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
  • F02M61/14—Arrangements of injectors with respect to engines; Mounting of injectors
• • 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

Definitions

• a clamping claw for fastening a fuel injector to a cylinder head on an internal combustion engine comprising an assembly comprising a clamping claw and a fuel injection system comprising a clamping claw
• the invention relates to a clamping claw for fixing a fuel injector to a cylinder head of an internal combustion engine with the features of the preamble of claim 1. Furthermore, the invention relates to an arrangement and a fuel injection system comprising such a clamping claw. In addition, a further use of a clamping claw is proposed.
• An arrangement comprising a clamping claw and an injector is known for example from DE 10 2007 008 146 AI.
• the clamping claw serves to fix the injector in a bore of a cylinder head of an internal combustion engine.
• the clamping claw is indirectly supported by an additional body on the injector and bolted by a clamping screw in the cylinder head.
• About the clamping claw acting in the axial direction of the clawing force is transmitted to the injector, which holds this in contact with the cylinder head.
• the additional body and the clamping claw recesses, which also extend in the axial direction.
• the high-pressure connection of the fuel injector is guided laterally past the additional body, ie outside the additional body and the clamping claw.
• the high-pressure connection can be connected to a supply line, which ensures the supply of the injector with fuel under high pressure.
• DE 43 18 434 AI also discloses a holding device for a fuel injection valve of a diesel engine, which comprises a clamping bracket, which is fastened via a clamping screw on the cylinder head of an internal combustion engine, that an adjoining the clamping bracket nozzle holder is subjected to an axial force.
• the clamping bracket is supported for this purpose on the nozzle holder, wherein a ball socket of the clamping bracket engages in a conical depression of the nozzle holder.
• Both the ball socket and the conical recess are penetrated by a pressure channel, so that there is a hydraulic connection via the seat of the ball socket.
• the axial force applied via the clamp causes a sealing force in the area of the sealing contact of the ball socket with the conical depression of the nozzle holder.
• the trained in the clamp pressure channel ends at an end face of the tension bow and forms there a conical depression, in which by means of a union nut, the end cone of an injection line is sealingly pressed.
• a leakage oil hole is provided in the tension bow, which is guided largely parallel to the pressure channel, but ends outside of the ball socket or outside of the conical depression of the tension bracket.
• the cylinder head of the diesel engine can be made simpler and less expensive.
• the present invention the object of further simplifying the fuel supply to an injector, which is set via a clamping claw on the cylinder head of an internal combustion engine, and thus to make even more cost effective.
• the clamping claw with the features of claim 1 the arrangement with the features of claim 5 and the fuel injection system with the features of claim 9 are proposed.
• Advantageous developments of the invention are specified in the respective subclaims. Disclosure of the invention
• the proposed to solve the problem clamping claw has a first bore for receiving a clamping screw and at least one further bore for forming a high pressure passage, wherein the further bore is guided substantially perpendicular to the first bore.
• the further bore passes through the clamping claw and extends from a first side face to a second side face of the clamping claw which is substantially parallel with respect to the first side face, so that the further bore is connected via a high-pressure line to a bore of another clamping claw which also serves as a high-pressure channel. or a high pressure pump is connectable.
• the proposed embodiment of the clamping claw according to the invention has the advantage that it can also be used as a high-pressure accumulator.
• the clamping claw thus takes on the one hand the function of a fastener, on the other hand, the function of a memory. In this way, the number of components required for injecting fuel into the combustion chamber of an internal combustion engine can be reduced and costs can be saved.
• connection device which is formed in the region of a side face of the clamping claw for the connection of a high-pressure line.
• the connection device can be designed, for example, as an inwardly directed receptacle or as an outwardly directed connection piece.
• the connection device is provided with a thread, wherein the thread can be an internal or external thread depending on the specific configuration of the connection device.
• the end of the high-pressure line to be connected to the connection device is designed to be the same and accordingly has an external or internal thread or a connection element, such as a union nut or the like, with a counter-equivalent thread.
