WO2015140420A1 - Distribution system for a motor vehicle internal combustion engine - Google Patents
Distribution system for a motor vehicle internal combustion engine Download PDFInfo
- Publication number
- WO2015140420A1 WO2015140420A1 PCT/FR2014/053110 FR2014053110W WO2015140420A1 WO 2015140420 A1 WO2015140420 A1 WO 2015140420A1 FR 2014053110 W FR2014053110 W FR 2014053110W WO 2015140420 A1 WO2015140420 A1 WO 2015140420A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- rotation
- axis
- crankshaft
- drive device
- distribution
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B67/00—Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for
- F02B67/04—Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for of mechanically-driven auxiliary apparatus
- F02B67/06—Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for of mechanically-driven auxiliary apparatus driven by means of chains, belts, or like endless members
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
- F16H55/02—Toothed members; Worms
- F16H55/30—Chain-wheels
Definitions
- the present invention relates to a distribution system of an internal combustion engine of a motor vehicle.
- the internal combustion engine comprises a crankshaft allowing the conversion, by means of the pistons, of the energy produced by the combustion of the fuel in the combustion chambers in a continuous rotational movement.
- a distribution system generally comprises a pinion and a timing chain.
- the pinion is rotated by the crankshaft and drives the timing chain.
- the timing chain in turn rotates a camshaft on which the valves are secured.
- the pinion is placed in compression between the crankshaft and an accessory pulley by a screw sized to allow good transmission of torque from the crankshaft to the pinion and the accessory pulley.
- a sprocket 1 of a timing chain comprising two cylinders 2, also called “heels”, comparable to the stretching of the periphery of the internal diameter perpendicular to the plane of a toothed disk 4, on either side of the pinion 1.
- One of these heels 2 is inserted during the assembly of the motor in a reduced diameter end 6 of the crankshaft 8, without the insertion is made in force.
- the pinion 1 is maintained substantially in the axis of rotation of the crankshaft 8.
- the accessory pulley 14 is then inserted through the casing. 12 of the chain, and the other bead 2 of the pinion 1 fits into the accessory pulley 14. This keeps the axis of rotation of the accessory pulley 14 substantially aligned with the axes of rotation of the pinion 1 and the crankshaft 8.
- a problem that arises and that aims to solve the present invention is to obtain a simpler distribution system.
- a distribution system for an internal combustion engine of a motor vehicle comprising a crankshaft which defines an axis of rotation and shaped to be rotated about its axis of rotation by engine pistons, and a distribution drive device which defines an axis of rotation and is shaped to be rotated about its axis of rotation by the crankshaft, this distribution drive device being shaped to cooperate, via a distribution chain stretched between the dispensing drive device and a distribution shaft, with the distribution shaft, for the actuation of the valves d engine exhaust gas inlet and outlet, said delivery system comprising holding means shaped to maintain the axis of rotation of the distribution drive device substantially aligned with the axis of rotation of the crankshaft during the tensioning of the distribution chain, the holding means comprising at least one part integrated in the distribution drive device, and this integrated part is shaped to be obtained by stamping.
- the part integrated in the distribution drive device of the holding means can be, for example, in one piece with the dispensing drive device or even defined in the dispensing drive device. It may for example be a through opening, a cavity or a protruding part.
- the part integrated in the dispensing drive device can be effectively obtained by stamping.
- the dispensing drive device, and thus the dispensing system, can thus be relatively simpler to manufacture.
- the part integrated in the distribution drive device of the holding means can be obtained by embossing, embossing or any other suitable technique.
- the dispensing drive device may comprise a pinion.
- the pinion as a whole can be obtained by stamping.
- Such a pinion can thus be relatively simple to manufacture.
- the sprockets obtained by stamping can be relatively easily produced in large quantities.
- the pinion can be made of sheet metal or any other suitable material. When the pinion is made of sheet metal, the prior rolling of the sheet makes it possible to obtain the two faces of the pinion substantially parallel, without additional operation, which makes it possible to substantially simplify the checks of parallelism of the faces of such a pinion intended to be rotated on its axis of rotation.
- the stamping of the pinion can make it possible to obtain the drive teeth of the distribution chain without resorting to additional operations such as machining.
- a pinion obtained by stamping may have lightening holes obtained from the stamping operation.
