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EP0214115B1 - Fuel injection pump - Google Patents

Fuel injection pump Download PDF

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Publication number
EP0214115B1
EP0214115B1 EP86890209A EP86890209A EP0214115B1 EP 0214115 B1 EP0214115 B1 EP 0214115B1 EP 86890209 A EP86890209 A EP 86890209A EP 86890209 A EP86890209 A EP 86890209A EP 0214115 B1 EP0214115 B1 EP 0214115B1
Authority
EP
European Patent Office
Prior art keywords
spring chamber
bore
cylinder barrel
intermediate sleeve
fuel injection
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.)
Expired
Application number
EP86890209A
Other languages
German (de)
French (fr)
Other versions
EP0214115A1 (en
Inventor
Jaroslaw Dipl.-Ing. Hlousek
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.)
ROBERT BOSCH AG
Original Assignee
Robert Bosch AG
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch AG, Robert Bosch GmbH filed Critical Robert Bosch AG
Publication of EP0214115A1 publication Critical patent/EP0214115A1/en
Application granted granted Critical
Publication of EP0214115B1 publication Critical patent/EP0214115B1/en
Expired legal-status Critical Current

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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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/48—Assembling; Disassembling; Replacing
    • F02M59/485—Means for fixing delivery valve casing and barrel to each other or to pump casing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/001—Pumps with means for preventing erosion on fuel discharge
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/442—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston means preventing fuel leakage around pump plunger, e.g. fluid barriers

