WO2008055745A1 - Transmission par arbre à cames avec stabilisation géométrique du galet de roulement - Google Patents

Transmission par arbre à cames avec stabilisation géométrique du galet de roulement Download PDF

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Publication number
WO2008055745A1
WO2008055745A1 PCT/EP2007/060103 EP2007060103W WO2008055745A1 WO 2008055745 A1 WO2008055745 A1 WO 2008055745A1 EP 2007060103 W EP2007060103 W EP 2007060103W WO 2008055745 A1 WO2008055745 A1 WO 2008055745A1
Authority
WO
WIPO (PCT)
Prior art keywords
roller
cam
camshaft
camshaft drive
cam portion
Prior art date
Application number
PCT/EP2007/060103
Other languages
German (de)
English (en)
Inventor
Walter Fuchs
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 WO2008055745A1 publication Critical patent/WO2008055745A1/fr

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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
    • F02M59/02—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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/0404—Details or component parts
    • F04B1/0413—Cams
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/0404—Details or component parts
    • F04B1/0439—Supporting or guiding means for the pistons

Definitions

  • the present invention relates to a camshaft drive, in particular for a
  • Diesel injection pump according to the preamble of claim 1.
  • the camshaft drive according to the invention is directed in particular to diesel injection pumps for common rail injection systems for diesel internal combustion engines.
  • the published patent application DE 101 38 362 A1 discloses a camshaft drive for a diesel injection pump of a common rail fuel injection system.
  • the camshaft drive comprises a camshaft having an eccentric portion which forms the cam. Over the eccentric section rolls one
  • Tappet roller wherein the plunger roller is rotatably received in a roller shoe, and performs a lifting body with a plunger body.
  • the plunger roller is pressed by means of a compression spring against the eccentric portion of the camshaft.
  • the lifting movement is transmitted to a piston, which cooperates with a valve assembly to compress the fuel.
  • a camshaft drive which comprises a camshaft, which is driven via a crankshaft of an internal combustion engine.
  • the camshaft has a cam over which a roller circumferentially rolls the cam.
  • a lifting movement is generated via the roller, wherein the roller is accommodated in a roller shoe in order to carry out the linear lifting movement.
  • About the stroke thus generated can be compressed using a valve assembly of the fuel.
  • the twisting movement takes place about the lifting axis of the liftable over the cam portion guided components.
  • In an idealized normal operation forms between the roller and the cam portion of the camshaft line contact.
  • the roller can perform a wobble on the cam portion, thereby reducing the force transmission area between the roller and the cam portion.
  • pins or sliding blocks are known, which are for guiding on the ram bodies, in particular in row pumps, i. cam-controlled pumps are provided. These can be mounted both in the plunger body and in the pump housing, so that the sliding block either performs a lifting movement, or is arranged stationary within the housing of the diesel injection pump. An avoidance of the rotation of the plunger is therefore primarily on this Vercardhemmung.
  • the invention includes the technical teaching that the insects may be used to create a Verwarhemmung the roller about the stroke axis in the lower dead center. If the roller now rolls over the cam portion of the camshaft, it can only rotate freely about the stroke axis at top dead center. If the roller rolls over the cam portion, a guided line contact between the roller and the cam portion in the direction of the longitudinal axis of the camshaft is formed by the hollow portion.
  • Pins and sliding blocks according to the known embodiments of VerFhemmept are no longer necessary according to the embodiment of the camshaft drive according to the present invention.
  • retroactive mo- ments which prevent a rotation of the roller tappet.
  • it can lead to torsions, which can be prevented in the Eisennockenrast Scheme over the hollow radius of the invention.
  • a more precise alignment is given at the beginning of the working stroke than a simple Vercardhemmung with a pin or a sliding block.
  • the roller is received in a roller shoe and rotatably mounted therein about a rotational axis, wherein the roller transmits the VerFhemmung about the lifting axis of the roller shoe.
  • the inclusion of the roller in the roller shoe is either via a roller pin or the roller is slidably mounted in the roller shoe, wherein the sliding bearing takes place over the lateral surface of the roller in the roller shoe. Regardless of the type of recording of the roller in the roller shoe this is also secured by the rotation inhibited roller on the interaction with the cam portion in the rotation. Thus ü- transmits the roller the VerFhemmung on the roller shoe.
  • the roller shoe is received in a plunger body, which is secured by the roller over the roller shoe in a rotation about the lifting axis.
