EP3529485A1 - Cale elastomere entre came pompe hp et volant moteur - Google Patents
Cale elastomere entre came pompe hp et volant moteurInfo
- Publication number
- EP3529485A1 EP3529485A1 EP17777939.4A EP17777939A EP3529485A1 EP 3529485 A1 EP3529485 A1 EP 3529485A1 EP 17777939 A EP17777939 A EP 17777939A EP 3529485 A1 EP3529485 A1 EP 3529485A1
- Authority
- 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.)
- Granted
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
- 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 crankcase.
- the invention also relates to an internal combustion engine of a motor vehicle comprising a crankcase surrounding a crankshaft having a high pressure fuel pump activation cam fixed on one end of the crankshaft.
- the invention relates to an internal combustion engine of a motor vehicle comprising a crankshaft movable in rotation around a longitudinal axis of the engine, the fuel supply of the engine being effected by means of a high-pressure pump which replaces a carburettor, 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 rotating shaft about an axis parallel to the axis of the crankshaft, said shaft is rotated by the crankshaft by means of a transmission device comprising pulleys. substantially coplanar and the end of the crankshaft and the movable shaft and a belt surrounding said pulleys.
- the publication FR301 1588-A1 discloses a cam coaxially fixed to a crankshaft of a motor vehicle engine to drive a high pressure pump for supplying the engine with fuel. Said cam is disposed between two arms of said crankshaft.
- the pump is conventionally a plateau pump which comprises an input shaft rotating a plate which is inclined relative to the axis and which is capable of biasing axial pistons movably mounted in chambers in which is admitted and ejected the fuel.
- a motor comprising a pump comprising a single piston, whose body is fixed to the block and whose piston is driven alternately by a pusher whose end comprises a roller which is capable of being biased by a cam carried by a shaft internal to the engine block, said shaft being parallel to the crankshaft and being driven by said crankshaft via a gear.
- Such a design has the advantage of being more compact than the conventional design, but it nevertheless has the disadvantage of requiring to provide a block that can accommodate an additional shaft, with what this implies in terms of molding complexity and additional machining of the block.
- 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 disadvantage of this type of arrangement is a significant increase in the longitudinal dimension of the engine which is restrictive for vehicles having a motor compartment with reduced dimensions.
- the publication FR301 1588-A1 discloses a high-pressure fuel supply pump for a motor vehicle engine, said pump is actuated by a drive cam attached fixed and coaxial with the shaft of a crankshaft.
- a disadvantage of this type of arrangement is an increase in the overall size of the engine, particularly in the longitudinal direction of the engine, which does not comply with the restrictions on the dimensions of the engine space in the vehicles.
- a particular arrangement of said pump may be orthogonal to the axis of the crankshaft and at a coupling end of said crankshaft facing the coupling face of the engine, said end of the crankshaft is coupled in particular with a flywheel whose The object is to reduce the acyclisms of said engine.
- a drive cam can then be attached to the crankshaft coupling end before a flywheel attachment point and surrounding the crankshaft coupling end.
- said cam is mounted with a sliding fit.
- During operation of the engine it is rotated by the rotation of the crankshaft and undergoes forces due to the acyclisms of the operation of the engine and the relative deformations of the associated parts, forces which can cause axial displacements of the cam and in particular vis-à-vis -vis the flywheel. It is therefore necessary to have means for holding in position relative cam relative to 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 an actuating cam of 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 motor vehicle engine crankshaft surrounding a crankshaft end lined by a flywheel, said crankshaft being housed in a crankcase of the engine, said cam having 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 bears a connecting ring for maintaining in axial position said cam with the crankshaft.
- the connecting ring makes it possible to damp the shocks due to the acyclisms of the operation of the motor and makes it possible to keep 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 mounted slippery to allow easy disassembly of the crankshaft for example during handling in a maintenance workshop. Due to this sliding assembly, during the operation of the engine, it is subjected to repeated shocks which can cause a sliding of the cam on the end of the crankshaft, sliding which can therefore cause poor contact in support of a pump to powered fuel by said cam and thus a poor supply of fuel. It is therefore necessary to maintain this cam in axial position with the crankshaft.
- the connecting ring is elastic.
