EP0114205A1 - Injection pump for diesel engines - Google Patents

Injection pump for diesel engines Download PDF

Info

Publication number
EP0114205A1
EP0114205A1 EP83110744A EP83110744A EP0114205A1 EP 0114205 A1 EP0114205 A1 EP 0114205A1 EP 83110744 A EP83110744 A EP 83110744A EP 83110744 A EP83110744 A EP 83110744A EP 0114205 A1 EP0114205 A1 EP 0114205A1
Authority
EP
European Patent Office
Prior art keywords
pump
bore
suction chamber
pump cylinder
chamber
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
EP83110744A
Other languages
German (de)
French (fr)
Other versions
EP0114205B1 (en
Inventor
Max Matzen
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.)
Kloeckner Humboldt Deutz AG
Original Assignee
Kloeckner Humboldt Deutz AG
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 Kloeckner Humboldt Deutz AG filed Critical Kloeckner Humboldt Deutz AG
Priority to AT83110744T priority Critical patent/ATE26155T1/en
Publication of EP0114205A1 publication Critical patent/EP0114205A1/en
Application granted granted Critical
Publication of EP0114205B1 publication Critical patent/EP0114205B1/en
Expired legal-status Critical Current

Links

Images

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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition

Definitions

  • the invention relates to an injection pump for diesel internal combustion engines with the features of the type specified in the preamble of the first claim.
  • Injection pumps of the type mentioned are generally known. They work satisfactorily as long as no high peak pressures are required of them. Due to the demand for reducing fuel consumption and improving the exhaust gas values in diesel internal combustion engines, very short delivery angles and thus also very high peak pressures are increasingly being realized in the injection pump. This leads to very high loads at the critical points. This includes, among other things, the seal between the pump cylinder and the pump housing and cavitation phenomena on the overflow hole between the pump chamber and the suction chamber.
  • the object of the present invention is to prevent the seals between the pump housing and the pump cylinder from being damaged despite the highest injection pressures in injection pumps of the type mentioned at the outset.
  • the arrangement of the bore, the seal is relieved of the pressure surges which occur when discharges when Abschvorgang the high pressure from the P umpenraum over the overflow bore in the suction chamber.
  • the bore according to the invention therefore advantageously begins above the seal in order to absorb the pressure surges in front of the seal.
  • the development according to claim 2 solves the additional task of avoiding cavitation phenomena in the overflow bore, since the bore in the area of the lowest pressure returns the pressure on the seal. On the one hand, this ensures that the pressure on the seal is released quickly and reliably and, on the other hand, that the very strong pressure reduction is eliminated in the overflow bore.
  • a section of an injection pump is shown in axial section.
  • 1 denotes the pump housing, 2 the pump cylinder and 3 the pump piston.
  • the pump piston 3 is of a conventional type and has an oblique control edge 4 which, depending on the position of the pump piston 3, connects the pump chamber 5 to an overflow bore 6 arranged in the pump cylinder 2, which in turn is connected to the suction chamber 7 arranged in the pump housing 1.
  • a sealing ring 8 is provided below the suction chamber 7 in order to prevent fuel between the pump cylinder and the pump housing from reaching the drive region of the injection pump, which is not shown below. Due to the gap that is unavoidably present between the pump cylinder 2 and the pump housing 1, H.
  • the pump chamber 5 is released by the control edge 4
  • fuel returns via the overflow bore 6 into the suction channel 7.
  • the pressure in the gap between the pump housing 1 and the pump cylinder 2 reaches the seal 8.
  • a bore 9 is provided in the pump cylinder, which leads from above the seal 8 to the point in the overflow bore 6 where the lowest pressure prevails. Due to the return of the pressure from the seal chamber to the overflow bore, the seal 8 is relieved of pressure on the one hand and the vacuum which is responsible for the cavitation in the overflow bore 6 is reduced on the other hand.
  • Fig. Lb shows the pressure curve (solid line) in the position of the pump piston shown in Fig. La when no bore 9 is present. It is clearly visible how the pressure drops in the overflow bore due to the high flow velocity of the fuel. If the bore proposed according to the invention is provided, the pressure curve in the overflow bore shown in dashed lines results.

