EP3945206B1 - Injector clamp - Google Patents

Injector clamp Download PDF

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Publication number
EP3945206B1
EP3945206B1 EP21000191.3A EP21000191A EP3945206B1 EP 3945206 B1 EP3945206 B1 EP 3945206B1 EP 21000191 A EP21000191 A EP 21000191A EP 3945206 B1 EP3945206 B1 EP 3945206B1
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EP
European Patent Office
Prior art keywords
claw
bolt
internal combustion
combustion engine
injector
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Active
Application number
EP21000191.3A
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German (de)
French (fr)
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EP3945206A1 (en
Inventor
Alfred Inden
Johannes KLOSTERBERG
Thomas Werner
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Deutz AG
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Deutz AG
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Publication of EP3945206A1 publication Critical patent/EP3945206A1/en
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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
    • F02M61/14—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
    • 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
    • F02M2200/85—Mounting of fuel injection apparatus
    • F02M2200/852—Mounting of fuel injection apparatus provisions for mounting the fuel injection apparatus in a certain orientation, e.g. markings or notches
    • 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
    • F02M2200/85—Mounting of fuel injection apparatus
    • F02M2200/855—Mounting of fuel injection apparatus using clamp elements or fastening means, e.g. bolts or screws
    • 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
    • F02M2200/85—Mounting of fuel injection apparatus
    • F02M2200/858—Mounting of fuel injection apparatus sealing arrangements between injector and engine

