Next, plate the sensor connector C so that the center portion of the sensor connector C in which the first to fourth sensor terminals 22 are insert-molded inside the resin molded body 23 is positioned on the center line of the fastening shaft of the fuel pressure sensor S. The cover 46 is disposed on the upper end surface of the cover 46 (the sensor connector mounting surface 47 of the mold IC 7).
Next, the sensor connector C is rotated around the center line of the fastening shaft of the fuel pressure sensor S, and the connector electrodes of the first to fourth sensor leads 9 and the connector terminals of the first to fourth sensor terminals 22 are rotated. 24 is electrically connected.
The electrical connection between the fuel pressure sensor S and the sensor connector C is established by laser welding or the like of each sensor electrode 21 of the first to fourth sensor leads 9 to the connector connection terminal 24.
As a result, the sensor connector C is assembled so that the assembly position in the rotation direction can be adjusted to the assembly position of the fuel pressure sensor S with respect to the injector body 2 by screw fastening.
At this time, the sensor connector C is set so that the assembly position with respect to the injector body 2 matches the assembly position of the fuel pressure sensor S at an arbitrary position in the rotation direction around the center line of the fastening shaft of the fuel pressure sensor S. Installed.

In addition, the sensor connector C, whose assembly position in the rotational direction with respect to the injector body 2 is determined in correspondence with the screw fastening direction of the fuel pressure sensor S, is located above the sensor support portion 34 of the injector body 2 (upper portion of the fuel pressure sensor S). ) Is formed (mounted). In other words, the rectangular cylindrical sensor connector case 26 provided on the resin molded body 23 of the sensor connector C is opened toward the fitting direction (connection direction, upward direction in the drawing) with the mating connector so that the injector body 2 is opened. Is formed (mounted) on the upper part of the sensor support part 34 (upper part of the fuel pressure sensor S).
On the other hand, the piezo stack and the like of the piezo actuator A are accommodated and held in the piezo accommodation hole 31 of the injector body 2. Further, the positive electrode side and negative electrode side piezoelectric lead wires 4 are inserted into the piezoelectric lead wire receiving holes 32 communicating with the piezoelectric receiving holes 31. Further, the other end side of the positive electrode side and the negative electrode side piezo lead wire 4 protrudes from the upper end surface of the insulating member 33 inserted into the piezoelectric housing hole 31 toward the outside of the injector body 2 and is outside the injector body 2. Exposed.
Then, after the screw fastening of the fuel pressure sensor S to the fitting recess 35 of the injector body 2 is finished, the other end side (conduction junction) of the positive electrode side and the negative electrode side piezo lead wire 4 is connected to the positive electrode side and the negative electrode side piezo terminal 12. The connector connection terminal 14 is electrically connected.

Next, the sensor support part 34 of the injector body 2 is used as a part of the resin mold, and the fuel pressure sensor S and the sensor connector C are used as cores, so that the upper part of the sensor support part 34 of the injector body 2 is used. The resin molded body 13 is formed by injection molding using a mold resin material.
As a result, the fuel pressure sensor S and the sensor connector C (the first to fourth sensor terminals 22 and the terminal wiring portion 27 of the resin molded body 23) are molded resin material inside the sensor / connector holding portion 18 of the resin molded body 13. It is fixed (buried) by insert molding.
Further, the connecting portion (conducting joint portion) between the positive electrode side, negative electrode side piezo lead wire 4 and the positive electrode side, negative electrode side piezo terminal 12 is made of resin by a molding resin material (terminal / lead wire wiring portion 17 of the resin molded body 13). Sealed.
Further, the connecting portion (conducting joint portion) between the first to fourth sensor terminals 22 and the first to fourth sensor leads 9 is sealed with a molding resin material (terminal / lead wire wiring portion 17 of the resin molded body 13). It has been stopped.