Landscapes

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

Abstract

1. An injection pump for compression ignition Diesel engines, comprising a pump housing (1) with a suction chamber (7) and with at least one pump cylinder having a pump piston (3) with an oblique control edge (4) guided therein, the suction chamber (7) being connected to the pump chamber (5) by way of a fluid transfer bore (6) which is arranged in the pump cylinder (2) and in the region of which the pump cylinder (2) is sealed off from the housing by means of a gasket (8), characterized in that the sealing region between the gasket (8) and the suction chamber (7) is connected by way of a bore (9) with the transfer bore (6), and the bore (9) in the pump cylinder (2) opens into the fluid transfer bore (6) substantially at the point of lowest flow pressure of the fuel flowing back from the pump chamber (5) into the suction chamber (7), that is, substantially at the point of maximum rate of flow.

Description

Die Erfindung bezieht sich auf eine Einspritzpumpe für Dieselbrennkraftmaschinen mit den Merkmalen des im Oberbegriff des ersten Anspruchs angegebenen Art.The invention relates to an injection pump for diesel internal combustion engines with the features of the type specified in the preamble of the first claim.

Einspritzpumpen der genannten Gattung sind allgemein bekannt. Sie arbeiten so lange zufriedenstellend, wie von ihnen keine hohe Spitzendrücke verlangt werden. Aufgrund der Forderung nach Herabsetzung des Kraftstoffverbrauchs und der Verbesserung der Abgaswerte in Dieselbrennnkraftmaschinen werden zunehmend sehr kurze Förderwinkel und damit auch sehr hohe Spitzendrücke in der Einspritzpumpe verwirklicht. Dies führt zu sehr hohen Belastungen an den kritischen Stellen. Hierzu gehören unter anderem die Dichtung zwischen dem Pumpenzylinder und dem Pumpengehäuse sowie Kavitationserscheinungen an der Uberströmbohrung zwischen Pumpenraum und Saugraum.Injection pumps of the type mentioned are generally known. They work satisfactorily as long as no high peak pressures are required of them. Due to the demand for reducing fuel consumption and improving the exhaust gas values in diesel internal combustion engines, very short delivery angles and thus also very high peak pressures are increasingly being realized in the injection pump. This leads to very high loads at the critical points. This includes, among other things, the seal between the pump cylinder and the pump housing and cavitation phenomena on the overflow hole between the pump chamber and the suction chamber.

Aufgabe der vorliegenden Erfindung ist es, bei Einspritzpumpen der eingangs genannten Art zu verhindern, daß die Dichtung zwischen dem Pumpengehäuse und dem Pumpenzylinder trotz höchster Einspritzdrücke beschädigt wird.The object of the present invention is to prevent the seals between the pump housing and the pump cylinder from being damaged despite the highest injection pressures in injection pumps of the type mentioned at the outset.

Diese Aufgabe wird durch die kennzeichnenden Merkmale des ersten Anspruchs gelöst. Durch die Anordnung der Bohrung wird die Dichtung entlastet von den Druckstößen, die auftreten, wenn beim Absteuervorgang der hohe Druck aus dem Pumpenraum über die Überströmbohrung in den Saugraum sich entlädt. Die erfindungsgemäße Bohrung beginnt deshalb vorteilhafterweise oberhalb der Dichtung, um so die Druckstöße vor der Dichtung abzufangen.This object is achieved by the characterizing features of the first claim. The arrangement of the bore, the seal is relieved of the pressure surges which occur when discharges when Absteuervorgang the high pressure from the P umpenraum over the overflow bore in the suction chamber. The bore according to the invention therefore advantageously begins above the seal in order to absorb the pressure surges in front of the seal.

Die Weiterbildung nach Anspruch 2 löst die zusätzliche Aufgabe, Kavitationserscheinungen in der Uberströmbohrung zu vermeiden, da die Bohrung im Bereich des geringsten Druckes den auf der Dichtung lastenden Druck zurückführt. Dadurch wird zum einen erreicht, daß der auf die Dichtung lastenden Druck schnell und zuverlässig abgebaut wird und zum anderen daß in der Uberströmbohrung der sehr starke Druckabbau aufgehoben wird.The development according to claim 2 solves the additional task of avoiding cavitation phenomena in the overflow bore, since the bore in the area of the lowest pressure returns the pressure on the seal. On the one hand, this ensures that the pressure on the seal is released quickly and reliably and, on the other hand, that the very strong pressure reduction is eliminated in the overflow bore.

Im folgenden wird die Erfindung anhand eines bevorzugten Ausführungsbeispiels näher dargestellt.The invention is illustrated in more detail below on the basis of a preferred exemplary embodiment.

