WO2020227751A1 - Bielle réglable en longueur présentant une courbure - Google Patents

Bielle réglable en longueur présentant une courbure Download PDF

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Publication number
WO2020227751A1
WO2020227751A1 PCT/AT2020/060204 AT2020060204W WO2020227751A1 WO 2020227751 A1 WO2020227751 A1 WO 2020227751A1 AT 2020060204 W AT2020060204 W AT 2020060204W WO 2020227751 A1 WO2020227751 A1 WO 2020227751A1
Authority
WO
WIPO (PCT)
Prior art keywords
connecting rod
piston
rod part
piston element
force transmission
Prior art date
Application number
PCT/AT2020/060204
Other languages
German (de)
English (en)
Inventor
Siegfried Lösch
Bernhard Kometter
Wolfgang Unzeitig
Christian Gallob
Martin Rath
Harald PRAMBERGER
Helfried Sorger
Original Assignee
Avl List Gmbh
Iwis Motorsysteme Gmbh & 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 Avl List Gmbh, Iwis Motorsysteme Gmbh & Co. Kg filed Critical Avl List Gmbh
Priority to DE112020002359.1T priority Critical patent/DE112020002359A5/de
Publication of WO2020227751A1 publication Critical patent/WO2020227751A1/fr

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Classifications

    • 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
    • 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
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D15/00—Varying compression ratio
    • F02D15/02—Varying compression ratio by alteration or displacement of piston stroke
    • 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 length-adjustable connecting rod for a reciprocating piston engine, in particular for a reciprocating internal combustion engine, having a first connecting rod part and a second connecting rod part, the two connecting rod parts being designed to be slidable towards and / or into one another, in particular telescopically, the second connecting rod part on its first connecting rod part facing end has a guide cylinder and the first connecting rod part has a piston element displaceable in the guide cylinder, wherein in a power transmission area from the first connecting rod part to the second connecting rod part, a power transmission surface and a bottom surface are arranged in such a way that at least part of a power flow from the first Connecting rod part to the second connecting rod part via a positive connection between the
  • the rod-like connecting element which is used in a reciprocating piston engine for the purpose of the invention is usually referred to as the connecting rod
  • the connecting rod is used to convert a linear movement of the reciprocating piston, in particular a linearly oscillating axial movement of the reciprocating piston, which is usually a power or working piston, into a circular movement of the reciprocating piston
  • a crankshaft in the context of the invention is a shaft which is designed to convert the linear-oscillating movement, in particular the translational movement, of one or more reciprocating pistons, in particular with the help of connecting rods, into a rotary movement, preferably in a reciprocating piston machine, or Convert rotary motion into translational motion.
  • a connecting rod For connection to the reciprocating piston and the crankshaft, a connecting rod usually has a connecting rod bearing at both ends, usually in the form of a connecting rod eye, the connecting rod usually having a smaller connecting rod eye at the piston end and a larger connecting rod eye at the crankshaft end, based on a functional installation state of a connecting rod in a reciprocating engine.
  • a reciprocating piston With the aid of a piston pin mounted in the small connecting rod eye, a reciprocating piston can be connected to the piston-side end of the connecting rod.
  • the connecting rod can be connected to the crankshaft via the larger connecting rod eye, with a connecting rod bearing designed as a slide bearing usually being arranged in the larger connecting rod eye, which can be lubricated with hydraulic medium, in particular with the engine oil of a reciprocating piston engine.
  • the connecting rod is generally rotatably mounted about an axis of rotation of the crankshaft and the piston pin, the distance between the two axes of rotation defining an effective or effective connecting rod length.
  • Length-adjustable connecting rods are therefore used in particular in reciprocating piston engines with a variable compression ratio to set the compression ratio.
  • Changing the compression ratio by changing the effective connecting rod length is known in principle from the prior art, for example from document WO 2015/055582 A2 and document WO 2018/060458 A1.
  • a length-adjustable connecting rod with a hydraulic length adjustment device with a hydraulic cylinder arranged inside the connecting rod having a first connecting rod shaft section and a second connecting rod shaft section which can be moved relative to one another along a longitudinal axis of the connecting rod and in particular telescopically one inside the other and can be pushed apart.
  • One of the two connecting rod shaft sections forms the hydraulic cylinder of the length adjustment device and the other connecting rod shaft section forms an associated hydraulic piston.
  • a hydraulically actuable control device is provided with a single-acting adjusting piston that can be axially displaced perpendicular to the crankshaft axis in a longitudinal center plane of the connecting rod.
  • the challenge is in particular to achieve the connecting rod strength required for operation in a reciprocating piston engine, in particular a reciprocating internal combustion engine for a vehicle:
  • mass and gas forces act on its components, so that the danger damage caused by wear and tear, for example.
