EP2764229A1 - Piston arrangement for a combustion chamber of an internal combustion engine, having a variable compression ratio - Google Patents

Piston arrangement for a combustion chamber of an internal combustion engine, having a variable compression ratio

Info

Publication number
EP2764229A1
EP2764229A1 EP12756660.2A EP12756660A EP2764229A1 EP 2764229 A1 EP2764229 A1 EP 2764229A1 EP 12756660 A EP12756660 A EP 12756660A EP 2764229 A1 EP2764229 A1 EP 2764229A1
Authority
EP
European Patent Office
Prior art keywords
piston
pin
piston pin
internal combustion
combustion engine
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
EP12756660.2A
Other languages
German (de)
French (fr)
Other versions
EP2764229B1 (en
Inventor
Dieter Nowak
Tilmann RÖMHELD
Michael Wagenplast
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mercedes Benz Group AG
Original Assignee
Daimler AG
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 Daimler AG filed Critical Daimler AG
Publication of EP2764229A1 publication Critical patent/EP2764229A1/en
Application granted granted Critical
Publication of EP2764229B1 publication Critical patent/EP2764229B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F02F3/0015—Multi-part pistons
    • F02F3/0069—Multi-part pistons the crown and skirt being interconnected by the gudgeon pin
    • 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
    • F02B75/044—Engines with variable distances between pistons at top dead-centre positions and cylinder heads by means of an adjustable piston length
    • 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

Definitions

  • Piston assembly for a variable compression ratio having
  • the invention relates to a piston assembly for a changeable
  • Compression ratio having combustion chamber of an internal combustion engine according to the preamble of claim 1.
  • DE 33 46 967 C2 discloses a plunger with variable compression height for internal combustion engines, wherein the piston crown with at least a portion of the
  • Piston ring section axially displaceable on the piston pin receiving the lower part is arranged.
  • the plunger two fillable with pressure oil, interconnected chambers are provided, the respective volume at
  • a first chamber is located as a control chamber directly below the piston head, while a second chamber is arranged as a damping chamber below the control chamber.
  • the pressure oil is guided via valves, one of which is designed as a pressure-limiting valve and arranged between the control chamber and an open space to the crankcase. It is provided that the damping chamber is arranged divided inside the piston and is limited by an emanating from the center of the piston crown approach, a central
  • DE 36 38 783 C2 is a device for controlling the oil supply in a
  • the control chamber is between an inner piston part and arranged on this slidably guided outer piston part.
  • the control chamber is arranged via an oil bore arranged in the inner piston part, in the course of which a non-return valve opening in the direction of the control chamber is inserted, which opens into an oil groove in a connecting rod bushing of the connecting rod articulated on the inner piston part via a hollow piston pin forming an oil reservoir and which is connected to one of the Oil groove through through the shaft of a through
  • Pleuellager worn connecting rod up to a disputedölnutin longitudinal oil hole and a crank pin between the control oil and a main oil hole extending transverse bore connected to the lubricating oil circuit of the internal combustion engine.
  • DE 10 2009 048 172 A1 discloses a piston for an internal combustion engine having a variable compression ratio.
  • the piston comprises a first piston part and a second piston part, which are coupled relative to each other while forming at least a first, with a pressure medium, in particular a pressurized fluid, acted upon and variable in volume chamber. It is provided that at least one switchable
  • Valve means is disposed on the inside of a piston skirt of the piston, by means of which a volume of the pressure medium in the first chamber is adjustable.
  • Combustion chamber is possible.
  • Such a piston arrangement for a combustion chamber having a variable compression ratio, in particular a cylinder, of an internal combustion engine designed in particular as a reciprocating internal combustion engine, in particular of a motor vehicle comprises a piston and a device for variably setting the compression ratio assigned to the combustion chamber
  • the piston assembly further includes a piston pin.
  • the piston pin is coupled to the piston via respective connection areas.
  • the piston pin for example, in receiving openings, in particular
  • the piston received at least partially.
  • the piston pin is the piston with a connecting rod of the internal combustion engine
  • the piston can be articulated via the piston pin and the connecting rod with a crankshaft of the internal combustion engine, so that translational
  • Movements of the piston in the combustion chamber can be converted relative to this in a rotational movement of the crankshaft.
  • the device comprises the piston pin. It has the
  • Piston pin at least one with respect to the connection region of the piston pin eccentrically arranged eccentric element, via which the piston can be coupled to the connecting rod. If the piston pin is coupled to the connecting rod via the eccentric element and the piston pin becomes about the longitudinal central axis of the eccentric element formed at least substantially in the form of a right circular cylinder relative to the connecting rod and about the longitudinal center axis of at least one, at least substantially in the form of a straight circular cylinder connecting portion the piston pin is rotated relative to the piston, so causes this rotation of the piston pin relative to the connecting rod and relative to the piston due to the eccentric arrangement of the piston
  • Compression ratio is realized in a particularly simple and thus cost and space-saving manner. Moreover, it is possible by means of the piston assembly according to the invention to adjust the compression ratio as needed and to different
  • the piston assembly further has not only a very high compactness but also a very high equal part ratio compared to a conventional piston assembly, which allows no adjustment of the compression ratio on. This benefits the low cost.
  • the device comprises at least one control element.
  • the control is movable on the piston relative to the piston and relative to the piston pin between at least two positions.
  • the control element is displaceable obliquely or perpendicular to the longitudinal extent of the piston pin, which is why the control is also referred to as a control slide.
  • the control in the first position, the control causes depending on the rotational position of the piston pin locking of the piston pin or rotation of the piston pin relative to the piston. So either the compression ratio can be maintained or changed
  • Piston arrangement preferably due to centrifugal or inertial forces of the moving piston in the combustion chamber and / or due to prevailing in the combustion chamber and acting on the piston pressure forces.
  • Fig. 1 is a schematic perspective view of a piston pin with a
  • FIG. 2 shows a schematic perspective view of the piston pin according to FIG. 1;
  • Fig. 3 shows a detail of a schematic side view of a piston assembly for a variable compression ratio
  • Cylinder of a reciprocating internal combustion engine with a piston shown in transparent, which is articulated via the piston pin of Figures 1 and 2 with a connecting rod of the piston assembly, wherein the piston assembly comprises means by which the compression ratio is adjustable.
  • FIG. 4 is a schematic side view of the piston of FIG. 3 with a control of the device in its first position;
  • FIG. 5 shows a further schematic side view of the piston according to FIG. 4;
  • Figure 6 is another schematic side view of the piston of Figures 4 and 5 with the control in its second position;
  • FIG. 7 shows a further schematic side view of the piston according to FIG. 6;
  • FIG. 10 shows a detail of a further schematic perspective view of the piston according to FIG. 9;
  • FIG. 10 shows a detail of a further schematic perspective view of the piston according to FIG. 9;
  • FIGS. 9 and 10 are schematic perspective views of the piston according to FIGS. 9 and
  • FIGS. 8a-e show a piston pin 10 of a piston assembly 12 (Fig. 3), via which a piston 14 of the piston assembly with a connecting rod 16 is designed to be designed as a reciprocating internal combustion engine engine articulated.
  • the internal combustion engine comprises a crankshaft 18 which is rotatably mounted in a crankcase about an axis of rotation 20 relative to the crankcase.
  • the crankshaft 18 includes a crank pin on which the connecting rod 16 is articulated via a large connecting rod.
  • the connecting rod 16 further comprises a small connecting rod eye, in which the piston pin 10 is partially received.
  • the piston pin 10 is coupled to the piston 14 via respective connection portions 22.
  • the connecting portions 22 of the piston pin 10 are through a
  • Connecting regions are formed at least substantially in the form of a right circular cylinder.
  • the connecting portions 22 are formed at least partially in each case, in this case as
  • the piston pin 10 is indirectly connected to the piston 14.
  • the piston assembly 12 comprises a
  • Piston pin bushing 28 in which the right connection portion 22 of the piston pin 10 is arranged.
  • the piston pin bushing 28 in the corresponding
  • the piston pin bushing 28 acts as Stop for the piston pin 10 and allows easy mounting of the
  • the piston pin 10 has an eccentric element 23, which at least in
  • the piston pin 10 which has a longitudinal extent indicated by a directional arrow 30, has a receiving opening 32, which is designed, for example, as a passage opening.
  • Receiving opening 32 extends at least substantially perpendicular to the longitudinal extent (direction arrow 30) of the piston pin 10th
  • a locking element in the form of a locking bolt 34 is received in the receiving opening 32.
  • the locking pin 34 is guided in the receiving opening 32 perpendicular to the longitudinal extent of the piston pin 10 relative to the piston pin 10 slidably.
  • FIG. 3 it can be seen that at least the piston pin 10 and the locking pin 34 of a device 36 of
  • Piston assembly 12 are assigned. By means of the device 36, it is possible to adjust the compression ratio of the piston assembly 12 associated cylinder of the internal combustion engine variable.
  • the device 36 also includes a control in the form of a spool 38.
  • the spool 38 is held on the piston 14 and displaceable relative to the piston 14 and relative to the piston pin 10 between two positions.
  • the spool 38 is displaceable only between the two positions.
  • the spool 38 is thus a so-called bistable control piston.
  • a first position shown in particular in FIGS. 4 and 5, of the control slide 38, the latter is held by means of a first magnet.
  • the first magnet is arranged on the piston 14.
  • the spool 38 In the second position shown in particular in FIGS. 3, 6 and 7, the spool 38 is held by means of a second magnet, wherein also the second magnet is held on the piston 14.
  • a sleeve 44 of the device 36 can be seen, in which the spool 38 is slidably received.
  • a movement of the locking bolt 34 between a release position and a locking position of the locking bolt 34 can be effected or prevented or locked.
  • the displacement of the spool 38 between its two positions can in turn be done by means of an actuator, such as an electromagnet or by means of oil pressure.
  • the spool 38 is moved by means of oil pressure.
  • the piston 14 in its piston skirt 40 has two passage openings 42 lying opposite one another.
  • a biasing member 46 for example, an oil spray nozzle, lubricating oil of the internal combustion engine in the grooves 43 and in the
  • the spool 38 By applying the one end face of the spool 38, the spool 38 is displaced in the direction of the other end face, which is not acted upon by lubricating oil.
