• 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 engine, in particular for an internal combustion engine, with at least one first rod part (2) and a second rod part (3), which two rod parts (2, 3) telescopically and / or slidable into one another are, wherein the first rod part (2) has a guide cylinder (5) and the second rod part (3) at least one in the guide cylinder (5) longitudinally displaceable piston member (6), wherein in the region of a first side (6a) of the piston member (6) first pressure chamber (7) and in the region of a second side (6b) of the piston element (6) a second pressure chamber (8) is arranged, and wherein in the first pressure chamber (7) at least a first oil passage (9) and in the second pressure chamber ( 8) at least a second oil passage (10) opens. In order to allow a good seal and high wear resistance, it is provided that the first pressure chamber (7) is at least partially formed by a first bellows (11) and the second pressure chamber (8) is at least partially formed by a second bellows (12), wherein the first bellows (11) and the second bellows (12) are respectively connected to the first rod part (2) and the piston element (6).
    公开号:AT516387A4
    申请号:T50257/2015
    申请日:2015-03-31
    公开日:2016-05-15
    发明作者:Helmut Dipl Ing Melde-Tuczai；Wolfgang Dr Reik；Abdelkarim Redouane；Hubert Huemer
    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 for an internal combustion engine, with at least a first rod part and a second rod part, which two rod parts telescopically zoom in and / or into each other, wherein the first rod part a guide cylinder and the second rod part a in Guide cylinder longitudinally displaceable piston member, wherein in the region of a first side of the piston member, a first pressure chamber and in the region of a second side of the piston member, a second pressure chamber is arranged, and wherein at least a first oil passage and in the second pressure chamber at least a second oil passage opens into the first pressure chamber ,
    By changing the compression of an internal combustion engine can be driven full load with a lower compression ratio, and part load and starting with increased ratio. In the partial load range, the consumption is improved, the compression pressure is increased with the increased compression ratio at the start, and the peak pressure is reduced with a reduced ratio at high power and knocking is prevented.
    From AT 514 071 Bl a length-adjustable connecting rod with telescopically displaceable rod parts is known, wherein a rod part forms a guide cylinder and the other rod part forms a piston element. The piston element is adjacent to a first pressure area with a first pressure surface and to a second pressure space with a second pressure area facing away from the first pressure area. By pressurizing the first pressure chamber or the second pressure chamber, the length of the connecting rod can be increased or decreased.
    The publication US 2,217,721 A 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. Between the two rod parts a high-pressure chamber is spanned, into which an oil channel opens.
    WO 2013/092 364 A1 describes a length-adjustable connecting rod for an internal combustion engine with a first and a second rod part. The two rod parts are telescopically zoomed in and / or into each other, wherein the second rod part forms a guide cylinder and the first rod part forms a longitudinally displaceable in the guide cylinder piston member. Between the first and second rod part, a first high-pressure chamber is spanned, into which at least one first oil channel opens.
    Other connecting rods, each with a hydraulic telescopic mechanism for adjusting the connecting rod length are from the documents FR 2 857 408 Al, WO 02/10568 Al, DE 198 35 146 Al, US 4,195,601 A, US 4,124,002 A and US 2,134,995 A known.
    For sealing between the piston element and guide cylinder or between the first and second rod part usually O-rings or rectangular rings are used. However, these are exposed to high thermal and mechanical stress, which greatly reduces their life and the service life of the connecting rods.
    The object of the invention is to enable a good seal and high wear resistance of length-adjustable connecting rods.
    According to the invention this is achieved in that the first pressure chamber is at least partially formed by a first bellows and the second pressure chamber at least partially by a second bellows, wherein the first bellows and the second bellows are each preferably liquid-tightly connected to the first rod member and the piston member.
    The term "bellows" Herein denotes a hollow cylindrical or hose-like or tubular element made of any material, which in a longitudinal plane shows a shortened cross section over, for example, convolutions and can be extended and shortened in the axial direction. The bellows has a first and a second opposite end to the first. In a plane normal to said longitudinal plane of the bellows has, for example, a round or polygonal cross-section.
    In other words, the first and the second bellows are each connected at one end to the first rod part and in each case at the opposite end to the piston element. Conveniently, the first and the second
    Bellows each liquid-tightly connected to the first rod member and the piston member.
    Thanks to the invention, moving seals used according to the prior art can be dispensed with and replaced by significantly denser bellows seals. This increases the longevity and tightness of the system.
