EP1085185A2 - Dispositif et procédé pour varier le taux de compression d' un moteur à combustion interne - Google Patents

Dispositif et procédé pour varier le taux de compression d' un moteur à combustion interne Download PDF

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Publication number
EP1085185A2
EP1085185A2 EP00118203A EP00118203A EP1085185A2 EP 1085185 A2 EP1085185 A2 EP 1085185A2 EP 00118203 A EP00118203 A EP 00118203A EP 00118203 A EP00118203 A EP 00118203A EP 1085185 A2 EP1085185 A2 EP 1085185A2
Authority
EP
European Patent Office
Prior art keywords
sleeve
connecting rod
crankshaft
working chamber
bearing shell
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Withdrawn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
EP00118203A
Other languages
German (de)
English (en)
Other versions
EP1085185A3 (fr
Inventor
Manfred Dipl.-Ing. Kloft
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.)
Volkswagen AG
Original Assignee
Volkswagen 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 Volkswagen AG filed Critical Volkswagen AG
Publication of EP1085185A2 publication Critical patent/EP1085185A2/fr
Publication of EP1085185A3 publication Critical patent/EP1085185A3/fr
Withdrawn legal-status Critical Current

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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

Definitions

  • the invention relates to a device for changing the compression of a Reciprocating internal combustion engine according to the preamble of claim 1.
  • DE 197 03 948 C1 discloses a device with a connecting rod, in the a large connecting rod eye associated with a crankshaft rotatably arranged a sleeve is.
  • the sleeve has a crankshaft through opening arranged eccentrically to the large connecting rod eye on.
  • the compression of the reciprocating internal combustion engine is by a Change the rotational position of the sleeve possible, the sleeve in the respective Rotational position can be locked by means of a locking member.
  • the twist of the sleeve takes place automatically after release by the locking member on the basis of it by the rotation of the crankshaft or the oscillating movement of the Connecting rod forces.
  • the disadvantage is that often a rapid rotation of the Sleeve in a defined rotational position is not done in the desired manner.
  • a gear pump in the connecting rod integrate a toothed wheel which engages in a toothing provided on the sleeve includes.
  • the disadvantage here is the large manufacturing effort and the costs for this additional parts.
  • DE 31 27 760 A1 discloses a device in which the rotation of the large connecting rod eye arranged, an eccentric compared to the large connecting rod eye Crankshaft passage opening sleeve using a fixed to the sleeve connected push rod, which is guided in a sliding guide. An adjustment the sliding guide to another position causes the sleeve to twist.
  • the Design of this mechanical actuating device is very complex and thus expensive.
  • a device having the features of claim 1 suggested having the features of claim 1 suggested.
  • This is characterized in that the sleeve or the connecting rod for Rotation of the sleeve at least one pressurizable with a pressure medium Has working chamber.
  • the sleeve is thus twisted by the insertion a medium under pressure, for example pressure oil from the Engine lubricating oil circuit, in the working chamber.
  • the working chamber has the function of a cylinder, while the piston cooperating with the cylinder by one fixed part on the connecting rod or connecting rod or on the sleeve or sleeve is formed.
  • the sleeve has the working chamber, takes place when the pressure medium is applied to the working chamber Relative movement of the cylinder in relation to the piston.
  • the device is characterized by a simple and therefore inexpensive construction and high functional reliability. It is also advantageous that the device has practically no wear has underlying components. Furthermore, the space requirement and the weight of the Device preferably only very little.
  • the working chamber of one the function of a piston fixed with respect to the connecting rod or the sleeve having the stop is completed.
  • the stop is the rotary position the sleeve can be fixed with respect to the connecting rod, the sleeve in at least two Rotational positions can be rotated. Due to the double function of as a piston and as The position of the stop which serves to fix the rotational position can be the construction of the device be simplified.