Accordingly, the piezo connector B is formed by integral molding with the mold resin material on the side surface portion of the injector. That is, the rectangular piezo connector case 16 provided on the resin molded body 13 of the piezo connector B opens toward the fitting direction (connection direction, left direction in the drawing) with the mating connector so that the injector body 2 is opened. Is formed (mounted) on the side surface portion (side portion of the fuel pressure sensor S).
Note that the assembly (attachment) position of the piezo connector B with respect to the injector is uniquely determined with respect to the sensor support portion 34 of the injector body 2.
Thus, the attachment of the fuel pressure sensor S, the piezo connector B, and the sensor connector C, the internal electrical wiring, and the connection to the injector body 2 are completed.

[Effect of Example 1]
As described above, in the injector in which the fuel pressure sensor S is screwed to the fitting recess 35 of the injector body 2, the positive side of the piezoelectric actuator A, the negative side piezoelectric lead wire 4 and the positive side of the piezoelectric connector B, and the negative side piezoelectric. The terminal 12, the first to fourth sensor leads 9 of the fuel pressure sensor S and the first to fourth sensor terminals 22 of the sensor connector C are installed at positions separated from each other by a predetermined distance.

As a result, the piezoelectric connector B and the sensor connector C are compared with the conventional technology in which the connector connector is configured as an integral connector structure (for example, a connector structure in which the connector connection terminals of the actuator and the sensor assembly are arranged close to each other). Thus, the positive electrode side, the negative electrode side piezoelectric terminal 12 and the positive electrode side, the negative electrode side piezoelectric lead wire 4 and the sensor connector C held by the terminal / lead wire wiring portion 17 of the resin molded body 13 of the piezoelectric connector B for a predetermined distance. The first to fourth sensor terminals 22 and the first to fourth sensor leads 9 held by the terminal wiring portion 27 of the resin molded body 23 are separated by a predetermined distance.
This makes it difficult for the drive signal of the piezoelectric actuator A to be superimposed on the analog pressure signal as noise, so the first to fourth sensor leads of the first to fourth sensor terminals 22 of the sensor connector C and the mold IC 7 of the fuel pressure sensor S. 9 can improve the noise resistance.

Here, the piezo actuator A and its positive and negative piezo lead wires 4 are uniquely installed at a fixed position (a fixed position on the side of the injector body 2) with respect to the injector. Accordingly, the positive electrode side of the piezoelectric actuator A, the negative electrode side piezoelectric lead wire 4 and the positive electrode side of the piezoelectric connector B, and the negative electrode side piezoelectric terminal 12 are connected to the first to fourth sensor leads 9 of the fuel pressure sensor S and the sensor connector C. It is installed at a fixed position (for example, a fixed position of the side surface portion of the injector body 2) spaced a predetermined distance from the first to fourth sensor terminals 22.
On the other hand, the mold IC 7 of the fuel pressure sensor S and the first to fourth sensor leads 9 screwed to the sensor support part 34 of the injector body 2 are rotated in the rotational direction with respect to the sensor support part 34 of the injector body 2. The position is arbitrary for each product. As a result, the sensor connector C for connecting the first to fourth sensor leads 9 of the fuel pressure sensor S to the outside has an assembly position with respect to the sensor support portion 34 of the injector body 2, and the sensor support portion 34 of the injector body 2. The fuel pressure sensor S is installed at an arbitrary position in the rotational direction around the central axis of the fastening shaft of the fuel pressure sensor S when the fuel pressure sensor S is screw-fastened.

Therefore, since the rotational alignment connector having the connector terminal having a complicated shape as in the prior art can be eliminated, the first to fourth sensor leads 9 of the fuel pressure sensor S and the first to first sensors of the sensor connector C can be eliminated. Since the electrical connection structure with the fourth sensor terminal 22 can be simplified (simplified), the manufacturing cost of the injector equipped with the fuel pressure sensor S can be reduced.
As a result, a separate connector structure having both noise resistance and a simple structure can be realized.