    It is advantageous if an inner circumferential surface of the first bellows facing away from the guide cylinder forms an outer wall of the first pressure chamber and an outer lateral surface of the second bellows facing the guide cylinder forms an inner wall of the second pressure chamber. In other words, one of the guide cylinder wall-that is, the guide cylinder limiting, substantially parallel to the connecting rod axis inner wall of the first rod member -facing side of the first bellows an outer wall of the first pressure chamber and the first pressure chamber is formed by the interior of the first bellows.
    An outer circumferential surface of the second bellows facing the guide cylinder wall forms an inner wall of the second pressure chamber, so that the second pressure chamber is formed between the guide cylinder wall and the outer lateral surface of the second bellows.
    The pressure oil can be introduced into the first pressure chamber from an end face of the guide cylinder facing the large connecting rod eye. The second pressure chamber, the oil can be supplied directly through the lateral surface of the guide cylinder.
    Each bellows assumes the function of a sealing device between the first and the second rod part. Sealing elements between relatively movable parts of the connecting rod can thus be omitted.
    At least one bellows may be formed by a corrugated tube, for example made of stainless steel. The corrugated tube allows on the one hand axial length changes due to the pressure oil supplied to the respective pressure chamber and on the other hand seals in the radial direction the pressure chamber with respect to the first rod part and the second rod part.
    Preferably, at least one bellows, for example, the first bellows, at least one end of an annular flange, wherein preferably the annular flange is sealed via at least one sealing device against a mating surface of the first rod member and the piston member. The mating surface may be formed, for example, by an end face of the guide cylinder. About the annular flange of the bellows relative to the first rod member or on the piston member can be supported. The sealing devices seal the bellows against the first rod part or against the piston element. These are only slightly loaded, purely static seals between relatively immovable parts. The annular flange is liquid-tight and firmly connected to the bellows and may preferably be welded to the bellows. Ring flange and bellows can be prefabricated as a unit and pushed together in the guide cylinder during assembly. The connection between bellows and annular flange is preferably provided on at least one end of the bellows.
    In a variant of the invention, the piston element is firmly connected to at least one bellows, preferably welded. In a further variant, the piston element is sealed off via at least one sealing device against a counter surface of the other bellows.
    Each bellows has - with respect to the first rod part - an immovable end and a movable end, wherein the immovable ends are immovably mounted on the first rod part and the movable ends are displaceable together with the piston member in the guide cylinder. In a variant of the invention, at least one bellows is supported with its movable end on the piston element or is firmly connected to the piston element, preferably welded. At least one of the bellows may be welded to the piston element at a movable end. In a further variant, at least one bellows, preferably the second bellows, is clamped at its immovable end to the first rod part. Advantageously, at least one bellows with its immovable end immovably and / or non-rotatably connected to the first rod part.
    In a further embodiment of the invention it is provided that at least one bellows is double-walled, wherein between the inner bellows and an outer bellows a respective pressure chamber forming cavity is arranged. In double-walled design, therefore, the bellows has an inner bellows and an outer bellows, which are arranged substantially concentrically. The pressure oil is introduced via the oil passages directly into the cavity between the inner bellows and the outer bellows.
    A buckling of the bellows outward under load or movement in the axial direction is substantially prevented by the guide cylinder surrounding the bellows. In order to prevent buckling of the bellows also to the inside, it can be provided within the scope of the invention that at least one lateral guide is arranged within at least one bellows. Lateral guide device here means that a movement of the bellows walls in the direction of the bellows interior, that is in a direction normal to the longitudinal axis of the bellows, is prevented by the guide device.
    The invention is explained in more detail below with reference to the non-limiting figures. Show it
    Fig. 1 is a connecting rod according to the invention in a longitudinal section in a first embodiment and
    Fig. 2 shows a connecting rod according to the invention in a longitudinal section in a second embodiment.
    Functionally identical parts are provided in the embodiments with the same reference numerals.
    Each of the figures shows a connecting rod 1 which is length-adjustable along the connecting rod axis 1a for an internal combustion engine, wherein the connecting rod 1 comprises a first rod part 2 with a large connecting rod eye not shown for receiving a connecting rod bearing for rotatable connection to a crankshaft and a second rod part 3 with a small connecting rod eye 4 for receiving a piston pin bearing not shown for pivotal connection with a piston. In the figures, in the left half of the second rod portion 3 is shown in a corresponding to the short length of the connecting rod 1 corresponding first position and in the right half in one of the long length of the connecting rod 1 corresponding second position.
