WO2015074649A1 - Dispositif pour faire varier le taux de compression d'une unité de cylindre d'un moteur à combustion interne à piston alternatif - Google Patents

Dispositif pour faire varier le taux de compression d'une unité de cylindre d'un moteur à combustion interne à piston alternatif Download PDF

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Publication number
WO2015074649A1
WO2015074649A1 PCT/DE2014/200452 DE2014200452W WO2015074649A1 WO 2015074649 A1 WO2015074649 A1 WO 2015074649A1 DE 2014200452 W DE2014200452 W DE 2014200452W WO 2015074649 A1 WO2015074649 A1 WO 2015074649A1
Authority
WO
WIPO (PCT)
Prior art keywords
sleeve
shaft journal
connecting rod
eccentric body
piston
Prior art date
Application number
PCT/DE2014/200452
Other languages
German (de)
English (en)
Inventor
Klaus Daut
Original Assignee
Schaeffler Technologies AG & Co. KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Schaeffler Technologies AG & Co. KG filed Critical Schaeffler Technologies AG & Co. KG
Publication of WO2015074649A1 publication Critical patent/WO2015074649A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/04—Engines with variable distances between pistons at top dead-centre positions and cylinder heads
    • F02B75/045—Engines with variable distances between pistons at top dead-centre positions and cylinder heads by means of a variable connecting rod length
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C23/00—Bearings for exclusively rotary movement adjustable for aligning or positioning
    • F16C23/10—Bearings, parts of which are eccentrically adjustable with respect to each other
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C7/00—Connecting-rods or like links pivoted at both ends; Construction of connecting-rod heads
    • F16C7/06—Adjustable connecting-rods
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J1/00—Pistons; Trunk pistons; Plungers
    • F16J1/10—Connection to driving members
    • F16J1/14—Connection to driving members with connecting-rods, i.e. pivotal connections
    • F16J1/16—Connection to driving members with connecting-rods, i.e. pivotal connections with gudgeon-pin; Gudgeon-pins
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2360/00—Engines or pumps
    • F16C2360/22—Internal combustion engines