  • WO 2018/060458 A1 discloses a length-adjustable connecting rod for a reciprocating piston engine, in particular for a reciprocating piston internal combustion engine, the connecting rod having at least a first connecting rod part and a second connecting rod part, the second connecting rod part having a section at its end facing the first connecting rod part with a guide cylinder, the first connecting rod part having a guide shaft at its end facing the second connecting rod part, the guide shaft of the first connecting rod part being at least partially received by the guide cylinder and being movable relative to the guide cylinder for adjusting an effective connecting rod length, in particular along a longitudinal axis of the connecting rod , wherein the first connecting rod part has a first stop surface and the second connecting rod part has a second stop surface, wherein a contact of the first stop surface on the second stop surface limits a relative movement in a first direction and at least one portion l a pressure force acting on the connecting rod along the longitudinal axis of the connecting rod is transmitted from the first connecting rod part to the second connecting rod
  • An adjustable-length connecting rod according to the invention for a reciprocating piston engine in particular for a reciprocating piston internal combustion engine, has a first connecting rod part and a second connecting rod part.
  • the two connecting rod parts are, in particular telescopic, designed to be movable towards and / or into one another.
  • the second connecting rod part has a guide cylinder at its end facing the first connecting rod part, and the first connecting rod part has a piston element that can be displaced in the guide cylinder.
  • At least one power transmission surface and at least one bottom surface are arranged in such a way that at least part of a power flow from the first connecting rod part to the second connecting rod part via a positive connection between the power transmission surface and the bottom surface can be transmitted, the force transmission surface having a convex curvature.
  • the invention is based in particular on the idea of avoiding load peaks in force-transmitting surfaces in the event of a pressure load and thus preventing deformation and / or damage to the force-transmitting surfaces.
  • excessive compressive stress can occur in the edge areas of the force-transmitting surfaces, also called edge supports, in the operating state.
  • Due to the convex curvature of the force transmission surface a form-fitting contact of the force transmission surface in its edge area on the bottom surface can be prevented, or at least reduced, in such a way that a shape-related contact and thus a force flow adapted to the pressure to be transmitted is dimensioned via the shape of the convex curvature can be.
  • a susceptibility to damage, caused by the high pressure forces and in particular by the increased number of components used, can be reduced.
  • the convex configuration of the force transmission surface according to the invention can promote a deformation of the convex curvature in the case of a form-fitting connection between the force transmission surface and the bottom surface.
  • a tip of the bulge that is to say an area furthest away from a base surface of the bulge, can bear against the bottom surface.
  • the arch can deform in such a way that more and more of the arch area is brought into contact with the floor surface.
  • a power transmission take place between the force transmission surface and the base surface via a cross section of the force transmission surface that is variable depending on a force to be transmitted, and a force absorption between the connecting rod parts is improved.
  • load peaks can arise in particular when force-transmitting surfaces do not meet one another in a flat, planar manner.
  • unevenness in the force-transmitting surfaces can cause local stress peaks when subjected to pressure, which can negatively affect the mechanical integrity of the force-transmitting surfaces and thus make the components more prone to damage.
  • the convex design of the force transmission surface and the resulting improved deformation properties reduce the effects of unevenness or unevenness in the surfaces.
  • a first force transmission surface is arranged on an end of the piston element facing the second connecting rod part and a first bottom surface is arranged such that it delimits the guide cylinder of the second connecting rod part.
  • Such an arrangement of the force-transmitting surfaces favors a positive connection of the force-transmitting surface and the bottom surface in a normal to the longitudinal axis of the first and second connecting rod parts, since the piston element can be guided in the guide cylinder in a position-stabilizing manner.
  • a flow of force between the connecting rod parts can thus be improved, in particular a transmission of a compressive force along a longitudinal axis of the connecting rod.
  • the first connecting rod part comprises a piston element and a piston rod, the piston element cooperating with the guide cylinder in order to adjust an effective length of the connecting rod.
  • the piston element has a cylinder bore and the piston rod is received in the cylinder bore.
  • the piston element is particularly preferably designed to be displaceable and lockable in the axial direction to the piston rod in order to enable a simplified adjustment of an effective length of a guide piston.
  • a second force transmission surface on an end of the piston rod facing the piston element and a second base surface are also preferred arranged limiting the cylinder bore of the piston element.
  • a stable guidance or position of the piston rod within the piston element along the longitudinal axis of the connecting rod can thus be improved. This improves the transmission of force between the piston rod and the piston element, and thus also the transmission of force within the piston element.