  • an embodiment of the device is preferred, which is characterized by characterized in that the crankshaft has at least one channel for the pressure medium, the at least within a crankshaft rotational position range in the working chamber flows. With each revolution of the crankshaft, at least one passes over the Crankshaft through opening through connecting rod bearing pin provided Channel opening the working chamber with the pressure medium, whereby the Medium of the working chamber in increments in certain, from the rotational position of the Crankshaft dependent intervals supplied or from the working chamber can be applied.
  • an annular groove or the like between the channel and the working chamber in any rotational position of the Crankshaft is a medium connection, so that the medium continuously in the Work chamber initiated or can be transported out of this.
  • an embodiment of the device in which in seen in the radial direction of the crankshaft a further working chamber on the sleeve or the connecting rod is designed to reverse the sleeve.
  • the sleeve is thus designed to be pivotable, that is to say when one is pressurized the working chambers the sleeve turns clockwise and when pressurized the other working chamber in the opposite direction about the longitudinal central axis of the large connecting rod eye pivoted. This is a hydraulic only Averaged twisting of the sleeve is possible.
  • FIG. 1 shows an embodiment of a device 1 in a perspective view to change the compression of a reciprocating internal combustion engine, namely a Connecting rod 3, which has a small connecting rod eye 5 for mounting a piston pin and a large one Connecting rod eye 7 for supporting a connecting rod bearing journal of a crankshaft.
  • the Connecting rod 3 is in two parts to form a split bearing for the connecting rod bearing journal formed and comprises a connecting rod upper part 9 and a connecting rod lower part 11, which means by not shown fasteners are releasably connectable.
  • the big connecting rod eye 7 is a two-part sleeve 13 is arranged, the first bearing shell 15 and one second bearing shell 17.
  • the preferably made of steel, at her Inner circumference coated with a bearing material sleeve 13 has a crankshaft through opening 19, which is arranged eccentrically to the large connecting rod eye 7.
  • the Bearing shells 15, 17 of the sleeve 13 rotatable in the connecting rod eye 7 are on it Outside shaped differently, which will be discussed in more detail below.
  • FIG. 4 shows a perspective illustration of the one described with reference to FIG. 1 first bearing shell 15 of the sleeve 13, the outer contour partially to the Inner contour of the large connecting rod eye 7 is adapted.
  • the inner contour of the connecting rod eye 7 is uniform over its entire circumference, as can be seen from FIGS. 2 and 3, each of which is a perspective view of the connecting rod upper part 9 or the connecting rod lower part 11 emerges without the sleeve 13.
  • FIGS. 2 and 3 each of which is a perspective view of the connecting rod upper part 9 or the connecting rod lower part 11 emerges without the sleeve 13.
  • FIGS. 2 and 3 each of which is a perspective view of the connecting rod upper part 9 or the connecting rod lower part 11 emerges without the sleeve 13.
  • Appropriately adapted grooves 21 are introduced with different depths, whereby a first bearing shoulder 23 and a second bearing shoulder 25 are formed.
  • the first bearing shell 15 contact surfaces 27 and 27 'with which they are in the assembled state abuts
  • Figure 5 shows a perspective view of the second bearing shell 17 of the sleeve 13 obliquely from above.
  • the second bearing shell 17 is completely adapted on its outer contour to the inner contour of the large connecting rod eye 7, like the first bearing shell 15, and has stop surfaces 29 and 29 ', which in the assembled state of the sleeve 13 on the contact surface 27 and 27' of the first Bearing shell 15 abut.
  • stop surfaces 29, 29 ' open-edge depressions 31 and 31' are provided, which are provided for distributing a printing medium.
  • the stop surfaces 29, 29 also act the second bearing shell 17 together with a stop 35 shown in Figure 3, which is formed here by a stop plate 37.
  • the stop plate 37 is arranged between the upper and lower connecting rod parts and has stop surface regions 38 and 38 'protruding into the connecting rod eye 7, shown in dashed lines in FIG. 3, which interact with the stop surfaces 29, 29' of the second bearing shell 17.
  • the top 49 of one of the stop surface areas 38, 38 ′ forms a first piston surface for a first working chamber 45, which is formed between the outer back of the first bearing shell 15 and the connecting rod lower part 11.
  • the underside 50 of the other stop surface area forms a second piston surface for a second working chamber 47, which is formed between the outer back of the first bearing shell 15 and the connecting rod upper part 9.