Definitions

  • the invention relates to a device for changing the compression ratio of a cylinder unit of a reciprocating internal combustion engine with a rotatably mounted in a connecting rod of a connecting rod, an eccentric connection between the connecting rod and receiving bores of a piston of the cylinder unit producing eccentric body, at an axial portion of a form-fitting with an adjustment having cooperating external teeth.
  • the ratio of the volume of the entire cylinder space to that of the compression space is designated by the compression ratio of a reciprocating internal combustion engine.
  • the compression ratio of a reciprocating internal combustion engine By increasing the compression ratio, the efficiency of the reciprocating internal combustion engine can be increased and thus overall fuel consumption can be reduced.
  • spark-ignited reciprocating internal combustion engines however, their tendency to knock increases with the increase in the compression ratio in full-load operation. The knocking is an uncontrolled self-ignition of the fuel-air mixture.
  • the compression ratio may be increased to improve the partial load efficiency without causing the aforementioned knocking.
  • a change in the compression ratio is also particularly advantageous for supercharged spark-ignition reciprocating internal combustion engines, as these are given a low overall compression ratio in terms of charging.
  • the compression ratio is also particularly advantageous for supercharged spark-ignition reciprocating internal combustion engines, as these are given a low overall compression ratio in terms of charging.
  • the connecting rod is connected to the piston via an adjustable eccentric body provided on the connecting rod eye.
  • the eccentric body is designed as a shaft journal which can be rotated in the connecting rod eye and receives a piston pin in an eccentric bore via a piston pin bearing.
  • the piston pin can serve as an eccentric body by being arranged on plain bearing bushes in the piston and mounted in the piston pin bearing by means of an eccentric to its longitudinal central axis extending portion.
  • a device of the type described in the preamble of claim 1 is known from DE 10 2005 055 199 A1.
  • the invention has the object of providing a suitable for large-scale production of the eccentric body and its storage in the connecting rod to create, which is inexpensive to produce.
  • the eccentric body should consist of a shaft journal which is enclosed at least radially by a sleeve produced without cutting, on whose outer lateral surface the external toothing produced by a chipless forming process and outer sliding surfaces are formed. Consequently, the sleeve is produced by means of a chipless forming process, preferably a deep-drawing process of a thin sheet metal, preferably steel sheet. In the two end regions of the sleeve, the corresponding sliding surfaces are formed on the outer circumferential surface thereof, with which the sleeve is mounted together with the shaft journal received by it in cheeks of the connecting rod eye.
  • the external toothing is formed on the sleeve, which is positively connected in the rotational direction with the adjusting element provided for actuating the eccentric body.
  • the shaft journal may have an eccentric to its longitudinal central axis extending bore, in which a piston pin is arranged.
  • the unit formed from the journal and the sleeve as a piston pin, this unit is then provided in its central region with an outer eccentric extending in the connecting rod eye and cylindrical sliding bearing sections in the end sections Engage receiving bores of the piston of the cylinder unit.
  • the chipless produced sleeve which is produced with a predetermined wall thickness equality, can be hardened after the forming process and already has a very low surface roughness, so that they are no longer ground. must be fen. Since distortion can occur on the sleeve during the hardening process, it is pressed onto the shaft journal, wherein the sleeve thereby adapts to the outer circumferential surface of the shaft journal, so that the distortion is compensated.
  • the shaft journal may preferably be made by machining or by sintering, whereby hardening of the shaft journal is eliminated since the hardened sleeve is arranged thereon.
  • the shaft journals and the sleeves can be paired before assembly.
  • the sleeve can also be used uncured and provided with a coating.
  • the shaft journal serves as a piston pin, provided in its central region an increase in diameter, the outer circumferential surface extends eccentrically to a longitudinal central axis of the shaft journal and an outer toothing provided at an axial portion is.
  • the concentrically extending end portions of the shaft journal take on spacers, which are rotatably guided in receiving bores of the piston.
  • the shaft journal must therefore first be machined on a CNC lathe to produce the eccentric and arranged on this gearing, then the teeth are made by milling, then the shaft journal is hardened and coated and finally ground.
  • the eccentric body can thus be produced only with a considerable amount of work and consequently relatively high costs.
  • Another disadvantage with this type of production of the toothing is that no gear inlet and no tooth outlet can be produced by the abovementioned individual steps of the production method on the toothing.
  • the sleeve is arranged by means of a press fit on the shaft journal.
  • the toothing on the sleeve based on their Leksserstre- be arranged in a central region.
  • the lying on both sides next to the teeth sections of the sleeve can be rotatably guided in the cheeks of the connecting rod, said sections having a surface suitable for a sliding bearing in the cheeks surface quality.
  • the sleeve forms all sections of the eccentric body on its outer circumferential surface, it is non-rotatably connected to the shaft journal. For this purpose, it is provided that go out of the sleeve driver, which engage positively in the shaft journal.
  • sleeves can, as further proposed, be designed as lugs bent inwards in the radial direction of the sleeve, which engage in recesses which are provided on at least one end face of the shaft journal. These tabs can thus be produced with little manufacturing effort during the non-cutting forming process.
  • the sleeve can also be fixed to the shaft journal by means of spot welding, or material of the sleeve can be clamped into the recesses.
  • the sleeve at at least one of its ends with radially outwardly facing retaining elements which engage behind an end face of the connecting rod eye.
  • the provided at one end of the sleeve retaining element may be formed as a peripheral flanged wheel, while at the other end formed as individual segments after assembly of the eccentric in the connecting rod to the outside are bent so that both end faces of the connecting rod are engaged behind and for a leadership of Eccentric body is provided in the axial direction.
  • the shaft journal step-like which has, for example, three diameter steps and wherein the sleeve is adapted in a corresponding manner with respect to their shape to this outer contour of the shaft journal.
  • the two outer stages each have a smallest and a largest diameter and the eccentric body is mounted on these two stages by means of the corresponding sleeve sections in the cheeks of the connecting rod eye.
  • the middle stage of the sleeve takes on the external teeth.
  • Such training of the lenzapfens and the sleeve is particularly suitable for mounting the sleeve on the shaft journal and the subsequent fixation of the two parts to each other.
  • special advantages arise from the entire design of the eccentric body for its assembly, in which an adjusting lever must be arranged on the toothing and the two end sections of the eccentric body have to be inserted into the cheeks of the connecting rod eye.
