EP0073968B1 - Fuel-injection pump - Google Patents

Fuel-injection pump Download PDF

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Publication number
EP0073968B1
EP0073968B1 EP82107463A EP82107463A EP0073968B1 EP 0073968 B1 EP0073968 B1 EP 0073968B1 EP 82107463 A EP82107463 A EP 82107463A EP 82107463 A EP82107463 A EP 82107463A EP 0073968 B1 EP0073968 B1 EP 0073968B1
Authority
EP
European Patent Office
Prior art keywords
housing
plunger
piston
pump according
injection pump
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
EP82107463A
Other languages
German (de)
French (fr)
Other versions
EP0073968A1 (en
Inventor
Gérard Duplat
Jean Leblanc
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 GmbH
Original Assignee
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 GmbH filed Critical Robert Bosch GmbH
Publication of EP0073968A1 publication Critical patent/EP0073968A1/en
Application granted granted Critical
Publication of EP0073968B1 publication Critical patent/EP0073968B1/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
    • F02M41/00—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor
    • F02M41/02—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor being spaced from pumping elements
    • F02M41/06—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor being spaced from pumping elements the distributor rotating
    • F02M41/063—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor being spaced from pumping elements the distributor rotating the distributor and rotary valve controlling fuel passages to pumping elements being combined
    • 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
    • F02M41/00—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor
    • F02M41/02—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor being spaced from pumping elements
    • F02M41/06—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor being spaced from pumping elements the distributor rotating
    • F02M41/063—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor being spaced from pumping elements the distributor rotating the distributor and rotary valve controlling fuel passages to pumping elements being combined
    • F02M41/066—Arrangements for adjusting the rotary valve-distributor

Definitions

  • the invention is based on a fuel injection pump according to the preamble of claim 1.
  • a fuel injection pump according to the preamble of claim 1.
  • Such a pump is known, for example, from US-A-3 267 861 and FR-A-2184153, in which the rotationally secured guidance of the tappet in the housing by a plane-parallel one The scenery is guided. This guidance is particularly complex because of the plane parallelism and the internal tolerances in the production.
  • the invention is therefore based on the object of creating a fuel injection pump without a guide for its tappet.
  • the plunger actuated by a cam of the camshaft has a hollow cylinder guided in a bore in the housing and receiving the spring, with a safety device preventing the plunger from rotating.
  • This device is also complex to manufacture and its function is not entirely unproblematic.
  • a fuel injection pump is designed as a radial piston pump with a bushing 11 fastened in the pump housing 10, in which bush 11 is rotatably and axially displaceably mounted in a slide 12 driven by a shaft, not shown.
  • a cam ring 13 has a plurality of inwardly directed cams 14 and is also driven by the shaft via a flange 15.
  • a plurality of metering bores 31 are arranged radially in the bushing 11, and a supply groove 33 in the slide 12 connects a metering bore 31 with the displacement 32 of each bore 8.
  • a distributor groove in the slide 12 connects the displacement 32 with a branch channel, the connection with injector, not shown.
  • Four plungers 9, which are coaxial with the pistons 16, are each guided in bores 17 of the bushing 11 and have a hollow cylinder 20 and a base 18 with a groove 19.
  • a roller 21 is rotatably mounted, the cross section of the groove 19 being a circular surface section with the same radius as the roller 21 and the depth of the groove 19 being greater than the radius of the circular surface section.
  • a coil spring 22 is supported on the one hand on the bushing 11 and on the other hand on a spring plate 23 which is blown into the piston 16. As a result, the piston 16 is pressed against the inside of the tappet 9, so that the roller 21 is always in contact with the raceway 24 of the cam lever 13.
  • a locking ring 25 made of sheet metal is fastened to a hub 26 by means of a snap ring 27 and has a plurality of fingers 28 which are axially directed with respect to the slide 12.
  • an elongated hole 29 is arranged parallel to the stroke direction, and in the end face of the bush 11 a total of four openings 30 are arranged such that an opening 30 corresponds to an elongated hole 29, so that a finger 28 of the Circlip 25 engages through the opening 30 in the slot 29.
  • the plunger 9 in FIG. 3 has the base 18 with the groove 19 and the hollow cylinder 20.
  • two elongated holes 29 are formed at two diametrical locations, the longitudinal extent of each elongated hole 29 being arranged in the stroke direction.

