EP0152763A1 - Shell sealing for separating a cylindrical body from a bore containing the same - Google Patents

Shell sealing for separating a cylindrical body from a bore containing the same Download PDF

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Publication number
EP0152763A1
EP0152763A1 EP85100419A EP85100419A EP0152763A1 EP 0152763 A1 EP0152763 A1 EP 0152763A1 EP 85100419 A EP85100419 A EP 85100419A EP 85100419 A EP85100419 A EP 85100419A EP 0152763 A1 EP0152763 A1 EP 0152763A1
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EP
European Patent Office
Prior art keywords
seal
injection nozzle
bore
fuel injection
diameter portion
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
EP85100419A
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German (de)
French (fr)
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EP0152763B1 (en
Inventor
Herbert Joseph Hauser, Jr.
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.)
Deere and Co
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Deere and Co
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Publication date
Application filed by Deere and Co filed Critical Deere and Co
Priority to AT85100419T priority Critical patent/ATE29557T1/en
Publication of EP0152763A1 publication Critical patent/EP0152763A1/en
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Publication of EP0152763B1 publication Critical patent/EP0152763B1/en
Expired legal-status Critical Current

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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
    • F02M61/167—Means for compensating clearance or thermal expansion
    • 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
    • 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 a bushing seal for separating a cylindrical body from a bore having an upper and a lower end, the upper end abutting against the cylindrical body in a region outside the bore and the lower end being chamfered.
  • bush seals can be used in many areas.
  • a preferred area of application is that of internal combustion engines, where it is important to prevent the high-temperature gases which arise in the cylinder bore during the working cycles from sweeping past the lower part of the injection nozzle into its upper region and causing heat and charring problems there.
  • the bush seal (US Pat. No. 4,201,172) from which the invention is based is also intended to solve this problem.
  • the gasket is designed such that it surrounds a part of the injection nozzle and at its upper end it runs out into an annular flange which is pressed onto the cylinder head via a cover.
  • an annular groove is incorporated into the nozzle body with the smaller diameter, in which the bushing seal is inserted.
  • the bushing seal is fixed in the injection nozzle and is intended to have a heat-insulating effect, which is why it can be made of heat-resistant rubber.
  • the shape of the bush seal determines the depth of use of the nozzle and, due to the compression of the ring flange, stresses can occur in this area during relative movements between the nozzle and the cylinder head. which lead to premature signs of fatigue, which reduces the effectiveness of the seal and gases can escape from the cylinder liner past the nozzle.
  • the object to be achieved with the invention is seen in the fact that the ends of the bushing seal can be moved axially relative to one another and from one another.
  • the seal has a bellows-shaped part between its upper end and the beginning of the bevel and at least at the beginning of the bevel has a larger diameter than the bore.
  • the seal can easily adapt to different depths of use of the cylindrical body and relative movements between the body and the bore, since the bellows-shaped part allows it to be pushed together and pulled apart and the choice of diameter at the beginning of the bevel ensures that the seal between the body and the bore is held securely.
  • the bellows-shaped part can expediently be provided approximately centrally between the upper and lower ends of the seal, the bellows-shaped part being semicircular in cross section.
  • an internal combustion engine 10 is shown in extracts.
  • Your engine block is 12
  • an associated cylinder bore is 14
  • a cylinder head which is fixed in the usual way on the engine block 12 and closes the cylinder bore 14 at one end, is designated 16.
  • a stepped through hole 18 is machined, which consists in detail of a bore 20 with a smaller diameter, which opens into the cylinder bore 14, and a bore 22 with a larger diameter, which is located away from the cylinder bore 14.
  • An injection nozzle 24 is inserted in the through hole 18 and screwed to the cylinder head 14 via a thread 26.
  • the thread 26 makes it possible for the injection nozzle 24 to be axially adjustable. Of course, other adjusting means can be used instead of the thread 26.
  • the injection nozzle 24 is also of a stepped design and accordingly consists of a cylindrical body 30 with a smaller diameter than a further section 32 with a larger circumference. At the transition from the smaller body 30 to the section 32, a shoulder 28 is formed and the body 30 has a diameter that is a few thousandths smaller than the diameter of the bore 20.
  • combustion results in gases in the cylinder bore 14 which tend to flow upward through the bore 20 into the bore 22, which is harmful since this causes the injector 24 to heat up and charring problems can occur.
  • gases flow into the bore 22 with the larger diameter, there is a dead volume of air, which creates a so-called for subsequent work cycles.
  • the combined effect of the heated injection nozzle 24, the quenching of the dead air volume and the carbonization deteriorates the efficiency of the internal combustion engine 10 and increases the emissivity.
  • a bushing seal 34 is used. It can best be seen in FIGS. 2 and 3 and has the shape of a hollow sleeve-shaped ring 36 which encircles the cylindrical body 30 of the injection nozzle 24 and lies against it.
  • the ring 36 has a flat upper end 38 that abuts the shoulder 28 and a tapered or tapered lower end 40 that at least partially abuts the inner wall of the bore 20 with the smaller diameter.
  • the bevel is provided on the outside of the ring with a maximum outer diameter that is slightly larger than the diameter of the bore 20. The smallest diameter of the bevel is slightly smaller than the inner diameter of the bore.
  • the bevel can be of different angle sizes.
  • the angle can be 10 to 4S 0 , preferably 30 ° measured from the outer surface of the ring 36.
  • the bushing seal 34 is also provided with an outwardly projecting bellows-shaped part 42, which in principle can be provided anywhere between the upper and lower ends 38 and 40, approximately centrally between the ends or preferably midway between the top end and the beginning 44 of the bevel.
  • the bellows-shaped portion 42 is compressible and extensible, thereby allowing the two ends 38 and 40 to move axially relative to each other when the injector 24 is inserted into the cylinder head 16 or during thermal expansion that occurs during normal operation of the internal combustion engine occurs.
  • a bush seal 34 with a total height of 6 mm should be able to be compressed by a maximum of 2.5 mm.
  • the bush seal should have a constant wall thickness over its entire length, that is between the upper end and the beginning 44 of the bevel. This also allows a simple and economical way of producing the bush seal. From Fig. 2 it can be seen that the cross section of the bellows-shaped part 42 is semicircular. Although the semicircular configuration is easy to manufacture, other cross-sectional shapes can of course also be used.
  • the bushing seal is made of a metallic material, it can act as a heat seal by preventing gases from entering the dead space in the bore 22.
  • the metallic material can also be replaced by heat-resistant rubber or plastic. The only decisive factor is that the material withstands the normal temperature range of the internal combustion engine, which is between 300 ° and 600 ° Farenheit.
  • the application of the bush seal is not limited to the use in internal combustion engines. It can be used wherever similar conditions occur with parts moving against each other.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Gasket Seals (AREA)
  • Glass Compositions (AREA)
  • Sealing Devices (AREA)
  • Sealing Material Composition (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Sealing With Elastic Sealing Lips (AREA)

