• 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 reciprocating piston engine with at least one first rod part (2) with a small connecting rod eye (3) and at least one second rod part (4) with a large connecting rod eye (5), which rod parts (2, 4 ) are telescopically zoomed in and / or into each other, wherein the second rod part (4) has a guide cylinder (8) and the first rod part (2) is fixedly connected to a longitudinally displaceable in the guide cylinder (8) piston element (7), wherein on a first side of the piston element (7) between the second rod part (4) and the piston element (7) a first high-pressure chamber (10) and on a second side of the piston element (7) a second high-pressure chamber (12) is clamped, and wherein at least for sealing a high pressure chamber (10, 12) at least one sealing element (22, 24) is provided. In order to enable a low-wear sealing between the two rod parts (2, 4) in the simplest possible, compact and reliable manner, it is provided that the piston element (7) in an interference fit region (30a) with the first rod part (2) via an interference fit ( 30) is non-positively connected.
    公开号:AT517619A4
    申请号:T50942/2015
    申请日:2015-11-05
    公开日:2017-03-15
    发明作者:Dipl Ing Melde-Tuczai Helmut；Ing Siegfried Hartwig Dipl
    申请人:Avl List Gmbh；
    IPC主号:
    专利说明:

    The invention relates to a length-adjustable connecting rod for a reciprocating engine, in particular internal combustion engine, with at least a first rod part with a small connecting rod and at least a second rod part with a large connecting rod, which two rod parts in the direction of a longitudinal axis of the connecting rod telescopically zoom and / are slidable wherein the second rod part has a guide cylinder and the first rod part is fixedly connected to a longitudinally displaceable in the guide cylinder piston member, wherein on a first side of the piston member between the second rod member and the piston member, a first high pressure chamber and spanned on a second side of the piston member, a second high pressure chamber wherein each high-pressure chamber is fluidly connected to at least one oil passage, and wherein at least one sealing element is provided for sealing at least one high-pressure chamber.
    The publication AT 514 071 Bl discloses an internal combustion engine with a length-adjustable connecting rod with a first and a second rod part, which rod parts are telescopically zu - and slidable. The second rod part in this case has a piston element designed as a stepped piston, which is guided in a guide cylinder formed by the first rod part. The piston element adjoins opposite end faces in each case to a high-pressure chamber, which is arranged between the first and the second rod part. For refilling and emptying of the high-pressure chamber with oil and thus for length adjustment of the connecting rod, a control valve is provided in the connecting rod. To seal the high-pressure chambers, a sealing element-for example an O-ring-is arranged between the piston element and the guide cylinder, and between the second rod part and a clamping sleeve firmly connected to the first rod part.
    In this case, however, it can come to an axial crushing and, consequently, a strong wear of the sealing elements due to the axial movement along the inner surfaces of the guide cylinder or the clamping sleeve.
    The object of the invention is to avoid the disadvantages mentioned and to enable as simple, compact and reliable manner a low-wear seal between the two rod parts.
    According to the invention this is achieved in that the piston element is non-positively connected in a press-fit region via an interference fit with the first rod part.
    The press-fit region of the piston element is preferably formed by an inner circumferential surface of an annular end region of the piston element facing the small connecting-rod eye and the press-fit region of the first rod part by an outer circumferential surface of a shoulder region of the first rod part facing away from the small connecting-rod eye. The inner diameter of the inner circumferential surface of the annular end region is - made smaller before the assembly - at least in the press-fit area than the outer diameter of the outer circumferential surface of the shoulder region. As a result of this interference fit, after assembly, there is a non-operationally releasable frictional connection between the piston element and the first rod part. Due to the interference fit can be on a radial shoulder over which the piston member and the first rod part - to support the second sealing element - against each other, be dispensed with. Such a radial shoulder would have the disadvantage that a relatively large amount of space in the radial direction would be necessary, which would significantly increase the size and weight of the connecting rod. In contrast, the solution according to the invention makes it possible to keep the size of the connecting rod and its weight as small as possible.