Definitions

  • the invention relates to a fuel injection pump for internal combustion engines with a cylinder liner receiving a pump piston, which has at least one return flow bore controlled by the pump piston and which is surrounded in the return flow bore by a rotatable impact protection ring, the end of which is turned away from the spring chamber and is supported against a shoulder, and which encloses an annular space with an approximately cylindrical wall part, which is connected to a return flow space via at least one flow-through hole.
  • the end of the impact protection ring which faces the spring chamber must now also be supported and, moreover, the space between the housing and the cylinder liner must also be sealed off from the fuel-carrying space.
  • an intermediate sleeve is provided between the cylinder liner and the housing wall for this purpose, which seals against the cylinder liner by means of sealing rings arranged on the inside and against the housing by means of sealing rings arranged on the outside is.
  • the annular space between the cylinder liner and the housing bore is very narrow and therefore the sealing rings arranged on the inside of the intermediate sleeve and on the outside of the intermediate sleeve present difficulties.
  • the object of the invention is now to improve the seal between the fuel-carrying space and the spring space and at the same time to simplify it.
  • a division of the impact protection ring is to be avoided and the cylinder liner can be easily removed.
  • the invention essentially consists in that the end face of the impact protection ring facing the spring chamber is supported against at least two intermediate sleeves arranged between the cylinder liner and the pump housing, between the end faces of which at least one deformable sealing ring is pressed, and of which the intermediate sleeve facing the spring chamber is pressed against one Snap ring is supported, while the intermediate sleeve facing away from the spring space forms the support for the impact protection ring.
  • the deformable sealing ring is arranged between at least two intermediate sleeves and is pressed between these intermediate sleeves, the arrangement of a sealing ring with a relatively large cross-section is made possible, which is now pressed against the cylinder liner as well as against the housing bore by the axial pressure that an effective and safe sealing of the fuel-guiding space against the spring chamber is guaranteed.
  • the intermediate sleeve facing away from the spring chamber also forms the support for the impact protection ring. Because the intermediate sleeve facing away from the spring chamber forms the support for the impact protection ring, a division of the impact protection ring can be avoided since it can be pushed over the cylinder liner up to one shoulder. The corrosion phenomena can be reduced by avoiding the division of the impact protection ring.
  • the arrangement of at least two intermediate sleeves between the cylinder liner and the pump housing, between the end faces of which at least one deformable sealing ring is pressed, not only provides a simple seal between the fuel-carrying space and the spring chamber, but also a simple removal of the cylinder liner with all the drive mechanisms located below. and regulating parts upwards.
  • the intermediate sleeve facing away from the spring chamber can be supported against a collar of the cylinder liner.
  • the spring force exerted by the sealing ring can be at least partially absorbed by the collar of the cylinder liner and the impact protection ring can be arranged to rotate freely.
  • the rotatable arrangement of the impact protection ring has the effect that the fuel jet always strikes another point on the impact protection ring and thus the signs of corrosion on the impact protection ring are reduced.
  • the arrangement can also be such that the cylinder liner is smooth in the area of the intermediate sleeve and that the intermediate sleeves are supported via the impact protection ring against the shoulder, against which the end of the impact protection ring facing away from the spring chamber is supported.
  • the impact protection ring is held under axial spring tension. The torsion of the impact protection ring is braked by the spring tension and can therefore be checked.
  • three intermediate sleeves can also be advantageously arranged between the cylinder liner and the housing, between which deformable seals are pressed, of which the middle intermediate sleeve has at least one radial locking oil bore, which on the one hand contains at least one lubricating oil from the lubrication system of the engine and on the other hand communicates with at least one bore leading to the piston running surface of the cylinder liner.
  • the middle intermediate sleeve has at least one radial locking oil bore, which on the one hand contains at least one lubricating oil from the lubrication system of the engine and on the other hand communicates with at least one bore leading to the piston running surface of the cylinder liner.
  • Fig. 1 shows an axial section through an embodiment.
  • Fig. 2 shows a section along line 11-11 of Fig. 1 through the cylinder liner and the impact protection ring.
  • Fig. 3 shows a partial section through the cylinder liner and the housing of another embodiment.
  • the cylinder liner 1 has two overflow openings 2.
  • the backflow space arranged in the housing 3 is designated by 4.
  • 5 is the impact protection ring which has 2 throughflow openings 6 outside the region of the overflow openings.
  • the impact protection ring 5 is supported against a shoulder 7 of the cylinder liner 1 and is formed from one piece without division, since it can be pushed onto the liner via the cylinder liner 1 up to the shoulder 7.
  • two intermediate sleeves 9 and 10 made of rigid material, such as steel, are arranged in the annular gap 8 between the cylinder liner 1 and the housing 3.
  • the intermediate sleeve 9 is supported against the shoulder 11 of the cylinder liner 1 and the intermediate sleeve 10 is supported against a snap ring 12 which engages in the cylinder liner 1.
  • a sealing ring 13 Arranged between the intermediate sleeves 9 and 10 is a sealing ring 13 made of deformable material, for example rubber, which is pressed together by these intermediate sleeves 9 and 10 and therefore rests sealingly on the housing 3 and on the cylinder liner 1.
  • the impact protection ring 5 is supported on the side opposite the shoulder 7 against the intermediate sleeve 9. The impact protection ring 5 can therefore rotate under the action of the fuel jets emerging from the overflow openings 2, so that new surface parts of the impact protection ring 5 are exposed to the fuel jet and the corrosion phenomena are thereby reduced.
  • the shoulder 11 of the cylinder liner can also be omitted, the cylindrical outer surface of the cylinder liner 1 then being smooth from the area of the backflow openings 2 to the area of the intermediate sleeves 9 and 10.
  • the elastic force of the seal 13 is transmitted to the intermediate ring, so that the impact protection ring is pressed between the shoulder 7 and the intermediate sleeve 9.
  • the rotation of the impact protection ring 5 is braked.
  • Below the intermediate sleeve 10, which is supported against the snap ring 12 is the spring chamber (not shown) of the injection pump, which is indicated by the reference number 14.
  • the embodiment according to FIG. 3 differs from the embodiment according to FIGS. 1 and 2 in that three intermediate sleeves 9, 10 and 15 are arranged in the annular gap 8 between the cylinder liner 1 and the housing 3.
  • the intermediate sleeve 9 facing away from the spring chamber 14 is again supported against the shoulder 11 of the cylinder liner 1 and the intermediate sleeve 10 facing the spring chamber 14 is again supported against a snap ring 12 inserted into the cylinder liner 1.
  • a sealing ring 16 is pressed between the intermediate sleeves 9 and 15 and a sealing ring 17 is pressed between the intermediate sleeves 10 and 15.
  • the intermediate sleeve 15 has a radial locking oil bore 18 which opens into an annular groove 19 in the housing and into an annular groove 20 in the cylinder liner.
  • Lubricating oil from the lubrication system of the engine is supplied to the annular groove 19 via a bore 21 in the housing 3.
  • a bore 22 is connected to the annular groove 20 so that lubricating oil enters an annular groove 23. which is provided in the piston running surface 24 of the sleeve 1. In this way, a so-called sealing oil seal is created, which prevents fuel from getting into the spring space 14 from the space carrying the fuel, namely from the return flow bores 2, and in this way damages the lubricating oil in the gear space of the injection pump.