  • Roller shoe is received in a plunger body, wherein the roller shoe against the plunger body is rotationally inhibited. This transmits the Vercardhemmung of the roller initially on the roller shoe and thus also on the plunger body.
  • the arrangement of a sliding block, a pin or the like for torsional inhibition is therefore not required on any of the aforementioned components such as the roller, the roller shoe and the plunger body.
  • the roller is pressed by a compression spring against the cam portion, wherein the tortuous compression spring generates a slight torsional movement over the stroke of the roller.
  • the compression spring is designed as a helical compression spring, wherein in the working stroke of a spiral spring, a torsion between the adjacent to the spring in the axial direction components is generated.
  • the rotation-inhibited arrangement of the roller over the cam portion counteracts the torsion of the compression spring, so that it does not interfere with its appearance.
  • distortions of the lift-moveable components can caused by tolerances, vibrations or other discontinuities in the cam gear, which do not interfere.
  • the hollow radius has a value of 30 mm to 500 mm, wherein the value of the hollow radius in the intermediate cam detent region is dependent on the diameter of the camshaft itself.
  • the roller can have a diameter of for example 5mm to 25mm.
  • the radius of curvature should be at least so small that the curvature within the Eisenlocken-latching area is sufficiently large to stabilize the roller in the rotation about the lifting axis. The smaller the difference between the hollow radius of the
  • camshaft drives in which one, three, four or more than four cams are arranged over the circumference of the cam section, between each of which an intermediate cam detent region extends.
  • geometric hollow radii are formed between the cams, which exert the stabilizing effect on the roller.
  • Figure 2 is a schematic representation of a camshaft drive according to the present invention, wherein the roller rolls in the illustrated form over the Eisennockenrast Scheme, and the cam portion has two cams, between which two opposing embnockenrast Schemee are formed.
  • the camshaft drive shown in Figure 1 is provided with the reference numeral 1.
  • a camshaft 3 is rotatably received, wherein the axis of rotation of the camshaft 3 is indicated by the camshaft longitudinal axis 2.
  • the camshaft 3 has a cam portion 4, which is arranged between two bearing points of the camshaft 3.
  • the cam portion 4 comprises two cams 5, which are indicated in the image plane at the upper end and at the lower end of the illustrated cam portion 4. Between the two cams 5, a confirmednockenrast Scheme 8 is indicated, which is delimited by two light edges schematically against the cam 5.
  • a hollow radius is formed, which causes a curvature of the cam portion 4 in the direction of the centrally extending camshaft longitudinal axis 2.
  • a roller 7 rolls over the cam section 4, the roller 7 being accommodated within a roller shoe 9.
  • the roller shoe 9 is in turn arranged within a tappet body 10, which is guided in a cylinder bore of the housing of the camshaft drive 1 in a liftable manner.
  • the lifting movement which run the roller 7, the roller shoe 9 and the plunger body 10, along a lifting axis 6.
  • the lifting axle 6 extends perpendicular to the camshaft longitudinal axis 2.
  • a compression spring 11 presses the roller 7 via the plunger body 10 and the
  • FIG. 2 shows the camshaft drive 1 in a schematic representation. The representation is shown from the direction of view of the camshaft longitudinal axis 2, so that the cam 5 formed within the cam portion are indicated. Between the cams 5 extend 90 ° offset from the cams 5 two embnockenrast Schemee 8.
  • the insects 5 are characterized by a hollow radius R, wherein the roller 7 rolls over one of the two embnockenrast Schemee 8 in the illustrated form.
  • the roller 7 is stabilized about the lifting axis 6, the stabilized roller 7 interacting with the roller shoe 9 and the plunger body 10.
  • the roller 7 is rotationally fixed to the roller shaft 6 connected to the roller shoe 9, which in turn is rotationally connected to the plunger body 10.
  • a compression spring 11 presses the unit consisting of the roller 7, the roller shoe 9 and the plunger body 10 against the cam portion 4 of the camshaft third
  • the hollow radius R which is shown only schematically in FIG. 2, can have a value of 30 mm to 500 mm, wherein the roller 7 can have a diameter of, for example, 5 mm to 25 mm.
  • the lifting movement of the unit from the roller 7, the roller shoe 9 and the plunger body 10 is schematically indicated by a double arrow. Further, the rotation of the camshaft 3 is indicated by a rotating arrow about the camshaft longitudinal axis 2.
  • the cross-sectionally cross-hatched roller shoe 9 encloses according to the present illustration, the roller 7, which does not have to be guided directly within the roller shoe 9, but can be rotatably received via a roller bolt 7 arranged centrally to the roller.
  • the invention is not limited in its execution to the above-mentioned preferred embodiment. Rather, a number of variants are conceivable, which make use of the illustrated solution even in fundamentally different embodiments.

