EP2699779A1 - Vorrichtung zum verändern eines kompressionsverhältnisses einer hubkolben-brennkraftmaschine - Google Patents
Vorrichtung zum verändern eines kompressionsverhältnisses einer hubkolben-brennkraftmaschineInfo
- Publication number
- EP2699779A1 EP2699779A1 EP12713879.0A EP12713879A EP2699779A1 EP 2699779 A1 EP2699779 A1 EP 2699779A1 EP 12713879 A EP12713879 A EP 12713879A EP 2699779 A1 EP2699779 A1 EP 2699779A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- gear
- crankshaft
- internal combustion
- combustion engine
- piston
- 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.)
- Ceased
Links
- 230000006835 compression Effects 0.000 title claims abstract description 46
- 238000007906 compression Methods 0.000 title claims abstract description 46
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 38
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 5
- 230000008859 change Effects 0.000 claims description 3
- 230000007246 mechanism Effects 0.000 description 5
- 230000009471 action Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B75/00—Other engines
- F02B75/04—Engines with variable distances between pistons at top dead-centre positions and cylinder heads
- F02B75/047—Engines with variable distances between pistons at top dead-centre positions and cylinder heads by means of variable crankshaft position
-
- 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
-
- 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 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, which are in each case operatively connected to a connecting rod and a piston in a cylinder of the reciprocating internal combustion engine piston arranged displaceably. 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 twisted 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 gear 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.
- a device for changing the compression ratio of a reciprocating internal combustion engine, which acts around the lattragenden 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 nac claim 1 proposed device is suitable for a single-cylinder reciprocating internal combustion engine.
- the embodiment according to claim 2 is a particularly preferred embodiment.
- the embodiment according to claim 3 makes it possible to use the device according to the invention in multi-cylinder series reciprocating internal combustion engines.
- the embodiment according to claim 4 is particularly compact.
- the drives of the third or fourth gear according to claim 5 are particularly preferred embodiments.
- Fig. 1 shows schematically a device according to the invention for
- Fig. 2 shows schematically a second device according to the invention for varying the compression ratio of a reciprocating internal combustion engine with six cylinders.
- Fig. 3 shows schematically an end view of a device according to the invention
- Fig. 4 shows schematically an end view of a device according to the invention
- Fig. 1 shows schematically an inventive device for varying a compression ratio of a reciprocating internal combustion engine with two cylinders.
- the compression ratio ⁇ is the ratio of an entire cylinder space of an internal combustion engine before compression to the remaining space after compression.
- V H displacement (piston stroke * piston area)
- V K compression volume
- 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.
- the connecting rods 4, 4' 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 wave 0.
- 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.
- 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 the outer teeth of the eccentric 7, a fifth gear 14, which rotatably connected via a parallel to the crankshaft axis 2 'arranged second shaft 15 rotatably connected to a sixth gear 14' , which transmits the adjustment movement 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.
- the second shaft 14 is 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, but 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 changing the Compression ratio of the four other, unnumbered cylinder.
- the cylinder 6 of the reciprocating internal combustion engine has a high compression 16 and the cylinder 6 'has a low compression 17.
- Fig. 3 shows schematically an end view of the inventive device for varying the compression ratio of a reciprocating internal combustion engine for a specific embodiment, as it can be used in Figures 1 and 2.
- the gears have the following numbers of 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.
- crank pin connected in series sliding bearing can be even lower than that of an original Hubzapfenschleitlager from the prior art, namely, namely, 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).
- crankcase-side control element 11 Since the position of the crankcase-side control element 11 clearly reflects the set compression ratio (in contrast to known systems, which have only one stop and the system can adjust itself under the forces acting), can Voriiegen a Ventilhubyerstellvor512 (eg BMW Valvetronic) a mechanical coupling of valve lift or phase angle with the compression ratio.
- Voriiegen a Ventilhubyerstellvorraum eg BMW Valvetronic
- An example of the combination of a variable compression Ratio with a variable valve train is known for example from German Patent Application DE 10 2006 015 887 AI. Since low compression is generally combined with large valve lifts and vice versa at high load, valve releases in the piston can thus be minimized, which opens up further thermodynamic fuel consumption potentials through a more favorable combustion chamber shape.
