EP0202451B1 - Fuel injection pump for internal-combustion engines - Google Patents

Fuel injection pump for internal-combustion engines Download PDF

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Publication number
EP0202451B1
EP0202451B1 EP86104864A EP86104864A EP0202451B1 EP 0202451 B1 EP0202451 B1 EP 0202451B1 EP 86104864 A EP86104864 A EP 86104864A EP 86104864 A EP86104864 A EP 86104864A EP 0202451 B1 EP0202451 B1 EP 0202451B1
Authority
EP
European Patent Office
Prior art keywords
roller ring
injection pump
fuel injection
area
housing
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
EP86104864A
Other languages
German (de)
French (fr)
Other versions
EP0202451A1 (en
Inventor
Siegfried Haberland
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 EP0202451A1 publication Critical patent/EP0202451A1/en
Application granted granted Critical
Publication of EP0202451B1 publication Critical patent/EP0202451B1/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
    • F02M41/08—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined
    • F02M41/10—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined pump pistons acting as the distributor
    • F02M41/12—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined pump pistons acting as the distributor the pistons rotating to act as the distributor
    • F02M41/123—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined pump pistons acting as the distributor the pistons rotating to act as the distributor characterised by means for varying fuel delivery or injection timing
    • F02M41/128—Varying injection timing by angular adjustment of the face-cam or the rollers support
    • 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
    • F02M41/08—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined
    • F02M41/10—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined pump pistons acting as the distributor
    • F02M41/12—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined pump pistons acting as the distributor the pistons rotating to act as the distributor
    • F02M41/121—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined pump pistons acting as the distributor the pistons rotating to act as the distributor with piston arranged axially to driving shaft
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/18—Mechanical movements
    • Y10T74/18024—Rotary to reciprocating and rotary

Definitions

  • the invention relates to a fuel injection pump for internal combustion engines according to the preamble of claim 1.
  • a known fuel injection pump of this type (DE-B-1 263 397) the support part, which is rotatably supported as a ring, has a plurality of support parts in its support surface for receiving fuel as a lubricant of depressions arranged in the manner of a waffle pattern. Since the fuel penetrating into the depressions remains enclosed, the lubricity is very sensitive to dirt. Furthermore, the load-bearing portion of the support surface is considerably reduced by the total area of the depressions.
  • the fuel injection pump according to the invention with the characterizing features of claim 1 has the advantage that better lubrication and thus better sliding of the roller ring on the support member is achieved by a better supply of fuel in the area.
  • By flooding the radial grooves the sliding effect is insensitive to dirt.
  • the supporting surface of the support ring is increased by a lower removal on the support surface of the support ring, so that a low surface pressure is present.
  • FIG. 1 shows a fuel distributor injection pump for internal combustion engines in a simplified side view, partly in section
  • FIG. 2 shows the distributor injection pump according to FIG. 1 in cross section in the plane 11-11 of FIG. 1
  • FIG. 3 shows a detail 111 of FIG. 1 in an enlarged view.
  • a drive shaft 11 is rotatably mounted, which rotates a lifting disk 13 and a distributor piston 14 via a cross slide clutch 12.
  • the drive shaft 11 carries a gear 16 meshing with a pinion 15 of a speed controller and a rotor 17 of a feed pump 18 delivering fuel into the interior of the housing 10.
  • the annular stator 19 of the feed pump 18 is fixed in a recess in the housing 10 used.
  • the lifting disk 13 For superimposing a lifting movement of the rotary movement of the distributor piston 14, the lifting disk 13 has cams 21 on its surface facing the cross slide clutch 12, which rest on rollers 22 of a roller ring 23 surrounding the cross slide clutch 12 and the gear 16.
  • the roller ring 23 is rotatably supported by a certain angular amount in a cylindrical recess 24 in the housing 10 which is open to the speed controller with the pinion 15.
  • the roller ring 23 has an arcuate ablation 25, through which the pinion 15 meshing with the gear 16 engages.
  • the four diagonally arranged rollers 22 are arranged in an axial groove 26 of the roller ring 23 open against the lifting disk 13 and are rotatably mounted on bolts 27 which lie in axial, radially extending recesses 28.
  • a radially protruding bolt 31 is inserted in the roller ring on the side opposite to the removal 25 and engages through a breakthrough 32 in the housing 10 in a ball sleeve 33 of an adjusting piston 34.
  • the roller ring 23 is rotated by the bolt 31 through an angular amount or less in the recess 24, so that the stroke of the distributor piston 14 is phase-adjusted.
  • the roller ring 23 lies axially with its end support surface 37 on the facing side of the disk-shaped support ring 36.
  • the annular support surface 37 is very narrow by a recess for receiving the gear 16 and is interrupted in the area of the removal 25.
  • the support ring 36 has in its side facing the support surface 37 of the roller ring 23 a plurality of radially extending grooves 38 at regular intervals.
  • the grooves 38 are preferably spaced 10 degrees apart, are approximately 0.5 mm wide and 0.5 mm deep.
  • the roller ring 23 has a chamfer or a shoulder 39 in the region of its support surface 37, which forms a drainage channel for the fuel together with the housing 10 and the support ring 36.

