• 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 to a length-adjustable connecting rod (1) for a piston engine, with a first connecting rod section (2) assigned to the crankshaft and a second connecting rod section (3) assigned to the engine piston, wherein both connecting rod sections (2, 3) are inserted telescopically, wherein in a connecting rod portion, a cylinder (4) is formed, while the other connecting rod portion is provided with a piston (5) which is received in the cylinder (4) and relative to the cylinder (4) via circumferential seals (13, 14, 15) sealed , and further wherein the piston (5) defines at least one pressure chamber (8, 9) formed in the cylinder (4). It is envisaged that the circumferential seals are formed as hybrid seals, each with one of the respective pressure chamber (8, 9) facing the high pressure seal (13, 14) and arranged behind a low pressure seal (15).
    公开号:AT519803A2
    申请号:T50302/2018
    申请日:2018-04-10
    公开日:2018-10-15
    发明作者:Eder Marc
    申请人:Avl List Gmbh；Iwis Motorsysteme Gmbh & Co Kg；
    IPC主号:
    专利说明:

    Summary
    The invention relates to a length-adjustable connecting rod (1) for a piston engine, with a first connecting rod section (2) assigned to the crankshaft and a second connecting rod section (3) assigned to the engine piston, both connecting rod sections (2, 3) being telescopically inserted into one another, whereby A cylinder (4) is formed in a connecting rod section, while the other connecting rod section is provided with a piston (5) which is accommodated in the cylinder (4) and is sealed off from the cylinder (4) by means of circumferential seals (13, 14, 15) , and wherein the piston (5) delimits at least one pressure chamber (8, 9) formed in the cylinder (4). The peripheral seals are designed as hybrid seals, each with a high pressure seal (13, 14) facing the respective pressure chamber (8, 9) and a low pressure seal (15) arranged behind it.
    Fig. 1/6
    PP31848AT
    AVL List GmbH, iwis motorsysteme GmbH & Co. KG
    Length-adjustable connecting rod for a piston engine
    The invention relates to a length-adjustable connecting rod for a piston engine, with a first connecting rod section assigned to the crankshaft and a second connecting rod section assigned to the engine piston, both connecting rod sections being telescopically inserted into one another, with a cylinder being formed in one connecting rod section and the other connecting rod section with one Piston is provided, which is accommodated in the cylinder and is sealed off from the cylinder by means of circumferential seals, and the piston further delimits at least one pressure chamber formed in the cylinder.
    Length-adjustable connecting rods are provided in order to be able to adjust the compression ratio of an internal combustion engine. While a high compression ratio is desired for starting and in the partial load range, it is more desirable in full load operation to reduce the compression ratio in order to reduce the tendency of the engine to knock. A length-adjustable connecting rod of the type mentioned is described, for example, in WO2015 / 055582.
    High pressures can arise in the pressure chambers in front of and behind the piston due to the inertial forces and also the gas pressure forces of the internal combustion engine. For this purpose, the prior art knows so-called high-pressure seals, which are designed similarly to a piston ring and are inserted into a piston groove. These high-pressure seals usually have a clamping ring that presses the piston ring against the cylinder wall. These high pressure seals work well when there are high pressures in the pressure chambers delimited by the piston. Minor leakages cannot be completely ruled out.
    It is therefore an object of the present invention to improve a length-adjustable connecting rod of the type mentioned at the outset in such a way that the piston both seals against high pressures in the pressure chambers and also largely prevents leakages. This object is achieved according to the invention in that the peripheral seals are designed as hybrid seals, each with a high-pressure seal facing the respective pressure chamber and a low-pressure seal arranged behind it. Since there is only a slight pressure difference behind the high-pressure seal, a low-pressure seal, which usually consists of a closed polymer ring, is able to completely prevent any leakage.
    An embodiment in which the piston has two high-pressure seals with an intermediate low-pressure seal is particularly advantageous. In a particularly advantageous manner, this enables the entire sealing system to have two high-pressure seals, but only a single low-pressure seal. While the high pressure seals always only / 6
    PP31848AT
    AVL List GmbH, iwis motorsysteme GmbH & Co. KG are loaded from one side, depending on the piston position, the low pressure seal is loaded from one side and from the other side. This solution is not only particularly secure, it is also particularly space-saving.
    The sealing system described above is particularly suitable for a length-adjustable connecting rod, in which the cylinder in one connecting rod section has mechanical stops for the piston of the other connecting rod section, so that one of the stops defines a large connecting rod length, while the other stop defines a small connecting rod length. The pressure chambers, against which the sealing system must seal, are then on the side of the piston opposite the stop.
    The pressure chamber in the cylinder is advantageously connected to the oil supply of the internal combustion engine via a check valve. In this way, leakage oil can be compensated for; however, no oil can escape from the pressure chamber unintentionally.
    In order to switch the connecting rod from a short length to a long length or vice versa, each pressure chamber can advantageously be connected to a control valve through which the pressure chamber can be opened or closed. When a pressure chamber is opened, the piston moves in the direction of the unpressurized pressure chamber due to the mass or gas pressure forces that arise during operation of the internal combustion engine, until the piston rests against one of the stops.
    The invention is explained in more detail below on the basis of a single drawing.