  • the cheeks of the connecting rod eye are adapted to the corresponding stages of the sleeve, so that a cheek are also provided with a smallest diameter of the connecting rod eye and the other cheek with a largest diameter of the connecting rod eye.
  • the eccentric body can be easily inserted into the connecting rod eye and into the internal toothing of the lever without the outer toothing of the sleeve possibly damaging the two sliding bearing surfaces arranged in the cheeks.
  • the invention also relates to a design of an eccentric body, which should then have three diameter steps, wherein two outer stages each have a smallest and a largest diameter at which the eccentric body is mounted in cheeks of the connecting rod and wherein the outer toothing is formed at a mean diameter , It is possible to provide an eccentrically extending bore for receiving the piston pin in the shaft journal or to form the shaft journal directly as a piston pin, in which case the receiving bores of the piston would have to coincide with the corresponding diameters of different sizes of the shaft journal ends.
  • FIG. 1 shows a connecting rod of a reciprocating internal combustion engine with an adjusting device for changing the compression ratio
  • FIG. 2 shows a sectional view of the connecting rod, from which the arrangement of an eccentric body and an adjusting device emerge;
  • Figure 3 is an enlarged scale perspective perspective view of a
  • FIG. 4 is a sectional view, a schematic diagram showing the connection of a piston with the eccentric body
  • FIG. 5 is a sectional view, enlarged in scale, of a sleeve surrounding a shaft journal in particular
  • FIG. 6 shows a partial view of the shaft journal and the sleeve in section
  • FIG. 7 shows a perspective illustration of the sleeve according to the invention
  • Figure 8 is a perspective view of the shaft journal according to the invention and Figure 9 is a perspective view of the sleeve according to the invention with the shaft journal disposed therein.
  • FIG. 1 shows a basic structure of an adjusting device provided on a connecting rod.
  • 1 denotes a connecting rod of a reciprocating internal combustion engine, which has a connecting rod bearing eye 2 for arranging the connecting rod on a crank pin of a crankshaft not shown in detail.
  • the connecting rod eye 2 is formed by the connecting rod 1 and a bearing cap 3.
  • a connecting rod shaft 4 leads to a connecting rod 5, which receives a piston pin bearing 6.
  • This piston pin bearing 6 serves to receive a piston pin, not shown, to which a piston of a corresponding cylinder unit is fixed, the latter components are also not shown.
  • an adjusting device 7 for changing a compression ratio of the cylinder unit, in which this connecting rod 1 is used, is provided in the region of the connecting rod 5.
  • the connecting rod 5 is formed with a larger inner diameter and receives an eccentric body 8. Since the piston pin bearing 6 is arranged within this eccentric body 8, its position relative to the connecting rod 1 can be adjusted.
  • the eccentric body 8 for its adjustment on an adjustment element 9 with tabs 10 and 10 a, on which joints 1 1 and 12 piston rods 13 and 14 attack.
  • the piston rod 13 is connected at its end remote from the joint 1 1 via another joint 15 with a control piston 16.
  • This adjusting piston 16 is longitudinally displaceably guided within a bore 17, wherein the bore 17 is provided in the connecting rod shaft 4.
  • the actuating piston 16 and the bore 17 define a pressure chamber 18.
  • the other piston rod 14, which is attached via the joint 12 to the tab 10, has at its other end a hinge 19, on which an actuating piston 20 is guided in a Bore 21 is sealingly guided, so that a pressure chamber 22 is formed.
  • the adjusting device 7 is in a position in which between a center 23 of the connecting rod bearing eye 2 and a center 24 of the piston pin bearing 6 a greatest distance is created. In this position of the adjusting device 7, the corresponding cylinder would the unit in which the connecting rod 1 is used to be operated with the highest compression ratio.
  • the piston rod 13 is in its position pushed farthest out of the bore 17, while the piston rod 14 has been completely retracted into the bore 21.
  • the pressure chambers 18 and 22 are supplied for this purpose with pressurized lubricant from the Pleuellagerauge 2, said lubricant preferably by means of an adjustable oil pump from an oil pan via an oil gallery through the crankshaft, not shown, through the connecting rod bearing, and finally a pressure line 25 fed becomes.
  • This pressure line 25 leads to a switching valve 26, which may be formed as a 4/2-way valve. From the switching valve 26 go from control lines 27 and 28, each leading to one of the two pressure chambers 18 and 22 respectively.
  • the connecting rod 1 without the hydraulic actuation of the adjusting element 9 and without the bearing cap 3 is shown.
  • the eccentric body 8 consists of a shaft journal 29, in which the piston pin bearing 6, offset from the longitudinal central axis, is arranged.
  • This shaft journal 29 is rotatably connected to the adjusting element 9, wherein for this purpose an external toothing 30 is provided on the shaft journal 29, in which an internal toothing 31 of the adjusting element 9 engages positively.
  • an external toothing 30 is provided on the shaft journal 29, in which an internal toothing 31 of the adjusting element 9 engages positively.
  • the shaft journal 29 is enclosed radially by a sleeve 32.
  • the shaft journal 29 and consequently also the sleeve 32 enclosing this radially are step-like, wherein a step 33 of a largest diameter of the sleeve 32 is arranged in a cheek 34 which has a bore 35 with a correspondingly largest internal diameter.
  • the sleeve 32 is designed with a middle diameter step 36, this step being provided with the external toothing 30.
  • both the sleeve 32 and the shaft journal 29 have a step 37 smallest Diameter on which the sleeve 32 is slidably guided in a bore 38 of a second cheek 39.
  • steps 33, 36 and 37 corresponding steps 33a, 36a and 37a of the shaft journal 29 are adapted, which can be seen in particular in FIG.
  • the piston pin bearing 6 arranged in the shaft journal 29 rotatably receives a piston pin 40 which is fixed with its ends in receiving bores 41 and 42 of a piston 43 of the corresponding cylinder unit of the internal combustion engine.
  • FIGS 5 and 6 show again on an enlarged scale, the stepped sleeve 32 shown, which is suitable due to this training for a precise assembly of the likewise stepped shaft journal 29. Furthermore, it is apparent from these figures that the sleeve 32 is provided at one end with a radially outwardly facing holding element in the form of an annular rim 44. This board 44 abuts in an annular recess 45 of the first cheek 34 and thus fixes the eccentric body 8 in this axial direction. Furthermore, it can be seen that the eccentric body 8 due to the step-like design of the sleeve 32 and the shaft journal 29 can advantageously be mounted in the connecting rod 5 without the risk that the external teeth 30 of the sleeve 32 damage the bore 35 provided in the sliding surface can.
  • FIGS. 7 to 9 show, on the one hand, the sleeve 32 as a single part, the step-like shaft journal 29 as a single part and, finally, the combination of these two components for forming the eccentric body 8.
  • the sleeve 32 is provided at its stages 33 and 37 each with sliding surfaces 46 and 47.
  • the external toothing 30 lying between these two sliding surfaces 46 and 47 in another radial plane, as well as the entire shaping of the sleeve 32 is produced in a chipless forming process.
  • the sleeve 32 is bounded by the board 43, while at the other end holding elements are provided which are formed as a single retaining tabs 48.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)