Definitions

  • the invention relates to an injector clamp with a clamp screw on an internal combustion engine.
  • Such injector jams on an internal combustion engine are known, for example, from the EN 102007050512A1 .
  • a device for fastening a fuel injection nozzle in a cylinder head of an internal combustion engine is known.
  • the fuel injection nozzle penetrates the cylinder head and is clamped to the cylinder head with a fork element and a screw.
  • the fork element consists of two legs that rest on the collar of the fuel injection nozzle on both sides.
  • the EP 1 887 215 A1 discloses a clamping device for clamping an injector against an injector seat comprising: a screw, an elastic element, a washer and a fork.
  • the screw has a screw head and a cylindrical screw body.
  • the elastic element is penetrated by the screw body and is arranged between the screw head and the washer.
  • the washer rests on the fork and applies the clamping force of the screw to it.
  • the fork has two prongs which are supported on both sides of the injector.
  • the EP 2 113 654 B1 an assembly for attaching one or more injection nozzle holders to a cylinder head of an internal combustion engine.
  • DE 10340911 B4 shows such an injector failure on an internal combustion engine.
  • a device for fastening an injection nozzle holder to the cylinder head by means of a two-armed clamping claw and a clamping screw is known, for example, from DE 195 21 363 C1 known.
  • the fork-shaped claw arms of the clamping claw on the injector holder and the clamping screw on the clamping claw must be threaded on site for each injection valve of the internal combustion engine, as they cannot be assembled together due to their structural shape. This prevents automatic assembly of the injector holder on the cylinder head.
  • the nozzle clamping device has contact parts which sit on clamping seats of the fuel injectors. Between the contact parts, the nozzle clamping device has a bolt insertion hole into which a clamping bolt is inserted to exert a pressure against the fuel injectors and to release sealing loads.
  • the nozzle clamping device includes a clearance which reduces the compressive force on the fuel injectors so that at a predetermined level of bolt tightening force, a substantially equal compressive force occurs on the three fuel injectors.
  • the nozzle clamping device is made of a spring material such that the nozzle clamping device is slightly bent.
  • the invention is based on the object of avoiding the above-mentioned disadvantages and of improving an internal combustion engine of the above-mentioned type with regard to assembly and ease of maintenance, which at the same time increases the elasticity and stability of the screw assembly.
  • FIG.1 an injection injector clamp is shown, which uses a clamp 1 to fasten an injector 3 to a cylinder head of a diesel engine.
  • a beam-like element supports the clamp 1 with one end rests on a support surface 2 on the injector 3, while the second end rests on a surface 5 on the cylinder head 4.
  • a screw 7 arranged between the two ends presses the claw 1 against the support surfaces, which results in the axial pressure force on the injector for sealing and fixes the injector in the receiving bore 9.
  • the receiving bore 9 for the injector 3 is only partially formed by a bore in the cylinder head.
  • a copper sleeve 10 is installed in a bore through the water jacket, the interior of which forms the receiving bore for the injector 3.
  • the sealing ring 11 of the injector 3 is also supported in this copper sleeve 10, which seals the combustion chamber against the annular fuel chamber between the injector 3 and the copper sleeve 10.
  • the high compression on the sealing ring support on the side of the copper sleeve can lead to settling and, as a result, a drop in the sealing force on the injector. The result is leaks.
  • a clamp screw connection can be seen, which leads to an increased elasticity of the screw connection, so that the loss of sealing force as a result of setting is significantly reduced.
  • a sleeve 12 is installed between the screw head collar 17 and the clamping claw 1.
  • the screw 7 is designed as an expansion screw 7 with a reduced shaft diameter.
  • the greatly increased screw length and the reduced shaft diameter of the expansion screw 7 due to the sleeve 12 significantly increase the elasticity of the screw assembly.
  • a further contribution to the increase in elasticity is achieved by the sleeve 12 itself.
  • the result is a greatly increased overall elasticity in the screw assembly, which significantly reduces the loss of preload force in the event of settling.
  • Fig.2 shows an injection injector clamp which uses a clamp 1 to fasten an injector 3 to a cylinder head of a diesel internal combustion engine.
  • the clamping claw 1 rests with one end on a support surface 2 on the injector 3, while the other end rests on a surface 5 on the cylinder head 4.
  • a screw 7 arranged between the two ends presses the claw 1 against the support surfaces 2 and 5 by means of a sleeve 12 which is arranged concentrically around the claw screw 7 between the claw screw 7 and the clamping claw 1, which results in the axial compressive force on the injector for sealing and fixes the injector 3 in the receiving bore 9.
  • the claw screw 7 is designed as an expansion screw with a reduced shaft diameter.
  • the sleeve 12 has a conical surface 18 on the underside for resting on the spherical counter surface of the clamping claw 1. On the top side, the sleeve has a flat contact surface 16 towards the screw head collar 17, so that the contact surface 16 is arranged perpendicular to the screw axis and lies plane-parallel to the screw head collar.
  • the receiving bore 9 for the injector 3 is only partially realized by a bore in the cylinder head. There is no continuous cast pipe through the water jacket. Instead, a copper sleeve 10 is installed in a bore through the water jacket, the interior of which forms the receiving bore for the injector 3.
  • the sealing ring 11 of the injector 3 is also used in this copper sleeve 10, which seals the combustion chamber against the annular fuel chamber between the injector 3 and the copper sleeve 10.
  • the claw screw 7 has three collars 13, 14, 15 on the shaft.
  • the lower collar 13 is used to center the clamping claw 1.
  • the middle collar 14 and the upper collar 15 are used to center the sleeve 12, which ensures a stable structure of the connection.
  • the sleeve 12 Because of the conical shape of the sleeve on the contact surface 18 to the claw 1, the sleeve 12 must not be installed the wrong way round, i.e. with the conical support 18 towards the screw head.
  • the bore of the sleeve 12 is designed in stages. The lower part 19 of the bore is smaller in diameter than that of the middle centering collar 14 of the screw 7. If the sleeve 12 is put on the screw 7 the wrong way round, it can only be put on up to the middle collar 14. The position of the middle collar 14 is selected so that the thread the screw 7 cannot engage in the threaded hole on the cylinder head 4 in order to prevent incorrect assembly.

