• 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 a first rod part (2) and a second rod part (4), which two rod parts (2, 4) relative to each other via at least a first helical gear in Direction of the longitudinal axis (1a) of the connecting rod (1) are displaceable, wherein the first helical gear (6) has two mutually threaded threaded parts (7, 8), of which a first threaded part (7) by a first nut (9) or ., First spindle (10) and a second threaded part (8) by a first spindle (10) and first nut (9) is formed. In order to enable a change in the compression ratio in the simplest possible way, it is provided that the first helical gear (6) is mechanically actuated via a second helical gear (16), wherein the second helical gear (16) has two gear parts (17, 18) meshing with one another ), of which a first gear part (17) by a second nut (19) or second spindle (10) and a second gear part (8) by a second spindle (10) and second nut (9) is formed.
    公开号:AT517718A4
    申请号:T50724/2015
    申请日:2015-08-14
    公开日:2017-04-15
    发明作者:Dipl Ing Melde-Tuczai Helmut；Andreas Huemer Hubert；Redouane Abdelkarim；Ing Bernhard Hödl 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 for an internal combustion engine, with at least a first rod part and a second rod part, which two rod parts are displaceable via a first helical gear in the direction of the longitudinal axis of the connecting rod, wherein the first helical gear at least a first thread part and a part Having the first gear part engaged second threaded part, wherein the first threaded part is formed by a first spindle or a first nut and the second threaded part by a first nut or first spindle.
    From the documents WO 06/115898 A1, US Pat. No. 5,406,911 A, GB 441 666 A it is known to adjust the length of connecting rods mechanically by means of a helical gear. In each case, the piston is rotated via its toothed piston skirt or via a thread in the region of the piston skirt.
    Furthermore, it is known from DE 42 26 361 Al an internal combustion engine with adjustable compression, in which the end position of the piston is variable. The change of the piston is achieved by an adjustable crankshaft bearing or by an adjustable Hubzapfenlager, wherein the adjustment is effected by an eccentric having at least one radially projecting piston which is hydraulically displaceable in a radial extension of the eccentric disc bearing.
    The object of the invention is to allow the simplest possible way a change in the compression ratio in a reciprocating engine.
    According to the invention this is achieved in that the first helical gear via a second helical gear is mechanically actuated, wherein the second helical gear has two meshing gear parts, of which a first gear part by a second nut or second spindle and a second gear part by a second Spindle and second nut is formed.
    In this context, a helical gear is understood to mean a gear which changes a movement of a displaceable component along a lifting axis into a rotary movement of a rotatable component about an axis of rotation or a rotational movement of a rotatable component into a translatory movement of a rotatable component is, with each other corresponding effective surfaces of the two coaxial components slide along each other. The active surfaces are removed from the common rotation or lifting axis, on the one hand in the region of the outer circumference of one - for example displaceable - component, and on the other hand in the region of the inner circumference of the other - for example rotatable - component arranged. The corresponding active surfaces can be formed by threads or by helical toothing of the components. Thus, it is provided in the context of the present invention that the first and / or second spindle an external thread or an external helical toothing and the corresponding first and second gear part nut has an internal thread or an internal helical toothing.
    The terms threaded parts, nut, spindle are thus not to be understood as limiting screw-shaped thread forms, but of course include embodiments in which the thread forms are formed by helical gears.
    The two helical gears are - with respect to the mechanical effective direction -serially arranged successively and coaxially with the longitudinal axis of the connecting rod in the connecting rod. The rotational movement of the second helical gear can be transmitted directly to the rotational movement of the first helical gear when a first threaded portion of the first helical gear is rotatably connected to a second gear part of the second helical gear or designed in one piece with this. Preferably, the non-rotatably connected to the second gear part of the second helical gear or integral with this first threaded portion of the first helical gear is rotatably mounted and non-displaceable in the direction of the longitudinal axis of the connecting rod in the first rod part. Similarly, the rotatably connected to the first threaded portion of the first helical gear second gear part of the second helical gear is rotatably mounted and immovably in the direction of the longitudinal axis of the connecting rod in the first rod part.