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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)

Description

Die Erfindung bezieht sich auf eine Kraftstoffeinspritzpumpe für Brennkraftmaschinen mit einer einen Pumpenkolben aufnehmenden Zylinderbüchse, die mindestens eine vom Pumpenkolben gesteuerte Rückströmbohrung aufweist und die im Bereich der Rückströmbohrung von einem verdrehbaren Prallschutzring umgeben ist, dessen vom Federraum abgewendetes Stirnende gegen eine Schulter abgestützt ist, und welcher mit einem ungefähr zylindrischen Wandteil einen Ringraum umschließt, der über wenigstens eine Durchflutungsbohrung mit einem Rückströmraum verbunden ist. Das dem Federraum zugewendete Stirnende des Prallschutzringes muß nun gleichfalls abgestützt sein und es muß überdies auch der Raum zwischen dem Gehäuse und der Zylinderbüchse gegenüber dem Brennstoff führenden Raum abgedichtet sein.The invention relates to a fuel injection pump for internal combustion engines with a cylinder liner receiving a pump piston, which has at least one return flow bore controlled by the pump piston and which is surrounded in the return flow bore by a rotatable impact protection ring, the end of which is turned away from the spring chamber and is supported against a shoulder, and which encloses an annular space with an approximately cylindrical wall part, which is connected to a return flow space via at least one flow-through hole. The end of the impact protection ring which faces the spring chamber must now also be supported and, moreover, the space between the housing and the cylinder liner must also be sealed off from the fuel-carrying space.

Gemäß der EP-A-0153919 (Stand der Technik nach Art. 54 (3)) ist zu diesem Zweck eine Zwischenhülse zwischen der Zylinderbüchse und der Gehäusewand vorgesehen, welche durch innen angeordnete Dichtungsringe gegenüber der Zylinderbüchse und durch außen angeordnete Dichtungsringe gegenüber dem Gehäuse abgedichtet ist. Der Ringraum zwischen der Zylinderbüchse und der Gehäusebohrung ist sehr schmal und es bieten daher die auf der Innenseite der Zwischenhülse und die auf der Außenseite der Zwischenhülse angeordneten Dichtungsringe Schwierigkeiten. Infolge der schmalen Bemessung dieser Dichtungsringe ist die Abdichtung unsicher und besteht die Gefahr, daß Brennstoff in den Federraum und damit zur Nockenwelle der Einspritzpumpe gelangt und das Schmieröl verdünnt, wodurch die Schmiereigenschaften verschlechtert werden.According to EP-A-0153919 (prior art according to Art. 54 (3)), an intermediate sleeve is provided between the cylinder liner and the housing wall for this purpose, which seals against the cylinder liner by means of sealing rings arranged on the inside and against the housing by means of sealing rings arranged on the outside is. The annular space between the cylinder liner and the housing bore is very narrow and therefore the sealing rings arranged on the inside of the intermediate sleeve and on the outside of the intermediate sleeve present difficulties. As a result of the narrow dimensions of these sealing rings, the seal is unsafe and there is a risk that fuel gets into the spring chamber and thus to the camshaft of the injection pump and the lubricating oil is diluted, as a result of which the lubricating properties are impaired.

