JP4506709B2 - Injector - Google Patents

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JP4506709B2
JP4506709B2 JP2006103910A JP2006103910A JP4506709B2 JP 4506709 B2 JP4506709 B2 JP 4506709B2 JP 2006103910 A JP2006103910 A JP 2006103910A JP 2006103910 A JP2006103910 A JP 2006103910A JP 4506709 B2 JP4506709 B2 JP 4506709B2
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lead wire
injector
hole
holding
guide
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JP2007278139A (en
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透 田口
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株式会社デンソー
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00Fuel-injection apparatus characterised by being operated electrically
    • F02M51/005Arrangement of electrical wires and connections, e.g. wire harness, sockets, plugs; Arrangement of electronic control circuits in or on fuel injection apparatus
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M47/00Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • F02M47/027Electrically actuated valves draining the chamber to release the closing pressure
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012Valves
    • F02M63/0014Valves characterised by the valve actuating means
    • F02M63/0015Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • F02M63/0026Valves characterised by the valve actuating means electrical, e.g. using solenoid using piezoelectric or magnetostrictive actuators

Description

  The present invention relates to an injector that controls opening / closing operation of a nozzle by an actuator.

A conventional fuel injection device is configured to inject and supply high-pressure fuel stored in a common rail into a combustion chamber of each cylinder of an internal combustion engine via an injector. The injector includes a nozzle that opens and closes the nozzle hole with a needle and injects fuel when the valve is opened, and a piezo actuator that controls the opening and closing operation of the nozzle by controlling the pressure acting on the side of the needle opposite to the nozzle hole ( For example, see Patent Document 1).
JP 2002-257002 A

  Incidentally, there is a fuel injector injector used for an internal combustion engine mounted on a vehicle in which a piezoelectric actuator is assembled from the nozzle side of the injector body in response to a demand for miniaturization.

  Specifically, two lead wires for power feeding are previously joined to the piezo actuator, the lead wire is first inserted into the housing hole of the injector body, and then the piezo actuator is inserted into the housing hole, thereby The wire is pushed by the piezo actuator and advances in the injector body, and the tip of the lead wire is guided to the lead wire take-out hole arranged at the end of the storage hole.

  However, since the lead wire is long and low in rigidity, the lead wire is likely to bend in the housing hole when the lead wire and the actuator are assembled to the injector body, so that it is not easy to guide the lead wire to the lead wire take-out hole. was there.

  The present invention has been made in view of the above points, and it is an object of the present invention to easily lead a lead wire to a lead wire takeout hole.

In the present invention, the actuator (2) and the lead wire (23) are inserted into the storage hole (41) of the injector body (4) from one end side, and the tip of the lead wire (23) is connected to the other end of the storage hole (41). In the injector configured to be taken out from the lead wire take-out hole (94) arranged on the side, the lead wire take-out hole (94) is such that the lead wire (23) is taken out in the axial direction of the injector body (4). A guide hole (75) provided in advance in the storage hole (41) on the other end side before the lead wire (23) is inserted and guiding the other end of the lead wire (23) to the lead wire take-out hole (94). ) Is formed, and a guide member (7) is provided.

  In this way, in the process of inserting the actuator (2) and the lead wire (23) into the storage hole (41), the tip of the lead wire (23) is guided to the guide hole (75) and the lead wire take-out hole ( 94), the lead wire (23) can be easily guided to the lead wire extraction hole (94).

  In this case, the area of the guide hole (75) can be reduced from one end side to the other end side of the storage hole (41).

  In this way, since the guide hole (75) has a large opening area on the inlet side, when the actuator (2) and the lead wire (23) are inserted into the storage hole (41), the tip of the lead wire (23) It is easy to enter the guide hole (75).

  Moreover, the guide hole (75) can be divided into a plurality. In this way, a plurality of lead wires (23) can be reliably guided to the separate lead wire takeout holes (94).

  Further, the lead wire (23) can be held by the holding member (8) having higher rigidity than the lead wire (23).

  This prevents the bending of the lead wire (23) when the actuator (2) and the lead wire (23) are inserted into the storage hole (41), so the actuator (2) and the lead wire (23). Assembling workability to the injector body (4) is improved.

  Further, the holding member (8) can be provided with a partition wall (88) between the plurality of lead wires (23) at a portion where the lead wire (23) is exposed from the holding member (8).

  In this way, in the process of inserting the actuator (2) and the lead wire (23) into the storage hole (41), the exposed portions of the plurality of lead wires (23) in a free state come into contact with each other. Or it can prevent crossing. In other words, the other end of the lead wire (23) can be guided to the guide hole (75) while avoiding contact or crossing between the multiple lead wires (23).

  Moreover, the positioning member (71) which performs positioning of the accommodation hole radial direction in a holding member (8) can be provided.

