WO2012139620A1 - Dispositif de réglage pour le réglage variable d'un taux de compression d'un moteur à combustion interne - Google Patents

Dispositif de réglage pour le réglage variable d'un taux de compression d'un moteur à combustion interne Download PDF

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Publication number
WO2012139620A1
WO2012139620A1 PCT/EP2011/006213 EP2011006213W WO2012139620A1 WO 2012139620 A1 WO2012139620 A1 WO 2012139620A1 EP 2011006213 W EP2011006213 W EP 2011006213W WO 2012139620 A1 WO2012139620 A1 WO 2012139620A1
Authority
WO
WIPO (PCT)
Prior art keywords
compression ratio
adjusting
adjusting device
bearing
component
Prior art date
Application number
PCT/EP2011/006213
Other languages
German (de)
English (en)
Inventor
Klaus Fieweger
Hansjörg FINKBEINER
Gernot Kurtzer
Markus Lengfeld
Dietmar Schröer
Georg Seidel
Alexander Von Gaisberg-Helfenberg
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 WO2012139620A1 publication Critical patent/WO2012139620A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/04—Engines with variable distances between pistons at top dead-centre positions and cylinder heads
    • 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

  • the invention relates to an adjusting device for variably setting at least one compression ratio of an internal combustion engine, in particular a reciprocating piston internal combustion engine, the type specified in the preamble of claim 1.
  • the invention also relates to such a control device of the
  • JP 2007-239520 discloses such an actuator for variably setting at least one compression ratio of a reciprocating internal combustion engine.
  • DE 195 25 831 A1 discloses a planetary gear with a driven sun gear as known, wherein the transmission comprises a first and a second, each internally and conically toothed ring gear. Of these, the first is fixed and the second is rotatably mounted and forms the output.
  • the planetary gear further includes stepped planetary geared planetary gears mounted in a planetary carrier in such a manner as to be in constant mesh with the sun gear and the ring gears. It is provided that the inclination angle of the gears of the step wheels and the ring gears are opposite to each other.
  • the known adjusting devices have an undesirably high space requirement and an undesirably high assembly costs.
  • the first aspect of the invention relates to an adjusting device for variably setting at least one compression ratio of an internal combustion engine, in particular a reciprocating internal combustion engine.
  • the adjusting device comprises at least one motor, which serves to apply forces and / or torques for setting or adjusting the compression ratio or
  • the adjusting device further comprises at least one transmission via which the
  • Compression ratio is adjustable.
  • the transmission includes, for example, at least one pair of gears with two gears, which are engaged with each other via respective gears.
  • the adjusting device further comprises at least one braking device, by means of which the set compression ratio is at least substantially maintained.
  • the braking device thus serves to maintain the set compression ratio in particular against forces and / or torques resulting from combustion processes of the internal combustion engine, so that the compression ratio is not adjusted or adjusted undesirably to a different value.
  • the brake device and the transmission are integrated by integrating them into at least one of the brake device and the transmission
  • Actuator according to the first aspect of the invention only a very small
  • the adjusting device has only a very small number of parts and a low weight.
  • the actuator of the first aspect of the invention has a low
  • the effort to ensure a coaxiality of the transmission and the braking device and a cost for tolerance compensation between them can be kept low due to the summary of the corresponding components to the corresponding module.
  • the second aspect of the invention relates to an adjusting device for variably setting at least one compression ratio of an internal combustion engine, in particular a reciprocating internal combustion engine, with at least one engine.
  • the motor serves to apply forces and / or torques to thereby adjust the compression ratio.
  • the adjusting device of the second aspect of the invention further comprises at least one braking device by means of which the set compression ratio is at least substantially to be maintained.
  • the set compression ratio can be maintained in particular counter to forces and / or moments resulting from combustion processes of the internal combustion engine and an undesired adjustment of the compression ratio can be avoided.
  • Braking device is integrated in at least one bearing for mutual storage of two relatively movable components for adjusting the compression ratio.