• the connection device must ensure a high-pressure-tight connection, as the high-pressure line and the high-pressure channel carry high-pressure fuel.
• connection device of the further bore of the clamping claw can alternatively or additionally serve to receive a pressure sensor, a pressure regulating valve or a pressure limiting valve. Also in this case, a thread proves to be advantageous, since the connection of the sensor or the valve with the clamping claw can be produced via a screw connection.
• a branch hole which is guided substantially perpendicular to the first bore and / or the further bore and a high-pressure line or a high-pressure lance with a fuel! Njektor is connectable.
• the branch bore or the high-pressure line or high-pressure lance connected thereto serves to supply the fuel injector with fuel under high pressure. If the supply takes place via a high-pressure line, this can be led laterally to the clamping claw and connected to the branch bore via a connection device formed in or on this side surface.
• the branch hole is guided in this case substantially perpendicular to the first and the further bore.
• At least one high-pressure lance is provided for supplying the fuel injector with high-pressure fuel, this is preferably guided substantially parallel to the longitudinal axis A of the fuel injector.
• the clawing force applied via the clamping claw can then also be used to seal the contact areas between the high-pressure lance and the clamping claw and / or the fuel injector. Because the high pressure lance acts in this case as a pressure transmitting member.
• At least two high-pressure lances are provided for supplying the fuel injector with fuel under high pressure, which are arranged rotationally symmetrical in order to ensure a uniform distribution of the Pratzkraft or sealing force. Since it is necessary to connect each high-pressure lance with the further bore of the clamping claw serving as a high-pressure channel, the number of branch bores preferably corresponds to the number of high-pressure lances. In order to enable a connection of more than two high-pressure lances via a respective branch hole with the further bore, at least one Branch hole also have an angled course.
• the branch bore for receiving a high-pressure lance essentially has a parallel course with respect to the longitudinal axis A of the fuel injector. It thus runs essentially parallel to the first bore and perpendicular to the further bore of the clamping claw.
• connection of serving as a high-pressure channel further bore of the clamping claw with the fuel! Njektor via a high-pressure line or high-pressure lance makes the formation of a high-pressure nozzle on the injector dispensable.
• the connection of the clamping claw is made with the injector via at least one high pressure lance, since these - in contrast to a flexible high pressure line - can be used as a pressure transmitting member.
• the clawing force of the clamping claw therefore also serves as sealing force.
• the high-pressure lance is part of the clamping claw or integrally connected thereto.
• high pressure lances also allows the compensation of custom length variants by a corresponding reduction of the high pressure lance is made.
• uniform injectors can be used independently of the respective customer.
• a corresponding identical part strategy significantly simplifies manufacturing processes. If length adjustments are required, they will be made on the high pressure lance.
• the clamping claw has at least one recess for the passage and / or reception of a low-pressure line.
• the at least one recess can also serve to carry and / or receive an electrical line.
• the recess preferably extends substantially parallel with respect to the first bore.
• an arrangement comprising a clamping claw according to the invention and a fuel injector fixed to a cylinder head of an internal combustion engine by means of the clamping claw are also proposed, the clamping claw and the fuel injector being connected via at least one high-pressure line. tion or high-pressure lance are connected and wherein the clamping claw is connected via at least one high-pressure line with another clamping claw for fixing a further fuel injector on the cylinder head of the internal combustion engine and / or a high-pressure pump.
• the arrangement according to the invention accordingly comprises at least one clamping claw and at least one fuel injector fixed to the cylinder head by means of the clamping claw, a high-pressure line or high-pressure lance for connecting the clamping claw to the injector and at least one further high-pressure line for connecting the clamping claw to a further clamping claw and / or a high-pressure pump.
• the arrangement has substantially all the components of a fuel injection system, but the arrangement of a separate high-pressure accumulator between the high-pressure pump and the fuel injector is dispensable. Because the required storage volume is provided in an inventive arrangement, at least in part of the clamping claw available.