  By the way, in the process of inserting the actuator (2) and the lead wire (23) into the storage hole (41), if the holding member (8) is tilted in the storage hole (41), the storage hole radial direction of the holding member (8) The position of the lead wire (23) and the guide hole (75) is deviated from the normal positional relationship, but the holding member (8) has a radial direction of the storage hole. By positioning the lead wire (23) and the guide hole (75) held by the holding member (8), the lead wire (23) can be returned to the guide hole (75). It becomes possible to guide reliably.

  Moreover, since the rattling of the holding member (8) is prevented or suppressed by the positioning member (71), the lead wire coating is worn or the lead wire (23) is prevented from being cut by the vibration. Can do.

  Further, the connector housing (92, 93) and the guide member (7) can be integrated. In this way, the number of parts can be reduced.

  Further, the connector housing (92, 93) and the guide member (7) can be separated.

  In this way, for example, if there is a specification in which the mounting angle of the connector (9) with respect to the injector body (4) is different, only one of the connector housing (92, 93) and the guide member (7) is changed. can do.

  Further, the guide member (7) and the positioning member (71) can be integrated. In this way, the number of parts can be reduced.

  In addition, the code | symbol in the bracket | parenthesis of each means described in a claim and this column shows the correspondence with the specific means as described in embodiment mentioned later.

(First embodiment)
A first embodiment of the present invention will be described. FIG. 1 is a partial sectional view of an injector for a fuel injection device according to a first embodiment of the present invention, and FIG. 2 is a schematic sectional view showing a schematic internal configuration of the injector of FIG.

  First, the basic configuration and operation of the injector will be described with reference to FIGS. 1 and 2. The injector injects high-pressure fuel stored in a common rail (not shown) into a cylinder of an internal combustion engine (more specifically, a diesel engine, not shown), and a nozzle 1 that injects fuel when the valve is opened. A piezoelectric actuator 2 that expands and contracts due to charge / discharge of electric charge, and a back pressure control mechanism 3 that is driven by the piezoelectric actuator 2 to control the back pressure of the nozzle 1 are provided.

  The nozzle 1 includes a nozzle body 12 in which an injection hole 11 is formed, a needle 13 that opens and closes the injection hole 11 in contact with and away from the valve seat of the nozzle body 12, and a spring 14 that urges the needle 13 in a valve closing direction.

  The piezoelectric actuator 2 includes a large number of piezoelectric elements 22 stacked in a cylindrical housing 21 made of stainless steel. Two lead wires 23 are connected to the piezoelectric element 22, and the leading ends of the lead wires 23 are joined to the terminals 91 of the connector 9 attached to the end of the injector body 4 opposite to the nozzle. The piezoelectric element 22 is connected to a power source (not shown) via the two lead wires 23, the terminal 91, and the like.

  The connector 9 includes a resin-made first housing 92 integrated with the terminal 91 by insert molding, and a resin-made second housing 93 integrated with the first housing 92 by molding. In addition, the 1st housing 92 and the 2nd housing 93 comprise the connector housing of this invention.

  The first housing 92 is formed with a lead wire extraction hole 94 into which the leading end of the lead wire 23 is inserted. The lead wire extraction hole 94 is connected to a joining piece 95 to which the lead wire 23 is joined at the terminal 91.

  The leading end of the lead wire 23 is guided by the guide member 7 to the lead wire extraction hole 94. The lead wire 23 is held by the holding member 8 having higher rigidity than the lead wire 23. Further, the holding member 8 is positioned by the guide member 7. Details of the guide member 7 and the holding member 8 will be described later.

  The valve body 31 of the back pressure control mechanism 3 is driven by a piston 32 that moves following the expansion and contraction of the piezoelectric actuator 2, a disc spring 33 that biases the piston 32 toward the piezoelectric actuator 2, and a piston 32. A spherical valve element 34 is accommodated. Incidentally, in FIG. 2, the valve body 31 is illustrated as one component, but is actually divided into a plurality of parts.

  The substantially cylindrical injector body 4 is formed with a storage hole 41 penetrating from one end side to the other end side in the injector axial direction. The piezoelectric actuator 2 and the back pressure control mechanism 3 are stored in the storage hole 41. Has been. Further, the nozzle 1 is held at the end of the injector body 4 by screwing the substantially cylindrical retainer 5 into the injector body 4.

  The nozzle body 12, the injector body 4, and the valve body 31 are formed with a high-pressure passage 6a to which high-pressure fuel is always supplied from the common rail. The injector body 4 and the valve body 31 are connected to a fuel tank (not shown). 6b is formed.

