• 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:
    It is a connecting rod for an internal combustion engine with a shaft (1) and two connecting rod eyes (2, 3), of which the piston pin receiving a connecting rod eye (3) has a pin bearing (5) forming the eccentric (4), and with an actuating drive ( 20) for the eccentric (4). In order to create advantageous construction conditions, it is proposed that the eccentric (4) is mounted in a rotationally adjustable manner between two stop positions limited to at least approximately 180 °, in which the axis (7) of the pin bearing (5) is at least approximately in a common axial plane (FIG. 19) of the two connecting-rod eyes (2, 3), and in that the actuating drive (20) which can be driven via a hydraulic adjusting cylinder (16) comprises a toothed wheel (9) meshing with a toothed rim (8) of the eccentric (4).
    公开号:AT515419A4
    申请号:T50330/2014
    申请日:2014-05-12
    公开日:2015-09-15
    发明作者:
    申请人:Imt C Innovative Motorfahrzeuge Und Technologie Cooperation Gmbh；
    IPC主号:
    专利说明:

    The invention relates to a connecting rod for an internal combustion engine with a shaft and two connecting rods, of which the piston pin receiving a connecting rod eye has a pin bearing forming eccentric, and with an actuator for the eccentric.
    For varying the compression ratio, it is known in internal combustion engines, inter alia, to adjust the effective length of connecting the piston to the crankshaft connecting rod via a pin bearing for the piston pin forming eccentric. In order to enable a transition between different, to be set compression ratios, has already been proposed (DE 10 2005 055 199 A1) to connect the eccentric on opposite sides with two crank arms, where attack on actuating piston hinged push rods. About a switching valve, each acted upon via a check valve with hydraulic pressure actuating cylinder can be alternately connected to a return line, so that displaced at a pressure load of the connecting rod of the piston connected to the return line actuating cylinder hydraulic fluid from the cylinder chamber, while on the piston of the other actuating cylinder hydraulic fluid in the Cylinder chamber is sucked with the result that the eccentric is rotated. By switching the switching valve, an opposite rotational adjustment of the eccentric can be initiated, wherein the locking of the return of both actuating cylinders, the respective rotational position of the eccentric is held hydraulically. A disadvantage of this known construction is that due to the adjustment over two opposing push rods the possible angle of rotation for the eccentric is limited and that the forces acting on the connecting rod load the adjusting mechanism, even when trying through a Dämp tion of the adjusting movement of the eccentric is to reduce the loads during the eccentric adjustment.
    The invention is therefore based on the object, a connecting rod for an internal combustion engine in such a way that when using an eccentric for adjusting the compression ratio of the internal combustion engine via a change in the effective Pleuellänge a load of the actuator via the eccentric in the selected compression position can be excluded.
    Starting from a connecting rod of the type described above, the invention solves the stated object in that the eccentric is rotatably mounted between two at least approximately offset by 180 °, stop-limited working positions in which the axis of the pin bearing at least approximately in a common axial plane of the two connecting rods is located, and that the driven via a hydraulic actuating cylinder actuating drive comprises a meshing with a ring gear of the eccentric gear.
    By the rotational adjustment of the eccentric between two angular positions offset by 180 ° to each other, in which the axes of the pin bearing are each in a common axial plane of the two connecting rods, it is ensured that the conducive to the internal combustion engine Pleuelbelastungen no or at a Pleuelschrägstellung only a small torque can exert on the eccentric, so that the actuator for the eccentric remains virtually stress-free in its working positions. This applies not only to the geometric dead center of the eccentric, in which the axis of the pin bearing is located in the common axial plane of the two connecting rod, but also in a vicinity of these dead center. Due to the predetermined in the dead center by a stop working positions of the eccentric no special holding forces are required for the locking of these working positions, which brings simple design conditions with it, especially if a stop-limited Übertotpunktlage is provided for the two working positions.
    Because of the rotational adjustment at least approximately 180 ° can be used in comparison to a limited rotational adjustment of the eccentric at a constant rate of change of the compression ratio eccentric with a lower eccentricity and therefore smaller sizes can be ensured.
    Working positions in the area of the two dead center positions of the eccentric, however, require corresponding actuating drives for the eccentric. By providing a meshing with a ring gear for the eccentric gear can be used structurally simple drivable via a hydraulic actuating cylinder actuators use that can be accommodated in the connecting rod shaft to save space. To implement the linear adjusting movement of a hydraulic adjusting cylinder into a rotational movement required for the eccentric adjustment, a toothed rack meshing with a toothed wheel can advantageously be provided. The required for a rotational adjustment by 180 ° travel of the rack depends on the diameter of the meshing with the rack gear. For this reason, it is recommended to drive the gear meshing with the ring gear via a shaft on which the gear driven by the rack sits, so that for the Exzenterverstellung a corresponding translation can be used.
