EP3945206A1 - Injector clamp - Google Patents

Injector clamp Download PDF

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Publication number
EP3945206A1
EP3945206A1 EP21000191.3A EP21000191A EP3945206A1 EP 3945206 A1 EP3945206 A1 EP 3945206A1 EP 21000191 A EP21000191 A EP 21000191A EP 3945206 A1 EP3945206 A1 EP 3945206A1
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EP
European Patent Office
Prior art keywords
screw
claw
injector
internal combustion
combustion engine
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.)
Granted
Application number
EP21000191.3A
Other languages
German (de)
French (fr)
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EP3945206B1 (en
Inventor
Samir Elfi
Martin Grawitter
Jens Wannhoff
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Deutz AG
Original Assignee
Deutz AG
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Filing date
Publication date
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Publication of EP3945206A1 publication Critical patent/EP3945206A1/en
Application granted granted Critical
Publication of EP3945206B1 publication Critical patent/EP3945206B1/en
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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
    • 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 brace with a claw screw on an internal combustion engine.
  • EP 2 113 654 B1 an assembly compound for attaching one or more injector holders to a cylinder head of an internal combustion engine.
  • DE 10340911 B4 shows such an injector sprawl on an internal combustion engine.
  • a device for attaching an injector holder on the cylinder head by means of a two-armed clamp and a clamping screw is, 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 injector of the internal combustion engine, since they cannot be assembled together due to their structurally predetermined shape. This prevents automatic assembly of the injector nozzle holder on the cylinder head.
  • the nozzle clamping device has contact parts which are seated on clamping receiving seats of the fuel injection nozzles. Between the contact portions, the nozzle clamp has a bolt insertion hole into which a clamp bolt is inserted to apply pressure against the fuel injectors and impart sealing loads.
  • the nozzle clamp includes clearance which reduces the compressive force on the fuel injectors so that at a predetermined level of bolt tightening force there is substantially equal compressive force on the three fuel injectors.
  • the nozzle clamp is made of a spring material such that the nozzle clamp is easily bent.
  • the object of the invention is to achieve the above To avoid disadvantages and an internal combustion engine of the o. Art to improve in terms of assembly and ease of maintenance, which at the same time increases the elasticity of the screw association.
  • In 1 shows an injection injector strut, which uses a claw 1 to fasten an injector 3 to a cylinder head of a diesel internal combustion engine.
  • a beam-like element supports the clamping claw 1 with it one end on a bearing surface 2 on the injector 3, while the second end on the cylinder head 4 comes to rest on a surface 5.
  • a screw 7 arranged between the two ends presses the claw 1 against the bearing surfaces, which results in the axial compressive 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 realized by a bore in the cylinder head.
  • a copper sleeve 10 is installed in a hole through the water jacket, the interior of which forms the mounting hole for the injector 3 .
  • the sealing ring 11 of the injector 3 also rests in this copper sleeve 10 and seals the combustion chamber from the annular fuel chamber between the injector 3 and the copper sleeve 10 .
  • the high level of compression on the sealing ring support on the copper sleeve side can lead to settling and, as a result, to a drop in the sealing force on the injector. The result is leaks.
  • a claw screw connection can be seen, which leads to 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 shank diameter.
  • the length of the screw, which is greatly increased by the sleeve 12, and the reduced shank diameter of the expansion screw 7 significantly increase the elasticity of the screw association.
  • 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 connection, which significantly reduces the loss of pre-tensioning force when there are signs of settling.
  • FIG. 1 shows an injection injector strut, which uses a claw 1 to fasten an injector 3 to a cylinder head of a diesel internal combustion engine.
  • the clamping claw 1 is supported with one end on a bearing surface 2 on the injector 3, while the second end on the cylinder head 4 comes to rest on a surface 5.
  • a screw 7 arranged between both ends presses the claw 1 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, against the bearing surfaces 2 and 5, which results in the axial compressive force on the injector for sealing and the injector 3 fixed in the mounting hole 9.
  • the claw screw 7 is designed as an expansion screw with a reduced shank diameter.
  • the sleeve 12 has a conical surface 18 on the underside to rest on the convex counter-surface of the clamping claw 1. On the upper 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 plane-parallel to the screw head collar applied.
  • the receiving bore 9 for the injector 3 is only partially realized by a bore in the cylinder head.
  • a copper sleeve 10 is installed in a hole through the water jacket, the interior of which forms the mounting hole 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, with which a stable construction of the connection is achieved.
  • the sleeve 12 Due to the conical shape of the sleeve at the contact surface 18 to the claw 1, the sleeve 12 must not be installed the wrong way round, ie with the conical support 18 facing the screw head.
  • the bore of the sleeve 12 is stepped.
  • the diameter of the lower part 19 of the hole is smaller than that of the centering collar 14 of the screw 7 .
  • the position of the central collar 14 is chosen so that the thread the screw 7 cannot engage in the threaded hole on the cylinder head 4 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)