Landscapes

  • 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 betrifft eine Kraftstoffeinspritzpumpe für Brennkraftmaschinen nach der Gattung des Anspruchs 1. Bei einer bekannten Kraftstoffeinspritzpumpe dieser Art (DE-B-1 263 397) hat das den Rollenring verdrehbar abstützende als Ring ausgebildete Stützteil in seiner Stützfläche zum Aufnehmen von Kraftstoff als Schmiermittel eine Vielzahl von nach Art eines Waffelmusters angeordneten Vertiefungen. Da der in die Vertiefungen eindringende Kraftstoff eingeschlossen bleibt, ist die Schmierfähigkeit sehr schmutzempfindlich. Ferner wird durch die Gesamtfläche der Vertiefungen der tragende Anteil der Stützfläche erheblich herabgesetzt.The invention relates to a fuel injection pump for internal combustion engines according to the preamble of claim 1. In a known fuel injection pump of this type (DE-B-1 263 397) the support part, which is rotatably supported as a ring, has a plurality of support parts in its support surface for receiving fuel as a lubricant of depressions arranged in the manner of a waffle pattern. Since the fuel penetrating into the depressions remains enclosed, the lubricity is very sensitive to dirt. Furthermore, the load-bearing portion of the support surface is considerably reduced by the total area of the depressions.

Vorteile der ErfindungAdvantages of the invention

Die erfindungsgemäße Kraftstoffeinspritzpumpe mit den kennzeichnenden Merkmalen des Anspruchs 1 hat demgegenüber den Vorteil, daß durch eine bessere Zuführung von Kraftstoff in den Bereich der Stützfläche eine bessere Schmierung und damit ein besseres Gleiten des Rollenringes auf dem Stützteil erzeilt wird. Durch ein Durchfluten der radialen Nuten ist die Gleitwirkung gegenüber Schmutz unempfindlich. Ferner wird durch eine geringere Abtragung auf der Stützfläche des Stützringes die tragende Fläche des Stützringes heraufgesetzt, so daß eine geringe Flächenpressung vorhanden ist.The fuel injection pump according to the invention with the characterizing features of claim 1 has the advantage that better lubrication and thus better sliding of the roller ring on the support member is achieved by a better supply of fuel in the area. By flooding the radial grooves, the sliding effect is insensitive to dirt. Furthermore, the supporting surface of the support ring is increased by a lower removal on the support surface of the support ring, so that a low surface pressure is present.

Vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen beschrieben. Bei der Ausgestaltung nach Anspruch 2, bei der die Schmierrillen als Nuten mit rechteckigem Querschnitt ausgebildet sind, ergibt sich eine besonders gute Durchflutung mit Kraftstoff bei geringster Minderung des tragenden Anteils der Stüsfläche des Stützringes.Advantageous developments of the invention are described in the subclaims. In the embodiment according to claim 2, in which the lubrication grooves are formed as grooves with a rectangular cross-section, there is a particularly good flow of fuel with the least reduction in the load-bearing portion of the support surface of the support ring.