Abstract

A seal for an internal combustion engine having a fuel injection nozzle positioned within a stepped bore formed in a cylinder head. The fuel injection nozzle contains an exterior stepped configuration with a shoulder formed between its steps. The seal includes a ring circumferentially positioned around and contacting the smaller diameter portion of the fuel injection nozzle. The ring has a flat first end which abuts the shoulder of the fuel injection nozzle and a tapered second end which contacts the smaller diameter portion of the stepped bore. The taper is formed on an exterior surface of the ring and has a maximum outside diameter which is slightly larger than the smaller diameter portion of the stepped bore. The seal also contains an outwardly projecting bulge formed between the first and second ends. The bulge permits the first and second ends to move axially relative to one another as the fuel injection nozzle is axially adjusted within the cylinder head and during normal engine operation. The seal serves to prevent combustion gases, which are generated in the cylinder, from flowing into the larger diameter portion of the stepped bore.

Description

Die Erfindung bezieht sich auf eine Buchsdichtung zum Trennen eines zylindrischen Körpers von einer ihn aufnehmenden Bohrung mit einem oberen und einem unteren Ende, wobei das obere Ende gegen den zylindrischen Körper in einem Bereich außerhalb der Bohrung anliegt und das untere Ende abgeschrägt ist.The invention relates to a bushing seal for separating a cylindrical body from a bore having an upper and a lower end, the upper end abutting against the cylindrical body in a region outside the bore and the lower end being chamfered.

Derartige Buchsdichtungen können in vielen Bereichen eingesetzt werden. Ein bevorzugtes Einsatzgebiet ist das der Verbrennungsmotoren, wo es gilt zu verhindern, daß die während der Arbeitsspiele in der Zylinderbohrung entstehenden Gase hoher Temperatur an dem unteren Teil der Einspritzdüse vorbei bis in deren oberen Bereich streichen und dort Hitze- und Verkohlungsprobleme hervorrufen.Such bush seals can be used in many areas. A preferred area of application is that of internal combustion engines, where it is important to prevent the high-temperature gases which arise in the cylinder bore during the working cycles from sweeping past the lower part of the injection nozzle into its upper region and causing heat and charring problems there.

