• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates primarily to a heat engine, particularly a motor vehicle, comprising a system for varying a compression ratio of said engine comprising: - at least one eccentric part (21) rotatably mounted between a connecting rod and a crank pin of said crankshaft and provided with two toothed rings (28), - a first point of intersection (Om) between said axis of rotation (Rm) of said eccentric part (21) on said crankpin and an eccentricity direction (d), - a second intersection point (Ob) between said axis of rotation (Rb) of said connecting rod on said eccentric part (21) and said eccentricity direction (d), - a plane (A) normal to said eccentricity direction (d). passing through said first point (Om) and separating said eccentric part (21) into a first half-shell (46) corresponding to a first eccentricity zone including said axis of rotation (Rb) of said connecting rod on said eccentric part ( 21), and a second half-rooster uille (47) corresponding to a second eccentricity zone, characterized in that said eccentric part (21) is configured such that its center of gravity is positioned along said eccentricity direction (d) in said second zone of eccentricity (47).
    公开号:FR3052188A1
    申请号:FR1655072
    申请日:2016-06-03
    公开日:2017-12-08
    发明作者:Matthieu Pogam；Julien Berger；Dren Arnaud Le
    申请人:Peugeot Citroen Automobiles SA；Gomecsys BV；
    IPC主号:
    专利说明:

    IMPROVED ECCENTRIC PIECE FOR A SYSTEM OF VARIATION IN THE COMPRESSION RATE OF AN ENGINE
    THERMAL
    The present invention relates to an improved eccentric part for a variation of the compression ratio of a heat engine system.
    [0002] Variation of the compression ratio is known as a function of the operating conditions of the engine. These compression ratio variation systems comprise a set of eccentric parts mounted on the crankshaft crank pins so as to cooperate each with a connecting rod end.
    [0003] A control device makes it possible to adjust the position of the eccentric pieces. For this purpose, the control device comprises an actuating shaft and a cascade of sprockets constituted by an actuating pinion integral with the actuating shaft, and intermediate pinions meshing on the one hand with the actuating pinion. and on the other hand with a toothed ring integral with the eccentric piece.
    Compared to a conventional engine, the addition of an eccentric piece between each connecting rod and crankpin crank generates the creation of a first hydrodynamic bearing (or other guides) between the crankpin and an inner periphery of the crankshaft. eccentric piece, and a second hydrodynamic bearing (or other guides), eccentric of the first bearing, between the connecting rod and the outer periphery of the eccentric eccentric part of the first bearing according to an eccentricity distance.
    At fixed compression ratio, for a fixed actuating shaft relative to the crankcase, each eccentric piece rotates at half the speed of the crankshaft allowing it to return to its angular position every two turns crankshaft, every four engine times. This half-speed ratio is ensured by an adequate choice of the number of teeth.
    At varying compression ratio, the phase shift of the first eccentric part, via the angular control of the actuating shaft relative to the frame, varies the angular position of the eccentric piece, so the position of the height of the piston during the four engine times and thus the compression ratio. This kinematics is also transmitted to the other eccentric parts gradually through trees and so-called transfer gears.
    However, with this type of architecture, the center of gravity of an eccentric piece is not naturally coincident with the two axes of the eccentric piece, namely the axis of the crank pin or the eccentric inner bearing and the crankshaft pin or the eccentric outer bearing. The half-speed of the eccentric parts and this misalignment of the center of gravity then imply an imbalance of the motor in a harmonic HO.5.
    In addition, this harmonic has an angular phasing (with respect to traditional harmonics of a motor) also continuously variable, because it is a function of the eccentric angle chosen, or the chosen compression ratio (and continuously variable). The amplitude of the harmonic depends on the offset of the center of gravity of the eccentric parts with respect to the axis of the crank pin and the axis of the big end, ie the position of this center of gravity with respect to a straight line. with the eccentricity direction passing through the center of the crank pin and the center of the big end, and the mass of the eccentric piece and the rotating mass of the connecting rod.
