• 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) with two telescopic connecting rod sections (2, 3). A connecting rod section (2) has a cylinder into which the piston (8) of the other connecting rod section (3) engages. The cylinder is closed by a cover through which the piston rod (11) of one connecting rod section (3) extends. The invention provides that the connecting-rod section (3) is produced in one piece with the piston (8) and subsequently broken in order to be able to thread the cover of the cylinder in. Subsequently, the piston rod (11) is joined together again, for example by electron beam welding.
    公开号:AT519947A2
    申请号:T50401/2018
    申请日:2018-05-14
    公开日:2018-11-15
    发明作者:
    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) with two telescopic connecting rod sections (2, 3). A connecting rod section (2) has a cylinder into which the piston (8) of the other connecting rod section (3) engages. The cylinder is closed by a cover through which the piston rod (11) of one connecting rod section (3) extends. The invention provides for the connecting rod section (3) to be produced in one piece with the piston (8) and then broken so that the cover of the cylinder can be threaded in. The piston rod (11) is then joined together in a materially integral manner, for example by electron beam welding.
    Fig. 1/8
    PP31953AT
    AVL List GmbH, iwis motorsysteme GmbH & Co. KG
    -1 Length-adjustable connecting rod with two telescopic connecting rod sections
    The invention relates to a length-adjustable connecting rod with two telescopic connecting rod sections, at least one connecting rod section having a piston at one end and a connecting rod eye at the other end, the connecting rod eye and piston being connected to one another via a piston rod.
    In the case of internal combustion piston engines, there are development tendencies to change the compression ratio during operation. There are various ways of doing this, such as raising or lowering the piston shaft bearing or making the connecting rod lengths adjustable. This can e.g. happen that the connecting rod eye is made adjustable via an eccentric, or that the connecting rod consists of two telescopic connecting rod sections, one section having a cylinder into which the other connecting rod section is immersed with a piston. In this embodiment, the connecting rod eye and the piston are connected to one another via a piston rod which has to be passed through a cover with which the cylinder of the other connecting rod section is sealed. Such an embodiment is shown, for example, in WO2015 / 055582. There the piston is screwed to the lower end of the upper connecting rod section using a cylinder screw. This construction allows the cover and other components to be pushed onto the piston rod and only then the piston is screwed on.
    A disadvantage of this solution, however, is that the piston rod has to be made relatively solid, since it has to accommodate the fastening screw for the piston inside.
    Against this background, the invention has for its object to provide a length-adjustable connecting rod in which the piston rod can be made relatively slim.
    This object is achieved in that the piston rod has a joint at which the piston rod is integrally joined.
    As in the prior art, before joining the two parts of a connecting rod section, all the components that must surround the piston rod when the length-adjustable connecting rod is assembled can be threaded before the piston rod is joined at the joint.
    / 8th
    PP31953AT
    AVL List GmbH, iwis motorsysteme GmbH & Co. KG
    It is particularly preferred here if the piston rod is broken and / or cracked and assembled again after the connecting rod section has been produced in one piece. This cracking is a common method to achieve mating surfaces that allow two parts to be reassembled exactly. The advantage for the connecting rod in question here is that the connecting rod can be produced in a conventional forging process and, after the broken sections have been joined together, takes on exactly the same shape as before the cracking. In addition, no additional mating surfaces have to be worked in, which ensures a precise fitting of the piston rod. In one embodiment, the connecting rod eye and the piston rod are made of the same material (e.g. steel), preferably in one piece. The connecting rod eye and the piston are advantageously connected to one another exclusively by means of the joint provided on the piston rod.
    According to a preferred embodiment, the joint is provided at the end of the piston rod on the eye side. It is thus located directly below the small connecting rod eye assigned to the reciprocating piston of the internal combustion engine.
    The invention also relates to a method for producing a connecting rod section for a length-adjustable connecting rod, the method being characterized in that after the connecting rod section has been produced in one piece, the piston rod is broken and / or cracked and, after assembly of at least parts of the other connecting rod section, is reassembled. The parts assigned to the other connecting rod section are usually the cover, which closes the cylinder space of the other connecting rod section and is penetrated by the piston rod.
    It is particularly preferred if the piston rod is electron beam welded at the joint. However, other integral joining methods are also conceivable, such as Brazing.