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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)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)

Description

Die Erfindung betrifft eine Injektorverpratzung mit einer Pratzenschraube an einer Brennkraftmaschine.The invention relates to an injector clamp with a clamp screw on an internal combustion engine.

Derartige Injektorverpratzungen an einer Brennkraftmaschine sind beispielsweise bekannt aus der DE 102007050512A1 .Such injector jams on an internal combustion engine are known, for example, from the EN 102007050512A1 .

Aus der US 6,170,467 B1 ist eine Vorrichtung zur Befestigung einer Kraftstoffeinspritzdüse in einem Zylinderkopf eines Verbrennungsmotors bekannt. Die Kraftstoffeinspritzdüse durchdringt den Zylinderkopf und ist mit einem Gabelelement mit einer Schraube gegenüber dem Zylinderkopf verspannt ist. Das Gabelelement besteht dabei aus zwei Schenkeln, die sich beiderseits der Kraftstoffeinspritzdüse auf Kragen der Kraftstoffeinspritzdüse abstützen.From the US6,170,467 B1 A device for fastening a fuel injection nozzle in a cylinder head of an internal combustion engine is known. The fuel injection nozzle penetrates the cylinder head and is clamped to the cylinder head with a fork element and a screw. The fork element consists of two legs that rest on the collar of the fuel injection nozzle on both sides.

Die EP 1 887 215 A1 offenbart eine Klemmvorrichtung zum Klemmen eines Injektors gegen einen Injektorsitz umfassend: eine Schraube, ein elastisches Element, eine Unterlegscheibe und eine Gabel. Die Schraube weist einen Schraubenkopf und einen zylindrischen Schraubenkörper auf. Das elastische Element wird von dem Schraubenkörper durchdrungen und ist zwischen dem Schraubenkopf und der Unterlegscheibe angeordnet. Die Unterlegscheibe liegt auf der Gabel auf und beaufschlagt diese mit der Spannkraft der Schraube. Die Gabel hat zwei Zinken, die sich beidseitig an dem Injektor abstützen.The EP 1 887 215 A1 discloses a clamping device for clamping an injector against an injector seat comprising: a screw, an elastic element, a washer and a fork. The screw has a screw head and a cylindrical screw body. The elastic element is penetrated by the screw body and is arranged between the screw head and the washer. The washer rests on the fork and applies the clamping force of the screw to it. The fork has two prongs which are supported on both sides of the injector.

Weiter offenbart die EP 2 113 654 B1 einen Montageverbund zum Befestigen eines oder mehrerer Einspritzdüsenhalter an einem Zylinderkopf einer Brennkraftmaschine.The EP 2 113 654 B1 an assembly for attaching one or more injection nozzle holders to a cylinder head of an internal combustion engine.

Auch die DE 10340911 B4 zeigt eine derartige Injektorverpratzung an einer Brennkraftmaschine.Also the DE 10340911 B4 shows such an injector failure on an internal combustion engine.

Eine Vorrichtung zur Befestigung eines Einspritzdüsenhalters am Zylinderkopf mittels einer zweiarmigen Spannpratze und einer Spannschraube ist beispielsweise aus der DE 195 21 363 C1 bekannt. Bei der Montage müssen allerdings vor Ort für jedes Einspritzventil der Brennkraftmaschine die gabelförmigen Pratzenarme der Spannpratze am Einspritzdüsenhalter und die Spannschraube an der Spannpratze eingefädelt werden, da sie durch ihre konstruktiv vorgegebene Form nicht gemeinsam montiert werden können. Dies verhindert eine automatische Montage des Einspritzdüsenhalters am Zylinderkopf.A device for fastening an injection nozzle holder to the cylinder head by means of a two-armed clamping claw and a clamping screw is known, for example, from DE 195 21 363 C1 known. However, during assembly, the fork-shaped claw arms of the clamping claw on the injector holder and the clamping screw on the clamping claw must be threaded on site for each injection valve of the internal combustion engine, as they cannot be assembled together due to their structural shape. This prevents automatic assembly of the injector holder on the cylinder head.