    In a variant of the invention, at least one second sealing element is then force-free between the first rod part and the piston element in the direction of the longitudinal axis for sealing the second high pressure space between the first rod part and the second rod part or a clamping sleeve firmly connected to the second rod part arranged. In order additionally to preclude an axial squeezing of the second sealing or sealing element, it is advantageous if the second sealing element has a defined clearance in the direction of the longitudinal axis relative to the piston element and / or the second rod part.
    In a preferred embodiment of the invention it is provided that the piston element has a first piston part and a second piston part, wherein the first piston part adjacent to the first high-pressure chamber and the second piston part to the second high-pressure chamber, wherein preferably the second piston part forms the press-fit region of the piston element.
    The interference fit is chosen so that the mass force of the second piston element can be transferred to the first rod part.
    An advantageous embodiment of the invention provides that the first piston part is screwed to the first rod part, wherein preferably the first piston part has a blind bore with an internal thread, which is screwed to an external thread of the first rod part. The adjacent to the first high-pressure chamber first piston part is thus designed similar to a cap nut and screwed onto the first rod part of a small connecting rod eye side facing away.
    Characterized in that the first piston part similar to a cap nut has a blind bore with an internal thread, internal leakage through the thread of the screw is avoided. Alternatively, in principle, a version with a conventional nut is possible - for this additional sealing elements are then provided due to the mentioned leakage. Conveniently, the first piston part and the second piston part are interconnected by annular contact surfaces in the direction of the longitudinal axis, which are preferably arranged normally on the longitudinal axis. It is particularly advantageous if at least one first sealing or sealing element in the direction of the longitudinal axis is force-free between the first piston part and the second piston part to seal the first high pressure space between the piston element and guide cylinder at least one contact surface. In this case, the first sealing element preferably has a defined clearance in the direction of the longitudinal axis relative to the first piston part and / or the second piston part. As a result, an axial crushing of the first sealing element is reliably avoided.
    During assembly, the second piston part is pushed with its interference fit region by tightening the first piston part on the first rod part over the interference fit region of the first rod part. By the biasing force of the through the internal thread of the first piston member and the external thread of the first
    Rod part formed screw while the resistance can be overcome by the interference fit with relatively little effort.
    The invention is explained in more detail below with reference to the non-limiting exemplary embodiment illustrated in the figures. In it show schematically
    1 shows a connecting rod according to the invention in a longitudinal section in a first switching position,
    Fig. 2, this connecting rod in a longitudinal section in a second first switching position and
    Fig. 3 shows an assembly step of this connecting rod in a longitudinal section.
    In FIGS. 1 and 2, only one half side of the connecting rod 1 is shown in each case.
    1 and 2 each show a two-part connecting rod 1 of a reciprocating engine, in particular an internal combustion engine with an upper first rod member 2 with the small connecting rod 3 for connection to a piston not shown and a lower second rod member 4 with a connecting rod bearing 5a forming large connecting rod 5 for connection to a crankshaft, not shown. The first rod part 2 is adjustable relative to the second rod part 4 between an extended position and an inserted position about a limited by an end stop 6 adjustment in the direction of the longitudinal axis la of the connecting rod 1. In the upper first rod part 2, a substantially cylindrical piston element 7 is attached.
    The first rod part 2 and the second rod part 4 of the connecting rod 1 are hydraulically coupled in the pressure direction and mechanically limited in the opposite direction by the end stop 6 in their movement. Pressure direction here means the direction in which the force of combustion in the piston chamber acts on the piston, not shown. As a hydraulic coupling is to understand that each time a setting of the connecting rod 1 each one elsewhere arranged hydraulic pad the first rod part 2 is supported against the second rod part 4.
    The piston element 7 designed as a stepped piston is guided displaceably axially (in the direction of the longitudinal axis la of the connecting rod 1) in a guide cylinder 8 of the lower second rod part 4 of the connecting rod 1, wherein a first end face 9 of the piston element 7 facing the large connecting rod eye 5 and the second Rod part 4 and the guide cylinder 8 in a shown in Fig. 2 shown extended position of the two rod parts 2, 4, a first high-pressure chamber 10 is clamped. Furthermore, a second high-pressure chamber 12 is clamped between a second end face 11 of the piston element 7 and the second rod part 4 facing the small connecting rod eye 3 in a collapsed position of the two rod parts 2, 4. In the illustrated embodiment, the second high-pressure chamber 12 is clamped between the second end face 11 and a clamping sleeve 33 as part of the second rod part 4.
