EP2764228A1 - Method for the variable adjustment of a compression ratio of a combustion chamber of an internal combustion engine - Google Patents
Method for the variable adjustment of a compression ratio of a combustion chamber of an internal combustion engineInfo
- Publication number
- EP2764228A1 EP2764228A1 EP12756109.0A EP12756109A EP2764228A1 EP 2764228 A1 EP2764228 A1 EP 2764228A1 EP 12756109 A EP12756109 A EP 12756109A EP 2764228 A1 EP2764228 A1 EP 2764228A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- piston
- piston pin
- relative
- pin
- compression ratio
- 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
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
- 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
- the invention relates to a method for variably setting a
- Compression ratio having internal combustion engine, with a first piston part and a second piston part.
- the piston parts are to form an at least first, with a pressure medium, in particular a pressurized fluid,
- 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.
- the compression ratio is assigned to the combustion chamber by means of a device Piston adjusted or adjusted.
- the piston is coupled via respective connecting portions with a piston pin.
- the piston can be connected to a connecting rod of the internal combustion engine.
- the piston pin is received in the respective connecting areas, for example in the piston. Likewise, the piston pin is at least partially added to the connecting rod. Due to the articulated coupling of the piston via the piston pin with the connecting rod, the piston can articulated with a crank shaft rotatably mounted in a crankcase about an axis of rotation relative to the crankcase of the crankshaft
- a rotation of the piston pin assigned to the device is effected for setting the compression ratio.
- the piston pin has at least one with respect to the at least one
- eccentric element accommodated in the connecting rod and at least substantially in the form of a straight circular cylinder is rotated about its longitudinal central axis relative to the connecting rod, and is moved into the connecting rod
- the piston thus has a particularly advantageous noise behavior (NVH behavior).
- NSH behavior noise behavior
- the method according to the invention also enables the very rapid adjustment of the compression ratio, so that the compression ratio can be adapted to different operating points of the internal combustion engine within only a short time.
- the internal combustion engine can be operated efficiently for a particularly long period of time with the demand-based compression ratio, resulting in an efficient and fuel-efficient operation of the
- Mass forces of the moving piston in the combustion chamber and / or as a result of pressure forces in the combustion chamber are not provided and are not required.
- Rotation of the piston pin relative to the piston is rather passive. This keeps the weight and complexity of the internal combustion engine low, so that it has a particularly high functional performance safety.
- crank chamber of the crankcase assigned to the combustion chamber and the piston by means of at least one adjusting element against at least one of the
- crank space subsequent further space in particular crank chamber
- the actuator is, for example, a Schmierölabweiser in the crankcase.
- the lubricating oil deflector is switchable and at least substantially gas-tight, so that the lubricating oil deflector can at least substantially seal the crank chamber.
- Ventilation opening of the crankcase at least substantially lockable and on the other hand is releasable.
- the second position of the actuating element is the
- Ventilation opening obstructed relative to the first position of the actuating element and thus at least substantially gas-tight, resulting in increasing the pressure in the crank chamber of the first position.
- Actuator automatically adjusted from the second to the first position when the pressure in the crank chamber exceeds a threshold. As a result, an undesirably high pressure build-up in the crankcase can be avoided.
- the automatic adjustment of the actuating element is for example realized in such a way that a spring element cooperating with the actuating element is provided.
- Actuator is held under Federkraftbeetzschlagung by the spring element in the second position. If the pressure in the crank chamber reaches or exceeds the predefinable threshold value, then the actuating element is displaced from the second position into the first position by the pressure against the spring force application by the spring element. In the first position, the crank chamber can be vented, so that the pressure in the crank chamber is reduced. Thus, the pressure in the crank chamber drops below the threshold value, the actuator is adjusted under Federkraftbeetzschung by the spring element back into its position in which the crank chamber is sealed compared to the first position against the other room.
- the Internal combustion engine is used as a shift drum to avoid an undesirably high pressure in the crankcase. Also by that is the needs-based
- 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. 7 is another schematic side view of the piston according to FIG. 6;
- FIG. 10 a detail of a further schematic perspective view of the
- 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 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 is in the corresponding
- the piston pin bushing 28 acts as a stop for the piston pin 10 and allows easy installation 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.
