DE3925823A1 - Injection pump plunger drive - has cam wheel surface of lesser radius than adjacent portion of camshaft - Google Patents

Injection pump plunger drive - has cam wheel surface of lesser radius than adjacent portion of camshaft

Info

Publication number
DE3925823A1
DE3925823A1 DE19893925823 DE3925823A DE3925823A1 DE 3925823 A1 DE3925823 A1 DE 3925823A1 DE 19893925823 DE19893925823 DE 19893925823 DE 3925823 A DE3925823 A DE 3925823A DE 3925823 A1 DE3925823 A1 DE 3925823A1
Authority
DE
Germany
Prior art keywords
cam
camshaft
radius
injection pump
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.)
Withdrawn
Application number
DE19893925823
Other languages
German (de)
Inventor
Dieter Dipl Ing Woschee
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.)
Daimler Benz AG
Original Assignee
Daimler Benz AG
Mercedes Benz 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 Daimler Benz AG, Mercedes Benz AG filed Critical Daimler Benz AG
Priority to DE19893925823 priority Critical patent/DE3925823A1/en
Publication of DE3925823A1 publication Critical patent/DE3925823A1/en
Withdrawn legal-status Critical Current

Links

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
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/10—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
    • F02M59/102—Mechanical drive, e.g. tappets or cams

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

The plunger drive mechanism is for the elements in a row of a fuel-injection pump. having cam operated roller tappets. The camshaft is mounted coaxially in a cylindrical chamber in the pump housing, the radius of the cam humps being slightly less than that of the chamber. The radius (RG) of the cam heel surfaces is less than that of the portions of the shaft adjacent to the cams (5). USE/ADVANTAGE - Injection pump for IC engine allows appreciable increase in quantity and/or pressure of fuel delivered without alterations to the housing.

Description

Die Erfindung betrifft einen Pumpenkolbenantrieb für eine Reiheneinspritzpumpe für Brennkraftmaschinen gemäß den im Oberbegriff des Patentanspruchs 1 angegebenen Merkmalen.The invention relates to a pump piston drive for a Series injection pump for internal combustion engines according to the im The preamble of claim 1 features specified.

Aus der DE-OS 30 26 872 ist ein Pumpenkolbenantrieb be­ kannt, bei dem eine zylindrische Ausnehmung im Pumpenge­ häuse zur Aufnahme eines mit einem Rollenstößel zusammen­ wirkenden Nockens einer Nockenwelle vorgesehen ist. Die Ausnehmung ist so bemessen, daß ihr halber Durchmesser nur geringfügig größer ist als der Kopfkreisradius des für übliche Fördermengen und/oder maximalen Förderdruckes ausgelegten Nockens.From DE-OS 30 26 872 a pump piston drive is be knows, in which a cylindrical recess in the pump housing for holding one together with a roller tappet acting cam of a camshaft is provided. The The recess is dimensioned so that only half its diameter is slightly larger than the tip radius of the for usual delivery rates and / or maximum delivery pressure designed cam.

Der Erfindung liegt die Aufgabe zugrunde, an einer der­ artig ausgeführten kompakten Reiheneinspritzpumpe Maß­ nahmen zu treffen, die eine nennenswerte Steigerung der Fördermenge und/oder des maximalen Förderdrucks ohne bau­ liche Veränderungen eines gegebenen Pumpengehäuses ermög­ lichen. The invention is based, on one of the task well-designed compact in-line injection pump made to measure took to take a significant increase in Delivery rate and / or the maximum delivery pressure without construction changes to a given pump housing lichen.  

Zur Lösung der Aufgabe dienen erfindungsgemäß die im Kennzeichen des Patentanspruchs 1 angegebenen Merkmale.According to the invention serve to solve the problem Characteristics of claim 1 specified features.

Durch die besondere Ausgestaltung des Nockens zu den be­ nachbarten Wellenteilen der Nockenwelle ergibt sich ein vergrößerter Nockenhub ohne entsprechende Vergrößerung des Pumpengehäuses und ohne Schwächung der Welle.Due to the special design of the cam to be neighboring shaft parts of the camshaft result increased cam stroke without a corresponding increase in the Pump housing and without weakening the shaft.