    The invention aims to reduce the amplitude of the parasitic harmonic by proposing a heat engine, particularly a motor vehicle, comprising a system for varying a compression ratio of the engine comprising: - a crankshaft comprising less a crankpin and at least one arm, at least one eccentric part rotatably mounted between a connecting rod and a crankpin and provided with two toothed rings, a first bearing between an outer periphery of the crankpin and an inner periphery of the crankshaft. eccentric part, - a second bearing eccentric with respect to the first bearing, between an inner periphery of the connecting rod and an outer periphery of the eccentric part, - an eccentricity direction passing through an axis of rotation of the eccentric part on the crankpin and an axis of rotation of the connecting rod on the eccentric piece, - a first point of intersection between the axis of rotation of the eccentric piece on the crank pin and the eccentricity direction, - a second point of intersection between the axis of rotation of the connecting rod on the eccentric part and the direction of eccentricity, - a plane normal to the direction of eccentricity passing through the first point and separating the eccentric part in a first half-shell corresponding to a first eccentricity zone including the axis of rotation of the connecting rod on the eccentric part, and a second half-shell corresponding to a second eccentricity zone. characterized in that the eccentric member is configured such that its center of gravity is positioned in the eccentricity direction in the second eccentricity zone.
    The invention thus makes it possible to reduce or eliminate the natural imbalance in harmonic of a variable compression ratio engine by controlling the center of gravity of the eccentric parts on the eccentricity direction line. In addition, the invention makes it possible to optimally define the center of gravity of the eccentric parts in order to promote the local and global balancing of the heat engine.
    According to one embodiment, the center of gravity is positioned at a distance measured from the first point such that it verifies the following relation:
    With: M_E being the mass of the eccentric, M_b_r being the rotating mass of the connecting rod, and D being the distance of eccentricity between the first point and the second point, and G being the distance between the first point and the center of gravity.
    According to one embodiment, the eccentric part comprises recesses for removing mass and / or inserts for adding mass and / or a variation in density between the first eccentricity zone and the second eccentricity zone. .
    According to one embodiment, at least one recess extending circumferentially is provided between an inner periphery and an outer periphery of at least one ring gear of the eccentric piece in the first half-shell.
    According to one embodiment, a series of blind holes are formed between the inner periphery and the outer periphery of at least one ring gear of the eccentric piece.
    According to one embodiment, at least one recess extending circumferentially and along a width of the eccentric piece is formed between the inner periphery and the outer periphery of the toothed crowns in the first half-shell.
    In one embodiment, holes having an axis of radial orientation relative to the axes of rotation of the eccentric piece and the connecting rod and symmetrical with respect to the eccentricity direction are formed in the first half-shell.
    According to one embodiment, the inserts are positioned between the inner periphery and the outer periphery of the toothed crowns in the second half-shell.
    In one embodiment, the inserts are screwed or fitted inside hole or correspondingly shaped threads.
    The invention will be better understood on reading the description which follows and the examination of the figures that accompany it. These figures are given for illustrative but not limiting of the invention.
    Figure 1 is a side view illustrating the integration into the crankshaft of a compression rate variation system of a heat engine according to the present invention; Figure 2 is a front view in section illustrating two angular positions of an eccentric part of the compression ratio variation system of a heat engine according to the present invention; Figure 3 is a perspective view of the compression rate variation system of a heat engine according to the present invention without the crankshaft; Figures 4a to 4d are perspective views of an eccentric part according to the invention whose balancing has been obtained by removal of material at the first half-shell; Figure 5 is a perspective view of an eccentric part according to the invention, the balancing has been obtained by removal and addition of material respectively in first and second half-shell.
    [0025] Figure 1 shows a crankshaft 12 incorporating a system 11 for varying the compression ratio to vary the compression ratio according to the operating conditions of the engine. The system 11 thus makes it possible to operate a heat engine at a high compression ratio under low load conditions in order to improve its efficiency. Under high load operating conditions, the compression ratio can be decreased to avoid jolts.
    More specifically, the crankshaft 12 X axis is intended to be rotatably mounted on a motor housing by means of bearings. The crankshaft 12 comprises a plurality of crank pins 13, and journals 14, separated by arms 17 extending substantially perpendicular to the axis X. The crankshaft 12 further has a front end intended to be rotatably connected with a crankshaft. pulley 18. An inertia flywheel (not shown) is rotatably connected to the rear end of the crankshaft 12.
    Eccentric parts 21 are rotatably mounted on the crank pins 13 via a through opening 22 formed in each eccentric part 21. As can be seen better in FIG. 3, each eccentric part 21 also comprises a central portion 30 of shape. generally annular axial orientation and two toothed rings 28 extending radially on either side of the central portion 30.