Abstract

L'invention concerne un dispositif pour faire varier le taux de compression d'une unité de cylindre d'un moteur à combustion interne à piston alternatif, qui comprend un corps d'excentrique (8) permettant de modifier la position de perçages de réception d'un piston de l'unité de cylindre par rapport à un œil de bielle. Le corps d'excentrique (8) présente, au niveau d'une partie axiale, une denture externe (30) coopérant par complémentarité de formes avec un élément de réglage (9). Le corps d'excentrique (8) peut être fabriqué à bon marché et est donc approprié à une production en grande série, en raison du fait qu'il est constitué d'un tourillon d'arbre (29) qui est entouré au moins radialement par un manchon (32), fabriqué sans enlèvement de copeaux, dont la surface d'enveloppe extérieure comporte la denture externe (30) réalisée au moyen d'un procédé de mise en forme sans enlèvement de copeaux et les surfaces de glissement extérieures (46 et 47).
PCT/DE2014/200452 2013-11-21 2014-09-08 Dispositif pour faire varier le taux de compression d'une unité de cylindre d'un moteur à combustion interne à piston alternatif WO2015074649A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013223746.4A DE102013223746B3 (de) 2013-11-21 2013-11-21 Vorrichtung zur Veränderung des Verdichtungsverhältnisses einer Zylindereinheit einer Hubkolbenbrennkraftmaschine
DE102013223746.4 2013-11-21

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WO2015074649A1 true WO2015074649A1 (fr) 2015-05-28

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PCT/DE2014/200452 WO2015074649A1 (fr) 2013-11-21 2014-09-08 Dispositif pour faire varier le taux de compression d'une unité de cylindre d'un moteur à combustion interne à piston alternatif

Country Status (2)