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und in der folgenden Beschreibung näher erläutert. Es zeigen Figur 1 eine Kraftstoffverteilereinspritzpumpe für Brennkraftmaschinen vereinfacht in Seiteneinsicht teilweise geschnitten, Figur 2 die Verteilereinspritzpumpe nach Figur 1 im Querschnitt in der Ebene 11-11 der Figur 1 und Figur 3 eine Einzelheit 111 der Figur 1 in vergrößerter Darstellung.An embodiment of the invention is shown in the drawing and explained in more detail in the following description. 1 shows a fuel distributor injection pump for internal combustion engines in a simplified side view, partly in section, FIG. 2 shows the distributor injection pump according to FIG. 1 in cross section in the plane 11-11 of FIG. 1, and FIG. 3 shows a detail 111 of FIG. 1 in an enlarged view.

Beschreibung des AusführungsbeispielsDescription of the embodiment

In einem Gehäuse 10 der Kraftstoffeinspritzpumpe ist eine Antriebswelle 11 drehbar gelagert, die über eine Kreuzschieberkupplung 12 eine Hubscheibe 13 und einen Verteilerkolben 14 in Drehung versetzt. Im Bereich ihres abtriebseitigen Endes trägt die Antriebswelle 11 ein mit einem Ritzel 15 eines Drehzahlreglers kämmendes Zahnrad 16 und einen Rotor 17 einer Kraftstoff in das Innere des Gehäuses 10 fördernden Förderpumpe 18. Der ringförmige Stator 19 der Förderpumpe 18 ist in einer Ausnehmung des Gehäuses 10 fest eingesetzt.In a housing 10 of the fuel injection pump, a drive shaft 11 is rotatably mounted, which rotates a lifting disk 13 and a distributor piston 14 via a cross slide clutch 12. In the area of its output end, the drive shaft 11 carries a gear 16 meshing with a pinion 15 of a speed controller and a rotor 17 of a feed pump 18 delivering fuel into the interior of the housing 10. The annular stator 19 of the feed pump 18 is fixed in a recess in the housing 10 used.

Zum Überlagern einer Hubbewegung der Drehwegung des Verteilerkolbens 14 hat die Hubscheibe 13 auf ihrer der Kreuzschieberkupplung 12 zugewandten Fläche Nocken 21, die auf Rollen 22 eines die Kreuzschieberkupplung 12 und das Zahnrad 16 umgebenden Rollenringes 23 aufliegen. Der Rollenring 23 ist um einen bestimmten Winkelbetrag in einer zylindrischen Aussparung 24 des Gehäuses 10 drehbar gelagert, die zum Drehzahlregler mit dem Ritzel 15 hin geöffnet ist. In diesem Bereich hat der Rollenring 23 eine bogenförmige Abtragung 25, durch die das mit dem Zahnrad 16 kämmende Ritzel 15 greift. Die vier diagonal angeordneten Rollen 22 sind in einer gegen die Hubscheibe 13 offenen Axialnut 26 des Rollenringes 23 angeordnet und drehbar auf Bolzen 27 gelagert, die in axialen, sich radial erstreckenden Aussparungen 28 liegen. Zum Verdrehen des Rollenringes 23 ist in diesen auf der der Abtragung 25 gegenüberliegenden Seite ein radial abstehender Bolzen 31 eingesetzt, der durch einen Durchbruch 32 im Gehäuse 10 in eine Kugelhülse 33 eines Verstellkolbens 34 greift. Je nach Druckbeaufschlagung des Verstellkolbens 34 wird der Rollenring 23 über den Bolzen 31 um einen oder weniger großen Winkelbetrag in der Aussparung 24 verdreht, so daß der Hub des Verteilerkolbens 14 phasenverstellt wird.For superimposing a lifting movement of the rotary movement of the distributor piston 14, the lifting disk 13 has cams 21 on its surface facing the cross slide clutch 12, which rest on rollers 22 of a roller ring 23 surrounding the cross slide clutch 12 and the gear 16. The roller ring 23 is rotatably supported by a certain angular amount in a cylindrical recess 24 in the housing 10 which is open to the speed controller with the pinion 15. In this area, the roller ring 23 has an arcuate ablation 25, through which the pinion 15 meshing with the gear 16 engages. The four diagonally arranged rollers 22 are arranged in an axial groove 26 of the roller ring 23 open against the lifting disk 13 and are rotatably mounted on bolts 27 which lie in axial, radially extending recesses 28. For rotating the roller ring 23, a radially protruding bolt 31 is inserted in the roller ring on the side opposite to the removal 25 and engages through a breakthrough 32 in the housing 10 in a ball sleeve 33 of an adjusting piston 34. Depending on the pressurization of the adjusting piston 34, the roller ring 23 is rotated by the bolt 31 through an angular amount or less in the recess 24, so that the stroke of the distributor piston 14 is phase-adjusted.

