EP2021600A1 - Bielle pour attelage mobile d'un groupe motopropulseur et attelage mobile comportant une telle bielle - Google Patents
Bielle pour attelage mobile d'un groupe motopropulseur et attelage mobile comportant une telle bielleInfo
- Publication number
- EP2021600A1 EP2021600A1 EP07765997A EP07765997A EP2021600A1 EP 2021600 A1 EP2021600 A1 EP 2021600A1 EP 07765997 A EP07765997 A EP 07765997A EP 07765997 A EP07765997 A EP 07765997A EP 2021600 A1 EP2021600 A1 EP 2021600A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- connecting rod
- rod according
- core
- track rod
- rod
- 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- Withdrawn
Links
- 230000008878 coupling Effects 0.000 claims description 11
- 238000010168 coupling process Methods 0.000 claims description 11
- 238000005859 coupling reaction Methods 0.000 claims description 11
- 238000002485 combustion reaction Methods 0.000 claims description 10
- 239000012530 fluid Substances 0.000 claims description 5
- 230000033001 locomotion Effects 0.000 claims description 5
- 230000035939 shock Effects 0.000 claims description 5
- 238000013016 damping Methods 0.000 claims description 4
- 239000006096 absorbing agent Substances 0.000 claims 1
- 238000004880 explosion Methods 0.000 description 7
- 206010052904 Musculoskeletal stiffness Diseases 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 230000000750 progressive effect Effects 0.000 description 3
- 239000003292 glue Substances 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000004952 Polyamide Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000000763 evoking effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 244000045947 parasite Species 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Classifications
-
- 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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C7/00—Connecting-rods or like links pivoted at both ends; Construction of connecting-rod heads
- F16C7/02—Constructions of connecting-rods with constant length
- F16C7/023—Constructions of connecting-rods with constant length for piston engines, pumps or the like
-
- 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
- F02B75/00—Other engines
- F02B75/04—Engines with variable distances between pistons at top dead-centre positions and cylinder heads
- F02B75/045—Engines with variable distances between pistons at top dead-centre positions and cylinder heads by means of a variable connecting rod length
-
- 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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C7/00—Connecting-rods or like links pivoted at both ends; Construction of connecting-rod heads
- F16C7/04—Connecting-rods or like links pivoted at both ends; Construction of connecting-rod heads with elastic intermediate part of fluid cushion
Definitions
- Connecting rod for a mobile coupling of a powertrain and mobile coupling comprising such a connecting rod.
- the invention relates to powertrains, including those fitted to motor vehicles. More specifically, the invention relates to the movable coupling constituted by all the pistons, connecting rods and crankshafts set in motion during operation of an internal combustion engine.
- combustion noise has as its main source the violent explosions of the gases contained in the cylinders. These explosions generate impulsive forces, transmitted to the various casings of the motor base via the mobile coupling, and are particularly noticeable on the engines with self - controlled ignition, hence the "coloration" very specific to the noise of a vehicle said Diesel.
- the invention therefore relates to a means for limiting the transmission, by the movable coupling, of the pulses generated by the combustion explosions.
- this object is achieved according to the invention by the use of a rod articulated on the axis of a piston and on the axis of a crankpin, this connecting rod having an inner chamber in which is disposed a core that can move relative to the body of the connecting rod, the core having a housing for one of the connecting axes.
- the inner chamber is also provided with axial stops which limit the movements of the core along the axis of the body of the connecting rod and above all are capable of damping at least part of the energy released by the impacts caused by the engine explosions. while maintaining the transmission function of the connecting rod.
- the mobile coupling can participate in the control of engine vibration, and thus the reduction of "slam".
- the invention is particularly applicable to diesel engines but can in fact be applied to any type of engine equipped with a movable coupling comprising a connecting rod.
- Figure 1 a skinned showing the main components of a mobile equipment associated with an internal combustion engine
- Figure 2 a sectional view of a connecting rod according to the principle of the invention.