    First rod part 2 and second rod part 3 are telescopically displaceable relative to each other. The relative displacement takes place in a direction along the connecting rod la. In the area of a first side 6a of the piston element 6, a first pressure chamber 7 and in the region of a second side 6b of the piston element 6 facing away from the first side 6a are formed second pressure chamber 8 is arranged. The first side 6a of the piston element 6 is oriented substantially in the direction of the large connecting rod eye not shown. The second side 6b is oriented substantially in the direction of the small connecting rod 4. The piston element 6 can be formed by the second rod part 3, ie integrally therewith, or - as shown in the figures, by a separate part fixedly connected to the second rod part 3.
    In each pressure chamber 7, 8 opens at least one oil passage 9, 10, whereby the first and the second pressure chamber 7, 8 can be applied in a known manner alternatively with pressure. The control of the pressurization is not the subject of the application.
    The first pressure chamber 7 is at least partially formed by a first bellows 11 and the second pressure chamber 8 at least partially by a second bellows 12. In particular, in FIG. 1, an inner circumferential surface 13 of the first bellows 11 facing away from the guide cylinder 5, ie the guide cylinder wall extending parallel to the connecting rod axis la, forms an outer wall 7a of the first pressure chamber 7. The first pressure chamber 7 is thus arranged in the interior of the first bellows 11 ,
    Furthermore, in both figures, a guide cylinder 5 - in particular the parallel to the connecting rod la extending guide cylinder wall - facing outer surface 14 of the second bellows 12 an inner wall 8a of the second pressure chamber 8. The second pressure chamber 8 is thus between guide cylinder wall and outer lateral surface 14 of the second Bellows 12 formed.
    The bellows 11, 12 are made of stainless steel, for example. This allows a change in length of the bellows 11, 12 under the action of an axial force.
    Each bellows 11, 12 has - with respect to the first rod part 2 - a stationary end 11a, 12a and a movable end 11b, 12b. The immovable ends 11a, 12a are immovably and / or non-rotatably fixedly connected to the first rod part 2. The movable ends 11b, 12b are displaceable together with the piston element 6 in the guide cylinder 5. In this case, the movable ends 11b, 12b can be supported axially on the piston element 6 or fixed, for example by welding, to be connected to the piston element 6.
    In the embodiment shown in Fig. 1, first and second bellows 11, 12 are formed by simple corrugated tubes made of stainless steel. The corrugated pipes are as thin-walled as possible in order to achieve high resistance with high elastic deformability. The immovable end 11 a of the first bellows 11 is fixedly connected to a first annular flange 15, which is fastened by means of a first screw 16 on the first rod part 2. The connection takes place at the bottom, the large connecting rod eye (not shown) facing the end of the guide cylinder 5, or at the oriented in the direction of the large connecting rod end face of the guide cylinder 5.The connection between the annular flange 15 and the first bellows 11 may for example be a welded joint , Between the first rod part 2 (or the large connecting rod eye not shown) facing side of the annular flange 15 and the first rod part 2, a static first sealing means 17 is arranged. The first annular flange 15 has at least one oil hole 15 a for the flow connection of the first oil channel 9 with the first pressure chamber 7. The first pressure chamber 7 is spanned in Fig.l by the inner circumferential surface 13 of the bellows 11, the piston member 6 and its first side 6a) and the first annular flange 15. The movable end 11 b of the first bellows 11 is fixedly connected to the piston member 6, for example, welded.
    The second bellows 12 has at its immovable end 12a an annular fold-like thickening 18, which is clamped between the first rod part 2 and a fastening sleeve 19. For this purpose, the fold-like thickening 18 is conically extending, in the direction of the small connecting rod 4 thinner becoming executed. The fastening sleeve 19 is a clamping screw 20 (which is hollow and through which the second rod part 3 is carried out) against the second bellows 12 and its falzartige
    Thickening 18 is pressed and prevents axial displacement of the immovable end 12 a of the second bellows 12. The movable end 12 b of the second bellows 12 is clamped between the second rod part 3 and a spacer sleeve 21 which is fastened by a screw 22 on the first rod part 2. Reference numeral 23 designates another static sealing device between the piston element 6 and the movable end 12a of the second bellows.
    The embodiment shown in Fig. 2 differs from Fig. 1 in that the first bellows 11 is double-walled, wherein between the inner bellows 25 (see FIG. 2) and an outer bellows 24 a first pressure chamber 7 forming cavity 26 is arranged is. The cavity 26 is connected via an opening 28 in the region of the fixed end 11 a of the first bellows 11 with a bore 15 a flow-connected to the first oil channel 9 in the first annular flange 15. The fixed end 11 a of the first bellows 11 is fixedly connected to the first annular flange 15, for example, welded. The first annular flange 15 is sealed off from the first rod part 2 by means of a static first sealing device 17.