Aus der US 7,334,572 B1 ist darüber hinaus ein System und ein Verfahren zum Befestigen eines Kraftstoffeinspritzventils in einem Verbrennungsmotor bekannt, die eine Schelle zum Befestigen angrenzender Einspritzventile an einem Zylinderkopf umfassen.From the US7,334,572 B1 Furthermore, a system and a method for securing a fuel injection valve in an internal combustion engine are known, which comprise a clamp for securing adjacent injection valves to a cylinder head.

Aus der EP 0 751 290 B1 ist eine Anordnung zum Festklemmen von zwei oder drei Kraftstoffeinspritzdüsen mit einer Düsenklemmeinrichtung bekannt. Hierbei weist die Düsenklemmeinrichtung Kontaktteile auf, die auf Klemmaufnahmesitzen der Kraftstoffeinspritzdüsen aufsitzen. Zwischen den Kontaktteilen weist die Düsenklemmeinrichtung ein Bolzeneinsatzloch auf, in das ein Klemmbolzen eingeführt ist, um einen Druck gegen die Kraftstoffeinspritzdüsen auszuüben und Abdichtlasten abzugeben. Die Düsenklemmeinrichtung beinhaltet ein Spiel, welches die Druckkraft auf die Kraftstoffeinspritzdüsen verringert, so dass bei einem vorbestimmten Grad an Bolzenanziehkraft eine im Wesentlichen gleiche Druckkraft auf den drei Kraftstoffeinspritzdüsen auftritt. Alternativ ist die Düsenklemmeinrichtung aus einem Federmaterial derart hergestellt, dass die Düsenklemmeinrichtung leicht gebogen wird.From the EP 0 751 290 B1 an arrangement for clamping two or three fuel injectors with a nozzle clamping device is known. Here, the nozzle clamping device has contact parts which sit on clamping seats of the fuel injectors. Between the contact parts, the nozzle clamping device has a bolt insertion hole into which a clamping bolt is inserted to exert a pressure against the fuel injectors and to release sealing loads. The nozzle clamping device includes a clearance which reduces the compressive force on the fuel injectors so that at a predetermined level of bolt tightening force, a substantially equal compressive force occurs on the three fuel injectors. Alternatively, the nozzle clamping device is made of a spring material such that the nozzle clamping device is slightly bent.

Der Erfindung liegt die Aufgabe zugrunde, die o. g. Nachteile zu vermeiden und eine Brennkraftmaschine der o. g. Art hinsichtlich Montage und Wartungsfreundlichkeit zu verbessern, die gleichzeitig die Elastizität und die Stabilität des Schraubenverbandes erhöht.The invention is based on the object of avoiding the above-mentioned disadvantages and of improving an internal combustion engine of the above-mentioned type with regard to assembly and ease of maintenance, which at the same time increases the elasticity and stability of the screw assembly.

Diese Aufgabe wird erfindungsgemäß durch eine Brennkraftmaschine gemäß Anspruch 1 und dem Verfahren gemäß Anspruch 8 gelöst. Vorteilhafte Ausgestaltungen der Erfindung sind in den weiteren Ansprüchen beschrieben.This object is achieved according to the invention by an internal combustion engine according to claim 1 and the method according to claim 8. Advantageous embodiments of the invention are described in the further claims.

Die Erfindung wird nachstehend an einem Ausführungsbeispiel näher erläutert. In der Zeichnung zeigen:

Fig. 1:
eine Injektorverpratzung gemäß dem Stand der Technik,
Fig. 2:
eine Injektorverpratzung,
Fig. 3:
die Injektorverpratzung aus Fig. 2 im Schnitt.
The invention is explained in more detail below using an exemplary embodiment. The drawing shows:
Fig.1:
an injector clamping system according to the state of the art,
Fig. 2:
an injector jam,
Fig. 3:
the injector jamming Fig.2 on average.