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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

Stand der TechnikState of the art

Die Erfindung geht aus von einer Kraftstoff-Einspritzpumpe nach der Gattung des Anspruchs 1. Eine derartige Pumpe ist beispielsweise aus der US-A-3 267 861 und FR-A-2184153 bekannt, bei der die drehgesicherte Führung des Stößels im Gehäuse durch eine planparallele Kulissenführung erfolgt. Diese Führung ist insbesondere wegen der Planparallelität und der Innentoleranzen in der Herstellung aufwendig.The invention is based on a fuel injection pump according to the preamble of claim 1. Such a pump is known, for example, from US-A-3 267 861 and FR-A-2184153, in which the rotationally secured guidance of the tappet in the housing by a plane-parallel one The scenery is guided. This guidance is particularly complex because of the plane parallelism and the internal tolerances in the production.

Aufgabe der ErfindungObject of the invention

Der Erfindung liegt daher die Aufgabe zugrunde, eine Kraftstoff-Einspritzpumpe ohne Kulissenführung für deren Stößel zu schaffen.The invention is therefore based on the object of creating a fuel injection pump without a guide for its tappet.

Lösung der ErfindungsaufgabeSolution of the invention task

Ausgehend von einer Kraftstoff-Einspritzpumpe nach der Gattung des Anspruchs 1 wird diese Aufgabe mit den kennzeichnenden Merkmalen des Anspruchs 1 gelöst.Starting from a fuel injection pump according to the preamble of claim 1, this object is achieved with the characterizing features of claim 1.

Aus der DE-C-828 325 ist bereits eine Kraftstoff-Einspritzpumpe bekannt, dessen durch einen Nocken der Nockenwelle betätigter Stößel einen in einer Bohrung des Gehäuses geführten und die Feder aufnehmenden Hohlzylinder aufweist mit einer das Drehen des Stößels verhindernden Sicherheitseinrichtung. Diese Einrichtung ist in ihrer Herstellung ebenfalls aufwendig und in ihrer Funktion nicht ganz unproblematisch.From DE-C-828 325 a fuel injection pump is already known, the plunger actuated by a cam of the camshaft has a hollow cylinder guided in a bore in the housing and receiving the spring, with a safety device preventing the plunger from rotating. This device is also complex to manufacture and its function is not entirely unproblematic.

Vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen beschrieben. Mit der Augestaltung der Kraftstoff-Einspritzpumpe nach Anspruch 2 wird eine einfache Befestigung des Sicherungsringes vorgeschlagen und mit Anspruch 3 wird dessen günstige Herstellung aufgezeigt.Advantageous developments of the invention are described in the subclaims. With the design of the fuel injection pump according to claim 2, a simple attachment of the locking ring is proposed and claim 3 shows its inexpensive manufacture.

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und der folgenden Beschreibung näher erläutert. Es zeigen jeweils in natürlicher Größe :

  • Figur 1 einen Diagonalschnitt durch eine Kraftstoff-Einspritzpumpe gemäß Schnitt I-I in Figur 2 ;
  • Figur 2 einen Axialschnitt im Förderbereich der Pumpe nach Schnitt 11-11 in Figur 1 ; und
  • Figur 3 den Stößel in raumbildlicher Darstellung.
An embodiment of the invention is shown in the drawing and explained in more detail in the following description. They each show in natural size:
  • 1 shows a diagonal section through a fuel injection pump according to section II in Figure 2;
  • FIG. 2 shows an axial section in the delivery area of the pump according to section 11-11 in FIG. 1; and
  • Figure 3 shows the plunger in a spatial representation.