Es zeigt:

  • Fig. la für eine bestimmte Einspritzpumpe die geeignete Lage der erfindungsgemäßen Bohrung sowie
  • Fig. lb den Druckverlauf zwischen Pumpenraum und Saugraum über die Uberströmbohrung ohne und mit erfindungsgemäße Bohrung.
It shows:
  • Fig. La for a particular injection pump, the suitable position of the hole according to the invention and
  • Fig. Lb the pressure curve between the pump chamber and suction chamber over the overflow bore with and without the inventive bore.

In Fig. la ist ein Ausschnitt einer Einspritzpumpe im Axialschnitt dargestellt. Mit 1 ist hier das Pumpengehäuse, mit 2 der Pumpenzylinder und mit 3 der Pumpenkolben bezeichnet. Der Pumpenkolben 3 ist üblicher Bauart und weist eine schräge Steuerkante 4 auf, welche - je nach Stellung des Pumpenkolbens 3 - den Pumpenraum 5 mit einer im Pumpenzylinder 2 angeordneten Uberströmbohrung 6 verbindet, welche wiederum mit dem im Pumpengehäuse 1 angeordneten Saugraum 7 in Verbindung steht. In dem Pumpengehäuse 1 ist unterhalb des Saugraumes 7 ein Dichtring 8 vorgesehen, um zu verhindern, daß Kraftstoff zwischen Pumpenzylinder und Pumpengehäuse in den nicht dargestellten untenliegenden Antriebsbereich der Einspritzpumpe gelangt. Aufgrund der zwischen dem Pumpenzylinder 2 und dem Pumpengehäuse 1 unvermeidbar vorhandenen Spalte gelangt beim Absteuern, d. h. bei der Freigabe des Pumpenraumes 5 durch die Steuerkante 4 Kraftstoff über die Uberströmbohrung 6 in den Saugkanal 7 zurück. Gleichzeitig gelangt der Druck in den Spalt zwischen dem Pumpengehäuse 1 und dem Pumpenzylinder 2 auf die Dichtung 8.In Fig. La a section of an injection pump is shown in axial section. 1 denotes the pump housing, 2 the pump cylinder and 3 the pump piston. The pump piston 3 is of a conventional type and has an oblique control edge 4 which, depending on the position of the pump piston 3, connects the pump chamber 5 to an overflow bore 6 arranged in the pump cylinder 2, which in turn is connected to the suction chamber 7 arranged in the pump housing 1. In the pump housing 1, a sealing ring 8 is provided below the suction chamber 7 in order to prevent fuel between the pump cylinder and the pump housing from reaching the drive region of the injection pump, which is not shown below. Due to the gap that is unavoidably present between the pump cylinder 2 and the pump housing 1, H. When the pump chamber 5 is released by the control edge 4, fuel returns via the overflow bore 6 into the suction channel 7. At the same time, the pressure in the gap between the pump housing 1 and the pump cylinder 2 reaches the seal 8.

Um die Dichtung 8 druckzuentlasten ist eine Bohrung 9 im Pumpenzylinder vorgesehen, welche von oberhalb der Dichtung 8 zu der Stelle in die Uberstrombohrung 6 führt, wo der geringste Druck herrscht. Aufgrund der Rückleitung des Druckes von dem Dichtungraums zur Uberströmbohrung wird zum einen die Dichtung 8 druckentlastet und zum anderen der Unterdruck, der für die Kavitation in der Uberströmbohrung 6 verantwortlich ist, abgebaut.In order to relieve the pressure on the seal 8, a bore 9 is provided in the pump cylinder, which leads from above the seal 8 to the point in the overflow bore 6 where the lowest pressure prevails. Due to the return of the pressure from the seal chamber to the overflow bore, the seal 8 is relieved of pressure on the one hand and the vacuum which is responsible for the cavitation in the overflow bore 6 is reduced on the other hand.

Fig. lb zeigt den Druckverlauf (ausgezogene Linie) bei der in Fig. la dargestellten Stellung des Pumpenkolbens, wenn keine Bohrung 9 vorhanden ist. Hierbei ist deutlich sichtbar, wie aufgrund der hohen Strömungsgeschwindigkeit des Kraftstoffs in der Uberströmbohrung sein Druck abfällt. Wird die erfindungsgemäß vorgeschlagene Bohrung vorgesehen, so ergibt sich der gestrichelt dargestellte Druckverlauf in der Überströmbohrung.Fig. Lb shows the pressure curve (solid line) in the position of the pump piston shown in Fig. La when no bore 9 is present. It is clearly visible how the pressure drops in the overflow bore due to the high flow velocity of the fuel. If the bore proposed according to the invention is provided, the pressure curve in the overflow bore shown in dashed lines results.