[Modification]
In this embodiment, the fuel pressure sensor S capable of measuring the fuel pressure inside the injector mounted on the fuel injection device of the present invention corresponding to each cylinder of the internal combustion engine (engine) is screwed to the injector body 2. Although applied to a fuel pressure measuring device, the fuel injection device of the present invention is provided with a pressure sensor capable of measuring the fuel pressure inside another fuel supply device (fuel injection device) such as a supply pump, a common rail, etc. The present invention may be applied to a fuel pressure measuring device that is screwed to the body.

In this embodiment, the actuator that opens and closes the needle that opens and closes the nozzle hole for injecting fuel in the axial direction is constituted by the piezo actuator A, but the actuator that opens and closes the needle in the axial direction includes a motor, You may comprise by the electric actuator provided with the deceleration mechanism and the conversion mechanism. Moreover, you may comprise by the negative-pressure actuated actuator provided with the electromagnetic or electric negative pressure control valve.
Further, as an engine, not only a diesel engine but also a gasoline engine may be used. Further, as the engine, not only a multi-cylinder engine but also a single-cylinder engine may be used.

In this embodiment, a piezoresistive element (semiconductor element, pressure measuring element) that outputs a signal corresponding to the displacement of the diaphragm 41 of the stem 5 to the outside is formed (mounted) on the sensor chip 6. A pressure measuring element that outputs a signal corresponding to the displacement of the diaphragm 41 to the outside may be directly formed (mounted) on the surface (sensor mounting surface) of the diaphragm 41. Further, the plate cover 46 may not be provided.
In addition, the number of sensor electrodes may be 2, 3, or 5 or more depending on the number of lead terminals of the measuring element (sensor element, sensing element) and the number of electrodes of the sensor circuit (signal processing circuit, signal amplification circuit, etc.). .

  In this embodiment, as a measurement element (sensing element) that outputs a signal corresponding to information to be measured to the outside, a pressure detection signal (for example, a voltage signal) corresponding to the fuel pressure inside the injector is supplied to an external circuit (ECU or the like). The semiconductor fuel pressure sensor S having a piezoresistive element that outputs to the physical information (light, magnetism, displacement, angle, speed, temperature, pressure, flow rate, sound, etc.) You may employ | adopt the physical information sensor which has a measurement element (semiconductor element, sensing element) which outputs the corresponding electrical signal with respect to the exterior.

Further, the fastening shaft of the sensor assembly S may be inclined by a predetermined angle with respect to the long axis in the axial direction of the injector.
Further, when the fitting direction of the piezo connector case (first case) 16 with respect to the mating connector is one side (the upper side in the drawing) parallel to the major axis in the axial direction of the injector, The fitting direction of the sensor connector case (second case) 26 may be one side (the left side in the drawing or the right side in the drawing) in the radial direction with respect to the long axis in the axial direction of the injector.

A Piezo actuator B Piezo connector (first connector assembly)
C Sensor connector (second connector assembly)
S Fuel pressure sensor (sensor assembly)
1 Nozzle body 2 Injector body (sensor support)
4 Positive and negative side piezo lead wires (first conductor group)
5 Stem 6 Sensor chip having sensor element (pressure measuring element) 7 Mold IC (sensor circuit part)
8 Circuit board of molded IC 9 First to fourth sensor leads (second conductor group)
12 Positive and negative piezo terminals (first terminal group)
13 Resin molded body (first molded body)
14 Positive connector side and negative electrode side piezo terminal connector connection terminals 15 Positive electrode side and negative electrode side piezo terminal connector connection terminals 16 Resin molded body piezo connector case (first case)
17 Terminal / Lead Wire Wiring Portion of Resin Molded Body 18 Sensor / Connector Holding Portion of Resin Molded Body 21 Each Sensor Electrode of First to Fourth Sensor Leads 22 First to Fourth Sensor Terminals (Second Terminal Group)
23 Resin molded body (second molded body)
24 Each connector connecting terminal of the first to fourth sensor terminals 25 Each connector connecting terminal of the first to fourth sensor terminals 26 Sensor connector case (second case) of the resin molded body
27 Terminal Wiring Portion of Resin Molded Body 41 Stem Diaphragm 42 Stem Pressure Introducing Hole