    Although the joining of the piston rod can also be carried out when the length-adjustable connecting rod has been assembled as a whole, it is preferred according to the invention that the joining of the piston rod takes place after the cover with which the cylinder is closed in the other connecting rod section has been threaded onto the piston rod and before the two telescopic connecting rod sections are inserted into each other. This has the advantage that when the piston rod is joined, the joint comes to lie far away from other, possibly heat-sensitive, components. Before 3/8
    PP31953AT
    AVL List GmbH, iwis motorsysteme GmbH & Co. KG
    For this purpose, the diameter (or the relevant cross-sectional dimension) of the piston rod is smaller than the diameter of the cylinder in which the piston is movably arranged, or of the piston, and more preferably smaller than the inside diameter (or the relevant cross-sectional dimension) of the thread to be threaded components. This diameter dimension of the piston rod is advantageously present in the area of the joint.
    An exemplary embodiment of the invention is explained in more detail below with reference to a drawing. Show it:
    Fig. 1 in a schematic view a length-adjustable connecting rod, and in
    Fig. 2 shows a connecting rod section from Fig. 1 before assembly in the other connecting rod section.
    As can be seen from Fig. 1, the length-adjustable connecting rod 1 consists of a lower connecting rod section 2 and an upper connecting rod section 3. The lower connecting rod section has a large connecting rod eye 4 with which the connecting rod is mounted on the crankshaft, while the upper connecting rod section has a small one Connecting rod eye 5, which receives the piston pin, not shown here, of the reciprocating piston of an internal combustion engine.
    The lower connecting rod section 2 has a cylinder 6 which projects radially from the large connecting rod eye 4 and which is closed at the upper end by a cylinder cover 7.
    A piston 8 located at the lower end of the upper connecting rod section 2 is arranged within the cylinder 6. The piston 8 is shown in FIG. 1 in a central position in which it divides the cylinder 6 into two pressure chambers 9 and 10.
    A piston rod 11 of the upper connecting rod section 3 extends from the piston 8 through the cylinder cover 7 and ends at the small connecting rod eye 5. The cylinder cover 7 has a seal 12 which surrounds the piston rod 11. In the same way, the piston 8 also has seals 13 and 14. The underside of the cylinder cover 7 forms a stop 15 when the piston 8 is in the upper position, while the cylinder bottom forms a stop 16 when the piston is in the lower position.
    At the upper end of the lower connecting rod section 2, an anti-rotation device 17 is provided, which interacts with a flat point 18 of the upper connecting rod section 3. Below the small connecting rod eye 5, a separating / joining point 19 is formed in the piston rod 11, at which the upper connecting rod section 3 is broken and then reassembled by electron beam welding.
    The operation of the length-adjustable connecting rod 1 is briefly explained below. The two pressure chambers 9 and 10 are each via a drain line, in each of which there is no / 8
    PP31953AT
    AVL List GmbH, iwis motorsysteme GmbH & Co. KG
    -4 shown check valve is located, and connected to the oil supply of the internal combustion engine via a controllable check valve. The connecting rod is adjusted by opening one of the pressure chambers so that oil can drain off. Due to the inertial forces, the piston then moves in the direction of the unpressurized pressure chamber until it has reached the respective stop. The piston 8 cannot retreat because the other pressure chamber can be filled with oil due to the check valve, but the oil cannot run off. If a different connecting rod length is to be set, it is the other way round. One pressure chamber is closed and the other is opened. Due to the forces acting on the upper connecting rod sections, the piston then moves in the direction of the unpressurized pressure chamber.
    The following explains in more detail how the length-adjustable connecting rod 1 is manufactured and assembled.
    First, the upper connecting rod section 3 shown in FIG. 2, including the small connecting rod eye 5 and piston 8, is produced in one piece, for example by forging. The upper connecting rod section 3 produced in this way is cracked at the separating / joining point 19, so that the small connecting rod eye 5 can be removed from the piston rod 11.
    Then the cylinder cover 7 is threaded onto the piston rod 11. After all the components that must sit on the piston rod 11 have been threaded, the small connecting rod eye is connected to the piston rod 11 at the joint 19, preferably by electron beam welding. The upper connecting rod section now has the appearance as in FIG. 2. The upper connecting rod section 3 thus completed is then inserted with the piston 8 into the cylinder 6 of the lower connecting rod section 2, the cylinder cover 7 in the usual manner, for example via a thread or also through a cohesive joining process is connected to the cylinder. Finally, the anti-rotation device 17 can also be applied. The connecting rod is now ready and can be installed.
