EP3529485B1 - Elastomerkeil zwischen der nocke einer hochdruckpumpe und einem motorschwungrad - Google Patents

Elastomerkeil zwischen der nocke einer hochdruckpumpe und einem motorschwungrad Download PDF

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Publication number
EP3529485B1
EP3529485B1 EP17777939.4A EP17777939A EP3529485B1 EP 3529485 B1 EP3529485 B1 EP 3529485B1 EP 17777939 A EP17777939 A EP 17777939A EP 3529485 B1 EP3529485 B1 EP 3529485B1
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EP
European Patent Office
Prior art keywords
crankshaft
cam
engine
actuating cam
connecting ring
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.)
Active
Application number
EP17777939.4A
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English (en)
French (fr)
Other versions
EP3529485A1 (de
Inventor
Jean-Pierre Millon
Ludovic TESSIER
Dimitri BARBEAU
Emmanuel Deruyter
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.)
Renault SAS
Nissan Motor Co Ltd
Original Assignee
Renault SAS
Nissan Motor Co Ltd
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 Renault SAS, Nissan Motor Co Ltd filed Critical Renault SAS
Publication of EP3529485A1 publication Critical patent/EP3529485A1/de
Application granted granted Critical
Publication of EP3529485B1 publication Critical patent/EP3529485B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F02M39/00—Arrangements of fuel-injection apparatus with respect to engines; Pump drives adapted to such arrangements
    • F02M39/02—Arrangements of fuel-injection apparatus to facilitate the driving of pumps; Arrangements of fuel-injection pumps; Pump drives
    • 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
    • F02M59/025—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 a single piston
    • F02M59/027—Unit-pumps, i.e. single piston and cylinder pump-units, e.g. for cooperating with a camshaft
    • 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
    • F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
    • F04B17/05—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by internal-combustion engines
    • 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
    • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
    • F04B9/02—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical
    • F04B9/04—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms
    • F04B9/042—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms the means being cams