    As shown in Figure 2, a first hydrodynamic bearing 41 is located between an outer periphery of the crankpin 13 of the crankshaft 12 and an inner periphery 29 of the central portion 30 of the eccentric part 21. A second hydrodynamic bearing 44 , eccentric with respect to the first bearing 41, is located between an inner periphery of a connecting rod 26 and an outer periphery 25 of the central portion 30 of the eccentric part 21 eccentric with respect to the first bearing 41. In this case, the periphery outer 25 is intended to cooperate with the periphery of a large end of the rod 26, which has its small end rotatably connected with a piston 27 of the engine.
    An eccentricity direction d is defined as being the straight line passing through an axis of rotation Rm of the eccentric part 21 on the crank pin 13 and an axis of rotation Rb of the connecting rod 26 on the eccentric part 21 as well as, of preferably, by the median plane of the eccentric part 21 normal to the axes Rm and Rb. A first point Om corresponding to the intersection between the axis of rotation Rm of the eccentric part 21 on the crankpin 13 (ie the axis of the first bearing 41) and the direction of eccentricity d is also defined. A second point Ob corresponds to the intersection between the axis of rotation Rb of the connecting rod 26 on the eccentric part 21 (the axis of the second bearing 44) and the direction of eccentricity d.
    A plane A, normal to the direction of eccentricity d, passing through the first point Om separates the eccentric part 21 into a first half-shell 46 corresponding to a first eccentricity zone including the axis of rotation Rb of the connecting rod 26 on the eccentric part 21, and a second half-shell 47 corresponding to a second eccentricity zone.
    In order to reduce or eliminate a natural imbalance in harmonic of the engine to you iv Ho nrtmrM'ûecirtn v / orioKlo Ιο ιλιολο ûvnûntrim ια Oi oot ΛΛηίΪΓΐιιι · ΰΰ Ho folio fooon ni io its center of gravity CG is positioned in the direction of eccentricity d in the second eccentricity zone 47.
    Preferably, the center of gravity CG is positioned at a distance G measured from the first point Om such that it verifies the following relation:
    With: M_E being the mass of the eccentric, M_b_r being the rotating mass of the connecting rod, D being the eccentricity distance between the first point Om and the second point Ob, and G being the distance between the first point Om and the center of gravity CG.
    In order to ensure optimal positioning of its center of gravity, the eccentric part 21 has recesses for removing mass and / or inserts to add mass and / or a variation in density between the first zone. eccentricity 46 and the second eccentricity zone 47.
    As shown in FIG. 4a, in order to reduce the mass in first half-shell 46, one or more circumferentially extending recesses 48 are formed between the inner periphery and the outer periphery of the toothed rings 28 of the eccentric part 21 in the first half-shell 46. These recesses 48, made in the wall of the ring gear 28, thus have a "bean" shape and are axially blind.
    In another embodiment shown in Figure 4b, a series of blind holes 49 are formed between the inner periphery and the outer periphery of the ring gear 28 of the eccentric part 21. The holes 49 of the series having an axis extending parallel to the axes Rm and Rb may have a substantially identical diameter and be located along the same circumference. Alternatively, the holes 49 may have different diameters and be positioned at different circumferences. The shape of the holes 49 depends on the application and in particular on the configuration of the eccentric part 21.
    In another embodiment shown in Figure 4c, one or more recesses 50 extending circumferentially and along a width of the eccentric part 21 are formed between the inner periphery and the outer periphery of the ring gear 28. in the first half-shell 46. These recesses 50, made in the wall of the toothed rings 28 and have a form of "bean" through.
    In another embodiment shown in FIG. 4d, holes 51 having a radial orientation axis with respect to the axes Rm and Rb and symmetrical with respect to the eccentricity direction d are made in the first half shell 46. These holes 51 are formed in an annular wall of axial orientation of the central portion 30. Depending on the application and the need for balancing, these holes 51 may be blind or through.
    Apart from the creation of recesses over the entire width of the first half-shell 46, it is possible to make the same deletions of material on the second half-shell 47 and fill the voids with inserts 52 having a greater density than the initial material of the eccentric part 21, as shown in Figure 5.