Auch die Buchsdichtung (US-A-4 201 172), von der die Erfindung ausgeht, soll diese Problematik lösen. Im einzelnen ist die Dichtung derart ausgebildet, daß sie einen Teil der Einspritzdüse umgibt und an ihrem oberen Ende in einen ringförmigen Flansch ausläuft, der über einen Deckel auf den Zylinderkopf gepreßt wird. Außerdem ist in den Düsenkörper mit dem kleineren Durchmesser noch eine Ringnut eingearbeitet, in die die Buchsdichtung eingesetzt ist.The bush seal (US Pat. No. 4,201,172) from which the invention is based is also intended to solve this problem. In particular, the gasket is designed such that it surrounds a part of the injection nozzle and at its upper end it runs out into an annular flange which is pressed onto the cylinder head via a cover. In addition, an annular groove is incorporated into the nozzle body with the smaller diameter, in which the bushing seal is inserted.

Auf diese Weise ist die Buchsdichtung in der Einspritzdüse festgelegt und soll hitzeisolierend wirken, weshalb sie aus hitzebeständigem Gummi ausgebildet sein kann. Durch die Form der Buchsdichtung ist die Einsatztiefe der Düse vorgegeben und infolge der Pressung des Ringflansches können in diesem Bereich bei Relativbewegungen zwischen Düse und Zylinderkopf Spannungen auftreten, die zu vorzeitigen Ermüdungserscheinungen führen, wodurch die Wirksamkeit der Dichtung verringert wird und Gase aus der Zylinderbuchse an der Düse vorbei austreten können.In this way, the bushing seal is fixed in the injection nozzle and is intended to have a heat-insulating effect, which is why it can be made of heat-resistant rubber. The shape of the bush seal determines the depth of use of the nozzle and, due to the compression of the ring flange, stresses can occur in this area during relative movements between the nozzle and the cylinder head. which lead to premature signs of fatigue, which reduces the effectiveness of the seal and gases can escape from the cylinder liner past the nozzle.

Die mit der Erfindung zu lösende Aufgabe wird darin gesehen, daß die Enden der Buchsdichtung axial zueinander und voneinander bewegbar sind.The object to be achieved with the invention is seen in the fact that the ends of the bushing seal can be moved axially relative to one another and from one another.

Diese Aufgabe ist nach der Erfindung dadurch gelöst worden, daß die Dichtung zwischen ihrem oberen Ende und dem Anfang der Abschrägung einen balgförmigen Teil und zumindest am Anfang der Abschrägung einen größeren Durchmesser als die Bohrung aufweist. Auf diese Weise kann sich die Dichtung unterschiedlichen Einsatztiefen des zylindrischen Körpers und Relativbewegungen zwischen Körper und Bohrung leicht anpassen, da der balgförmige Teil ein Zusammenschieben und Auseinanderziehen zuläßt und die Durchmesserwahl am Anfang der Abschrägung ein sicheres Halten der Dichtung zwischen Körper und Bohrung gewährleistet. Bei einem Einsatz in einem Verbrennungsmotor wird dadurch mit Sicherheit vermieden, daß auch bei längerer Einsatzzeit keine Gase aus dem Brennraum entweichen können.This object has been achieved according to the invention in that the seal has a bellows-shaped part between its upper end and the beginning of the bevel and at least at the beginning of the bevel has a larger diameter than the bore. In this way, the seal can easily adapt to different depths of use of the cylindrical body and relative movements between the body and the bore, since the bellows-shaped part allows it to be pushed together and pulled apart and the choice of diameter at the beginning of the bevel ensures that the seal between the body and the bore is held securely. When used in an internal combustion engine, it is avoided with certainty that no gases can escape from the combustion chamber even after a long period of use.

Für eine Buchsdichtung, bei der der zylindrische Körper als Düse mit unterschiedlichen Außendurchmessern ausgebildet ist, so daß eine radiale Schulter entsteht, gegen die das obere Ende der Dichtung anliegt, wird nach der Erfindung ferner vorgeschlagen, daß die Dichtung zwischen dem oberen Ende und dem Anfang der Abschrägung eine gleiche Wandstärke aufweist.For a bush seal, in which the cylindrical body is designed as a nozzle with different outer diameters, so that a radial shoulder against which the upper end of the seal rests, it is further proposed according to the invention that the seal between the upper end and the beginning the bevel has the same wall thickness.