Die vom Verteilerkolben 14 durch nicht dargestellte Rückholfedern belastete Hubscheibe 13 drückt den Rollenring 23 axial gegen einen Stützring 36, der ebenfalls in der Aussparung 24 des Gehäuses 10 eingesetzt ist und am Stator 19 der Förderpumpe 18 anliegt. Der Rollenring 23 liegt mit seiner stirnseitigen Stützfläche 37 axial an der zugewandten Seite des scheibenförmigen Stützringes 36 an. Die ringförmige Stützfläche 37 ist durch eine Aussparung zur Aufnahme des Zahnrades 16 sehr schmal und im Bereich der Abtragung 25 unterbrochen. Um eine gute Schmierung für das Gleiten des Rollenringes 23 auf dem Stützring 36 sicherzustellen, hat der Stützring 36 in seiner der Stützfläche 37 des Rollenrings 23 zugekehrten Seite mehrere radial sich erstreckende Nuten 38 in gleichmäßigen Abständen. Vorzugsweise haben die Nuten 38 einen Abstand von 10 Winkelgraden, sind etwa 0,5 mm breit und 0,5 mm tief. Um ein Durchfluten der Nuten 38 mit Kraftstoff zu gewährleisten, hat der Rollenring 23 im Bereich seiner Stützfläche 37 eine Fase oder einen Absatz 39, der zusammen mit dem Gehäuse 10 und dem Stützring 36 einen Abflußkanal für den Kraftstoff bildet. Durch das Zuführen von Kraftstoff als Schmiermittel in den Bereich der Stützfläche 37 des Rollenringes 23 wird beim Verdrehen des Rollenringes 23 eine gute Schmierung und damit ein leichtes Gleiten des Rollenringes 23 auf dem Stützring 36 erzielt. Durch die relativ schmalen Nuten 38 wird trotz hoher Belastung eine günstige Flächenpressung erreicht.The lifting disk 13, which is loaded by the return piston 14 by return springs, not shown, presses the roller ring 23 axially against a support ring 36, which is also inserted into the recess 24 in the housing 10 and bears against the stator 19 of the feed pump 18. The roller ring 23 lies axially with its end support surface 37 on the facing side of the disk-shaped support ring 36. The annular support surface 37 is very narrow by a recess for receiving the gear 16 and is interrupted in the area of the removal 25. In order to ensure good lubrication for the sliding of the roller ring 23 on the support ring 36, the support ring 36 has in its side facing the support surface 37 of the roller ring 23 a plurality of radially extending grooves 38 at regular intervals. The grooves 38 are preferably spaced 10 degrees apart, are approximately 0.5 mm wide and 0.5 mm deep. In order to ensure that the grooves 38 are flooded with fuel, the roller ring 23 has a chamfer or a shoulder 39 in the region of its support surface 37, which forms a drainage channel for the fuel together with the housing 10 and the support ring 36. By supplying fuel as a lubricant in the region of the support surface 37 of the roller ring 23, good lubrication and thus easy sliding of the roller ring 23 on the roller ring 23 is achieved Support ring 36 achieved. Due to the relatively narrow grooves 38, a favorable surface pressure is achieved despite the high load.