• the high-pressure pump connected to the clamping claw via a high-pressure line conveys directly into the further bore of the clamping claw, from where the fuel is supplied to the injector via at least one further high-pressure line or at least one high-pressure lance.
• the clamping claw for fixing the fuel injector on the cylinder head of the internal combustion engine can thus serve at the same time as a high-pressure accumulator.
• a separate high-pressure accumulator can thus be omitted.
• the at least one high pressure lance is substantially parallel with respect to the longitudinal axis A of the fuel! Njektors led.
• the high-pressure lance can at the same time be used as a pressure transmission member in this way, so that the pricking force transmitted via the high-pressure lance also serves for the sealing in the region of the connection points.
• the high-pressure lance has at least one end of a preferably conical or spherical shaped sealing contour. This acts preferably with a counterparts, ie spherical or conical shaped sealing contour on the fuel injector and / or on the clamping claw together, so that the seal is high pressure-tight.
• the arrangement further has a traverse which can be connected to at least one clamping claw via a plug-in, latching, screwing and / or clamping connection, so that a low-pressure line accommodated in a recess of the clamping claw and / or electrical Conduction of a fixed by means of the clamping claw on the cylinder head fuel injector to a guided in the traverse low pressure line or electrical line can be connected.
• the traverse thus ensures the connection of the fuel injector to a return and / or a power supply.
• the traverse can also serve to receive a high-pressure line which connects two clamping claws or a clamping claw with a high-pressure pump. In this way, all lines are kept safe.
• the traverse has at least one plug-in contact for the electrical connection of a fuel injector.
• the fuel In this case, the ejector is preferably provided with a contact of the same shape, so that the required electrical connection can be effected in a simple manner by plugging.
• a fuel injection system for injecting fuel into the combustion chamber of an internal combustion engine with a clamping claw according to the invention for fixing a fuel injector to a cylinder head of the internal combustion engine is also proposed.
• the fuel injection system comprises a plurality of such clamping claws, wherein each clamping claw of the determination of a fuel injector on the cylinder head of the internal combustion engine and the supply of the fuel injector is used with fuel.
• the plurality of clamping claws preferably in a series arrangement, then form a segmented high-pressure accumulator.
• the above-mentioned object is further achieved by the use of a clamping claw for fixing a fuel injector to a cylinder head of an internal combustion engine. ne solved when the clamping claw is also used as a high-pressure accumulator through which the fuel injector is supplied with fuel under high pressure for injection into the combustion chamber of the internal combustion engine.
• a separate high-pressure accumulator for example in the form of a common rail, can thus be dispensed with. The supply of fuel to the fuel injector is simplified and thus cheaper.
• FIG. 1 shows a schematic sectional view of a first arrangement according to the invention
• FIG. 2 shows a schematic plan view of a second arrangement according to the invention
• FIG. 3 shows a schematic perspective view of a third arrangement according to the invention
• Figure 4 is a schematic perspective view of a fourth arrangement according to the invention.
• Figure 5 is a schematic perspective view of a fifth arrangement according to the invention.
• FIG. 1 The arrangement shown in Figure 1 comprised a clamping claw 1, by means of which a fuel injector 2 is fixed to a cylinder head 3 of an internal combustion engine.
• the fuel injector 2 is at least partially received in a bore 17 of the cylinder head and supported indirectly on a shoulder 18 via a sealing element 19.
• a nozzle 20 of the fuel! Njektors 2 is brought up to the combustion chamber of the internal combustion engine (not shown). Via the nozzle 20, high-pressure fuel can be injected into the combustion chamber of the internal combustion engine, provided the fuel injector 2 is under high pressure fuel is supplied.
• the supply of fuel under high pressure takes place via the clamping claw 1 and at least one high-pressure line 9, which connects the clamping claw 1 to the fuel injector 2.
• FIG. 1 Another, not shown in the figure 1 high-pressure line 9 is used to connect the clamping claw 1 with a high-pressure pump (also not shown).
• the clamping claw 1 of Figure 1 therefore takes over at the same time the function of a high-pressure accumulator.
• the clamping claw 1 different holes 4, 6, 11.
• the bore 4 is guided substantially parallel to the longitudinal axis A of the fuel injector 2. By tightening the clamping screw 5 can thus be transmitted to the fuel injector 2 effective in the axial direction Pratzkraft.