  A high pressure chamber 15 is formed between the outer peripheral surface of the needle 13 on the nozzle hole 11 side and the inner peripheral surface of the nozzle body 12. The high pressure chamber 15 communicates with the nozzle hole 11 when the needle 13 is displaced in the valve opening direction. The high pressure chamber 15 is always supplied with high pressure fuel via the high pressure passage 6a. A back pressure chamber 16 is formed on the side opposite to the injection hole of the needle 13. In the back pressure chamber 16, the above-described spring 14 is disposed.

  The valve body 31 is formed with a high-pressure seat surface 35 in a path communicating the high-pressure passage 6 a in the valve body 31 and the back pressure chamber 16 of the nozzle 1, and the back of the low-pressure passage 6 b in the valve body 31 and the nozzle 1. A low-pressure seat surface 36 is formed in a path communicating with the pressure chamber 16. The valve body 34 described above is disposed between the high pressure seat surface 35 and the low pressure seat surface 36.

  In the above configuration, when the piezo actuator 2 is contracted, the valve body 34 is in contact with the low pressure seat surface 36 and the back pressure chamber 16 is connected to the high pressure passage 6a as shown in FIG. Fuel pressure is introduced. The needle 13 is urged in the valve closing direction by the fuel pressure in the back pressure chamber 16 and the spring 14 to close the nozzle hole 11.

  On the other hand, when a voltage is applied to the piezo actuator 2 and the piezo actuator 2 is extended, the valve body 34 is in contact with the high pressure seat surface 35 and the back pressure chamber 16 is connected to the low pressure passage 6b. become. The needle 13 is urged in the valve opening direction by the fuel pressure in the high-pressure chamber 15 to open the injection hole 11, and fuel is injected from the injection hole 11 into the cylinder of the internal combustion engine.

  Next, a specific configuration of the injector of this embodiment will be described. FIG. 3 is a cross-sectional view taken along the line AA in FIG. 1, and FIG. 4 is a cross-sectional view of the main part showing the assembly process of the injector in FIG.

  As shown in FIGS. 3 and 4, the storage hole 41 of the injector body 4 includes four cylindrical storage holes 41 a to 41 d. One end of the first storage hole 41 a opens at the nozzle side end face of the injector body 4, and extends from the nozzle side end face of the injector body 4 toward the opposite nozzle side of the injector body 4.

  The second storage hole 41b has a smaller diameter than the first storage hole 41a, and extends from the end on the non-nozzle side of the first storage hole 41a toward the anti-nozzle side of the injector body 4. The first storage hole 41a and the second storage hole 41b are arranged coaxially.

  The third storage hole 41c is provided eccentrically with respect to the first storage hole 41a and the second storage hole 41b. One end of the third storage hole 41c is connected to the second storage hole 41b and extends toward the non-nozzle side of the injector body 4. .

  The fourth storage hole 41d is provided eccentrically with respect to the third storage hole 41c, one end is opened on the end surface on the side opposite to the nozzle of the injector body 4, and the other end is connected to the third storage hole 41c. The axes of the four storage holes 41a to 41d are parallel to the injector axis.

  The piezoelectric actuator 2 is stored in the first storage hole 41a, and the lead wire 23 and the holding member 8 are stored in the second storage hole 41b and the third storage hole 41c. A guide member 7 is disposed in the third storage hole 41c and the fourth storage hole 41d.

  Further, the tapered seat surface 25 formed in the housing 21 of the piezo actuator 2 abuts on the stepped portion 41d of the first storage hole 41a and the second storage hole 41b, and the piezo actuator 2 is positioned on the injector body 4. It is supposed to be fixed.

  Next, the holding member 8 will be described. FIG. 5 is an external view showing the holding member 8 of FIG. 1, and FIG. 6 is a view of the holding member 8 of FIG.

  The holding member 8 is made of a material having a hardness lower than that of a metal, for example, a resin such as nylon, in order to prevent the coating of the lead wire 23 from being worn. In addition, the holding member 8 has a shape, a thickness, and the like set so that the rigidity is higher than that of the lead wire 23.

  As shown in FIGS. 5 and 6, the holding member 8 has a columnar fixing portion 81 on one end side, and a through hole 82 into which the lead wire 23 is inserted is formed in the fixing portion 81. Yes. A cylindrical first guide portion 83 is formed continuously with the fixed portion 81, and a slightly flat second guide portion 84 is formed continuously with the first guide portion 83. The fixed portion 81 and the first guide portion 83 are arranged coaxially, and the second guide portion 84 is provided eccentrically with respect to the fixed portion 81 and the first guide portion 83.

  When the injector body 4 is viewed in the axial direction of the injector, the portion where the second storage hole 41b and the third storage hole 41c overlap is an ellipse (see FIG. 3), and the second guide portion 84 of the holding member 8 is within this ellipse. The cross-sectional shape and dimensions of the second guide portion 84 of the holding member 8 are set so as to fit.