    However, the actuator driven by the hydraulic actuating cylinder can also comprise a king shaft driven by a rack, via which the eccentric drive is then discharged, for example via a worm gear. It is only important that the actuator converts the linear piston movement of the hydraulic actuating cylinder into a rotary motion, for which under certain circumstances a push rod transmission can be used. In general, however, there is a requirement that the actuator may not change the dimensions of the connecting rod in a degree threatening its usual installation.
    Particularly advantageous construction conditions arise when the hydraulic actuator cylinder has a double-acting piston, because in this case the rotational adjustment of the eccentric can be made in both directions by a corresponding pressurization of the actuating cylinder via a corresponding order switching valve, on the two working positions of the eccentric simply hydraulically lockable. But it can also be used a control cylinder, which is biased against the force of a return spring with hydraulic pressure medium, so that the one operating position is held on the return spring.
    In the drawing, the subject invention is illustrated, for example, and that a connecting rod according to the invention is shown in a schematic section.
    The connecting rod schematically illustrated for an internal combustion engine has in a conventional manner a shaft 1 with a connecting rod 2 for a crank pin of the crankshaft and with a connecting rod 3 for a piston pin. To adjust the effective connecting rod length an eccentric 4 is rotatably mounted coaxially to the connecting rod 3 in the connecting rod 3 for the piston pin, which forms an eccentric pin bearing 5. The axis of the Pleuelauges 3 and the axis of rotation of the eccentric 4 is denoted by 6. The axis of the pin bearing 5 is indicated by the reference numeral 7.
    For the rotational adjustment of the eccentric 4, this is provided with a ring gear 8, which meshes with a gear 9. The gear 9 is mounted in a connecting rod pocket 10 on a shaft 11 on which a meshing with a rack 12 gear 13 is rotatably mounted. The guided in a guide 14 of the connecting rod 1 rack 12 is connected to the piston 15 of a hydraulic actuating cylinder 16 which can be acted upon via a switching valve 17 with a hydraulic pressure medium. The supply via a circumferential groove 18 of the connecting rod 2 for the crankpin with hydraulic pressure medium switching valve 17 applied depending on the selected switching position optionally one of the two piston sides of the actuating cylinder 16. The control of the changeover valve 17 can be done in a conventional manner via a hydraulic control line, not shown for reasons of clarity , which switches the switching valve 17, for example, against the force of a return spring, so that depending on the control of the switching valve 17, the rack 12 is displaced in one or the other direction.
    The eccentric 4 is stop-limited mounted rotationally adjustable between two angular positions offset by 180 ° from each other. These working positions are characterized in that in them the axis 7 of the pin bearing 5 in each case in the common axial plane 19 of the two connecting rods 2 and 3, so that at an axial Pleuelbelastung by the combustion pressure of the internal combustion engine or by inertia forces almost no torque on the eccentric can become effective and therefore the actuator 20 formed by the rack 12 and the rack 12 meshing gear 13 is hardly exposed to external stress. This applies both to the drawn, a higher compression ratio corresponding eccentric position as well as for the eccentric position, which corresponds to a lower compression ratio due to the shortened by twice the eccentricity of the pin bearing 5 relative to the eccentric 4 stub length. For the actuator 20 thus simple design requirements, resulting from the fact that the meshing with the ring gear 8 of the eccentric gear 4 9 is driven via an actuator 20 by a hydraulic actuating cylinder 16, the required rotational adjustment of the eccentric 4 by 180 ° in each case can be easily ensured.
    The invention is of course not limited to the illustrated embodiment. Thus, the two working positions of the eccentric 4 could also be determined by an over-center position of the eccentric 4. In the vicinity of the dead center, the torque loads of the eccentric 4 remain limited, so that the advantages associated with the dead center of the eccentric 4 advantages can be used. In addition, the adjusting movement of the adjusting cylinder 16 need not be converted via a rack in a required for the drive of the gear 9 rotational movement.
    权利要求:
    Claims (4)
    [1]
    Patent Attorneys Dipl.-Ing. Helmut Hübscher Dipl.-Ing. Karl Winfried Hellmich Spittelwiese 4, 4020 Linz (39721) II Patent Claims 1. Connecting rod for an internal combustion engine with a shaft (1) and two connecting rod eyes (2, 3), of which the connecting rod eye receiving a piston pin (3) has a bolt bearing (5) having eccentric (4), and with an actuating drive (20) for the eccentric (4), characterized in that the eccentric (4) is rotatably mounted between two at least approximately offset by 180 °, stop-limited working positions, in which the axis (7) of the pin bearing (5) at least approximately in a common axial plane (19) of the two connecting rods (2, 3), and that via a hydraulic actuating cylinder (16) drivable actuator (20) with a sprocket (8) of the Exzenters (4) comprises meshing gear (9).