Claims (2)

1. Einspritzpumpe für Dieselbrennkraftmaschinen, bestehend aus einem Pumpengehäuse (1) mit Saügraum (7), mit mindestens einen Pumpenzylinder und einen darin geführten Pumpenkolben (3) mit schräger Steuerkante (4), wobei der Saugraum (7) mit dem Pumpenraum (5) über eine im Pumpenzylinder (2) angeordnete Uberströmbohrung (6) verbunden ist, in deren Bereich der Pumpenzylinder (2) gegenüber dem Gehäuse über Dichtungen (8) abgedichtet ist, dadurch gekennzeichnet, daß der Dichtungsbereich über eine Bohrung (9) mit der Überströmbohrung (6) verbunden ist.1. Injection pump for diesel internal combustion engines, consisting of a pump housing (1) with suction chamber (7), with at least one pump cylinder and a pump piston (3) guided therein with an oblique control edge (4), the suction chamber (7) with the pump chamber (5) Is connected via an overflow bore (6) arranged in the pump cylinder (2), in the area of which the pump cylinder (2) is sealed off from the housing via seals (8), characterized in that the sealing area is connected to the overflow bore (9) via a bore (9). 6) is connected. 2. Einspritzpumpe für Dieselbrennkraftmaschinen nach Anspruch 1,
dadurch gekennzeichnet, daß die Bohrung (9) im Pumpenzylinder (2) an der Stelle des niedrigsten Strömungsdruckes, d. h. an der Stelle der höchsten Strömungsgeschwindigkeit in die Uberströmbohrung (6) mündet.2. Injection pump for diesel internal combustion engines according to claim 1,
characterized in that the bore (9) in the pump cylinder (2) opens into the overflow bore (6) at the point of the lowest flow pressure, ie at the point of the highest flow velocity.
EP83110744A 1983-01-03 1983-10-27 Injection pump for diesel engines Expired EP0114205B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83110744T ATE26155T1 (en) 1983-01-03 1983-10-27 INJECTION PUMP FOR DIESEL ENGINES.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19833300030 DE3300030A1 (en) 1983-01-03 1983-01-03 INJECTION PUMP FOR DIESEL INTERNAL COMBUSTION ENGINES
DE3300030 1983-01-03

Publications (2)

Publication Number Publication Date
EP0114205A1 true EP0114205A1 (en) 1984-08-01
EP0114205B1 EP0114205B1 (en) 1987-03-25

Family

ID=6187667

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83110744A Expired EP0114205B1 (en) 1983-01-03 1983-10-27 Injection pump for diesel engines

Country Status (3)

Country Link
EP (1) EP0114205B1 (en)
AT (1) ATE26155T1 (en)
DE (2) DE3300030A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4690624A (en) * 1985-10-08 1987-09-01 Robert Bosch Gmbh Fuel injection pump for internal combustion engines
DE10046564A1 (en) * 2000-09-19 2002-04-04 Orange Gmbh Fuel injection pump for IC engines esp. Diesel engines etc. has intake bore and parallel connection bore from suction chamber to pump cylinder bore
US8528458B2 (en) 2011-07-27 2013-09-10 Bernard T. Windauer Pressure-regulating gas block

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3620803A1 (en) * 1986-06-20 1987-12-23 Kloeckner Humboldt Deutz Ag Injection pump for diesel internal combustion engines

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB334437A (en) * 1928-12-10 1930-09-04 Robert Bosch Aktiengesellschaft
DE831038C (en) * 1941-11-18 1952-02-11 Friedrich Wilhelm Deckel Dipl Fuel injection pump for internal combustion engines
FR2153961A5 (en) * 1971-09-18 1973-05-04 Bosch
FR2389007A1 (en) * 1977-04-30 1978-11-24 Lucas Industries Ltd FUEL INJECTION PUMP

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH143812A (en) * 1928-12-10 1930-11-30 Bosch Robert Ag Fuel injection pump.
DE2150973A1 (en) * 1971-10-13 1973-04-19 Bosch Gmbh Robert FUEL INJECTION PUMP FOR COMBUSTION MACHINES