  Two grooves 85 into which the lead wires 23 are inserted are formed on the outer peripheral side surfaces of the guide portions 83 and 84 so as to extend along the longitudinal direction of the holding member 8. The groove 85 is continuous with the through hole 82.

  One groove 85 and the other groove 85 are opened in directions different from each other by 180 ° on the outer peripheral side surfaces of the guide portions 83 and 84. In other words, the one groove 85 and the other groove 85 are formed in an elliptical major axis direction in which the second storage hole 41b and the third storage hole 41c overlap in a state where the holding member 8 and the piezoelectric actuator 2 are assembled to the injector body 4. (See FIG. 3).

  Further, the two grooves 85 are arranged side by side in the major axis direction of the elliptical shape in which the second storage hole 41b and the third storage hole 41c overlap, so that the distance L1 between the two grooves 85 is as large as possible.

  As shown in FIG. 4, the fixing member 81 is inserted into the cylindrical tube portion 24 formed in the housing 21 of the piezo actuator 2, and the end portion of the tube portion 24 is caulked, whereby the holding member 8 is moved to the piezo actuator 2. It is supposed to be fixed to.

  Next, the guide member 7 will be described. FIG. 7 is an enlarged view of a portion C in FIG. 1, and FIG.

  As described in detail below, the guide member 7 has a positioning function for positioning the holding member 8 and a guide function for guiding the tip of the lead wire 23 to the lead wire extraction hole 94.

  As shown in FIG. 7, the guide member 7 is disposed in the fourth storage hole 41d and the third storage hole 41c. The guide member 7 includes a plate portion 71 extending in the axial direction of the third storage hole 41c and the fourth storage hole 41d (hereinafter referred to as the storage hole axial direction). The plate portion 71 corresponds to the positioning member of the present invention.

  Here, as shown in FIG. 3, when the injector body 4 is viewed in the direction of the injector axis, the portion where the second storage hole 41b and the third storage hole 41c overlap is an ellipse, and the second of the third storage holes 41c is the second. The portion that does not overlap the storage hole 41b has a crescent shape. Further, a cross section of the plate portion 71 perpendicular to the storage hole axis is substantially congruent with a crescent-shaped portion of the third storage hole 41c that does not overlap the second storage hole 41b. And this board part 71 is arrange | positioned in the crescent-shaped part which does not overlap with the 2nd accommodation hole 41b among the 3rd accommodation holes 41c.

  As shown in FIGS. 7 and 8, a first tapered surface 72 that is inclined with respect to the axis of the storage hole is formed continuously with the plate portion 71 on the opposite nozzle side of the plate portion 71, and this first taper is formed. The front end of the holding member 8 comes into contact with the surface 72. Accordingly, the position of the third storage hole 41c in the holding member 8 in the radial direction (hereinafter referred to as the storage hole radial direction) is determined.

  On the nozzle side of the plate portion 71, a second tapered surface 73 that is inclined with respect to the storage hole axis is formed continuously with the plate portion 71. In the process of pushing the piezo actuator 2 and the like into the storage hole 41, when the holding member 8 is inclined in the storage hole 41, the tip of the holding member 8 slides on the second tapered surface 73 and advances. It has become.

  The guide member 7 includes a columnar shaft portion 74 that is inserted into the fourth storage hole 41d. The shaft portion 74 is formed with a guide hole 75 that connects the third storage hole 41 c and the lead wire extraction hole 94 to guide the tip of the lead wire 23 to the lead wire extraction hole 94.

  The guide hole 75 is divided into two so that the two lead wires 23 are inserted one by one, and the two guide holes 75 are arranged in parallel to the storage hole axis. The entire shape of the guide hole 75 is such that the funnel is divided into, for example, eight along its axis, and the area is reduced from the nozzle side toward the non-nozzle side. The nozzle-side opening in the guide hole 75 (that is, the communication portion with the third storage hole 41c) 75a has a fan shape, and is sized so that the communication area with the third storage hole 41c is as large as possible. The arrangement is set so that the positional deviation of the lead wire 23 can be absorbed.

  Further, when the injector body 4 is viewed in the axial direction of the injector, the one opening portion 75a and the one groove 85 of the holding member 8 are overlapped with each other, and the other opening portion 75a and the other groove 85 of the holding member 8 are also Overlapping positional relationship.

  A lead wire through hole 75 b on the side opposite to the nozzle in the guide hole 75 communicates with the lead wire extraction hole 94. Further, the opening 75a and the lead wire through hole 75b are connected by a third tapered surface 75c.

  Next, the assembly of the holding member 8 and the piezoelectric actuator 2 and the assembly of the holding member 8 and the piezoelectric actuator 2 to the injector body 4 will be described.