Abstract

2. Beschrieben wird eine Brennkraftmaschine, insbesondere ein Dieselmotor, insbesondere eines Kraftfahrzeugs, mit wenigstens einem Arbeitszylinder und einem den Arbeitszylinder verschließenden Zylinderkopf (4), in dem für den Arbeitszylinder ein Injektor zur Kraftstoffeinspritzung (3) angeordnet ist, wobei für den Injektor zur Kraftstoffeinspritzung (3) eine Spannpratze (1) vorgesehen ist, deren eines Ende sich auf das andere Ende stützt, mit wenigstens zwei Armen derart vorgesehen ist, dass jeweils ein Arm der Spannpratze (1) auf einen Injektor zur (3) wirkt und der Injektor zur Kraftstoffeinspritzung (3) mit einer definierten Kraft gegen einen Sitz bzw. eine Dichtung (11) im Zylinderkopf (4) dichtend drückt, wobei eine als Durchsteckschraube ausgeführte Pratzenschraube (7) mit Schraubenkopfbund (17) und mit korrespondierendem Gewinde im Zylinderkopf (4) vorgesehen ist, welche die Spannpratze (1) am Zylinderkopf (4) befestigt, wobei die Arme der Spannpratze (1) derart ausgebildet sind, dass die Arme der Spannpratze (1) auf einer Auflagefläche (2) am Injektor (3) und auf einer Auflagefläche (5) am Zylinderkopf (4) zur Auflage kommen.2. Describes an internal combustion engine, in particular a diesel engine, in particular of a motor vehicle, with at least one working cylinder and a cylinder head (4) closing the working cylinder, in which an injector for fuel injection (3) is arranged for the working cylinder, the injector for fuel injection (3) a clamping claw (1) is provided, one end of which rests on the other end, is provided with at least two arms such that one arm of the clamping claw (1) acts on an injector for (3) and the injector for Fuel injection (3) presses with a defined force against a seat or a seal (11) in the cylinder head (4), with a claw screw (7) designed as a through-bolt with screw head collar (17) and with a corresponding thread being provided in the cylinder head (4). is which fastens the clamping claw (1) to the cylinder head (4), the arms of the clamping claw (1) being designed in this way that the arms of the clamping claw (1) come to rest on a bearing surface (2) on the injector (3) and on a bearing surface (5) on the cylinder head (4).

Description

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

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

Weiter offenbart die EP 2 113 654 B1 einen Montageverbund zum Befestigen eines oder mehrerer Einspritzdüsenhalter an einem Zylinderkopf einer Brennkraftmaschine.Next revealed the EP 2 113 654 B1 an assembly compound for attaching one or more injector 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 sprawl 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 attaching an injector holder on the cylinder head by means of a two-armed clamp and a clamping screw is, for example, from DE 195 21 363 C1 known. During assembly, however, 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 injector of the internal combustion engine, since they cannot be assembled together due to their structurally predetermined shape. This prevents automatic assembly of the injector nozzle 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 U.S. 7,334,572 B1 also discloses a system and method for securing a fuel injector in an internal combustion engine that includes a clamp for securing adjacent fuel injectors 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. In this case, the nozzle clamping device has contact parts which are seated on clamping receiving seats of the fuel injection nozzles. Between the contact portions, the nozzle clamp has a bolt insertion hole into which a clamp bolt is inserted to apply pressure against the fuel injectors and impart sealing loads. The nozzle clamp includes clearance which reduces the compressive force on the fuel injectors so that at a predetermined level of bolt tightening force there is substantially equal compressive force on the three fuel injectors. Alternatively, the nozzle clamp is made of a spring material such that the nozzle clamp is easily 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 des Schraubenverbandes erhöht.The object of the invention is to achieve the above To avoid disadvantages and an internal combustion engine of the o. Art to improve in terms of assembly and ease of maintenance, which at the same time increases the elasticity of the screw association.