    In the embodiment shown in FIG. 2, the first bellows 11 also has a second annular flange 27 in the region of the movable end 11b. The second annular flange is connected to the outer bellows 24 and the inner bellows 25 of the first bellows 11 in a fluid-tight and pressure-tight manner, for example by means of a welded connection. The piston element 6 bears against the second annular flange 27 on the side facing away from the first bellows 11 or the large connecting rod eye, wherein a second sealing device 28 is arranged between the second annular flange 27 and the piston element 6. In order to prevent buckling of the bellows 11, 12 in particular in the middle or radially in the direction of the connecting rod la, at least one lateral guide device 32, 33, 34, 35 can be arranged within the first bellows 11 and / or within the second bellows 12 , The guide device 32 is designed as a separate guide sleeve. Furthermore, cylindrical projections of the first annular flange 15 or of the piston element 6 can also form lateral guide devices, in particular for the first bellows 11, as indicated by reference numerals 33 and 34. A cylindrical region of the second rod part 3 adjoining the piston element 6 can also form a guide device 35 for the second bellows 12.
    On the side facing away from the first bellows 11 side of the piston member 6, the flange-like thickened movable end 12b of the second bellows 12 is liquid-and pressure-tight, for example, by a welded connection to the piston member 6. As in the first embodiment, the second pressure chamber 8 is formed by the outside of the second bellows 12, the guide cylinder 5 (in particular the guide cylinder wall) and the piston member 6 (in particular its second side 6b).
    In the second pressure chamber 8, the second oil passage 10 opens. The immovable end 12 a of the bellows 12 has a fold-like, annular thickening 18, which is received by an annular groove 29 in the guide cylinder 5 of the first rod part 2. By means of the clamping screw 20 and the mounting sleeve 19, the thickening 18 is fixed in the annular groove 29. Reference numeral 30 denotes a stop for limiting the axial stroke movement of the second rod part 3, which stop 30 cooperates with a slot 31 in the first rod part 2. The stop 30, which is formed, for example, by a screw screwed into the first rod part 2, can simultaneously also form an anti-twist device for the fastening sleeve 19.
    During assembly, the bellows 11, 12 are resiliently biased by the clamping screw 20, so that the piston member 6 is clamped between the bellows 11, 12 and the sealing means 17, 28, 23 of the annular flanges 15, 27 and the piston member 6 against the respective mating surfaces 17a , 28a, 23a of the first rod part 2, the piston element 6 and the second bellows 12 are pressed. The mating surfaces 17a, 28a, 23a are those surfaces of the first rod part 2, the piston member 6 and the second bellows 12, to which the sealing means 17, 28, 23 sealingly abut.
    Between the sealing means 17, 28, 23 and the corresponding mating surfaces 17a, 28a, 23a, no relative movements, in particular no shearing movements take place, thus there is no life-reducing increased stress on the sealing means 17, 28, 23. By alternative pressurization of the first Pressure chamber 7 or the second pressure chamber 8, the piston member 6 and thus the second rod part 3 in
    Direction of the connecting rod axis la shifted, with first and second bellows 11, 12 are alternately stretched and compressed.
    权利要求:
    Claims (14)
    [1]
    1. Length-adjustable connecting rod (1) for a reciprocating piston engine, in particular for an internal combustion engine, with at least a first rod part (2) and a second rod part (3), which two rod parts (2, 3) telescopically zu¬ and / or are slidable , wherein the first rod part (2) has a guide cylinder (5) and the second rod part (3) at least one piston element (6) longitudinally displaceable in the guide cylinder (5), wherein in the region of a first side (6a) of the piston element (6) a first Pressure chamber (7) and in the region of a second side (6b) of the piston member (6) a second pressure chamber (8) is arranged, and wherein in the first pressure chamber (7) at least a first oil passage (9) and in the second pressure chamber (8 ) at least a second oil passage (10) opens, characterized in that the first pressure chamber (7) is at least partially formed by a first bellows (11) and the second pressure chamber (8) at least partially through a second bellows (12) is formed, wherein the first bellows (11) and the second bellows (12) are each preferably liquid-tightly connected to the first rod part (2) and the piston element (6).
    [2]
    Second connecting rod (1) according to claim 1, characterized in that the guide cylinder (5) facing away from the inner circumferential surface (13) of the first bellows (11) forms an outer wall (7a) of the first pressure chamber (7).
    [3]
    3. connecting rod according to claim 1 or 2, characterized in that the guide cylinder (5) facing outer surface (14) of the second bellows (12) forms an inner wall (8a) of the second pressure chamber (8).