  • at least one of the relatively movable components serves to transmit the forces and / or torques applied by the engine for setting the compression ratio, so that
  • these components can now be fixed relative to each other and secured against relative movement, so that the set compression ratio can no longer change undesirable and independently.
  • the adjusting device of the second aspect of the invention has a particularly low
  • the bearing is designed as a bearing, in particular a plain bearing, an adjusting shaft, in particular an eccentric shaft, wherein the adjusting shaft is one of the components.
  • the adjusting shaft is rotatably supported via the bearing on the second component of the adjusting device about an axis of rotation relative to the second component.
  • the second component is
  • This integration of the braking device in the bearing of the adjusting shaft has the advantage that thereby the forces and / or torques, which against the set
  • Compression ratio act, particularly advantageous and at least substantially absorbed and supported directly.
  • the adjusting shaft has a certain diameter, which makes it possible for the bearing with respect to its
  • the braking device comprises at least one of the components
  • the outer circumference at least partially surrounding bearing part, in particular a bearing ring of the bearing.
  • the bearing part is for holding the one component, in particular the adjusting, relative to the second component in at least indirectly operative connection with the one component relative to this movable.
  • the bearing part is movable both relative to the one and relative to the second component in order to fix the one component relative to the second component.
  • the bearing part is formed for example as a bearing ring, which is slotted. As a result, the bearing ring can be moved in the direction of the adjusting shaft, ie it can be clamped, and thus frictionally fix the adjusting shaft mounted on the housing to the housing, ie fix it relative to the housing.
  • the adjusting shaft can be held against large forces and / or torques, and with only a very small space requirement and with only a very small number of parts. This keeps the weight, the cost and space requirements of the entire actuator particularly low.
  • the braking device comprises an actuator, by means of which, for forming the operative connection, the bearing part is movable relative to the one component, in particular to the adjusting shaft.
  • the bearing part is movable relative to the one component, in particular to the adjusting shaft.
  • a particularly needs-based maintenance of a component and thus the compression ratio can be carried out, since the actuator is quickly and as needed between a release position and at least one holding position movable.
  • the release position the one component is released so that it can be moved to adjust the compression ratio.
  • the holding position the one component is fixed relative to the second component, so that the
  • Compression ratio is particularly secured against unwanted adjustment.
  • the actuator of the braking device is designed as a piezo actuator.
  • the actuator has only a very small space requirement, what the space requirement of the entire
  • Actuator keeps in a very small frame. Furthermore, the piezoelectric actuator allows particularly fast switching of the braking device between the release position and the holding position, so that particularly frequent adjustments of the
  • the adjusting device of the second aspect of the invention advantageously comprises a gear, which comprises, for example, at least one pair of gears with two gears.
  • the gears are engaged via respective gears with each other.
  • the compression ratio can be adjusted via the transmission, wherein the transmission is preferably arranged between the engine and the adjusting shaft in a force and / or torque flow from the engine to the adjusting shaft.
  • the engine which is designed for example as an electric motor, only relatively small torques apply, which are converted by the transmission in contrast very high torques.
  • the gearbox can in contrast convert relatively small actuating torques, so as to adjust or adjust the compression ratio, even against relatively high forces and / or torques.
  • the engine can be particularly small in terms of its
  • the drawing shows a schematic diagram of a control device for variable
  • the pursuit to reduce fuel consumption of reciprocating internal combustion engines leads to provide the reciprocating internal combustion engines each with at least one adjusting device by means of which at least one compression ratio of the associated reciprocating internal combustion engine is variably adjustable.
