EP2188516B1 - Fuel injection device - Google Patents
Fuel injection device Download PDFInfo
- Publication number
- EP2188516B1 EP2188516B1 EP20080783475 EP08783475A EP2188516B1 EP 2188516 B1 EP2188516 B1 EP 2188516B1 EP 20080783475 EP20080783475 EP 20080783475 EP 08783475 A EP08783475 A EP 08783475A EP 2188516 B1 EP2188516 B1 EP 2188516B1
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- EP
- European Patent Office
- Prior art keywords
- housing
- valve
- pressure
- fuel
- filter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000002347 injection Methods 0.000 title claims abstract description 79
- 239000007924 injection Substances 0.000 title claims abstract description 79
- 239000000446 fuel Substances 0.000 title claims abstract description 62
- 238000002485 combustion reaction Methods 0.000 claims abstract description 22
- 238000007789 sealing Methods 0.000 claims description 54
- 210000000078 claw Anatomy 0.000 description 11
- 238000000034 method Methods 0.000 description 7
- 239000011324 bead Substances 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- 230000001419 dependent effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Images
Classifications
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- 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
- F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
- F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
-
- 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
- F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
- F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
- F02M55/025—Common rails
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- 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
- F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
- F02M55/04—Means for damping vibrations or pressure fluctuations in injection pump inlets or outlets
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- 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
- F02M61/165—Filtering elements specially adapted in fuel inlets to injector
-
- 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
- F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
- F02M63/0205—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively for cutting-out pumps or injectors in case of abnormal operation of the engine or the injection apparatus, e.g. over-speed, break-down of fuel pumps or injectors ; for cutting-out pumps for stopping the engine
-
- 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
- F02M2200/40—Fuel-injection apparatus with fuel accumulators, e.g. a fuel injector having an integrated fuel accumulator
Definitions
- the present invention relates to a device for injecting high-pressure fuel into a combustion chamber in an internal combustion engine according to the preamble of patent claim 1.
- the DE 10 2005 012 928 A1 discloses a fuel injector in which each injector is connected via a hydraulic line to a high pressure pump and / or to the injector of another cylinder of the internal combustion engine.
- Another injector is out of the WO 2007/009279 A1 known.
- this high-pressure accumulator injection system for an internal combustion engine each injection valve, a storage chamber and a check valve associated with parallel bypass throttle.
- the injection valves are connected via fuel lines with a high-pressure conveyor. Thanks to the check valve associated with each injection valve with bypass throttle connected in parallel, this high-pressure accumulator injection system can be used to realize stable and reproducible injection processes with a favorable pressure curve in each injection process, even if the discrete storage chambers have an unusually small volume.
- This high-pressure accumulator injection system does not require a bulky common rail.
- Another injector is out of the EP 1 108 886 A known.
- an injection valve is used for each combustion chamber.
- For each injection valve runs through the cylinder head, a bore into which a pressure tube is inserted.
- the housing of the injection valve has laterally on a high-pressure sealing surface on which rests the pressure tube with its integrally formed on this side end Hochtikarnadicht Chemistry.
- the high-pressure return line to each pressure tube is formed by a single common rail, which is fastened by means of screws and claws directly to the cylinder head.
- the claws form a structural unit with the common rail, which can be pressed by means of screws for sealing against the pressure tube.
- a flow restrictor may be provided, which is fastened by means of a thread on the common rail and rests with its end remote from the common rail on the pressure tube.
- the common rail forming the high-pressure feed line forms a common memory for the high-pressure fuel for all injectors. Common Rails are dependent on the number of cylinders of the internal combustion engine, the configuration of the internal combustion engine and their performance and thus specific for each engine type.
- a number of fuel injectors are pressurized via high-pressure lines with high-pressure fuel via a high-pressure accumulator.
- the fuel injectors comprise an annular space into which a connecting piece receiving the high-pressure line opens.
- Associated with the high-pressure feed line is seen in the flow direction before the injector lying an additional volume added, which its distributor side facing a hydraulic decoupling element comprises.
- the JP 2000-205081 A discloses a storage injection system in which fuel is supplied by means of a high-pressure pump under high pressure to a common rail.
- An auxiliary storage is connected between a distributor pipe arranged downstream of the common rail and a nozzle holder.
- the auxiliary storage has a capacity of 3 to 20 times the amount of fuel required for a full load injection.
- the WO 03/076794 A1 discloses an injection system, which has delivery units for conveying fuel from a fuel reservoir for supplying at least one high-pressure line to the cylinders of an internal combustion engine. A number of fuel injectors are supplied via the at least one high-pressure line, wherein it comprises line sections with which the individual fuel injectors are connected to one another.
- the injector bodies comprise an integrated storage space.
- the memory When out of the EP 0 921 303 A known common rail injection system, the memory is connected directly via a claw and a pressure tube to the injector. In the event that larger leaks should occur in the injection system, a flow restrictor may be interposed between the accumulator and the claw.
- the EP 1 353 063 A2 discloses a fuel injection system in which at least one injector connected to a feed system is provided for each cylinder of the internal combustion engine.
- the feed system has an associated fuel pressure accumulator for each cylinder.
- That in the DE 101 14 219 A1 disclosed fuel injection system for supplying the combustion chambers of an internal combustion engine with fuel has a high-pressure pump, which acts on a number of fuel injectors with high pressure fuel.
- the individual fuel injectors each have a storage volume is assigned, which is acted upon directly by a high-pressure supply line from the high-pressure pump.
- a feed connection and a clamp can be arranged on a housing of the injection valve itself or a pressure port.
- a filter preferably retains solid particles in the fuel, which prevents clogging of, in particular, narrow flow cross sections and thus increases the reliability of the injection device. Since the filter also serves as a stop for limiting the opening movement of a valve member of a check valve, a particularly simple, space-saving design is possible.
- Optimum injection processes without a common rail also make possible an injection device in which a pressure port assigned to an injection valve has a storage housing and a pressure pipe fastened thereto, for example via a screw connection.
- the storage enclosure is connected to a high pressure supply line for the fuel and defines a discrete storage chamber for the fuel.
- the discharge nozzle forms a stable, self-supporting, preassembled unit. If the discharge nozzle has a storage housing and a pressure pipe fastened thereto via a screw connection, it is possible in a particularly simple manner to form the pressure chamber.
- the formation of the device with a screw connection allows the particularly simple installation of further components in the discharge nozzle, such as a check valve, a filter, in particular rod filter, and a flow-limiting valve.
- each injection valve itself is provided with a further storage chamber.
- Fig. 1 shows the first three and the last of a number of injection valves 10 of an internal combustion engine 12.
- injectors 10 are well known and intended to intermittently inject under very high pressure fuel into combustion chambers 14 of the internal combustion engine 12.
- the injection valves 10 are inserted into the cylinder head 16 of the internal combustion engine 12 and secured by means of clamping claws 18 and clamping screws 20 on the cylinder head 16.
- Each of the identically trained and also in FIG. 2 Injectors 10 shown has an at least approximately cylindrical valve housing 22, the housing body is provided on its outer side with an outwardly directed high pressure sealing surface 24, which a fuel inlet opening of the valve housing 22 (see also Fig. 3 ) surrounds.
- the high-pressure sealing surface 24 formed on the valve housing 22 tapers conically - seen in the radial direction with respect to the longitudinal axis 28 of the injection valve 10 - from the outside against the inside.
- the generally known injection valves 10 have, on the one hand, nozzle openings for injecting the fuel and, on the other hand, connections for the electrically controlled actuator and optionally the fuel return.
- the actuator controls a hydraulic control device for intermittently injecting the fuel.
- Each injection valve is associated with a discharge nozzle 30 whose longitudinal axis 32 is preferably at least approximately, in this case exactly right angles to the longitudinal axis 28 of the injection valve 10 and this longitudinal axis 28 intersects.
- the discharge nozzles 30 each have a pressure tube 34 and a storage housing 36, which by means of a Screw 38 are firmly connected.
- the discharge ports 30 are, as in the Fig. 1 is indicated, inserted into the cylinder head 16 and by means of further clamping claws 18 'and other clamping screws 20' attached thereto and pressed in the direction against the injectors 10 such that the high-pressure sealing surfaces 24 and high-pressure counter-sealing surfaces 40 sealingly abut each other.
- the further clamping claws 18 'and clamping screws 20' form clamping devices 41 for the discharge nozzle 30.
- the valve housing 22 and storage housing 36 are in the region of the attack of the clamping claws 18 and 18 'formed the same, so that for fixing the injectors 10 and for fixing the discharge nozzle 30 identical trained clamps 18, 18 'and clamping screws 20, 20' can be used.