    [2]
    2. Connecting rod according to claim 1, characterized in that the eccentric (4) occupies a stop-limited over-center position in the two working positions.
    [3]
    3. Connecting rod according to claim 1 or 2, characterized in that the adjusting drive (20) connected to the piston (15) of the adjusting cylinder (16), with a gear (13) meshing rack (12).
    [4]
    4. Connecting rod according to one of claims 1 to 3, characterized in that the hydraulic actuating cylinder (16) has a double-acting piston (15). Linz, May 12, 2014 IMT-C Innovative Motor Vehicles and Technology - Cooperation GmbH by: / DI Helmut Hübscher / (electronically signed)
    类似技术:
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    同族专利:
    公开号 | 公开日
    US10054041B2|2018-08-21|
    EP3143266A1|2017-03-22|
    AT515419B1|2015-09-15|
    WO2015172168A1|2015-11-19|
    EP3143266B1|2018-03-07|
    US20170037778A1|2017-02-09|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    JPH06212993A|1993-01-18|1994-08-02|Mitsubishi Motors Corp|Variable compression ratio device of engine|
    DE19841381A1|1997-10-31|1999-05-06|Fev Motorentech Gmbh & Co Kg|Piston engine with adjustable compression ratio|
    JP2000038937A|1998-07-21|2000-02-08|Toyota Motor Corp|Variable compression ratio device for internal combustion engine|
    DE102005055199A1|2005-11-19|2007-05-24|Fev Motorentechnik Gmbh|Reciprocating internal combustion engine e.g. commercial vehicle diesel engine, has eccentric tappet moved along length of piston rod, where changeable resistor affects adjustment movement of tappet and effects adjustment movement of tappet|DE102016124750A1|2016-12-19|2018-06-21|Schaeffler Technologies AG & Co. KG|Device for changing the effective length of a connecting rod during the operation of a reciprocating internal combustion engine|
    DE102017000244A1|2017-01-12|2018-07-12|Audi Ag|Method for producing an internal combustion engine and internal combustion engine assembly kit for producing an internal combustion engine|
    DE102016122553B4|2015-12-28|2022-02-24|Toyota Jidosha Kabushiki Kaisha|Variable length connecting rods and internal combustion engine with variable compression ratio|JPS6343397Y2|1982-09-03|1988-11-11|
    JPS6343398Y2|1982-09-04|1988-11-11|
    EP1424486A1|2003-03-24|2004-06-02|Siegfried Meyer|Structure of high-performance engine|
    US7789050B2|2003-12-23|2010-09-07|Institut Francais Du Petrole|Device and method for varying a compression ratio of an internal combustion engine|
    DE102012002832A1|2012-02-11|2013-08-14|Daimler Ag|Adjustable system for adjusting piston stroke of lifting cylinder engine, has tooth shaft sleeve locking position bolt, which is transferred from locking position into unlocking position by displacement in direction of central axis|AT15426U1|2015-08-10|2017-08-15|Avl List Gmbh|Reciprocating engine, in particular internal combustion engine|
    EP3390794B1|2015-12-14|2019-06-26|AVL List GmbH|Length-adjustable connecting rod with electromagnetically-actuatable switching valve|
    AT519011B1|2016-05-31|2018-03-15|Avl List Gmbh|reciprocating engine|
    DE102016008306A1|2016-07-06|2018-01-11|Avl List Gmbh|Connecting rod with adjustable connecting rod length|
    DE102017107682A1|2016-08-16|2018-02-22|ECO Holding 1 GmbH|Connecting rod for a variable compression internal combustion engine|
    AT15890U1|2016-09-30|2018-08-15|Avl List Gmbh|Multi-part connecting rod with adjustable connecting rod length|
    AT519360B1|2017-02-24|2018-06-15|Avl List Gmbh|Method for operating a reciprocating piston engine with at least one hydraulically length-adjustable connecting rod|
    DE102017107731A1|2017-04-10|2018-10-11|Avl List Gmbh|Length adjustable connecting rod for a piston engine|
    法律状态:
    2022-01-15| MM01| Lapse because of not paying annual fees|Effective date: 20210512 |
    优先权:
    申请号 | 申请日 | 专利标题
    ATA50330/2014A|AT515419B1|2014-05-12|2014-05-12|Connecting rod for an internal combustion engine|ATA50330/2014A| AT515419B1|2014-05-12|2014-05-12|Connecting rod for an internal combustion engine|
    EP15744467.0A| EP3143266B1|2014-05-12|2015-05-07|Connecting rod for an internal combustion engine|
    PCT/AT2015/050114| WO2015172168A1|2014-05-12|2015-05-07|Connecting rod for an internal combustion engine|
    US15/304,152| US10054041B2|2014-05-12|2015-05-07|Connecting rod for an internal combustion engine|
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