  • an outer surface of the piston element which faces the second connecting rod part can be designed as a first force transmission surface which is assigned to the first bottom surface of the guide cylinder for force transmission.
  • the first connecting rod part and / or the second connecting rod part has at least one element of a connecting rod bearing, preferably a connecting rod eye, wherein the first connecting rod part is particularly designed to be connected to a reciprocating piston of a reciprocating internal combustion engine.
  • the second connecting rod part is particularly designed to be connected to a crankshaft of a reciprocating internal combustion engine.
  • the first connecting rod part preferably has a smaller connecting rod eye which forms a piston pin bearing.
  • the second connecting rod part preferably has a larger connecting rod eye, which serves in particular as a crankshaft bearing.
  • the bottom surface which serves as a stop for the force transmission surface for force transmission, is preferably flat.
  • a contact of the force transmission surface on the floor surface can be made possible by its convex design in a larger angular range with respect to the longitudinal axis, the flat floor surface being usable evenly over its entire cross section as a point of articulation and for transmitting the power flow. In this way, slight misalignments of the connecting rod parts with respect to their longitudinal axis can be compensated for during operation and the formation of impact or abrasion edges can thus be avoided.
  • the convex curvature is formed over the entire cross section of a transition of the piston element and / or the piston rod into his / her force transmission surface.
  • the entire cross-section of the piston element based on the dimensioning predetermined deformation, can be used as an effective surface for power transmission with respect to the floor surface.
  • a maximum height of the curvature is formed on a longitudinal axis of the first connecting rod part, in particular the longitudinal axis of the connecting rod.
  • the maximum height of the bulge can also be referred to as the tip.
  • An approximate axis of symmetry or a longitudinal center axis of the connecting rod or one of the connecting rod parts can be used as the longitudinal axis.
  • the longitudinal axis of the first connecting rod part preferably coincides with the longitudinal axis of the second connecting rod part.
  • a contact of the force transmission surface on the bottom surface in a central cross-sectional area of the connecting rod can thus be beneficial and a flow of force along the longitudinal axis of the connecting rod can be improved. The occurrence of an axially deviating compressive force can thus be reduced and rapid wear of the force-transmitting surfaces can be prevented.
  • a maximum height of the convex curvature is in a range between 5 pm and 15 pm, preferably in a range between 8 pm and 12 pm.
  • the maximum height of the bulge is particularly preferably 10 ⁇ m. In this dimension, the curvature can be optimally deformed in order to enable improved power transmission.
  • Piston element has a circular cross-section at the transition to its force transmission surface.
  • a convex curvature over a circular cross section can be designed to be particularly uniform and can thus be optimized in terms of its deformation properties. Such an expression is particularly easy to dimension and manufacture.
  • the piston element and / or the piston rod preferably has a circular cross section at least over the length received by the guide cylinder and / or the piston element.
  • the guide cylinder and / or the piston element is more preferably designed to correspond to this.
  • a movement along a longitudinal axis can thus be guided in an improved manner and a force transmission along the longitudinal axis can be beneficial.
  • the curvature is designed as a spherical segment. Such a configuration can provide an optimally uniform surface with optimized deformation properties.
  • a radius of the spherical segment is in this case preferably a multiple larger than the cross section of the base area of the force transmission area.
  • a reciprocating piston engine according to the invention in particular a reciprocating piston internal combustion engine, is characterized in that it has at least one connecting rod according to the invention.
  • a vehicle according to the invention is characterized in that it has a reciprocating piston engine according to the invention.
  • FIG. 1 shows a schematic representation of a connecting rod according to the invention
  • FIG. 2 shows a longitudinal section of a connecting rod according to the invention
  • FIG. 3 shows an exploded view of a first variant of a connecting rod according to the invention in a partial sectional view
  • FIG. 4 shows an exploded view of a second variant of a connecting rod according to the invention in a partial sectional view
  • FIG. 5 shows an enlarged detail of a detailed view of the connecting rod according to the invention in a sectional illustration.
  • FIG. 1 shows a schematic view of a length-adjustable connecting rod 10 according to the invention with a first connecting rod part 11 and a second connecting rod part 12, the first connecting rod part 11 having a smaller one at a first, piston-side end Having connecting rod eye 13 for connecting the connecting rod 10 to a reciprocating piston of a reciprocating piston internal combustion engine.
  • the second connecting rod part 12 has a larger connecting rod eye 14 for connecting the connecting rod 10 to a crankshaft of the reciprocating piston engine.
  • the second connecting rod part 12 is connected to a bearing shell 22 via connecting rod bolts 23 and forms the larger connecting rod eye 14 with it.