- the storage housings 36 have, at their free end facing away from the pressure tube 34, a feed connection 42 arranged concentrically to the longitudinal axis 28.
- a high pressure feed line 44 To the supply port 42 of the first injection valve 10th leads a high pressure feed line 44, which in the Fig. 2 is shown.
- This is the other hand connected to a not shown, well-known high-pressure pump, which supplies the injectors 10 under very high pressure, for example, about 1600 to more than 2000 bar standing fuel.
- each storage housing 36 is encompassed by a clamp 48.
- each storage housing 36 has a radial connection passage 50 - see Fig. 3 to 5 -
- the connecting passage 50 of the last of the series of injection valves 10 associated pressure port 30 is sealed by means inserted into the clip 48 locking pin 52.
- all storage enclosures 36 and clamps 48 can be made the same. If the internal combustion engine 12 is an in-line engine, then the respective further high-pressure feed lines 44 'may optionally be of identical design.
- Fig. 3 shows particularly clearly, extends through the substantially circular cylindrical storage housing 36 through a bore 54, which extends several times from the supply port 42 to the pressure tube side end.
- the bore 54 In an end region facing the pressure tube 34, the bore 54 has its largest diameter and is provided there with an internal thread 56.
- pressure tube 34 In the internal thread 56 which is provided in the present end region with an external thread 58 pressure tube 34 is screwed.
- the screw 38 formed by the internal thread 56 and external thread 58 has on the one hand the pressure tube 34 a hexagon socket 60 for the attack of a fork wrench and on the other hand, the storage housing 36 two parallel chamfers 62, which serve the attack of another fork wrench or clamping in a jig (see Fig. 1 and 2 ).
- a filter section 70 Adjoining the storage chamber 68 is a filter section 70, in which the bore is cylindrical with a smaller diameter than in the cylindrical region of the storage chamber 68. Between the cylindrical region of the storage chamber 68 and the filter section 70, the bore 54 has a relatively short conical section in the axial direction.
- a filter 72 and a check valve with throttle passage 74 is arranged, which in conjunction with Fig. 5 to be described in more detail.
- the bore 54 is cylindrical and, as in Fig. 5 shown with a relation to the filter section 70 again smaller diameter. This at least approximately coincides with the inner diameter of the high pressure supply lines 44, 44 'match.
- the bore 54 is conically widening designed to form a connection sealing surface 76 for the high-pressure supply line 44 or further high-pressure supply line 44 '.
- the end of the high pressure supply line 44 and the further high pressure line 44 ' is held in a known manner by means of a union nut 78 on a nozzle-like projection of the storage housing 36.
- connection passage 50 branches off from the bore 54, between the filter section 70 and the supply port 42, in the radial direction, the connection passage 50 from.
- the connecting passage 50 expands in its radially outer half conically around a sealing surface 80 of a Weg effetsan gleiches 82 to form.
- This further has the clamp 48, which surrounds the storage housing 36 and is provided with a threaded neck 84 formed in the radial direction with internal thread 86. With the internal thread 86, a pressure screw 88 cooperates, which is penetrated by the further high-pressure feed line 44 'and the sealing end portion 90 of the further high-pressure feed line 44' presses sealingly against the sealing surface 80.
- the volume of the discrete storage chamber 68 preferably corresponds to four to twenty times the volume of the fuel for engine full load injection. It should also be mentioned at this point that the volume of the storage chamber 68 is greater than, preferably two to three times as large as the storage volume for fuel in the pressure pipe 34.
- the construction of the substantially cylindrical storage housing 36 with the bore 54, which in the one direction widened or narrowed in the other direction, and the formation of the Weg effetsan gleiches 82 with an attachable to the storage housing 36 clamp 48 is extremely simple, allows the formation of the storage chamber 68, the fixed connection with the pressure tube 34 and the installation of other components, in conjunction with the Fig. 5 and 6 to be discribed.
- filter 72 is a rod filter 72 '.
- This is cylindrical in shape and has distributed along its circumference longitudinal grooves 92, 92 ', which alternately open to the storage chamber 68 and the supply port 42 towards the other, however, are closed, and each other, measured in the axial direction, over a substantial part of the length of the rod filter 72 'overlap.
- the outer diameter of the rod filter 72 ' is slightly smaller than in the two axial end portions 94 and 94', which the longitudinal grooves 92 and 92 'close and with which the rod filter 72' in the filter section 72 of the bore 54 in the manner of Press fit is held.
- the check valve 74 is arranged with throttle passage.
- a ring-like, flat valve seat 98 of the check valve 74 is on Storage housing 36 formed by a shoulder 98 'of the bore 54 at the feed port side end of the filter section 70.
- a valve member 100 is a valve member plate 100 ', on which the throttle passage 102 is formed centrally.
- the valve member plate 100 'facing the end of the rod filter 72' forms a stop 106 for the valve member plate 100 'in order to limit its opening movement.
- the seat 112 of this flow restricting valve 110 is formed by a conical configuration of the longitudinal bore 108 at the transition from the cylindrical portion of small diameter in the cylindrical end portion 108 'with a larger diameter.
- punch 114 With the seat 112 acting as a valve member punch 114 cooperates, which is biased by a further coil spring 116 in the direction of the open position of the flow control valve 110.
- the punch 114 In the Fig. 6 the punch 114 is shown in the open position. In the closed position, it engages in the seat 112 and prevents the further inflow of fuel to the associated injection valve 10.
- a sleeve-shaped piston member 118 On the side facing away from the seat 112 of the stamp 114, due to the force of the other coil spring 116, on a sleeve-shaped piston member 118 into which a shutter member 120 is inserted.
- the piston element 118 is arranged with a relatively narrow sliding fit 122 of for example 1/100 mm to 3/100 mm in the pressure tube 34 and slidably mounted in the direction of the longitudinal axis 32.
- the diaphragm element 120 is pressed sealingly in the piston element 118 and has a diaphragm passage 120 'in the axial direction.
- At the piston element 118 and the diaphragm element 120 facing the end of the punch 114 has this crosswise extending radial grooves 124, which allow the passage of fuel from the storage bracket 68 and the aperture passage 120 'to the associated injection valve 10.
- the piston element 118 has, on its end face facing the punch 114, a depression 126, with respect to which the diaphragm element 120 is set back and which serves to center the punch 114 engaged therein. On the side facing away from the punch 114, the piston element 118 has a further depression 126 'in order to form a peripheral stop bead 128 radially outward. This cooperates with a stop disk 130, which on the other hand is supported via a spring washer 132 on a support shoulder 134 of the storage housing 36 at this. On the other hand, the pressure tube 34 abuts against the stop disk 130 with its side on this side and presses it against the spring ring disk 132.
- the pressure pipe 34 has, on its radial outer side, a sealing shoulder 136 against which a sealing ring 138 rests.
- this sealing ring 138 bears against a counter-sealing shoulder 140 of the storage housing 36.
- the cross-section of the orifice passage 120 ' is substantially smaller than any other in the inflow to the injection valve 10 acting passages of the flow path for the fuel in the discharge nozzle 30. This means that during normal injection operations, the piston member 118 together with the punch 114 toward the seat 112th However, even with full-load injections, the punch 114 does not come into contact with the seat 112. After completion of an injection process, the punch 114 moves together with the piston member 118, supported by the force of the other coil spring 116, again in the direction of the stop plate 130th
- the installation of the flow control valve 110, the filter 72 and the check valve 74 with throttle passage in the discharge nozzle 30 allows a simpler and space-saving design of otherwise optionally equipped with these elements injectors 10.
- the discharge nozzle 30 may be formed with only one or none of these elements , In any case, however, it has a storage chamber 68.
- the two-part construction of the housing of the pressure port 30, namely by a pressure tube 34 and a storage housing 36, allows a simple and inexpensive production of the pressure port 30 with integrated storage chamber 68 and optionally other elements - as stated above -.
- a part of the storage chamber 68 can also be formed on the pressure pipe 34.
- connection sealing surface 76 and the thread for the nut 78 are integrally formed on a substantially circular cylindrical connecting part 142, on the other hand inserted into the correspondingly extended in this area running bore 54 of the storage enclosure 36 and by means of a screw 144 at this is attached.
- the connection part 142 can have engagement surfaces, for example a hexagon, between the threads for the union nut 78 and the screw connection 144 for a tool for tightening or loosening the further screw connection 144.
- connection part 142 A portion of the communication passage 50 is formed on the connection part 142, and another portion on the storage case 36. To ensure the connection between these sections, the connecting part 142 has a circumferential groove 146.