Die Erfindung stellt sich nun zur Aufgabe, die Abdichtung zwischen dem Brennstoff führenden Raum und dem Federraum zu verbessern und gleichzeitig auch zu vereinfachen. Gleichzeitig soll eine Teilung des Prallschutzringes vermieden werden und ein einfacher Ausbau der Zylinderbüchse ermöglicht werden. Zu diesem Zweck besteht die Erfindung im wesentlichen darin, daß das dem Federraum zugewendete Stirnende des Prallschutzringes gegen wenigstens zwei zwischen Zylinderbüchse und Pumpengehäuse angeordnete Zwischenhülsen abgestützt ist, zwischen deren Stirnflächen wenigstens ein deformierbarer Dichtungsring gepreßt ist, und von welchen die dem Federraum zugewendete Zwischenhülse gegen einen Sprengring abgestützt ist, während die vom Federraum abgewendete Zwischenhülse die Abstützung für den Prallschutzring bildet. Dadurch, daß der deformierbare Dichtungsring zwischen wenigstens zwei Zwischenhülsen angeordnet ist und zwischen diesen Zwischenhülsen gepreßt liegt, wird die Anordnung eines Dichtungsringes mit verhältnismäßig großem Querschnitt ermöglicht, der nun durch die axiale Pressung sowohl gegen die Zylinderbüchse, als auch gegen die Gehäusebohrung angepreßt wird, so daß eine wirksame und sichere Abdichtung des Brennstoff führenden Raumes gegenüber dem Federraum gewährleistet wird. Hiebei bildet die vom Federraum abgewendete Zwischenhülse gleichzeitig die Abstützung für den Prallschutzring. Dadurch, daß die vom Federraum abgewendete Zwischenhülse die Abstützung für den Prallschutzring bildet, kann eine Teilung des Prallschutzringes vermieden werden, da er über die Zylinderbüchse bis zu einer Schulter geschoben werden kann. Durch die Vermeidung der Teilung des Prallschutzrings können die Korrosionserscheinungen verringert werden. Durch die Anordnung von wenigstens zwei Zwischenhülsen zwischen Zylinderbüchse und Pumpengehäuse, zwischen deren Stirnflächen wenigstens ein deformierbarer Dichtungsring gepreßt ist, wird nicht nur eine einfache Abdichtung zwischen dem Brennstoff führenden Raum und dem Federraum, sondern auch ein einfacher Ausbau der Zylinderbüchse mit sämtlichen unterhalb befindlichen Antriebs- und Regulierteilen nach oben hin ermöglicht.The object of the invention is now to improve the seal between the fuel-carrying space and the spring space and at the same time to simplify it. At the same time, a division of the impact protection ring is to be avoided and the cylinder liner can be easily removed. For this purpose, the invention essentially consists in that the end face of the impact protection ring facing the spring chamber is supported against at least two intermediate sleeves arranged between the cylinder liner and the pump housing, between the end faces of which at least one deformable sealing ring is pressed, and of which the intermediate sleeve facing the spring chamber is pressed against one Snap ring is supported, while the intermediate sleeve facing away from the spring space forms the support for the impact protection ring. Because the deformable sealing ring is arranged between at least two intermediate sleeves and is pressed between these intermediate sleeves, the arrangement of a sealing ring with a relatively large cross-section is made possible, which is now pressed against the cylinder liner as well as against the housing bore by the axial pressure that an effective and safe sealing of the fuel-guiding space against the spring chamber is guaranteed. The intermediate sleeve facing away from the spring chamber also forms the support for the impact protection ring. Because the intermediate sleeve facing away from the spring chamber forms the support for the impact protection ring, a division of the impact protection ring can be avoided since it can be pushed over the cylinder liner up to one shoulder. The corrosion phenomena can be reduced by avoiding the division of the impact protection ring. The arrangement of at least two intermediate sleeves between the cylinder liner and the pump housing, between the end faces of which at least one deformable sealing ring is pressed, not only provides a simple seal between the fuel-carrying space and the spring chamber, but also a simple removal of the cylinder liner with all the drive mechanisms located below. and regulating parts upwards.

Gemäß der Erfindung kann die vom Federraum abgewendete Zwischenhülse gegen einen Bund der Zylinderbüchse abgestützt sein. In diesem Falle kann die durch den Dichtungsring ausgeübte Federkraft vom Bund der Zylinderbüchse zumindest teilweise aufgenommen werden und der Prallschutzring kann frei drehbar angeordnet sein. Die drehbare Anordnung des Prallschutzringes hat den Effekt, daß der Brennstoffstrahl imner auf eine andere Stelle des Prallschutzringes auftrifft und damit die Korrosionserscheinungen am Prallschutzring verringert werden.According to the invention, the intermediate sleeve facing away from the spring chamber can be supported against a collar of the cylinder liner. In this case, the spring force exerted by the sealing ring can be at least partially absorbed by the collar of the cylinder liner and the impact protection ring can be arranged to rotate freely. The rotatable arrangement of the impact protection ring has the effect that the fuel jet always strikes another point on the impact protection ring and thus the signs of corrosion on the impact protection ring are reduced.