  • the first connecting rod part 11 is adjustable in relation to the second connecting rod part 12 between an extended position and an inserted position in the direction of the longitudinal axis L of the connecting rod 10.
  • a length adjustment device 24 which can be charged with hydraulic medium, in particular oil or engine oil, is provided, which can be designed in various ways.
  • the second connecting rod part 12 has the smaller connecting rod eye 13 at a first, piston-side end for connecting the connecting rod 10 to a reciprocating piston
  • the second connecting rod part 12 in this case has the larger connecting rod eye 13 for connecting the connecting rod 10 to the crankshaft of the reciprocating piston engine.
  • the charging or draining of hydraulic medium takes place via hydraulic channels 25, 25 'and a hydraulic medium supply channel 26, which are controlled via a control device 27.
  • the hydraulic medium supply channel 26 is e.g. Connected via the larger connecting rod 14 to the hydraulic medium supply of a reciprocating internal combustion engine.
  • control device 27 With regard to the design of the control device 27, reference is made to known systems in the prior art, in particular those of the applicant.
  • Fig. 2 shows in a sectional view the embodiment of the length adjustment device 24, the control device 27 not being shown for reasons of clarity.
  • the second connecting rod part 12 has a section with a guide cylinder 15 at its end facing the first connecting rod part 11.
  • the first connecting rod part 11 has, at its end facing the second connecting rod part 12, a piston rod 19 and a piston element 20 embodied thereon or connected to it and configured to correspond to the guide cylinder 15.
  • Guide cylinder 15 and piston element 20 or piston rod 19 have, for example, a circular cross-section, but can also be oval or polygonal in cross-section.
  • the piston element 20 is shown in a central position in FIG.
  • Piston seals are located on the piston element 20 30 are provided, which are held in their position on the piston element 20 by holding elements 31. The piston seals 30 seal the piston element 20 from the guide cylinder 15 and thus also the pressure spaces 28, 29 from one another.
  • the upper pressure chamber 28 is bounded at the top by a cylinder cover 32 in which a piston rod seal 33 is arranged, which is also held in position by a holding element 31.
  • the piston element 20 is at least partially received by the guide cylinder 15 and can be moved relative to the guide cylinder 15 or the second connecting rod part 12 along a longitudinal axis L of the connecting rod 10 to adjust an effective connecting rod length PL relative to the guide cylinder 15.
  • the piston element 20 can be pushed into the guide cylinder 15 or pulled out of it. Pushing piston element 20 and guide cylinder 15 into one another shortens the effective connecting rod length PL, while pulling apart or pulling piston element 20 out of guide cylinder 15 increases the effective connecting rod length PL.
  • the piston element 20 is moved by alternately filling or draining the pressure chambers 28, 29 with hydraulic medium, which is controlled by the control device 27 shown in FIG. 1.
  • the effective connecting rod length PL can be set between a minimum effective connecting rod length PL and a maximum effective connecting rod length PL.
  • the effective connecting rod length PL is defined by the distance between the two axes of rotation of the connecting rod 10, around which the connecting rod 10 is on the piston side and the crankshaft side in a functional state of use can turn. These axes of rotation are essentially the piston pin of the reciprocating piston and the crankshaft.
  • the upper pressure chamber 28 When the maximum length PL is set, the upper pressure chamber 28 is drained and the lower pressure chamber 29 is filled with hydraulic medium.
  • the piston element 20 rests on the cylinder cover 32, which acts as an upper stop for the maximum achievable effective connecting rod length PL.
  • the upper pressure chamber 28 When the minimum length PL is set, the upper pressure chamber 28 is filled with hydraulic medium and the lower pressure chamber 29 is emptied of hydraulic medium.
  • the piston element 20 rests on a bottom surface 18 (see FIGS. 4 and 5) on the lower end of the guide cylinder 15 facing the larger connecting rod eye 14.
  • the first connecting rod part 11 has a piston rod 19 and a piston element 20 which is essentially embodied in one piece with it.
  • a first force transmission surface 17 is arranged on the lower end of the piston element 20, that is to say facing away from the small connecting rod eye 13.
  • a first bottom surface 18 is arranged to delimit the guide cylinder 15 of the second connecting rod part 12.
  • the first power transmission surface 17 and the first bottom surface 18 form power transmission surfaces and are designed to transmit at least part of a power flow F (see FIG. 2) via a positive connection between the first connecting rod part 11 and the second connecting rod part 12.
  • the force flow F can in particular be a compressive force which is created by the combustion pressure in the associated combustion chamber of the reciprocating piston engine and acts essentially along the longitudinal axis L of the connecting rod 10.
  • the first force transmission surface 17 has a convex curvature, which is shown in phantom in FIG. 3, the first bottom surface 18 is flat.
  • the curvature of the first force transmission surface 17 advantageously extends over the entire cross section of a transition of the piston element 20. More preferably, the base surface of the curvature of the first force transmission surface 17 has a circular cross section. In a variant (not shown) it can be provided that the first bottom surface 18 in the second connecting rod part 12 also has a convex curvature.