- sealing shoulders 148 are integrally formed on the connecting part 142 and the storage housing, which bear sealingly against each other.
- the filter 72 facing end face of the connecting part 142 forms the valve seat 98 for the valve member 100 and the valve member plate 100 '. Between this end face and the circumferential groove 146 there is either a sealing element or a relatively close fit between the connecting part 142 and the storage housing 36 in order to prevent leakage or keep it as small as possible.
- This variant shown has the advantage that the filter 72 or the bar filter 72 'can be introduced into the filter section 70 from the here end of the storage housing 96.
- the storage housing 36 at the transition of the bore 54 from the filter section 70 into the storage chamber 68 have a stop bead 150.
- the filter section 70 may have a diameter which corresponds to the diameter of the bore of the storage chamber 68 and the bore is closed with a suitably adapted in a simple manner connector 142.
- filter 72 check valve 74, flow control valve 110, and connection section with supply port 42 and clamp 48, individually and in combination, also suitable for use directly in injectors 10.
- the illustrated and described embodiment of filter 72, check valve 74, flow control valve 110, and connection section with supply port 42 and clamp 48 also suitable for use directly in injectors 10. In this case, occurs in place of the storage housing 36 and optionally the pressure tube 34, the valve housing 22nd
- Fig. 7 shows a portion of an injector 10 in which the discrete storage chamber 68 is arranged in a known manner in the valve housing 22 of the injection valve 10.
- the housing body 152 of the valve housing 22 does not have a high pressure sealing surface 24 for the pressure tube 34 of a Pressure port 30, but the high-pressure feed line 44 is connected to the supply port 42, which is integrally formed on a connecting piece 150 of the valve housing 22.
- This is eingindet in the housing body 152 and with respect to the terminal sealing surface 76 and the supply port 42 is formed the same as that described above and in Fig. 5 shown connection part 142.
- the filter portion 70 opens into the molded on the housing body 152 storage chamber 68, wherein in the filter section 70, from the storage chamber 68 side facing, the filter 72 is inserted in the form of a rod filter 72 '.
- the longitudinal grooves 92 'open toward the check valve 74 and the supply port 42 are sealed off from the storage chamber 68 by the axial end region 94'.
- the rod filter 72 'in the storage chamber 68 facing the axial end portion 94' in a direction radially outwardly open circumferential groove 154 which via crosswise extending radial bores 156 and a sack-like, to Storage chamber 68 toward open axial bore 158 is fluidly connected to the storage chamber 68.
- the longitudinal grooves 92 open into the circumferential groove 154 and end there, the longitudinal grooves 92 'are separated therefrom.
- the circumferential groove 154 is radially outwardly covered by the connecting piece 150.
- the end region of the rod filter 72 'protruding in the direction of the storage chamber 68 via the connecting piece 150, forming a flange 160, has a larger diameter than the part of the rod filter 72' arranged in the filter section 70.
- the flange 160 rests with its surface facing the connection piece 150 against a front-side counter-shoulder 162 of the connecting piece 150 and is encompassed by a sealing bead 164 of the connecting piece 150 projecting in the axial direction with respect thereto.
- a peripheral shoulder 166 forming the outer diameter is integrally formed on the transparent cross section of the storage chamber 68 on the flange 160.
- the shoulder 166 and the free end of the sealing bead 164 abut against a sealing ring 168, which on the other hand bears against a sealing shoulder 170 of the housing body 152 and is supported radially outward by the housing body 152 and radially inward by the flange 160. With the free end portion of the flange 160 engages this in the storage chamber 68 forming portion of the axial bore in the housing body 152 a.
- the preferably rectangular cross-section sealing ring 168 may be made of a soft metal and is compressed when tightening the screw 172 between the connecting piece 150 and the housing body 152, in order to very high pressures to ensure a reliable seal.
- valve seat 98 for the valve member plate 100 'designed as a valve member 100 of the check valve 74 is integrally formed on the connecting piece 150.
- the connecting piece 150 has a circumferential, axial undercut 174 so that a ring-like, axially exposed bead is formed with the annular valve seat 98.
- the valve member plate 100 'with the centrally arranged throttle passage 102 is held by the coil spring 104technischdrteilbar on the valve seat 98 in abutment, wherein the coil spring 104 the other end on the rod filter 72' is supported. It engages in a world-side centering recess 176 of the rod filter 72 ', which has a relative to the axial end portion 94 in the direction of the valve member plate 100' projecting, sleeve-shaped projection whose free end forms the stop 106 to limit the opening travel of the valve member plate 100 '.
- the clamping claw 18 engages with its pressure shoulder 64 on the connecting piece 150 side end face of the housing body 152, which forms the counter-shoulder 66.
- the injection valve 10 can otherwise be configured as in the WO 2007/009279 A disclosed. Further, it is also possible the connection piece 150 for feeding a further injection valve 10 according Fig. 4 train. Moreover, it should be mentioned that the discharge nozzle 30 analog Fig. 7 can be trained. When in the Fig. 7 In the embodiment shown, the rod filter 72 'is held between the connecting piece 150 and the sealing ring 168. However, it is also possible, as described above, to fix the rod filter 72 'by means of a press fit in the connecting piece 150.
- the discrete storage chamber 68 is also formed on the housing body 152 of the injection valve 10.
- the extending in the direction of the longitudinal axis 28, the storage chamber 68 forming bore 54 is sealed at the connection-side end of the housing body 152 by means of a threaded in this sealing plug 178 of the valve housing 22.
- the end face of the sealing plug 78 facing the storage chamber 68 forms the valve seat 98 for the valve member 100 'of the check valve 74.
- the throttle passage 102 extends centrally through the valve member plate 100'.
- the valve member plate 100 'facing end face of the rod filter 72' forms the stop 106 to limit the opening movement of the valve member plate 100 '.
- the bar filter 72 ' On the side facing away from the check valve 74, the bar filter 72 'is supported on a circumferential support shoulder 182 in the axial direction.
- the rod filter 72 ' according to Fig. 8 , is in principle the same education as that according to the Fig. 3 and 5 However, he is in the direction of Seen longitudinal axis 28 may be formed shorter, because it has approximately the same diameter as the storage chamber 68. Thus, it can have more longitudinal grooves 92, 92 'as the embodiment according to the Fig. 3 and 5 to form the same flow area in the narrow filter gaps between the rod filter 72 'and the housing body 152.
- the rod filter 72 ' is preferably held in the housing body 152 by means of a press fit.
- the sealing plug 178 is provided with a fuel channel 184 which is connected on the one hand to the high-pressure feed line 44 and on the other hand to the further high-pressure feed line 44 'and leads to the check valve 74. It is formed by a blind hole embraced by the annular valve seat 98, a radial bore 190 intersecting with it, and a circumferential connecting groove 192 which is open in the radial direction with respect to the longitudinal axis 28 and opens into the bottom region of the radial bore 190.
- the sealing plug 178 between the connecting groove 192 and its front side facing the storage chamber 68 is held in a relatively tight fit in the housing body 152 in order to prevent or at least minimize leakage from the fuel from the connecting groove 192 to the rod filter 72 ' , Toward the free end of the housing body 152, a seal 194 prevents the escape of fuel to the environment.
- the compound groove 192 extends through the housing body 152 through the connecting passage 50, which on both sides, in the radial direction outwardly, flared to form the sealing surfaces 80, to which the corresponding sealing surfaces 80 of High-pressure supply line 44 and further high-pressure supply line 44 'come to the plant.
- the storage chamber 68 is integrally formed on the housing body 152 of the valve housing 22, from which, in the direction towards the nozzle openings facing away from the end, a connecting hole 196 parallel to the longitudinal axis 28 and with respect to this laterally offset in the housing body 152.
- Denoted at 198 is the further communication bore leading from the storage chamber 68 to the nozzle openings.
- the connecting hole 196 is either executed like a blind hole or closed by a plug.
- the bore 54 is designed to taper in a stepwise manner, wherein it widens conically from its narrowest part, which forms an inflow section 200, in the direction towards the outside, in order to form a high pressure sealing surface 24.
- a pressure pipe socket 202 with its Hochschermendicht Structure 40 sealingly is provided at this.
- the pressure pipe stub 202 is generally known construction and has no discrete storage chamber 68 in the present case. In principle, however, it can be provided with such a storage chamber and constructed as described above.
- the bore 54 is tightly closed by means of a sealing plug 178 threaded into the housing body 152.
- a sealing ring 168 acts between the sealing plug 178 and the housing body 152.
