Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
  • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
  • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
  • F02M2200/16—Sealing of fuel injection apparatus not otherwise provided for
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
  • F02M2200/70—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger
  • F02M2200/703—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
  • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
  • F02M2200/8023—Fuel injection apparatus manufacture, repair or assembly the assembly involving use of quick-acting mechanisms, e.g. clips
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M2547/00—Special features for fuel-injection valves actuated by fluid pressure
  • F02M2547/001—Control chambers formed by movable sleeves
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
  • F02M47/02—Fuel-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
  • F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M63/00—Other 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
  • F02M63/0012—Valves
  • F02M63/0014—Valves characterised by the valve actuating means
  • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
  • F02M63/0026—Valves characterised by the valve actuating means electrical, e.g. using solenoid using piezoelectric or magnetostrictive actuators
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M63/00—Other 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
  • F02M63/0012—Valves
  • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
  • F02M63/004—Sliding valves, e.g. spool valves, i.e. whereby the closing member has a sliding movement along a seat for opening and closing
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M63/00—Other 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
  • F02M63/0012—Valves
  • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
  • F02M63/0045—Three-way valves

Definitions

• DE 196 50 865 A1 relates to a solenoid valve for controlling the fuel pressure in a control chamber of an injection valve, such as a common rail high-pressure accumulator injection system. Via the fuel pressure in the control chamber, a stroke movement of a valve piston is controlled, with which an injection opening of the injection valve is opened or closed.
• the solenoid valve comprises an electromagnet, a movable armature and a valve member which is moved with the armature and acted upon by a valve closing spring in the closing direction and which cooperates with the valve seat of the solenoid valve and thus controls the fuel drain from the control chamber.
• a screw connection is realized by means of a union nut which connects a nozzle body, a throttle plate resting thereon and a valve plate of a fuel injector with the holding body of the fuel injector. It is initially of minor importance, whether the fuel injector is actuated by means of a piezoelectric actuator or by means of a solenoid valve.
• a sealing ring which is preferably made of PTFE, is used to achieve a seal of the low pressure area of the fuel injector to the outside.
• a thread is formed on the inside of the nozzle retaining nut.
• a non-threaded sealing bandage made of holding body and nozzle retaining nut, by the geometric shape of the fixation a higher surface pressure can be realized and a sealing bandage is provided, in which unintentional opening is prevented by a radial locking of a sleeve-shaped sealing element.
• the proposed connection between a holding body of a fuel injector and the components associated with a nozzle body of the fuel injector by means of a sleeve-shaped locking element has the advantage that higher surface pressures on the resulting sealing surfaces in the sealing compound are possible, such.
• sleeve-shaped locking element the thread on the inside and the external thread on the holding body can be omitted. Instead, only a locking and mounting groove on the sleeve-shaped locking element and a corresponding locking groove on the holding body are provided.
• the locking between the sleeve-shaped locking element and the holding body takes place via a number of locking segments, which are formed tongue-shaped on one of the end regions of the sleeve-shaped locking element.
• a defined locking force can be generated.
• the height of the axial force introduced into the sealing dressing depends on a height difference between the bearing surface of the nozzle body and locking lugs in combination with the rigidity of the resilient region.
• sleeve-shaped locking element a circumferential position orientation of the previously used nozzle lock nut, which affects the assembly time low.
• fixing pins Due to the avoidance of a relative movement in the circumferential direction by the elimination of the screw and the risk of shearing is omitted for fixing pins, which may be required for correct installation of the valve and the throttle plate. If, on the other hand, the valve plate and the throttle plate are oriented in the correct position relative to one another, the use of fixing pins can be completely dispensed with.
• NEN low-pressure seals are integrated into the nozzle retaining nut, so that previously used, preferably made of PTFE seals for low pressure sealing can be omitted.
• FIG. 1 shows a schematic representation of essential elements of a fuel injector according to the prior art
• FIG. 3 a representation of a nozzle tensioning element of the fuel injector proposed according to the invention
• Detail B shows a plan view of the locking elements arranged on the nozzle clamping element according to FIG. 3,
• FIG. 4 shows a development of an expansion region on the nozzle clamping element according to the illustration in FIG. 3,
• FIG. 5 shows a side view of the expansion region of the nozzle tensioning element, shown in unwound form in FIG. 4, with recesses, FIG.