  • the sleeve is 13 Can be rotated by approximately 175 ° in the connecting rod eye 7, the two rotational positions of the sleeve 13 are determined by the stop 35.
  • the Angular range of the sleeve 13 determined by the thickness of the stop 35.
  • the second bearing shell 17 strikes with a their stop surfaces 29, 29 'from above against the stop 35 or the Stop surface areas 38, 38 'and in the other, opposite the first rotational position rotated clockwise by approximately 175 ° from the bottom against the Stop surface areas 38, 38 '.
  • annular groove sections 41 and 43 are introduced, which extend in the circumferential direction of the crankshaft penetration opening 19 and extend through the stop surfaces 29, 29 'into the respective recess 31, 31'.
  • the annular groove sections 41, 43 form collecting chambers which can be acted upon by a pressure medium.
  • the cavity located in the assembled state between the bearing shell 15 and the connecting rod lower part 11 and the connecting rod upper part 9 represents the working chamber 45 and 47, respectively.
  • the working chambers 45, 47 are circumferential by the stop plate 37 and the stop surfaces 29, 29 or the depressions 31, 31 limited.
  • the working chambers 45, 47 are with pressure oil can be loaded from the engine lubricating oil circuit, the working chambers 45, 47 have separate pressurized oil supplies.
  • the pressure oil supply for example via a multi-way valve, not shown in the figures, and two main oil galleries in a crankcase receiving the crankshaft with tap holes to the Main crankshaft bearings realized.
  • the crankshaft main bearings are above each at least one channel in the crankshaft with the connecting rod bearing journals and arranged in this channel openings with the working chambers 45, 47 in Flow connection.
  • the device 1 also includes one shown in Figures 1 and 6 Locking element 51, which is arranged here on the connecting rod lower part 11 and serves to to secure the sleeve 13 against twisting in its two rotational positions.
  • the Locking element 51 comprises a fixedly connected to a piston 53 Locking bolt 55, in the embodiment shown in Figure 1 perpendicular to the longitudinal central axis of the connecting rod eye 7 or Longitudinal rod axis arranged and displaceable in the direction of a double arrow 57.
  • Locking bolt 55 engages in one of the circumferences the first bearing shell 15 introduced through openings 59, 61 and into a through opening 60 in the second bearing shell 17 (FIG. 5).
  • a second functional position is the locking bolt 55 from the through opening moved out so that the sleeve 13 is rotatable.
  • the locking bolt 55 In which of the circumferential direction the bearing shell 15 at a distance of approximately 5 ° arranged through openings 59, 61 the locking bolt 55 is retractable to prevent rotation of the sleeve 13 depending on the respective rotational position of the sleeve 13.
  • the piston 53 divides one Cylinder 63 in two working spaces 65 and 67, of which the working space 65 with one Pressure medium, for example pressure oil from the engine lubricating oil circuit, can be acted upon is.
  • a spring element 69 formed by a compression spring arranged, which falls below a certain pressure in the work space 65 den Piston 53 displaced within the cylinder 63 so that the locking bolt 55 of the sleeve 13 is displaced and, if necessary, out of one of the through openings 59, 60, 61 is pulled out.
  • this is Locking element arranged parallel to the axis of rotation of the crankshaft and engages in one in one of the bearing shoulders of the two bearing shells 15, 17 of the sleeve 13 introduced recess.
  • the rotational position of the sleeve 13 shown in FIG. 1 corresponds to the minimum compression of the reciprocating piston internal combustion engine.
  • This Rotational position abuts the second bearing shell 17 against the stop 35 from above
  • the one pressure chamber 47 with pressure oil acts, whereby the sleeve 13 is pushed away from the stop 35 until it has reached its other rotational position in which the second bearing shell 17 from below strikes the stop 35.
  • the device 1 described with reference to the figures is characterized in particular by a cost-effective construction and also has a high level of functional reliability.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
EP00118203A 1999-09-17 2000-08-31 Dispositif et procédé pour varier le taux de compression d' un moteur à combustion interne Withdrawn EP1085185A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1999144668 DE19944668A1 (de) 1999-09-17 1999-09-17 Vorrichtung zur Veränderung der Verdichtung einer Hubkolbenbrennkraftmaschine
DE19944668 1999-09-17