- the sealing plug 178 projecting and integrally formed with this plug shaft 204 of the rod filter 72 ' is formed, which is otherwise exactly the same as described above and, for example in the Fig. 3 and 5 shown.
- the longitudinal grooves 92 in the direction of the check valve 74 and thus to the fuel-supplying pressure pipe stub 202 open and on the other hand closed by the axial end portion 94, which seen in the inflow direction of the fuel, sealingly against the housing body 152 upstream of the flow connection to the connecting hole 196. Accordingly, the through the axial end portion 94 extending through longitudinal grooves 92 ' upstream through the axial end portion 94 'closed.
- the plug stem 204 is provided with a reduced cross section to produce an adequate flow area to the communication bore 196.
- the inflow section 200 facing the end face of the rod filter 72 ' forms the stop 106 for the valve member plate 100' formed valve member 100 of the check valve 74. It has on its side facing the rod filter 72 on the centering 180, which is encompassed by this side end of the coil spring 104 the latter engaging in the centering recess 176 of the rod filter 72 'and resting against the bottom thereof.
- the coil spring 104 By the coil spring 104, the valve member plate 100 'is held back against the valve seat 98 in abutment, which is formed by a step-like constriction of the bore 54.
- the injection valve 10 corresponding to the WO 2007/009279 A be educated.
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Abstract
Description
Die vorliegende Erfindung betrifft eine Vorrichtung zum Einspritzen von unter Hochdruck stehendem Brennstoff in einen Brennraum in einer Verbrennungskraftmaschine gemäss dem Oberbegriff des Patentanspruchs 1.The present invention relates to a device for injecting high-pressure fuel into a combustion chamber in an internal combustion engine according to the preamble of
Die
Aus den Druckschriften
Eine weitere Einspritzvorrichtung ist aus der
Eine weitere Einspritzvorrichtung ist aus der
Um die damit verbundenen Nachteile zu beheben wird in der
Bei einem aus der
Die
Auch die aus der
Die
Beim aus der
Die
Das in der
Ausgehend von diesem Stand der Technik ist es eine Aufgabe der vorliegenden Erfindung, eine gattungsgemässe Vorrichtung zu schaffen, welche auf einfache Art und Weise die Versorgung eines weiteren Einspritzventils mit Brennstoff ermöglicht.Based on this prior art, it is an object of the present invention to provide a generic device, which allows in a simple manner, the supply of another injector with fuel.
Diese Aufgabe wird mit einer Vorrichtung, welche die Merkmale des Patentanspruchs 1 aufweist, gelöst.This object is achieved with a device having the features of
Ein Zuleitungsanschluss und eine Schelle können an einem Gehäuse des Einspritzventils selber oder eines Druckstutzens angeordnet sein.A feed connection and a clamp can be arranged on a housing of the injection valve itself or a pressure port.
Bevorzugt hölt ein Filter Feststoffpartikel im Brennstoff zurück, was ein Verstopfen von, insebesondere engen Strömungsquerschnitten verhindert und somit die Zuverlässigkeit der Einspritzvorrichtung erhöht. Da der Filter auch als Anschlag für die Begrenzung der Öffnungsbewegung eines Ventilgliedes eines Rückschlagventils dient, ist ein besonders einfacher, platzsparender Aufbau möglich.A filter preferably retains solid particles in the fuel, which prevents clogging of, in particular, narrow flow cross sections and thus increases the reliability of the injection device. Since the filter also serves as a stop for limiting the opening movement of a valve member of a check valve, a particularly simple, space-saving design is possible.
Bevorzugte Ausführungsformen der erfindungsgemässen Vorrichtung sind in den abhängigen Ansprüchen 2 bis 12 angeben.Preferred embodiments of the device according to the invention are indicated in the dependent claims 2 to 12.
Optimale Einspritzvorgänge ohne Common Rail ermöglicht auch eine Einspritzvorrichtung, bei welcher ein einem Einspritzventil zugeordneter Druckstutzen ein Speichergehäuse und ein beispielsweise über eine Schraubenverbindung an diesem befestigtes Druckrohr aufweist. Das Speichergehäuse ist an eine Hochdruckzuleitung für den Brennstoff angeschlossen und begrenzt eine diskrete Speicherkammer für den Brennstoff.Optimum injection processes without a common rail also make possible an injection device in which a pressure port assigned to an injection valve has a storage housing and a pressure pipe fastened thereto, for example via a screw connection. The storage enclosure is connected to a high pressure supply line for the fuel and defines a discrete storage chamber for the fuel.
Der Druckstutzen bildet eine stabile, freitragende, vormontierbare Baueinheit. Falls der Druckstutzen ein Speichergehäuse und ein an diesem über eine Schraubenverbindung befestigtes Druckrohr aufweist, ist es auf besonders einfache Art und Weise möglich, die Druckkammer auszubilden.The discharge nozzle forms a stable, self-supporting, preassembled unit. If the discharge nozzle has a storage housing and a pressure pipe fastened thereto via a screw connection, it is possible in a particularly simple manner to form the pressure chamber.
Überdies ermöglicht die Ausbildung der Vorrichtung mit einer Schraubenverbindung den besonders einfachen Einbau von weiteren Komponenten in den Druckstutzen, wie einem Rückschlagventil, einem Filter, insbesondere Stabfilter, und einem Durchflussbegrenzungsventil.Moreover, the formation of the device with a screw connection allows the particularly simple installation of further components in the discharge nozzle, such as a check valve, a filter, in particular rod filter, and a flow-limiting valve.
Mit der diskreten Speicherkammer im Druckstutzen werden optimale Einspritzvorgänge ermöglicht, selbst wenn die Hochdruckzuleitung ein geringes Speichervolumen aufweist. Es ist möglich, dass jedes Einspritzventil selber mit einer weiteren Speicherkammer versehen ist.With the discrete storage chamber in the discharge nozzle optimal injection processes are possible, even if the high pressure supply line has a small storage volume. It is possible that each injection valve itself is provided with a further storage chamber.
Bezüglich der Dimensionierung der Speicherkammer und der Funktionsweise der Speicherkammer in Zusammenschau mit den den übrigen Einspritzventilen der Vorrichtung zugeordneten Speicherkammern der betreffenden Druckstutzen wird auf die
Die vorliegende Erfindung wird anhand in der Zeichnung dargesellten Ausführungsbeispielen näher beschrieben. Es zeigen rein schematisch:
- Fig. 1
- in perspektivischer Darstellung vier Einspritzventile einer Reihe von in einem Zylinderkopf einer Verbrennungskraftmaschine angeordnete Einspritzventilen, den Einspritzventilen zugeordnete Druckstutzen und eine Hochdruckzuleitung für die Speisung der Einspritzventile mit Brennstoff;
- Fig. 2
- in Ansicht zwei der in der
Fig. 1 gezeigten Einspritzventile mit den diesen zugeordneten Druckstutzen und der Hochdruckzuleitung; - Fig. 3
- einen Längsschnitt durch einen, ein Speichergehäuse und ein Druckrohr aufweisenden Druckstutzen gemäss den
Fig. 1 und2 sowie eine Spannpratze; - Fig. 4
- einen Schnitt entlang der Linie C-C der
Fig. 3 durch das Speichergehäuse und eine dieses umgreifende Schelle; - Fig. 5
- im Längsschnitt einen Teil des Speichergehäuses mit einem darin angeordneten Rückschlagventil und Stabfilter;
- Fig. 6
- ebenfalls im Längsschnitt einen Teil des Speichergehäuses und des Druckrohres bei der Verschraubung mit einem darin angeordneten Durchflussbegrenzungsventil;
- Fig. 7
- im Längsschnitt einen Teil eines Einspritzventilgehäuses eines Einspritzventils mit einem Anschlussstutzen, in welchem das Rückschlagventil und der Stabfilter angeordnet sind;
- Fig. 8
- ebenfalls im Längsschnitt einen Teil einer weiteren Ausführungsform des Einspritzventilgehäuses (das nicht von einer Schelle gemäß
Anspruch 1 umgriffen ist) mit einem Dichtstopfen, an welchem der Ventilsitz des Rückschlagventils ausgebildet ist, und einem Stabfilter; und - Fig. 9
- einen Querschnitt durch einen Gehäusekörper eines Einspritzventils (das nicht von einer Schelle gemäß
Anspruch 1 umgriffen ist), wobei am Dichtstopfen der Stabfilter angeformt ist.