  • an oil spray nozzle 47 can also be seen, by means of which the piston 14 is sprayed with lubricating oil and thus can be cooled.
  • the biasing element 46 is arranged in the cylinder bore of the cylinder. In other words, the application or the control of the spool 38 takes place from outside the piston 14 via the cylinder bore and thus from outside the piston 14 ago.
  • the grooves 43 which may also be formed as elongated holes serve to receive the lubricating oil via the rotation of the crankshaft 18 and thus over the translational movement of the piston 14 in the cylinder and guide the lubricating oil to the through holes 42 and over to the spool 38th ,
  • the spool 38 serves for the so-called pilot control of lubricating oil of the internal combustion engine, by means of which the locking bolt 34 between at least one release position and at least one locking position of the
  • Locking bolt 34 is moved.
  • the lubricating oil for adjusting the locking bolt 34 is transferred via bearings of the crankshaft 18 on the crankcase to the crankshaft 18 and via appropriate channels on to the connecting rod 16. From the connecting rod 16, the lubricating oil flows to an outer circumferential side circumferentially completely circumferential first groove 48 of the piston pin 10. From the first groove 48, the lubricating oil flows through at least one corresponding connecting channel to a second groove 50 of the piston pin 10, which in the circumferential direction of the piston pin 10 outside circumference just as completely revolving. From the second groove 50, the lubricating oil can flow to corresponding channels 56, 58 in the piston 14.
  • Fig. 5 shows the spool 38 in its first position.
  • the locking bolt 34 is initially in its blocking position, in which it on the side of - relative to the image plane of FIG. 5 - right groove 43 cooperates with the piston 14 and prevents rotation of the piston pin 10 relative to the piston 14.
  • the piston pin 10 can only be rotated in the small connecting rod eye of the connecting rod 16 about the longitudinal central axis of the eccentric element 23 relative to the connecting rod 16, so that the piston 14 is pivotally coupled via the piston pin 10 to the connecting rod 16.
  • the locking pin 34 is partially received in the receiving opening 32 and partially in a arranged on the side of the right groove 43 first receptacle in the piston 14.
  • the first channel 56 in the piston 14 can be supplied with lubricating oil.
  • a supply of the second channel 58 in the piston 14 with lubricating oil is prevented by the spool 38. 5
  • the lubricating oil flows in the first position of the spool 38 from the connecting rod 16 via the grooves 48, 50 in the right first channel 56 and from there on to a right in this position of the piston pin 10 first end side 52nd of the locking bolt 34. This means that the first end face 52 is acted upon by the lubricating oil.
  • the lubricating oil now pushes the locking pin 34 in the radial direction of the piston pin 10 in the receiving opening 32 and so from its blocking position in his
  • a spring element may be arranged, via which the locking pin 34 is supported on the piston pin 10 under Federkraftbeetzung.
  • the spring force is directed in the radial direction of the piston pin 10 to the outside. This means that then the lubricating oil pushes the locking bolt 34 against the spring force into the receiving opening 32 and out of the first receptacle. If the locking pin 34 is completely moved out of the first receptacle, it is in its release position. In the release position, the locking bolt 34 can no longer prevent a relative rotation of the piston pin 10 to the piston 14.
  • the piston pin 10 can then be rotated in the small connecting rod eye of the connecting rod 16 about the longitudinal center axis of the eccentric element 23 relative to the connecting rod 16 and in the receiving openings 26 about the respective longitudinal center axes of the connecting portions 22 relative to the piston 14.
  • Such a relative rotation for example, by mass and / or centrifugal and / or prevailing in the cylinder and acting on the piston 14 compressive forces due to eccentric arrangement of the eccentric member 23 relative to the connecting portions
  • the distance between the piston 14 and the rotation axis is reduced or increases the distance between the piston 14 and a combustion chamber roof of the cylinder, whereby the compression ratio ( ⁇ ) is reduced.
  • the distance between the piston 14 and the rotation axis 20 is increased by pulling the piston 14 away from the rotation axis. This sets a higher compression ratio.
  • the pressing and pulling of the piston 14 causes via its coupling with the
  • Piston pin 10 the rotation of the piston pin 10 relative to the piston 14 and relative to the connecting rod 16 when the locking pin 34 is in its release position.
  • the piston pin 10 rotates by 180 degrees - with respect to the image plane of FIG. 5 - to the left, ie counterclockwise. If the receiving opening 32 is formed as a passage opening, the lubricating oil then acts via the first right channel 56 on a second end face 54 of the first end 52 remote from the first end 52
  • Locking bolt 34 and pushes the locking pin 34 together with the spring force of the spring element in the radial direction outwardly of the receiving opening 32 addition.
  • the locking pin 34 is thus moved from its release position back to its blocking position. Then the locking pin 34 acts on the side of the - related to the image plane of Fig. 5 - left groove 43 with the piston 14 together, so that then again a rotation of the piston pin 10 is prevented relative to the piston 14.
  • the piston pin 10 is locked.
  • the locking bolt 34 is, for example, partially in the receiving opening 32 and partially arranged in a side of the left groove 43 second
  • the lubricating oil is not only used to move the locking bolt 34 but also to lock this in the locked position and thus also fulfills a locking function.
  • the supply of the right-hand first channel 56 is ended with lubricating oil.
  • the left second passage 58 is supplied with lubricating oil.
  • the lubricating oil can then flow from the connecting rod 16 via the grooves 48, 50 in the left second channel 58 and from there to the left in the current position of the piston pin first end face 52. This means that now again the first end face 52 (not the second Face 54) is acted upon with lubricating oil.
  • the lubricating oil pushes the
  • Locking bolt 34 again in its release position.
  • the piston pin can turn 180 degrees again, only this time to the right, so clockwise. This in turn is not caused by an active actuator but essentially passive by the centrifugal and / or mass and / or pressure forces.
  • Piston assembly 12 can be displayed. It can be provided at least one further spool as the spool 38, so that by means of the other
  • Compression ratios is the piston pin 10, for example, over its two
  • Piston pin 10 is mounted. Analogous to the rotation of the piston pin 10 relative to the piston 14 by moving the spool 38 can then
  • Spool be effected so that thereby the piston 14 is adjusted relative to the axis of rotation 20 and relative to the combustion chamber roof.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Abstract

The invention relates to a piston arrangement (12) for a combustion chamber, in particular a cylinder, having a variable compression ratio, of an internal combustion engine, which comprises a piston (14), a device (36) for variably adjusting the compression ratio associated with the combustion chamber, and a piston rod (10) which is coupled to the piston (14) by means of connecting areas (22, 24), and via which the piston (14) can be coupled to a connecting rod (16) of the internal combustion engine. Said device (36) comprises the piston rod (10) which has at least one eccentric element (23) which is eccentrically arranged in relation to the connecting area (22) of the piston rod (10) and via which the piston rod (10) can be coupled to the connecting rod (16).

Description

Daimler AG  Daimler AG
Kolbenanordnung für einen ein veränderbares Kompressionsverhältnis aufweisenden Piston assembly for a variable compression ratio having
Brennraum einer Verbrennungskraftmaschine  Combustion chamber of an internal combustion engine
Die Erfindung betrifft eine Kolbenanordnung für einen ein veränderbares The invention relates to a piston assembly for a changeable
Kompressionsverhältnis aufweisenden Brennraum einer Verbrennungskraftmaschine gemäß dem Oberbegriff von Patentanspruch 1. Compression ratio having combustion chamber of an internal combustion engine according to the preamble of claim 1.
Die DE 33 46 967 C2 offenbart einen Tauchkolben mit variabler Kompressionshöhe für Verbrennungsmotoren, bei dem der Kolbenboden mit zumindest einem Teil der DE 33 46 967 C2 discloses a plunger with variable compression height for internal combustion engines, wherein the piston crown with at least a portion of the
Kolbenringpartie axial relativ verschiebbar auf dem den Kolbenbolzen aufnehmenden Unterteil angeordnet ist. Bei dem Tauchkolben sind zwei mit Drucköl füllbare, miteinander verbundene Kammern vorgesehen, deren jeweiliges Volumen sich bei Piston ring section axially displaceable on the piston pin receiving the lower part is arranged. In the plunger two fillable with pressure oil, interconnected chambers are provided, the respective volume at
Relativverschiebung des Kolbenbodens in reziprokem Verhältnis zueinander ändert und von denen eine erste Kammer als Steuerkammer direkt unter dem Kolbenboden liegt, während eine zweite Kammer als Dämpfungskammer unterhalb der Steuerkammer angeordnet ist. Bei dem Kolben ist weiterhin das Drucköl über Ventile geführt, von denen eines als Druckbegrenzungsventil ausgebildet und zwischen Steuerkammer und einem zum Kurbelgehäuse offenen Raum angeordnet ist. Dabei ist vorgesehen, dass die Dämpfungskammer im Inneren des Kolbens unterteilt angeordnet ist und begrenzt ist von einem von der Mitte des Kolbenbodens ausgehenden Ansatz, einer zentralen Relative displacement of the piston head in reciprocal relationship to each other changes and of which a first chamber is located as a control chamber directly below the piston head, while a second chamber is arranged as a damping chamber below the control chamber. In the case of the piston, furthermore, the pressure oil is guided via valves, one of which is designed as a pressure-limiting valve and arranged between the control chamber and an open space to the crankcase. It is provided that the damping chamber is arranged divided inside the piston and is limited by an emanating from the center of the piston crown approach, a central
Ausnehmung des Kolbenunterteils, in die der Ansatz eingreift, einem am Recess of the piston lower part, in which engages the approach, an am
kolbenbodenseitigen Ende der Ausnehmung in diese Ausnehmung radial hineinragenden Kragen des Kolbenunterteils, welcher die beiden Kammern voneinander trennt, sowie einer lösbar an dem Ansatz befestigbaren Dichtscheibe, die durch eine mit dem Ansatz verschraubte Schraube gehalten ist. piston bottom side end of the recess in this recess radially projecting collar of the piston lower part, which separates the two chambers from each other, as well as a releasably attachable to the approach sealing washer, which is held by a bolt screwed to the approach.