    Components and space can be saved according to an advantageous embodiment of the invention, when the second helical gear second threaded part of the first helical gear fixedly connected to the second rod part or is integral with this, preferably wherein the relative rotational position of the rod parts fixed to each other by at least one anti-rotation device has.
    A preferred embodiment of the invention provides that the first gear part of the second helical gear facing away from the first helical gear slidably mounted in the first rod part in the direction of the connecting rod and rotationally fixed. Thus, a stroke movement can be initiated in the first transmission part, which is converted in cooperation of the first gear part and the second gear part in a rotary motion. A defined rest position of the first gear part is defined by the first gear part can be brought by at least one first spring in a defined stroke position. A middle position or intermediate position as rest position can be defined when one of the first spring counteracting second spring acts on the first gear part.
    In order to keep the inertia forces acting on the first gear part as small as possible, it is advantageous if these consist of light metal. Conveniently, the first gear part has a piston or is designed as a piston, which faces away from the first helical gear end face to a pressure chamber, in which at least one pressure oil line opens, preferably in the pressure oil line, a temperature-sensitive flow control element is arranged.
    The first gear part assumes the rest position as soon as the pressure chamber is depressurized. The rest position of the first gear part is an end position of the rod parts relative to each other - for example, a maximum connecting rod length - assigned. If the pressure chamber is acted upon by oil pressure, the piston of the first transmission part is lifted. The lifting movement of the first gear part is converted into a rotational movement on the axially non-displaceably mounted second gear part. The rotational movement is transmitted to the first threaded portion of the first helical gear. The active surfaces of the internal thread of the first threaded part slide along the active surfaces of the external thread of the second threaded part and thus converts the rotational movement into a lifting movement which acts directly on the second rod part, for example in the direction of shortening the connecting rod.
    The invention is explained in more detail below with reference to the non-limiting figures.
    Show in it
    1 shows a connecting rod according to the invention in a longitudinal section in a first embodiment,
    2 shows a connecting rod according to the invention in a longitudinal section in a second embodiment,
    1 shows a connecting rod according to the invention in a section along the line III-III in FIG. 4 in a variant of the second embodiment,
    4 this connecting rod in a front view,
    5 shows this connecting rod in a side view,
    6 shows this new connecting rod in a section along the line VI - VI in Fig. 5th
    In the embodiments functionally identical parts are designated by the same reference numerals.
    The figures each show a length-adjustable connecting rod 1 for a reciprocating engine, such as an internal combustion engine.
    The connecting rod 1 has a first rod part 2 in the region of a large Pleuelauges 3 and a second rod member 4 in the region of a small connecting rod 5, wherein the large connecting rod 3 a crank pin bearing for connection to a crankshaft not shown and the small connecting rod 5 a piston pin bearing for Forming connection with a piston, not shown.
    The two rod parts 2, 4 can be moved relative to each other in the direction of the longitudinal axis la of the connecting rod 1 via a first helical gear 6. The first helical gear 6 has a first threaded part 7 and a second threaded part 8 engaged with the first threaded part 7, wherein one of the two threaded parts 7, 8 is formed as the first nut 9 and the other threaded part 8, 7 as the first spindle 10. In the illustrated embodiments, the first gear part 7 is formed as a sleeve-like nut 9 and the second gear part 8 as a spindle 10.
    For actuating the first helical gear 6, a second helical gear 16 is arranged in the connecting rod 1. The second helical gear 16 has a first gear part 17 and a second gear part 18 engaged with the first gear part 17, wherein one of the two gear parts 17, 18 is also designed as a nut 19 and the other gear part 18, 17 as a spindle 20. In the examples shown in the figures, the first gear part 17 is formed by a second nut 19 and the second gear part 18 by a second spindle 20.
    The first and second nuts 9, 19 each have at their insides on active surfaces with a pitch, which are spaced from the longitudinal axis la of the connecting rod 1 and which are formed as female screw with one thread or multiple threads, or as internal helical teeth. Correspondingly, the first and second spindles 10, 20 each have on their outer sides corresponding active surfaces with a pitch, which are spaced from the longitudinal axis la of the connecting rod 3 and which are formed as external screw thread with one thread or multiple threads, or as external helical teeth. The term "thread" (for example, in threaded part 7, 8) is generally used here for both screw thread, as well as for helical gears and thus covers both training from.