- Fig. 1
- four injection valves of a series of arranged in a cylinder head of an internal combustion engine injectors, the injection valves associated pressure port and a high pressure feed line for feeding the injectors with fuel in a perspective view;
- Fig. 2
- in view of two in the
Fig. 1 shown injectors with the associated pressure port and the high pressure supply line; - Fig. 3
- a longitudinal section through a, a storage housing and a pressure tube having discharge nozzle according to the
Fig. 1 and2 as well as a clamping claw; - Fig. 4
- a section along the line CC the
Fig. 3 through the storage enclosure and an encompassing this clamp; - Fig. 5
- in longitudinal section a part of the storage housing with a check valve and rod filter arranged therein;
- Fig. 6
- also in longitudinal section a part of the storage housing and the pressure tube in the screw connection with a flow-limiting valve arranged therein;
- Fig. 7
- a longitudinal section of a part of an injection valve housing of an injection valve with a connecting piece, in which the check valve and the rod filter are arranged;
- Fig. 8
- also in longitudinal section a part of another embodiment of the injection valve housing (which is not encompassed by a clamp according to claim 1) with a sealing plug, on which the valve seat of the check valve is formed, and a rod filter; and
- Fig. 9
- a cross section through a housing body of an injection valve (which is not encompassed by a clamp according to claim 1), wherein on the sealing plug of the rod filter is formed.
Jedes der identisch ausgebildeten und auch in
In Richtung der Längsachse 28 gesehen, weisen die allgemein bekannten Einspritzventile 10 einerseits Düsenöffnungen zum Einspritzen des Brennstoffs und andererseits Anschlüsse für den elektrisch gesteuerten Aktuator und gegebenenfalls den Brennstoffrücklauf auf. Der Aktuator steuert eine hydraulische Steuereinrichtung zum intermittierenden Einspritzen des Brennstoffs.Viewed in the direction of the
Jedem Einspritzventil ist ein Druckstutzen 30 zugeordnet dessen Längsachse 32 vorzugsweise wenigstens annähernd, im vorliegenden Fall genau rechtwinklig zur Längsachse 28 des Einspritzventils 10 verläuft und diese Längsachse 28 kreuzt. Die Druckstutzen 30 weisen je ein Druckrohr 34 und ein Speichergehäuse 36 auf, welche mittels einer Schraubverbindung 38 fest miteinander verbunden sind.Each injection valve is associated with a
Am Druckrohr 34 ist, an dessen dem Speichergehäuse 36 abgewandten freien Endbereich, eine vorzugsweise konische beziehungsweise kugelförmige Hochdruckgegendichtfläche 40 ausgebildet. Das Druckrohr liegt mit seiner Hochdruckgegendichtfläche 40 an der Hochdruckdichtfläche 24 des Ventilgehäuses 22 an. Ist die Hochdruckgegendichtfläche 40 zum Ende des Druckrohrs 34 hin konisch verjüngend beziehungsweise am Ende kugelförmig ausgebildet, greift das Druckrohr 34 in das Ventilgehäuse 22 ein, was zu einer automatischen Zentrierung des Druckrohrs 34 betreffend des Einspritzventils 10 führt.At the
Die Druckstutzen 30 sind, wie dies in der
Die Speichergehäuse 36 weisen an ihrem freien, dem Druckrohr 34 abgewandten Ende, einen zur Längsachse 28 konzentrische angeordneten Zuleitungsanschluss 42 auf. Zum Zuleitungsanschluss 42 des ersten Einspritzventils 10 führt eine Hochdruckzuleitung 44, welche in der
Anschliessend an den Zuleitungsanschluss 42 ist jedes Speichergehäuse 36 von einer Schelle 48 umgriffen. Im Bereich der Schelle 48 weist jedes Speichergehäuse 36 einen radialen Verbindungsdurchlass 50 auf - siehe
Wie dies aus der
Vom Filterabschnitt 70 zum Zuleitungsanschluss 42 verläuft die Bohrung 54 zylinderförmig und, wie auch in
Am diesseitigen Ende ist die Bohrung 54 konisch erweiternd ausgebildet, um eine Anschlussdichtfläche 76 für die Hochdruckzuleitung 44 beziehungsweise weitere Hochdruckzuleitung 44' zu bilden. Das Ende der Hochdruckzuleitung 44 beziehungsweise des weiteren Hochdruckleitung 44' ist in bekannter Art und Weise mittels einer Überwurfmutter 78 an einem stutzenartigen Vorsprung des Speichergehäuses 36 gehalten.At this side end, the
Wie dies insbesondere aus einer Zusammenschau der
Das Volumen der diskreten Speicherkammer 68 entspricht vorzugsweise dem vier- bis zwanzigfachen Volumen des Brennstoffs für eine Motor-Volllasteinspritzung. An dieser Stelle sei auch erwähnt, dass das Volumen der Speicherkammer 68 grösser als, vorzugsweise zwei- bis dreimal so gross ist wie das Speichervolumen für Brennstoff im Druckrohr 34.The volume of the
Die Konstruktion des im wesentlichen zylinderförmigen Speichergehäuses 36 mit der Bohrung 54, welche sich in der einen Richtung erweitert beziehungsweise in der anderen Richtung verengt, und die Ausbildung des Wegleitungsanschlusses 82 mit einer auf das Speichergehäuse 36 aufsetzbaren Schelle 48 ist äusserst einfach, erlaubt die Ausbildung der Speicherkammer 68, die feste Verbindung mit dem Druckrohr 34 sowie den Einbau von weiteren Komponenten, die in Zusammenschau mit den
Wie dies insbesondere der
Weiter ist im Filterabschnitt 70 auf der der Speicherkammer 68 abgewandten Seite das Rückschlagventil 74 mit Drosseldurchlass angeordnet. Ein ringartiger, ebener Ventilsitz 98 des Rückschlagsventils 74 ist am Speichergehäuse 36 durch eine Schulter 98' der Bohrung 54 am zuleitungsanschlussseitigen Ende des Filterabschnitts 70 ausgebildet. Als Ventilglied 100 dient ein Ventilgliedplättchen 100', an welchem zentral der Drosseldurchlass 102 ausgebildet ist. Das Ventilgliedplättchen 100' ist mittels einer Schraubenfeder 104, welche sich andernends am Stabfilter 72' abstützt, in zurückdrängbarer Anlage am Ventilsitz 98 gehalten. Das dem Ventilgliedplättchen 100' zugewandte Ende des Stabfilters 72' bildet einen Anschlag 106 für das Ventilgliedplättchen 100', um dessen Öffnungsbewegung zu begrenzen. Die Aufgabe und Funktionsweise des Rückschlagventils 74 mit Drosseldurchlass 102, im Zusammenhang mit einer allenfalls kleinen diskreten Speicherkammer 68, ist in der
Mit gestrichelten Linien ist in
Die in axialer Richtung durch das Druckrohr 34 hindurch gehende Längsbohrung 108 - siehe insbesondere
Auf der dem Sitz 112 abgewandten Seite liegt der Stempel 114, in Folge der Kraft der weiteren Schraubenfeder 116, an einem hülsenförmigen Kolbenelement 118 an, in welches ein Blendenelement 120 eingesetzt ist. Das Kolbenelement 118 ist mit einer relativ engen Gleitpassung 122 von beispielsweise 1/100 mm bis 3/100 mm im Druckrohr 34 angeordnet und in Richtung der Längsachse 32 verschiebbar gelagert. Das Blendenelement 120 ist im Kolbenelement 118 dichtend eingepresst und weist in axialer Richtung einen Blendendurchlass 120' auf. Am dem Kolbenelement 118 und Blendenelement 120 zugewandten Ende des Stempels 114 weist dieser kreuzweise verlaufende Radialnuten 124 auf, welche das Durchströmen vom Brennstoff von der Speicherklammer 68 und dem Blendendurchlass 120' zum zugeordneten Einspritzventil 10 erlauben.On the side facing away from the seat 112 of the stamp 114, due to the force of the other coil spring 116, on a sleeve-shaped piston member 118 into which a