    Under a stepped piston is generally understood a piston - in the present case a "double-acting piston" - with different sized effective surfaces, one of the active surfaces (here: oriented against the second high-pressure chamber 12 effective area) as an annular surface and the other effective surface formed as a circular area is. Due to the different effective surfaces, different pressure conditions can be realized.
    The annular first 9 and second end faces 11 form pressure application surfaces for an actuating medium, for example engine oil, which is conducted into the high-pressure chambers 10, 12 and is under pressure.
    The first high pressure chamber 10 and the second high pressure chamber 12 are connected via oil passages 15, 16 with a control valve, not shown, for example, designed as a simple switching valve, which selectively acts on the first 10 or second high-pressure chamber 12 with oil pressure. The pressurization of the high pressure spaces 10, 12 with oil is not part of the invention - it can for example be done in a similar manner as described in AT 514 071 Bl.
    The volume of the first high-pressure chamber 10 is limited by a clamping sleeve 33 screwed into the shaft part 4a of the second rod part 4, which defines the maximum possible stroke of the piston element 7. Depending on the length of this clamping sleeve 33, the adjustment range AL of the connecting rod length of the Lanaenverstellbaren Pleuelstanae 1 beliebia can be adjusted.
    As clearly shown in the figures, the piston element 7 consists of a first piston part 17 and a second piston part 27. The first piston part 17 adjoins the first high-pressure chamber 10, the second piston part 27 adjoins the second high-pressure chamber 12.
    The first piston part 17 is screwed to the first rod part 2 at its end facing away from the small connecting rod 3 end 2a. The first piston part 17 has a blind bore 18 with an internal thread 19 which is screwed to an external thread 20 of the first rod part 2. Internal thread 19 and external thread 20 thus form a screw 21 between the piston member 7 and the first rod part 2. The first piston member 17 is thus carried out similar to a cap nut and screwed onto the first rod part 2 of a small connecting rod 3 side facing away. By the cap nut similar design of the first piston member 17, an internal leakage over the thread of the screw 21 is avoided.
    The first piston part 17 and the second piston part 27 of the piston element 7 are connected to each other by annular contact surfaces 17a, 27a in the direction of the longitudinal axis la or in contact with each other, which contact surfaces 17a, 27a are arranged in the embodiment normal to the longitudinal axis la of the connecting rod 1 , Subsequent to the contact surface 27a of the second piston part 27, a first sealing element 22 is disposed between the first piston part 17 and the second piston part 27 without force in the direction of the longitudinal axis 1a. The axially force-free arrangement is achieved by a defined play in the direction of the longitudinal axis la of the first sealing element 22 relative to the first piston part 17 and / or the second piston part 27. As a result, crushing of the first sealing element 22 in the direction of the longitudinal axis can be ruled out, which would lead to increased wear of the first sealing element 22.
    The second piston part 27 of the piston element 7 is non-positively connected in its press-fit region 30a via an interference fit 30 with a corresponding press-fit region 30b of the first rod part 2. Subsequent to the press-fit regions 30a, 30b, a second sealing element 24 is arranged between the first rod part 2 and the second piston part 27 in a force-free manner in the direction of the longitudinal axis 1a.
    The press-fit region 30a of the piston element 7 is remote from the small connecting-rod eye 3 through an outer circumferential surface 27b of an annular end region 7a of the piston element 7 facing the small connecting rod eye 3 and the interference fit region 30b of the first rod part 2 through an outer circumferential surface 23a of the small connecting rod eye 3 formed portion of the first rod portion 2 subsequent paragraph portion 23 of the first rod part 2 formed. The inner diameter d of the inner circumferential surface 27b of the annular end portion 7a is smaller than the outer diameter D of the outer circumferential surface 23a of the shoulder portion 23 of the first rod part 2, at least in the press-fit area 30a of the piston element 7, before assembly. This interference fit 30 occurs after assembly to a - non-detachable - frictional connection between the piston member 7 and the first rod part 2. The solution according to the invention makes it possible to keep the size of the connecting rod 1 and its weight as small as possible. The interference fit 30 is selected so that the mass force of the second piston part 27 of the piston element 7 can be transmitted to the first rod part 2.