  • the first connecting rod part 11 includes the large connecting rod eye 14 and the second connecting rod part 12 includes the small connecting rod eye 13 and are used accordingly inverted in a reciprocating piston engine.
  • a power flow F can be transmitted via the first bottom surface 18 of the guide cylinder 15 into the first power transmission surface 17 of the piston element 20 from the second connecting rod part 12 into the first connecting rod part 11.
  • the first force transmission surface 17, the first bottom surface 18 or both force-transmitting surfaces 17, 18 have a convex curvature.
  • FIG 4 shows a second exemplary embodiment of a connecting rod 10 according to the invention, in which the piston rod 19 and the piston element 20 are designed as separate components, the piston element 20 engaging around the piston rod 19 at its end facing the second connecting rod part 12.
  • the piston element 20 At its end facing the first connecting rod part 11, the piston element 20 has a section with a cylinder bore 21 in which an internal thread 16 is preferably at least partially implemented.
  • a corresponding external thread 16 At the end of the piston rod 19 facing the piston element 20, a corresponding external thread 16 ‘is implemented on the outer wall.
  • the piston rod 19 and the piston element 20 are designed to be screwed together in order to adjust an effective length PL of the connecting rod 10 along the longitudinal axis L relative to the guide cylinder 15 of the second connecting rod part 12.
  • the internal thread 16 of the piston element 20 is preferably provided at a certain distance from the bottom of the cylinder bore 21 and from the opening of the cylinder bore 21 on the piston rod side.
  • the external thread 16 ′ in the piston rod 19 does not begin directly at the end facing the piston element 20, but only after a section without a thread. This on the one hand facilitates the manufacture of the piston element 20 because the The thread does not have to be carried out to the bottom of the cylinder bore 20.
  • the area of the piston rod 19 without thread together with the threadless bottom area of the cylinder bore 21 functions as a guide for the piston rod 19 in the piston element 20 and their mutual centering.
  • a second force transmission surface 117 (shown in phantom in FIG. 4) is arranged on an end of the piston rod 19 facing the piston element 20.
  • a second bottom surface 118 is arranged to delimit the cylinder bore 21 of the piston element 20.
  • the force transmission surface 1 17 and the bottom surface 1 18 form force transmission surfaces and are designed to transmit at least part of a force flow F (see FIG. 5) via a positive connection between the piston rod 19 and the piston element 20.
  • the force flow F can in particular be a compressive force which is created by the combustion pressure in the associated combustion chamber of the reciprocating piston engine and acts essentially along the longitudinal axis L of the connecting rod 10.
  • the force transmission surface 117 of the piston rod 19 has a convex curvature and the power flow F can be promoted by the convex curvature in the same way as shown above.
  • a force flow F within the first connecting rod part 11 is optimized by such an arrangement.
  • the curvature advantageously extends over the entire cross section of a transition of the piston rod 19.
  • exemplary embodiment of a connecting rod 10 it can be provided that the piston rod 19 forms the end of the first connecting rod part 11 facing the second connecting rod part 12 and, for example, screwed, clamped, pressed, glued or by means of another in the second connecting rod part usual mechanical fastening means is connected.
  • an outer surface of the piston rod 19 facing the second connecting rod part 12 can form the first force transmission surface 17 of the first connecting rod part 11.
  • FIG. 5 shows an enlarged section of the second exemplary embodiment of a connecting rod 10 according to the invention from FIG. 4 in the assembled state, two areas for force transmission of at least part of a compressive force F from the first connecting rod part 11 into the second connecting rod part 12.
  • a first force transfer within the piston element 20 from the piston rod 19 to the piston element 20 can take place via a positive connection of the second force transmission surface 1 17 and the second base surface 1 18, the second force transmission surface 1 17 having a convex curvature.
  • a second force transfer from the first connecting rod part 11 to the second connecting rod part 12 can take place between the piston element 20 and the guide cylinder 15 by means of a further form-fitting connection of the first force transmission surface 17 and the first base surface 18.
  • the force transmission surface 17 of the piston element 20 is formed by an outer surface of the piston element 20 facing the second connecting rod part 12.
  • the force transmission surface 17 has a convex curvature.
  • Fig. 3 shows an embodiment with a curved first power transmission surface 17 and a first bottom surface 18 between piston element 20 and guide cylinder 15, which according to the embodiment in FIG 20 is provided, only the power transmission between the curved second power transmission surface 1 17 and the second bottom surface 1 18 can be provided within the piston element 20.
  • the exemplary embodiments are merely examples that are not intended to restrict the scope of protection, the applications and the structure in any way. Rather, the preceding description provides a person skilled in the art with guidelines for implementing at least one exemplary embodiment, with various changes, in particular with regard to the function and arrangement of the described components, being able to be made without departing from the scope of protection as defined in the claims and yields these equivalent combinations of features.