- Such pinion may comprise a toothed drive disk, and a circular central opening delimited by an axial bearing face perpendicular to the faces of the sheet around the opening.
- the circular central opening may have a diameter of, for example, between 25 mm and 50 mm, and may extend over a thickness of, for example, between 4.5 mm and 9 mm.
- the pinion may be planar but may alternatively be of tulip shape.
- a pinion of tulip shape generally has an axial bearing face which is not in the same plane as the disk formed by the drive teeth. Such a conformation may be particularly advantageous when there is, for example, a mounting stress requiring that the distribution chain is slightly offset from the axial bearing face of the pinion.
- the distribution drive device may comprise a pulley, for example poly-V or multi-V, and the distribution chain may then be substituted by a timing belt.
- the part integrated in the distribution drive device of the holding means may comprise at least one opening therethrough. It is relatively simple to obtain a through opening by stamping, so the dispensing system is made even simpler.
- the holding means may further comprise at least one retaining element shaped to fit into said at least one through opening.
- the through opening may be, for example, a circular opening, of a diameter that may be, without limitation, 1 mm to 1 cm.
- the through opening may have any suitable shape, curved or polygonal, for example of square, rectangular or triangular shape.
- the through opening may pass through the dispensing drive in a direction substantially parallel to the axis of rotation of the dispensing drive.
- the portion integrated in the distribution drive device of the holding means may for example comprise 3 through openings, and the holding means may for example comprise 3 retaining elements.
- the three through openings may be advantageously distributed substantially uniformly about the axis of rotation of the dispensing drive device.
- the through openings may be spaced at an angle of 2 ⁇ / 3 radians on a circle centered on the axis of rotation of the dispensing drive device, the circle being in a plane perpendicular to the axis of rotation.
- the three through openings may be made at a distance from the axis of rotation of the dispensing drive device adapted for the retaining elements therethrough to come into contact around or in the crankshaft thickness. It is thus possible to obtain a relatively isostatic maintenance of the dispensing drive device with the crankshaft.
- the part integrated in the distribution drive device of the holding means may also comprise more than 3 through openings and the holding means may also comprise more than 3 retaining elements, for example between 4 and 10 through openings and between 4 and 10 retaining elements.
- the more than 3 through apertures may be distributed substantially evenly around the axis of rotation of the dispensing drive device.
- the 3 retaining elements can be pins.
- the pins may be elastic pins.
- the elastic pins have the advantage of being inexpensive and being insertable into holes of diameter smaller than their own diameter, often by simple manual compression.
- the elastic pins may be cylindrical or have an open crescent-shaped section.
- the pins can be made of metal or polymeric materials.
- the pins can be made of a full or hollow cylinder.
- the pins may have any shape adapted to fit into the through openings.
- the integral portion of the delivery driver of the holding means may include one or more integral tabs with the dispensing driver.
- the dispensing driver may have 3 tabs, but also between 4 to 10 foldable tabs.
- the tongues may be of a thickness substantially corresponding to the thickness of the dispensing drive device.
- the tongues may be of a length less than or equal to the radius of the central opening of the dispensing drive device.
- the portion integrated in the distribution drive device of the holding means may comprise one or more beads. These beads may define a protruding portion on one side of the dispensing drive device, in a direction substantially parallel to the axis of rotation of the dispensing drive device, over all or part of a revolution of a centered circle. on the axis of rotation of the dispensing drive device.
- the invention is therefore in no way limited to a particular form of the part integrated in the distribution drive device of the holding means.
- the holding means can maintain the axis of rotation of the distribution drive device substantially aligned with the axis of rotation of said crankshaft bearing on an outer surface of the crankshaft.
- the holding means may be shaped so that the portion integrated in the distribution drive device of the holding means is disposed at a sufficient distance from the axis of rotation of the dispensing drive device so that the holding means bear on an external surface of the crankshaft. This makes it possible not to encumber the internal diameter of the dispensing drive device. This advantageously makes it possible to be relatively simply adaptable for any type of crankshaft.
- the holding means can maintain the axis of rotation of the distribution drive device substantially aligned with the axis of rotation of the crankshaft by insertion into a thickness of the edge of the crankshaft.