Der DE 36 38 783 C2 ist eine Vorrichtung zur Steuerung des Ölzulaufes in eine DE 36 38 783 C2 is a device for controlling the oil supply in a
Steuerkammer des Kolbens mit veränderlicher Kompressionshöhe für Control chamber of the variable compression piston for
Verbrennungskraftmaschinen als bekannt zu entnehmen. Die Steuerkammer ist zwischen einem Innenkolbenteil und an diesem verschiebbar geführten Außenkolbenteil angeordnet. Die Steuerkammer ist über eine im Innenkolbenteil angeordnete Ölbohrung, in deren Verlauf ein in Richtung zur Steuerkammer hin öffnendes Rückschlagventil eingesetzt ist, die in eine Ölnut in einer Pleuelbuchse der am Innenkolbenteil über einen einen Ölvorratsraum bildenden hohlen Kolbenbolzen angelenkten Pleuelstange ausmündet und die über eine von der Ölnut aus durch den Schaft der durch ein Internal combustion engines to be known as known. The control chamber is between an inner piston part and arranged on this slidably guided outer piston part. The control chamber is arranged via an oil bore arranged in the inner piston part, in the course of which a non-return valve opening in the direction of the control chamber is inserted, which opens into an oil groove in a connecting rod bushing of the connecting rod articulated on the inner piston part via a hollow piston pin forming an oil reservoir and which is connected to one of the Oil groove through through the shaft of a through
Pleuellager getragenen Pleuelstange bis zu einer steuerölnutführenden Längsölbohrung und eine im Kurbelzapfen zwischen der Steuerölnut und einer Hauptölbohrung sich erstreckende Querbohrung an den Schmierölkreislauf der Brennkraftmaschine angeschlossen. Pleuellager worn connecting rod up to a steuerölnutführenden longitudinal oil hole and a crank pin between the control oil and a main oil hole extending transverse bore connected to the lubricating oil circuit of the internal combustion engine.
Dabei ist vorgesehen, dass das Pleuellager über einen Teil seines Umfangs die It is envisaged that the connecting rod bearing over a part of its circumference
Steuerölnut enthält dergestalt, dass die Querbohrung im Bereich zwischen dem letzten Drittel der Kolbenauswärtsbewegung bis zum letzten Drittel der Kolbeneinsatzbewegung in Überdeckung mit der Steuerölnut steht. Steuerölnut contains such that the transverse bore is in the range between the last third of the piston outward movement to the last third of the piston insert movement in registration with the control oil groove.
Darüber hinaus ist aus der DE 10 2009 048 172 A1 ein Kolben für eine ein veränderbares Kompressionsverhältnis aufweisende Verbrennungskraftmaschine bekannt. Der Kolben umfasst ein erstes Kolbenteils sowie ein zweites Kolbenteil, welche unter Ausbildung zumindest einer ersten, mit einem Druckmedium, insbesondere einem Druckfluid, beaufschlagbaren und in ihrem Volumen veränderbaren Kammer relativ zueinander bewegbar gekoppelt sind. Dabei ist vorgesehen, dass zumindest eine schaltbare Moreover, DE 10 2009 048 172 A1 discloses a piston for an internal combustion engine having a variable compression ratio. The piston comprises a first piston part and a second piston part, which are coupled relative to each other while forming at least a first, with a pressure medium, in particular a pressurized fluid, acted upon and variable in volume chamber. It is provided that at least one switchable
Ventileinrichtung innenseitig an einem Kolbenhemd des Kolbens angeordnet ist, mittels welcher ein Volumen des Druckmediums in der ersten Kammer einstellbar ist. Valve means is disposed on the inside of a piston skirt of the piston, by means of which a volume of the pressure medium in the first chamber is adjustable.
Es hat sich gezeigt, dass derartige Verstellungen der Kolbenhöhe und damit des It has been shown that such adjustments of the piston height and thus of the
Kompressionsverhältnisses aufwändig sind. Compression ratio are complex.
Es ist Aufgabe der vorliegenden Erfindung, eine Kolbenanordnung für einen ein veränderbares Kompressionsverhältnis aufweisenden Brennraum bereitzustellen, mittels welcher eine einfache variable Einstellung des Kompressionsverhältnisses des It is an object of the present invention to provide a piston assembly for a variable compression ratio having combustion chamber, by means of which a simple variable adjustment of the compression ratio of
Brennraums ermöglicht ist. Combustion chamber is possible.
Diese Aufgabe wird durch eine Kolbenanordnung mit den Merkmalen des This object is achieved by a piston assembly having the features of
Patentanspruchs 1 gelöst. Vorteilhafte Ausgestaltungen mit zweckmäßigen und nichttrivialen Weiterbildungen der Erfindung sind in den übrigen Ansprüchen angegeben. Eine solche Kolbenanordnung für einen ein veränderbares Kompressionsverhältnis aufweisenden Brennraum, insbesondere Zylinder, einer insbesondere als Hubkolben- Verbrennungskraftmaschine ausgebildeten Verbrennungskraftmaschine, insbesondere eines Kraftwagens, umfasst einen Kolben sowie eine Einrichtung zum variablen Einstellen des dem Brennraum zugeordneten Kompressionsverhältnisses Patent claim 1 solved. Advantageous embodiments with expedient and non-trivial developments of the invention are specified in the remaining claims. Such a piston arrangement for a combustion chamber having a variable compression ratio, in particular a cylinder, of an internal combustion engine designed in particular as a reciprocating internal combustion engine, in particular of a motor vehicle, comprises a piston and a device for variably setting the compression ratio assigned to the combustion chamber
(Verdichtungsverhältnisses). Die Kolbenanordnung umfasst ferner einen Kolbenbolzen. Der Kolbenbolzen ist mit dem Kolben über jeweilige Verbindungsbereiche gekoppelt. Dabei ist der Kolbenbolzen beispielsweise in Aufnahmeöffnungen, insbesondere (Compression ratio). The piston assembly further includes a piston pin. The piston pin is coupled to the piston via respective connection areas. In this case, the piston pin, for example, in receiving openings, in particular
Durchgangsöffnungen, des Kolbens zumindest bereichsweise aufgenommen. Über den Kolbenbolzen ist der Kolben mit einem Pleuel der Verbrennungskraftmaschine Through openings, the piston received at least partially. About the piston pin is the piston with a connecting rod of the internal combustion engine
insbesondere gelenkig koppelbar. especially articulated coupling.
Der Kolben kann über den Kolbenbolzen und das Pleuel mit einer Kurbelwelle der Verbrennungskraftmaschine gelenkig gekoppelt werden, so dass translatorische The piston can be articulated via the piston pin and the connecting rod with a crankshaft of the internal combustion engine, so that translational
Bewegungen des Kolbens in dem Brennraum relativ zu diesem in eine rotatorische Bewegung der Kurbelwelle umgewandelt werden können. Movements of the piston in the combustion chamber can be converted relative to this in a rotational movement of the crankshaft.
Erfindungsgemäß umfasst die Einrichtung den Kolbenbolzen. Dabei weist der According to the invention, the device comprises the piston pin. It has the
Kolbenbolzen wenigstens ein bezogen auf den Verbindungsbereich des Kolbenbolzens exzentrisch angeordnetes Exzenterelement auf, über das der Kolben mit dem Pleuel koppelbar ist. Ist der Kolbenbolzen über das Exzenterelement mit dem Pleuel gekoppelt und wird der Kolbenbolzen um die Längsmittelachse des zumindest im Wesentlichen in Form eines geraden Kreiszylinders ausgebildeten Exzenterelements relativ zu dem Pleuel und um die Längsmittelachse des wenigstens einen, zumindest im Wesentlichen in Form eines geraden Kreiszylinders ausgebildeten Verbindungsbereichs des Kolbenbolzens relativ zu dem Kolben gedreht, so bewirkt diese Verdrehung des Kolbenbolzens relativ zu dem Pleuel und relativ zu dem Kolben infolge der exzentrischen Anordnung des Piston pin at least one with respect to the connection region of the piston pin eccentrically arranged eccentric element, via which the piston can be coupled to the connecting rod. If the piston pin is coupled to the connecting rod via the eccentric element and the piston pin becomes about the longitudinal central axis of the eccentric element formed at least substantially in the form of a right circular cylinder relative to the connecting rod and about the longitudinal center axis of at least one, at least substantially in the form of a straight circular cylinder connecting portion the piston pin is rotated relative to the piston, so causes this rotation of the piston pin relative to the connecting rod and relative to the piston due to the eccentric arrangement of the piston
Exzenterelements relativ zu dem Verbindungsbereich des Kolbenbolzens, dass der in dem Brennraum angeordnete Kolben in Längserstreckungsrichtung des Pleuels relativ zu diesem bewegt, insbesondere verschoben wird. Exzenterelements relative to the connecting portion of the piston pin, that the arranged in the combustion chamber piston in the longitudinal direction of the connecting rod relative to this moves, in particular is displaced.
Dies geht mit einer Veränderung des Abstands zwischen dem Kolben und der Drehachse der Kurbelwelle einher. Ferner geht dies mit der Veränderung des Abstands zwischen dem Kolben und einem Brennraumdach des Brennraums einher. Dadurch wird das Kompressionsverhältnis des Brennraums verändert. Diese Veränderung des This is accompanied by a change in the distance between the piston and the axis of rotation of the crankshaft. Furthermore, this is accompanied by the change in the distance between the piston and a combustion chamber roof of the combustion chamber. This changes the compression ratio of the combustion chamber. This change of
Kompressionsverhältnisses ist dabei auf besonders einfache und damit kosten- und bauraumgünstige Weise realisiert. Darüber hinaus ist es mittels der erfindungsgemäßen Kolbenanordnung möglich, das Kompressionsverhältnis bedarfsgerecht einzustellen und an unterschiedliche Compression ratio is realized in a particularly simple and thus cost and space-saving manner. Moreover, it is possible by means of the piston assembly according to the invention to adjust the compression ratio as needed and to different
Betriebspunkte der Verbrennungskraftmaschine einstellen zu können. So kann die Verbrennungskraftmaschine effizient und mit einem nur geringen Energieverbrauch, insbesondere Kraftstoffverbrauch, betrieben werden. Die Kolbenanordnung weist ferner nicht nur eine sehr hohe Kompaktheit sondern auch einen sehr hohen Gleichteilanteil im Vergleich zu einer herkömmlichen Kolbenanordnung, welche keine Verstellung des Kompressionsverhältnisses ermöglicht, auf. Dies kommt den geringen Kosten zugute. To be able to set operating points of the internal combustion engine. Thus, the internal combustion engine can be operated efficiently and with only low energy consumption, in particular fuel consumption. The piston assembly further has not only a very high compactness but also a very high equal part ratio compared to a conventional piston assembly, which allows no adjustment of the compression ratio on. This benefits the low cost.