• the clamping claw 1 has a further bore 6, which passes through the clamping claw 1 and in this case extends from a side surface 7 to a side surface 8. These are the long side surfaces 7, 8 of the bow-shaped clamping claw 1.
• the further bore 6 is thus guided substantially perpendicular to the first bore 4.
• a connection device 10 is formed, which has an internal thread for the connection of the high-pressure line 9.
• the connected end of the high pressure line 9 has corresponding thereto an external thread or a connecting element with an external thread.
• the high pressure line 9, an internal thread or a connecting element with an internal thread and the terminal 10 of the branch hole 11 have an external thread.
• the external thread is then preferably embodied on a connecting device 10 designed as a connecting piece.
• the branch bore 11 is guided substantially perpendicular to the further bore 6 and the first bore 4.
• the arrangement shown in FIG. 2 represents a sequence of the arrangement according to the invention shown in FIG. 1, with a total of four such arrangements being shown, which are connected via high-pressure lines 9.
• the last clamping claw 1 (right side of the image) has only one connected high-pressure line 9, the is connected via a connection device 10 with the further bore 6 of the adjacent clamping claw 1 in connection.
• a pressure sensor 21 is used for pressure monitoring in the further bore 6 or in the connection device 10 provided therein.
• FIG. 3 is a further embodiment of an arrangement according to the invention comprising a clamping claw 1 and a fuel. to remove the ejector 2.
• the clamping claw 1 has in this embodiment 2 first holes 4, which each serve to receive a clamping screw 5 (not shown).
• a further bore 6 can be seen, which opens into a connection device 10. This serves to connect a high-pressure line 9 (not shown) in order to supply the clamping claw 1 with fuel under high pressure.
• the further bore 6 is guided substantially perpendicular to the first holes 4.
• the clamping claw 1 has two branch bores 11, which serve to connect two high-pressure lances 12 to the further bore 6.
• the branch bores 11 are not shown in FIG.
• the branch bores 11 open not on a short side surface of the clamping jaw 1, but in this case on the non-visible underside of the clamping claw 1.
• the high-pressure lances 12 have sealing contours 14 or be threaded.
• the high-pressure lances 12 are already connected in one piece with the clamping claw 1.
• the fuel! Njektor 2 facing ends the high-pressure lances 12 each have a conically shaped sealing contour 14, which cooperate sealingly with a bore 22 of the fuel injector 2, when applied to the high-pressure lances 12 via the clamping claw 1, a Pratzkraft.
• the clamping claw 1 of Figure 3 further comprises a recess 13 which passes through the clamping claw 1 and extending from the top to the bottom of the clamping claw 1.
• the recess 13 is used to carry out further connections of the fuel injector 2, in particular a low-pressure or return line and the electrical connections for the electrical supply of an integrated into the fuel injector 2 control valve (not shown).
• the recess 13 takes the appropriate chenden connections of the fuel injector 2 with play. It thus leaves enough space for the production of the connections.
• FIG. 4 The illustration of Figure 4 is shown in a further arrangement according to the invention, which largely corresponds to that of Figure 3.
• the clamping claw 1 shown in Figure 4 has two first holes 4 for receiving clamping screws 5 (not shown), also two high pressure lances 12 for supplying the fuel injector 2 with high pressure fuel.
• the clamping claw 1 of Figure 4 in the region of the recess 13 has a depression, in which the traverse 15 is at least partially used.
• Plug contacts 16 formed on the underside of the traverse 15 are guided through the recess 13 of the clamping claw 1 and connected to corresponding contacts of the fuel injector 2. The plug contacts 16 thus ensure the electrical connection of the fuel injector 2.
• the traverse 15 extends transversely to the tensioning clamps arranged in a row, so that the traverse 15 simultaneously effects a connection of the clamping claws.
• the traverse 5 shown in FIGS. 4 and 5 can also serve to guide a low-pressure or return line to which the fuel injectors are to be connected.

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

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

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ID=47884335

Family Applications (1)

Country Status (5)

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Citations (3)

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• 2012
  • 2012-04-19 DE DE102012206486A patent/DE102012206486A1/de not_active Withdrawn
• 2013
  • 2013-03-14 IN IN7311DEN2014 patent/IN2014DN07311A/en unknown
  • 2013-03-14 WO PCT/EP2013/055268 patent/WO2013156215A1/de not_active Ceased
  • 2013-03-14 CN CN201380020484.XA patent/CN104395599B/zh not_active Expired - Fee Related
  • 2013-03-14 EP EP13709433.0A patent/EP2839141B1/de not_active Not-in-force

Patent Citations (3)

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