- the holding means may be shaped so that the portion integrated in the distribution drive device of the holding means is disposed at a sufficient distance from the axis of rotation of the dispensing drive device so that all or part of the holding means fits into a thickness of the crankshaft edge.
- the edge of the crankshaft can be understood the crankshaft face facing the dispensing drive. It is thus possible to prevent the retaining element from moving during the rotation of the distribution drive device induced by the operation of the motor.
- the dispensing system may comprise an accessory pulley which defines an axis of rotation, shaped to be rotated about its axis of rotation by the dispensing drive device.
- one end of the pulley may be shaped to pass through the dispensing drive device and to fit into one end of the crankshaft so as to maintain the rotation axis of the substantially aligned dispensing drive device. with the axis of rotation of the crankshaft during the operation of the engine. Maintaining the axial alignment between the distribution drive device and the crankshaft is provided temporarily by the holding means, in particular during the tensioning of the timing chain, and more generally as long as the pulley of accessory is not installed. The accessory pulley then maintains the axial alignment between the dispensing drive and the crankshaft permanently.
- the accessory pulley may be shaped so that the holding means fit into a thickness of the edge of the accessory pulley abutting against the dispensing drive device, which may allow to relatively immobilize the holding means during operation of the engine.
- the dispensing system may comprise a screw adapted to allow compression of the drive device of the distribution between the accessory pulley and the crankshaft so that the torque of the crankshaft is transmitted, relatively without sliding, to the device. dispensing drive and accessory pulley.
- the invention also relates to an internal combustion engine comprising a distribution system as described above.
- the invention also relates to a motor vehicle comprising a combustion engine as described above.
- the invention also relates to a method of mounting a distribution system of an internal combustion engine, the distribution system comprising a crankshaft which defines an axis of rotation and shaped to be rotated about its axis of rotation. rotation by engine pistons, and a dispensing drive device which defines an axis of rotation and shaped to be rotated about its axis of rotation by the crankshaft, the dispensing drive being shaped to cooperate, via a timing chain tensioned between the timing drive and a timing shaft, with the timing shaft, for actuating the intake and exhaust gas valves of the engine, the method comprising: a step of installing holding means so as to maintain the axis of rotation of the dispensing drive device substantially aligned with the axis of rotation of the crankshaft during the tensioning of the distribution chain, the holding means comprising at least one part integrated in the dispensing drive device, and the part integrated in the dispensing drive device.
- holding means is shaped to be obtained by stamping, and a step of installation and tensioning of the
- the mounting method may comprise a step of installing an accessory pulley which defines an axis of rotation, so that said pulley is rotated about its axis of rotation by said dispensing drive, and an end of this pulley being shaped to pass through the dispensing drive and to fit into one end of the crankshaft so as to maintain the dispensing drive in the axis of the crankshaft during operation of the engine .
- FIG. 1 is a schematic view of a distribution system according to an embodiment known in the prior art
- FIG. 2 is a view of a distribution drive pinion according to an embodiment known in the prior art
- FIG. 3 is a view of an example of a pinion obtained by stamping and resilient pins according to one embodiment of the invention
- FIG. 4 is a schematic view of an exemplary distribution system according to a first embodiment of the invention
- FIG. 5 is a schematic view of an exemplary distribution system according to a second embodiment of the invention
- a distribution system 40 comprises a crankshaft 8 defining an axis of rotation 42.
- the crankshaft 8 is rotated by the pistons, not shown, of the internal combustion engine, not shown, this drive rotating the crankshaft about the axis of rotation 42.
- a distribution drive device 1, comprising here a distribution drive pinion 1, also called simply pinion 1, is abutted against an edge 45 of the crankshaft 8.
- the pinion 1 with reference to FIG. 3, obtained by stamping, defines an axis of rotation 32 around which the pinion 1 is intended to rotate.
- the pinion 1 comprises a disk 4, with a thickness of approximately 4.5 mm, and a multitude of teeth 5 defined on the outer periphery of the disk 4.
- the disk 4 has two substantially planar faces 35, 37 extending in a plane perpendicular to the axis of rotation 32.
- the disc 4 comprises a central opening 39 defining an axial bearing face 34, with a diameter of about 25mm.
- This axial bearing surface 34 constitutes the face on which the pinion 1 rests to rotate about its axis of rotation 32.
