• 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 an eccentric part (18) for a variation of the compression ratio of an internal combustion engine system comprising: a body (19) made from two half-shells (22) assembled together, said body (19) comprising an eccentric face (23) with respect to an inner face (27) of said body (19), and two toothed rings (24) positioned on either side of said eccentric face (23), characterized in that said contact faces (50, 51) are centered relative to one another by means of an indexing device (101, 102) and / or relief irregularities (52). complementary shape formed in said contact faces (50, 51).
    公开号:FR3036146A1
    申请号:FR1554175
    申请日:2015-05-11
    公开日:2016-11-18
    发明作者:Julien Berger；Matthieu Pogam；Gooijer Lambertus Hendrick De；Sander Wagenaar；Willem-Constant Wagenvoort；Vincent Bonnet
    申请人:Peugeot Citroen Automobiles SA；Gomecsys BV；
    IPC主号:
    专利说明:

    [0001] FIELD OF THE INVENTION The present invention relates to an eccentric part for a variation system of the compression ratio of a heat engine. The document EP12152309.6 teaches the realization of a system for varying the compression ratio depending on the operating conditions of the engine. This compression ratio variation system comprises in particular a set of eccentric parts mounted on the crank pin cranks so as to cooperate each with a connecting rod end. As illustrated in Figure 1, the eccentric parts 1 are split into two half-shells 2 to allow their assembly on a one-piece crankshaft. For this purpose, the half-shells 2 are assembled on the crankshaft by fitting locking elements 3 inside the housings 4 formed in the half-shells 2. In such a connection, the bearing surfaces of the male parts (corresponding to the heads of the elements 3) and the female parts (corresponding to the housings 4) have respective angles of lateral inclinations, so that the more the male part is deep in the female part, the more there is binding force The invention aims to improve such a device by proposing an eccentric part for a variation system of the compression ratio of an internal combustion engine comprising: a body made from two half-shells shells assembled together, said body comprising an eccentric face with respect to an internal face of said body, and two toothed rings positioned on either side of said eccentric and concentric face; ues of said inner face, characterized in that said contact faces are centered relative to each other by means of an indexing device and / or complementary shape of irregularities relief formed in said contact faces. The invention thus ensures axial and radial positioning of the two half-shells with respect to each other before and after assembly, via a centering provided by the cooperation of the contact faces. two half-shells and / or the indexing device. In one embodiment, said indexing device comprises at least one pin for cooperating with corresponding recesses formed in said contact faces. [0007] In one embodiment, said irregularities are constituted by micro-irregularities resulting from a breakage of said body of said eccentric piece to obtain said two half-shells. Such a configuration thus avoids the use of indexing pads. In addition, the irregularities make it possible to improve the resistance to the peaks of loads observable during the explosion phases of the heat engine. According to one embodiment, said irregularities consist of machined shapes made in said contact faces. [0009] In one embodiment, said irregularities have complementary wave or triangle shapes. According to one embodiment, said piece further comprises at least one locking member fitted inside a corresponding cavity partially formed in each half-shell. According to one embodiment, at least one bore is made partly in said locking element and partly in a corresponding half-shell. This allows the extraction of the locking element by inserting a screw inside the corresponding bore. According to one embodiment, only the portion of said bore formed in said locking element is threaded. According to one embodiment, at least one opening opening on the one hand in said cavity and on the other hand in a space between said two ring gears is formed in a half-shell of said body. This allows the disassembly of the locking element by allowing the insertion of a punch from the rear of the cavity. In one embodiment, said locking member is configured to operate in a plastic deformation zone. In one embodiment, said locking element comprises a central portion and two end heads extending on either side of the central portion. The invention also relates to an internal combustion engine of a motor vehicle characterized in that said engine comprises: - a crankshaft, and - a system for varying a compression ratio of said engine comprising at least 5 an eccentric piece as previously defined mounted on a crank pin of said crankshaft. The invention will be better understood from reading the following description and examining the figures that accompany it. These figures are given for illustrative but not limiting of the invention. FIG. 1, already described, is an exploded perspective view of an eccentric part according to the state of the art; Figure 2 is a perspective view illustrating the integration of the compression ratio variation system of a heat engine according to the present invention along the entire length of the crankshaft; FIG. 3 is a perspective view of the compression ratio variation system of a heat engine according to the present invention without the crankshaft; Figure 4 is an exploded perspective view of an eccentric part according to the present invention; [0022] FIG. 5 is a detailed view