Beschreibung des AusführungsbeispielesDescription of the embodiment

Eine Kraftstoff-Einspritzpumpe ist als Radialkolbenpumpe ausgeführt mit einer im Pumpengehäuse 10 befestigten Buchse 11, in der in ein von einer nicht gezeichneten Welle angetriebener Schieber 12 drehbar und axial verschiebbar gelagert ist. Ein Nockenring 13 hat mehrere nach innen gerichtete Nocken 14 und wird über einen Flansch 15 ebenfalls von der Welle angetrieben. Mehrere Dosierbohrungen 31 sind in der Buchse 11 radial angeordnet, und eine Versorgungsnut 33 im Schieber 12 verbindet jeweils eine Dosierbohrung 31 mit dem Hubraum 32 einer jeden Bohrung 8. Ebenso verbindet nacheinander eine Verteilernut im Schieber 12 den Hubraum 32 mit einem Stichkanal, der Verbindung mit nicht dargestellten Einspritzdüsen hat.A fuel injection pump is designed as a radial piston pump with a bushing 11 fastened in the pump housing 10, in which bush 11 is rotatably and axially displaceably mounted in a slide 12 driven by a shaft, not shown. A cam ring 13 has a plurality of inwardly directed cams 14 and is also driven by the shaft via a flange 15. A plurality of metering bores 31 are arranged radially in the bushing 11, and a supply groove 33 in the slide 12 connects a metering bore 31 with the displacement 32 of each bore 8. Likewise, a distributor groove in the slide 12 connects the displacement 32 with a branch channel, the connection with injector, not shown.

Insgesamt vier Kolben 16 führen sich jeweils in einer radialen Bohrung 8 der Buchse 11. Ebenfalls vier zu den Kolben 16 koaxiale Stößel 9 sind jeweils in Bohrungen 17 der Buchse 11 geführt und weisen einen Hohlzylinder 20 und einen Boden 18 mit einer Nut 19 auf. In dieser ist eine Rolle 21 drehbar gelagert, wobei der Querschnitt der Nut 19 ein Kreisflächenabschnitt mit gleichem Radius wie der Rolle 21 ist und die Tiefe der Nut 19 größer ist als der Radius des Kreisflächenabschnittes.A total of four pistons 16 each run in a radial bore 8 of the bushing 11. Four plungers 9, which are coaxial with the pistons 16, are each guided in bores 17 of the bushing 11 and have a hollow cylinder 20 and a base 18 with a groove 19. In this a roller 21 is rotatably mounted, the cross section of the groove 19 being a circular surface section with the same radius as the roller 21 and the depth of the groove 19 being greater than the radius of the circular surface section.

Eine Schraubenfeder 22 stützt sich zum einen auf der Buchse 11 und zum anderen an einem Federteller 23 ab, der im Kolben 16 eingesprengt ist. Dadurch wird der Kolben 16 an die Innenseite des Stößels 9 gedrückt, so daß die Rolle 21 stets an der Laufbahn 24 des Nockenriqges 13 anliegt.A coil spring 22 is supported on the one hand on the bushing 11 and on the other hand on a spring plate 23 which is blown into the piston 16. As a result, the piston 16 is pressed against the inside of the tappet 9, so that the roller 21 is always in contact with the raceway 24 of the cam lever 13.

Ein Sicherungsring 25 aus Metallblech ist an einer Nabe 26 mittels eines Sprengringes 27 befestigt und hat mehrere Finger 28, die bezüglich dem Schieber 12 axial gerichtet sind. In der Stirnseite des Hohlzylinders 20 des Stößels 9 ist ein Langloch 29 parallel zur Hubrichtung angeordnet, und in der Stirnfläche der Buchse 11 sind insgesamt vier Druchbrüche 30 derart angeordnet, daß je ein Durchbruch 30 mit einem Langloch 29 korrespondiert, so daß ein Finger 28 des Sicherungsringes 25 durch den Durchbruch 30 hindurch in das Langloch 29 eingreift.A locking ring 25 made of sheet metal is fastened to a hub 26 by means of a snap ring 27 and has a plurality of fingers 28 which are axially directed with respect to the slide 12. In the end face of the hollow cylinder 20 of the plunger 9, an elongated hole 29 is arranged parallel to the stroke direction, and in the end face of the bush 11 a total of four openings 30 are arranged such that an opening 30 corresponds to an elongated hole 29, so that a finger 28 of the Circlip 25 engages through the opening 30 in the slot 29.

Der Stößel 9 in Figur 3 hat den Boden 18 mit der Nut 19 und den Hohlzylinder 20. In diesem sind zwei Langlöcher 29 an zwei diametralen Stellen ausgebildet, wobei die Längsausdehnung eines jeden Langloches 29 in Hubrichtung angeordnet ist.The plunger 9 in FIG. 3 has the base 18 with the groove 19 and the hollow cylinder 20. In this, two elongated holes 29 are formed at two diametrical locations, the longitudinal extent of each elongated hole 29 being arranged in the stroke direction.