    The first threaded part 7 of the first helical gear 6 and the second gear part 18 of the second helical gear 16 are rotatably mounted, but axially immovably in the first rod part 2. The second threaded part 8 of the first helical gear 6 and the first gear part 17 of the second helical gear 16, however, are displaceable in the direction of the longitudinal axis la, but rotatably mounted in the first rod part 4. The second threaded part 8 is fixedly connected to the second rod part 4 or integral with this. The securing against twisting of the first gear part 17 via the first rotation 11, the securing of the second threaded part 8 via the second anti-rotation 12. The anti-rotation 11, 12 may be formed by simple screws which are screwed transversely to the longitudinal axis la in the first rod part 2 are.
    Fig. 1 shows an embodiment in which the first threaded part 7 of the first helical gear 6 is formed integrally with the second gear part 18 of the second helical gear 16. First threaded part 7 and second threaded part 18 thus form a double nut 13, which is guided axially displaceably outside in the receiving bore 14 of the first rod part 2. Reference numeral 15 denotes a threaded sleeve.
    In this embodiment, the active surfaces of the first threaded part 7 and the second threaded part 8, and the first gear part 17 and the second gear part 18 are each formed by threads. The first gear part 17 and the second gear part 18 in this case have threads with a relatively large pitch, the pitch angle is for example between 30 ° and 45 °.
    The first gear element 17 essentially has a threaded bolt 21 which widens in the direction of the large connecting rod eye 3 to form a piston 22. This first gear part 17 is secured by the first rotation 11 against rotation. A first spring 30 and a second spring 31 define the rest position of the first gear part 17. The large connecting rod 3 facing end face 23 of the piston 22 of the first gear part 17 span together with the first rod part 2 a pressure chamber 24, in which a pressure oil line 25 opens , At low pressure, the piston 22 and thus the first gear part 17 remains in its in Fig.l apparent lower position. This position is associated, for example, the maximum length of the connecting rod 1 with a high compression ratio. If the pressure in the pressure chamber 24 is increased, the piston 22 and thus the first gear part 17 in FIG. 1 is pushed up to its stop formed by the spring plate 26 and the double gear part 18 and the first threaded part 7 forming double nut 13 is twisted. The mode of action corresponds to that of a known drill.
    The internal thread of the first threaded part 7 of the double nut 13 pushes the second threaded part 8 and thus the second rod part 4 in the direction of the longitudinal axis la of the connecting rod 1, in the present case, the length of the connecting rod 1 is shortened and the compression ratio is reduced.
    If the pressure is lowered again, the first spring 30 overcomes the forces resulting from the oil pressure in the pressure chamber 24 and the second spring 31 and the piston 22 is moved together with the first gear part 7 in the direction of the large connecting rod eye 3. In this case, the second gear part 18 together with the first threaded part 7 is rotated back, whereby the second threaded part 8 together with the second rod part 4 in Fig. 1 is moved upward, whereby the length of the connecting rod 1 increases.
    Fig. 2 shows a variant in which the active surfaces of the first gear part 17 and the second gear part 18 of the second helical gear 16 are formed by helical gears. In particular, the first gear part 17 are formed with an external helical toothing and the second gear part 18 with an internal helical toothing. First threaded part 7 and second threaded part 8 of the first helical gear 6 can be designed as in FIG. 1 with internal thread or external thread or else with internal or external helical gears.
    The first gear part 17 together with the piston 22 is preferably made of light metal, for example aluminum, and has an outer helical toothing in its region facing the first helical gear 6.
    This external helical toothing is in engagement with an internal helical toothing of the second gear part 18. In the position shown in FIG. 2, the connecting rod 1 has its maximum length. A first spring 30 pushes the piston 22 in the direction of the large connecting rod eye 3. This spring 30 is so strong that the mass force can not lift the piston 22.