of the surface state of the contact faces of the two half-shells of the eccentric part according to the invention; Figure 6a is a sectional view of the eccentric part according to the invention illustrating a first embodiment of a disassembly system of the locking elements; FIG. 6b is a detailed view of the shape of the bore made in the locking element 25 and in the corresponding half-shell for the implementation of the first embodiment of the disassembly system; Figure 7 is a side view of the eccentric part according to the invention illustrating a second embodiment of the disassembly system of the locking elements. In FIGS. 2 to 7, identical, similar or similar elements retain the same reference from one figure to another. FIG. 2 shows a perspective view of a system 11 for varying the compression ratio integrated into a crankshaft 12. The system 11 makes it possible to operate an internal combustion engine at a high compression ratio under conditions low load to improve its performance. Under high load operating conditions, the compression ratio may be decreased to reduce the risk of self-ignition of the mixture. More specifically, the crankshaft 12 of the X-axis motor is intended to be rotatably mounted on a crankcase of the engine by means of bearings. The crankshaft 12 comprises a plurality of crank pins 13, and journals 14 separated by flanges 15 extending substantially perpendicular to the axis X. The crankshaft 12 further has a front end intended to be rotatably connected. with a pulley. An inertia flywheel (not shown) is rotatably connected to the rear end of the crankshaft 12. [0030] Eccentric pieces 18 are rotatably mounted on the crank pins 13. As is best seen in FIGS. 4, each eccentric part 18 comprises a body 19 made from two half-shells 22 assembled together. The body 19 comprises an external eccentric face 23 and two toothed rings 24 positioned on either side of the eccentric face 23 and concentric with the internal face 27. The external eccentric face 23 is intended to cooperate with a large end of a connecting rod, which further has a small end rotatably connected with a piston of the engine. Preferably, bearings 100 are intended to be mounted between an inner face 27 of the body 19 and an outer periphery of the crankpin 13 to form a hydrodynamic bearing. The inner face 27 and the faces of the pads 100 have an axis substantially coincident with the axis of the crankpin 13, while the outer face 23 is eccentric with respect to the inner face 27 and thus with respect to the crankpin 13. [0032] By Moreover, a control system 30 of the angular position of the eccentric parts 18 comprises an actuating shaft 31 and a cascade of sprockets constituted by an actuating pinion 32 mounted on the actuating shaft 31, and a 3036146 5 intermediate gear 33, said satellite, to reverse the direction of rotation, meshing on the one hand with the actuating gear 32 and on the other hand with a ring gear 24 of the corresponding eccentric part 18 (see Figure 3). In operation and when the actuating shaft 31 is fixed in rotation with respect to the frame, the system 30 has a fixed compression ratio configuration. In transient rate, the angular position of the eccentric piece 18 located on the side of the pulley is controlled by the angular position of the actuating shaft 31 and thus pass to a new compression ratio point. For this purpose, the actuating shaft 31 can be actuated for example by means of a wheel and worm gear, or any other moving means adapted to the application. In addition, through the journals 14 of the crankshaft 12, shafts 36 and pinions 37, called transfer, transmit the same kinematics of the eccentric part 18 located on the side of the actuating shaft 31 of close in. close to all the other eccentric parts 18 of the crankshaft 12. To this end, the pinions 37 mounted on the transfer shafts 36 meshing with a ring 24 of an eccentric piece 18 upstream and a ring 24 of a downstream eccentric piece 18 corresponding. In the present case, as can clearly be seen in FIG. 4, each half-shell 22 has the shape of a half-ring comprising a corresponding portion of the eccentric face 23 and a portion of each of the two rings. 24. These 20 half-shells 22 are intended to come each to be plated substantially on the half of the circumference of the hydrodynamic bearing formed by the internal bearings 100 of a crankpin 13. In order to ensure the maintenance of the half-shells 22, shells 22 around the crank pin 13, the piece 18 comprises locking elements 40, here four in number, each fitted inside a corresponding cavity 43 at a contact zone between the two half-shells 22. Each cavity 43 is made in part in each half-shell 22. [0037] Each locking element 40 has a central portion 46 and two end heads 47 extending on either side of the central portion 46 . The part Central unit 46 has a substantially parallelepipedal shape with planar faces. Each element 40 thus generally has a shape known as "dog bone". In addition, as shown in FIG. 5, the contact faces 50, 51 between the two half-shells 22 located at the ends of each half-shell 22 have irregularities 52 of shape relief. complementary. Thus, irregularities projecting from a contact face 50, 51 of one of the half-shells 22 cooperate with corresponding recesses in the contact face 50, 51 of the other half-shell 22. The irregularities 52 extend over at least 50% of the contact faces 50, 51 between the half-shells 22, and preferably substantially all of the contact faces 50, 51. [0039] The invention thus makes it possible to ensure controlled positioning of the two half-shells 22 relative to one another before assembly, via a centering provided by the cooperation