Gemäß der Erfindung kann aber auch die Anordnung so getroffen sein, daß die Zylinderbüchse im Bereich der Zwischenhülse glatt ausgebildet ist und daß die Zwischenhülsen über den Prallschutzring gegen die Schulter abgestützt sind, gegen welche das vom Federraum abgewendete Stirnende des Prallschutzringes abgestützt ist. In diesem Falle wird der Prallschutzring unter axialer Federspannung gehalten. Die Verdrehung des Prallschutzringes wird durch die Federspannung gebremst und kann daher kontrolliert werden. Gemäß der Erfindung können auch in vorteilhafter Weise zwischen Zylinderbüchse und Gehäuse drei Zwischenhülsen angeordnet sein, zwischen welchen deformierbare Dichtungen gepreßt sind, von welchen die mittlere Zwischenhülse wenigstens eine radiale Sperrölbohrung aufweist, welche einerseits mit wenigstens einer Schmieröl aus dem Schmiersystem des Motors führenden Gehäusebohrung und anderseits mit wenigstens einer zur Kolbenlauffläche der Zylinderbüchse führenden Bohrung in Verbindung steht. Auf diese Weise wird nicht nur eine zweifache Abdichtung des Ringspaltes zwischen Zylinderbüchse und Gehäuse erreicht, sondern es wird eine sogenannte Sperröldichtung geschaffen, durch welche verhindert wird, daß Brennstoff in den Federraum und damit zum Triebwerk der Einspritzpumpe gelangt, das Schmieröl verdünnt und die Schmiereigenschaften verschlechtert.According to the invention, however, the arrangement can also be such that the cylinder liner is smooth in the area of the intermediate sleeve and that the intermediate sleeves are supported via the impact protection ring against the shoulder, against which the end of the impact protection ring facing away from the spring chamber is supported. In this case, the impact protection ring is held under axial spring tension. The torsion of the impact protection ring is braked by the spring tension and can therefore be checked. According to the invention, three intermediate sleeves can also be advantageously arranged between the cylinder liner and the housing, between which deformable seals are pressed, of which the middle intermediate sleeve has at least one radial locking oil bore, which on the one hand contains at least one lubricating oil from the lubrication system of the engine and on the other hand communicates with at least one bore leading to the piston running surface of the cylinder liner. In this way, not only a double seal of the annular gap between the cylinder liner and the housing is achieved, but a so-called sealing oil seal is created, through which fuel is prevented from entering the Spring chamber and thus to the injection pump engine, the lubricating oil diluted and the lubricating properties deteriorated.

In der Zeichnung ist die Erfindung an Hand von Ausführungsbeispielen schematisch erläutert.In the drawing, the invention is explained schematically using exemplary embodiments.

Fig. 1 zeigt einen Axialschnitt durch eine Ausführungsform. Fig. 2 zeigt einen Schnitt nach Linie 11-11 der Fig. 1 durch die Zylinderbüchse und den Prallschutzring. Fig. 3 zeigt einen Teilschnitt durch die Zylinderbüchse und das Gehäuse einer anderen Ausführungsform.Fig. 1 shows an axial section through an embodiment. Fig. 2 shows a section along line 11-11 of Fig. 1 through the cylinder liner and the impact protection ring. Fig. 3 shows a partial section through the cylinder liner and the housing of another embodiment.