In einer vorteilhaften Ausführungsform der Erfindung umfasst die Einrichtung wenigstens ein Steuerelement. Das Steuerelement ist dabei am Kolben relativ zum Kolben und relativ zum Kolbenbolzen zwischen zumindest zwei Stellungen bewegbar. Insbesondere ist das Steuerelement schräg oder senkrecht zur Längserstreckung des Kolbenbolzens verschiebbar, weswegen das Steuerelement auch als Steuerschieber bezeichnet wird. Mittels des Steuerelements ist eine Drehung des Kolbenbolzens relativ zu dem Kolben bewirkbar oder verhinderbar ist. In an advantageous embodiment of the invention, the device comprises at least one control element. The control is movable on the piston relative to the piston and relative to the piston pin between at least two positions. In particular, the control element is displaceable obliquely or perpendicular to the longitudinal extent of the piston pin, which is why the control is also referred to as a control slide. By means of the control element, a rotation of the piston pin relative to the piston can be effected or prevented.
Mit anderen Worten, befindet sich das Steuerelement in der ersten Stellung, so bewirkt das Steuerelement je nach Drehstellung des Kolbenbolzens eine Verriegelung des Kolbenbolzens oder eine Drehung des Kolbenbolzens relativ zum Kolben. So kann wahlweise das Kompressionsverhältnis beibehalten oder verändert werden In other words, is the control in the first position, the control causes depending on the rotational position of the piston pin locking of the piston pin or rotation of the piston pin relative to the piston. So either the compression ratio can be maintained or changed
Die Drehung des Kolbenbolzens relativ zum Kolben und damit die Einstellung bzw. die Verstellung des Kompressionsverhältnisses erfolgt bei der erfindungsgemäßen The rotation of the piston pin relative to the piston and thus the adjustment or the adjustment of the compression ratio takes place in the inventive
Kolbenanordnung bevorzugt infolge von Flieh- oder Massenkräften des sich in dem Brennraum bewegenden Kolbens und/oder infolge von in dem Brennraum herrschenden und auf den Kolben wirkenden Druckkräften. Dadurch ist eine einfache Verstellung des Kompressionsverhältnisses ohne zusätzliche aktive Stellelemente geschaffen, was den Bauraumbedarf der Kolbenanordnung sowie ihre Kosten gering hält. Piston arrangement preferably due to centrifugal or inertial forces of the moving piston in the combustion chamber and / or due to prevailing in the combustion chamber and acting on the piston pressure forces. As a result, a simple adjustment of the compression ratio is created without additional active control elements, which keeps the space requirement of the piston assembly and their costs low.
Weitere Vorteile, Merkmale und Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung eines bevorzugten Ausführungsbeispiels sowie anhand der Zeichnung. Die vorstehend in der Beschreibung genannten Merkmale und Further advantages, features and details of the invention will become apparent from the following description of a preferred embodiment and from the drawing. The features mentioned above in the description and
Merkmalskombinationen sowie die nachfolgend in der Figurenbeschreibung genannten und/oder in den Figuren alleine gezeigten Merkmale und Merkmalskombinationen sind nicht nur in der jeweils angegebenen Kombination, sondern auch in anderen Kombinationen oder in Alleinstellung verwendbar, ohne den Rahmen der Erfindung zu verlassen. Feature combinations as well as the features and feature combinations mentioned below in the description of the figures and / or shown alone in the figures are not only in the respectively indicated combination but also in others Combinations or alone, without departing from the scope of the invention.
Die Zeichnung zeigt in: The drawing shows in:
Fig. 1 eine schematische Perspektivansicht eines Kolbenbolzens mit einem Fig. 1 is a schematic perspective view of a piston pin with a
Sperrelement und einer Kolbenbolzenbuchse einer in der Fig. 3 gezeigten Kolbenanordnung;  Locking element and a piston pin bushing of a piston assembly shown in Figure 3;
Fig. 2 eine schematische Perspektivansicht des Kolbenbolzens gemäß Fig. 1 ; FIG. 2 shows a schematic perspective view of the piston pin according to FIG. 1; FIG.
Fig. 3 ausschnittsweise eine schematische Seitenansicht einer Kolbenanordnung für einen ein veränderbares Kompressionsverhältnis aufweisenden Fig. 3 shows a detail of a schematic side view of a piston assembly for a variable compression ratio having
Zylinder einer Hubkolben-Verbrennungskraftmaschine, mit einem transparent dargestellten Kolben, der über den Kolbenbolzen gemäß den Fig. 1 und 2 mit einem Pleuel der Kolbenanordnung gelenkig gekoppelt ist, wobei die Kolbenanordnung eine Einrichtung umfasst, mittels welcher das Kompressionsverhältnis einstellbar ist;  Cylinder of a reciprocating internal combustion engine, with a piston shown in transparent, which is articulated via the piston pin of Figures 1 and 2 with a connecting rod of the piston assembly, wherein the piston assembly comprises means by which the compression ratio is adjustable.
Fig. 4 eine schematische Seitenansicht des Kolbens gemäß Fig. 3, wobei sich ein Steuerelement der Einrichtung in seiner ersten Stellung befindet; FIG. 4 is a schematic side view of the piston of FIG. 3 with a control of the device in its first position; FIG.
Fig. 5 eine weitere schematische Seitenansicht des Kolbens gemäß Fig. 4; FIG. 5 shows a further schematic side view of the piston according to FIG. 4; FIG.
Fig. 6 eine weitere schematische Seitenansicht des Kolbens gemäß den Fig. 4 und 5, wobei sich das Steuerelement in seiner zweiten Stellung befindet; Figure 6 is another schematic side view of the piston of Figures 4 and 5 with the control in its second position;
Fig. 7 eine weitere schematische Seitenansicht des Kolbens gemäß Fig. 6; FIG. 7 shows a further schematic side view of the piston according to FIG. 6; FIG.
Fig. 8a - e jeweils eine schematische Seitenansicht der Kolbenanordnung gemäß Fig. 8a-e each show a schematic side view of the piston arrangement according to FIG.
3 während einer Hubbewegung in dem Zylinder, wobei das Kompressionsverhältnis verstellt wird;  3 during a lifting movement in the cylinder, wherein the compression ratio is adjusted;
Fig. 9 ausschnittsweise eine schematische Perspektivansicht des Kolbens 9 shows a detail of a schematic perspective view of the piston
gemäß Fig. 3; Fig. 10 ausschnittsweise eine weiteres schematische Perspektivansicht des Kolbens gemäß Fig. 9; as shown in FIG. 3; FIG. 10 shows a detail of a further schematic perspective view of the piston according to FIG. 9; FIG.
Fig. 11 eine schematische Perspektivansicht des Kolbens gemäß den Fig. 9 und 11 is a schematic perspective view of the piston according to FIGS. 9 and
10, wobei der Kolben transparent dargestellt ist; und  10, wherein the piston is shown transparent; and
Fig. 12 ausschnittsweise eine schematische Perspektivansicht des Kolbens 12 shows a detail of a schematic perspective view of the piston
gemäß Fig. 11 , wobei der Kolben transparent dargestellt ist.  as shown in FIG. 11, wherein the piston is shown transparent.
Die Fig. 1 und 2 zeigen einen Kolbenbolzen 10 einer Kolbenanordnung 12 (Fig. 3), über welchen ein Kolben 14 der Kolbenanordnung mit einem Pleuel 16 einer als Hubkolben- Verbrennungskraftmaschine ausgebildeten Verbrennungskraftmaschine gelenkig zu koppeln ist. Wie in Zusammenschau mit den Fig. 8a-e zu erkennen ist, umfasst die Verbrennungskraftmaschine eine Kurbelwelle 18, welche in einem Kurbelgehäuse um eine Drehachse 20 relativ zu dem Kurbelgehäuse drehbar gelagert ist. Die Kurbelwelle 18 umfasst einen Hubzapfen, an dem das Pleuel 16 über ein großes Pleuelauge gelenkig gelagert ist. Das Pleuel 16 umfasst ferner ein kleines Pleuelauge, in welchem der Kolbenbolzen 10 bereichsweise aufgenommen ist. 1 and 2 show a piston pin 10 of a piston assembly 12 (Fig. 3), via which a piston 14 of the piston assembly with a connecting rod 16 is designed to be designed as a reciprocating internal combustion engine engine articulated. As can be seen in conjunction with FIGS. 8a-e, the internal combustion engine comprises a crankshaft 18 which is rotatably mounted in a crankcase about an axis of rotation 20 relative to the crankcase. The crankshaft 18 includes a crank pin on which the connecting rod 16 is articulated via a large connecting rod. The connecting rod 16 further comprises a small connecting rod eye, in which the piston pin 10 is partially received.
Der Kolbenbolzen 10 ist mit dem Kolben 14 über jeweilige Verbindungsbereiche 22 gekoppelt. Die Verbindungsbereiche 22 des Kolbenbolzens 10 sind durch eine The piston pin 10 is coupled to the piston 14 via respective connection portions 22. The connecting portions 22 of the piston pin 10 are through a
außenumfangsseitige Mantelfläche des Kolbenbolzens 10 gebildet, wobei die Outside circumferential side surface of the piston pin 10 is formed, wherein the
Verbindungsbereiche zumindest im Wesentlichen in Form eines geraden Kreiszylinders ausgebildet sind. Zum Koppeln des Kolbenbolzens 10 mit dem Kolben 14 sind die Verbindungsbereiche 22 zumindest bereichsweise in jeweiligen, vorliegend als Connecting regions are formed at least substantially in the form of a right circular cylinder. For coupling the piston pin 10 with the piston 14, the connecting portions 22 at least partially in each case, in this case as
Durchgangsöffnungen ausgebildeten Aufnahmeöffnungen 26 des Kolbens14 Through openings formed receiving openings 26 of the piston 14
aufgenommen. added.