Claims (10)

Needle for opening and closing a nozzle hole for injecting fuel, an actuator for driving the needle and receiving the drive signal from the outside to the opening direction (A), and a first conductor group which is conducting joined to the actuator (A) (4) An injector having
A sensor circuit unit (7, 8) that outputs an analog signal corresponding to information to be measured to the outside, and a second conductor group (9) that is conductively joined to the sensor circuit unit (7, 8) Assy (S),
A first connector assembly (B) for connecting the first conductor group (4) to the outside;
A second connector assembly (C) for connecting the second conductor group (9) and the outside;
In the fuel injection device in which the sensor assembly (S) is fixed to the injector by screw fastening,
The first conductor group (4) and the first connector assembly (B) are installed at positions separated by a predetermined distance from the second conductor group (9) and the second connector assembly (C). ,
The first connector assembly (B) includes a first terminal group (12) that is conductively joined to the first conductor group (4), and a first molded body (13) that holds the first terminal group (12). And the first terminal group (12) and the first molded body (13) are formed by integral molding with a first molding material having an insulating property,
The second connector assembly (C) is disposed at the end of the injector on the side opposite to the injection hole, and the assembly position with respect to the injector is arbitrary in the rotational direction around the fastening shaft of the sensor assembly (S). Installed in position ,
The fuel injection device, wherein the sensor assembly (S) and the second connector assembly (C) are fixed inside the first molded body (13) by insert molding using the first molding material . The fuel injection device according to claim 1,
The fuel injection device according to claim 1, wherein the fastening shaft of the sensor assembly (S) is a rotation center shaft extending in a direction parallel to a major axis in the axial direction of the injector. The fuel injection device according to claim 1 ,
Before Symbol first molded body (13), a cylindrical first case projecting toward the outside of the vertical lateral from one side to the long axis direction of the center line of the injector of the injector (16) A fuel injection device comprising: The fuel injection device according to any one of claims 1 to 3 ,
The second connector assembly (C) includes a second terminal group (22) that is conductively joined to the second conductor group (9), and a second molded body (23) that holds the second terminal group (22). ) fuel injection apparatus characterized in that it has a. The fuel injection device according to claim 4, wherein
The second molded body (23) has a cylindrical second case (26) protruding from one end surface of the injector toward the outside in the vertical direction parallel to the center line in the major axis direction of the injector. A fuel injection device characterized by that . The fuel injection device according to claim 4 or 5,
The fuel injection device, wherein the second terminal group (22) and the second molded body (23) are formed by integral molding with an insulating second mold material . The fuel injection device according to any one of claims 1 to 6,
The fuel injector according to claim 1, wherein the injector has a sensor support (2) for fixing the sensor assembly (S) by screw fastening . The fuel injection device according to claim 7, wherein
The sensor support (2) has a flow path for supplying fuel from the outside to the nozzle hole,
The fuel injection device according to claim 1, wherein the sensor assembly (S) has a bottomed cylindrical stem (5) screwed to the sensor support (2) . The fuel injection device according to claim 8, wherein
The sensor circuit unit (7) is mounted on the surface of the stem (5) and outputs a detection signal corresponding to information to be measured, and a detection signal of the sensor element (6) A fuel injection device comprising a circuit board (8) for converting the signal into an analog signal and outputting the analog signal . The fuel injection device according to claim 9, wherein
The stem (5) has a pressure introduction hole (42) communicating with the flow path, and a diaphragm (41) that is displaced when fuel pressure is introduced into the pressure introduction hole (42),
The fuel injection device according to claim 1, wherein the sensor element includes a pressure measuring element (6) that outputs a detection signal corresponding to the displacement of the diaphragm (41) .

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