In Fig. 1 wird eine Einspritzinjektorverpratzung gezeigt, die mit einer Pratze 1 einen Injektor 3 an einem Zylinderkopf einer Dieselbrennkraftmaschine befestigt. Dabei stützt ein balkenähnliches Element die Spannpratze 1 mit einem Ende auf einer Auflagefläche 2 am Injektor 3 ab, während das zweite Ende am Zylinderkopf 4 auf einer Fläche 5 zur Auflage kommt. Eine zwischen beiden Enden angeordnete Schraube 7 drückt die Pratze 1 gegen die Auflageflächen, woraus am Injektor die zur Abdichtung axiale Druckkraft resultiert und den Injektor in der Aufnahmebohrung 9 fixiert.In Fig.1 an injection injector clamp is shown, which uses a clamp 1 to fasten an injector 3 to a cylinder head of a diesel engine. A beam-like element supports the clamp 1 with one end rests on a support surface 2 on the injector 3, while the second end rests on a surface 5 on the cylinder head 4. A screw 7 arranged between the two ends presses the claw 1 against the support surfaces, which results in the axial pressure force on the injector for sealing and fixes the injector in the receiving bore 9.

Die Aufnahmebohrung 9 für den Injektor 3 wird in diesem Ausführungsbeispiel nur teilweise durch eine Bohrung im Zylinderkopf realisiert. Es gibt hier keine durchgängige Gusspfeife durch den Wassermantel. Stattdessen wird in eine Bohrung durch den Wassermantel eine Kupferhülse 10 verbaut, deren Innenraum die Aufnahmebohrung für den Injektor 3 bildet. In dieser Kupferhülse 10 kommt auch der Dichtring 11 des Injektors 3 zur Auflage, welcher den Brennraum gegen den ringförmigen Kraftstoffraum zwischen Injektor 3 und Kupferhülse 10 abdichtet. Durch die hohe Verpressung an der Dichtringauflage auf Seiten der Kupferhülse kann es zu Setzerscheinungen und in dessen Folge zu einem Abfall der Dichtkraft am Injektor kommen. Die Folge sind Undichtigkeiten.In this embodiment, the receiving bore 9 for the injector 3 is only partially formed by a bore in the cylinder head. There is no continuous cast pipe through the water jacket. Instead, a copper sleeve 10 is installed in a bore through the water jacket, the interior of which forms the receiving bore for the injector 3. The sealing ring 11 of the injector 3 is also supported in this copper sleeve 10, which seals the combustion chamber against the annular fuel chamber between the injector 3 and the copper sleeve 10. The high compression on the sealing ring support on the side of the copper sleeve can lead to settling and, as a result, a drop in the sealing force on the injector. The result is leaks.

Im Ausführungsbeispiel, das in den Fig. 2 und 3 dargestellt wird, ist eine Pratzenverschraubung zu sehen, die zu einer erhöhten Elastizität des Schraubverbandes führt, so dass der Verlust an Dichtkraft infolge des Setzens deutlich gemindert wird. Im Unterschied zur Ausführungsform nach Fig. 1 wird bei der Injektorverpratzung nach Fig. 2 zwischen Schraubenkopfbund 17 und Spannpratze 1 eine Hülse 12 verbaut. Die Schraube 7 wird mit reduziertem Schaftdurchmesser als Dehnschraube 7 ausgeführt. Die durch die Hülse 12 stark erhöhte Schraubenlänge und der reduzierte Schaftdurchmesser der Dehnschraube 7 erhöht die Elastizität des Schraubenverbandes wesentlich. Ein weiterer Beitrag zur Elastizitätssteigerung wird durch die Hülse 12 selbst erreicht. Das Resultat ist eine stark erhöhte Gesamtelastizität im Schraubenverband, womit der Vorspannkraftverlust bei Setzerscheinungen deutlich vermindert wird.In the example shown in the Fig. 2 and 3 In the example shown, a clamp screw connection can be seen, which leads to an increased elasticity of the screw connection, so that the loss of sealing force as a result of setting is significantly reduced. In contrast to the embodiment according to Fig.1 is used for injector clamping after Fig.2 A sleeve 12 is installed between the screw head collar 17 and the clamping claw 1. The screw 7 is designed as an expansion screw 7 with a reduced shaft diameter. The greatly increased screw length and the reduced shaft diameter of the expansion screw 7 due to the sleeve 12 significantly increase the elasticity of the screw assembly. A further contribution to the increase in elasticity is achieved by the sleeve 12 itself. The result is a greatly increased overall elasticity in the screw assembly, which significantly reduces the loss of preload force in the event of settling.