    So that the mass force remains small, is - as mentioned - on the one hand, the first gear part 17 made of light metal. On the other hand, the space above the piston 22 is filled with oil via a defined oil leakage between the piston 22 and the guide cylinder 27 and the deflection of the piston 22 is attenuated by mass inertial forces. The first anti-rotation 11 to prevent rotation of the first gear member is arranged in this embodiment by a notch or serration having coaxial with the longitudinal axis la and fixedly connected to the first rod member 2 bolt 29, which with a corresponding internal notching or serration of first gear part 17 cooperates.
    If the oil pressure in the pressure oil line 25 is increased, the first gear part 17 is lifted in the direction of the first helical gear 6. The pressure must be high enough to overcome the sum of the spring force of the first spring 30 and the inertia of the first gear part 17. Lifting the first gear member 17 causes the second gear member 18 to rotate, similar to a manual drill. The second gear part 18 is positively connected via a driver 28 with the first threaded part 7 of the first helical gear 6. The rotation of the second gear part 18 is thus transmitted directly to the first threaded part 7. The rotation of the first threaded part 7 is in turn converted into cooperation with the second threaded part 8 in a translational movement of the latter, wherein the firmly connected to the second threaded part 8 second rod member 4 is also deflected in the direction of the longitudinal axis la of the connecting rod 1. In this case - in the present case - the connecting rod 1 is shortened.
    In the rest position shown in Fig. 2, the piston 22 closes under the spring force of the first spring 30, the pressure oil passage 25 and the connecting rod 1 remains in its long position. So that during the cold start no pressure wave leads to a shortening of the connecting rod 1, in the pressure oil line 25, a temperature-sensitive flow control element, for example, with wax as wax, be arranged (not shown). With the temperature-sensitive flow control element, the pressure oil line 25 can be closed in the cold state. The pressure oil line is only released again when a sufficiently high temperature expands the expansion material and a corresponding valve body opens the flow cross-section of the pressure oil line 25. Thus, a shortening of the connecting rod 1 can be avoided during cold start of the engine.
    3 and 6 substantially correspond to the second embodiment shown in Fig. 2, wherein the bolt 29 is formed by a hexagon socket screw. The piston 22 is shown at elevated pressure in the pressure chamber 24 in its upper position, which corresponds to the minimum length of the connecting rod. As a backup of the bolt 29 against rotation is transverse to the longitudinal axis of a safety pin 29a - for example, a worm screw - arranged.
    权利要求:
    Claims (11)
    [1]
    1. Length-adjustable connecting rod (1) for a reciprocating engine, in particular for an internal combustion engine, with at least a first rod part (2) and a second rod part (4), which two rod parts (2, 4) relative to each other via at least a first helical gear in the direction of Longitudinal axis (la) of the connecting rod (1) are displaceable, wherein the first helical gear (6) has two threaded engagement with each other threaded parts (7, 8), of which a first threaded part (7) by a first nut (9) or first Spindle (10) and a second threaded part (8) by a first spindle (10) and first nut (9) is formed, characterized in that the first helical gear (6) via a second helical gear (16) is mechanically actuated, wherein the second helical gear (16) has two mutually engaged gear parts (17, 18), of which a first gear part (17) by a second nut (19) or second spindle (10) and a second r gear part (8) by a second spindle (10) and second nut (9) is formed.
    [2]
    Second connecting rod (1) according to claim 1, characterized in that the first spindle (10) and / or the second spindle (20) has an external thread or an external helical toothing and the corresponding first nut (9) or second nut (19). has an internal thread or an internal helical toothing.
    [3]
    3. connecting rod (1) according to claim 1 or 2, characterized in that the first helical gear (6) and the second helical gear (16) - relative to a mechanical effective direction -serially one behind the other, preferably coaxially with the longitudinal axis (la) of the connecting rod ( 1) are arranged,
    [4]
    4. Connecting rod (1) according to one of claims 1 to 3, characterized in that a first threaded part (7) of the first helical gear (6) rotatably connected to a second gear part (18) of the second helical gear (16) or integrally formed with this is.
    [5]
    5. Connecting rod (1) according to claim 4, characterized in that the non-rotatably connected to the second gear part (18) of the second helical gear (16) or integrally with this executed first threaded part (7) of the first helical gear (6) rotatable and in the direction the longitudinal axis (la) of the connecting rod (1) is mounted immovably in the first rod part (2).