Zweckmäßig kann der balgförmige Teil etwa mittig zwischen dem oberen und unteren Ende der Dichtung vorgesehen sein, wobei der balgförmige Teil im Querschnitt halbkreisförmig ausgebildet ist.The bellows-shaped part can expediently be provided approximately centrally between the upper and lower ends of the seal, the bellows-shaped part being semicircular in cross section.

In der Zeichnung ist ein nachfolgend näher erläutertes Ausführungsbeispiel der Erfindung dargestellt. Es zeigt:

  • Fig. 1 eine in einen Zylinderkopf eingesetzte Einspritzdüse für Brennstoff mit einer Buchsdichtung im Querschnitt;
  • Fig. 2 die Buchsdichtung im größeren Maßstab;
  • Fig. 3 die Buchsdichtung in perspektivischer Darstellung.
In the drawing, an embodiment of the invention explained in more detail below is shown. It shows:
  • 1 shows an injection nozzle for fuel inserted into a cylinder head with a bushing seal in cross section;
  • Figure 2 shows the bush seal on a larger scale.
  • Fig. 3 shows the bush seal in perspective.

In Fig. 1 der Zeichnung ist eine Verbrennungsmaschine 10 auszugsweise wiedergegeben. Ihr Motorblock ist mit 12, eine zugehörige Zylinderbohrung ist mit 14 und ein Zylinderkopf, der in üblicher Weise auf dem Motorblock 12 befestigt ist und die Zylinderbohrung 14 einenends verschließt, ist mit 16 bezeichnet. In den Zylinderkopf 16 ist eine abgesetzte Durchgangsbohrung 18 eingearbeitet, die im einzelnen aus einer Bohrung 20 mit kleinerem Durchmesser, die in die Zylinderbohrung 14 mündet, und einer Bohrung 22 mit größerem Durchmesser besteht, die von der Zylinderbohrung 14 entfernt liegt. Eine Einspritzdüse 24 ist in der Durchgangsbohrung 18 eingesetzt und über ein Gewinde 26 mit dem Zylinderkopf 14 verschraubt. Das Gewinde 26 macht es möglich, daß die Einspritzdüse 24 axial verstellt werden kann. Selbstverständlich können anstelle des Gewindes 26 andere Einstellmittel verwendet werden. Auch die Einspritzdüse 24 ist abgesetzt ausgebildet und besteht demnach aus einem zylindrischen Körper 30 mit kleinerem Durchmesser als ein weiterer Abschnitt 32 mit größerem Umfang. An dem Übergang von dem kleineren Körper 30 zu dem Abschnitt 32 entsteht eine Schulter 28 und der Körper 30 hat einen Durchmesser, der einige Tausendstel kleiner ist, als der Durchmesser der Bohrung 20.1 of the drawing, an internal combustion engine 10 is shown in extracts. Your engine block is 12, an associated cylinder bore is 14 and a cylinder head, which is fixed in the usual way on the engine block 12 and closes the cylinder bore 14 at one end, is designated 16. In the cylinder head 16, a stepped through hole 18 is machined, which consists in detail of a bore 20 with a smaller diameter, which opens into the cylinder bore 14, and a bore 22 with a larger diameter, which is located away from the cylinder bore 14. An injection nozzle 24 is inserted in the through hole 18 and screwed to the cylinder head 14 via a thread 26. The thread 26 makes it possible for the injection nozzle 24 to be axially adjustable. Of course, other adjusting means can be used instead of the thread 26. The injection nozzle 24 is also of a stepped design and accordingly consists of a cylindrical body 30 with a smaller diameter than a further section 32 with a larger circumference. At the transition from the smaller body 30 to the section 32, a shoulder 28 is formed and the body 30 has a diameter that is a few thousandths smaller than the diameter of the bore 20.