- the disk 4 has a multitude of lightening holes 36 which pass through the disk 4 from one side to the other.
- These lightening holes 36 are distributed in a relatively regular manner, at a distance from the center of the disk 4 substantially equal to each other, for example at a radial distance which may be between 30 mm and 50 mm from the center of the disk 4.
- the positioning of the lightening holes 36 on the disk 4 of the pinion 1 is a thing well known to those skilled in the art.
- the pinion 1 comprises holding means 38, 30 to maintain the axis of rotation 32 of the pinion 1 substantially aligned with the axis of rotation 42 of the crankshaft 8.
- These holding means 38, 30 are here composed of 3 through openings 38 defined in the disk 4, and 3 retaining elements 30, here 3 elastic pins 30, of crescent-shaped section, each being inserted into one of the through openings 38.
- Each of the through openings 38 passes right through the disk 4, in a direction substantially parallel to the axis of rotation 32 of the pinion 1.
- the through openings 38 are spaced apart from each other at an angle of 2 ⁇ / 3 radians around the axis of rotation 32 of the pinion 8.
- the through openings 38 are made on the disk 4 at a radial distance shaped to allow the pins 30 inserted in the through openings 38 to bear on the crankshaft 8.
- this radial distance is carried out, in this embodiment, as a function of the diameter of the section of the crankshaft 8 and as a function of the size of the disc 4 of the pinion 1.
- These through openings 38 may for example be made at a radial distance from the center of the disc 4 between 26 mm and 50 mm.
- the through openings 38 are made at a distance from the axis of rotation 32 adapted so that each pin 30 inserted into a through opening 38 bears on an outer surface 44 of the crankshaft 8.
- the axis of rotation 32 of the pinion 1 is maintained substantially aligned with the axis of rotation 42 of the crankshaft 8, by a relatively isostatic maintenance.
- a small mechanical clearance between the pins 30 and the outer surface 44 of the crankshaft 8, with a value ranging from 1 mm to 10 mm, can be deliberately obtained so as to slightly vary the alignment of the axis of rotation 32 pinion 1 with the axis of rotation 42 of the crankshaft 8.
- This mechanical play can also be the result of the elasticity of the elastic pins 30.
- This chain 10 is shaped to be driven by the pinion 1.
- the chain 10 is tensioned to allow proper operation of the dispensing system 40.
- the sizing and selection of a distribution chain 10 adapted to the pinion 1 is a thing well known to those skilled in the art.
- a chain case 12 is then installed to isolate the crankshaft assembly 8, pinion 1 and chain 10 from the rest of the engine.
- This chain housing 12 has an opening 46 shaped to allow the passage of an end 48 of an accessory pulley 14 so that this end 48 passes through the central opening 39 of the pinion 1 and fits into a end 49 of the crankshaft 8, here a cavity 49 dug in the edge 45 of the crankshaft 8 facing the pinion 1.
- the end 48 of the accessory pulley 14 is shaped to define a diameter substantially equal to the diameter of the internal opening 39 of the pinion 1 and the diameter of the cavity 49 of the crankshaft 8, which makes it possible to maintain, during the operation of the motor, and permanently, the axis of rotation 42 of the crankshaft 8 substantially aligned with the axis of rotation 32 of the pinion 1.
- the distribution system 40 is shaped so that the internal opening 39 of the pinion 1 and the cavity 49 of the crankshaft 8 have a diameter substantially equal to the diameter of the end 48 of the accessory pulley 14.
- a mechanical clearance between these elements which can correspond to a difference in diameter of 1 mm to 10 mm, can be voluntarily obtained so as to allow a relatively simple assembly and disassembly of the distribution system 40.
- a transmission edge of the torque 47 of the accessory pulley 14 abuts against the pinion 1.
- a screw 16 is then installed to compress the crankshaft 8 with the pinion 1 and the accessory pulley 14.
- This screw 16 allows a relatively good transmission of the torque of the crankshaft 8 to the pinion 1, by contact between the face 35 of the pinion 1 vis-à-vis and in abutment with the edge 45 of the crankshaft 8.
- This screw 16 allows the transmission of torque between the face 37 of the pinion 1 vis-à-vis and in abutment with the transmission edge of the torque 47 of the accessory pulley 16.