  • the FIGURE shows such a control device 10, by means of which the compression ratio of thermodynamic requirements of the reciprocating internal combustion engine is adaptable.
  • the associated reciprocating internal combustion engine has at least one combustion chamber in the form of a cylinder, in which a piston is received translationally relative to the cylinder displaceable.
  • the piston is pivotally coupled to a connecting rod, which in turn is coupled to a lever element of the adjusting device 10.
  • the lever element is rotatably mounted on a crank pin of a crankshaft of the reciprocating internal combustion engine relative to the crank pin.
  • the one hand with the connecting rod articulated lever element on the other hand at least indirectly coupled to an adjusting shaft 12 of the adjusting device 10 articulated.
  • the adjusting shaft 12 is formed for example as an eccentric shaft and has at least one eccentric on which the lever element is rotatably mounted at least indirectly relative to the eccentric.
  • Adjusting shaft 12 the piston in the cylinder can be moved relative to this translational.
  • the adjusting shaft 12 is rotated about an axis of rotation 14 of the adjusting shaft. This causes a rotation of the lever member relative to the crank pin, which in turn results in the translational movement of the piston in the cylinder relative thereto.
  • the adjusting shaft 12 is rotatably mounted about at least one bearing on a housing part of the reciprocating internal combustion engine and / or the adjusting device 10 relative to the housing part about the axis of rotation 4.
  • combustion processes occur in the cylinder. From these combustion processes forces and / or torques resulting from the piston and the
  • the adjusting device 10 comprises a
  • Braking device 20 by means of which the currently set compression ratio is at least substantially constant.
  • the adjusting device 10 For adjusting the compression ratio, i. for the desired rotation of the adjusting shaft 12 about the axis of rotation 14, the adjusting device 10 comprises an electric motor.
  • the electric motor applies a torque, which is introduced into the adjusting shaft 12.
  • the adjusting device 10 comprises a gearbox 18.
  • the gearbox 18 is preferably arranged between the electric motor 16 and the adjusting shaft 12 in a torque flow from the electric motor 16 to the adjusting shaft 12. In this way, a torque expended by the electric motor 16 can be converted into a setting torque which is higher in terms of magnitude, so that the compression ratio can be adjusted against the acting forces and / or torques by means of the relatively high actuating torque.
  • the transmission 18 and the brake device 20 are integrated into a housing 22 common to the transmission 18 and the brake device 20.
  • the transmission 18 and the brake device 20 are combined to form a separate assembly 24 from the electric motor 16.
  • the assembly 24 is coupled via a connecting shaft 26 with the electric motor 16, so that the electric motor 16 can apply a torque for adjusting the compression ratio and can initiate the transmission 8.
  • the transmission 8 then converts this torque into a higher torque (actuating torque) and introduces it into the adjusting shaft 12.
  • the adjusting device 10 has due to the integration of the transmission 16 and the
  • Braking device 20 in the common housing 22 a very small
  • the assembly 24 may be at least substantially parallel to the rest in time
  • Adjusting device 10 is mounted and then connected time and cost with the gear 18 and with the electric motor 16 via the connecting shaft 26. As part of the pre-assembly may also be carried out a review of the assembly 24, so that any malfunction should be excluded and avoided.
  • the braking device 20 is at least partially integrated in the bearing, via which the adjusting shaft 12 is mounted on the housing part.
  • the bearing includes, for example, one of
  • Brake device 20 associated slotted bearing ring.
  • the bearing ring surrounds the adjusting shaft 12 in the circumferential direction on the outer peripheral side over at least a portion. If the bearing ring is tensioned by means of an actuator of the brake device 20 and thus moved into contact with the adjusting shaft 12, a frictional engagement between the bearing ring and the adjusting shaft 12 can be formed thereby. Thus, the adjusting shaft 12 and the bearing ring can be fixed relative to each other.
  • the bearing ring is on the other hand firmly supported on the housing part relative to this, so that the adjusting shaft 12 can be fixed relative to the housing via the bearing ring and the frictional engagement formed with this. Thus, an undesired rotation of the adjusting shaft 12 can be avoided, whereby the set compression ratio over a certain period of time can be kept at least substantially constant.

