EP3267011A1 - Dispositif de modification d'un rapport de compression d'un moteur à combustion interne à pistons alternatifs - Google Patents

Dispositif de modification d'un rapport de compression d'un moteur à combustion interne à pistons alternatifs Download PDF

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Publication number
EP3267011A1
EP3267011A1 EP17172625.0A EP17172625A EP3267011A1 EP 3267011 A1 EP3267011 A1 EP 3267011A1 EP 17172625 A EP17172625 A EP 17172625A EP 3267011 A1 EP3267011 A1 EP 3267011A1
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EP
European Patent Office
Prior art keywords
gear
crankshaft
piston
combustion engine
connecting rod
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.)
Withdrawn
Application number
EP17172625.0A
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German (de)
English (en)
Inventor
Ulrich Gutzer
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.)
Bayerische Motoren Werke AG
Original Assignee
Bayerische Motoren Werke 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 Bayerische Motoren Werke AG filed Critical Bayerische Motoren Werke AG
Publication of EP3267011A1 publication Critical patent/EP3267011A1/fr
Withdrawn legal-status Critical Current

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    • 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
    • F02B75/048—Engines with variable distances between pistons at top dead-centre positions and cylinder heads by means of a variable crank stroke length

Definitions

  • the invention relates to a device for changing a compression ratio of a reciprocating internal combustion engine having the features of the preamble of patent claim 1.
  • a variable compression ratio opens up consumption and performance potentials by adapting it to the load condition of the internal combustion engine, which remain unused with a fixed compression ratio.
  • crank mechanism has a crankshaft, with both sides rotatably mounted crank pin, each with a connecting rod and a sliding in a cylinder of the reciprocating internal combustion engine arranged piston in Active compound stand. This results in the conversion of the rotational movement of the crankshaft into a bidirectional translational movement of the pistons in the cylinders with a defined lifting height.
  • a rotatable, externally toothed eccentric is arranged, with the aid of which the lifting height of the piston adjustable, and the compression ratio is variable.
  • an externally toothed first gear is provided for rotating the eccentric, which is rotatably connected axially with a second gear via a shaft arranged parallel to the crankshaft.
  • This gear interacts with an internally toothed gear, which is rotatable by a worm.
  • a disadvantage of this configuration is a significant weakening of the load-bearing structure of the crankshaft, in particular in the region of the main bearing, by the necessary for Phasenwinkel-, or compression adjustment synchronization transmission from the crankcase to the eccentric bearing shells. This leads to a reduction in the achievable increased efficiency of the internal combustion engine associated with the compression adjustment and to an increase in the frictional losses due to increased bearing diameters, whereby essential parts of the achievable potential are again consumed by the variable compression ratio of the internal combustion engine.
  • the reciprocating internal combustion engine has a crank mechanism with a crankshaft with at least one crank pin rotatably mounted on both sides, with a connecting rod and a piston movably movably arranged in a cylinder of the reciprocating internal combustion engine Active connection stands up to the conversion of a rotational movement of the crankshaft in a bidirectional, translational movement of the piston with a defined lifting height.
  • a rotatable, externally toothed eccentric is arranged to change the lifting height of the piston, wherein an externally toothed first gear is provided for rotating the eccentric axially parallel with a second gear via a crankshaft and with her circumferentially arranged shaft is rotatably connected, which is arranged on a meshing, rotatable by an actuating element third gear, wherein the shaft is arranged parallel and radially spaced from the crankshaft.
  • the object of the present invention is o. G. To avoid disadvantages.
  • a device for changing the compression ratio of a reciprocating internal combustion engine, which acts around the load-bearing crankshaft structures outside and at the same time ensures the necessary speed ratios.
  • the rotatably mounted in the crankcase gears (third and fourth gear) move only in the adjustment of the compression ratio, but not constantly due to the rotation of the crankshaft.
  • the device itself is stored here to save space rotatably mounted in the crankcase.
  • the proposed device according to claim 1 is suitable for a single-cylinder reciprocating internal combustion engine.
  • the embodiment according to claim 2 is suitable for a multi-cylinder reciprocating internal combustion engine.
  • the embodiment according to claim 3 is particularly compact.
  • the drives of the third or fourth gear according to claim 4 are particularly preferred embodiments.
  • the arrangement acc. Claim 5 is particularly compact and can be integrated with only minor changes in an existing crankcase.
  • the embodiment according to claim 6 is a variant.
  • Fig. 1 schematically shows an inventive device for varying a compression ratio of a reciprocating internal combustion engine with two cylinders.