In den Unteransprüchen sind noch förderliche Weiterbil­ dungen beansprucht, wobei die Ausführung gemäß Anspruch 3 den Vorteil hat, daß bei Erfordernis, wenn der Einstich in der Welle mit Rücksicht auf den Stößel breiter ausgeführt werden muß als der Nocken ist, dieser Einstich durch eine partielle Verstärkung der Welle seitlich des Nockens kom­ pensiert werden kann.In the subclaims there are still helpful further developments claims, wherein the embodiment according to claim 3 has the advantage that if necessary when the puncture in the shaft is wider with respect to the tappet must be than the cam is, this puncture by a partial reinforcement of the shaft on the side of the cam com can be penalized.

Die Erfindung ist anhand eines in der Zeichnung veran­ schaulichten Ausführungsbeispiels näher erläutert. Es zeigen:The invention is based on one in the drawing clear exemplary embodiment explained in more detail. It demonstrate:

Fig. 1 den Pumpenkolbenantrieb einer Reihenein­ spritzpumpe im Schnitt Fig. 1 shows the pump piston drive of a series injection pump in section

Fig. 2 einen Teil der Nockenwelle des Pumpenkol­ benantriebs. Fig. 2 benantriebs a part of the camshaft of the Pumpenkol.

Bei einem in Fig. 1 dargestellten Pumpenkolbenantrieb 1 einer Reiheneinspritzpumpe 2 ist einer zylindrischen Ausnehmung 3 im Pumpengehäuse 4 der Nocken 5 einer Nockenwelle 6 koaxial zugeordnet, wobei der Kopfkreisra­ dius R K des Nockens 5 geringfügig kleiner ist als der halbe Durchmesser D A der zylindrischen Ausnehmung 3. Die Nockenwelle 6 ist mit einem Einstich 7 (Fig. 2) versehen, durch den der Grundkreisradius R G des Nockens 5 verklei­ nert ist, jedoch gleichzeitig der Nockenhub H vergrößert ist, so daß sich eine beträchtliche Steigerung der För­ dermenge und/oder des maximalen Förderdrucks bei gleicher Hubgeschwindigkeit zu Förderbeginn ergibt. Der Durchmesser D W der sich an den Nocken 5 anschließenden Wellenteile 8, 9 der Nockenwelle 6 bleibt unverändert, so daß trotz Ver­ größerung des Nockenhubes keine unzulässige Schwächung der Nockenwelle 6 eintritt.In a pump piston drive 1 of an in-line injection pump 2 shown in FIG. 1, a cylindrical recess 3 in the pump housing 4 is coaxially assigned to the cam 5 of a camshaft 6 , the tip circle radius R K of the cam 5 being slightly smaller than half the diameter D A of the cylindrical recess 3rd The camshaft 6 is provided with a recess 7 ( FIG. 2) through which the base circle radius R G of the cam 5 is reduced, but at the same time the cam stroke H is increased, so that there is a considerable increase in the quantity and / or the maximum Delivery pressure at the same stroke speed at the start of delivery. The diameter D W of the shaft parts 8 , 9 of the camshaft 6 adjoining the cam 5 remains unchanged, so that, despite the increase in the cam stroke, no undue weakening of the camshaft 6 occurs.

Der Grundkreisradius R G des Nockens 5 ist dabei kleiner als die Differenz zwischen Grundkreisradius R G und Kopf­ kreisradius R K . Der Nocken 5 erstreckt sich in Umfangs­ richtung über etwa die Hälfte der zylindrischen Ausnehmung 3.The base circle radius R G of the cam 5 is smaller than the difference between the base circle radius R G and tip circle radius R K. The cam 5 extends in the circumferential direction over about half of the cylindrical recess 3rd

Für den Fall, daß der Einstich 7 in der Welle aufgrund des Rollenstößels 10 breiter ausgeführt sein muß als der Nok­ ken 5 ist, kann der Übergang zwischen dem Nocken 5 und den benachbarten Wellenteilen 8, 9 diametral zum Einstich 7 auf den Grundkreis R G verstärkt ausgeführt sein. Die Ver­ stärkung zu beiden Seiten des Nockens 5 ist mit 11, 12 bezeichnet.In the event that the recess 7 in the shaft must be made wider than the Nok ken 5 due to the roller plunger 10 , the transition between the cam 5 and the adjacent shaft parts 8 , 9 can be reinforced diametrically to the recess 7 on the base circle R G be executed. The reinforcement on both sides of the cam 5 is designated 11 , 12 .