- the device 36 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. In 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 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 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 can also be formed as slots serve to receive the lubricating oil on the rotation of the crankshaft 18 and thus on the translational movement of the piston 14 in the cylinder away and guide the
- 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.
- the lubricating oil can flow through the first channel 56 or the second channel 58, too get 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 exiting at the spool 38 from the passage opening 42 when switching oil can be used for cooling.
- the connecting channel of the grooves 48, 50 must ensure the pressure build-up behind the locking bolt and should therefore have no unnecessary leakage to the outside.
- 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 pin 34, a relative rotation of the piston pin 10 to the piston 14 is not prevent more.
- 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 the eccentric arrangement of the eccentric element 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. 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 end face 54) is acted upon by 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 relative rotations of the eccentric bushes to the piston 14 by means of the other
- 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)
- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102011115415A DE102011115415A1 (en) | 2011-10-08 | 2011-10-08 | Method for variably setting a compression ratio of a combustion chamber of an internal combustion engine |
PCT/EP2012/003698 WO2013050098A1 (en) | 2011-10-08 | 2012-09-04 | Method for the variable adjustment of a compression ratio of a combustion chamber of an internal combustion engine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2764228A1 true EP2764228A1 (en) | 2014-08-13 |
EP2764228B1 EP2764228B1 (en) | 2015-04-29 |
Family
ID=46801431
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20120756109 Not-in-force EP2764228B1 (en) | 2011-10-08 | 2012-09-04 | Method for the variable adjustment of a compression ratio of a combustion chamber of an internal combustion engine |
Country Status (6)
Country | Link |
---|---|
US (1) | US20150040870A1 (en) |
EP (1) | EP2764228B1 (en) |
JP (1) | JP2014530319A (en) |
CN (1) | CN103874836A (en) |
DE (1) | DE102011115415A1 (en) |
WO (1) | WO2013050098A1 (en) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103790717B (en) * | 2014-01-26 | 2016-08-24 | 梁荣光 | A kind of internal-combustion engine variable compression ratio device with self-locking structure |
DE102014101929B4 (en) * | 2014-02-17 | 2022-02-24 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | connecting rod and internal combustion engine |
DE102014009484A1 (en) | 2014-06-26 | 2015-12-31 | Daimler Ag | Actuator for variably adjusting at least one compression ratio of a cylinder of a reciprocating engine |
DE102015014887A1 (en) | 2015-11-17 | 2016-07-21 | Daimler Ag | Piston arrangement for a variable compression ratio having combustion chamber of an internal combustion engine |
DE102015015882A1 (en) | 2015-12-08 | 2016-08-11 | Daimler Ag | Piston arrangement for a variable compression ratio having combustion chamber of an internal combustion engine |
DE102015015884A1 (en) | 2015-12-08 | 2016-08-11 | Daimler Ag | Piston arrangement for a variable compression ratio having combustion chamber of an internal combustion engine |
US10247093B2 (en) | 2016-01-21 | 2019-04-02 | Tenneco Inc. | Variable compression ratio connecting rod |
DE102016005973A1 (en) | 2016-05-13 | 2017-02-16 | Daimler Ag | Piston assembly for a variable compression ratio cylinder having a reciprocating engine |