    The eccentric part 21 being steel with a density of about 7500 kg / m3, the second half-shell 47 may include inserts 52, for example screwed or fitted inside holes or tapped holes. 54 of corresponding shape, positioned between the inner periphery and the outer periphery of the toothed rings 28 in the second half-shell 47.
    This allows an increase in mass of the second half-shell 47. All inserts 52 to higher density can be envisaged, for example platinum with a density of about 21450 kg / m3, uranium d a density of about 18700 kg / m3, tungsten with a density of about 19,300 kg / m3.
    The eccentric parts 21 may be monobloc parts. In this case, the crankshaft 12 is subdivided into several parts to allow assembly of the assembly. Alternatively, the crankshaft 12 is monobloc, while the eccentric parts 21 are formed of two half-shells 46, 47 mounted around each crankpin 13 as described above.
    As shown in FIG. 3, a control device 31 makes it possible to adjust the angular position of the eccentric parts 21. For this purpose, the control device 31 comprises an actuating shaft 32 and a cascade of gears constituted by an actuating gear 33 mounted on the actuating shaft 32, and at least one intermediate gear 36 meshing on the one hand with the actuating pinion 33 and on the other hand with a ring gear 28. The intermediate gear 36 is mounted on the arm 17 on the side of an actuating device 57.
    In operation and when the actuating shaft 32 is fixed in rotation relative to the frame, the system has a fixed compression ratio configuration. In transient rate, the angular position of the eccentric piece 21 located on the side of the pulley 18 is controlled by the angular position of the actuating shaft 32 and thus pass to a new compression ratio point. For this purpose, the shaft 32 may be actuated for example by means of the actuating device 57, such as a wheel and worm gear, or any other means for moving the adapted shaft.
    In other words, the phase shift of the eccentric parts, via the angular control of the actuating shaft relative to the frame, varies the angular position of the eccentric part 21, and the position of the height HP of the piston 27 ( see Figure 2) during the four engine times and thus the compression ratio.
    A gear ratio between the drive pinion 33 and the ring gear 28 eccentric is substantially equal to 0.5. This makes it possible to guarantee a rotation of the eccentric part 21 at half speed with respect to the speed of rotation of the crankshaft 12.
    In addition, through the journals 14 of the crankshaft 12, shafts 58 and sprockets 59 called transfer transmit the same kinematics of the eccentric piece located on the side of the actuating shaft 32 from close to all on all the other eccentric parts of the crankshaft 12. To this end, the sprockets 59 mounted on the shafts 58 meshing with the ring gear 28 of the other eccentric parts.
    权利要求:
    Claims (9)
    [1" id="c-fr-0001]
    1. A thermal engine, in particular a motor vehicle, comprising a system (11) for varying a compression ratio of said engine comprising: - a crankshaft (12) comprising at least one crankpin (13) and at least one arm (17) - at least one eccentric part (21) rotatably mounted between a connecting rod (26) and a crankpin (13) of said crankshaft (12) and provided with two toothed rings (28), - a first bearing (41) between an outer periphery the crankpin (13) of said crankshaft (12) and an inner periphery (29) of said eccentric part (21), - a second bearing (44) eccentric with respect to said first bearing (41), between an inner periphery of said crank ( 26) and an outer periphery (25) of said eccentric member (21), - an eccentricity direction (d) passing through an axis of rotation (Rm) of said eccentric member (21) on said crankpin (13) and an axis of rotation (Rb) of said connecting rod (26) on said eccentric part (21), - a first point of intersection (Om) between said axis of rotation (Rm) of said eccentric part (21) on said crankpin (13) and said eccentricity direction (d), - a second intersection point (Ob) between said axis of rotation ( Rb) of said link (26) on said eccentric member (21) and said eccentricity direction (d), - a plane (A) normal to said eccentricity direction (d) passing through said first point (Om) and separating said eccentric part (21) into a first half-shell (46) corresponding to a first eccentricity zone including said axis of rotation (Rb) of said connecting rod (26) on said eccentric part (21), and a second half -coquille (47) corresponding to a second eccentricity zone, characterized in that said eccentric part (21) is configured such that its center of gravity (CG) is positioned along said eccentricity direction (d) in said second eccentricity zone (47).