    The single figure shows a length-adjustable connecting rod 1 for a piston engine, with a first connecting rod section 2 assigned to the crankshaft and a second connecting rod section 3 facing the engine piston. The first connecting rod section 2 has a cylinder 4, in which the second connecting rod section 3 with a piston 5 is immersed , At the open end of the cylinder 4, a stop 6 is provided which defines the long length of the adjustable connecting rod. The cylinder base forms a further stop 7, which defines the short length of the connecting rod. Pressure chambers 8 and 9, which are filled with engine oil, are formed between the two stops and the facing piston surface. For this purpose, each pressure chamber 8, 9 is connected to the oil supply of the internal combustion engine via a check valve 10, 11 and a 3/2-way valve 12.
    In the areas facing the respective pressure chambers 8, 9, the piston 5 each has a high-pressure seal 13 or 14 and an intermediate low-pressure seal 15.
    / 6
    PP31848AT
    AVL List GmbH, iwis motorsysteme GmbH & Co. KG
    The high-pressure seals 13, 14 are designed in a known manner, similar to a piston ring, while the low-pressure seal is a polymer seal.
    In the position shown in the drawing, the length-adjustable connecting rod 1 is in its extended long position. In this position, the lower pressure chamber 9 is blocked and pressurized. The piston is supported on the one hand on the oil cushion in this pressure chamber 9 and on the other hand on the upper stop 6 and is locked in this position. When the 3/2-way valve 12 is moved to the other switching position, the lower pressure chamber 9 is depressurized, so that the piston moves downward. Since the upper pressure chamber 8 is locked in this position, no engine oil can run off there, so that the upper pressure chamber 8, together with the lower stop 7, fixes the piston 5. That is the short connecting rod position.
    The sealing arrangement, as chosen for the piston, has the great advantage that a high-pressure seal seals off the pressure chamber to which high pressure is applied, while a low-pressure seal 15 is arranged behind the high-pressure seal, which has a double function, namely regardless of the piston position opposite which each pressurizes the pressure chamber. In this way, the sealing arrangement takes up very little space.
    / 6
    PP31848AT
    AVL List GmbH, iwis motorsysteme GmbH & Co. KG
    权利要求:
    Claims (6)
    [1]
    1. Length-adjustable connecting rod (1) for a piston engine, with a first connecting rod section (2) assigned to the crankshaft and a second connecting rod section (3) assigned to the engine piston, both connecting rod sections (2, 3) being telescopically inserted into one another, one in a connecting rod section Cylinder (4) is formed, while the other connecting rod section is provided with a piston (5) which is accommodated in the cylinder (4) and is sealed off from the cylinder by means of circumferential seals (13, 14, 15), and furthermore the piston has at least one limited pressure chamber (8, 9) formed in the cylinder (4), characterized in that the peripheral seals are designed as hybrid seals, each with a high pressure seal (13, 14) facing the respective pressure chamber (8, 9) and a low pressure seal arranged behind it ( 15).
    [2]
    2. Adjustable connecting rod according to claim 1, characterized in that the piston (5) has two high-pressure seals (13, 14) with an intermediate low-pressure seal (15).
    [3]
    3. Length-adjustable connecting rod according to claim 2, characterized in that a single common low-pressure seal (15) is arranged between the two high-pressure seals (13, 14).
    [4]
    4. Length-adjustable connecting rod according to one of claims 1 to 3, characterized in that the cylinder (4) in the one connecting rod section (2) has mechanical stops (6, 7) for the piston (5) of the other connecting rod section (3), so that one of the stops defines a large connecting rod length, while the other stop (7) defines a small connecting rod length.
    [5]
    5. Adjustable connecting rod according to one of claims 1 to 4, characterized in that the pressure chambers (8, 9) in the cylinder (4) via a check valve (10, 11) is connected to the oil supply to the internal combustion engine.
    [6]
    6. Adjustable connecting rod according to one of claims 1 to 5, characterized in that each pressure chamber (8, 9) is connected to a control valve (12) through which the pressure chamber can be opened or closed.
    类似技术:
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    同族专利:
    公开号 | 公开日
    AT519803A3|2019-03-15|
    DE102017107720A1|2018-10-11|
    AT519803B1|2019-10-15|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    AT514071B1|2013-10-18|2014-10-15|Avl List Gmbh|Length adjustable connecting rod|
    AT517217B1|2015-06-18|2016-12-15|Avl List Gmbh|LENGTH-ADJUSTABLE CONNECTING ROD|
    FR3043740B1|2015-11-17|2018-01-05|MCE 5 Development|ROD FOR MOTOR WITH VARIABLE VOLUMETRIC RATIO|DE102019120480A1|2018-12-04|2020-06-04|ECO Holding 1 GmbH|Connecting rod for an internal combustion engine with variable compression|
    DE102019101876A1|2019-01-25|2020-07-30|ECO Holding 1 GmbH|Connecting rod for an internal combustion engine with variable compression and method for producing a connecting rod|
    WO2021209283A1|2020-04-16|2021-10-21|VOIGT, Daniel|Longitudinally variable connecting rod for adjusting the compression of a reciprocating piston internal combustion engine|
    DE102020002316B3|2020-04-16|2021-04-29|Daniel Voigt|Internal combustion engine with adjustable connecting rod|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DE102017107720.0A|DE102017107720A1|2017-04-10|2017-04-10|Length adjustable connecting rod for a piston engine|
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