Fig. 2 zeigt eine Einspritzinjektorverpratzung, die mit einer Pratze 1 einen Injektor 3 an einem Zylinderkopf einer Dieselbrennkraftmaschine befestigt. Fig.2 shows an injection injector clamp which uses a clamp 1 to fasten an injector 3 to a cylinder head of a diesel internal combustion engine.

Dabei stützt die Spannpratze 1 mit einem Ende auf einer Auflagefläche 2 am Injektor 3 ab, während das zweite Ende am Zylinderkopf 4 auf einer Fläche 5 zur Auflage kommt. Eine zwischen beiden Enden angeordnete Schraube 7 drückt die Pratze 1 mittels einer Hülse 12, die zwischen Pratzenschraube 7 und Spannpratze 1 konzentrisch um die Pratzenschraube 7 angeordnet ist, gegen die Auflageflächen 2 und 5, woraus am Injektor die zur Abdichtung axiale Druckkraft resultiert und den Injektor 3 in der Aufnahmebohrung 9 fixiert. Die Pratzenschraube 7 wird als Dehnschraube mit reduziertem Schaftdurchmesser ausgeführt. Die Hülse 12 hat an der Unterseite eine kegelige Fläche 18 zur Auflage auf der balligen Gegenfläche der Spannpratze 1. Auf der Oberseite hat die Hülse eine ebene Kontaktfläche 16 zum Schraubenkopfbund 17 hin, so dass die Kontaktfläche 16 senkrecht zur Schraubenachse angeordnet ist und planparallel am Schraubenkopfbund anliegt.The clamping claw 1 rests with one end on a support surface 2 on the injector 3, while the other end rests on a surface 5 on the cylinder head 4. A screw 7 arranged between the two ends presses the claw 1 against the support surfaces 2 and 5 by means of a sleeve 12 which is arranged concentrically around the claw screw 7 between the claw screw 7 and the clamping claw 1, which results in the axial compressive force on the injector for sealing and fixes the injector 3 in the receiving bore 9. The claw screw 7 is designed as an expansion screw with a reduced shaft diameter. The sleeve 12 has a conical surface 18 on the underside for resting on the spherical counter surface of the clamping claw 1. On the top side, the sleeve has a flat contact surface 16 towards the screw head collar 17, so that the contact surface 16 is arranged perpendicular to the screw axis and lies plane-parallel to the screw head collar.