- Figure 3 a sectional view of a connecting rod according to a first embodiment of the invention
- Figure 4 a sectional view of a connecting rod according to a second embodiment of the invention
- Figure 5 a sectional view of a connecting rod according to a third embodiment of the invention.
- a conventional moving assembly allows the transmission of the reciprocating rectilinear motion of the piston to the motor shaft.
- This crew consists mainly of a rod 1.
- the small end 2 is articulated on the axis 3 of a piston 4.
- a connecting rod 5 is interposed between the axis 3 and the small end 2.
- the central portion of the connecting rod typically thinned relative to the small end 2 and especially to the connecting rod head 6, is the connecting rod body, substantially oblong and admitting a longitudinal axis of symmetry also called connecting rod.
- the connecting rod head 6 is articulated around a crank pin 7 of the crankshaft 8.
- a crankshaft bearing 9 is interposed between the connecting rod head 6 and the crank pin 7.
- the head is in fact made of two parts, including a reported portion 13, said head cap, attached to the rest of the connecting rod by head screws.
- the connecting rod is well articulated on two axes of connection, in this case, the axis of the piston and the axis of the crankpin.
- the connecting rod or more precisely all the mobile coupling, is designed as a mechanically rigid assembly, this to meet its primary function of transmitting the forces of the piston to the motor shaft, and this throughout the cycle of engine life. Under these conditions, it is clear that this set will also transmit all the vibrations considered as parasites like those generated by the explosions at each combustion cycle.
- FIG. 2 schematically illustrates the principle of a connecting rod according to the invention.
- This connecting rod is essentially constituted by an oblong body admitting a longitudinal axis of symmetry 21.
- the connecting rod head 22 is provided with a housing 23 for the axis of a piston and is therefore very similar to the conventional rod head illustrated in FIG. 1.
- the rod according to the invention comprises an inner chamber 24.
- This chamber 24 is lined on the one hand by a core 25 - provided with a housing 26 for articulation on a crankpin, and secondly abutments 27 which limit the movement of the core
- guide means in translation of the core are provided, consisting of grooves dug in the body of the rod in which are slid members of the core forming behind the scenes 28.
- Figure 3 illustrates another means for ensuring the guiding in translation, consisting in providing studs 29 integral with the body of the connecting rod and associated with drums 30 formed in the core.
- the maximum displacement amplitude of the core in the inner chamber of the connecting rod can be adjusted by adjusting the length of the drums, the studs coming to a stop in the bottom of the drums when the core has reached its maximum amplitude of translation.
- the ends of the studs penetrating the barrels have the shape of a pointed cone, thus making it possible to create a stiffness of progressive contacting when the bolt comes into contact with the bottom of the barrel, thus contributing to a function of shock absorption.
- the environment of the connecting rod must of course be taken into account for the realization of stops and the core.
- these elements must be even to withstand the temperatures at which the rods are subjected, which assumes materials capable of withstanding a temperature of the order of 150 0 C, which in practice excludes elastomeric type materials without excluding all plastics.
- the stresses on a connecting rod are considerable, the pressure in the rolls being able to reach, for example, values of the order of 180 bars.
- a material such as aluminum may be suitable, especially for producing the core.
- rigid plastics having a Young's modulus of about 10 GPa which advantageously have a higher elastic limit than aluminum. It is still possible, according to another embodiment of the invention, to make abutments made of aluminum-based composites or metal braids.
- the stops may also be constituted by an assembly of springs, Belleville washers, hydroelastic wedges according to the principle of those used for example for the suspension of an engine to a motor vehicle body.
- the stops are constituted by a series of fins s' straddling into each other, one 31 associated with the core and the other 32 to the body of the rod, as for a splice assembly.
- the faces of the fins are interconnected by a material of the "glue” type 33 which will shear when the core moves in translation relative to the connecting rod body, thus allowing the shock absorption and vibrations due to engine explosions.
- the "glue” is for example constituted by a material with elastic behavior, or preferably viscoelastic, such as an elastomer, a polymer or a polyamide, whose properties will be adapted to the engine temperature.