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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)

Abstract

L'invention concerne une bielle réglable en longueur (10) pour une machine à piston alternatif, en particulier pour un moteur à combustion interne à piston alternatif, présentant une première partie de bielle (11) et une deuxième partie de bielle (12), les deux parties de bielle (11, 12) étant réalisées de manière déplaçable notamment télescopiquement l'une vers l'autre et/ou l'une dans l'autre, la deuxième partie de bielle (12) présentant, au niveau de son extrémité tournée vers la première partie de bielle (11), un cylindre de guidage (15) et la première partie de bielle (11) présentant un élément de piston (20) pouvant coulisser dans le cylindre de guidage (15), dans une région d'un transfert de force de la première partie de bielle (11) à la deuxième partie de bielle (12), au moins une surface de transfert de force (17, 117) et au moins une surface de fond (18, 118) étant disposées de telle sorte qu'au moins une partie d'un flux de forces de la première partie de bielle (11) à la deuxième partie de bielle (12) puisse être transmis par le biais d'une liaison par engagement par correspondance de formes entre la surface de transfert de force (17, 117) et la surface de fond (18, 118), la surface de transfert de force (17, 117) présentant une courbure convexe.
PCT/AT2020/060204 2019-05-15 2020-05-15 Bielle réglable en longueur présentant une courbure WO2020227751A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE112020002359.1T DE112020002359A5 (de) 2019-05-15 2020-05-15 Längenverstellbare Pleuelstange mit Wölbung

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Application Number Priority Date Filing Date Title
ATA50435/2019A AT522494B1 (de) 2019-05-15 2019-05-15 Längenverstellbare Pleuelstange mit Wölbung
ATA50435/2019 2019-05-15

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WO2020227751A1 true WO2020227751A1 (fr) 2020-11-19

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015055582A2 (fr) 2013-10-18 2015-04-23 Avl List Gmbh Bielle réglable en longueur
WO2018060458A1 (fr) 2016-09-30 2018-04-05 Avl List Gmbh Bielle réglable en longueur comprenant des surfaces de butée

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016215752A1 (de) * 2016-08-23 2018-03-01 Schaeffler Technologies AG & Co. KG Stellkolben einer Vorrichtung zur Veränderung des Verdichtungsverhältnisses einer Zylindereinheit einer Hubkolbenbrennkraftmaschine
AT519184B1 (de) * 2016-09-30 2018-07-15 Avl List Gmbh Längenverstellbares Pleuel mit Anschlagflächen

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015055582A2 (fr) 2013-10-18 2015-04-23 Avl List Gmbh Bielle réglable en longueur
WO2018060458A1 (fr) 2016-09-30 2018-04-05 Avl List Gmbh Bielle réglable en longueur comprenant des surfaces de butée

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AT522494B1 (de) 2021-02-15
AT522494A1 (de) 2020-11-15

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