Claims (4)

1. Fuel injection pump with a rotating distributor for distributing the fuel to the nozzles, and with a rotating cam ring which imparts a pump stroke to pistons guided radially in a housing, counter to the force of a spring arranged on the housing, via a plunger for each piston, characterised in that the plunger (9) has a hollow cylinder (20) which is guided in a bore (17) of the housing (10) and which receives the spring (22), in that a perforation (30) is arranged in the housing (10) and a slot (29) matching the perforation (30) is arranged in the hollow cylinder (20) parallel to the stroke direction of the piston (16), and in that an axial finger (28) of a retaining ring (25) fastened to the housing (10) engages through the perforation (30) into the slot (29).
2. Pump according to Claim 1, characterised in that the retaining ring (25) is fixed in its functional position on a hub (26) of the housing (10).
3. Pump according to Claim 1 or 2, characterised in that the retaining ring (25) consists of sheet metal and is produced by means of draw- punching.
4. Pump according to one of the preceding claims, characterised in that a spring plate (23) is snapped into the outer casing of the piston (16) and near the bottom (18) of the plunger (9).
EP82107463A 1981-09-04 1982-08-17 Fuel-injection pump Expired EP0073968B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3135045 1981-09-04
DE3135045 1981-09-04
DE3146625 1981-11-25
DE19813146625 DE3146625A1 (en) 1981-09-04 1981-11-25 FUEL INJECTION PUMP

Publications (2)

Publication Number Publication Date
EP0073968A1 EP0073968A1 (en) 1983-03-16
EP0073968B1 true EP0073968B1 (en) 1985-06-05

Family

ID=25795782

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82107463A Expired EP0073968B1 (en) 1981-09-04 1982-08-17 Fuel-injection pump

Country Status (3)

Country Link
US (1) US4486154A (en)
EP (1) EP0073968B1 (en)
DE (2) DE3146625A1 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59203863A (en) * 1983-05-04 1984-11-19 Nissan Motor Co Ltd Fuel injection pump for fuel injection type internal- combustion engine
GB8410280D0 (en) * 1984-04-19 1984-05-31 Lumber P M P Rotary distributor pump
DE3437973A1 (en) * 1984-10-17 1986-04-17 Robert Bosch Gmbh, 7000 Stuttgart FUEL INJECTION PUMP FOR INTERNAL COMBUSTION ENGINES
DE3816508A1 (en) * 1988-05-14 1989-11-23 Bosch Gmbh Robert FUEL INJECTION PUMP FOR INTERNAL COMBUSTION ENGINE
US5046931A (en) * 1990-07-09 1991-09-10 Allied-Signal Inc. Radial gear driven piston pump
GB9206099D0 (en) * 1992-03-20 1992-05-06 Lucas Ind Plc Fuel pump
DE10041318A1 (en) * 2000-08-23 2002-03-07 Mannesmann Rexroth Ag Hydraulic radial piston machine

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE828325C (en) * 1950-03-04 1952-01-17 Fr Wilh Deckel Dipl Ing Injection pump for internal combustion engines

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2243861A (en) * 1938-05-12 1941-06-03 Richard W Hautzenroeder Apparatus for supplying fuel to internal combustion engines
US3138103A (en) * 1961-12-26 1964-06-23 Allis Chalmers Mfg Co Fuel supplying mechanism
FR1384096A (en) * 1963-11-21 1965-01-04 Sigma Improvements to distributor injection pumps for five-cylinder engines
FR2184153A5 (en) * 1972-05-08 1973-12-21 Sigma
US4367714A (en) * 1981-01-19 1983-01-11 Ambac Industries Incorporated Fuel injection pump

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE828325C (en) * 1950-03-04 1952-01-17 Fr Wilh Deckel Dipl Ing Injection pump for internal combustion engines

Also Published As

Publication number Publication date
DE3264049D1 (en) 1985-07-11
DE3146625A1 (en) 1983-03-17
US4486154A (en) 1984-12-04
EP0073968A1 (en) 1983-03-16

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