Das Kolbenelement 118 weist auf seiner dem Stempel 114 zugewandten Stirnseite eine Vertiefung 126 auf, bezüglich welcher das Blendenelement 120 zurückversetzt angeordnet ist und welches der Zentrierung des darin mit Spiel eingreifenden Stempels 114 dient. Auf der dem Stempel 114 abgewandten Seite weist das Kolbenelement 118 eine weitere Vertiefung 126' auf, um radial aussen einen umlaufenden Anschlagwulst 128 zu bilden. Dieser wirkt mit einer Anschlagsscheibe 130 zusammen, welche andererseits über eine Federringscheibe 132 an einer Stützschulter 134 des Speichergehäuses 36 an diesem abgestützt ist. Andererseits liegt das Druckrohr 34 mit seiner diesseitigen Stirnseite an der Anschlagscheibe 130 an und drückt diese gegen die Federringscheibe 132. Gegenüber dieser Stirnseite zurückversetzt weist das Druckrohr 34, auf seiner radialen Aussenseite, eine Dichtschulter 136 auf, an welcher ein Dichtring 138, anliegt. Andererseits liegt dieser Dichtring 138, an einer Gegendichtschulter 140 des Speichergehäuses 36 an. Beim Anziehen der Schraubverbindung 38 zwischen dem Speichergehäuse 36 und dem Druckrohr 34 wird der Dichtring 138 dichtend angepresst.The piston element 118 has, on its end face facing the punch 114, a
Der Querschnitt des Blendendurchlasses 120' ist wesentlich kleiner als alle übrigen in Zuströmrichtung zum Einspritzventil 10 wirkenden Durchlässe des Strömungsweges für den Brennstoff im Druckstutzen 30. Dies führt dazu, dass während normalen Einspritzvorgängen das Kolbenelement 118 zusammen mit dem Stempel 114 sich in Richtung zum Sitz 112 hin bewegt, wobei jedoch, selbst bei Volllasteinspritzungen, der Stempel 114 nicht mit dem Sitz 112 in Berührung gelangt. Nach der Beendigung eines Einspritzvorgangs bewegt sich der Stempel 114 zusammen mit dem Kolbenelement 118, unterstützt durch die Kraft der weiteren Schraubenfeder 116, wieder in Richtung zur Anschlagscheibe 130.The cross-section of the orifice passage 120 'is substantially smaller than any other in the inflow to the
Hält jedoch, in Folge eines Defekts stromabwärts des Durchflussbegrenzungsventils 110, der Druckabfall über dem Kolbenelement 118 und dem Blendenelement 120 für längere Zeit als bei einer Volllasteinspritzung an, bewegt sich der Stempel 114 in die Schliessstellung und verhindert das Zufliessen von weiterem Brennstoff zum betreffenden Einspritzventil 10.However, due to a defect downstream of the
Der Einbau des Durchflussbegrenzungsventils 110, des Filters 72 und des Rückschlagventils 74 mit Drosseldurchlass in den Druckstutzen 30 erlaubt einen einfacheren und raumsparenden Aufbau der ansonsten gegebenenfalls mit diesen Elementen ausgestatteten Einspritzventile 10. Selbstverständlich kann der Druckstutzen 30 auch mit nur einzelnen oder keinem dieser Elemente ausgebildet sein. Auf jeden Fall weist er jedoch eine Speicherkammer 68 auf.The installation of the
Der zweiteilige Aufbau des Gehäuses des Druckstutzens 30, nämlich durch ein Druckrohr 34 und ein Speichergehäuse 36, lässt eine einfache und günstige Herstellung des Druckstutzens 30 mit integrierter Speicherkammer 68 und gegebenenfalls weiteren Elementen - wie oben dargelegt - zu. Der Vollständigkeit halber sei erwähnt, dass ein Teil der Speicherkammer 68 auch am Druckrohr 34 ausgebildet sein kann.The two-part construction of the housing of the
Es ist auch möglich, das Blendenelement 120 integral am Kolbenelement 118 auszubilden. Die Trennung von Kolbenelement 118 und Stempel 114 ist in der Fertigung dahingehend von Vorteil, dass die Rundlauftoleranzen zwischen einerseits der aussenliegenden Mantelfläche des Kolbenelements 118 und der Dichtfläche des Stempels 114 und andererseits der innenliegenden Mantelfläche des Druckrohrs 34 im Bereich der Gleitpassung 122 und dem Sitz 112 kaum Beachtung geschenkt werden muss.It is also possible to integrally form the
Bei der in
Ein Abschnitt des Verbindungsdurchlasses 50 ist am Anschlussteil 142 und ein weiterer Abschnitt am Speichergehäuse 36 ausgebildet. Um die Verbindung zwischen diesen Abschnitten sicherzustellen, weist das Anschlussteil 142 eine Umfangsnut 146 auf.A portion of the
Zwischen dieser Umfangsnut 146 und der weiten Schraubverbindung 144 sind am Anschlussteil 142 und am Speichergehäuse 36 Dichtschultern 148 angeformt, die dichtend aneinander anliegen.Between this circumferential groove 146 and the
Die dem Filter 72 zugewandte Stirnseite des Anschlussteils 142 bildet den Ventilsitz 98 für das Ventilglied 100 beziehungsweise das Ventilgliedplättchen 100'. Zwischen dieser Stirnseite und der Umfangsnut 146 ist zwischen dem Anschlussteil 142 und dem Speichergehäuse 36 entweder ein Dichtelement oder eine relativ enge Passung vorhanden, um eine Leckage zu verhindern beziehungsweise möglichst klein zu halten.The
Diese gezeigte Variante hat den Vorteil, dass der Filter 72 beziehungsweise der Stabfilter 72' vom diesseitigen Ende des Speichergehäuses 96 her in den Filterabschnitt 70 eingebracht werden kann. Zur Positionierung des Filters 72 beziehungsweise des Stabfilters 72' kann das Speichergehäuse 36 beim Übergang der Bohrung 54 vom Filterabschnitt 70 in die Speicherkammer 68 einen Anschlagwulst 150 aufweisen.This variant shown has the advantage that the
Es ist auch denkbar, das Speichergehäuse 36 und das Druckrohr 34 zusammen einstückig auszubilden. In diesem Fall kann der Filterabschnitt 70 einen Durchmesser aufweissen, welcher dem Durchmesser der Bohrung der Speicherkammer 68 entspricht und wird die Bohrung mit einem entsprechend auf einfach Art und Weise angepassten Anschlussteil 142 verschlossen.It is also conceivable to form the
Weiter ist die gezeigte und beschriebene Ausbildungsform von Filter 72, Rückschlagbventil 74, Durchflussbegrenzungsventil 110, und Anschlusspartie mit Zuleitungsanschluss 42 und Schelle 48, einzeln und in Kombination, auch für den Einsatz direkt in Einspritzventilen 10 geeignet. Dabei tritt an Stelle des Speichergehäuses 36 und gegebenenfalls Druckohrs 34 das Ventilgehäuse 22.Further, the illustrated and described embodiment of
Durch den Anschlussstutzen 150 hindurch verläuft, in Richtung der Längsachse 28, die Bohrung 54 mit dem Filterabschnitt 70 und dem daran anschliessenden, im Querschnitt kleineren, zur Anschlussdichtfläche 76 führenden Bohrungsabschnitt 54. Der Filterabschnitt 70 mündet in die am Gehäusekörper 152 angeförmte Speicherkammer 68, wobei in den Filterabschnitt 70, von der der Speicherkammer 68 zugewandten Seite her, der Filter 72 in Form eines Stabfilters 72' eingesetzt ist. Dieser weist, wie weiter oben bereits beschrieben, die Längsnuten 92, 92' auf, wobei die Längsnuten 92 mittels des axialen Endbereichs 94, welcher am Anschlussstutzen 150 dichtend anliegt, in Richtung zum Rückschlagventil 74 und zum Zuleitungsanschluss 42 hin mit einer engen Passung praktisch abgedichtet sind. Entsprechend sind die in Richtung zum Rückschlagventil 74 und zum Zuleitungsanschluss 42 hin offenen Längsnuten 92' durch den axialen Endbereich 94' in Richtung zur Speicherkammer 68 hin abgedichtet. Wie dies bei den weiter oben beschriebenen Ausführungsformen auch der Fall ist. In der Ausführungsform gemäss
Der in Richtung zur Speicherkammer 68 hin über den Anschlussstutzen 150 vorstehende Endbereich des Stabfilters 72' ist, einen Flansch 160 bildend, im Durchmesser grösser ausgebildet als der im Filterabschnitt 70 angeordnete Teil des Stabfilters 72'. Der Flansch 160 liegt mit seiner dem Anschlussstutzen 150 zugewandten Fläche an einer stirnseitigen Gegenschulter 162 des Anschlussstutzens 150 an und ist von einem gegenüber dieser in axialer Richtung vorstehenden Dichtwulst 164 des Anschlussstutzens 150 umgriffen. Auf der Höhe des freien Endes des Dichtwulsts 164 ist am Flansch 160 eine umlaufende Schulter 166 bildende Verjüngung des Aussendurchmessers auf den lichten Querschnitt der Speicherkammer 68 angeformt. Die Schulter 166 und das freie Ende des Dichtwulsts 164 liegen an einem Dichtungsring 168 an, welcher andererseits an einer Dichtschulter 170 des Gehäusekörpers 152 anliegt und radial aussen vom Gehäusekörper 152 und radial innen vom Flansch 160 gestützt ist. Mit dem freien Endabschnittt des Flansches 160 greift dieser in den die Speicherkammer 68 bildenden Abschnitt der axialen Bohrung im Gehäusekörper 152 ein. Der vorzugsweise einen rechteckigen Querschnitt aufweisende Dichtungsring 168 kann aus einem weichen Metall bestehen und wird beim Festziehen der Schraubverbindung 172 zwischen dem Anschlussstutzen 150 und dem Gehäusekörper 152 komprimiert, um auch bei den sehr hohen Drücken eine zuverlässige Abdichtung zu gewährleisten.The end region of the rod filter 72 'protruding in the direction of the