Während des Einsatzes der Verbrennungsmaschine 10 entstehen infolge der Verbrennung Gase in der Zylinderbohrung 14, die dazu tendieren, durch die Bohrung 20 in die Bohrung 22 nach oben zu strömen, was schädlich ist, da dadurch die Einspritzdüse 24 sich aufheizt und Verkohlungsprobleme auftreten können. Hinzu kommt, daß, wenn die Gase in die Bohrung 22 mit dem größeren Durchmesser strömen, ein Totvolumen von Luft vorhanden ist, wodurch eine sogenannte für nachfolgende Arbeitsspiele entsteht. Durch die Kombinationswirkung von aufgeheizter Einspritzdüse 24, der Abschreckung des Lufttotvolumens und der Verkohlung wird der Leistungsgrad der Verbrennungsmaschine 10 verschlechtert und der Emissionsgrad erhöht.During use of the internal combustion engine 10, combustion results in gases in the cylinder bore 14 which tend to flow upward through the bore 20 into the bore 22, which is harmful since this causes the injector 24 to heat up and charring problems can occur. In addition, when the gases flow into the bore 22 with the larger diameter, there is a dead volume of air, which creates a so-called for subsequent work cycles. The combined effect of the heated injection nozzle 24, the quenching of the dead air volume and the carbonization deteriorates the efficiency of the internal combustion engine 10 and increases the emissivity.

Um zu verhindern, daß die Gase in die Bohrung 22 mit dem größeren Durchmesser eintreten, wird eine Buchsdichtung 34 eingesetzt. Sie ist am besten in den Fig. 2 und 3 zu erkennen und hat die Form eines hohlen hülsenförmigen Ringes 36, der den zylindrischen Körper 30 der Einspritzdüse 24 umfangsmäßig umfaßt und gegen diesen anliegt. Der Ring 36 hat ein flaches oberes Ende 38, das gegen die Schulter 28 anliegt, und ein abgeschrägtes oder kegeliges unteres Ende 40, das zumindest teilweise gegen die Innenwandung der Bohrung 20 mit dem kleineren Durchmesser anliegt. Die Abschrägung ist an der Außenseite des Ringes vorgesehen mit einem maximalen Außendurchmesser, der etwas größer ist, als der Durchmesser der Bohrung 20. Der kleinste Durchmesser der Abschrägung ist etwas kleiner als der Innendurchmesser der Bohrung.In order to prevent the gases from entering the bore 22 with the larger diameter, a bushing seal 34 is used. It can best be seen in FIGS. 2 and 3 and has the shape of a hollow sleeve-shaped ring 36 which encircles the cylindrical body 30 of the injection nozzle 24 and lies against it. The ring 36 has a flat upper end 38 that abuts the shoulder 28 and a tapered or tapered lower end 40 that at least partially abuts the inner wall of the bore 20 with the smaller diameter. The bevel is provided on the outside of the ring with a maximum outer diameter that is slightly larger than the diameter of the bore 20. The smallest diameter of the bevel is slightly smaller than the inner diameter of the bore.

Die Abschrägung kann verschiedene Winkelgrößen betragen. Im bevorzugten Ausführungsbeispiel kann der Winkel 10 bis 4S0 betragen, vorzugsweise 30° gemessen von der äußeren Oberfläche des Ringes 36.The bevel can be of different angle sizes. In the preferred embodiment, the angle can be 10 to 4S 0 , preferably 30 ° measured from the outer surface of the ring 36.

Die Buchsdichtung 34 ist außerdem noch mit einem nach außen vorstehenden balgförmigen Teil 42 versehen, der im Prinzip irgendwo zwischen dem oberen und unteren Ende 38 und 40 vorgesehen werden kann, etwa mittig zwischen den Enden oder vorzugsweise mittig zwischen dem oberen Ende und dem Anfang 44 der Abschrägung. Der balgförmige Teil 42 ist zusammendrück- und ausziehbar und ermöglicht damit, daß sich die beiden Enden 38 und 40 axial relativ zueinander bewegen können, wenn die Einspritzdüse 24 in den Zylinderkopf 16 eingesetzt wird oder auch während einer thermischen Expansion, die beim normalen Betrieb der Verbrennungsmaschine auftritt. So soll beispielsweise eine Buchsdichtung 34 von einer Gesamthöhe von 6mn in der Lage sein, um maximal 2,5 mm zusammengedrückt zu werden. Gleichfalls sollte die Buchsdichtung auf ihrer gesamten Länge, das heißt zwischen dem oberen Ende und dem Anfang 44 der Abschrägung, eine konstante Wandstärke aufweisen. Dies erlaubt auch eine einfache und wirtschaftliche Herstellungsweise der Buchsdichtung. Aus Fig. 2 ist zu erkennen, daß der Querschnitt des balgförmigen Teils 42 halbkreisförmig ist. Obwohl die halbkreisförmige Ausbildung leicht herzustellen ist, können natürlich auch andere Querschnittsformen Verwendung finden.The bushing seal 34 is also provided with an outwardly projecting bellows-shaped part 42, which in principle can be provided anywhere between the upper and lower ends 38 and 40, approximately centrally between the ends or preferably midway between the top end and the beginning 44 of the bevel. The bellows-shaped portion 42 is compressible and extensible, thereby allowing the two ends 38 and 40 to move axially relative to each other when the injector 24 is inserted into the cylinder head 16 or during thermal expansion that occurs during normal operation of the internal combustion engine occurs. For example, a bush seal 34 with a total height of 6 mm should be able to be compressed by a maximum of 2.5 mm. Likewise, the bush seal should have a constant wall thickness over its entire length, that is between the upper end and the beginning 44 of the bevel. This also allows a simple and economical way of producing the bush seal. From Fig. 2 it can be seen that the cross section of the bellows-shaped part 42 is semicircular. Although the semicircular configuration is easy to manufacture, other cross-sectional shapes can of course also be used.