    [4]
    4. connecting rod (1) according to one of claims 1 to 3, characterized in that at least one bellows (112, 12) by a corrugated tube, preferably made of steel, is formed.
    [5]
    5. Connecting rod (1) according to one of claims 1 to 4, characterized in that at least one bellows (11, 12) at at least one end (11 a, 11 b) has an annular flange (15, 27), wherein preferably the annular flange (15 , 27) is sealed off by at least one sealing device (17, 28) from a mating surface (17a, 28a) of the first rod part (2) or the piston element (6).
    [6]
    6. connecting rod according to claim 5, characterized in that the annular flange (15, 27) with the bellows (11) liquid-tight and firmly connected, preferably welded, is.
    [7]
    7. connecting rod (1) according to one of claims 1 to 6, characterized in that the piston element (6) with at least one of the bellows (11, 12, 12, 11) fixedly connected, preferably welded.
    [8]
    8. connecting rod according to claim 5, characterized in that the piston element (6) via at least one sealing means (23) against a counter surface (23a) of the other bellows (12, 11, 11, 12) is sealed.
    [9]
    A connecting rod (1) according to any one of claims 1 to 7, characterized in that each bellows (11, 12) - with respect to the first rod part (2) - an immovable end (11a, 12a) and a movable end (11b , 12b), wherein the immovable ends (11a, 12a) are mounted on the first rod part (2) and movable ends (11b, 12b) together with the piston element (6) in the guide cylinder (5) are displaceable.
    [10]
    10. Connecting rod (1) according to claim 9, characterized in that at least one bellows (11, 12) with its movable end (11 b, 12 b) on the piston element (6) is supported or fixedly connected to the piston element (6), preferably welded , is.
    [11]
    11. Connecting rod (1) according to claim 9 or 10, characterized in that at least one bellows (11, 12) is clamped at its immovable end (11a, 12a) on the first rod part (2).
    [12]
    12. connecting rod (1) according to one of claims 9 to 11, characterized in that at least one bellows (11, 12) with its immovable end (11 a, 12 a) immovably and / or non-rotatably connected to the first rod part (2).
    [13]
    13. connecting rod (1) according to one of claims 1 to 12, characterized in that at least one bellows (11, 12) is double-walled, wherein between an inner bellows (24) and an outer bellows (25) a the respective pressure chamber ( 7, 8) forming cavity (26) is arranged.
    [14]
    14. connecting rod (1) according to one of claims 1 to 13, characterized in that within at least one bellows (11, 12) at least one lateral guide device (32, 33, 34, 35) is arranged. 2015 03 31 Fu
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    同族专利:
    公开号 | 公开日
    AT516387B1|2016-05-15|
    WO2016154652A1|2016-10-06|
    DE112016001461A5|2017-12-14|
    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|DE102017110363A1|2017-05-12|2018-11-15|Avl List Gmbh|Longer adjustable connecting rod with two telescopic connecting rod sections|
    AT519799A3|2017-04-10|2019-02-15|Avl List Gmbh|Length-adjustable connecting rod with a cylinder-piston unit with anti-rotation|
    US11199130B2|2016-05-31|2021-12-14|Avl List Gmbh|Length-adjustable piston rod with a control device that can be hydraulically actuated and a switching valve that can be electromagnetically actuated, a reciprocating piston engine and a vehicle|US1506540A|1923-07-27|1924-08-26|Matson Taylor|Compensating connecting rod for internal-combustion engines|
    MD559C2|1994-07-07|1997-01-31|Василе СИБОВ|Connecting rod of variable length|
    DE19530191A1|1995-08-17|1997-02-20|Daimler Benz Ag|connecting rod|
    FR2889864B1|2005-08-19|2008-11-28|Peugeot Citroen Automobiles Sa|ROD FOR MOTOR VEHICLE AUTOMOTIVE.|US20200217246A1|2016-09-30|2020-07-09|Avl List Gmbh|Length-adjustable connecting rod having stop surfaces|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA50257/2015A|AT516387B1|2015-03-31|2015-03-31|LENGTH-ADJUSTABLE CONNECTING ROD|ATA50257/2015A| AT516387B1|2015-03-31|2015-03-31|LENGTH-ADJUSTABLE CONNECTING ROD|
    DE112016001461.9T| DE112016001461A5|2015-03-31|2016-03-30|Length adjustable connecting rod|
    PCT/AT2016/050082| WO2016154652A1|2015-03-31|2016-03-30|Longitudinally adjustable connecting rod|
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