- the elastic connecting ring makes it possible to maintain the actuating cam in axial position and to damp the shocks due to the acyclisms of the operation of the heat engine causing axial displacements of the cam.
- the ring thanks to its flexibility characteristics damping effects of the engine.
- the connecting ring is fixed to a radial end wall of the actuating cam.
- the connecting ring is arranged at the end of the crankshaft facing the coupling face of the heat engine, which contributes to reducing the size of the arrangement of the high-pressure fuel pump and therefore the engine.
- the connecting ring is made of elastomer.
- the connecting ring is made of elastomer which has an ease of manufacture with a reduced cost.
- the connecting ring has a radial face vis-à-vis with the flywheel.
- the connecting ring arranged around the cylindrical bearing portion of the actuating cam has a radial face vis-à-vis with the flywheel. It thus separates the actuating cam from the flywheel and preserve a space between the actuating cam and the flywheel.
- FIG 1 is a longitudinal sectional view of a crankcase of a heat engine with a particular arrangement of a high-pressure fuel supply pump.
- FIG. 2 is a longitudinal sectional view of the coupling end of the crankshaft with an actuating cam of a high-pressure fuel supply pump.
- FIG. 3 is a view of the coupling end of the crankshaft with an actuating cam of a high-pressure fuel supply pump and of the connecting ring according to the invention.
- FIG. 4 is a view of the coupling end of the crankshaft with an actuating cam of a high-pressure fuel supply pump without the connecting ring according to the invention;
- FIG. 5 is a longitudinal sectional view of the coupling end of the crankshaft with an actuating cam of a high-pressure fuel supply pump and of the connecting ring.
- FIG. 6 is a longitudinal sectional view of the coupling end of the cylinder block with an actuating cam of a high-pressure fuel supply pump and of the connecting ring.
- FIG. 7 is a schematic view of the actuating cam.
- FIG 8 is a schematic view of the actuating cam with the connecting ring. Detailed description of the figures
- the following description is made along three spatial axes which are the longitudinal direction X of the engine, the transverse direction Y coplanar and orthogonal with said longitudinal direction X to define a horizontal plane of the vehicle, and a vertical direction Z directed towards the top of the vehicle.
- the longitudinal direction X is with respect to the heat engine which is perpendicular to the longitudinal direction of the vehicle for a transversely mounted motor.
- the heat engine comprises a fuel supply pump 14 arranged at a coupling end 1 10 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 1 1.
- the automotive engine heat 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 motion along the axis of said cylinder, and a cylinder head (not shown) covering the upper part of the crankcase facing the hood of the vehicle.
- the movements of the piston are caused by a variation of a combustion chamber defined by the at least one cylinder 13, said piston and a wall of the cylinder head.
- the at least one piston is connected to a crankshaft 10 arranged along a substantially horizontal axis X and orthogonal to the vertical axis Y of the at least one cylinder and the sliding movements back and forth of the at least one piston leads to
- the sliding displacements 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 supply pump 14 for injecting fuel into the combustion chamber via injectors through may be a high pressure pump comprising an axle holding at one free end a drive roller bearing on a driving surface. Said surface has corrugations and is driven in motion by the rotation of the crankshaft.
- said driving surface is, for example, a peripheral surface 24 of a plate 23 of substantially oblong shape of the actuating cam 15, which is secured in rotation about its axis at its end. crankshaft axis 10.
- a particular arrangement of said high-pressure pump according to the invention is an arrangement of the high-pressure fuel supply pump 14 orthogonal to the horizontal axis X of the crankshaft and to the coupling end 11 of said crankshaft. 10 facing the coupling face 1 10 of the engine, said end of the crankshaft is coupled in particular with the flywheel 1 1 of the engine whose object is to reduce the acyclisms of said engine.
- the crankshaft comprises an axle with a first end 14 of accessories linked to a toothed wheel (not shown) capable of driving a camshaft gear and accessory gears such as a water pump or an air conditioning compressor. (Not shown) and a second end 1 1 1 of diametrically opposite coupling connected to the gearbox and on which is fixed the flywheel 1 1.
- the actuating cam is fixed on the coupling end of the crankshaft before a fastening point 1 12 of the flywheel 1 January.