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB334437A (en) * 1928-12-10 1930-09-04 Robert Bosch Aktiengesellschaft
DE831038C (en) * 1941-11-18 1952-02-11 Friedrich Wilhelm Deckel Dipl Fuel injection pump for internal combustion engines
FR2153961A5 (en) * 1971-09-18 1973-05-04 Bosch
FR2389007A1 (en) * 1977-04-30 1978-11-24 Lucas Industries Ltd FUEL INJECTION PUMP

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4690624A (en) * 1985-10-08 1987-09-01 Robert Bosch Gmbh Fuel injection pump for internal combustion engines
DE10046564A1 (en) * 2000-09-19 2002-04-04 Orange Gmbh Fuel injection pump for IC engines esp. Diesel engines etc. has intake bore and parallel connection bore from suction chamber to pump cylinder bore
DE10046564B4 (en) * 2000-09-19 2005-07-21 L'orange Gmbh Injection pump for internal combustion engines
US8528458B2 (en) 2011-07-27 2013-09-10 Bernard T. Windauer Pressure-regulating gas block

Also Published As

Publication number Publication date
DE3370513D1 (en) 1987-04-30
ATE26155T1 (en) 1987-04-15
DE3300030A1 (en) 1984-07-05
EP0114205B1 (en) 1987-03-25

Similar Documents

Publication Publication Date Title
EP0391366B1 (en) Fuel injection apparatus
EP0301310A1 (en) Axial piston machine of the plate or inclined axis type with distribution slots and pressure compensation canals
EP2273115A1 (en) Fluid pump, particularly high-pressure fuel pump, having pressure damper
DE69823805T2 (en) High pressure pump for gasoline injection
DE2848208B1 (en) Pilot operated pressure relief valve with feed function
DE4320620B4 (en) Fuel injection device for internal combustion engines
DE2100844A1 (en) Displacement pumps, in particular for servo devices in motor vehicles
DE10245084A1 (en) Pressure limiting device and fuel system with such a pressure limiting device
WO2007012510A1 (en) Fuel injection device for an internal combustion engine using direct fuel injection
DE19848217A1 (en) Gas compressor has additional compression chambers and throttle pipes to bypass closure valves when idling, to lower self-stabilizing idling pressure
DE19507295A1 (en) Radial piston fuel pump for IC engine
EP0114205A1 (en) Injection pump for diesel engines
WO2021185508A1 (en) High-pressure fuel pump
DE2612973A1 (en) INJECTION UNIT OF AN INJECTION PUMP FOR COMBUSTION ENGINES
DE7925377U1 (en) FUEL INJECTION PUMP FOR COMBUSTION MACHINES
EP0922165B1 (en) Vacuum pump
EP0269610A1 (en) Pump element of a fuel injection pump for an injection combustion engine
DE2217066A1 (en) Fuel injection pump for internal combustion engines
EP0816680A2 (en) Vane pump
DE2125524C3 (en) Leak fuel lock in a reciprocating fuel injection pump for internal combustion engines
DE2658833A1 (en) FUEL INJECTION SYSTEM FOR AIR COMPRESSING COMBUSTION ENGINES
AT407900B (en) INTERNAL COMBUSTION ENGINE WITH INLET AND EXHAUST VALVES
DE19902259A1 (en) Assembly process
DE3420890A1 (en) Pressure-relief valve, in particular for hydraulic telescopic props and the like
EP0528254A2 (en) Control arrangement for positive displacement pumps

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT DE FR GB IT

17P Request for examination filed

Effective date: 19840710

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT DE FR GB IT

REF Corresponds to:

Ref document number: 26155

Country of ref document: AT

Date of ref document: 19870415

Kind code of ref document: T

ITF It: translation for a ep patent filed

Owner name: ING. C. GREGORJ S.P.A.

ET Fr: translation filed
REF Corresponds to:

Ref document number: 3370513

Country of ref document: DE

Date of ref document: 19870430

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19880923

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 19890911

Year of fee payment: 7

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19890912

Year of fee payment: 7

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19890930

Year of fee payment: 7

ITTA It: last paid annual fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19900703

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19901027

Ref country code: AT

Effective date: 19901027

GBPC Gb: european patent ceased through non-payment of renewal fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19910628

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST