• 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 portion (2) associated with the crankshaft and a second connecting rod portion (4) associated with the engine piston, wherein a cylinder (3) is formed in a connecting rod portion, during the another connecting rod section is provided with a piston (5), which is arranged displaceably in the cylinder (3) and limits at least one hydraulic pressure chamber (10, 11) according to its position in the cylinder (3). Thus, the connecting rod (1) can take intermediate positions in addition to a short and a long rod length, the invention provides that the hydraulic pressure chambers (10, 11) via a drain valve (16) can be locked, so that the piston can assume a central position in which it limits two hydraulic pressure chambers (10, 11).
    公开号:AT519805A2
    申请号:T50304/2018
    申请日:2018-04-10
    公开日:2018-10-15
    发明作者:Kai Arens Dr
    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, having a first connecting rod section (2) assigned to the crankshaft and a second connecting rod section (4) assigned to the engine piston, a cylinder (3) being formed in a connecting rod section during the another connecting rod section is provided with a piston (5) which is arranged displaceably in the cylinder (3) and limits at least one hydraulic pressure chamber (10, 11) according to its position in the cylinder (3). In order that the connecting rod (1) can also take intermediate positions in addition to a short and a long connecting rod length, the invention provides that the hydraulic pressure chambers (10, 11) can be locked via a drain valve (16), so that the piston can assume a central position , in which it delimits two hydraulic pressure chambers (10, 11).
    Fig. 1/9
    PP31850AT
    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, having a first connecting rod section assigned to the crankshaft and a second connecting rod section assigned to the engine piston, a cylinder being formed in one connecting rod section, while the other connecting rod section is provided with a piston which is in the cylinder is arranged displaceably and limits at least one hydraulic pressure chamber according to its position in the cylinder.
    Such a length-adjustable connecting rod is known, for example, from WO2015 / 055582. In the connecting rod there, the piston can assume two positions, in which it moves against a mechanical stop and is hydraulically locked by the pressure chamber formed on the other side of the stop.
    This type of connecting rod length adjustment has the advantage that the mechanical stop clearly defines both positions, so that a clear compression ratio can be assigned to the two positions.
    However, not all compression ratios can be represented by two connecting rod lengths, so that it would be desirable to also implement intermediate positions.
    The invention is therefore based on the object of developing a length-adjustable connecting rod of the type mentioned at the outset such that the connecting rod can also assume intermediate positions between the short and long connecting rod lengths.
    This object is achieved according to the invention in that the hydraulic pressure chambers can be locked via a drain valve each, so that the piston can assume a central position in which it delimits two hydraulic pressure chambers.
    This solution provides that a mechanical stop is deliberately avoided for the middle position. At least for the intermediate positions, this gives up the advantage that a certain connecting rod length is determined by a mechanical and thus clearly defined stop. On the other hand, you gain the advantage that you can better adapt the connecting rod length and thus the compression ratio of the engine to the respective operating conditions. The two connecting rod sections are preferably telescoped. The use of a hydraulically adjustable eccentric, preferably in the small connecting rod eye, is also possible.
    / 9
    PP31850AT
    AVL List GmbH, iwis motorsysteme GmbH & Co. KG
    According to a preferred embodiment, each pressure chamber is connected to an inlet check valve which allows the hydraulic medium to flow in, but blocks the outflow. The combination with the controllable drain valves means that if the pressure chambers are blocked, no hydraulic medium can escape, but can flow in. In other words, this means that any leakage losses in the pressure chambers are compensated for.
    A development of the invention is particularly preferred, according to which the two pressure chambers are connected to a 3/3-way valve parallel to the inlet check valves, the 3/3-way valve
    in a first switching position blocks the outflow of one pressure chamber and allows the outflow of the other pressure chamber,
    - In a second switching position, the outflow of both pressure chambers is blocked and
    - In a third switching position blocks the outflow of the other pressure chamber and releases the outflow of the one pressure chamber.
    In this way, it is easily possible to set the length-adjustable connecting rod short and long, and to lock it in any middle position by locking both pressure chambers.
    According to a preferred embodiment, the hydraulic medium is engine oil, so that the length-adjustable connecting rod can be easily connected to the engine oil supply.
    It is also advantageous if the drain valves are designed as solenoid control valves. The connecting rod length can be set by simply actuating the solenoid valves while the engine is running.
    It is particularly advantageous here if the drain valves are designed to be controllable, a knock sensor being integrated in the control of the drain valves. This means that the engine can always be operated close to the knock limit.
    The setting of the connecting rod length adjustment can be regulated in a simple manner via the duration of the control of the drain valves.
    / 9
    PP31850AT
    AVL List GmbH, iwis motorsysteme GmbH & Co. KG
    This type of control of the drain valves advantageously also enables the connecting rod to be adjusted in length as a function of further engine characteristics, such as speed, load, consumption and speed.
    The invention is explained in more detail below on the basis of a single drawing.
    The drawing shows schematically a length-adjustable connecting rod 1 for a reciprocating piston engine. The connecting rod 1 comprises a first connecting rod section 2, which comprises a radially projecting cylinder 3, into which a second connecting rod section 4 with a piston 5 is telescopically inserted. The second connecting rod section 4 has a piston rod 6, which connects the piston 5 to the small connecting rod eye 7, which is assigned to the engine piston of the internal combustion engine. The cylinder 3 is provided with a cylinder cover 8, which also serves as an upper stop for the piston 5. The lower stop of the piston 5 is formed by the cylinder bottom 9. The piston 5 is shown in the drawing in an intermediate position in which the length-adjustable connecting rod 1 also occupies an intermediate position between the largest and the smallest length. In this position, the double-acting piston 5 divides the cylinder into two pressure chambers 10 and 11, which are filled with engine oil. Each of the pressure chambers 10, 11 is connected with an oil line 12 or 13 to the engine oil supply of the internal combustion engine. Check valves 14, 15 are located in the oil lines 12 and 13, which allow the inflow of oil into the pressure chambers 10 and 11, but block the outflow from these chambers. Parallel to the check valves 14 and 15, the oil lines 12 and 13 branch off to a 3/3-way valve, by means of which either the discharge of a pressure chamber 10 or 11 or both pressure chambers 10 and 11 can be blocked. In the position of the 3/3-way valve 16 shown in the drawing, the outlet of the upper pressure chamber 11 is open, while the outlet of the lower pressure chamber 10 is blocked. In this position of the 3/3-way valve, the inertial forces of the engine ensure that the piston 5 moves upwards in the direction of the stop formed by the cylinder cover 8. The gas pressure forces of the engine, which would actually ensure that the piston moves downward, are prevented by the blocked pressure chamber 10. The pressure chamber 10 continues to fill with engine oil when the piston moves upwards, but the oil cannot flow away. The length-adjustable connecting rod 1 thus occupies its longest length in this position of the 3/3-way valve.
    If the connecting rod length is to be shortened on the basis of determined engine data, which is the case, for example, if the engine tends to knock, the 3/3 directional valve is pushed completely to the left, so that the lower pressure chamber 10 and the engine oil located there are opened can drain while the drain of the upper pressure chamber 11 is blocked. On this / 9
    PP31850AT
    AVL List GmbH, iwis motorsysteme GmbH & Co. KG
    The piston can move downwards until the knock limit is undershot. If this happens before the lower stop is reached, the engine control can provide that the 3/3-way valve is moved into the middle position, in which both the upper pressure chamber 11 and the lower pressure chamber 10 are blocked. The length-adjustable connecting rod takes a middle position. This means that the engine can always be operated close to the knock limit.
    / 9
    PP31850AT
    AVL List GmbH, iwis motorsysteme GmbH & Co. KG
    LIST OF REFERENCE NUMBERS
    Connecting rod first connecting rod section
    Second connecting rod cylinder
    piston
    piston rod
    connecting rod
    cylinder cover
    cylinder base
    pressure chamber
    pressure chamber
    oil line
    oil line
    Inlet check valve
    Inlet check valve
    3/3-way valve / 9
    PP31850AT
    AVL List GmbH, iwis motorsysteme GmbH & Co. KG
    权利要求:
    Claims (9)
    [1]
    Expectations
    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 (4) assigned to the engine piston, a cylinder (3) being formed in a connecting rod section, while the other connecting rod section is designed with a Piston (5) is provided, which is arranged displaceably in the cylinder (3) and limits at least one hydraulic pressure chamber (10, 11) according to its position in the cylinder, characterized in that the hydraulic pressure chambers (10, 11) each have a Drain valve (16) can be locked so that the piston can assume a central position in which it delimits two hydraulic pressure chambers (10, 11).
    [2]
    2. Length-adjustable connecting rod according to claim 1, characterized in that each pressure chamber is connected to an inlet check valve (14, 15) which allows the inflow of the hydraulic medium, but blocks the outflow.
    [3]
    3. Length-adjustable connecting rod according to claim 2, characterized in that the pressure chambers (10, 11) parallel to the inlet check valves (14, 15) with a 3/3 way valve (16) are connected, the 3/3 way valve
    - In a first switching position, the outflow of one pressure chamber (10) is blocked and allows the outflow of the other pressure chamber (11),
    - In a second switching position, the outflow of both pressure chambers (10, 11) is blocked, and
    - In a third switching position, the outflow of the other pressure chamber (11) is blocked and the outflow of one pressure chamber (10) is released.
    [4]
    4. Adjustable connecting rod according to one of claims 1 to 3, characterized in that the hydraulic medium is engine oil.
    [5]
    5. Length-adjustable connecting rod according to one of claims 1 to 3, characterized in that the drain valves are designed as solenoid control valves (16).
    [6]
    6. Length-adjustable connecting rod according to one of claims 1 to 5, characterized in that the drain valves are designed to be controllable, a knock sensor being integrated in the control of the drain valves.
    [7]
    7/9
    PP31850AT
    AVL List GmbH, iwis motorsysteme GmbH & Co. KG
    7. Length-adjustable connecting rod according to one of claims 1 to 6, characterized in that the control of the length adjustment of the connecting rod (1) takes place over the duration of the control of the drain valves.
    [8]
    8. Length-adjustable connecting rod according to one of claims 1 to 7, characterized in that the control of the length adjustment of the connecting rod (1) takes place in dependence on further engine characteristics, such as speed, load, consumption and speed.
    8/9
    PP31850AT
    AVL List GmbH iwis motorsysteme GmbH & Co. KG

    [9]
    9.9
    类似技术:
    公开号 | 公开日 | 专利标题
    AT514071A4|2014-10-15|Length adjustable connecting rod
    DE102014004987A1|2015-10-08|VCR piston engine with VCR connecting rod
    EP3519686B1|2020-07-29|Length-adjustable connecting rod with control device
    DE2423243A1|1975-03-27|HYDRAULIC CONTROL VALVE
    AT518848B1|2018-10-15|Connecting rod with adjustable connecting rod length with mechanical actuation
    DE102016104560A1|2017-09-14|Hydraulic valve for a Schwenkmotorversteller a camshaft
    AT519803B1|2019-10-15|Length adjustable connecting rod for a piston engine
    AT519805B1|2020-02-15|Length-adjustable connecting rod for a piston engine
    EP2620657A2|2013-07-31|Valve assembly for a mobile work machine
    DE102016208209A1|2017-11-16|Hydraulic compression adjustment
    DE2147439A1|1973-04-05|HYDRAULIC CIRCUIT AND VALVE ARRANGEMENT
    EP1767811B1|2009-02-11|Shock absorber with a damping force depending on the amplitude
    DE19507086C2|1997-01-30|Water hydraulic control valve
    DE2511991C2|1984-06-28|Directional valve with electromagnetic actuation device
    EP3458739B1|2020-04-01|Vibration damper having stroke-dependent damping force
    DE2319344A1|1974-11-07|DOUBLE-ACTING TELESCOPIC CYLINDER PISTON DEVICE
    DE102017100943A1|2017-07-20|Switching valve for controlling a fluid flow
    DE102016120943A1|2018-05-03|Connecting rod with adjusting mechanism between connecting rod and piston rod
    DE2032107B2|1973-03-22|HYDRAULIC CONTROL VALVE DEVICE WITH LOCKABLE FLOATING POSITION
    DE102008009543B3|2009-07-02|Vibration damper, has slider opening forming valve with piston axially moved between front surface and limiting surface, where slider opening is provided in sliding sleeve axially moved to piston rod, and piston shifted relative to sleeve
    AT519802A2|2018-10-15|Valve mechanism for a length-adjustable connecting rod
    DE102016120948A1|2018-05-03|Connecting rod with adjustment mechanism between connecting rod and connecting rod
    DE102010034095A1|2011-04-07|Hydraulic arrangement with a double-acting hydraulic device
    DE102010031037B4|2012-01-19|Vibration damper with frequency-selective damping force
    DE2141721C3|1978-06-08|Flow control valve
    同族专利:
    公开号 | 公开日
    CN110582625A|2019-12-17|
    AT519805B1|2020-02-15|
    WO2018188793A1|2018-10-18|
    DE102017107731A1|2018-10-11|
    CN110582625B|2021-10-29|
    AT519805A3|2019-02-15|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    GB2161580B|1984-07-07|1987-08-12|Peter Robert Davis|Variable length connecting rod|
    US5255637A|1992-04-30|1993-10-26|Ford Motor Company|Internal combustion engine with adaptive control of compression ratio|
    DE102012020999A1|2012-07-30|2014-01-30|Fev Gmbh|Hydraulic freewheel for variable engine parts|
    WO2014162043A1|2013-04-03|2014-10-09|Wärtsilä Finland Oy|Arrangement for setting a compression ratio of an internal combustion piston engine|
    DE102013107127A1|2013-07-05|2015-01-08|Hilite Germany Gmbh|Connecting rod for a two-stage variable compression|
    AT514071B1|2013-10-18|2014-10-15|Avl List Gmbh|Length adjustable connecting rod|
    AT515419B1|2014-05-12|2015-09-15|Imt C Innovative Motorfahrzeuge Und Technologie Cooperation Gmbh|Connecting rod for an internal combustion engine|
    DE102015203387A1|2015-02-25|2016-08-25|Fev Gmbh|Double-acting piston of a VCR engine|
    AT517109B1|2015-06-18|2016-11-15|Avl List Gmbh|LENGTH-ADJUSTABLE CONNECTING ROD|
    EP3390794B1|2015-12-14|2019-06-26|AVL List GmbH|Length-adjustable connecting rod with electromagnetically-actuatable switching valve|
    WO2017102108A1|2015-12-14|2017-06-22|Avl List Gmbh|Length-adjustable connecting rod with electromagnetically-actuatable switching valve|
    CN108138650B|2015-08-10|2021-02-09|Avl 里斯脱有限公司|Piston engine, in particular internal combustion engine|
    DE102016215282A1|2015-08-14|2017-02-16|Avl List Gmbh|Length adjustable connecting rod|
    CN205477932U|2016-03-16|2016-08-17|吉林大学|Hydraulic drive formula variable compression ratio piston link assembly|AT522793B1|2019-10-08|2021-02-15|Avl List Gmbh|Compact hydraulic valve mechanism for a length-adjustable connecting rod|
    AT522570B1|2019-10-08|2020-12-15|Avl List Gmbh|Hydraulic valve mechanism with throttle bore|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DE102017107731.6A|DE102017107731A1|2017-04-10|2017-04-10|Length adjustable connecting rod for a piston engine|
    [返回顶部]