    [6]
    6. connecting rod (1) according to one of claims 1 to 5, characterized in that the second helical gear (16) facing away from the second threaded part (8) of the first helical gear (6) with the second rod part (4) fixedly or integrally with this is executed, wherein preferably the relative rotational position of the rod parts (2, 4) to each other by at least one anti-rotation device (12) is fixed.
    [7]
    7. connecting rod (1) according to one of claims 4 to 6, characterized in that the rotatably connected to a first threaded part (7) of the first helical gear (6) second transmission part (18) of the second helical gear (16) rotatable and in the direction of Longitudinal axis (la) of the connecting rod (1) immovably in the first rod part (2) is mounted.
    [8]
    8. Connecting rod (1) according to one of claims 1 to 7, characterized in that the first helical gear (6) facing away from the first gear part (17) of the second helical gear (16) in the direction of the longitudinal axis (la) of the connecting rod (1) displaceable and rotationally fixed in the first rod part (4) is mounted.
    [9]
    9. Connecting rod (1) according to claim 8, characterized in that the preferably consisting of light metal first gear part (17) by at least one first spring (30) can be brought into a defined stroke position.
    [10]
    10. connecting rod (1) according to claim 9, characterized in that one of the first spring (30) oppositely directed second spring (31) acts on the first gear part (18).
    [11]
    11. Connecting rod (1) according to one of claims 1 to 10, characterized in that the first gear part (18) has a piston (22) or as a piston (22) is formed, which with a first helical gear (6) facing away from the front side (23) adjacent to a pressure chamber (24), in which at least one pressure oil line (25) opens, preferably in the pressure oil line (25), a temperature-sensitive flow control element is arranged.
    类似技术:
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    同族专利:
    公开号 | 公开日
    AT517718B1|2017-04-15|
    DE102016215280A1|2017-02-16|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US1784192A|1929-08-09|1930-12-09|Arthur D Macfarlane|Engine construction|
    GB441666A|1934-05-25|1936-01-23|Louis De Monge|Improvements in or relating to means for varying the cylinder clearance in internal combustion engines|
    DE4220664A1|1992-06-24|1994-01-05|Enrico Hilbert|IC engine with variable swept volume and compression ratio - involves displacement of stroke pin in axial direction to crankshaft for moving crankshaft bearing point and displacement of piston floor plane|
    DE4226361A1|1992-08-10|1994-04-07|Alex Zimmer|Fuel-air mixt. compressing IC engine - has remaining space during compression varied w.r.t. mixt. feed quality in direction of best compression ratio|
    US5406911A|1993-08-12|1995-04-18|Hefley; Carl D.|Cam-on-crankshaft operated variable displacement engine|
    WO2006115898A1|2005-04-28|2006-11-02|Laitram, L.L.C.|Variable-compression engine|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|
    DE102017107706A1|2017-04-10|2018-10-11|Avl List Gmbh|Length-adjustable connecting rod with a cylinder-piston unit with anti-rotation|
    DE102018122118B3|2018-09-11|2019-12-19|Dr. Ing. H.C. F. Porsche Aktiengesellschaft|Method for assembling an eccentric adjusting device of a connecting rod for a reciprocating piston internal combustion engine with a variable compression ratio|
    FR3101121B1|2019-09-23|2022-01-07|Renault Sas|Variable length connecting rod for a variable compression ratio combustion engine|
    DE102020108042A1|2020-03-24|2021-09-30|Schaeffler Technologies AG & Co. KG|Length-adjustable connecting rod, reciprocating internal combustion engine with such and a method for adjusting the compression ratio of a cylinder unit|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA50724/2015A|AT517718B1|2015-08-14|2015-08-14|LENGTH-ADJUSTABLE CONNECTING ROD|ATA50724/2015A| AT517718B1|2015-08-14|2015-08-14|LENGTH-ADJUSTABLE CONNECTING ROD|
    DE102016215280.7A| DE102016215280A1|2015-08-14|2016-08-16|Length adjustable connecting rod|
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