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  • 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)

Abstract

L'invention concerne un dispositif de réglage (10) pour le réglage variable d'au moins un taux de compression d'un moteur à combustion interne, en particulier d'un moteur alternatif à combustion interne, ledit dispositif de réglage comprenant au moins un moteur (16) permettant un réglage variable du taux de compression, comportant au moins un engrenage (18) par l'intermédiaire duquel le taux de compression peut être réglé, et au moins un système de frein (20) au moyen duquel le taux de compression sélectionné peut être sensiblement maintenu, le système de frein (20) et l'engrenage (18) étant réunis par incorporation de ceux-ci dans au moins un élément de carter (22) commun au système de frein (20) et à l'engrenage (18), pour former un bloc (24) séparé du moteur.
PCT/EP2011/006213 2011-04-15 2011-12-09 Dispositif de réglage pour le réglage variable d'un taux de compression d'un moteur à combustion interne WO2012139620A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011017182.7 2011-04-15
DE201110017182 DE102011017182A1 (de) 2011-04-15 2011-04-15 Stelleinrichtung zum variablen Einstellen eines Verdichtungsverhältnisses einer Verbrennungskraftmaschine

Publications (1)

Publication Number Publication Date
WO2012139620A1 true WO2012139620A1 (fr) 2012-10-18

Family

ID=45440472

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2011/006213 WO2012139620A1 (fr) 2011-04-15 2011-12-09 Dispositif de réglage pour le réglage variable d'un taux de compression d'un moteur à combustion interne

Country Status (2)

Country Link
DE (1) DE102011017182A1 (fr)
WO (1) WO2012139620A1 (fr)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19525831A1 (de) 1995-07-15 1997-01-16 Zahnradfabrik Friedrichshafen Planetengetriebe
DE19627145A1 (de) * 1996-07-05 1998-01-08 Andreas Hilker Verfahren und Vorrichtung zum Betätigen einer Schlingfederbandkupplung
DE20118997U1 (de) * 2001-11-21 2002-01-24 Fev Motorentech Gmbh Stellantrieb für eine in ihrem Verdichtungsverhältnis einstellbare Kolbenbrennkraftmaschine
US6789515B1 (en) * 1999-11-30 2004-09-14 Institut Francais Du Petrole Method and device for modifying the compression rate to optimize operating conditions of reciprocating piston engines
DE102005020270A1 (de) * 2005-04-30 2006-11-09 Daimlerchrysler Ag Brennkraftmaschine mit variablem Verdichtungsverhältnis
JP2007239520A (ja) 2006-03-07 2007-09-20 Nissan Motor Co Ltd 内燃機関の可変圧縮比装置
DE102008040459A1 (de) * 2008-07-16 2010-01-21 Zf Friedrichshafen Ag Verstellvorrichtung eines Verbrennungsmotors
DE102008050827A1 (de) * 2008-10-08 2010-04-15 Schaeffler Kg Verstellvorrichtung für eine Kurbelwelle eines Verbrennungsmotors sowie Verfahren zu deren Ansteuerung

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19525831A1 (de) 1995-07-15 1997-01-16 Zahnradfabrik Friedrichshafen Planetengetriebe
DE19627145A1 (de) * 1996-07-05 1998-01-08 Andreas Hilker Verfahren und Vorrichtung zum Betätigen einer Schlingfederbandkupplung
US6789515B1 (en) * 1999-11-30 2004-09-14 Institut Francais Du Petrole Method and device for modifying the compression rate to optimize operating conditions of reciprocating piston engines
DE20118997U1 (de) * 2001-11-21 2002-01-24 Fev Motorentech Gmbh Stellantrieb für eine in ihrem Verdichtungsverhältnis einstellbare Kolbenbrennkraftmaschine
DE102005020270A1 (de) * 2005-04-30 2006-11-09 Daimlerchrysler Ag Brennkraftmaschine mit variablem Verdichtungsverhältnis
JP2007239520A (ja) 2006-03-07 2007-09-20 Nissan Motor Co Ltd 内燃機関の可変圧縮比装置
DE102008040459A1 (de) * 2008-07-16 2010-01-21 Zf Friedrichshafen Ag Verstellvorrichtung eines Verbrennungsmotors
DE102008050827A1 (de) * 2008-10-08 2010-04-15 Schaeffler Kg Verstellvorrichtung für eine Kurbelwelle eines Verbrennungsmotors sowie Verfahren zu deren Ansteuerung

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DE102011017182A1 (de) 2012-10-18

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