  • the reciprocating internal combustion engine has a crank mechanism 1, with a dashed crankshaft 2 with two mutually rotatably mounted crank pins 3, 3 ', each with a connecting rod 4, 4' and one in a cylinder 5, 5 'of the reciprocating internal combustion engine Bidirectionally sliding movably arranged pistons 6, 6 'are in operative connection.
  • a crankshaft axis is numbered 2 '. This part of the device is used to convert a rotational movement of the crankshaft 2 in a bidirectional, translational movement of the piston 6, 6 'with a defined lifting height.
  • a rotatable, externally toothed eccentric 7, 7 ' is in each case a rotatable, externally toothed eccentric 7, 7 'arranged to change the lifting height of the piston 6, 6'.
  • an externally toothed first gear 8 is provided, which is axially connected in rotation with a second gear via a parallel to the crankshaft 2 arranged Weller10.
  • the second gear 9 is rotatably connected in this embodiment via the third gear 12 with a fourth gear 13 having a larger outer diameter than the revolving second gear 9.
  • the fourth gear 13 is rotatably adjustable in this embodiment via an actuating element 11.
  • the third and fourth gear 12, 13 are rotatably mounted in a crankcase of the reciprocating internal combustion engine.
  • the eccentric 7 is rotated and thus changes the compression ratio of the internal combustion engine.
  • the shaft 10 is arranged parallel to and radially outwardly spaced from the crankshaft 2. In this case, the rotational movement of the crankshaft 2 and the adjusting movement of the fourth gear 13 can take place simultaneously and at different speeds.
  • This basic adjustment mechanism or this device for changing the compression ratio of the reciprocating internal combustion engine can be used for a reciprocating internal combustion engine with a cylinder.
  • a reciprocating internal combustion engine is shown with two cylinders, engages in the outer toothing of the eccentric 7, a fifth gear 14 which rotatably on a parallel to the crankshaft axis 2 'arranged second Shaft 15 rotatably connected to a sixth gear 14 ', which transmits the adjustment of the fifth gear 14 to an outer toothing of the second eccentric 7'.
  • the fourth gear 13 can be omitted and the actuator 11 acts directly on the third gear 12 a.
  • Fig. 1 is the second shaft 14 disposed in an axial through hole of the crankshaft 2 coaxial with the crankshaft 2, which allows a very space-saving design.
  • the third or fourth gear 12, 13 may be rotated by the actuator 11 via a seventh gear or a rack or a worm or a slider.
  • Fig. 2 shows a device for varying the compression ratio of a reciprocating internal combustion engine with six cylinders.
  • the two middle cylinders again show the same kinematics as Fig. 1 however, adjacent to the two middle cylinders on each side there are two further non-numbered cylinders with the same crank mechanism, each having a drive-through with a second shaft 15, for varying the compression ratio of the four other non-numbered cylinders.
  • the cylinder 6 of the reciprocating internal combustion engine a high compression 16 and the cylinder 6 'has a low compression 17.
  • Fig. 3 schematically shows an end view of the inventive device for varying the compression ratio of a reciprocating internal combustion engine for a specific embodiment, as shown in the FIGS. 1 and 2 can be used.
  • the gears have the following numbers of teeth: Eccentric 7: 55 teeth First gear 8: 15 teeth Second gear 9 36 teeth Third gear 12: 66 teeth Fourth gear 13: 148 teeth
  • the directions of rotation of the individual gears to a larger compression ratio out are indicated schematically by arrows.
  • the cylinder direction is upwards, d. H. in the direction of the crank pin, and the eccentric third
  • Fig. 4 shows schematically an end view of a device according to the invention for varying the compression ratio of a reciprocating internal combustion engine for a second specific embodiment. It essentially applies to Fig. 3 said, but in this second embodiment between the first gear 8 and the fifth gear 14, an intermediate gear 19 is arranged, which consists in this embodiment of only a single gear.
  • Fig. 5 shows a technical embodiment of the inventive device for varying the compression ratio of a reciprocating internal combustion engine.
  • the crankshaft 2 and a crankcase are not shown.
  • Fig. 5 are three storage rollers 20 for the fourth gear 13 can be seen, with which the fourth gear 13 is rotatably mounted radially outwardly relative to the crankcase of the reciprocating internal combustion engine.
  • three storage rollers 20 are provided for a statically determined storage.
  • Fig. 5 is the device Space-saving between two cylinders 5, 5 'of the reciprocating internal combustion engine arranged, whereby they can be integrated into an existing crankcase without much rework.
  • crank pin connected in series sliding bearing can be even lower than that of an original Hubzapfenschleitlager from the prior art, namely, if the sum of the two bearing clearance can remain greater than that of the original one sliding bearing (the friction is proportional to the relative speed squared divided by the bearing clearance).
  • a valve lift adjustment device eg BMW Valvetronic
  • a variable compression ratio with a variable valve train, for example, from the German patent application DE 10 2006 015 887 A1 known.
  • the numbers of teeth are chosen so that the bearing shell (eccentric 7) with the desired speed around the crank pin 3 of the crankshaft 2 rotates.
  • the adjusting wheel (fourth gear 13) is stationary, the phase angle of the rotation and thus the compression of the reciprocating internal combustion engine remain constant.