  First, the lead wire 23 is inserted into the through hole 82. Next, after the fixing portion 81 is inserted into the housing 21, the lead wire 23 is inserted into the groove 85. At this time, the tip of the lead wire 23 is exposed from the groove 85 by about 10 mm. Thereafter, the holding member 8 and the piezoelectric actuator 2 are integrated by crimping the end of the housing 21.

  Next, the integrated holding member 8 and piezo actuator 2 are assembled to the injector body 4 as follows.

  As shown in FIG. 4, first, the lead wire 23 and the distal end portion of the holding member 8 are inserted from the nozzle side opening in the storage hole 41. Subsequently, the piezo actuator 2 is inserted so as to be pushed into the storage hole 41. Here, the lead wire 23 is held by the highly rigid holding member 8 except for its tip, and the tip of the lead wire 23 not held by the holding member 8 is as short as about 10 mm. In the process of being pushed into the storage hole 41, bending of the lead wire 23 is prevented. Therefore, as the piezo actuator 2 is pushed into the storage hole 41, the lead wire 23 and the holding member 8 can smoothly advance in the storage hole 41.

  When the piezo actuator 2 is pushed to a position where the seating surface 25 of the piezo actuator 2 comes into contact with the stepped portion 41 d of the injector body 4, the leading end of the lead wire 23 reaches the vicinity of the opening opposite to the nozzle in the accommodation hole 41. It has come to go.

  Here, in the process of pushing the piezo actuator 2 and the like into the storage hole 41, if the holding member 8 is tilted in the storage hole 41, the position of the holding member 8 in the radial direction of the storage hole is shifted from the normal position. Although the positional relationship between the distal end portion of the lead wire 23 and the guide hole 75 deviates from the normal positional relationship, in this embodiment, the normal positional relationship can be restored as follows. In the present embodiment, when the injector body 4 is viewed in the injector axial direction, the inside of the ellipse where the second storage hole 41b and the third storage hole 41c overlap is the normal position of the holding member 8 in the storage hole radial direction. .

  In FIG. 7, first, the distal end portion of the holding member 8 comes into contact with the second tapered surface 73. The position of the holding member 8 in the radial direction of the storage hole is gradually corrected as the tip of the holding member 8 advances by sliding on the second tapered surface 73. In a state where the tip end portion of the holding member 8 has passed through the second tapered surface 73, the position in the storage hole radial direction in the holding member 8 is returned to the normal position by the plate portion 71. Eventually, the position of the holding member 8 in the radial direction of the storage hole is determined by the front end of the holding member 8 coming into contact with the first tapered surface 72. Thus, by positioning the holding member 8 in the radial direction of the storage hole, the positional relationship between the leading end portion of the lead wire 23 and the guide hole 75 is returned to the normal positional relationship, and the leading end portion of the lead wire 23 is The guide hole 75 is reliably guided.

  In addition, the tip of the lead wire 23 is guided to the lead wire take-out hole 94 in parallel with the return of the position of the holding member 8 in the radial direction of the storage hole to the normal position. That is, in the process of pushing the piezo actuator 2 and the like into the housing hole 41, the leading end of the lead wire 23 enters the guide hole 75 from the opening 75a and slides on the third taper surface 75c to advance the lead wire. It is guided to the through hole 75b and further to the lead wire extraction hole 94. The leading end of the lead wire 23 is guided to the joining piece 95 through the lead wire take-out hole 94.

  Thereafter, the tip of the lead wire 23 is joined to the joining piece 95, and the second housing 93 is molded as shown in FIG.

  According to the present embodiment, in the process of pushing the piezo actuator 2 and the like into the storage hole 41, the leading end portion of the lead wire 23 can be easily guided to the lead wire extraction hole 94 by the guide hole 75.

  Further, by positioning the holding member 8 in the housing hole radial direction, the positional relationship between the distal end portion of the lead wire 23 and the guide hole 75 is returned to the normal positional relationship, that is, the injector body 4 is moved in the injector axial direction. In view of the fact that the opening 75a of the guide hole 75 and the groove 85 of the holding member 8 overlap each other and the opening area of the opening 75a is large, the piezoelectric actuator 2 and the like In the process of pushing the into the storage hole 41, the leading end portion of the lead wire 23 easily enters the guide hole 75.

  In addition, since the lead wire 23 is held by the holding member 8 having high rigidity, the lead wire 23 is prevented from being bent when the piezoelectric actuator 2 or the like is assembled to the injector body 4. Assembly workability is improved.

  Further, when the distal end portion of the holding member 8 comes into contact with the first tapered surface 72, a force in the housing hole radial direction acts on the holding member 8, and it is possible to reliably prevent the holding member 8 from rattling. it can. Therefore, it is possible to prevent the lead wire 23 from being worn or the lead wire 23 from being cut by vibration.