Über den - bezogen auf die Bildebene der Fig. 2 - rechten Verbindungsbereich 22 des Kolbenbolzens 10 ist der Kolbenbolzen 10 mittelbar mit dem Kolben 14 verbunden. Wie anhand der Fig. 1 erkennbar ist, umfasst die Kolbenanordnung 12 eine About the - relative to the image plane of Fig. 2 - right connecting portion 22 of the piston pin 10, the piston pin 10 is indirectly connected to the piston 14. As can be seen with reference to FIG. 1, the piston assembly 12 comprises a
Kolbenbolzenbuchse 28, in welcher der rechte Verbindungsbereich 22 des Kolbenbolzens 10 angeordnet ist. Die Kolbenbolzenbuchse 28 in der korrespondierenden Piston pin bushing 28, in which the right connection portion 22 of the piston pin 10 is arranged. The piston pin bushing 28 in the corresponding
Aufnahmeöffnung 26 aufgenommen. Die Kolbenbolzenbuchse 28 fungiert dabei als Anschlag für den Kolbenbolzen 10 und ermöglicht eine einfache Montage des Receiving opening 26 was added. The piston pin bushing 28 acts as Stop for the piston pin 10 and allows easy mounting of the
Kolbenbolzens 10 am bzw. im Kolben 14. Piston pin 10 on or in the piston 14th
Der Kolbenbolzen 10 weist ein Exzenterelement 23 auf, welches zumindest im  The piston pin 10 has an eccentric element 23, which at least in
Wesentlichen in Form eines geraden Kreiszylinders ausgebildet und bezogen auf die Verbindungsbereiche 22 exzentrisch angeordnet ist. Dies bedeutet, dass die Essentially designed in the form of a straight circular cylinder and is arranged eccentrically relative to the connecting portions 22. This means that the
Längsmittelachse des Exzenterelements senkrecht zu den jeweiligen, koaxial zueinander angeordneten Längsmittelachsen der Verbindungsbereiche 22 versetzt ist. Über das Exzenterelement 23, welches in dem kleinen Pleuelauge des Pleuels 16 zumindest bereichsweise aufgenommen ist, ist der Kolbenbolzen 10 mit dem Pleuel 16 gelenkig verbunden. Somit ist der der Kolben 14 gelenkig mit dem Pleuel 16 gekoppelt. Infolge dieser gelenkigen Kopplung können translatorische Relativbewegungen des in einem Zylinder der Verbrennungskraftmaschine aufgenommenen Kolben s14 relativ zu dem Zylinder in eine rotatorische Bewegung der Kurbelwelle 18 um die Drehachse Longitudinal axis of the eccentric element is offset perpendicular to the respective coaxial with each other arranged longitudinal central axes of the connecting portions 22. About the eccentric element 23, which is at least partially received in the small connecting rod eye of the connecting rod 16, the piston pin 10 is pivotally connected to the connecting rod 16. Thus, the piston 14 is pivotally coupled to the connecting rod 16. As a result of this articulated coupling, translational relative movements of the piston s14 received in a cylinder of the internal combustion engine relative to the cylinder can result in a rotational movement of the crankshaft 18 about the axis of rotation
umgewandelt werden. being transformed.
Wie insbesondere der Fig. 2 zu entnehmen ist, weist der eine durch einen Richtungspfeil 30 angedeutete Längserstreckung aufweisenden Kolbenbolzen 10 eine Aufnahmeöffnung 32 auf, welche beispielsweise als Durchgangsöffnung ausgebildet ist. Die As can be seen in particular from FIG. 2, the piston pin 10, which has a longitudinal extent indicated by a directional arrow 30, has a receiving opening 32, which is designed, for example, as a passage opening. The
Aufnahmeöffnung 32 erstreckt sich dabei zumindest im Wesentlichen senkrecht zur Längserstreckung (Richtungspfeil 30) des Kolbenbolzens 10. Receiving opening 32 extends at least substantially perpendicular to the longitudinal extent (direction arrow 30) of the piston pin 10th
In der Aufnahmeöffnung 32 ist ein Sperrelement in Form eines Verriegelungsbolzens 34 aufgenommen. Der Verriegelungsbolzen 34 ist in der Aufnahmeöffnung 32 geführt senkrecht zur Längserstreckung des Kolbenbolzens 10 relativ zum Kolbenbolzen 10 verschiebbar. In Zusammenschau mit der Fig. 3 ist es ersichtlich, dass zumindest der Kolbenbolzen 10 und der Verriegelungsbolzen 34 einer Einrichtung 36 der In the receiving opening 32, a locking element in the form of a locking bolt 34 is received. The locking pin 34 is guided in the receiving opening 32 perpendicular to the longitudinal extent of the piston pin 10 relative to the piston pin 10 slidably. In conjunction with FIG. 3, it can be seen that at least the piston pin 10 and the locking pin 34 of a device 36 of
Kolbenanordnung 12 zugeordnet sind. Mittels der Einrichtung 36 ist es möglich, das Kompressionsverhältnis des der Kolbenanordnung 12 zugeordneten Zylinders der Verbrennungskraftmaschine variabel einstellen zu können. Piston assembly 12 are assigned. By means of the device 36, it is possible to adjust the compression ratio of the piston assembly 12 associated cylinder of the internal combustion engine variable.
Dazu umfasst die Einrichtung 36 auch ein Steuerelement in Form eines Steuerschiebers 38. Der Steuerschieber 38 ist an dem Kolben 14 gehalten und relativ zu dem Kolben 14 sowie relativ zu dem Kolbenbolzen 10 zwischen zwei Stellungen verschiebbar. Der Steuerschieber 38 ist dabei ausschließlich zwischen den beiden Stellungen verschiebbar. Bei dem Steuerschieber 38 handelt es sich somit um einen sogenannten bistabilen Steuerkolben. In einer insbesondere in den Fig. 4 und 5 gezeigten ersten Stellung des Steuerschiebers 38 ist dieser mittels eines ersten Magneten gehalten. Der erste Magnet ist dabei an dem Kolben 14 angeordnet. In der insbesondere in den Fig. 3, 6 und 7 gezeigten zweiten Stellung ist der Steuerschieber 38 mittels eines zweiten Magneten gehalten, wobei auch der zweite Magnet an dem Kolben 14 gehalten ist. Insbesondere in der Fig. 9 ist eine Hülse 44 der Einrichtung 36 zu erkennen, in welcher der Steuerschieber 38 verschiebbar aufgenommen ist. For this purpose, the device 36 also includes a control in the form of a spool 38. The spool 38 is held on the piston 14 and displaceable relative to the piston 14 and relative to the piston pin 10 between two positions. The spool 38 is displaceable only between the two positions. In the spool 38 is thus a so-called bistable control piston. In a first position, shown in particular in FIGS. 4 and 5, of the control slide 38, the latter is held by means of a first magnet. The first magnet is arranged on the piston 14. In the second position shown in particular in FIGS. 3, 6 and 7, the spool 38 is held by means of a second magnet, wherein also the second magnet is held on the piston 14. In particular, in Fig. 9, a sleeve 44 of the device 36 can be seen, in which the spool 38 is slidably received.
Durch Verschieben des Steuerschiebers 38 zumindest im Wesentlichen senkrecht zur Längserstreckung des Kolbenbolzens 10 zwischen seinen zwei Stellungen kann eine Bewegung des Verriegelungsbolzens 34 zwischen einer Freigabestellung und einer Sperrstellung des Verriegelungsbolzens 34 bewirkt oder verhindert bzw. verriegelt werden. Das Verschieben des Steuerschiebers 38 zwischen seinen beiden Stellungen kann wiederum mittels eines Stellglieds, beispielsweise eines Elektromagneten oder mittels Öldruck erfolgen. Vorliegend wird der Steuerschieber 38 mittels Öldruck verschoben. By moving the spool 38 at least substantially perpendicular to the longitudinal extension of the piston pin 10 between its two positions, a movement of the locking bolt 34 between a release position and a locking position of the locking bolt 34 can be effected or prevented or locked. The displacement of the spool 38 between its two positions can in turn be done by means of an actuator, such as an electromagnet or by means of oil pressure. In the present case, the spool 38 is moved by means of oil pressure.
Wie anhand der Fig. 9 bis 12 erkennbar ist, weist der Kolben 14 in seinem Kolbenhemd 40 zwei einander gegenüberliegende Durchgangsöffnungen 42 auf. Die As can be seen with reference to FIGS. 9 to 12, the piston 14 in its piston skirt 40 has two passage openings 42 lying opposite one another. The
Durchgangsöffnungen 42 durchsetzen das Kolbenhemd 40 und damit eine Through holes 42 pass through the piston skirt 40 and thus one
außenumfangseitige Mantelfläche des Kolbens 14 vollständig. An die Outer circumferential side surface of the piston 14 completely. To the
Durchgangsöffnungen schließen sich Nuten 43 an, welche in axialer Richtung des Kolbens 14 verlaufen und welche mit den Durchgangsöffnungen 42 verbunden sind. Mit anderen Worten münden die Nuten 43 in die Durchgangsöffnungen. Through openings close to grooves 43, which extend in the axial direction of the piston 14 and which are connected to the through holes 42. In other words, the grooves 43 open into the passage openings.