- Said actuating cam 15 is rotated by the rotation of the crankshaft January 1 and is particularly subjected to forces due to the acyclisms of the operation of the engine and the relative deformations of the associated parts, forces which can cause radial and axial displacements of the cam and particularly relative to the flywheel.
- the actuating cam 15 comprises a bearing portion 16 in a preferential manner cylindrical adapted to surround the coupling end 1 January 1 of the crankshaft January 1, said bearing portion 16 is extended radially by a substantially oblong plate 23 which has the peripheral surface 24 on which bears a roller of the pump 14 high fuel supply pressure. Said cylindrical bearing portion 16 is distinct 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 opposite the flywheel 1 1.
- This form of actuating cam 15 allows an optimal geometrical adaptation of the cam according to geometrical constraints of the crankcase 12. As shown in FIGS. 4 to 6, the cylindrical bearing portion 16 allows the connection of the cam of FIG.
- actuation with the crankshaft 10 and 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 1 1 and the actuating cam 15. According to FIG.
- the actuating cam 15 and the connecting ring 30 are housed in a chamber 30 of the cylinder block 12 preferably at a longitudinal end 1 10 of said crankcase-side coupling side.
- said reception chamber 30 is separated from a chamber of rods 31 in which are arranged the crankshaft elements that are the crank pins 32 and the journals 33, by an end wall 34 of the crankcase 12, wall that surrounds a crankshaft bearing bearing.
- the coupling end 1 1 1 of the crankshaft thus opens out of the connecting rod chamber 31 by passing through a holding opening cut in the end wall 34 and surrounding the holding bearing of said crankshaft, in the reception chamber 30.
- Said reception chamber is for example delimited by 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 comprise an orifice (not shown) for the passage of the substantially cylindrical body of the high pressure pump.
- the actuating cam 15 can have axial displacements and come into contact with the flywheel 1 1.
- the connecting ring makes it possible to push said cam 15 to separate it from the flywheel, thus maintaining the actuating cam axially.
- the cam may also have radial relative displacements.
- the connecting ring 40 also allows a radial holding of the actuating cam. Due to its elastic characteristics, the connecting ring ensures an optimal hold in place of the drive cam. It also provides damping shocks due to the acyclisms of engine operation.
- the actuating cam 15 is mounted around the coupling end 11 January 1 of the crankshaft 10 with a sliding fit with a minimum or ordinary clearance to allow easy disassembly of said cam during maintenance phases. or cleaning the engine requiring disassembly of the crankshaft.
- the connecting ring allows axial retention in position of the actuating cam.
- Said connecting ring makes it possible, with a minimum cost, to keep the actuating cam mounted around the coupling end of the crankshaft in a position with a sliding fit to facilitate the mechanical dismounting operations, and the damping of the shocks undergone by said cam and to seal the housing chamber of the crankcase.
- 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 is housed the connecting ring.
Landscapes
- 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)
Abstract
Description
Claims
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 true EP3529485A1 (fr) | 2019-08-28 |
EP3529485B1 EP3529485B1 (fr) | 2020-08-05 |
Family
ID=57583326
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17777939.4A Active EP3529485B1 (fr) | 2016-10-20 | 2017-09-14 | Cale elastomere entre came pompe hp et volant moteur |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3529485B1 (fr) |
FR (1) | FR3057914B1 (fr) |
WO (1) | WO2018073504A1 (fr) |
Families Citing this family (1)
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)
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 |
AP3411A (en) * | 2008-09-29 | 2015-09-30 | Tvs Motor Co Ltd | 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 |
-
2016
- 2016-10-20 FR FR1660184A patent/FR3057914B1/fr not_active Expired - Fee Related
-
2017
- 2017-09-14 WO PCT/FR2017/052450 patent/WO2018073504A1/fr unknown
- 2017-09-14 EP EP17777939.4A patent/EP3529485B1/fr active Active
Also Published As
Publication number | Publication date |
---|---|
WO2018073504A1 (fr) | 2018-04-26 |
FR3057914A1 (fr) | 2018-04-27 |
FR3057914B1 (fr) | 2018-10-26 |
EP3529485B1 (fr) | 2020-08-05 |
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