  Further, since the holding member 8 is made of resin, it is possible to prevent the coating of the lead wire 23 from being rubbed and worn with the holding member 8 as compared with the case where the holding member 8 is made of metal having a higher hardness than the resin.

  In addition, since the two grooves 85 are arranged side by side in the major axis direction of the elliptical shape in which the second storage hole 41b and the third storage hole 41c overlap, the distance L1 between the two grooves 85 is as large as possible. The distance between the two terminals 91 to which the two lead wires 23 are joined can be increased, and interference between the two terminals 91 can be reliably avoided.

  Further, since the guide member 7 and the first housing 92 are separate bodies, for example, when there is a specification in which the connector 9 is attached to the injector body 4 at different angles, only one of the guide member 7 and the first housing 92 is changed. Can respond.

  Further, since the guide member 7 and the positioning member 71 are integrated, the number of parts can be reduced.

(Second Embodiment)
A second embodiment of the present invention will be described. FIG. 9 is a cross-sectional view showing a holding member and a piezoelectric actuator in an injector according to the second embodiment, and FIG. 10 is a cross-sectional view taken along the line EE of FIG. In addition, the same code | symbol is attached | subjected to the same or equivalent part as 1st Embodiment, and the description is abbreviate | omitted.

  The holding member 8 of this embodiment shown in FIGS. 9 and 10 is formed by insert molding. Specifically, the piezo actuator 2 and the lead wire 23 are set at predetermined positions of the molding die, and the holding member 8 is molded by pouring molding resin. Incidentally, the hole 87 is a mark of a pin provided in the mold for positioning the lead wire 23 at the time of molding.

  Since the lead wire 23 taken out from the piezo actuator 2 is embedded in the holding member 8 except for its tip, the coating of the lead wire 23 rubs against the metal injector body 4 and wears. Can be prevented.

(Third embodiment)
A third embodiment of the present invention will be described. FIG. 11 is a cross-sectional view showing a holding member and a piezoelectric actuator in an injector according to the third embodiment, and FIG. 12 is a cross-sectional view taken along the line FF of FIG. In addition, the same code | symbol is attached | subjected to the same or equivalent part as 2nd Embodiment, and the description is abbreviate | omitted.

  As shown in FIGS. 11 and 12, a resin seal cap 100 is inserted into the housing 21 of the piezo actuator 2 in order to prevent molding resin from entering the housing 21 during insert molding. Yes. The lead wire 23 extends from the piezo actuator 2 and is taken out of the piezo actuator 2 through a through hole in the seal cap 100. In order to position the tip of the lead wire 23 during insert molding, a resin positioning member 110 is attached to the tip of the lead wire 23.

  Then, the piezoelectric actuator 2 with the seal cap 100 attached is set at a predetermined position of the mold, and the positioning member 110 with the lead wire 23 inserted is set at a predetermined position of the mold, and then a molding resin is poured into the mold. The holding member 8 is formed.

(Fourth embodiment)
A fourth embodiment of the present invention will be described. 13 is a cross-sectional view of the vicinity of the connector in the injector according to the fourth embodiment, FIG. 14 is a cross-sectional view of the connector and guide member of FIG. 13, and FIG. 15 is a cross-sectional view of the holding member and lead wire of FIG. In addition, the same code | symbol is attached | subjected to the same or equivalent part as 1st Embodiment, and the description is abbreviate | omitted.

  The holding member 8 shown in FIG. 15 is formed by insert molding similarly to the second embodiment. A thin plate-shaped partition wall 88 is formed at the end of the holding member 8 opposite to the nozzle. The partition wall 88 is disposed between the two lead wires 23 at a portion where the two lead wires 23 are exposed from the holding member 8. The height of the partition wall 88 (ie, the dimension in the storage hole axial direction) is substantially the same as the length of the exposed portion of the lead wire 23, and the width of the partition wall 88 (ie, the dimension in the storage hole radial direction) is It is set sufficiently larger than the diameter of the covering portion.

  As shown in FIG. 14, the guide member 7 is formed integrally with the first housing 92. The guide holes 75 are funnel-shaped, and each include one opening 75a, a third tapered surface 75c, and two lead wire through holes 75b. A partition wall insertion hole 76 into which the partition wall 88 is inserted is formed between the two lead wire through holes 75b. As shown in FIG. 13, the second housing 93 is also formed with a partition insertion hole 96 into which the partition 88 is inserted.

  Next, assembly of the holding member 8 and the piezoelectric actuator 2 (see FIG. 1) to the injector body 4 will be described.