Diese Aufgabe wird erfindungsgemäß durch eine Brennkraftmaschine der o. g. Art mit den in Anspruch 1 und 10 gekennzeichneten Merkmalen gelöst. Vorteilhafte Ausgestaltungen der Erfindung sind in den weiteren Ansprüchen beschrieben.According to the invention, this object is achieved by an internal combustion engine of the above-mentioned type. Art solved with the features characterized in claim 1 and 10. Advantageous configurations 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. Show in the drawing:
Figure 1:
an injector spillage according to the prior art,
Figure 2:
an injector spillage,
Figure 3:
the injector smearing off 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 1 shows an injection injector strut, which uses a claw 1 to fasten an injector 3 to a cylinder head of a diesel internal combustion engine. A beam-like element supports the clamping claw 1 with it one end on a bearing surface 2 on the injector 3, while the second end on the cylinder head 4 comes to rest on a surface 5. A screw 7 arranged between the two ends presses the claw 1 against the bearing surfaces, which results in the axial compressive 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 exemplary 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 here. Instead, a copper sleeve 10 is installed in a hole through the water jacket, the interior of which forms the mounting hole for the injector 3 . The sealing ring 11 of the injector 3 also rests in this copper sleeve 10 and seals the combustion chamber from the annular fuel chamber between the injector 3 and the copper sleeve 10 . The high level of compression on the sealing ring support on the copper sleeve side can lead to settling and, as a result, to 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 embodiment in the Figures 2 and 3 is shown, a claw screw connection can be seen, which leads to 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 1 is after the injector Verpratzung 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 shank diameter. The length of the screw, which is greatly increased by the sleeve 12, and the reduced shank diameter of the expansion screw 7 significantly increase the elasticity of the screw association. 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 connection, which significantly reduces the loss of pre-tensioning force when there are signs of settling.

Fig. 2 zeigt eine Einspritzinjektorverpratzung, die mit einer Pratze 1 einen Injektor 3 an einem Zylinderkopf einer Dieselbrennkraftmaschine befestigt. 2 FIG. 1 shows an injection injector strut, which uses a claw 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 is supported with one end on a bearing surface 2 on the injector 3, while the second end on the cylinder head 4 comes to rest on a surface 5. A screw 7 arranged between both ends presses the claw 1 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, against the bearing surfaces 2 and 5, which results in the axial compressive force on the injector for sealing and the injector 3 fixed in the mounting hole 9. The claw screw 7 is designed as an expansion screw with a reduced shank diameter. The sleeve 12 has a conical surface 18 on the underside to rest on the convex counter-surface of the clamping claw 1. On the upper 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 plane-parallel to the screw head collar applied.

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 exemplary 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 here. Instead, a copper sleeve 10 is installed in a hole through the water jacket, the interior of which forms the mounting hole 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, with which a stable construction of the connection is achieved. Due to the conical shape of the sleeve at the contact surface 18 to the claw 1, the sleeve 12 must not be installed the wrong way round, ie with the conical support 18 facing the screw head. For this purpose, the bore of the sleeve 12 is stepped. The diameter of the lower part 19 of the hole is smaller than that of the centering collar 14 of the screw 7 . The position of the central collar 14 is chosen so that the thread the screw 7 cannot engage in the threaded hole on the cylinder head 4 to prevent incorrect assembly.

BezugszeichenlisteReference List

11
Spannpratzeclamp
22
Auflagefläche am Injektorbearing surface on the injector
33
Injektor zur KraftstoffeinspritzungFuel injection injector
44
Zylinderkopfcylinder head
55
Auflagefläche am Zylinderkopfbearing 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 (9)