Beim anfänglichen Einsetzen der Einspritzdüse 24 in die Durchgangsbohrung 18 ist es wahrscheinlich, daß die Schulter 28 mit der in Fig. 1 strichpunktiert gezeichneten Linie 46 zur Deckung kommt. Beim Feineinstellen der Einspritzdüse wird die Schulter 28 nach unten in Richtung auf die Zylinderbohrung 14 wandern. Während des Betriebes der Verbrennungsmaschine wird die Schulter 28 zwischen den Linien 46 und 48 auf und nieder wandern, und zwar infolge der thermischen Expansion und Kontraktion der zusammengebauten Teile und infolge der Spannungen, die sich im Zylinderkopf 16 bilden. Die Buchsdichtung 34 läßt diese Dimensionsänderungen zu, da sie zusammendrückbar ist, wenn sich die Einspritzdüse nach unten in Richtung auf die Zylinderbohrung 14 bewegt, und auseinanderziehbar auf ihre normale Länge ist, wenn die Einspritzdüse in ihre Ausgangsposition zurückkehrt. Unter normalem Einsatzverhältnissen, wird die Buchsdichtung verhindern, daß die Gase in die Bohrung 22 mit dem größeren Durchmesser der Durchgangsbohrung 18 eintreten. Obwohl die Buchsdichtung aus metallischem Werkstoff hergestellt ist, kann sie als Hitzedichtung wirken, indem sie verhindert, daß Gase in den Lufttotraum in der Bohrung 22 gelangen. Der metallische Werkstoff kann aber auch durch hitzebeständiges Gummi oder Plastik ersetzt werden. Ausschlaggebend ist nur, daß das Material dem normalen Temperaturbereich der Verbrennungsmaschine, der zwischen 300° bis 600° Farenheit liegt, standhält.When the injection nozzle 24 is initially inserted into the through hole 18, it is likely that the shoulder 28 will overlap with the line 46 drawn in broken lines in FIG. 1. When the injection nozzle is fine-tuned, the shoulder 28 will move downward in the direction of the cylinder bore 14. During operation of the internal combustion engine, shoulder 28 will move up and down between lines 46 and 48 due to the thermal expansion and contraction of the assembled parts and due to the stresses that form in cylinder head 16. The bushing 34 permits these dimensional changes because it is compressible when the injector moves down towards the cylinder bore 14 and is extensible to its normal length when the injector returns to its original position. Under normal operating conditions, the bush seal is ver prevent the gases from entering the bore 22 with the larger diameter of the through bore 18. Although the bushing seal is made of a metallic material, it can act as a heat seal by preventing gases from entering the dead space in the bore 22. The metallic material can also be replaced by heat-resistant rubber or plastic. The only decisive factor is that the material withstands the normal temperature range of the internal combustion engine, which is between 300 ° and 600 ° Farenheit.

Die Anwendung der Buchsdichtung ist nicht auf den Einsatz bei Verbrennungsmaschinen beschränkt. Sie kann überall dort eingesetzt werden, wo ähnliche Bedingungen bei sich gegeneinander bewegenden Teilen auftreten.The application of the bush seal is not limited to the use in internal combustion engines. It can be used wherever similar conditions occur with parts moving against each other.