  First, the lead wire 23 and the distal end portion of the holding member 8 are inserted from the nozzle side opening in the storage hole 41. Subsequently, when the piezo actuator 2 is inserted so as to be pushed into the storage hole 41, the leading end portion of the lead wire 23 and the partition wall 88 enter the guide hole 75 from the opening 75a, and the partition wall 88 further enters the partition wall insertion holes 76 and 96. The leading end of the lead wire 23 is guided to the third taper surface 75c, guided to the lead wire through hole 75b, and further guided to the joining piece 95 through the lead wire takeout hole 94.

  Since the partition wall 88 is provided, the exposed portions of the two lead wires 23 in a free state come into contact with each other or cross each other in the process of pushing the piezoelectric actuator 2 or the like into the storage hole 41. Can be prevented. In other words, the tip end portion of the lead wire 23 can be guided to the guide hole 75 in a state in which contact or intersection between the two lead wires 23 is avoided.

  Further, since the guide member 7 and the first housing 92 are integrated, the number of parts can be reduced.

(Fifth embodiment)
A fifth embodiment of the present invention will be described. 16 is a cross-sectional view of the vicinity of the connector in the injector according to the fifth embodiment, and FIG. 17 is a cross-sectional view taken along the line GG of FIG. In addition, the same code | symbol is attached | subjected to the same or equivalent part as 4th Embodiment, and the description is abbreviate | omitted.

  As shown in FIGS. 16 and 17, the portion from the opening 75 a to the third tapered surface 75 c in the guide member 7 has a circular cross-sectional shape in the storage hole radial direction. Similarly, the cross-sectional shape in the radial direction of the storage hole is also circular at the opposite end of the holding member 8 on the nozzle side. Further, the plate portion 71 (see FIG. 7) is omitted by lengthening the portion extending from the opening 75a to the third tapered surface 75c to provide a positioning function for positioning the holding member 8.

  Also in this embodiment, since the partition wall 88 is provided, the exposed portions of the two lead wires 23 that are in a free state come into contact with or intersect each other in the process of pushing the piezoelectric actuator 2 and the like into the storage hole 41. Can be prevented. In other words, the tip end portion of the lead wire 23 can be guided to the guide hole 75 in a state in which contact or intersection between the two lead wires 23 is avoided.

(Other embodiments)
In the first embodiment, the holding member 8 is fixed to the piezo actuator 2 by caulking the cylindrical portion 24 formed in the housing 21 of the piezo actuator 2, but the holding member 8 is fixed to the cylindrical portion 24 of the housing 21. The holding member 8 may be fixed to the piezo actuator 2 by press-fitting the fixing portion 81.

  In each of the above embodiments, the back pressure control mechanism 3 is driven by the piezo actuator 2 to control the back pressure of the nozzle 1, but the back pressure control mechanism 3 is driven by an electromagnetic solenoid as an actuator to The back pressure of 1 may be controlled.

  In the first embodiment, the lead wire take-out hole 94 is formed in the first housing 92. However, the lead wire take-out hole 94 may be formed at the bottom of the bottomed injector body 4.

It is a fragmentary sectional view of the injector for fuel injection equipment concerning a 1st embodiment of the present invention. It is typical sectional drawing which shows the schematic internal structure of the injector of FIG. It is sectional drawing which follows the AA line of FIG. It is sectional drawing of the principal part which shows the assembly | attachment process of the injector of FIG. It is an external view which shows the holding member of FIG. It is a B arrow view of the holding member of FIG. It is an expanded sectional view of the C section of FIG. It is a D arrow line view of the guide member of FIG. It is sectional drawing which shows the holding member and piezoelectric actuator in the injector which concern on 2nd Embodiment of this invention. It is sectional drawing which follows the EE line | wire of FIG. It is sectional drawing which shows the holding member and piezoelectric actuator in the injector which concern on 3rd Embodiment of this invention. It is sectional drawing which follows the FF line of FIG. It is sectional drawing of the connector vicinity in the injector which concerns on 4th Embodiment of this invention. It is sectional drawing of the connector and guide member of FIG. It is sectional drawing of the holding member of FIG. 13, and a lead wire. It is sectional drawing of the connector vicinity in the injector which concerns on 5th Embodiment of this invention. It is sectional drawing which follows the GG line of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Nozzle, 2 ... Actuator, 4 ... Injector body, 7 ... Guide member, 23 ... Lead wire, 41 ... Storage hole, 75 ... Guide hole, 94 ... Lead wire extraction hole.