- This embodiment also makes it possible to introduce a strong overall stiffness between the core and the connecting rod body when the mobile frame is at the end of the stroke and the viscoelastic layers have a shear. maximum. Indeed, when this case occurs, the ends of the fins associated with the core come into contact with the connecting rod body (and conversely, the fins of the connecting rod body abut on the core) and it is therefore the rigidity of the fins which characterizes the overall stiffness of the connecting rod. To make this stiffness more progressive depending on the position in abutment of the core fins may have slightly different lengths which allows better shock absorption.
- the stops consist essentially of plates 34, integral with the core and moving inside the chamber 35, to abut on buffer elements 36.
- the chamber is also filled with a viscous fluid which circulates around the plate 33 and through holes 36.
- the buffer elements 36 allow to maintain a significant but progressive stiffness between the core and the body of the connecting rod, stiffness necessary for the transmission of the piston force .
- the viscous fluid used is for example oil or other viscous fluid compatible with this environment. It can be emphasized that the size and the number of bores 36 make it possible to optimize the viscous damping capacity of the abutments, as well as the viscosity of the fluid.
- the core is disposed around the housing provided for the crankpin.
- the invention is not limited to this embodiment and it is also possible to have the damping means according to the invention arranged around the housing provided for the axis of a piston. Finally, it is also possible to have these means at the top and bottom of the connecting rod, even if, obviously, the realization is then more complex.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (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 |
|---|---|---|---|
| FR0651929A FR2901585B1 (fr) | 2006-05-29 | 2006-05-29 | Bielle pour attelage mobile d'un groupe motopropulseur et attelage mobile comportant une telle bielle |
| PCT/FR2007/051216 WO2007138205A1 (fr) | 2006-05-29 | 2007-05-04 | Bielle pour attelage mobile d'un groupe motopropulseur et attelage mobile comportant une telle bielle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP2021600A1 true EP2021600A1 (fr) | 2009-02-11 |
Family
ID=37684838
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP07765997A Withdrawn EP2021600A1 (fr) | 2006-05-29 | 2007-05-04 | Bielle pour attelage mobile d'un groupe motopropulseur et attelage mobile comportant une telle bielle |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP2021600A1 (fr) |
| FR (1) | FR2901585B1 (fr) |
| WO (1) | WO2007138205A1 (fr) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE487138C (de) * | 1929-11-29 | Adolf Luethi | Pleuelstange mit im Kolbeninnern angeordneten Stossdaempfungsfedern | |
| FR637617A (fr) * | 1926-11-13 | 1928-05-04 | Aviation Louis Breguet Sa | Tête de bielle pour moteurs à grande vitesse |
| FR746124A (fr) * | 1931-11-20 | 1933-05-23 | Moteur à explosion avec réglage automatique de la chambre de compression | |
| FR1220062A (fr) * | 1958-12-23 | 1960-05-23 | Perfectionnement apporté aux moteurs à pistons | |
| US3070392A (en) * | 1961-05-11 | 1962-12-25 | Gen Motors Corp | Connecting rod assembly |
-
2006
- 2006-05-29 FR FR0651929A patent/FR2901585B1/fr not_active Expired - Fee Related
-
2007
- 2007-05-04 WO PCT/FR2007/051216 patent/WO2007138205A1/fr not_active Ceased
- 2007-05-04 EP EP07765997A patent/EP2021600A1/fr not_active Withdrawn
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2007138205A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2901585B1 (fr) | 2009-02-13 |
| FR2901585A1 (fr) | 2007-11-30 |
| WO2007138205A1 (fr) | 2007-12-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| 17P | Request for examination filed |
Effective date: 20081114 |
|
| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR |
|
| AX | Request for extension of the european patent |
Extension state: AL BA HR MK RS |
|
| 17Q | First examination report despatched |
Effective date: 20090320 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
| 18D | Application deemed to be withdrawn |
Effective date: 20111201 |
|
| RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: SAUVAGE, OLIVIER Inventor name: RYMER, GUILLAUME |