Bei der Ausführungsform nach Fig. 1 und 2 weist die Zylinderbüchse 1 zwei Überströmöffnungen 2 auf. Der im Gehäuse 3 angeordnete Rückströmraum ist mit 4 bezeichnet. 5 ist der Prallschutzring, der außerhalb des Bereiches der Überströmöffnungen 2 Durchflutungsöffnungen 6 aufweist. Der Prallschutzring 5 ist gegen eine Schulter 7 der Zylinderbüchse 1 abgestützt und aus einem Stück ohne Teilung ausgebildet, da er über die Zylinderbüchse 1 bis zur Schulter 7 auf die Büchse aufgeschoben werden kann. Im Ringspalt 8 zwischen der Zylinderbüchse 1 und dem Gehäuse 3 sind zwei Zwischenhülsen 9 und 10 aus starrem Material, wie beispielsweise Stahl, angeordnet. Die Zwischenhülse 9 ist gegen die Schulter 11 der Zylinderbüchse 1 abgestützt und die Zwischenhülse 10 ist gegen einen Sprengring 12, welcher in der Zylinderbüchse 1 einrastet, abgestützt. Zwischen den Zwischenhülsen 9 und 10 ist ein Dichtungsring 13 aus deformierbarem Material, beispielsweise Gummi, angeordnet, welcher durch diese Zwischenhülsen 9 und 10 zusammengepreßt wird und daher dichtend am Gehäuse 3 und an der Zylinderbüchse 1 anliegt. Der Prallschutzring 5 ist an der der Schulter 7 gegenüberliegenden Seite gegen die Zwischenhülse 9 abgestützt. Der Prallschutzring 5 kann sich daher unter der Wirkung der aus den Überströmöffnungen 2 austretenden Brennstoffstrahlen verdrehen, so daß immer neue Oberflächenteile des Prallschutzringes 5 dem Brennstoffstrahl ausgesetzt werden und dadurch die Korrosionserscheinungen verringert werden.In the embodiment according to FIGS. 1 and 2, the cylinder liner 1 has two overflow openings 2. The backflow space arranged in the housing 3 is designated by 4. 5 is the impact protection ring which has 2 throughflow openings 6 outside the region of the overflow openings. The impact protection ring 5 is supported against a shoulder 7 of the cylinder liner 1 and is formed from one piece without division, since it can be pushed onto the liner via the cylinder liner 1 up to the shoulder 7. In the annular gap 8 between the cylinder liner 1 and the housing 3, two intermediate sleeves 9 and 10 made of rigid material, such as steel, are arranged. The intermediate sleeve 9 is supported against the shoulder 11 of the cylinder liner 1 and the intermediate sleeve 10 is supported against a snap ring 12 which engages in the cylinder liner 1. Arranged between the intermediate sleeves 9 and 10 is a sealing ring 13 made of deformable material, for example rubber, which is pressed together by these intermediate sleeves 9 and 10 and therefore rests sealingly on the housing 3 and on the cylinder liner 1. The impact protection ring 5 is supported on the side opposite the shoulder 7 against the intermediate sleeve 9. The impact protection ring 5 can therefore rotate under the action of the fuel jets emerging from the overflow openings 2, so that new surface parts of the impact protection ring 5 are exposed to the fuel jet and the corrosion phenomena are thereby reduced.

Es kann auch die Schulter 11 der Zylinderbüchse entfallen, wobei dann die zylindrische Außenfläche der Zylinderbüchse 1 vom Bereich der Rückströmöffnungen 2 bis zum Bereich der Zwischenhülsen 9 und 10 glatt ist. In diesem Fall wird die elastische Kraft der Dichtung 13 auf den Zwischenring übertragen, so daß der Prallschutzring zwischen der Schulter 7 und der Zwischenhülse 9 gepreßt liegt. Dadurch wird die Drehung des Prallschutzringes 5 gebremst. Unterhalb der gegen den Sprengring 12 abgestützten Zwischenhülse 10 liegt der nicht dargestellte Federraum der Einspritzpumpe, welcher durch das Bezugszeichen 14 angedeutet ist.The shoulder 11 of the cylinder liner can also be omitted, the cylindrical outer surface of the cylinder liner 1 then being smooth from the area of the backflow openings 2 to the area of the intermediate sleeves 9 and 10. In this case, the elastic force of the seal 13 is transmitted to the intermediate ring, so that the impact protection ring is pressed between the shoulder 7 and the intermediate sleeve 9. As a result, the rotation of the impact protection ring 5 is braked. Below the intermediate sleeve 10, which is supported against the snap ring 12, is the spring chamber (not shown) of the injection pump, which is indicated by the reference number 14.