Claims (11)

  1. A cylindrical injector body (4) having a storage hole (41) formed from one end side to the other end side in the axial direction;
    An actuator (2) housed in the housing hole (41);
    A power supply lead wire (23) having one end joined to the actuator (2);
    A nozzle (1) that opens or closes according to the energization state of the actuator (2) and injects fuel when the valve is opened;
    The actuator (2) and the lead wire (23) are inserted into the accommodation hole (41) from one end side, and the other end of the lead wire (23) is provided at the other end side of the accommodation hole (41). Injector configured to be taken out from the lead wire takeout hole (94),
    The lead wire extraction hole (94) is provided so that the lead wire (23) is extracted in the axial direction of the injector body (4),
    A guide hole ( preliminarily disposed on the other end side before insertion of the lead wire (23) in the storage hole (41) and guiding the other end of the lead wire (23) to the lead wire extraction hole (94) ( 75) A guide member (7) formed with 75).
  2. The injector according to claim 1, wherein an area of the guide hole (75) is reduced from one end side to the other end side of the storage hole (41).
  3. The lead wire (23) has a plurality,
    The injector according to claim 1 or 2, wherein the guide hole (75) is divided into a plurality of sections corresponding to the lead wires (23).
  4. The injector according to claim 3, wherein a partition wall (88) is provided between the lead wires (23).
  5. The injector according to any one of claims 1 to 4, further comprising a holding member (8) for holding the lead wire (23).
  6. A holding member (8) for holding the lead wire (23), and the other end of the lead wire (23) is exposed from the holding member (8);
    The said holding member (8) is provided with the said partition (88) in the site | part which the said lead wire (23) exposed from the said holding member (8), and the said lead wire (23). 4. The injector according to 4.
  7. The injector according to claim 5 or 6, wherein the holding member (8) has higher rigidity than the lead wire (23).
  8. The injector according to any one of claims 5 to 7, further comprising a positioning member (71) for positioning the holding member (8) in the radial direction of the storage hole.
  9. A connector (9) having a terminal (91) to which the lead wire (23) is joined and a connector housing (92, 93) for holding the terminal (91) is provided on the other end side of the injector body (4). Arranged,
    9. Injector according to any one of the preceding claims, characterized in that the connector housing (92, 93) and the guide member (7) are integral.
  10. A connector (9) having a terminal (91) to which the lead wire (23) is joined and a connector housing (92, 93) for holding the terminal (91) is provided on the other end side of the injector body (4). Arranged,
    9. The injector according to claim 1, wherein the connector housing (92, 93) and the guide member (7) are separate bodies.
  11. The injector according to claim 8, wherein the guide member (7) and the positioning member (71) are integrated.
JP2006103910A 2006-04-05 2006-04-05 Injector Active JP4506709B2 (en)

Priority Applications (1)

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JP2006103910A JP4506709B2 (en) 2006-04-05 2006-04-05 Injector
DE102007000194.2A DE102007000194B4 (en) 2006-04-05 2007-03-30 Injector

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JP4506709B2 true JP4506709B2 (en) 2010-07-21

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Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009287394A (en) * 2008-05-27 2009-12-10 Mitsuba Corp Fuel supply device
JP4983775B2 (en) * 2008-11-21 2012-07-25 株式会社デンソー Injector
JP5120318B2 (en) 2009-04-03 2013-01-16 株式会社デンソー Fuel injection valve
JP5278120B2 (en) 2009-04-03 2013-09-04 株式会社デンソー Fuel injection device
JP5120317B2 (en) * 2009-04-03 2013-01-16 株式会社デンソー Fuel injection device
JP5120316B2 (en) * 2009-04-03 2013-01-16 株式会社デンソー Fuel injection device

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JP2005500470A (en) * 2001-08-20 2005-01-06 ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツングRobert Bosch Gmbh Fuel injection valve
WO2005073547A1 (en) * 2004-01-30 2005-08-11 Robert Bosch Gmbh Cable leadthrough and fuel system part with a cable leadthrough
JP2006077666A (en) * 2004-09-09 2006-03-23 Denso Corp Piezoactuator device

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US5059857A (en) 1990-09-28 1991-10-22 Caterpillar Inc. Integral connector for a piezoelectric solid state motor stack
JP4304895B2 (en) 2000-12-28 2009-07-29 株式会社デンソー Hydraulic control valve and fuel injection valve
EP1445470A1 (en) 2003-01-24 2004-08-11 Siemens VDO Automotive S.p.A. Metering device with an electrical connector

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Publication number Priority date Publication date Assignee Title
JP2005500470A (en) * 2001-08-20 2005-01-06 ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツングRobert Bosch Gmbh Fuel injection valve
WO2005073547A1 (en) * 2004-01-30 2005-08-11 Robert Bosch Gmbh Cable leadthrough and fuel system part with a cable leadthrough
JP2006077666A (en) * 2004-09-09 2006-03-23 Denso Corp Piezoactuator device

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DE102007000194A1 (en) 2007-10-11
DE102007000194B4 (en) 2018-08-23

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