Landscapes

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

Abstract

Transmission (1) par arbre à cames, en particulier pour une pompe d'injection de moteur diesel, avec un arbre à cames (3) monté à rotation autour d'un axe longitudinal (2) d'arbre à cames et pourvu d'au moins une came (5) configurée dans une partie de came (4). Un galet de roulement (7) guidé suivant un axe de translation (6) roule sur la partie de came (4). Dans un mouvement de translation sur la partie de came (4), le galet de roulement (7) prend une position de point mort haut sur la came (5) et une position de point mort bas sur au moins une région (8) de crantage de came intermédiaire. La région (8) de crantage de came intermédiaire comprend un rayon creux (R) afin de créer un blocage en rotation du galet de roulement (7) autour de l'axe de translation (6). On fournit ainsi une transmission (1) par arbre à cames qui présente, dans une exécution sans moyens de guidage, un blocage en rotation du galet de roulement (7) ainsi que des éléments mobiles en translation qui se trouvent en liaison fonctionnelle avec le galet de roulement (7).
PCT/EP2007/060103 2006-11-07 2007-09-24 Transmission par arbre à cames avec stabilisation géométrique du galet de roulement WO2008055745A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200610052484 DE102006052484A1 (de) 2006-11-07 2006-11-07 Nockenwellentrieb mit einer geometrischen Laufrollenstabilisierung
DE102006052484.5 2006-11-07

Publications (1)

Publication Number Publication Date
WO2008055745A1 true WO2008055745A1 (fr) 2008-05-15

Family

ID=38992653

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2007/060103 WO2008055745A1 (fr) 2006-11-07 2007-09-24 Transmission par arbre à cames avec stabilisation géométrique du galet de roulement

Country Status (2)

Country Link
DE (1) DE102006052484A1 (fr)
WO (1) WO2008055745A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008041934A1 (de) 2008-09-10 2010-03-11 Robert Bosch Gmbh Nockenwelle, insbesondere für eine Kolbenpumpe
DE102008043432A1 (de) * 2008-11-04 2010-05-06 Robert Bosch Gmbh Kolbenpumpe mit einer Antriebswelle mit optimiertem Dreifachnocken
DE102010043357A1 (de) 2010-11-04 2012-05-10 Man Diesel & Turbo Se Rollenstößel und Rollenbolzen für einen Rollenstößel
DE102010063363A1 (de) * 2010-12-17 2012-06-21 Robert Bosch Gmbh Hochdruckpumpe
DE102015202755A1 (de) * 2015-02-16 2016-08-18 Mahle International Gmbh Gebaute Betätigungswelle

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0501463A2 (fr) * 1991-02-27 1992-09-02 Nippondenso Co., Ltd. Système d'injection de carburant avec distributeur pour un moteur
EP0516196A2 (fr) * 1988-11-24 1992-12-02 Nippondenso Co., Ltd. Pompe à haute pression à écoulement variable
JPH06346814A (ja) * 1993-06-03 1994-12-20 Hino Motors Ltd ディーゼルエンジンの燃料噴射装置
EP1270929A1 (fr) * 2000-03-14 2003-01-02 Bosch Automotive Systems Corporation Pompe a combustible et dispositif d'alimentation en combustible utilisant cette pompe
WO2005038234A1 (fr) * 2003-10-16 2005-04-28 Delphi Technologies, Inc. Pompe a carburant comportant de multiples cames

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0516196A2 (fr) * 1988-11-24 1992-12-02 Nippondenso Co., Ltd. Pompe à haute pression à écoulement variable
EP0501463A2 (fr) * 1991-02-27 1992-09-02 Nippondenso Co., Ltd. Système d'injection de carburant avec distributeur pour un moteur
JPH06346814A (ja) * 1993-06-03 1994-12-20 Hino Motors Ltd ディーゼルエンジンの燃料噴射装置
EP1270929A1 (fr) * 2000-03-14 2003-01-02 Bosch Automotive Systems Corporation Pompe a combustible et dispositif d'alimentation en combustible utilisant cette pompe
WO2005038234A1 (fr) * 2003-10-16 2005-04-28 Delphi Technologies, Inc. Pompe a carburant comportant de multiples cames

Also Published As

Publication number Publication date
DE102006052484A1 (de) 2008-05-08

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