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)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102011018166A DE102011018166A1 (de) | 2011-04-19 | 2011-04-19 | Vorrichtung zum Verändern eines Kompressionsverhältnisses einer Hubkolben-Brennkraftmaschine |
PCT/EP2012/001273 WO2012143078A1 (de) | 2011-04-19 | 2012-03-22 | Vorrichtung zum verändern eines kompressionsverhältnisses einer hubkolben-brennkraftmaschine |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2699779A1 true EP2699779A1 (de) | 2014-02-26 |
Family
ID=45953063
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12713879.0A Ceased EP2699779A1 (de) | 2011-04-19 | 2012-03-22 | Vorrichtung zum verändern eines kompressionsverhältnisses einer hubkolben-brennkraftmaschine |
Country Status (4)
Country | Link |
---|---|
US (1) | US9249724B2 (de) |
EP (1) | EP2699779A1 (de) |
DE (1) | DE102011018166A1 (de) |
WO (1) | WO2012143078A1 (de) |
Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102013006553B4 (de) | 2013-04-09 | 2019-09-05 | Ziyavdin Achmerzaev | Kolben-Zylinder-Kraftmaschine |
DE202013003567U1 (de) | 2013-04-09 | 2013-04-29 | Ziyavdin Achmerzaev | Kolben-Zylinder-Arbeitsmaschine |
CN103244260B (zh) * | 2013-05-16 | 2015-09-23 | 沈大兹 | 一种可变压缩比和可变膨胀比装置 |
DE102014216460B4 (de) | 2014-08-19 | 2022-02-24 | Bayerische Motoren Werke Aktiengesellschaft | Stirnzahnrad |
CN105605081A (zh) * | 2016-03-18 | 2016-05-25 | 蔡建龙 | 一种发动机曲轴 |
DE102016212064A1 (de) * | 2016-07-04 | 2018-01-04 | Bayerische Motoren Werke Aktiengesellschaft | Vorrichtung zum Verändern eines Kompressionsverhältnisses einer Hubkolben-Brennkraftmaschine |
DE102016221603A1 (de) | 2016-11-04 | 2018-05-09 | Bayerische Motoren Werke Aktiengesellschaft | Axiallager für eine Synchronwelle |
DE102017207464A1 (de) | 2017-05-04 | 2018-11-08 | Bayerische Motoren Werke Aktiengesellschaft | Kurbeltrieb für eine Hubkolbenmaschine, sowie Hubkolbenmaschine mit einem solchen Kurbeltrieb |
DE102017207644A1 (de) | 2017-05-05 | 2018-11-08 | Ford Global Technologies, Llc | Verfahren zum Verändern eines zylinderzugehörigen Verdichtungsverhältnisses e einer fremdgezündeten Brennkraftmaschine und Brennkraftmaschine zur Durchführung eines derartigen Verfahrens |
CN107201945A (zh) * | 2017-07-21 | 2017-09-26 | 泸州职业技术学院 | 一种可变压缩比发动机 |
EP3486453B1 (de) * | 2017-11-21 | 2020-08-05 | Mark Albert Sokalski | Verbrennungsmotor mit stufenlos regelbarem verdichtungsverhältnis-mechanismus |
DE102018128524B4 (de) | 2018-11-14 | 2022-09-22 | Bayerische Motoren Werke Aktiengesellschaft | Vorrichtung zum Verändern eines Kompressionsverhältnisses, Hubkolbenbrennkraftmaschine und Arbeitsvorrichtung |
DE102020104165A1 (de) | 2020-02-18 | 2021-08-19 | Bayerische Motoren Werke Aktiengesellschaft | Exzenterlagerung für Brennkraftmaschine mit variablem Verdichtungsverhältnis |
DE102020110771A1 (de) | 2020-04-21 | 2021-10-21 | Bayerische Motoren Werke Aktiengesellschaft | Verfahren zum Betreiben einer Brennkraftmaschinenanordnung, insbesondere eines Fahrzeugs |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE583428C (de) * | 1933-09-02 | Albert Zankl | Zusatzgetriebe zum AEndern des Kolbenhubes bei Brennkraftmaschinen | |
DE181913C (de) * | ||||
DE445539C (de) * | 1927-06-15 | Alfred Socha | Viertaktbrennkraftmaschine | |
US1115477A (en) | 1912-10-23 | 1914-11-03 | Walter M Austin | Four-cycle internal-combustion engine. |
FR986605A (fr) * | 1943-11-23 | 1951-08-02 | Dispositif de variation, en marche, du rapport volumétrique d'un moteur | |
US3686972A (en) * | 1970-05-28 | 1972-08-29 | Edward M Mcwhorter | Internal combustion engine variable throw crankshaft |
PL144411B1 (en) * | 1984-11-23 | 1988-05-31 | Politechnika Warszawska | Crank mechanism with variable crank radius for a piston-type internal combustion engine |
US5170757A (en) * | 1991-12-24 | 1992-12-15 | Damien Gamache | Variable horsepower output gearing for piston engine |
PT1360403E (pt) * | 2001-01-24 | 2004-12-31 | Hasan Basri Ozdamar | Motor com perno de biela rotativo |
US7185557B2 (en) * | 2004-06-29 | 2007-03-06 | Thomas Mark Venettozzi | Epitrochoidal crankshaft mechanism and method |
DE102006015887B4 (de) | 2006-04-05 | 2013-06-06 | Bayerische Motoren Werke Aktiengesellschaft | Hubkolben-Brennkraftmaschine |
EP2025893A1 (de) * | 2007-08-09 | 2009-02-18 | Gomecsys B.V. | Hubkolbenmechanismus |
WO2009100759A1 (en) * | 2008-02-13 | 2009-08-20 | Gomecsys B.V. | A reciprocating piston mechanism and a method of increasing internal egr in an internal combustion engine |
DE102008046821B8 (de) * | 2008-09-11 | 2016-10-06 | Audi Ag | Kurbelwelle für eine Brennkraftmaschine mit variabler Verdichtung und Brennkraftmaschine mit variabler Verdichtung |
FI121283B (fi) * | 2009-08-17 | 2010-09-15 | Aulis Pohjalainen | Moottorin sylinteripaineen säädin |
-
2011
- 2011-04-19 DE DE102011018166A patent/DE102011018166A1/de not_active Ceased
-
2012
- 2012-03-22 WO PCT/EP2012/001273 patent/WO2012143078A1/de active Application Filing
- 2012-03-22 EP EP12713879.0A patent/EP2699779A1/de not_active Ceased
-
2013
- 2013-09-10 US US14/022,906 patent/US9249724B2/en active Active
Non-Patent Citations (1)
Title |
---|
See references of WO2012143078A1 * |
Also Published As
Publication number | Publication date |
---|---|
US20140096748A1 (en) | 2014-04-10 |
DE102011018166A1 (de) | 2012-10-25 |
US9249724B2 (en) | 2016-02-02 |
WO2012143078A9 (de) | 2013-09-06 |
WO2012143078A1 (de) | 2012-10-26 |
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Owner name: BAYERISCHE MOTOREN WERKE AKTIENGESELLSCHAFT |
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