Die Verstellung des Kompressionsverhältnisses ist insbesondere anhand der Fig. 8a - e zu erkennen. Über ein Beaufschlagungselement 46, beispielsweise eine Ölspritzdüse, wird Schmieröl der Verbrennungskraftmaschine in die Nuten 43 und in die The adjustment of the compression ratio can be seen in particular with reference to FIGS. 8a-e. About a biasing member 46, for example, an oil spray nozzle, lubricating oil of the internal combustion engine in the grooves 43 and in the
Durchgangsöffnungen 42 eingespritzt, während sich der Kolben 14 im Zylinder bewegt. Dadurch wird der Steuerschieber 38 von einer seiner Stirnseiten her mit Schmieröl beaufschlagt, insbesondere druckbeaufschlagt. Die Ansteuerung mit dem Schmieröl erfolgt dabei über 150° Kurbelwinkel der Kurbelwelle 18, wobei die Beaufschlagung, d.h. die Ansteuerungen des Steuerschiebers 38 bei einer Drehstellung der Kurbelwelle 8 gemäß Fig. 8b beginnt und bei einer weiteren Drehstellung der Kurbelwelle 18 gemäß Fig. 8e endet. Die der jeweils mit Schmieröl beaufschlagten Stirnseite gegenüberliegende andere entsprechend Stirnseite des Steuerschiebers 38 wird nicht mit Schmieröl beaufschlagt, was beispielsweise durch gegenseitig verriegelte Schaltventile sichergestellt ist. Durch Beaufschlagen der einen Stirnseite des Steuerschiebers 38 wird der Steuerschieber 38 in Richtung der anderen Stirnseite verschoben, welche nicht mit Schmieröl beaufschlagt wird. In den Fig. 8a-e ist auch eine Ölspritzdüse 47 erkennbar, mittels welcher der Kolben 14 mit Schmieröl bespritzt und somit gekühlt werden kann. Through holes 42 injected while the piston 14 moves in the cylinder. As a result, the spool 38 is acted upon by one of its end faces with lubricating oil, in particular pressurized. The control with the lubricating oil takes place over 150 ° crank angle of the crankshaft 18, wherein the action, ie the activations of the spool 38 at a rotational position of the crankshaft 8 as shown in FIG. 8b begins and ends at a further rotational position of the crankshaft 18 of FIG. 8e. The each acted upon with lubricating oil end opposite other corresponding end face of the spool 38 is not acted upon by lubricating oil, which, for example, by mutually locked switching valves is ensured. By applying the one end face of the spool 38, the spool 38 is displaced in the direction of the other end face, which is not acted upon by lubricating oil. In FIGS. 8a-e an oil spray nozzle 47 can also be seen, by means of which the piston 14 is sprayed with lubricating oil and thus can be cooled.
Das Beaufschlagungselement 46 ist dabei in der Zylinderlaufbahn des Zylinders angeordnet. Mit anderen Worten erfolgt die Beaufschlagung bzw. die Ansteuerung des Steuerschiebers 38 von außerhalb des Kolbens 14 über die Zylinderlaufbahn und somit von außerhalb des Kolbens 14 her. The biasing element 46 is arranged in the cylinder bore of the cylinder. In other words, the application or the control of the spool 38 takes place from outside the piston 14 via the cylinder bore and thus from outside the piston 14 ago.
Die Nuten 43, welche auch als Langlöcher ausgebildet sein können dienen dabei zur Aufnahme des Schmieröls über die Drehung der Kurbelwelle 18 und damit über die translatorische Bewegung des Kolbens 14 in dem Zylinder hinweg und leiten das Schmieröl zu den Durchgangsöffnungen 42 und darüber zu dem Steuerschieber 38. The grooves 43, which may also be formed as elongated holes serve to receive the lubricating oil via the rotation of the crankshaft 18 and thus over the translational movement of the piston 14 in the cylinder and guide the lubricating oil to the through holes 42 and over to the spool 38th ,
Der Steuerschieber 38 dient dabei zur sogenannten Vorsteuerung von Schmieröl der Verbrennungskraftmaschine, mittels welchem der Verriegelungsbolzen 34 zwischen wenigstens einer Freigabestellung und wenigstens einer Sperrstellung des The spool 38 serves for the so-called pilot control of lubricating oil of the internal combustion engine, by means of which the locking bolt 34 between at least one release position and at least one locking position of the
Verriegelungsbolzens 34 bewegt wird. Locking bolt 34 is moved.
Das Schmieröl zum Verstellen des Verriegelungsbolzens 34 wird über Lagerstellen der Kurbelwelle 18 an dem Kurbelgehäuse an die Kurbelwelle 18 und über entsprechende Kanäle weiter an das Pleuel 16 übergeben. Von dem Pleuel 16 strömt das Schmieröl zu einer außenumfangseitig in Umfangsrichtung vollständig umlaufenden ersten Nut 48 des Kolbenbolzens 10. Von der ersten Nut 48 strömt das Schmieröl über wenigstens einen entsprechenden Verbindungskanal zu einer zweiten Nut 50 des Kolbenbolzens 10, welche in Umfangsrichtung des Kolbenbolzens 10 außenumfangseitig ebenso vollständig umlaufend verläuft. Von der zweiten Nut 50 kann das Schmieröl an entsprechende Kanäle 56, 58 in dem Kolben 14 überströmen. Je nach Stellung des Steuerschiebers 38 kann das Schmieröl den ersten Kanal 56 oder den zweiten Kanal 58 durchströmen, zu dem Verriegelungsbolzen 34 gelangen, und diesen bewegen. Die Kanäle 56, 58 sind dabei direkt in den Kolben 14 integriert, das heißt durch Wandungen des Kolbens 14 gebildet bzw. begrenzt. Der Verbindungskanal des Kolbenbolzens 10 zur fluidischen Verbindung der Nuten 48, 50 mündet vorliegend nach außen, so dass überschüssiges Schmieröl zur Kühlung des Kolbens 14 verwendet werden kann. Die Fig. 5 zeigt den Steuerschieber 38 in seiner ersten Stellung. Der Verriegelungsbolzen 34 befindet sich zunächst in seiner Sperrstellung, in der er auf Seiten der - bezogen auf die Bildebene der Fig. 5 - rechten Nut 43 mit dem Kolben 14 zusammenwirkt und eine Drehung des Kolbenbolzens 10 relativ zu dem Kolben 14 verhindert. Das heißt, dass der Kolbenbolzen 10 lediglich im kleinen Pleuelauge des Pleuels 16 um die Längsmittelachse des Exzenterelements 23 relativ zum Pleuel 16 gedreht werden kann, so dass der Kolben 14 über den Kolbenbolzen 10 gelenkig mit dem Pleuel 16 gekoppelt ist. Dazu ist der Verriegelungsbolzen 34 bereichsweise in der Aufnahmeöffnung 32 und bereichsweise in einer auf Seiten der rechten Nut 43 angeordneten ersten Aufnahme im Kolben 14 aufgenommen. The lubricating oil for adjusting the locking bolt 34 is transferred via bearings of the crankshaft 18 on the crankcase to the crankshaft 18 and via appropriate channels on to the connecting rod 16. From the connecting rod 16, the lubricating oil flows to an outer circumferential side circumferentially completely circumferential first groove 48 of the piston pin 10. From the first groove 48, the lubricating oil flows through at least one corresponding connecting channel to a second groove 50 of the piston pin 10, which in the circumferential direction of the piston pin 10 outside circumference just as completely revolving. From the second groove 50, the lubricating oil can flow to corresponding channels 56, 58 in the piston 14. Depending on the position of the spool 38, the lubricating oil can flow through the first channel 56 or the second channel 58, get to the locking pin 34, and move it. The channels 56, 58 are integrated directly into the piston 14, that is formed by walls of the piston 14 and limited. The connecting channel of the piston pin 10 for the fluidic connection of the grooves 48, 50 opens in the present case to the outside, so that excess lubricating oil can be used for cooling the piston 14. Fig. 5 shows the spool 38 in its first position. The locking bolt 34 is initially in its blocking position, in which it on the side of - relative to the image plane of FIG. 5 - right groove 43 cooperates with the piston 14 and prevents rotation of the piston pin 10 relative to the piston 14. This means that the piston pin 10 can only be rotated in the small connecting rod eye of the connecting rod 16 about the longitudinal central axis of the eccentric element 23 relative to the connecting rod 16, so that the piston 14 is pivotally coupled via the piston pin 10 to the connecting rod 16. For this purpose, the locking pin 34 is partially received in the receiving opening 32 and partially in a arranged on the side of the right groove 43 first receptacle in the piston 14.
In der ersten Stellung des Steuerschiebers 38 kann der erste Kanal 56 im Kolben 14 mit Schmieröl versorgt werden. Eine Versorgung des zweiten Kanals 58 im Kolben 14 mit Schmieröl ist durch den Steuerschieber 38 verhindert. Wie der Fig. 5 zu entnehmen ist, strömt das Schmieröl in der ersten Stellung des Steuerschiebers 38 vom Pleuel 16 über die Nuten 48, 50 in den rechten ersten Kanal 56 und von dort weiter zu einer in dieser Stellung des Kolbenbolzens 10 rechten ersten Stirnseite 52 des Verriegelungsbolzens 34. Dies bedeutet, dass die erste Stirnseite 52 von dem Schmieröl beaufschlagt wird. Das Schmieröl drückt nun den Verriegelungsbolzen 34 in radialer Richtung des Kolbenbolzens 10 in die Aufnahmeöffnung 32 hinein und so von seiner Sperrstellung in seine In the first position of the spool 38, the first channel 56 in the piston 14 can be supplied with lubricating oil. A supply of the second channel 58 in the piston 14 with lubricating oil is prevented by the spool 38. 5, the lubricating oil flows in the first position of the spool 38 from the connecting rod 16 via the grooves 48, 50 in the right first channel 56 and from there on to a right in this position of the piston pin 10 first end side 52nd of the locking bolt 34. This means that the first end face 52 is acted upon by the lubricating oil. The lubricating oil now pushes the locking pin 34 in the radial direction of the piston pin 10 in the receiving opening 32 and so from its blocking position in his
Freigabestellung. Release position.
In der Aufnahmeöffnung 32 kann ein Federelement angeordnet sein, über das der Verriegelungsbolzen 34 an dem Kolbenbolzen 10 unter Federkraftbeaufschlagung abgestützt ist. Die Federkraft ist dabei in radialer Richtung des Kolbenbolzens 10 nach außen gerichtet. Das heißt, dass dann das Schmieröl den Verriegelungsbolzens 34 entgegen der Federkraft in die Aufnahmeöffnung 32 hinein- und aus der ersten Aufnahme herausdrückt. Ist der Verriegelungsbolzen 34 vollständig aus der ersten Aufnahme bewegt, so befindet er sich in seiner Freigabestellung. In der Freigabestellung kann der Verriegelungsbolzen 34 eine Relativdrehung des Kolbenbolzens 10 zum Kolben 14 nicht mehr verhindern. Der Kolbenbolzen 10 kann dann im kleinen Pleuelauge des Pleuels 16 um die Längsmittelachse des Exzenterelements 23 relativ zum Pleuel 16 sowie in den Aufnahmeöffnungen 26 um die jeweiligen Längsmittelachsen der Verbindungsbereiche 22 relativ zum Kolben 14 gedreht werden. In the receiving opening 32, a spring element may be arranged, via which the locking pin 34 is supported on the piston pin 10 under Federkraftbeaufschlagung. The spring force is directed in the radial direction of the piston pin 10 to the outside. This means that then the lubricating oil pushes the locking bolt 34 against the spring force into the receiving opening 32 and out of the first receptacle. If the locking pin 34 is completely moved out of the first receptacle, it is in its release position. In the release position, the locking bolt 34 can no longer prevent a relative rotation of the piston pin 10 to the piston 14. The piston pin 10 can then be rotated in the small connecting rod eye of the connecting rod 16 about the longitudinal center axis of the eccentric element 23 relative to the connecting rod 16 and in the receiving openings 26 about the respective longitudinal center axes of the connecting portions 22 relative to the piston 14.