Definitions

  • the present invention relates to the field of motor vehicles and relates to a high pressure fuel supply pump.
  • the invention relates more particularly to an arrangement of an activation cam of the high pressure pump, integral in rotation with a crankshaft movable in rotation inside a chamber of connecting rods in a cylinder block.
  • the invention also relates to an internal combustion engine of a motor vehicle comprising a cylinder block surrounding a crankshaft comprising a high pressure fuel pump activation cam fixed to one end of the crankshaft.
  • the invention relates to an internal combustion engine of a motor vehicle comprising a crankshaft movable in rotation about a longitudinal axis of the engine, the fuel of which is supplied to the engine by means of a high pressure pump which replaces a carburetor, said pump being actuated by the rotation of the crankshaft.
  • a high pressure pump is fixed outside the engine block and can be driven indirectly by the crankshaft via a motion transmission system, comprising pulleys and at least one transmission band which can be a chain. or a belt.
  • the high pressure pump is actuated by a cam fixed to a movable shaft in rotation about an axis parallel to the axis of the crankshaft, said shaft is driven in rotation by the crankshaft thanks to a transmission device comprising pulleys substantially coplanar and fixed at the end of the crankshaft and of the movable shaft and a belt surrounding said pulleys.
  • the publication FR3011588-A1 discloses a cam attached coaxially to a motor vehicle heat engine crankshaft to actuate a high pressure heat engine fuel supply pump. Said cam is disposed between two arms of said crankshaft.
  • the pump is conventionally a plate pump which comprises an input shaft driving in rotation a plate which is inclined with respect to the axis and which is capable of stressing the axial pistons mounted to move in chambers into which is admitted and then ejected. fuel.
  • Such a design has the advantage of being more compact than the conventional design, but it nevertheless has the drawback of requiring the provision of a block capable of accommodating an additional shaft, with what this implies in terms of complexity of molding and of additional machining of the block.
  • the document FR2 984 965 -A1 proposes an arrangement of a fuel pump at one end of a camshaft, said pump has a sliding axis coaxial with the axis of the camshaft.
  • the drawback of this type of arrangement is a significant increase in the longitudinal dimension of the engine, which is restrictive for vehicles comprising an engine compartment with reduced dimensions.
  • the publication FR3011588-A1 discloses a high pressure fuel supply pump for a heat engine of a motor vehicle, said pump is actuated by a drive cam fixed integral with and coaxial with the shaft of a crankshaft.
  • a drawback of this type of arrangement is an increase in the size of the heat engine, in particular in the longitudinal direction of the engine, which does not comply with the restrictions on the dimensions of the engine space in vehicles.
  • a particular arrangement of said pump may be orthogonal to the axis of the crankshaft and to a coupling end of said crankshaft facing the coupling face of the heat engine, said end of the crankshaft is coupled in particular with an engine flywheel of which the The object is to reduce the acyclisms of said motor.
  • a drive cam can then be attached to the coupling end of the crankshaft before an attachment point of the flywheel and surrounding the coupling end of the crankshaft.
  • said cam is mounted with a sliding fit.
  • During the operation of the engine it is rotated by the rotation of the crankshaft and is subjected to forces due to the acyclisms of the operation of the engine and to the relative deformations of the associated parts, forces which can cause axial displacement of the cam and in particular vis-à-vis - flywheel screw. It is therefore necessary to have means for holding in position relative of the cam vis-à-vis its neighboring elements of the engine such as the flywheel.
  • the object of the invention is to remedy these problems and one of the objects of the invention is an arrangement of the high pressure fuel supply pump arranged transversely to the axis of the crankshaft and at one end of the crankshaft, said pump being actuated by the rotational movements of the crankshaft via an actuating cam.
  • the object of the invention relates to an arrangement of a cam for actuating the fuel pump at one end of the crankshaft facing the flywheel of the engine while minimizing the size of the engine.
  • the object of the invention relates more particularly to a system for fixing an actuating cam arranged around a crankshaft of a heat engine of a motor vehicle surrounding a crankshaft end bordered by a flywheel, said crankshaft being housed in an engine crankcase, said cam comprising a cylindrical bearing portion extended radially by an oblong plate, characterized in that the cylindrical bearing portion of the slidably mounted cam surrounding the coupling end of the crankshaft carries a connecting ring for maintaining said cam in axial position with the crankshaft.
  • the connecting ring makes it possible to damp the shocks due to the acyclisms of the operation of the engine and makes it possible to maintain the cam in axial position against the flywheel at the end of the crankshaft.
  • the cam is mounted at the coupling end of the crankshaft to optimize the compactness of the engine. It is slidably mounted to allow easy disassembly of the crankshaft, for example during handling in a maintenance workshop. As a result of this sliding assembly, during engine operation, it is subjected to repeated shocks which can cause the cam to slide on the end of the crankshaft, which sliding can therefore cause poor contact when pressing a pump. fuel operated by said cam and therefore poor fuel supply. It is therefore necessary to keep this cam in an axial position with the crankshaft.
  • the connecting ring arranged around the cylindrical bearing part of the actuating cam has a radial face facing the engine flywheel. It therefore makes it possible to separate the actuation cam from the flywheel and to preserve a space between the actuation cam and the engine flywheel.
  • the longitudinal direction X of the engine coplanar and orthogonal with said longitudinal direction X to define a horizontal plane of the vehicle, and a vertical Z direction directed towards the top of the vehicle.
  • the longitudinal direction X is relative to the heat engine which is perpendicular to the longitudinal direction of the vehicle for an engine mounted transversely.
  • the heat engine comprises a fuel supply pump 14 arranged at a coupling end 110 of the engine, said pump being actuated by an actuating cam 15 integral in rotation with the crankshaft 10 and in contact with a flywheel 11.