• FIG. 6.1 a locking segment before snapping into a latching groove
• FIG. 6.2 shows a locking segment latched in a latching groove
• Figure 6.3 shows a disassembly tool for mounting the nozzle clamping element from the holding body
• Figure 7 is a representation of a erf ⁇ ndungshiel proposed fuel injector with mounted on the holder body according to the invention nozzle tensioning element.
• FIG. 1 shows that the fuel injector 10 known from the prior art has an electrical contact 12 in the head region.
• the fuel injector 10 comprises a holding body 14 and a nozzle retaining nut 16 provided with an internal thread.
• a valve plate 18 and a throttle plate 20 and a nozzle body 22 are sealingly clamped to one another in the context of a screw connection 24 the fuel injector 10 forms a compact unit.
• enlarged detail of the fuel injector 10 shows that the nozzle retaining nut 16 includes a fine thread 40 on the inside, which cooperates with a corresponding formed on the outer peripheral surface of the holding body 14 thread and the screw 24 forms. In the lower region of the nozzle retaining nut 16, this comprises at least one key surface 26, which serves for the attachment of a torque applying tool.
• a high-pressure inlet 30 which extends through the valve plate 18 and through the throttle plate 20.
• valve plate 18, throttle plate 20 are employed on the end face of the nozzle body 22 and form a screw connection.
• a control chamber 32 is formed by a control space sleeve 34, which is employed by means of a spring 36 to the underside of the throttle plate 20.
• the spring 36 surrounds a, preferably needle-shaped injection valve member 38, wherein the spring 36 is supported on a received by the injection valve member 38 ring.
• the nozzle retaining nut 16 is screwed by means of the fine thread 40 with the holding body 14 of the fuel injector 10.
• FIG. 2 shows a section through the nozzle retaining nut.
• FIG. 2 shows that the nozzle retaining nut 16 shown in a perspective section comprises the fine thread 40 on the inside in the head region and has at least one key recess 26 on the outer circumference for attachment of a tool applying a torque.
• the nozzle retaining nut 16 shown in FIG. 2 comprises a first diameter D 1J , a second inner diameter D 12 and a third inner diameter D 13 .
• the wall thicknesses Sl, S2 and S3 pointing downwards in the direction of the at least one key area 26 increases.
• FIG. 3 shows a longitudinal section through the nozzle clamping element proposed according to the invention. From the sectional view according to FIG. 3 and the associated details A, B, C and D, it can be seen that the nozzle tensioning element 16 contains a fixing region 42 indicated by reference number 42 in its head region. Seen in the vertical direction, a number of locking tongues 44 extend within the fixing region 42 along the circumference of the nozzle clamping element 16 proposed according to the invention.
• Each of the locking tongues 44 comprises on the inside, ie. H. on the outer circumference of the holding body 14 facing surface, a projection 46 which is preferably hook-shaped.
• the locking tabs are separated from each other by gaps 48 to provide radial plasticity.
• the gaps 48 between the individual locking tongues 44 in the fixing region 42 of the nozzle clamping element 16 are represented in detail "C" on an enlarged scale.
• a first spherical shape 50 is formed on the inner peripheral surface of the nozzle chuck 16. This is within the range of the nozzle clamping element 16 (see illustration according to Figure 2), in which this the first inner diameter D 1; 1 has.
• a mounting groove 58 is formed on the outer circumference of the nozzle clamping element 16 and the second spherical shape 52 on the inner circumferential surface.
• FIG. 7 Details of the mounting groove 58 are shown in detail Below the second spherical shape 52 of the nozzle clamping element 16 there is a zone in which recesses 66 are annularly mounted in a perforation pattern 62, which in the schematic embodiment variant of the nozzle clamping element shown in FIG Eight have. Below the region provided with the perforation pattern 62 extends a bearing surface 54 on which the shoulder of the nozzle body 22 is supported in the mounted state (compare illustration according to FIG. 7).
• the projection 46 of the locking tongue 44 is formed in a projection c with respect to the inner side of the locking tongue 44 and engages in a latching groove 46 formed on the outer circumference of the retaining body 14.
• the angle of inclination is designated ⁇ in that the projection 46 extends on the locking tongue 44.
• the strength of the resilient region of the locking tongue 44 is selected to an extent which exceeds the projection c.
• the detailed representation "B” can be taken from the fact that a multiplicity of locking tongues 44 are arranged adjacent to one another in the circumferential direction along the circumference of the head region of the nozzle tensioning element 16 shown in Figure 3.
• Each of the locking tongues 44 is comparable to the respectively adjacent locking tongue 44 via a gap 48 Detail “C”, separated.
• a projection 46 is formed which engages in the locking groove 56 formed circumferentially on the holding body 14.
• a mounting tool 60 can be latched into the mounting groove 58 shown in FIG. 3 on the outer peripheral surface of the nozzle clamping element 16.
• the mounting tool 60 is inserted from below into the mounting groove 58 on the outer circumference of the nozzle clamping element 16 and e designates the mounting groove depth, in which the base of the mounting groove 58 is formed in comparison to the outer circumferential surface of the nozzle tensioning element 16.
• the inner peripheral surface of the nozzle tensioning element is opposite the second spherical shape.
• the nozzle clamping element 16 is locked at the upper end within the fixing region 42 by the locking tongues 44 with respect to the holding body 14.