Die Ausführungsform nach Fig. 3 unterscheidet sich von der Ausführungsform nach Fig. 1 und 2 dadurch, daß drei Zwischenhülsen 9, 10 und 15 im Ringspalt 8 zwischen der Zylinderbüchse 1 und dem Gehäuse 3 angeordnet sind. Die vom Federraum 14 abgewendete Zwischenhülse 9 ist wieder gegen die Schulter 11 der Zylinderbüchse 1 abgestützt und die dem Federraum 14 zugewendete Zwischenhülse 10 ist wieder gegen einen in die Zylinderbüchse 1 eingesetzten Sprengring 12 abgestützt. Zwischen den Zwischenhülsen 9 und 15 liegt ein Dichtungsring 16 gepreßt und zwischen den Zwischenhülsen 10 und 15 liegt ein Dichtungsring 17 gepreßt. Diese beiden Dichtungsringe 16 und 17 dichten nun den Ringspalt 8 ab.The embodiment according to FIG. 3 differs from the embodiment according to FIGS. 1 and 2 in that three intermediate sleeves 9, 10 and 15 are arranged in the annular gap 8 between the cylinder liner 1 and the housing 3. The intermediate sleeve 9 facing away from the spring chamber 14 is again supported against the shoulder 11 of the cylinder liner 1 and the intermediate sleeve 10 facing the spring chamber 14 is again supported against a snap ring 12 inserted into the cylinder liner 1. A sealing ring 16 is pressed between the intermediate sleeves 9 and 15 and a sealing ring 17 is pressed between the intermediate sleeves 10 and 15. These two sealing rings 16 and 17 now seal the annular gap 8.

Die Zwischenhülse 15 weist eine radiale Sperrölbohrung 18 auf, welche in eine Ringnut 19 im Gehäuse und in eine Ringnut 20 in der Zylinderbüchse mündet. Über eine Bohrung 21 im Gehäuse 3 wird Schmieröl aus dem Schmiersystem des Motors der Ringnut 19 zugeführt. An die Ringnut 20 ist eine Bohrung 22 angeschlossen, so daß Schmieröl in eine Ringnut 23 gelangt. welche in der Kolbenlauffläche 24 der Büchse 1 vorgesehen ist. Auf diese Weise wird eine sogenannte Sperröldichtung geschaffen, welche verhindert, daß Brennstoff von dem den Brennstoff führenden Raum, nämlich von den Rückströmbohrungen 2, in den Federraum 14 gelangt und auf diese Weise das Schmieröl im Getrieberaum der Einspritzpumpe schädigt.The intermediate sleeve 15 has a radial locking oil bore 18 which opens into an annular groove 19 in the housing and into an annular groove 20 in the cylinder liner. Lubricating oil from the lubrication system of the engine is supplied to the annular groove 19 via a bore 21 in the housing 3. A bore 22 is connected to the annular groove 20 so that lubricating oil enters an annular groove 23. which is provided in the piston running surface 24 of the sleeve 1. In this way, a so-called sealing oil seal is created, which prevents fuel from getting into the spring space 14 from the space carrying the fuel, namely from the return flow bores 2, and in this way damages the lubricating oil in the gear space of the injection pump.

In beiden dargestellten Ausführungsbeispielen ist es möglich, die Zylinderbüchse 1 mit sämtlichen unterhalb befindlichen Antriebs- und Regulierteilen in einfacher Weise nach oben hin auszubauen.In both of the exemplary embodiments shown, it is possible to easily remove the cylinder liner 1 with all the drive and regulating parts located below.