    权利要求:
    Claims (8)
    [1]
    Expectations
    1. Length-adjustable connecting rod (1) with two telescopic connecting rod sections (2, 3), at least one connecting rod section (3) having a piston (8) at one end and a connecting rod eye (5) at the other end, whereby connecting rod eye (5) and piston (8) are connected to one another via a piston rod (11), characterized in that the piston rod (11) has a joint (19) at which the piston rod (11) is joined in a materially bonded manner.
    [2]
    2. Adjustable connecting rod according to claim 1, characterized in that the piston rod (11) is broken and / or cracked and assembled again after the connecting rod section (3) has been produced in one piece.
    [3]
    3. Length-adjustable connecting rod according to claim 1 or 2, characterized in that the joint (19) is provided at the end of the piston rod (11) on the eye side.
    [4]
    4. A method for producing a connecting rod section according to claim 1, characterized in that after the connecting rod section (3) has been produced in one piece, the piston rod (11) is broken and / or cracked and after assembly of at least parts (cylinder cover (7)) of the other connecting rod section (2 ) is put back together.
    [5]
    5. The method according to claim 4, characterized in that the piston rod is electron beam welded at the joint (19).
    [6]
    6. The method according to claim 4, characterized in that the piston rod (11) is brazed.
    [7]
    7. The method according to claim 4, characterized in that the piston rod (11) is connected at the joint by friction welding.
    [8]
    8. The method according to any one of claims 4 to 7, characterized in that the other connecting rod section (2) has a cylinder (6) into which the one connecting rod section (3) with its piston (8) is immersed, the cylinder (6) can be locked by a cover (7) which has a through opening for the piston rod (11) of the one connecting rod section (3), the cover (7) first being threaded onto the piston rod (11) before the piston rod (11) is assembled.
    类似技术:
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    同族专利:
    公开号 | 公开日
    WO2018206817A1|2018-11-15|
    AT519947B1|2019-10-15|
    AT519947A3|2019-02-15|
    DE102017110363A1|2018-11-15|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE3933103A1|1988-10-15|1990-04-19|Volkswagen Ag|Connecting rod especially made of lightweight metal - has a detachable bearing cover on the outside of which is an equalising mass|
    DE19812532A1|1998-03-21|1999-09-23|Audi Ag|Connecting rod for a reciprocating machine|
    DE10018064A1|2000-04-12|2001-10-25|Volkswagen Ag|Connecting rod for IC engine has small end, shaft and top section of big end made from material of lower specific weight than lower section of big end|
    DE102008030897B3|2008-06-30|2009-08-13|Ford Global Technologies, LLC, Dearborn|Bearing e.g. connecting rod bearing, mounting method for reciprocating piston engine of motor vehicle, involves fixedly connecting bearing housing parts by welding process, where welding of parts is performed in defined external region|
    DE102009018827A1|2009-04-24|2010-10-28|Neumayer Tekfor Holding Gmbh|Connecting rod and production of a connecting rod|
    US9316251B2|2011-12-19|2016-04-19|Mce-5 Development|Clip-fastened raceway for a variable compression ratio engine|
    AT514071B1|2013-10-18|2014-10-15|Avl List Gmbh|Length adjustable connecting rod|
    DE102015001066B3|2015-01-29|2015-10-22|Armin Brunner|Hydraulically adjustable connecting rod|
    AT516387B1|2015-03-31|2016-05-15|Avl List Gmbh|LENGTH-ADJUSTABLE CONNECTING ROD|
    AT519184B1|2016-09-30|2018-07-15|Avl List Gmbh|Length adjustable connecting rod with stop surfaces|
    DE102016120948A1|2016-11-03|2018-05-03|Avl List Gmbh|Connecting rod with adjustment mechanism between connecting rod and connecting rod|
    DE102016120943A1|2016-11-03|2018-05-03|Avl List Gmbh|Connecting rod with adjusting mechanism between connecting rod and piston rod|AT521686B1|2018-12-03|2020-04-15|Avl List Gmbh|Process for the aging of a weld seam on a length-adjustable connecting rod|
    AT522159B1|2019-03-08|2020-09-15|Avl List Gmbh|Screw connection for length-adjustable connecting rod with melt insert|
    AT16800U1|2019-03-08|2020-09-15|Avl List Gmbh|Screw connection for length-adjustable connecting rod with different thread pitches|
    AT522322B1|2019-05-15|2020-10-15|Avl List Gmbh|Connecting rod with positive connection|
    AT522985B1|2019-10-08|2021-07-15|Avl List Gmbh|Length-adjustable connecting rod with a sealing device|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DE102017110363.5A|DE102017110363A1|2017-05-12|2017-05-12|Longer adjustable connecting rod with two telescopic connecting rod sections|
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