    3 shows the assembly of the piston element 7 on the first rod part 2. In this case, the second piston part 27 is pushed with its press-fit region 30a by screwing the first piston part 17 on the first rod part 2 over the press-fit region 30b of the first rod part 2. By the biasing force of the screw 21 can be overcome by the interference fit 30 caused resistance relatively easily.
    权利要求:
    Claims (10)
    [1]
    1. Length-adjustable connecting rod (1) for a reciprocating engine, in particular internal combustion engine, with at least a first rod part (2) with a small connecting rod eye (3) and at least a second rod part (4) with a large connecting rod eye (5), which two rod parts (2 , 4) in the direction of a longitudinal axis (la) of the connecting rod (1) are telescopically zu¬ and / or slidable, wherein the second rod part (4) has a guide cylinder (8) and the first rod part (2) fixed to one in the guide cylinder (8) longitudinally displaceable piston element (7) is connected, wherein on a first side of the piston element (7) between the second rod part (4) and the piston element (7) a first high-pressure chamber (10) and on a second side of the piston element (7) a second high pressure chamber (12) is clamped, wherein each high pressure chamber (10, 12) with at least one oil passage (15, 16) is fluidly connected, and wherein for sealing at least one high pressure chamber (10, 12) at least one sealing element (22, 24) is provided, characterized in that the piston element (7) in a press-fit region (30a) with the first rod part (2) via a interference fit (30) is non-positively connected.
    [2]
    Second connecting rod (1) according to claim 1, characterized in that the press-fit region (30 a) of the piston element (7) by an inner circumferential surface (27 b) of the small connecting rod eye (3) facing annular end portion (7 a) of the piston element (7) and the press seat region (30b) of the first rod part (2) is formed by an outer jacket surface (23a) of a shoulder region (23) of the first rod part (2) facing away from the small connecting rod eye (3).
    [3]
    3. Connecting rod (1) according to claim 1 or 2, characterized in that for sealing the second high-pressure chamber (12) between the first rod part (2) and the second rod part (4) or a fixed to the second rod part (4) connected to the clamping sleeve (33) at least one second sealing element (24) subsequent to the press-fit region (30a) of the piston element (7) in the direction of the longitudinal axis (la) force-free between the first rod member (2) and the piston member (7) is arranged, vorzuasweise the second Dichtunaselement (24) in Richtuna the Länasachse (la) a defined clearance relative to the piston member (7) and / or the second rod part (2).
    [4]
    4. Connecting rod (1) according to one of claims 1 to 3, characterized in that the piston element (7) has a first piston part (17) and a second piston part (27), wherein the first piston part (17) to the first high-pressure chamber ( 10) and the second piston part (27) adjoins the second high-pressure chamber (12).
    [5]
    5. Connecting rod (1) according to claim 4, characterized in that the second piston part (27) forms the press-fit region (30a) of the piston element (7).
    [6]
    6. Connecting rod (1) according to any one of claims 4 or 5, characterized in that the first piston part (17) with the first rod part (2) is screwed.
    [7]
    7. Connecting rod (1) according to one of claims 4 to 6, characterized in that the first piston part (17) has a blind bore (18) with an internal thread (19), which with an external thread (20) of the first rod part (2). is screwed.
    [8]
    8. Connecting rod (1) according to one of claims 4 to 7, characterized in that the first piston part (17) and the second piston part (27) by annular contact surfaces (17a, 27a) in the direction of the longitudinal axis (la) are interconnected, which are preferably arranged normal to the longitudinal axis (la).