Die Aufnahmebohrung 9 für den Injektor 3 wird in diesem Ausführungsbeispiel nur teilweise durch eine Bohrung im Zylinderkopf realisiert. Es gibt hier keine durchgängige Gusspfeife durch den Wassermantel. Stattdessen wird in eine Bohrung durch den Wassermantel eine Kupferhülse 10 verbaut, deren Innenraum die Aufnahmebohrung für den Injektor 3 bildet. In dieser Kupferhülse 10 kommt auch der Dichtring 11 des Injektors 3 zum Einsatz, welcher den Brennraum gegen den ringförmigen Kraftstoffraum zwischen Injektor 3 und Kupferhülse 10 abdichtet. Die Pratzenschraube 7 verfügt über drei Bünde 13, 14, 15 am Schaft. Der untere Bund 13 dient zur Zentrierung der Spannpratze 1. Der mittlere Bund 14 und der obere Bund 15 dienen zur Zentrierung der Hülse 12, womit ein stabiler Aufbau der Verbindung erreicht wird. Wegen der kegeligen Form der Hülse an der Kontaktfläche 18 zur Pratze 1 darf die Hülse 12 nicht falsch herum, das heißt mit der kegeligen Auflage 18 zum Schraubenkopf hin, eingebaut werden. Dazu wird die Bohrung der Hülse 12 gestuft ausgeführt. Der untere Teil 19 der Bohrung ist dabei im Durchmesser kleiner als der des mittleren Zentrierbundes 14 der Schraube 7. Wird die Hülse 12 falsch herum auf die Schraube 7 aufgesteckt, so lässt sich diese nur bis zum mittleren Bund 14 aufstecken. Die Position des mittleren Bundes 14 ist so gewählt, dass dabei das Gewinde der Schaube 7 nicht in die Gewindebohrung am Zylinderkopf 4 eingreifen kann, um eine Falschmontage zu verhindern.In this embodiment, the receiving bore 9 for the injector 3 is only partially realized by a bore in the cylinder head. There is no continuous cast pipe through the water jacket. Instead, a copper sleeve 10 is installed in a bore through the water jacket, the interior of which forms the receiving bore for the injector 3. The sealing ring 11 of the injector 3 is also used in this copper sleeve 10, which seals the combustion chamber against the annular fuel chamber between the injector 3 and the copper sleeve 10. The claw screw 7 has three collars 13, 14, 15 on the shaft. The lower collar 13 is used to center the clamping claw 1. The middle collar 14 and the upper collar 15 are used to center the sleeve 12, which ensures a stable structure of the connection. Because of the conical shape of the sleeve on the contact surface 18 to the claw 1, the sleeve 12 must not be installed the wrong way round, i.e. with the conical support 18 towards the screw head. For this purpose, the bore of the sleeve 12 is designed in stages. The lower part 19 of the bore is smaller in diameter than that of the middle centering collar 14 of the screw 7. If the sleeve 12 is put on the screw 7 the wrong way round, it can only be put on up to the middle collar 14. The position of the middle collar 14 is selected so that the thread the screw 7 cannot engage in the threaded hole on the cylinder head 4 in order to prevent incorrect assembly.

BezugszeichenlisteList of reference symbols

11
SpannpratzeClamping claw
22
Auflagefläche am InjektorSupport surface on the injector
33
Injektor zur KraftstoffeinspritzungInjector for fuel injection
44
ZylinderkopfCylinder head
55
Auflagefläche am ZylinderkopfSupport surface on the cylinder head
77
Pratzenschraube (Dehnschraube)Claw screw (expansion screw)
99
AufnahmebohrungMounting hole
1010
KupferhülseCopper sleeve
1111
Dichtring des InjektorsInjector sealing ring
1212
HülseSleeve
1313
unterer Bundlower waistband
1414
mittlerer Zentrierbundmiddle centering collar
1515
oberer Bundupper waistband
1616
ebene Kontaktflächeflat contact surface
1717
SchraubenkopfbundScrew head collar
1818
Kontaktfläche (keglige)Contact surface (conical)
1919
unterer Teil der Bohrunglower part of the hole

Claims (8)