Publications (2)

Publication Number Publication Date
EP1085185A2 true EP1085185A2 (fr) 2001-03-21
EP1085185A3 EP1085185A3 (fr) 2002-02-06

Family

ID=7922420

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00118203A Withdrawn EP1085185A3 (fr) 1999-09-17 2000-08-31 Dispositif et procédé pour varier le taux de compression d' un moteur à combustion interne

Country Status (2)

Country Link
EP (1) EP1085185A3 (fr)
DE (1) DE19944668A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2370090A (en) * 2000-10-18 2002-06-19 Ford Global Tech Inc A variable length connecting rod assembly
GB2370072A (en) * 2000-10-18 2002-06-19 Ford Global Tech Inc Apparatus for varying the compression ratio of an internal combustion engine by adjusting the length of the connecting rod assembly
EP2801713A1 (fr) * 2013-05-07 2014-11-12 Wärtsilä Schweiz AG Moteur à combustion interne à piston alternatif et appareil et procédé de commande d'un tel moteur
WO2016026488A1 (fr) * 2014-08-20 2016-02-25 Schaeffler Technologies AG & Co. KG Dispositif de modification du taux de compression d'une unité de cylindre d'un moteur alternatif à combustion interne

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10218740A1 (de) * 2002-04-26 2003-11-13 Bayerische Motoren Werke Ag Vorrichtung zur Veränderung eines Verdichtungsverhältnisses einer Hubkolben-Brennkraftmaschine
DE10218744A1 (de) * 2002-04-26 2003-11-13 Bayerische Motoren Werke Ag Vorrichtung zur Veränderung eines Verdichtungsverhältnisses einer Hubkolben-Brennkraftmaschine
DE10230429A1 (de) * 2002-07-06 2004-01-15 Bayerische Motoren Werke Ag Exzenter-Verstellvorrichtung für einen Kurbeltrieb
DE10230428A1 (de) * 2002-07-06 2004-01-15 Bayerische Motoren Werke Ag Exzenter-Verstellvorrichtung für einen Kurbeltrieb
DE102013021635A1 (de) 2013-12-18 2015-06-18 Daimler Ag Hubkolben-Verbrennungskraftmaschine

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2251456A (en) * 1991-01-05 1992-07-08 Ford Motor Co I.c. engine with variable compression ratio
DE4226361A1 (de) * 1992-08-10 1994-04-07 Alex Zimmer Brennkraftmaschine

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4140091A (en) * 1977-03-09 1979-02-20 Showers Jr Lewis M Uniform compression piston engine
DE3127760A1 (de) * 1981-07-14 1983-03-03 Günter 4600 Dortmund Olbrisch Hubkolben-brennkraftmaschine mit regelbarem, veraenderlichen verdichtungsverhaeltnis
JPH0828314A (ja) * 1994-07-13 1996-01-30 Honda Motor Co Ltd 内燃機関の可変圧縮比装置
DE19703948C1 (de) * 1997-02-03 1998-06-18 Meta Motoren Energietech Vorrichtung zur Veränderung der Verdichtung einer Hubkolbenbrennkraftmaschine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2251456A (en) * 1991-01-05 1992-07-08 Ford Motor Co I.c. engine with variable compression ratio
DE4226361A1 (de) * 1992-08-10 1994-04-07 Alex Zimmer Brennkraftmaschine

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2370090A (en) * 2000-10-18 2002-06-19 Ford Global Tech Inc A variable length connecting rod assembly
GB2370072A (en) * 2000-10-18 2002-06-19 Ford Global Tech Inc Apparatus for varying the compression ratio of an internal combustion engine by adjusting the length of the connecting rod assembly
GB2370072B (en) * 2000-10-18 2004-09-01 Ford Global Tech Inc Apparatus for varying the compression ratio of an internal combustion engine
EP2801713A1 (fr) * 2013-05-07 2014-11-12 Wärtsilä Schweiz AG Moteur à combustion interne à piston alternatif et appareil et procédé de commande d'un tel moteur
WO2016026488A1 (fr) * 2014-08-20 2016-02-25 Schaeffler Technologies AG & Co. KG Dispositif de modification du taux de compression d'une unité de cylindre d'un moteur alternatif à combustion interne
US10184408B2 (en) 2014-08-20 2019-01-22 Schaeffler Technologies AG & Co. KG Device for changing a compression ratio of a cylinder unit of a reciprocating-piston internal combustion engine

Also Published As

Publication number Publication date
EP1085185A3 (fr) 2002-02-06
DE19944668A1 (de) 2001-03-22

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