Der Ventilsitz 98 für das als Ventilgliedplättchen 100' ausgebildete Ventilglied 100 des Rückschlagventils 74 ist am Anschlussstutzen 150 angeformt. Beim Übergang vom Filterabschnitt 70 in den zur Anschlussdichtfläche 76 führenden Abschnitt der Bohrung 54 weist der Anschlussstutzen 150 einen umlaufenden, axialen Hinterschnitt 174 auf sodass ein ringartiger, in axialer Richtung exponierter Wulst mit dem ringförmiger Ventilsitz 98 gebildet ist.The
Das Ventilgliedplättchen 100' mit dem mittig angeordneten Drosseldurchlass 102 ist mittels der Schraubenfeder 104 zurückdrängbar am Ventilsitz 98 in Anlage gehalten, wobei sich die Schraubenfeder 104 andernends am Stabfilter 72' abstützt. Sie greift in eine diesseitige Zentrierausnehmung 176 des Stabfilters 72' ein, welcher einen gegenüber dem axialen Endbereich 94 in Richtung zum Ventilgliedplättchen 100' hin vorstehenden, hülsenförmigen Vorsprung aufweist, dessen freies Ende den Anschlag 106 zur Begrenzung des Öffnungsweges des Ventilgliedplättchens 100' bildet.The valve member plate 100 'with the centrally arranged
Die Spannpratze 18 greift mit ihrer Druckschulter 64 an der Anschlussstutzen 150 seitigen Stirnseite des Gehäusekörpers 152 an, welche die Gegenschulter 66 bildet.The clamping
Der Vollständigkeit halber sei erwähnt, dass das Einspritzventil 10 im Übrigen so ausgebildet sein kann, wie in der
Bei dem in
Auf der dem Rückschlagventil 74 abgewandten Seite ist der Stabfilter 72' an einer umlaufenden Stützschulter 182 in axialer Richtung abgestützt. Der Stabfilter 72', gemäss
Der Dichtstopfen 178 ist mit einem Brennstoffkanal 184 versehen, welcher einerseits mit der Hochdruckzuleitung 44 und andererseits mit der weiteren Hochdruckzuleitung 44' verbunden ist sowie zum Rückschlagventil 74 führt. Er ist durch eine vom ringförmigen Ventilsitz 98 umgriffenen Sacklochbohrung 186, einer sich mit dieser kreuzenden Radialbohrung 190, sowie einer bezüglich der Längsachse 28 in radialer Richtung gegen aussen offenen, umlaufenden Verbindungsnut 192 gebildet, in deren Bodenbereich die Radialbohrung 190 mündet. Der Vollständigkeit halber sei erwähnt, dass der Dichtstopfen 178 zwischen der Verbindungsnut 192 und seinem der Speicherkammer 68 zugewandten Stirnseite in relativ enger Passung im Gehäusekörper 152 gehalten ist, um Leckage vom Brennstoff von der Verbindungsnut 192 zum Stabfilter 72' zu unterbinden oder wenigstens minimal zu halten. In Richtung zum freien Ende des Gehäusekörpers 152 hin verhindert eine Dichtung 194 den Austritt von Brennstoff an die Umgebung.The sealing
Bei der Verbundungsnut 192 verläuft durch den Gehäusekörper 152 hindurch der Verbindungsdurchlass 50, welcher sich beidseitig, in radialer Richtung gegen aussen, zur Bildung der Dichtflächen 80 konisch erweitert, an welchen die entsprechenden Dichtflächen 80 der Hochdruckzuleitung 44 bzw. weiteren Hochdruckzuleitung 44' zur Anlage gelangen. Die Dichtungsendabschnitte 90 dieser Hochdruckzuleitungen 44, 44' sind mittels in den Gehäusekörper 152 eingewindeten Druckschrauben 88 in bekannter Art und Weise an den Dichtflächen 80 in dichtender Anlage gehalten.In the compound groove 192 extends through the
Über die Hochdruckzuleitung 44 dem Einspritzventil 10 zugeführter Brennstoff kann somit praktisch ungehindert zur weiteren Hochdruckzuleitung 44' strömen und gleichzeitig über das Rückschlagventil 74 und den Stabfilter 72' der Speicherkammer 68 zugeführt werden. Im Übrigen kann das Einspritzventil 10 beispielsweise wie in der
Auch bei dem in der
Rechtwinklig zur Längsachse 28 und bezüglich dieser seitlich versetzt verläuft durch den Gehäusekörper 152 hindurch die Bohrung 54. Diese schneidet die Verbindungsbohrung 196, sodass die Bohrung 54 mit der diskreten Speicherkammer 68 strömungsverbunden ist. Die Bohrung 54 könnte jedoch auch derart angeordnet sein, dass ihre Achse 54' die Längsachse 28 schneidet.Perpendicular to the
Die Bohrung 54 ist sich stufenartig verjüngend ausgebildet, wobei sie sich von ihrem engsten, einen Zuströmabschnitt 200 bildenden Teil, in Richtung gegen aussen, konisch erweitert um eine Hochdruckdichtfläche 24 zu bilden. An dieser liegt ein Druckrohrstutzen 202 mit seiner Hochdruckgegendichtfläche 40 dichtend an. Der Druckrohrstutzen 202 ist allgemein bekannter Bauweise und weist im vorliegenden Fall keine diskrete Speicherkammer 68 auf. Grundsätzlich kann er jedoch mit einer derartigen Speicherkammer versehen und so aufgebaut sein, wie weiter oben bschrieben.The
Andernends ist die Bohrung 54 mittels eines in den Gehäusekörper 152 eingewindeten Dichtstopfens 178 dicht verschlossen. Dazu wirkt zwischen dem Dichtstopfen 178 und dem Gehäusekörper 152 ein Dichtungsring 168.At the other end, the
An einem vom Dichtstopfen 178 abstehenden und mit diesem einstückig ausgebildeten Stopfenschaft 204 ist der Stabfilter 72' angeformt, welcher ansonsten genau gleich ausgebildet ist wie weiter oben beschrieben und beispielsweise in den
Zwischen dem axialen Endbereich 94 und dem Dichtstopfen 178 ist der Stopfenschaft 204 mit einem reduzierten Querschnitt ausgestattet, um einen adäquaten Strömungsquerschnitt zur Verbindungsbohrung 196 herzustellen.Between the
Die dem Zuströmabschnitt 200 zugewandte Stirnseite des Stabfilters 72' bildet den Anschlag 106 für das als Ventilgliedplättchen 100' ausgebildete Ventilglied 100 des Rückschlagventils 74. Es weist auf seiner dem Stabfilter 72 zugewandten Seite den Zentriervorsprung 180 auf, welcher vom diesseitigen Ende der Schraubenfeder 104 umgriffen ist, wobei letztere in die Zentrierausnehmung 176 des Stabfilters 72' eingrifft und sich an deren Boden abstützt. Durch die Schraubenfeder 104 ist das Ventilgliedplättchen 100' zurückdrängbar am Ventilsitz 98 in Anlage gehalten, welcher durch eine stufenartige Verengung der Bohrung 54 gebildet ist. Auch hier verbindet der zentrale Drosseldurchlass 102 durch das Ventilgliedplättchen 100' hindurch, auch in Schliessstellung des Rückschlagventils 74, die Hochdruckzuleitung 44 mit der Speicherkammer 68 dauernd. Im Übrigen kann auch hier das Einspritzventil 10 entsprechend der
Die Funktionsweise und Wirkung des Rückschlagventils 74 mit Bypassdrossel ist bei sämtlichen Ausführungsformen dieselbe und wie weiter oben beschrieben.The operation and effect of the
Claims (10)
- A device for injecting highly pressurized fuel into a combustion chamber (14) of an internal combustion engine (12), having an injection valve (10), having a discrete accumulator chamber (68), which is arranged in a housing (36) and is assigned to the injection valve (10), for the fuel, which accumulator chamber (68) is connected by means of a supply line connection (42) of the housing (36) to a high-pressure supply line (44), whereby a further high-pressure supply line (44'), which serves to feed a further injection valve (10), is connected to the housing (36) and the housing (36) has a connecting passage (50) which leads to the further high-pressure line (44'), characterized in that the housing (36) has, at its free end, a supply line connection (42) which is arranged concentrically with respect to the longitudinal axis (32), and the housing (36) is engaged around by a clamp (48) by means of which a further high-pressure supply line (44'), is connected to the housing (36).