Brennkraftmaschine, insbesondere Dieselmotor, insbesondere eines Kraftfahrzeugs, mit wenigstens einem Arbeitszylinder und einem den Arbeitszylinder verschließenden Zylinderkopf (4), in dem für den Arbeitszylinder ein Injektor zur Kraftstoffeinspritzung (3) angeordnet ist, wobei für die Fixierung des Injektors zur Kraftstoffeinspritzung eine Spannpratze derart vorgesehen ist, dass deren eines Ende mit zwei Armen den Injektor umfasst und über Auflageflächen (2) den Injektor dichtend gegen einen Sitz bzw. eine Dichtung (11) im Zylinderkopf (4) drückt, wobei sich das andere Ende der Pratze (1) auf einer Auflagefläche (5) am Zylinderkopf abstützt, wobei die Spannkraft der Spannpratze (1) mittels einer als Durchsteckverschraubung ausgeführten Pratzenschraube (7) mit Schraubenkopfbund (17) und mit korrespondierendem Gewinde im Zylinderkopf (4) aufgebracht wird, wobei sich die Position der Schraube zwischen den Auflageflächen (2) am Injektor (3) und der Auflageflächen (5) am Zylinderkopf (4) befindet.Internal combustion engine, in particular diesel engine, in particular of a motor vehicle, with at least one working cylinder and a cylinder head (4) closing the working cylinder, in which an injector for fuel injection (3) is arranged for the working cylinder, a clamping claw being provided in this way for fixing the injector for fuel injection is that one end of which surrounds the injector with two arms and presses the injector sealingly against a seat or a seal (11) in the cylinder head (4) via bearing surfaces (2), the other end of the claw (1) resting on a bearing surface (5) on the cylinder head, with the clamping force of the clamping claw (1) being applied by means of a claw screw (7) designed as a through-bolt connection with a screw head collar (17) and with a corresponding thread in the cylinder head (4), with the position of the screw changing between the Support surfaces (2) on the injector (3) and the support surfaces (5) on the cylinder head (4) b finds. Brennkraftmaschine nach Anspruch 1,
dadurch gekennzeichnet, dass die Pratzenschraube (7) eine Dehnschraube ist.Internal combustion engine according to claim 1,
characterized in that the claw screw (7) is an expansion screw. Brennkraftmaschine nach Anspruch 1 oder 2,
dadurch gekennzeichnet, dass zwischen dem Schraubenkopfbund (17) und der Spannpratze (1) eine Hülse (12) konzentrisch um die Pratzenschraube (7) herum angeordnet ist.Internal combustion engine according to claim 1 or 2,
characterized in that a sleeve (12) is arranged concentrically around the claw screw (7) between the screw head collar (17) and the clamping claw (1). Brennkraftmaschine nach Anspruch 2 oder 3,
dadurch gekennzeichnet, dass bei der Pratzenschrauben-Hülsen-Kombination (7/12) die Dehnschraube einer plastischen Verformung unterliegt.Internal combustion engine according to claim 2 or 3,
characterized in that in the case of the claw screw-sleeve combination (7/12), the expansion screw is subject to plastic deformation. Brennkraftmaschine nach einem oder mehreren der vorgenannten Ansprüche,
dadurch gekennzeichnet, dass die Pratzenschraube (7) drei Bünde (13, 14, 15) am Schaft aufweist. Der untere Bund 13 zentriert Spannpratze 1, Bund 14 und 15 zentrieren Hülse 18.Internal combustion engine according to one or more of the preceding claims,
characterized in that the claw screw (7) has three collars (13, 14, 15) on the shaft. The lower collar 13 centers clamping claw 1, collars 14 and 15 center sleeve 18. Brennkraftmaschine nach einem oder mehreren der vorgenannten Ansprüche,
dadurch gekennzeichnet, dass die Hülse (12) an ihrer der Spannpratze (1) zugewandten Seite eine kegelige Fläche (18) aufweist, welche auf eine ballige Gegenfläche an der Spannpratze zur Anlage kommt.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), which comes to rest on a crowned mating surface on the clamping claw. Brennkraftmaschine nach einem oder mehreren der vorgenannten Ansprüche,
dadurch gekennzeichnet, dass die Hülse (12) zwei unterschiedliche Innendurchmesser in Form einer gestuften Bohrung aufweist.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. Brennkraftmaschine nach einem oder mehreren der vorgenannten Ansprüche,
dadurch gekennzeichnet, dass die Position des mittleren Bundes 14 am Schaft der Pratzenschraube 7 derart gewählt ist, dass das Gewinde der Schraube nicht am Gewinde des Zylinderkopfes greift, wenn Hülse 12 falsch herum montiert wird.Internal combustion engine according to one or more of the preceding claims,
characterized in that the position of the central collar 14 on the shank of the claw screw 7 is chosen such that the thread of the screw does not engage the thread of the cylinder head when the sleeve 12 is fitted the wrong way around. Verfahren zum Betreiben einer Brennkraftmaschine,
dadurch gekennzeichnet, dass eine Brennkraftmaschine nach einem oder mehreren der vorgenannten Ansprüche zum Einsatz kommt.Method for operating an internal combustion engine,
characterized in that an internal combustion engine according to one or more of the preceding claims is 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

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

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ID=77155489

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EP21000191.3A Active EP3945206B1 (en) 2020-07-30 2021-07-20 Injector clamp

Country Status (4)

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

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CN114060194A (en) 2022-02-18
DE102020004625A1 (en) 2022-02-03
US11603816B2 (en) 2023-03-14
EP3945206B1 (en) 2024-05-01
US20220034286A1 (en) 2022-02-03

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