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DE (1) DE102013223746B3 (fr)
WO (1) WO2015074649A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150059683A1 (en) * 2013-08-27 2015-03-05 Hilite Germany Gmbh Internal combustion engine and connecting rod
JP2017110693A (ja) * 2015-12-15 2017-06-22 トヨタ自動車株式会社 可変長コンロッド、可変圧縮比内燃機関及び可変長コンロッドの製造方法
DE102019101269B3 (de) 2019-01-18 2020-07-09 Hochschule Heilbronn Exzenterverstelleinrichtung und längenverstellbare Pleuelstange für eine Verbrennungskraftmaschine

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017202773A1 (fr) * 2016-05-25 2017-11-30 ThyssenKrupp Metalúrgica Campo Limpo Ltda. Bielle pour moteur à combustion interne à taux de compression réglable
WO2017202775A1 (fr) * 2016-05-25 2017-11-30 ThyssenKrupp Metalúrgica Campo Limpo Ltda. Bielle pour moteur à combustion interne à taux de compression réglable
DE102016222494A1 (de) 2016-11-16 2018-05-17 Schaeffler Technologies AG & Co. KG Vorrichtung zur Veränderung eines Verdichtungsverhältnisses einer Zylindereinheit einer Hubkolbenbrennkraftmaschine
FR3067758B1 (fr) * 2017-06-20 2019-06-28 Renault S.A.S. Dispositif de reglage de taux de compression d'un moteur a combustion interne

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10211971A1 (de) * 2002-03-19 2003-10-02 Bayerische Motoren Werke Ag Vorrichtung zur Veränderung eines Verdichtungsverhältnisses einer Hubkolben-Brennkraftmaschine
DE102005055199A1 (de) 2005-11-19 2007-05-24 Fev Motorentechnik Gmbh Hubkolbenverbrennungskraftmaschine mit einstellbar veränderbarem Verdichtungsverhältnis
WO2010108582A1 (fr) * 2009-03-26 2010-09-30 Ixetic Bad Homburg Gmbh Dispositif destiné à faire varier le rapport de compression dans un moteur à combustion interne
DE102011002138A1 (de) * 2011-04-18 2012-10-18 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Verstellbare Pleuelstangenvorrichtung für eine Brennkraftmaschine und Brennkraftmaschine mit einer derartigen verstellbaren Pleuelstangenvorrichtung
US20130118455A1 (en) * 2011-11-14 2013-05-16 Hyundai Motor Company Variable compression ratio apparatus

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19813398C1 (de) * 1998-03-26 1999-09-09 Blodig Vorrichtung zur Verstellung des Verdichtungsverhältnisses und der Steuerzeiten bei Brennkraftmaschinen

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10211971A1 (de) * 2002-03-19 2003-10-02 Bayerische Motoren Werke Ag Vorrichtung zur Veränderung eines Verdichtungsverhältnisses einer Hubkolben-Brennkraftmaschine
DE102005055199A1 (de) 2005-11-19 2007-05-24 Fev Motorentechnik Gmbh Hubkolbenverbrennungskraftmaschine mit einstellbar veränderbarem Verdichtungsverhältnis
WO2010108582A1 (fr) * 2009-03-26 2010-09-30 Ixetic Bad Homburg Gmbh Dispositif destiné à faire varier le rapport de compression dans un moteur à combustion interne
DE102011002138A1 (de) * 2011-04-18 2012-10-18 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Verstellbare Pleuelstangenvorrichtung für eine Brennkraftmaschine und Brennkraftmaschine mit einer derartigen verstellbaren Pleuelstangenvorrichtung
US20130118455A1 (en) * 2011-11-14 2013-05-16 Hyundai Motor Company Variable compression ratio apparatus

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150059683A1 (en) * 2013-08-27 2015-03-05 Hilite Germany Gmbh Internal combustion engine and connecting rod
US9567901B2 (en) * 2013-08-27 2017-02-14 Hilite Germany Gmbh Internal combustion engine and connecting rod
JP2017110693A (ja) * 2015-12-15 2017-06-22 トヨタ自動車株式会社 可変長コンロッド、可変圧縮比内燃機関及び可変長コンロッドの製造方法
DE102019101269B3 (de) 2019-01-18 2020-07-09 Hochschule Heilbronn Exzenterverstelleinrichtung und längenverstellbare Pleuelstange für eine Verbrennungskraftmaschine

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