  1. An internal combustion engine, in particular a diesel engine, in particular of a motor vehicle, the internal combustion engine comprising at least one working cylinder and
    a cylinder head (4) which seals the working cylinder, an injector (3) for fuel injection (3) for the working cylinder being arranged in the cylinder head,
    wherein a clamping claw (1) is provided for fixing the injector (3) for fuel injection in such a way that one end of the clamping claw clasps the injector (3) with two arms and,
    using contact surfaces (2), presses the injector (3), with sealing effect, against a seat or a seal (11) in the cylinder head (4),
    wherein the other end of the clamping claw (1) is supported on the cylinder head (4) on a contact surface (5),
    wherein the clamping force of the clamping claw (1) is applied using a claw bolt (7), which is designed as a through-bolt with a bolt head collar (17), and using a corresponding threading in the cylinder head (4),
    wherein the position of the claw bolt (7) is located between the contact surfaces (2) on the injector (3) and the contact surfaces (5) on the cylinder head (4),
    wherein a sleeve (12) is arranged between the bolt head collar (17) of the claw bolt (7) and the clamping claw (1),
    characterized in that
    the claw bolt (7) comprises a lower collar (13), a middle collar (14) and an upper collar (15) on a shaft, the lower collar (13) centering the clamping claw (1) and the middle collar (14) and the upper collar (15) centering the sleeve (12).
  2. The internal combustion engine according to claim 1,
    characterized in that
    the claw bolt (7) is an expansion bolt.
  3. The internal combustion engine according to claim 1 or 2,
    characterized in that
    the sleeve (12) is arranged concentrically about the claw bolt (7) between the bolt head collar (17) and the clamping claw (1).
  4. The internal combustion engine according to claim 2 or 3,
    characterized in that
    the expansion bolt is subject to a plastic deformation in the claw bolt-sleeve combination (7/12).
  5. The internal combustion engine according to one or more of the preceding claims,
    characterized in that
    the sleeve (12) has a conical surface (18) on its side facing the clamping claw (1), the conical surface resting on a convex mating surface on the clamping claw (1).
  6. The internal combustion engine according to one or more of the preceding claims,
    characterized in that
    the sleeve (12) has two different inner diameters in the form of a stepped bore.
  7. The internal combustion engine according to one or more of the preceding claims,
    characterized in that
    the position of the middle collar (14) on the shaft of the claw bolt (7) is selected such that the threading of the claw bolt (7) does not engage with the threading of the cylinder head (4) when the sleeve (12) is installed backward.
  8. A method for operating an internal combustion engine,
    characterized in that
    an internal combustion engine according to one or more of the preceding claims is being used.
EP21000191.3A 2020-07-30 2021-07-20 Injector clamp Active EP3945206B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102020004625.8A DE102020004625A1 (en) 2020-07-30 2020-07-30 injector spillage

Publications (2)

Publication Number Publication Date
EP3945206A1 EP3945206A1 (en) 2022-02-02
EP3945206B1 true EP3945206B1 (en) 2024-05-01

Family

ID=77155489

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21000191.3A Active EP3945206B1 (en) 2020-07-30 2021-07-20 Injector clamp

Country Status (4)

Country Link
US (1) US11603816B2 (en)
EP (1) EP3945206B1 (en)
CN (1) CN114060194A (en)
DE (1) DE102020004625A1 (en)

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* Cited by examiner, † Cited by third party
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US11608804B1 (en) * 2021-08-25 2023-03-21 Caterpillar Inc. Fuel injector having side-fitted fuel connector for tight packaging in top-feed fuel system
DE102022211054A1 (en) 2022-10-19 2024-04-25 Robert Bosch Gesellschaft mit beschränkter Haftung Fuel injector arrangement for mounting a fuel injector in an internal combustion engine

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US3924583A (en) * 1974-06-21 1975-12-09 Caterpillar Tractor Co Mounting apparatus
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DE19521363C1 (en) 1995-06-12 1996-09-05 Daimler Benz Ag Device to fasten holder for injection nozzle in engine cylinder head
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Also Published As

Publication number Publication date
DE102020004625A1 (en) 2022-02-03
CN114060194A (en) 2022-02-18
US20220034286A1 (en) 2022-02-03
EP3945206A1 (en) 2022-02-02
US11603816B2 (en) 2023-03-14

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