of the contact faces 50, 51 of the two half-shells 22. In addition, the irregularities 52 allow to improve the resistance to the peak loads observable during the explosion phases of the engine. The irregularities 52 consist for example of micro-irregularities resulting from a breakage of the body 19 of the eccentric part 18 to obtain the two half-shells 22. Alternatively, the irregularities 52 consist of machined shapes made in the contact faces 50, 51. In this case, the irregularities 52 may for example have wave shapes or complementary triangle shapes. These wave or triangle shapes can be made for example by wire cutting. In this case, the first draft of the teeth will be made to take into account the removal of material from the cut. In the same way, the blank of the cavities 43 will be slightly longer to take into account the removal of material from the blank. Alternatively, the contact faces 50, 51 of the half-shells 22 are flat and centered with respect to one another by means of an indexing device comprising pins 101 intended to cooperate with corresponding recesses 102 in the contact faces 50, 51 of the half-shells 22 (see FIG. In a variant, the indexing device is used in addition to the irregularities 52 made in the contact faces 50, 51. In order to produce the eccentric part 18, the body 19 is fractured to obtain the two half-shells 22. Alternatively, the half-shells 22 forming the body 19 are obtained by a machining process. The half-shells 22 are then assembled together by means of the locking elements 40. In order to compensate for the deformations related to the mechanical assembly stresses generated by the insertion of the locking elements 40 into the cavities 43 corresponding, the inner diameter, the outer diameter, and the portion of the teeth located at the cavities 43 are ground by machining. An alternative method consists in assembling the male parts before the grinding machining so as to take into account the deformation of the half-shells 22 induced by the assembly. Once the machining grinding has been performed, the half-shells 22 are disassembled. For this purpose, in a first embodiment illustrated in FIGS. 6a and 6b, two bores 55 are provided at the ends 47 of each locking element 40. Each bore 55 is made partly in a head 47 of the element 40 and partly in the corresponding half-shell 22. Each bore 55 is blind with respect to the half-shell 22, that is to say that it is closed axially by the bottom of a cavity 43, and extends axially along the entire thickness of the locking member 40. As shown in Figure 6b, only the portion of the bore 55 formed in the locking member 40 is threaded. This allows the disassembly of the locking element 40 by the insertion 15 of a screw 56 inside each bore 55 which generates the extraction along the arrow F1 of the locking element 40 when of the screwing phase following the arrow F2 occurring after the abutment of one end of the screw 56 against the bottom of the cavity 43. Preferably, the screws 56 will be inserted into the bores 55 of the two ends and screwed simultaneously. As a variant, only one bore 55 is provided for each locking element 40. In a variant, the blind bores 55 are made partly in the locking element 40 in a zone other than the end head 47. In another embodiment illustrated in FIG. 7, an opening 59 opening on the one hand into the cavity 43 and on the other hand into the space between the two crowns 24 is formed in the body 19 of the eccentric part 18. It is thus possible to disassemble the locking element 40 by allowing the insertion of a punch 60 through the rear of the cavity 43, that is to say by passing the punch 60 between the two crowns 24, so as to disengage the element 40 from the cavity 43. Once ground and dismounted, the eccentric part 18 is then assembled on the corresponding crankpin 13 via the bearings 100. Preferably, the locking elements 40 used during of the machining grinding phase by new locking elements 40. The locking elements 40 can thus be used in their plastic deformation zone. This reduces the geometric tolerances of production. Indeed, the ratio between the force applied between the two half-shells 22 is less sensitive to the elongation of the male part in this operating zone. By "half-shells" is meant shells of complementary shape which, when assembled, extend at an angle of 360 degrees. Each half-shell 22 extends in this case substantially 180 degrees. However, alternatively, each half-shell 22 may extend over an angle greater or lesser than 180 degrees. 10
    权利要求:
    Claims (12)
    [0001]
    1. eccentric piece (18) for system (11) for varying the compression ratio of an internal combustion engine comprising: - a body (19) made from two half-shells (22) assembled together, said body (19) comprising an eccentric face (23) with respect to an inner face (27) of said body (19), and two toothed rings (24) positioned on either side of said eccentric face (23) and concentric of said inner face (27), characterized in that the contact faces (50, 51) are centered relative to one another by means of an indexing device (101, 102) and / or relief irregularities (52) of complementary shape formed in said contact faces (50, 51).
    [0002]
    2. Eccentric part according to claim 1, characterized in that said indexing device comprises at least one pin (101) intended to cooperate with recesses (102) corresponding made in said contact faces (50, 51).
    [0003]
    3. eccentric part according to claim 1 or 2, characterized in that said irregularities (52) are constituted by micro-irregularities resulting from a breakage of said body (19) of said eccentric piece (18) to obtain said two half shells (22).