Claims (3)

1. Fuel injection pump for internal combustion engines, particularly a distributor injector pump, having a pumping and distributor member (14) which axially reciprocates in a housing (10) and, at the same time, rotates and which is rotatably connected to a drive shaft (11) via a coupling (12) and carries a cam lifting disc (13), with a roller ring (23) which can be rotated by a particular angle on the same axis as the drive shaft in the housing, in which roller ring several rollers (22) supporting the lifting disc are supported and with a support part (36) which axially supports the roller ring and is provided fixed in location in the housing and in the area of which resting against the roller ring recesses are arranged, characterized in that the recesses are constructed as channels (38) and extend radially with respect to the axis of the support part (36), openings being left free radially inside and outside the area of rest of the roller ring (26).
2. Fuel injection pump according to Claim 1, characterized in that the channels are constructed as grooves (38) having a rectangular cross-section.
3. Fuel injection pump according to Claim 2, characterized in that the roller ring (23) is stepped back in the area of its area (37) resting against the support part (36).
EP86104864A 1985-05-10 1986-04-09 Fuel injection pump for internal-combustion engines Expired EP0202451B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3516867 1985-05-10
DE19853516867 DE3516867A1 (en) 1985-05-10 1985-05-10 FUEL INJECTION PUMP FOR INTERNAL COMBUSTION ENGINES

Publications (2)

Publication Number Publication Date
EP0202451A1 EP0202451A1 (en) 1986-11-26
EP0202451B1 true EP0202451B1 (en) 1988-09-07

Family

ID=6270374

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86104864A Expired EP0202451B1 (en) 1985-05-10 1986-04-09 Fuel injection pump for internal-combustion engines

Country Status (4)

Country Link
US (1) US4679993A (en)
EP (1) EP0202451B1 (en)
JP (1) JP2540304B2 (en)
DE (2) DE3516867A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9611588D0 (en) * 1996-06-04 1996-08-07 Lucas Ind Plc Rotary pump and cam ring therefor
DE19939426A1 (en) * 1999-08-20 2001-03-01 Bosch Gmbh Robert Fuel injection system for an internal combustion engine
JP3906775B2 (en) * 2001-12-18 2007-04-18 株式会社デンソー Distributed fuel injection pump

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3107631A (en) * 1960-06-23 1963-10-22 Balanced drive mechanism for a
US3120811A (en) * 1962-01-29 1964-02-11 Thunderbird Engineering Co Fluid injector pump
DE1234090B (en) * 1963-11-02 1967-02-09 Bosch Gmbh Robert Adjustment device for the start of injection in fuel injection pumps for internal combustion engines
DE1263397B (en) * 1966-12-06 1968-03-14 Bosch Gmbh Robert Fuel injection pump for internal combustion engines
US3381615A (en) * 1966-12-09 1968-05-07 Caterpillar Tractor Co Driving and timing mechanism for fuel injection pump
US3515016A (en) * 1968-07-18 1970-06-02 Minijector Corp Adjustable variable delivery pump
SE7414679L (en) * 1974-11-22 1976-05-24 Atlas Copco Ab DEVICE FOR TRANSFORMING A ROTATING MOVEMENT TO A FORWARD MOVEMENT OR VICE VERSA
US4436163A (en) * 1978-12-13 1984-03-13 Black & Decker Inc. Arrangement for converting rotary motion to reciprocatory motion
JPS5968555A (en) * 1982-10-14 1984-04-18 Nissan Motor Co Ltd Adjusting device of injection timing of fuel injection pump
EP0116165A1 (en) * 1983-01-13 1984-08-22 Franz Orlita Piston pump with rotating piston
JPS613933U (en) * 1984-06-13 1986-01-11 株式会社デンソー Fuel injection timing adjustment device for distribution type fuel injection pump

Also Published As

Publication number Publication date
EP0202451A1 (en) 1986-11-26
US4679993A (en) 1987-07-14
JP2540304B2 (en) 1996-10-02
DE3516867A1 (en) 1986-11-13
JPS61261651A (en) 1986-11-19
DE3660689D1 (en) 1988-10-13

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