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)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
EP17172625.0A 2016-07-04 2017-05-24 Dispositif de modification d'un rapport de compression d'un moteur à combustion interne à pistons alternatifs Withdrawn EP3267011A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102016212064.6A DE102016212064A1 (de) 2016-07-04 2016-07-04 Vorrichtung zum Verändern eines Kompressionsverhältnisses einer Hubkolben-Brennkraftmaschine

Publications (1)

Publication Number Publication Date
EP3267011A1 true EP3267011A1 (fr) 2018-01-10

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP17172625.0A Withdrawn EP3267011A1 (fr) 2016-07-04 2017-05-24 Dispositif de modification d'un rapport de compression d'un moteur à combustion interne à pistons alternatifs

Country Status (2)

Country Link
EP (1) EP3267011A1 (fr)
DE (1) DE102016212064A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018128524A1 (de) * 2018-11-14 2020-05-14 Bayerische Motoren Werke Aktiengesellschaft Vorrichtung zum Verändern eines Kompressionsverhältnisses, Hubkolbenbrennkraftmaschine und Arbeitsvorrichtung
DE102020125044A1 (de) 2020-09-25 2022-03-31 Bayerische Motoren Werke Aktiengesellschaft Kurbelwellenvorrichtung für ein variables Verdichtungsverhältnis, Herstellungsverfahren und Kraftfahrzeug

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019123601A1 (de) * 2019-09-04 2021-03-04 Bayerische Motoren Werke Aktiengesellschaft Hubkolben-Brennkraftmaschine mit einem variablen Verdichtungsverhältnis

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE379257C (de) * 1922-01-17 1923-08-18 Hans Rohrbach Verbrennungskraftmaschine mit veraenderlichem Kolbenhub
FR986605A (fr) * 1943-11-23 1951-08-02 Dispositif de variation, en marche, du rapport volumétrique d'un moteur
EP0184042A2 (fr) 1984-11-23 1986-06-11 Politechnika Warszawska Mécanisme vilebrequin-manivelle d'un moteur à combustion interne à course variable
DE102006015887A1 (de) 2006-04-05 2007-10-18 Bayerische Motoren Werke Ag Hubkolben-Brennkraftmaschine
EP2025893A1 (fr) * 2007-08-09 2009-02-18 Gomecsys B.V. Mécanisme réciproque de piston
WO2011006537A1 (fr) 2009-07-15 2011-01-20 Sleper, Joannes, Jacobus, Josephus Mécanisme à piston alternatif
WO2012143078A1 (fr) * 2011-04-19 2012-10-26 Bayerische Motoren Werke Aktiengesellschaft Dispositif servant à faire varier un taux de compression d'un moteur à combustion interne à piston alternatif

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011120162A1 (de) * 2011-12-06 2013-06-06 Fev Gmbh Verbrennungskraftmaschine mit variabler Verdichtung
DE102013225063A1 (de) * 2013-12-06 2015-06-11 Hochschule Heilbronn Technik, Wirtschaft, Informatik Pleuelstange einer Brennkraftmaschine mit variabler Länge

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE379257C (de) * 1922-01-17 1923-08-18 Hans Rohrbach Verbrennungskraftmaschine mit veraenderlichem Kolbenhub
FR986605A (fr) * 1943-11-23 1951-08-02 Dispositif de variation, en marche, du rapport volumétrique d'un moteur
EP0184042A2 (fr) 1984-11-23 1986-06-11 Politechnika Warszawska Mécanisme vilebrequin-manivelle d'un moteur à combustion interne à course variable
DE102006015887A1 (de) 2006-04-05 2007-10-18 Bayerische Motoren Werke Ag Hubkolben-Brennkraftmaschine
EP2025893A1 (fr) * 2007-08-09 2009-02-18 Gomecsys B.V. Mécanisme réciproque de piston
WO2011006537A1 (fr) 2009-07-15 2011-01-20 Sleper, Joannes, Jacobus, Josephus Mécanisme à piston alternatif
WO2012143078A1 (fr) * 2011-04-19 2012-10-26 Bayerische Motoren Werke Aktiengesellschaft Dispositif servant à faire varier un taux de compression d'un moteur à combustion interne à piston alternatif

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018128524A1 (de) * 2018-11-14 2020-05-14 Bayerische Motoren Werke Aktiengesellschaft Vorrichtung zum Verändern eines Kompressionsverhältnisses, Hubkolbenbrennkraftmaschine und Arbeitsvorrichtung
US11401859B2 (en) 2018-11-14 2022-08-02 Bayerische Motoren Werke Aktiengesellschaft Device for varying a compression ratio, reciprocating-piston internal combustion engine and working device
DE102018128524B4 (de) 2018-11-14 2022-09-22 Bayerische Motoren Werke Aktiengesellschaft Vorrichtung zum Verändern eines Kompressionsverhältnisses, Hubkolbenbrennkraftmaschine und Arbeitsvorrichtung
DE102020125044A1 (de) 2020-09-25 2022-03-31 Bayerische Motoren Werke Aktiengesellschaft Kurbelwellenvorrichtung für ein variables Verdichtungsverhältnis, Herstellungsverfahren und Kraftfahrzeug

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Publication number Publication date
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