Eine solche Relativdrehung wird beispielsweise durch Massen- und/oder Flieh- und/oder in dem Zylinder herrschende und auf den Kolben 14 wirkende Druckkräfte infolge der exzentrischen Anordnung des Exzenterelements 23 relativ zu den VerbindungsbereichenSuch a relative rotation, for example, by mass and / or centrifugal and / or prevailing in the cylinder and acting on the piston 14 compressive forces due to eccentric arrangement of the eccentric member 23 relative to the connecting portions
22 bewirkt. Beim Verdichtungstakt des Kolbens 14 wird der Kolben 14 in Richtung der Drehachse 20 gedrückt. Aufgrund der exzentrischen Anordnung des Exzenterelements22 causes. During the compression stroke of the piston 14, the piston 14 is pressed in the direction of the axis of rotation 20. Due to the eccentric arrangement of the eccentric element
23 relativ zu den Verbindungsbereichen 22 wird der Abstand zwischen dem Kolben 14 und der Drehachse verkleinert bzw. der Abstand zwischen dem Kolben 14 und einem Brennraumdach des Zylinders vergrößert, wodurch das Kompressionsverhältnis (ε) verringert wird. Während des Ansaugtrakts wird der Abstand zwischen dem Kolben 14 und der Drehachse 20 vergrößert, indem der Kolben 14 von der Drehachse weggezogen wird. Dadurch wird ein demgegenüber höheres Kompressionsverhältnis eingestellt. Das Drücken und Ziehen des Kolbens 14 bewirkt dabei über seine Kopplung mit dem 23 relative to the connecting portions 22, the distance between the piston 14 and the rotation axis is reduced or increases the distance between the piston 14 and a combustion chamber roof of the cylinder, whereby the compression ratio (ε) is reduced. During the intake tract, the distance between the piston 14 and the rotation axis 20 is increased by pulling the piston 14 away from the rotation axis. This sets a higher compression ratio. The pressing and pulling of the piston 14 causes via its coupling with the
Kolbenbolzen 10 das Drehen des Kolbenbolzens 10 relativ zum Kolben 14 bzw. relativ zum Pleuel 16, wenn sich der Verriegelungsbolzen 34 in seiner Freigabestellung befindet. Piston pin 10, the rotation of the piston pin 10 relative to the piston 14 and relative to the connecting rod 16 when the locking pin 34 is in its release position.
Vorliegend dreht sich der Kolbenbolzen 10 um 180 Grad - bezogen auf die Bildebene der Fig. 5 - nach links, also entgegen dem Uhrzeigersinn. Ist die Aufnahmeöffnung 32 als Durchgangsöffnung ausgebildet, so wirkt dann das Schmieröl über den ersten rechten Kanal 56 auf eine der ersten Stirnseite 52 abgewandte zweite Stirnseite 54 des In the present case, the piston pin 10 rotates by 180 degrees - with respect to the image plane of FIG. 5 - to the left, ie counterclockwise. If the receiving opening 32 is formed as a passage opening, the lubricating oil then acts via the first right channel 56 on a second end face 54 of the first end 52 remote from the first end 52
Verriegelungsbolzens 34 und drückt den Verriegelungsbolzen 34 zusammen mit der Federkraft des Federelements in radialer Richtung nach außen aus der Aufnahmeöffnung 32 hinaus. Der Verriegelungsbolzen 34 wird somit von seiner Freigabestellung wieder in seine Sperrstellung bewegt. Dann wirkt der Verriegelungsbolzen 34 auf Seiten der - bezogen auf die Bildebene der Fig. 5 - linken Nut 43 mit dem Kolben 14 zusammen, so dass dann wieder ein Verdrehen des Kolbenbolzens 10 relativ zum Kolben 14 verhindert ist. Der Kolbenbolzen 10 ist verriegelt. Locking bolt 34 and pushes the locking pin 34 together with the spring force of the spring element in the radial direction outwardly of the receiving opening 32 addition. The locking pin 34 is thus moved from its release position back to its blocking position. Then the locking pin 34 acts on the side of the - related to the image plane of Fig. 5 - left groove 43 with the piston 14 together, so that then again a rotation of the piston pin 10 is prevented relative to the piston 14. The piston pin 10 is locked.
Dazu ist der Verriegelungsbolzen 34 zum Beispiel bereichsweise in der Aufnahmeöffnung 32 und bereichsweise in einer auf Seiten der linken Nut 43 angeordneten zweiten For this purpose, the locking bolt 34 is, for example, partially in the receiving opening 32 and partially arranged in a side of the left groove 43 second
Aufnahme im Kolben 14 aufgenommen. Das Schmieröl wird nicht nur zum bewegen des Verriegelungsbolzens 34 sondern auch zum Arretieren dieses in der Sperrstellung genutzt und erfüllt somit auch eine Arretierungsfunktion. Recording recorded in the piston 14. The lubricating oil is not only used to move the locking bolt 34 but also to lock this in the locked position and thus also fulfills a locking function.
Wird dann - davon ausgehend - der Steuerschieber 38 in seine zweite Stellung bewegt (verschoben), wird die Versorgung des rechten ersten Kanals 56 mit Schmieröl beendet. Dann wird der linke zweite Kanal 58 mit Schmieröl versorgt. Das Schmieröl kann dann von dem Pleuel 16 über die Nuten 48, 50 in den linken zweiten Kanal 58 und von dort weiter zu der in der jetzigen Stellung des Kolbenbolzens linken ersten Stirnseite 52 strömen. Dies bedeutet, dass nun wieder die erste Stirnseite 52 (nicht mehr die zweite Stirnseite 54) mit Schmieröl beaufschlagt wird. Das Schmieröl drückt den If the control slide 38 is then moved (shifted) to its second position (starting from this), the supply of the right-hand first channel 56 is ended with lubricating oil. Then, the left second passage 58 is supplied with lubricating oil. The lubricating oil can then flow from the connecting rod 16 via the grooves 48, 50 in the left second channel 58 and from there to the left in the current position of the piston pin first end face 52. This means that now again the first end face 52 (not the second Face 54) is acted upon with lubricating oil. The lubricating oil pushes the
Verriegelungsbolzen 34 wieder in seine Freigabestellung. Locking bolt 34 again in its release position.
Nun kann sich der Kolbenbolzen wieder um 180 Grad drehen, nur diesmal nach rechts, also im Uhrzeigersinn. Dies wird wiederum nicht durch ein aktives Stellelement sondern im Wesentlichen passiv durch die Flieh- und/oder Massen- und/oder Druckkräfte bewirkt. Now, the piston pin can turn 180 degrees again, only this time to the right, so clockwise. This in turn is not caused by an active actuator but essentially passive by the centrifugal and / or mass and / or pressure forces.
Wie der Fig. 7 zu entnehmen ist, wird dann - nach der Drehung nach rechts - wieder die zweite Stirnseite 54 mit Schmieröl beaufschlagt, nur diesmal über den zweiten Kanal 58. Dadurch wird der Verriegelungsbolzen 34 zusammen mit der Federkraft in seine As can be seen from Fig. 7, then - after the rotation to the right - again the second end face 54 is acted upon by lubricating oil, only this time on the second channel 58. As a result, the locking pin 34 together with the spring force in his
Sperrstellung auf Seiten der rechten Nut 43 gedrückt und mittels des Schmieröls arretiert. Der Kolbenbolzen 10 ist wieder verriegelt. Locked position pressed on the side of the right groove 43 and locked by means of the lubricating oil. The piston pin 10 is locked again.
Dies bedeutet, dass je nach Stellung des Steuerschiebers 38 und Drehstellung des Kolbenbolzens 10 in den Aufnahmeöffnungen 26 entweder die erste Stirnseite 52 oder die zweite Stirnseite 54 mit Schmieröl beaufschlagt und der Verriegelungsbolzen 34 entsprechend bewegt (verstellt) werden kann oder der Verriegelungsbolzen 34 wird arretiert, wodurch der Kolbenbolzen 10 in den Totpunkten des Kolbens 14 verriegelt wird. This means that depending on the position of the spool 38 and rotational position of the piston pin 10 in the receiving openings 26, either the first end face 52 or the second end face 54 loaded with lubricating oil and the locking pin 34 moves accordingly (adjusted) or the locking pin 34 is locked, whereby the piston pin 10 is locked in the dead centers of the piston 14.
Es ist ersichtlich, dass mittels des einen Steuerschiebers 38 zwei Stellungen des It can be seen that by means of the one spool 38 two positions of the
Kolbenbolzens 10 und somit zwei voneinander unterschiedliche Piston pin 10 and thus two different from each other
Kompressionsverhältnisse (Verdichtungsverhältnisse) des Zylinders mittels der Compression ratios (compression ratios) of the cylinder by means of
Kolbenanordnung 12 darstellbar sind. Es kann wenigstens ein weiterer Steuerschieber wie der Steuerschieber 38 vorgesehen sein, so dass mittels des weiteren Piston assembly 12 can be displayed. It can be provided at least one further spool as the spool 38, so that by means of the other
Steuerschiebers zwei weitere Stellungen des Kolbenbolzens 10 und somit zwei weitere Kompressionsverhältnisse darstellbar sind. Zur Darstellung der zwei weiteren Spool two other positions of the piston pin 10 and thus two more compression ratios can be displayed. To illustrate the other two
Kompressionsverhältnisse ist der Kolbenbolzen 10 zum Beispiel über seine zwei Compression ratios is the piston pin 10, for example, over its two
Verbindungsbereiche 22 unter Vermittlung jeweiliger Exzenterbuchsen mit dem Kolben gekoppelt. Dies bedeutet, dass der Kolben 14 über die Exzenterbuchsen an dem Connecting portions 22 coupled to the piston through the intermediary of respective eccentric bushes. This means that the piston 14 via the eccentric bushes on the
Kolbenbolzen 10 gelagert ist. Analog zu der Drehung des Kolbenbolzens 10 relativ zu dem Kolben 14 durch Verschieben des Steuerschiebers 38 können dann Piston pin 10 is mounted. Analogous to the rotation of the piston pin 10 relative to the piston 14 by moving the spool 38 can then
Relativdrehungen der Exzenterbuchsen zu dem Kolben 14 mittels des weiteren Relative rotation of the eccentric bushes to the piston 14 by means of the other
Steuerschiebers bewirkt werden, so dass dadurch der Kolben 14 relativ zur Drehachse 20 und relativ zum Brennraumdach verstellt wird. Spool be effected so that thereby the piston 14 is adjusted relative to the axis of rotation 20 and relative to the combustion chamber roof.