DE102016005950A1 (en) | 2016-05-13 | 2017-02-16 | Daimler Ag | Piston assembly for a variable compression ratio having cylinder in the reciprocating engine |
KR20190126504A (en) * | 2018-05-02 | 2019-11-12 | 현대자동차주식회사 | Variable compression ratio engine |
CN115234399B (en) * | 2022-06-30 | 2024-03-22 | 中国第一汽车股份有限公司 | Variable compression ratio mechanism, engine and vehicle |
Family Cites Families (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0639912B2 (en) * | 1983-12-29 | 1994-05-25 | 本田技研工業株式会社 | Variable compression ratio control device for internal combustion engine for vehicle |
CN85102778A (en) * | 1985-04-01 | 1986-09-10 | 李文华 | Automatically adjust the eccentric stiffener of compression ratio of internal-combustion engine |
JPS61291736A (en) * | 1985-06-20 | 1986-12-22 | Toyota Motor Corp | Eccentric bearing lock mechanism of compression ratio varying mechanism |
JPH0216008Y2 (en) * | 1985-07-05 | 1990-05-01 | ||
JPH0338424Y2 (en) * | 1985-10-25 | 1991-08-14 | ||
US4864977A (en) * | 1987-07-03 | 1989-09-12 | Honda Giken Kogyo Kabushiki Kaisha | Compression ratio-changing device for internal combustion engines |
US4864975A (en) * | 1987-07-03 | 1989-09-12 | Honda Giken Kogyo Kabushiki Kaisha | Compression ratio-changing device for internal combustion engines |
JPH01110845A (en) * | 1987-07-03 | 1989-04-27 | Honda Motor Co Ltd | Variable compression ratio mechanism for internal combustion engine |
DE3807244C1 (en) * | 1988-03-05 | 1989-03-23 | Daimler-Benz Aktiengesellschaft, 7000 Stuttgart, De | |
JPH02163428A (en) * | 1988-12-15 | 1990-06-22 | Mazda Motor Corp | Variable compression ratio mechanism for reciprocating engine |
DE4041637C1 (en) * | 1990-12-22 | 1992-04-09 | Mtu Friedrichshafen Gmbh | |
CA2089815A1 (en) * | 1993-02-18 | 1994-08-19 | John F. E. Beattie | Variable compression piston |
DE60106471T2 (en) * | 2001-12-24 | 2005-02-24 | Visteon Global Technologies, Inc., Dearborn | Crankcase ventilation system |
DE102005055199B4 (en) * | 2005-11-19 | 2019-01-31 | FEV Europe GmbH | Reciprocating internal combustion engine with adjustable variable compression ratio |
JP4430654B2 (en) * | 2005-12-28 | 2010-03-10 | 本田技研工業株式会社 | Variable compression ratio device for internal combustion engine |
JP4748591B2 (en) * | 2006-03-29 | 2011-08-17 | 本田技研工業株式会社 | Engine with breather device |
US7546820B2 (en) * | 2007-10-31 | 2009-06-16 | Ford Global Technologies, Llc | Variable compression ratio engine with lost motion coupling |
JP2010038146A (en) * | 2008-08-08 | 2010-02-18 | Toyota Motor Corp | Engine lubricating device |
AT506470B1 (en) * | 2009-04-29 | 2010-12-15 | Avl List Gmbh | DEVICE FOR MODIFYING THE PISTON KINEMATICS OF AN INTERNAL COMBUSTION ENGINE |
DE102009045172B4 (en) | 2009-09-30 | 2013-11-28 | Faurecia Innenraum Systeme Gmbh | Cable drive and window lift |
KR101114378B1 (en) * | 2009-10-06 | 2012-02-15 | 현대자동차주식회사 | Variable compression ratio device |
-
2011
- 2011-10-08 DE DE102011115415A patent/DE102011115415A1/en not_active Withdrawn
-
2012
- 2012-09-04 WO PCT/EP2012/003698 patent/WO2013050098A1/en active Application Filing
- 2012-09-04 JP JP2014533776A patent/JP2014530319A/en not_active Ceased
- 2012-09-04 EP EP20120756109 patent/EP2764228B1/en not_active Not-in-force
- 2012-09-04 CN CN201280049372.2A patent/CN103874836A/en active Pending
- 2012-09-04 US US14/350,311 patent/US20150040870A1/en not_active Abandoned
Non-Patent Citations (1)
Title |
---|
See references of WO2013050098A1 * |
Also Published As
Publication number | Publication date |
---|---|
US20150040870A1 (en) | 2015-02-12 |
WO2013050098A1 (en) | 2013-04-11 |
DE102011115415A1 (en) | 2013-04-11 |
JP2014530319A (en) | 2014-11-17 |
EP2764228B1 (en) | 2015-04-29 |
CN103874836A (en) | 2014-06-18 |
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