    [9]
    9. connecting rod (1) according to claim 8, characterized in that for sealing the first high-pressure chamber (10) between the piston element (7) and guide cylinder (8) then at least one contact surface (17a, 27a) at least a first sealing element (22) in Direction of the longitudinal axis (la) without force between the first piston part (17) and the second piston part (27) is arranged.
    [10]
    10. connecting rod (1) according to one of claims 4 to 9, characterized in that a for sealing the first high-pressure chamber (10) between the piston element (7) and guide cylinder (8) arranged first sealing element (22) in the direction of the longitudinal axis (la) a defined clearance relative to the first piston part (17) and / or the second piston part (27). 2015 11 05 / Fu
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    同族专利:
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    EP3371470A1|2018-09-12|
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    CN108474408A|2018-08-31|
    JP2019501338A|2019-01-17|
    JP6875392B2|2021-05-26|
    KR20180078270A|2018-07-09|
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE102011108304A1|2011-07-21|2013-01-24|Festo Ag & Co. Kg|Drive unit of fluid-actuated working cylinder, has flat elements that are formed at outer periphery of the pole assembly and engaged with projecting stop element|
    AT514071A4|2013-10-18|2014-10-15|Avl List Gmbh|Length adjustable connecting rod|US10669930B2|2015-08-10|2020-06-02|Avl List Gmbh|Reciprocating piston machine comprising a length adjustable connecting rod and an inductively actuatable control valve|
    US10738690B2|2016-07-06|2020-08-11|Avl List Gmbh|Connecting rod having an adjustable connecting rod length with a mechanical actuating means|
    US10876474B2|2016-05-31|2020-12-29|Avl List Gmbh|Length-adjustable connecting rod, device for setting a compression ratio and internal combustion engine|
    US10954849B2|2015-12-14|2021-03-23|Avl List Gmbh|Length-adjustable connecting rod with electromagnetically-actuatable switching valve|
    US11066987B2|2017-02-24|2021-07-20|Avl List Gmbh|Method for operating a reciprocating piston machine having at least one piston rod that is hydraulically adjustable in length|CN101109321A|2007-08-08|2008-01-23|陈晨|Self-adaption compression ratio variable engine|
    AT506469B1|2009-03-26|2010-12-15|Avl List Gmbh|Internal combustion engine|
    AT513054B1|2012-07-03|2014-09-15|Avl List Gmbh|Length adjustable connecting rod|
    AT511803B1|2011-12-23|2013-03-15|Avl List Gmbh|CONNECTING ROD FOR A PUSH-PISTON MACHINE|AT521648B1|2018-09-05|2022-01-15|Avl List Gmbh|Support ring, sealing device, sealing arrangement and length-adjustable connecting rod for a reciprocating engine|
    AT521501B1|2018-12-03|2020-02-15|Avl List Gmbh|Length-adjustable connecting rod with press connection|
    AT521517B1|2019-01-30|2020-02-15|Avl List Gmbh|Length-adjustable connecting rod with pin connection|
    AT522985B1|2019-10-08|2021-07-15|Avl List Gmbh|Length-adjustable connecting rod with a sealing device|
    CN113494513A|2020-04-07|2021-10-12|广州汽车集团股份有限公司|Length-variable connecting rod device|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA50942/2015A|AT517619B1|2015-11-05|2015-11-05|LENGTH-ADJUSTABLE CONNECTING ROD|ATA50942/2015A| AT517619B1|2015-11-05|2015-11-05|LENGTH-ADJUSTABLE CONNECTING ROD|
    KR1020187014712A| KR20180078270A|2015-11-05|2016-11-07|Length-adjustable connecting rod|
    JP2018522736A| JP6875392B2|2015-11-05|2016-11-07|Adjustable length connecting rod|
    US15/771,283| US20180320731A1|2015-11-05|2016-11-07|Length-Adjustable Connecting Rod|
    EP16801688.9A| EP3371470B1|2015-11-05|2016-11-07|Length-adjustable connecting rod|
    PCT/AT2016/060103| WO2017075646A1|2015-11-05|2016-11-07|Length-adjustable connecting rod|
    CN201680064723.5A| CN108474408B|2015-11-05|2016-11-07|Length-adjustable connecting rod|
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