• the nozzle tensioning element 16 is pushed from below over the correctly positioned to each other injector components, nozzle body 22, throttle plate 20, valve plate 18 and holding body 14 during assembly of the injector composite.
• the geometric coordination of the individual components relative to one another ensures that in the latched state of the locking tongues 44 within the fixing region 42 and the latching groove 56 on the holding body 14 a bias builds up.
• the amount of this preload force can be determined by the geometry of the components over the slope. F ⁇ gkeit the nozzle clamping element 16 within the Lochungsmuster Kunststoffes 62 (Dehn Switzerland) are set with high process reliability.
• FIG. 4 shows that the region illustrated in FIG. 3, in which the perforation pattern 62 is formed there, is shown unwound in the circumferential direction from 0 ° to 360 ° corresponding to the unwinding 64.
• individual recesses 66 are offset relative to one another in the circumferential direction.
• Each of the recesses 66 is arranged at a distance 68 to a preceding recess 66.
• the length of each recess 68 is indicated by reference numeral 70. Size, shape, position and number of recesses 66 are based on the respectively required stiffness reduction within the provided with the Lochungsmuster 62 peripheral region of the nozzle clamping element 16.
• the nozzle clamping element 16 has reached its mounting, ie locking position, as shown in FIG. 6.2, then the respective projections 46, which are formed on the inner side of the locking tongues 44 of the nozzle clamping element 16, snap into the locking groove 46. Furthermore, the first spherical shape 50 shown in FIG. 3 formed on the inside of the nozzle tensioning element 16 extends over the circumference of the holding body 14. The diameter of the first spherical shape 50 and that of the holding body 14 are oversized with each other so that they form a first pressure seal of the injector, so that can be dispensed with additional sealing rings.
• the expansion element 16 Shortly before the locking of the locking tongues 44 with their projections 46 in the locking groove 56, the expansion element 16 comes to rest on the nozzle body 22, since the support surface 54 contacts the end face of the nozzle body 22.
• the biasing force for elastic stretching of the expansion region 62 (hole pattern, cf. FIGS. 3 and 4) is applied via the assembly tool 60 to the mounting groove 58.
• the locking tongues 44 After reaching the locking groove 56, the locking tongues 44 elastically spring back into their starting position (see illustration according to FIG. 6.2), latch into the locking groove 56 and lock the injector assembly. Thereafter, the mounting tool 60 can be removed.
• the elastic restoring force of the expansion region 62, 72 of the nozzle tensioning element 16 permanently brings the desired biasing force of the injector components in relation to each other.
• fixing pins for rotationally fixing the components relative to one another can be dispensed with. Also on the key surfaces 26 (see illustration according to Figure 2) on the outer circumference of the nozzle clamping element 16 may be omitted.
• FIG. 6.3 shows how the locking tongues 44 are lifted out of the latching groove 56 on the holding body 14 with the aid of a dismantling tool 74 if the injector dressing is dismantled if necessary.
• the locking tongues 44 formed inside the fixing area 42 are spaced apart by gaps with their respective projections 46 in the locking groove 56.
• the locking groove 56 extends on the outer circumference of the holding body 14 the lower end of the vertically extending locking tongues 44 is the first spherical shape 50, which causes a low pressure seal and which rests on the circumference of the holding body 14.
• the nozzle clamping element 16 also encloses the valve plate 18 and the throttle plate 20 and the nozzle body 22. According to FIG.
• the nozzle body 22 is fixed by the nozzle tensioning element 16 to its bearing surface 54 and is pressed against the underside of the throttle plate 20 with its end face facing away from the combustion chamber end.
• a circumferential surface 78 of the nozzle body 22 is set up with the second spherical formation 52, which is formed opposite the wall of the nozzle clamping element 16.
• Below the mounting groove 58 or the second spherical shape 52 formed on the inside of the nozzle tensioning element 16 extends an area with reduced material thickness 72 or a region in which a perforation pattern 62 extends from the recesses 66 shown in connection with FIGS. 3 and 4.
• the nozzle clamping element 16 In the mounted state 80 of the nozzle clamping element 16 shown in FIG. 7, the latter has an expansion region 72 or 62, which is shown only schematically, which can be formed either in a reduced material thickness or in which the perforation pattern 62 extends from recesses 66.

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• Engineering & Computer Science (AREA)
• Manufacturing & Machinery (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Fuel-Injection Apparatus (AREA)

Applications Claiming Priority (2)

Publications (2)

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ID=38722903

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• 2006
  • 2006-10-20 DE DE102006049532A patent/DE102006049532A1/de not_active Withdrawn
• 2007
  • 2007-08-20 DE DE502007002705T patent/DE502007002705D1/de active Active
  • 2007-08-20 WO PCT/EP2007/058598 patent/WO2008046680A1/fr active Application Filing
  • 2007-08-20 AT AT07788488T patent/ATE455956T1/de active
  • 2007-08-20 CN CN2007800390091A patent/CN101529084B/zh not_active Expired - Fee Related
  • 2007-08-20 EP EP07788488A patent/EP2084393B1/fr not_active Not-in-force

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