  • thermal motor vehicle engines comprise a cylinder block 12 comprising at least one cylinder 13 in which a piston (not shown) is able to slide in a reciprocating movement along the axis of said cylinder, and a cylinder head (not shown) covering the upper part of the cylinder block facing the hood of the vehicle.
  • the movements of the piston are driven by a variation of a combustion chamber delimited by the at least one cylinder 13, said piston and a wall of the cylinder head.
  • the at-least one piston is linked to a crankshaft 10 arranged along a substantially horizontal X axis and orthogonal to the vertical Y axis of the at least one cylinder and the reciprocating sliding movements of the at least one piston drives a rotational movement of the crankshaft 10.
  • the sliding movements of the at least one piston are not carried out in a regular manner and produce acyclisms which have repercussions on transmission elements connected to said engine and particularly to the crankshaft.
  • the fuel feed pump 14 for injecting fuel into the combustion chamber via injectors can be a high pressure pump comprising an axis holding at a free end a drive roller resting on a drive surface. Said surface has undulations and is driven in motion by the rotation of the crankshaft.
  • said drive surface is for example a peripheral surface 24 of a plate 23 of substantially oblong shape of the actuating cam 15, which is fixed integral in rotation around its axis to the axis of the crankshaft 10.
  • a particular arrangement of said high pressure pump according to the invention is an arrangement of the high pressure fuel supply pump 14 orthogonally to the horizontal axis X of the crankshaft and to the coupling end 111 of said rotated crankshaft 10. towards the coupling face 110 of the heat engine, said end of the crankshaft is coupled in particular with the flywheel 11 of the engine, the object of which is to reduce the acyclisms of said engine.
  • the crankshaft has an axis with a first end 114 of accessories linked to a toothed wheel (not shown) capable of driving a camshaft pinion and accessory pinions such as a water pump or an air conditioning compressor (not shown) and a second diametrically opposed coupling end 111 connected to the gearbox and on which the flywheel 11 is fixed.
  • a camshaft pinion and accessory pinions such as a water pump or an air conditioning compressor (not shown) and a second diametrically opposed coupling end 111 connected to the gearbox and on which the flywheel 11 is fixed.
  • the actuating cam is fixed to the coupling end of the crankshaft before an attachment point 112 of the flywheel 11.
  • Said actuating cam 15 is rotated by the rotation of the crankshaft 11 and is subjected in particular to forces due to the acyclisms of the operation of the engine and to the relative deformations of the associated parts, forces which can cause radial and axial displacements of the cam and in particular relative to the flywheel.
  • the actuating cam 15 comprises a bearing portion 16 preferably cylindrical adapted to surround the coupling end 111 of the crankshaft 11, said bearing part 16 is extended radially by a substantially oblong plate 23 which comprises the peripheral surface 24 on which a roller of the high pressure pump 14 bears. fuel supply.
  • Said cylindrical bearing portion 16 is separate from the oblong plate 23 and is turned towards the outside of the engine when the actuating cam 15 is mounted on the crankshaft 10 and facing the flywheel 11.
  • This form of cam actuation 15 allows optimum geometric adaptation of the cam according to the geometric constraints of the cylinder block 12.
  • the cylindrical bearing portion 16 allows the connection of the actuating cam with the crankshaft 10 and it carries a substantially annular connecting ring 40 having characteristics of elasticity and flexibility.
  • said ring is made of elastomer, for example EPDM, which is an acronym for ethylene-propylene diene monomer which is an oil-resistant elastomer.
  • EPDM ethylene-propylene diene monomer which is an oil-resistant elastomer.
  • the connecting ring is fixed against a radial end wall 43 of the actuating cam, for example by gluing.
  • the connecting ring 40 therefore has a radial face 41 vis-à-vis the flywheel when the ring is mounted. It thus makes it possible to separate the flywheel 11 and the actuating cam 15.
  • the actuating cam 15 and the connecting ring 30 are housed in a receiving chamber 30 of the cylinder block 12 preferably at a longitudinal end 110 of said cylinder block on the coupling face side.
  • said receiving chamber 30 is separated from a chamber of connecting rods 31 in which the elements of the crankshaft, which are the crank pins 32 and the journals 33, are arranged by an end wall 34 of the cylinder block 12, wall surrounding a crankshaft retaining bearing.
  • the coupling end 111 of the crankshaft thus opens out from the connecting rod chamber 31 by passing through a retaining opening hollowed out in the end wall 34 and surrounding the retaining bearing of said crankshaft, in the receiving chamber 30. Said chamber.
  • a substantially cylindrical wall 35 adapted to surround the drive cam 15 and the connecting ring 40 and which extends longitudinally the cylinder block.
  • Said cylindrical wall 35 may include an orifice (not shown) for the passage of the substantially cylindrical body of the high pressure pump.
  • the actuating cam 15 can have axial movements and come into contact with the flywheel 11.
  • the connecting ring allows said cam 15 to be pushed back to separate it from the flywheel therefore. axial retention of the actuating cam.
  • the cam can also have radial relative displacements.
  • the connecting ring 40 also allows radial retention of the actuating cam. By its elastic characteristics, the connecting ring ensures optimum retention of the drive cam. It also provides shock absorption due to acyclism in engine operation.
  • the actuating cam 15 is mounted around the coupling end 111 of the crankshaft 10 with a sliding adjustment with minimal or ordinary play to allow easy removal of said cam during maintenance or repair phases. engine cleaning requiring disassembly of the crankshaft. In this advantageous way, after removal of the flywheel, it suffices to remove the drive cam by sliding it towards the outside of the crankshaft and then remove the crankshaft.
  • the connecting ring allows axial retention in position of the actuating cam.
  • Said connecting ring makes it possible, with minimal cost, to ensure the maintenance in position of the actuating cam mounted around the coupling end of the crankshaft with a sliding adjustment to facilitate the mechanical dismantling operations, and the damping of the crankshaft. shocks undergone by said cam and ensure a seal of the reception chamber of the cylinder block.
  • the cam may be an oblong plate having a fixing orifice through which the coupling end of said crankshaft passes.
  • the cam may then have a preferably circular groove in which the connecting ring is housed.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)