    [2" id="c-fr-0002]
    2. Heat engine according to claim 1, characterized in that said center of gravity (CG) is positioned at a distance (G) measured from said first point (Om) as it verifies the following relation:

    With: ME being the mass of the eccentric, M_b_r being the rotating mass of the connecting rod, and D being the eccentricity distance between the first point (Om) and the second point (Ob), and G being the distance between the first point (Om) and the center of gravity (CG).
    [3" id="c-fr-0003]
    3. Heat engine according to claim 1 or 2, characterized in that said eccentric part (21) has recesses for removing from the mass and / or inserts to add mass and / or a density variation between said first eccentricity zone (46) and said second eccentricity zone (47).
    [4" id="c-fr-0004]
    4. Heat engine according to claim 3, characterized in that at least one recess (48) extending circumferentially is provided between an inner periphery and an outer periphery of at least one ring gear (28) of said part. eccentric (21) in said first half-shell (46).
    [5" id="c-fr-0005]
    5. Heat engine according to claim 3 or 4, characterized in that a series of blind holes (49) are provided between said inner periphery and said outer periphery of at least one ring gear (28) of said eccentric piece (21). ).
    [6" id="c-fr-0006]
    6. Heat engine according to any one of claims 3 to 5, characterized in that at least one recess (50) extending circumferentially and along a width of said eccentric part (21) is formed between said inner periphery. and said outer periphery of said ring gear (28) in the first half-shell (46).
    [7" id="c-fr-0007]
    7. Heat engine according to any one of claims 3 to 6, characterized in that holes (51) having an axis of radial orientation relative to the axes (Rm, Rb) of rotation of said eccentric part (21) and of said connecting rod (26) and symmetrical with respect to said eccentricity direction (d) are formed in said first half-shell (46).
    [8" id="c-fr-0008]
    8. Heat engine according to any one of claims 3 to 7, characterized in that said inserts (52) are positioned between said inner periphery and said outer periphery of said ring gear (28) in said second half-shell (47).
    [9" id="c-fr-0009]
    9. Thermal engine according to claim 8, characterized in that said inserts (52) are screwed or fitted inside hole or tappings (54) of corresponding shape.
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    同族专利:
    公开号 | 公开日
    FR3052188B1|2018-06-15|
    WO2017207903A1|2017-12-07|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    WO2013160501A1|2012-04-23|2013-10-31|Garcia Sanchez Eduardo|Kinematic chain for positioning eccentric bearings which rotate on the crankpins of the crankshaft of an engine with a variable compression ratio|
    EP2902603A1|2014-01-31|2015-08-05|Gomecsys B.V.|An internal combustion engine including variable compression ratio|
    EP2907986A1|2014-02-18|2015-08-19|Gomecsys B.V.|Afour-stroke internal combustion engine with variable compression ratio|
    EP2930329A1|2014-04-08|2015-10-14|Gomecsys B.V.|An internal combustion engine including variable compression ratio|WO2019155121A1|2018-02-06|2019-08-15|Masinova Oy|An arrangement and a method for a robot device|
    EP3608523A1|2018-08-09|2020-02-12|Gomecsys B.V.|An eccentric member and a v-type internal combustion engine|
    WO2021016690A1|2019-07-28|2021-02-04|Goncalves Pereira Almir|Device for variation of compression ratio|
    法律状态:
    2017-05-22| PLFP| Fee payment|Year of fee payment: 2 |
    2017-12-08| PLSC| Search report ready|Effective date: 20171208 |
    2018-05-25| PLFP| Fee payment|Year of fee payment: 3 |
    2020-05-20| PLFP| Fee payment|Year of fee payment: 5 |
    2021-05-19| PLFP| Fee payment|Year of fee payment: 6 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1655072A|FR3052188B1|2016-06-03|2016-06-03|IMPROVED ECCENTRIC PIECE FOR A VARIATION SYSTEM OF THE COMPRESSION RATE OF A HEAT ENGINE|
    FR1655072|2016-06-03|FR1655072A| FR3052188B1|2016-06-03|2016-06-03|IMPROVED ECCENTRIC PIECE FOR A VARIATION SYSTEM OF THE COMPRESSION RATE OF A HEAT ENGINE|
    PCT/FR2017/051328| WO2017207903A1|2016-06-03|2017-05-29|Improved eccentric part for a system for varying the compression rate of a combustion engine|
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