Claims

Patentansprüche claims
1. Kolbenanordnung (12) für einen ein veränderbares Kompressionsverhältnis A piston assembly (12) for a variable compression ratio
aufweisenden Brennraum, insbesondere Zylinder, einer Verbrennungskraftmaschine, mit einem Kolben (14), mit einer Einrichtung (36) zum variablen Einstellen des dem Brennraum zugeordneten Kompressionsverhältnisses, und mit einem mit dem Kolben (14) über jeweilige Verbindungsbereiche (22, 24) gekoppelten Kolbenbolzen (10), über welchen der Kolben (14) mit einem Pleuel (16) der Verbrennungskraftmaschine koppelbar ist,  comprising a combustion chamber, in particular cylinder, of an internal combustion engine, with a piston (14), with means (36) for variably setting the compression ratio associated with the combustion chamber, and with a piston pin coupled to the piston (14) via respective connection regions (22, 24) (10), via which the piston (14) can be coupled to a connecting rod (16) of the internal combustion engine,
dadurch gekennzeichnet, dass  characterized in that
die Einrichtung (36) den Kolbenbolzen (10) umfasst, welcher wenigstens ein bezogen auf den Verbindungsbereich (22) des Kolbenbolzens (10) exzentrisch angeordnetes Exzenterelement (23) aufweist, über das der Kolbenbolzen (10) mit dem Pleuel (16) koppelbar ist.  the device (36) comprises the piston pin (10), which has at least one eccentric element (23) arranged eccentrically with respect to the connecting region (22) of the piston pin (10), via which the piston pin (10) can be coupled to the connecting rod (16) ,
2. Kolbenanordnung (12) nach Anspruch 1 , 2. Piston arrangement (12) according to claim 1,
dadurch gekennzeichnet, dass  characterized in that
die Einrichtung (36) wenigstens ein am Kolben (14) relativ zu dem Kolbenbolzen (10) und dem Kolben (14) zwischen zumindest zwei Stellungen bewegbar, insbesondere schräg oder senkrecht zur Längserstreckung (30) des Kolbenbolzens (10)  the device (36) at least one on the piston (14) relative to the piston pin (10) and the piston (14) between at least two positions movable, in particular obliquely or perpendicular to the longitudinal extent (30) of the piston pin (10)
verschiebbar, gehaltenes Steuerelement (38) umfasst, mittels welchem eine Drehung des Kolbenbolzens (10) relativ zu dem Kolben (14) bewirkbar und verhinderbar ist.  slidably, held control element (38), by means of which a rotation of the piston pin (10) relative to the piston (14) can be effected and prevented.
3. Kolbenanordnung (12) nach einem der Ansprüche 1 oder 2, 3. Piston arrangement (12) according to one of claims 1 or 2,
dadurch gekennzeichnet, dass  characterized in that
die Einrichtung (36) ein zumindest bereichsweise in dem Kolbenbolzen (10) aufgenommenes und schräg, insbesondere senkrecht, zur Längserstreckung des Kolbenbolzens (10) relativ zu diesem zwischen wenigstens einer Freigabestellung und wenigstens einer Sperrstellung bewegbares, insbesondere verschiebbares, Sperrelement (34) aufweist, mittels welchem in dessen Freigabestellung die Drehung des Kolbenbolzens (10) relativ zu dem Kolben (14) bewirkbar ist und mittels welchem in der Sperrstellung, in der das Sperrelement mit dem Kolben (14) zusammenwirkt, die Drehung des Kolbenbolzens (10) relativ zu dem Kolben (14) verhinderbar ist. the device (36) accommodates an at least partially in the piston pin (10) and obliquely, in particular perpendicular, to the longitudinal extent of the piston pin (10) relative to this between at least one release position and at least one locking position movable, in particular displaceable, Locking element (34), by means of which in the release position, the rotation of the piston pin (10) relative to the piston (14) is effected and by means of which in the blocking position, in which the locking element cooperates with the piston (14), the rotation of the piston pin (10) is preventable relative to the piston (14).
4. Kolbenanordnung (12) nach den Ansprüchen 2 und 3, 4. Piston arrangement (12) according to claims 2 and 3,
dadurch gekennzeichnet, dass  characterized in that
das Sperrelement (34) mittels des Steuerelements (38) zwischen der mit der ersten Stellung des Steuerelements (38) korrespondierenden Freigabestellung und der mit der zweiten Stellung des Steuerelements (38) korrespondierenden Sperrstellung bewegbar ist.  the blocking element (34) is movable by means of the control element (38) between the release position corresponding to the first position of the control element (38) and the blocking position corresponding to the second position of the control element (38).
5. Kolbenanordnung (12) nach einem der Ansprüche 3 oder 4, 5. Piston arrangement (12) according to one of claims 3 or 4,
dadurch gekennzeichnet, dass  characterized in that
das Sperrelement (34) über das Steuerelement (38) mit einem Medium, insbesondere Schmiermittel, Schmieröl oder dergleichen, der Verbrennungskraftmaschine beaufschlagbar und dadurch bewegbar ist, wobei die Beaufschlagung des  the blocking element (34) can be acted upon by the control element (38) with a medium, in particular lubricant, lubricating oil or the like, of the internal combustion engine and is thereby movable, wherein the application of the
Sperrelements (34) mit dem Medium mittels des Steuerelements (38) steuerbar ist.  Locking elements (34) with the medium by means of the control element (38) is controllable.
6. Kolbenanordnung (12) nach Anspruch 5, 6. Piston arrangement (12) according to claim 5,
dadurch gekennzeichnet, dass  characterized in that
zum Beaufschlagen des Sperrelements (34) mit dem Medium wenigstens ein am Kolben (14) vorgesehener erster Kanal (56, 58) zum Führen des Mediums zu dem Sperrelement (34) vorgesehen ist, welcher mit wenigstens einem am Kolbenbolzen (10) vorgesehenen zweiter Kanal (48, 50) zum Führen des Mediums fluidisch verbunden ist.  for applying to the blocking element (34) at least one first channel (56, 58) provided on the piston (14) for guiding the medium to the blocking element (34), which is provided with at least one second channel provided on the piston pin (10) (48, 50) is fluidly connected to guide the medium.
7. Kolbenanordnung (12) nach Anspruch 6, 7. Piston arrangement (12) according to claim 6,
dadurch gekennzeichnet, dass  characterized in that
der erste Kanal (56, 58) direkt in den Kolben (14) integriert ist.  the first channel (56, 58) is integrated directly into the piston (14).
8. Kolbenanordnung (12) nach einem der Ansprüche 6 oder 7, 8. Piston arrangement (12) according to one of claims 6 or 7,
dadurch gekennzeichnet, dass  characterized in that
in einer der Stellungen des Steuerelements (38) eine Versorgung des ersten Kanals (56, 58) mit dem Medium freigegeben und in der anderen Stellung verhindert ist. in one of the positions of the control element (38) a supply of the first channel (56, 58) is released with the medium and prevented in the other position.
9. Verbrennungskraftmaschine mit einer Kolbenanordnung (12) nach einem der vorhergehenden Ansprüche. 9. internal combustion engine with a piston assembly (12) according to any one of the preceding claims.
10. Verbrennungskraftmaschine nach den Ansprüchen 9 und 2 oder nach Anspruch 9 und einem der Ansprüche 3 bis 8 in dessen Rückbezug auf Anspruch 2, 10. Internal combustion engine according to claims 9 and 2 or according to claim 9 and one of claims 3 to 8 in its return to claim 2,
dadurch gekennzeichnet, dass  characterized in that
der Kolben (14) wenigstens eine eine außenumfangsseitige Mantelfläche (40) des Kolbens (14) durchdringende Durchgangsöffnung (42) aufweist, über welche zum Bewegen des Steuerelements (38) zwischen dessen Stellungen das Steuerelement (38) von außerhalb des Kolbens (14) mit einem Medium, insbesondere Schmieröl, der Verbrennungskraftmaschine beaufschlagbar ist.  the piston (14) has at least one passage opening (42) penetrating through an outer peripheral side surface (40) of the piston (14), via which the control element (38) can be moved from outside the piston (14) to move the control element (38) between its positions a medium, in particular lubricating oil, the internal combustion engine can be acted upon.
EP20120756660 2011-10-08 2012-09-04 Piston arrangement for a combustion chamber of an internal combustion engine, having a variable compression ratio Not-in-force EP2764229B1 (en)

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DE102011115417A DE102011115417A1 (en) 2011-10-08 2011-10-08 Piston arrangement for a variable compression ratio having combustion chamber of an internal combustion engine
PCT/EP2012/003700 WO2013050100A1 (en) 2011-10-08 2012-09-04 Piston arrangement for a combustion chamber of an internal combustion engine, having a variable compression ratio

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WO2013050100A1 (en) 2013-04-11
CN103874837A (en) 2014-06-18
EP2764229B1 (en) 2015-05-06
DE102011115417A1 (en) 2013-04-11
JP5917702B2 (en) 2016-05-18
US20140311439A1 (en) 2014-10-23
US9309831B2 (en) 2016-04-12
CN103874837B (en) 2016-08-17
JP2014529038A (en) 2014-10-30

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