Claims (4)

1. Buchsdichtung (34) zum Trennen eines zylindrischen Körpers (30) von einer ihn aufnehmenden Bohrung (20) mit einem oberen und einem unteren Ende (38, 40), wobei das obere Ende (38) gegen den zylindrischen Körper (30) in einem Bereich außerhalb der Bohrung (20) anliegt und das untere Ende abgeschrägt ist, dadurch gekennzeichnet, daß die Dichtung zwischen ihrem oberen Ende (38) und dem Anfang (44) der Abschrägung einen balgförmigen Teil (42) und zumindest am Anfang (44) der Abschrägung einen größeren Durchmesser als die Bohrung (20) aufweist.1. bush seal (34) for separating a cylindrical body (30) from a receiving bore (20) with an upper and a lower end (38, 40), the upper end (38) against the cylindrical body (30) in abuts an area outside the bore (20) and the lower end is chamfered, characterized in that the seal between its upper end (38) and the beginning (44) of the chamfer has a bellows-shaped part (42) and at least at the beginning (44) the bevel has a larger diameter than the bore (20). 2. Buchsdichtung (34) nach Anspruch 1, wobei der zylindrische Körper (30) als Düse mit unterschiedlichen Außendurchmessern ausgebildet ist, so daß eine radiale Schulter (28) entsteht, gegen die das obere Ende (38) der Dichtung (34) anliegt, dadurch gekennzeichnet, daß die Dichtung (34) zwischen dem oberen Ende (38) und dem Anfang (44) der Abschrägung eine gleiche Wandstärke aufweist.2. bushing seal (34) according to claim 1, wherein the cylindrical body (30) is designed as a nozzle with different outer diameters, so that a radial shoulder (28) is formed, against which the upper end (38) of the seal (34) rests, characterized in that the seal (34) has an equal wall thickness between the upper end (38) and the beginning (44) of the bevel. 3. Buchsdichtung (34) nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der balgförmige Teil (42) etwa mittig zwischen dem oberen und unteren Ende (38, 40) der Dichtung (34) vorgesehen ist.3. bush seal (34) according to claim 1 or 2, characterized in that the bellows-shaped part (42) is provided approximately centrally between the upper and lower ends (38, 40) of the seal (34). 4. Buchsdichtung (34) nach einem oder mehreren der vorherigen Ansprüche, dadurch gekennzeichnet, daß der balgförmige Teil (42) im Querschnitt halbkreisförmig ausgebildet ist.4. bush seal (34) according to one or more of the preceding claims, characterized in that the bellows-shaped part (42) is semicircular in cross section.
EP85100419A 1984-01-23 1985-01-17 Shell sealing for separating a cylindrical body from a bore containing the same Expired EP0152763B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85100419T ATE29557T1 (en) 1984-01-23 1985-01-17 BOOK SEAL FOR DISCONNECTING A CYLINDRICAL BODY FROM A HOLE RECEIVING IT.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US06/573,236 US4528959A (en) 1984-01-23 1984-01-23 Seal for an internal combustion engine
US573236 1984-01-23

Publications (2)

Publication Number Publication Date
EP0152763A1 true EP0152763A1 (en) 1985-08-28
EP0152763B1 EP0152763B1 (en) 1987-09-09

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Application Number Title Priority Date Filing Date
EP85100419A Expired EP0152763B1 (en) 1984-01-23 1985-01-17 Shell sealing for separating a cylindrical body from a bore containing the same

Country Status (10)

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US (1) US4528959A (en)
EP (1) EP0152763B1 (en)
JP (1) JPS60159365A (en)
AT (1) ATE29557T1 (en)
AU (1) AU562899B2 (en)
BR (1) BR8500236A (en)
CA (1) CA1221886A (en)
DE (1) DE3560602D1 (en)
ES (1) ES292800Y (en)
ZA (1) ZA85495B (en)

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Also Published As

Publication number Publication date
ZA85495B (en) 1986-09-24
ES292800U (en) 1986-06-16
CA1221886A (en) 1987-05-19
EP0152763B1 (en) 1987-09-09
AU562899B2 (en) 1987-06-18
AU3723384A (en) 1985-08-01
US4528959A (en) 1985-07-16
ES292800Y (en) 1987-03-01
JPS60159365A (en) 1985-08-20
BR8500236A (en) 1985-08-27
DE3560602D1 (en) 1987-10-15
ATE29557T1 (en) 1987-09-15

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