Claims (3)

1. Pumpenkolbenantrieb für eine Reiheneinspritzpumpe für Brennkraftmaschinen, mit einem den Pumpenkolben antrei­ benden Rollenstößel, dessen Stößelrolle mit einem Nocken einer Nockenwelle zusammenwirkt, welcher koaxial zu einer zylindrischen Ausnehmung im Pumpengehäuse angeordnet ist, derart, daß der Kopfkreisradius des Nockens geringfügig kleiner ist als der Radius der Ausnehmung, dadurch gekennzeichnet, daß der Grundkreisradius (R G ) des Nockens (5) kleiner ist als der Radius der dem Nocken (5) benachbarten Wellenteile (8, 9) der Nockenwelle (6).1. Pump piston drive for an in-line injection pump for internal combustion engines, with a roller plunger driving the pump piston, the tappet roller cooperating with a cam of a camshaft, which is arranged coaxially to a cylindrical recess in the pump housing, such that the tip radius of the cam is slightly smaller than the radius of the recess, characterized in that the base circle radius ( R G ) of the cam ( 5 ) is smaller than the radius of the shaft parts ( 8 , 9 ) of the camshaft ( 6 ) adjacent to the cam ( 5 ). 2. Pumpenkolbenantrieb nach Anspruch 1, dadurch gekennzeichnet, daß der Grundkreisradius (R G ) des Nockens (5) kleiner als die Differenz zwischen diesem Grundkreisradius (R G ) und dem Kopfkreisradius (R K ) ist. 2. Pump piston drive according to claim 1, characterized in that the base circle radius ( R G ) of the cam ( 5 ) is smaller than the difference between this base circle radius ( R G ) and the tip circle radius ( R K ). 3. Pumpenkolbenantrieb nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Nockenwelle (6) unmittelbar zu beiden Seiten an die Nocke (5) angrenzend etwa diametral zum Einstich (7) auf den Grundkreis Verstärkungsbereiche (11, 12) aufweist.3. Pump piston drive according to claim 1 or 2, characterized in that the camshaft ( 6 ) directly on both sides of the cam ( 5 ) adjacent diametrically to the recess ( 7 ) on the base circle reinforcement areas ( 11 , 12 ).
DE19893925823 1989-08-04 1989-08-04 Injection pump plunger drive - has cam wheel surface of lesser radius than adjacent portion of camshaft Withdrawn DE3925823A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19893925823 DE3925823A1 (en) 1989-08-04 1989-08-04 Injection pump plunger drive - has cam wheel surface of lesser radius than adjacent portion of camshaft

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19893925823 DE3925823A1 (en) 1989-08-04 1989-08-04 Injection pump plunger drive - has cam wheel surface of lesser radius than adjacent portion of camshaft

Publications (1)

Publication Number Publication Date
DE3925823A1 true DE3925823A1 (en) 1990-06-21

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DE19893925823 Withdrawn DE3925823A1 (en) 1989-08-04 1989-08-04 Injection pump plunger drive - has cam wheel surface of lesser radius than adjacent portion of camshaft

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0511679A1 (en) * 1991-04-30 1992-11-04 Isuzu Motors Limited Cam shaft of fuel injection pump
DE4205886B4 (en) * 1992-02-26 2004-07-29 Robert Bosch Gmbh Fuel injection pump for internal combustion engines

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3026872A1 (en) * 1979-08-03 1981-02-19 Lucas Industries Ltd LIQUID FUEL INJECTION PUMP DEVICE
DE2712450C2 (en) * 1977-03-22 1984-08-23 Klöckner-Humboldt-Deutz AG, 5000 Köln Pump piston drive for a fuel injection pump for internal combustion engines

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2712450C2 (en) * 1977-03-22 1984-08-23 Klöckner-Humboldt-Deutz AG, 5000 Köln Pump piston drive for a fuel injection pump for internal combustion engines
DE3026872A1 (en) * 1979-08-03 1981-02-19 Lucas Industries Ltd LIQUID FUEL INJECTION PUMP DEVICE

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0511679A1 (en) * 1991-04-30 1992-11-04 Isuzu Motors Limited Cam shaft of fuel injection pump
US5307781A (en) * 1991-04-30 1994-05-03 Isuzu Motors Limited Cam shaft for fuel injection pump
DE4205886B4 (en) * 1992-02-26 2004-07-29 Robert Bosch Gmbh Fuel injection pump for internal combustion engines

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OAV Applicant agreed to the publication of the unexamined application as to paragraph 31 lit. 2 z1
OP8 Request for examination as to paragraph 44 patent law
8130 Withdrawal