Claims (4)

1. A fuel injection pump for internal combustion engines, having a cylinder barrel (1) which receives a pump plunger and which comprises at least one return flow bore (2) controlled by the pump plunger and is surrounded in the region of the return-flow bore (2) by a rotatable deflector ring (5), the end face of which remote from the spring chamber (14) is supported against a shoulder (7) and which with an approximately cylindrical wall portion embraces an annular space which is connected to a return-flow chamber (4) by way of at least one throughflow bore (6), characterized in that the end face of the deflector ring (5) facing the spring chamber (14) is supported against at least two intermediate sleeves (9, 10), which are arranged between the cylinder barrel (1) and the pump casing (3) and between the end faces of which at least one deformable sealing ring (13) is pressed and of which the intermediate sleeve (10) facing the spring chamber (14) is supported against a circlip (12), while the intermediate sleeve (9) remote from the spring chamber (14) forms the support for the deflector ring (5).
2. A fuel injection pump according to Claim 1, characterized in that the intermediate sleeve (9) remote from the spring chamber is supported against a collar (11) of the cylinder barrel (1).
3. A fuel injection pump according to Claim 1, characterized in that the cylinder barrel (1) is made smooth in the region of the intermediate sleeve (9, 10), and the intermediate sleeves (9, 10) are supported by way of the deflector ring (5) against the shoulder (7) against which the end face of the deflector ring (5) remote from the spring chamber (14) is supported.
4. A fuel injection pump according to any one of Claims 1, 2 or 3, characterized in that between the cylinder barrel (1) and the casing (3) three intermediate sleeves (9, 10, 15) are arranged, between which deformable seals (16, 17) are pressed and of which the middle intermediate sleeve (15) comprises at least one radial barrier oil bore (18) which is connected on the one hand to at least one casing bore (21) conveying lubricating oil from the lubricating system of the engine and on the other hand to at least one bore (22) leading to the plunger travel surface (24) of the cylinder barrel (1).
EP86890209A 1985-07-17 1986-07-15 Fuel injection pump Expired EP0214115B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT211885A AT391350B (en) 1985-07-17 1985-07-17 FUEL INJECTION PUMP
AT2118/85 1985-07-17

Publications (2)

Publication Number Publication Date
EP0214115A1 EP0214115A1 (en) 1987-03-11
EP0214115B1 true EP0214115B1 (en) 1988-03-23

Family

ID=3528149

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Application Number Title Priority Date Filing Date
EP86890209A Expired EP0214115B1 (en) 1985-07-17 1986-07-15 Fuel injection pump

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EP (1) EP0214115B1 (en)
AT (1) AT391350B (en)
DE (1) DE3660107D1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4221021B2 (en) * 2006-11-06 2009-02-12 三菱重工業株式会社 Fuel injection pump with rotary deflector
CN106026813B (en) * 2016-07-28 2018-07-03 李晓明 A kind of quick response saturable reactor

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0153919A1 (en) * 1984-02-15 1985-09-04 Robert Bosch Ag Fuel injection pump for internal combustion engines

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR886831A (en) * 1941-11-18 1943-10-26
BE788979A (en) * 1971-09-18 1973-01-15 Bosch Gmbh Robert INJECTION PUMP FOR INTERNAL COMBUSTION ENGINES
FR2242575B1 (en) * 1973-09-05 1978-11-10 Sigma Diesel
FR2243345B1 (en) * 1973-09-12 1979-02-09 Sigma Diesel
DE3136751A1 (en) * 1981-09-16 1983-03-31 Robert Bosch Gmbh, 7000 Stuttgart FUEL INJECTION PUMP FOR INTERNAL COMBUSTION ENGINES
DE3136749A1 (en) * 1981-09-16 1983-03-31 Robert Bosch Gmbh, 7000 Stuttgart FUEL INJECTION PUMP FOR INTERNAL COMBUSTION ENGINES
GB2129883B (en) * 1982-11-05 1985-10-09 Lucas Ind Plc Liquid fuel injection pump
EP0117219A3 (en) * 1983-02-17 1986-08-06 Ail Corporation Arrangement for adjusting axial positioning of injection barrel in fuel injection pump
AT389920B (en) * 1984-07-30 1990-02-26 Voest Alpine Automotive FUEL INJECTION PUMP FOR INTERNAL COMBUSTION ENGINES

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0153919A1 (en) * 1984-02-15 1985-09-04 Robert Bosch Ag Fuel injection pump for internal combustion engines

Also Published As

Publication number Publication date
EP0214115A1 (en) 1987-03-11
DE3660107D1 (en) 1988-04-28
ATA211885A (en) 1990-03-15
AT391350B (en) 1990-09-25

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