Claims (5)

  1. System zur Befestigung eines Betätigungsnockens (15), der um eine Kurbelwelle (10) einer Kraftfahrzeugwärmekraftmaschine ein Kopplungsende (111) der Kurbelwelle, das axial durch ein Schwungrad (11) begrenzt wird, umgebend angeordnet ist, wobei die Kurbelwelle in einem Zylinderblock (12) des Motors angeordnet ist, wobei der Betätigungsnocken (15) einen zylindrischen Anlageteil (16) aufweist, der durch eine längliche Platte (23) radial verlängert ist,
    dadurch gekennzeichnet, dass der zylindrische Anlageteil (16) des Betätigungsnockens (15), der das Kopplungsende (111) der Kurbelwelle umgebend gleitend angebracht ist, einen Verbindungsring (40) zum axialen Halten des Nockens mit der Kurbelwelle trägt.
  2. System zur Befestigung eines Betätigungsnockens (15) nach Anspruch 1, dadurch gekennzeichnet, dass der Verbindungsring (40) elastisch ist.
  3. System zur Befestigung eines Betätigungsnockens (15) nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Verbindungsring (40) an einer radialen Endwand (43) des Betätigungsnockens (15) befestigt ist.
  4. System zur Befestigung eines Betätigungsnockens (15) nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass der Verbindungsring (40) aus Elastomer ist.
  5. System zur Befestigung eines Betätigungsnockens (15) nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass der Verbindungsring (40) eine radiale Fläche (41) gegenüber dem Schwungrad (11) aufweist.
EP17777939.4A 2016-10-20 2017-09-14 Elastomerkeil zwischen der nocke einer hochdruckpumpe und einem motorschwungrad Active EP3529485B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1660184A FR3057914B1 (fr) 2016-10-20 2016-10-20 Cale elastomere entre came pompe hp et volant moteur
PCT/FR2017/052450 WO2018073504A1 (fr) 2016-10-20 2017-09-14 Cale elastomere entre came pompe hp et volant moteur

Publications (2)

Publication Number Publication Date
EP3529485A1 EP3529485A1 (de) 2019-08-28
EP3529485B1 true EP3529485B1 (de) 2020-08-05

Family

ID=57583326

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17777939.4A Active EP3529485B1 (de) 2016-10-20 2017-09-14 Elastomerkeil zwischen der nocke einer hochdruckpumpe und einem motorschwungrad

Country Status (3)

Country Link
EP (1) EP3529485B1 (de)
FR (1) FR3057914B1 (de)
WO (1) WO2018073504A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3092877B1 (fr) * 2019-02-19 2021-01-22 Renault Sas "Moteur comportant un vilebrequin équipé d'une came de commande et de moyens de guidage en rotation"

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2135589B2 (de) * 1971-07-16 1973-05-24 Kupplungstechnik Gmbh, 4440 Rheine Drehelastische kupplungshuelse fuer eine zahnkupplung
US5438968A (en) * 1993-10-06 1995-08-08 Bkm, Inc. Two-cycle utility internal combustion engine
DE19707584A1 (de) * 1997-02-26 1998-09-17 Walter Oesterling Kupplungselement für eine flexible Kupplung
JP4952677B2 (ja) * 2008-07-28 2012-06-13 日本精工株式会社 弾性軸継手及び電動式パワーステアリング装置
WO2010035287A1 (en) * 2008-09-29 2010-04-01 Tvs Motor Company Limited System for driving a fuel pump
DE102011107291A1 (de) 2011-07-15 2013-01-17 Deutz Aktiengesellschaft Rollenstößelpumpeinheit
FR2984965A1 (fr) 2011-12-22 2013-06-28 Peugeot Citroen Automobiles Sa Pompe a carburant en bout d'arbre a cames
GB201207235D0 (en) * 2012-04-25 2012-06-06 Delphi Tech Holding Sarl Fuel pump assembly
DE102012216594A1 (de) * 2012-09-18 2014-03-20 Robert Bosch Gmbh Brennkraftmaschine mit einem Kurbelgehäuse
FR3011588A1 (fr) * 2013-10-03 2015-04-10 Renault Sa Moteur diesel comportant une pompe de carburant integree
DE102014201789B4 (de) * 2014-01-31 2022-01-05 Bayerische Motoren Werke Aktiengesellschaft Antriebssystem einer Kraftstoff-Hochdruckpumpe, Kraftstoff- Hochdruckpumpen-Baugruppe sowie Verbrennungsmotor

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
FR3057914B1 (fr) 2018-10-26
FR3057914A1 (fr) 2018-04-27
WO2018073504A1 (fr) 2018-04-26
EP3529485A1 (de) 2019-08-28

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