    [0004]
    4. Eccentric part according to claim 1 or 2, characterized in that said irregularities (52) consist of machined shapes made in said contact faces (50, 51).
    [0005]
    5. Eccentric part according to claim 4, characterized in that said irregularities (52) have complementary wave or triangle shapes.
    [0006]
    6. eccentric part according to any one of claims 1 to 5, characterized in that said piece (18) further comprises at least one locking element (40) fitted inside a cavity (43) corresponding carried out partly in each half-shell (22).
    [0007]
    7. eccentric part according to claim 6, characterized in that at least one bore (55) is formed in part in said locking member (40) and partly in a corresponding half-shell (22). 3036146 10
    [0008]
    8. eccentric part according to claim 7, characterized in that only the portion of said bore (55) formed in said locking member (40) is threaded.
    [0009]
    9. Eccentric part according to claim 6, characterized in that at least one opening (59) opening on the one hand in said cavity (43) and on the other hand in a space between said two ring gear (24) is made in a half-shell (22) of said body (19).
    [0010]
    10. Eccentric part according to any one of claims 6 to 9, characterized in that said locking element (40) is configured to operate in a plastic deformation zone. 10
    [0011]
    11. Eccentric part according to any one of claims 6 to 10, characterized in that said locking element (40) comprises a central portion (46) and two end heads (47) extending from both sides. other of the central portion.
    [0012]
    12. Internal combustion engine of a motor vehicle characterized in that said engine comprises: - a crankshaft (12), and - a system (11) for varying a compression ratio of said engine comprising at least one eccentric part (18). ) as defined in any one of the preceding claims mounted on a crankpin (13) of said crankshaft (12).
    类似技术:
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    BE358855A|
    同族专利:
    公开号 | 公开日
    WO2016181046A1|2016-11-17|
    FR3036146B1|2017-05-26|
    EP3295004B1|2019-02-27|
    EP3295004A1|2018-03-21|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE2308000A1|1973-02-17|1974-09-05|Maschf Augsburg Nuernberg Ag|MULTI-PIECE GEAR|
    DE4415100A1|1994-04-29|1995-11-02|Bayerische Motoren Werke Ag|Assembly method for a body, in particular a toothing, on a one-piece, multi-cranked crankshaft of a reciprocating piston engine, especially an internal combustion engine|
    EP1624204A1|2004-08-05|2006-02-08|Ford Global Technologies, LLC, A subsidary of Ford Motor Company|Shaft having a transmission element attached to it|
    WO2013110700A1|2012-01-24|2013-08-01|Sleper, Joannes, Jacobus, Josephus|A reciprocating piston mechanism|
    CN202628727U|2012-05-25|2012-12-26|广州柴油机厂股份有限公司|Split crankshaft gear of high-power diesel engine|WO2019155147A1|2018-02-09|2019-08-15|Psa Automobiles Sa|Method for producing a dogbone-type female form in a mechanical component|
    EP3608523A1|2018-08-09|2020-02-12|Gomecsys B.V.|An eccentric member and a v-type internal combustion engine|
    DE102019130061A1|2019-11-07|2021-05-12|Bayerische Motoren Werke Aktiengesellschaft|Reciprocating internal combustion engine with a variable compression ratio|
    法律状态:
    2016-04-21| PLFP| Fee payment|Year of fee payment: 2 |
    2016-11-18| PLSC| Search report ready|Effective date: 20161118 |
    2017-04-21| PLFP| Fee payment|Year of fee payment: 3 |
    2018-04-23| PLFP| Fee payment|Year of fee payment: 4 |
    2018-06-29| CA| Change of address|Effective date: 20180312 |
    2018-06-29| CD| Change of name or company name|Owner name: GOMECSYS B.V., NL Effective date: 20180312 Owner name: PEUGEOT CITROEN AUTOMOBILES SA, FR Effective date: 20180312 |
    2020-02-14| ST| Notification of lapse|Effective date: 20200108 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1554175A|FR3036146B1|2015-05-11|2015-05-11|ECCENTRIC PIECE FOR A COMPRESSION RATE SYSTEM OF A THERMAL ENGINE|FR1554175A| FR3036146B1|2015-05-11|2015-05-11|ECCENTRIC PIECE FOR A COMPRESSION RATE SYSTEM OF A THERMAL ENGINE|
    EP16733132.1A| EP3295004B1|2015-05-11|2016-04-14|Eccentric component for a system for varying the compression ratio of a combustion engine|
    PCT/FR2016/050871| WO2016181046A1|2015-05-11|2016-04-14|Eccentric component for a system for varying the compression ratio of a combustion engine|
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