- crankshaft 8 in abutment with the pinion 1 comprises 3 circular openings 52, adapted so that the pins 30 can be inserted. These circular openings 52 are distributed over the edge 45 of the crankshaft 8, so that each pin 30 inserted into a through opening 38 can be inserted into a circular opening 52.
- the pins 30 maintain the axis of rotation 42 of the crankshaft 8 substantially aligned with the axis of rotation 32 of the pinion 1 while having one of their end inserted into the crankshaft 8, which advantageously allows the pins 30 to be held relatively fast. immobile while operating the engine.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
- Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BR112016021386-6A BR112016021386B1 (en) | 2014-03-20 | 2014-12-02 | DISTRIBUTION SYSTEM, INTERNAL COMBUSTION ENGINE, AUTOMOTIVE VEHICLE, AND ASSEMBLY PROCESS OF AN INTERNAL COMBUSTION ENGINE DISTRIBUTION SYSTEM |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1452328 | 2014-03-20 | ||
FR1452328A FR3018885B1 (en) | 2014-03-20 | 2014-03-20 | DISTRIBUTION SYSTEM FOR AN INTERNAL COMBUSTION ENGINE OF A MOTOR VEHICLE |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2015140420A1 true WO2015140420A1 (en) | 2015-09-24 |
Family
ID=51014448
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2014/053110 WO2015140420A1 (en) | 2014-03-20 | 2014-12-02 | Distribution system for a motor vehicle internal combustion engine |
Country Status (3)
Country | Link |
---|---|
BR (1) | BR112016021386B1 (en) |
FR (1) | FR3018885B1 (en) |
WO (1) | WO2015140420A1 (en) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2931094A (en) * | 1957-07-29 | 1960-04-05 | Teerlink James | Method of making sprocket |
DE19535240A1 (en) * | 1995-09-22 | 1997-03-27 | Daimler Benz Ag | Automotive timing chain sprocket |
FR2905996A1 (en) * | 2006-09-19 | 2008-03-21 | Renault Sas | Transmission element e.g. timing gear and accessory pulley, assembling device for crankshaft nose of internal combustion engine, has coupling unit, and sealing unit closing space that extends between nose and element, in sealed manner |
US20080245321A1 (en) * | 2007-03-30 | 2008-10-09 | Honda Motor Co., Ltd | Vertical type engine |
FR2921693A3 (en) * | 2007-10-02 | 2009-04-03 | Renault Sas | Accessory pulley mounting device for crankshaft in internal combustion engine, has metallic spring including toric shaped metallic plate, connecting accessory pulley to pulley support, and dampening vibrations transmitted towards crankshaft |
-
2014
- 2014-03-20 FR FR1452328A patent/FR3018885B1/en active Active
- 2014-12-02 WO PCT/FR2014/053110 patent/WO2015140420A1/en active Application Filing
- 2014-12-02 BR BR112016021386-6A patent/BR112016021386B1/en active IP Right Grant
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2931094A (en) * | 1957-07-29 | 1960-04-05 | Teerlink James | Method of making sprocket |
DE19535240A1 (en) * | 1995-09-22 | 1997-03-27 | Daimler Benz Ag | Automotive timing chain sprocket |
FR2905996A1 (en) * | 2006-09-19 | 2008-03-21 | Renault Sas | Transmission element e.g. timing gear and accessory pulley, assembling device for crankshaft nose of internal combustion engine, has coupling unit, and sealing unit closing space that extends between nose and element, in sealed manner |
US20080245321A1 (en) * | 2007-03-30 | 2008-10-09 | Honda Motor Co., Ltd | Vertical type engine |
FR2921693A3 (en) * | 2007-10-02 | 2009-04-03 | Renault Sas | Accessory pulley mounting device for crankshaft in internal combustion engine, has metallic spring including toric shaped metallic plate, connecting accessory pulley to pulley support, and dampening vibrations transmitted towards crankshaft |
Also Published As
Publication number | Publication date |
---|---|
BR112016021386A2 (en) | 2017-10-03 |
BR112016021386B1 (en) | 2023-04-11 |
FR3018885A1 (en) | 2015-09-25 |
FR3018885B1 (en) | 2017-02-10 |
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