- The device as claimed in claim 1, characterized in that a flow-restricting valve (110) for the fuel is arranged in the housing (36).
- The device as claimed in claim 2, characterized in that the flow-restricting valve (110) has a plunger (114), which is designed for interacting with a seat (112), and a piston element (118) against which the plunger (114), by means of its side facing away from the seat (112), bears in spring-loaded fashion.
- The device as claimed in one of claims 1 to 3, characterized in that a non-return valve (74), which acts between the accumulator chamber (68) and the high-pressure supply line (44), is arranged in the housing (36), for the fuel, which non-return valve (74) has a valve member (100) which interacts with a valve seat (98) having a throttle passage (102) for the fuel and a filter (72) for the fuel, which filter (72) is arranged in the housing (36) and forms a stop (106) for limiting the opening movement of the valve member (100).
- The device as claimed in claim 4, characterized in that the filter (72) has an edge-type filter (72') which forms the stop (106).
- The device as claimed in claim 4 or 5, characterized in that the valve member (100) is designed as a valve member plate (100') with the throttle passage (102).
- The device as claimed in one of claims 4 to 6, characterized in that the valve seat (98) is integrally formed on the housing (36).
- The device as claimed in one of claims 4 to 7, characterized in that the injection valve (10) has a valve housing (22) with a high-pressure sealing surface (24) which points toward the outside and which surrounds a fuel inlet opening (26) of the valve housing (22), a pressure connector (30) for conducting fuel to the fuel inlet opening (26), an accumulator housing (36) which delimits the discrete accumulator chamber (68) for the fuel, which accumulator housing (36) comprising the supply line connection (42) is at one side connected to the high-pressure supply line (44, 44') and at the other side has a pressure pipe (34) which bears, by means of a high-pressure counterpart sealing surface (40) formed in a free end region, against the high-pressure sealing surface (24), and a clamping device (41) for pressing the high-pressure counterpart sealing surface (40) sealingly against the high-pressure sealing surface (24) engages on the pressure connector (30).
- The device as claimed in one of claims 4 to 7, characterized in that the injection valve (10) has an injection valve housing (22) comprising the supply line connection (42), in which injection valve housing (22) the accumulator chamber (68), the non-return valve (74) and the filter (72) are arranged and which is engaged around by the clamp (48).
- The device as claimed in claim 9, characterized in that the injection valve housing (22) has a housing body (152), which delimits the accumulator chamber (68), and a connection piece (150) which is arranged on said housing body (152) and which is connected to the high-pressure supply line (44), in which connection piece (150) the non-return valve (74) and the filter (72) are arranged and on which connection piece (150) the valve seat (98) is preferably integrally formed.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH14282007 | 2007-09-13 | ||
PCT/CH2008/000375 WO2009033304A1 (en) | 2007-09-13 | 2008-09-05 | Fuel injection device |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2188516A1 EP2188516A1 (en) | 2010-05-26 |
EP2188516B1 true EP2188516B1 (en) | 2011-10-26 |
Family
ID=39032168
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20080783475 Active EP2188516B1 (en) | 2007-09-13 | 2008-09-05 | Fuel injection device |
Country Status (5)
Country | Link |
---|---|
US (1) | US8336524B2 (en) |
EP (1) | EP2188516B1 (en) |
AT (1) | ATE530761T1 (en) |
BR (1) | BRPI0816923A2 (en) |
WO (1) | WO2009033304A1 (en) |
Cited By (1)
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WO2014131497A1 (en) * | 2013-03-01 | 2014-09-04 | Ganser-Hydromag Ag | Device for injecting fuel into the combustion chamber of an internal combustion engine |
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US8622046B2 (en) | 2010-06-25 | 2014-01-07 | Caterpillar Inc. | Fuel system having accumulators and flow limiters |
AT511716B1 (en) * | 2011-12-09 | 2013-02-15 | Bosch Gmbh Robert | CONNECTION OF HIGH PRESSURE MEDIUM LEADING COMPONENTS OF AN INJECTION DEVICE FOR INTERNAL COMBUSTION ENGINES |
AT512297B1 (en) * | 2012-02-07 | 2013-07-15 | Bosch Gmbh Robert | THREAD CONNECTION OF HIGH-PRESSURE MEDIUM LEADING COMPONENTS OF AN INJECTION DEVICE FOR INTERNAL COMBUSTION ENGINES |
AT511801B1 (en) | 2012-02-07 | 2013-03-15 | Bosch Gmbh Robert | METHOD FOR INFLUENCING THE THREADED GEOMETRY OF AN INTERNAL THREAD FOR INTERNAL COMBUSTION ENGINES |
JP6141328B2 (en) * | 2012-02-07 | 2017-06-07 | ガンサー−ハイドロマグ アーゲーGanser−Hydromag Ag | Fuel injection valve and fuel injection device |
AT512277B1 (en) * | 2012-04-10 | 2013-07-15 | Bosch Gmbh Robert | Injector of a modular common rail fuel injection system with flow restrictor |
AT512162B1 (en) * | 2012-05-08 | 2013-06-15 | Bosch Gmbh Robert | Locking pin with flow limiter |
AT513321A1 (en) * | 2012-08-16 | 2014-03-15 | Bosch Gmbh Robert | Threaded connection for connecting components with high pressure medium |
USD763413S1 (en) * | 2013-02-14 | 2016-08-09 | Yanmar Co., Ltd. | Fuel injection pipe |
USD762823S1 (en) * | 2013-02-14 | 2016-08-02 | Yanmar Co., Ltd. | Fuel injection pipe |
US9234488B2 (en) | 2013-03-07 | 2016-01-12 | Caterpillar Inc. | Quill connector for fuel system and method |
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DE102015220028A1 (en) * | 2015-10-15 | 2017-04-20 | Robert Bosch Gmbh | Flow restrictor for one injector |
WO2020260285A1 (en) | 2019-06-25 | 2020-12-30 | Ganser Hydromag Ag | Fuel injection valve for combustion engines |
USD934299S1 (en) * | 2020-01-29 | 2021-10-26 | Caterpillar Inc. | Injector |
USD934298S1 (en) | 2020-01-29 | 2021-10-26 | Caterpillar Inc. | Injector |
JP2023513634A (en) | 2020-02-17 | 2023-03-31 | ガンサー-ハイドロマグ アーゲー | Fuel injection valve for internal combustion engine |
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WO2023166139A1 (en) | 2022-03-03 | 2023-09-07 | Ganser-Hydromag Ag | Fuel injection valve for internal combustion engines |
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-
2008
- 2008-09-05 US US12/677,522 patent/US8336524B2/en active Active
- 2008-09-05 BR BRPI0816923 patent/BRPI0816923A2/en not_active IP Right Cessation
- 2008-09-05 EP EP20080783475 patent/EP2188516B1/en active Active
- 2008-09-05 WO PCT/CH2008/000375 patent/WO2009033304A1/en active Application Filing
- 2008-09-05 AT AT08783475T patent/ATE530761T1/en active
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2014131497A1 (en) * | 2013-03-01 | 2014-09-04 | Ganser-Hydromag Ag | Device for injecting fuel into the combustion chamber of an internal combustion engine |
US9803603B2 (en) | 2013-03-01 | 2017-10-31 | Ganser-Hydromag Ag | Device for injecting fuel into the combustion chamber of an internal combustion engine |
Also Published As
Publication number | Publication date |
---|---|
US8336524B2 (en) | 2012-12-25 |
EP2188516A1 (en) | 2010-05-26 |
WO2009033304A1 (en) | 2009-03-19 |
US20100170476A1 (en) | 2010-07-08 |
ATE530761T1 (en) | 2011-11-15 |
WO2009033304A8 (en) | 2010-03-18 |
BRPI0816923A2 (en) | 2015-03-17 |
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