EP2132418B1 - Ventiltrieb für gaswechselventile einer brennkraftmaschine mit verschiebbarem nockenträger und doppelschneckentrieb - Google Patents

Ventiltrieb für gaswechselventile einer brennkraftmaschine mit verschiebbarem nockenträger und doppelschneckentrieb Download PDF

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Publication number
EP2132418B1
EP2132418B1 EP08716104A EP08716104A EP2132418B1 EP 2132418 B1 EP2132418 B1 EP 2132418B1 EP 08716104 A EP08716104 A EP 08716104A EP 08716104 A EP08716104 A EP 08716104A EP 2132418 B1 EP2132418 B1 EP 2132418B1
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EP
European Patent Office
Prior art keywords
cam
engagement
groove
handed
camshaft
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.)
Active
Application number
EP08716104A
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German (de)
English (en)
French (fr)
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EP2132418A1 (de
Inventor
Dirk Schöneberg
Jörg Wutzler
Holger Voges
Gero Bromme
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Audi AG
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Audi AG
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Publication date
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Publication of EP2132418A1 publication Critical patent/EP2132418A1/de
Application granted granted Critical
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
    • F01L13/0036—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/047—Camshafts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/18—Rocking arms or levers
    • F01L1/185—Overhead end-pivot rocking arms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/20—Adjusting or compensating clearance
    • F01L1/22—Adjusting or compensating clearance automatically, e.g. mechanically
    • F01L1/24—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically
    • F01L1/2405—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically by means of a hydraulic adjusting device located between the cylinder head and rocker arm
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/047—Camshafts
    • F01L2001/0476—Camshaft bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
    • F01L13/0036—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction
    • F01L2013/0052—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction with cams provided on an axially slidable sleeve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2305/00—Valve arrangements comprising rollers

Definitions

  • the invention relates to a valve train for gas exchange valves of an internal combustion engine.
  • valve trains are known in which the working cycle can be influenced, for example, to allow a speed-dependent change in the opening times or the stroke of the gas exchange valves.
  • the means for axially displacing the cam carrier comprise two worm gears with mirror-inverted cam tracks which are arranged at the opposite ends of the cam carrier and a right-handed and a left-handed helical groove and with two axially mounted in the cylinder head housing of the internal combustion engine actuators , each comprising an engaging element formed as a driving pin, which can be brought by activation of the actuator with the groove of the adjacent curved track in engagement to move the cam carrier to the right or left.
  • the DE 101 48 177 A1 already discloses a valve train in which means for axially displacing a cam carrier comprise a right-handed and a left-handed groove, which are arranged directly adjacent to each other in the cam carrier and merge into one another or unite.
  • the devices further include, for each cam carrier, an engagement member that is engageable with the grooves.
  • the invention has the object to improve a valve train of the type mentioned in that the required for the actuators or the curved paths axial space and the number of parts to be assembled can be reduced.
  • right-handed and left-handed groove in the context of the present invention relate to the sense of rotation of the groove between its inlet, on which an engagement member is brought into engagement with the groove, and its outlet, on which the engagement member is disengaged from the groove again.
  • the pitch of the groove usually extends over a rotational angle of the camshaft of about 180 degrees, corresponding to a base circle portion of the cams and / or cam profiles on the cam carrier, while the grooves also extend over a larger angle of rotation and next to a section with a slope or more in the circumferential direction of the cam carrier extending portions may include.
  • the part of the two grooves located behind the union can be used in both directions of displacement of the cam carrier for engagement of an engagement element, whereby the overall width and thus the required axial space of the cam tracks can be reduced.
  • the separate actuators can be summarized according to a preferred embodiment of the invention to a single actuator with a plurality of engagement elements whose space requirement is also smaller than the space required by separate actuators.
  • valve train 1 for four intake valves (not shown) of cylinders of an internal combustion engine with an overhead, rotatably mounted in a cylinder head housing of the engine camshaft 2, the hub and the opening times of the two actuated by the camshaft 2 intake valves each Adjust the cylinder.
  • the valve train 1 comprises for each pair of intake valves a rotatably and axially displaceably mounted on the camshaft 2 cam carrier 3 and 4, wherein each cam carrier 3, 4 has two axially spaced cam groups 5, 6.
  • Each of the two cam groups 5, 6 cooperates with a roller 7 of a pivotally mounted roller cam follower 8 of one of the valves.
  • About the role 7 is an in Fig. 2 shown in broken lines, provided at the lower end with a valve plate 9 valve member 10 which can be pressed to open the respective valve against the force of a valve spring 11 in the cylinder head down.
  • the valve train 1 further includes a valve also for each of the valves Fig. 2 shown in broken lines hydraulic valve clearance compensation element 12th
  • Each of the two cam groups 5, 6 of each cam carrier 3, 4 has three cams 13, 14, 15, which have different cam contours or cam profiles and by axial displacement of the associated cam carrier 3, 4 on the camshaft 2 optionally with the roller 7 of the finger lever 8 bring the associated valve in abutting contact.
  • the extent of the axial displacement of the cam carrier 3, 4 between two adjacent displacement positions corresponds to the center distance of adjacent cams 13, 14 and 14, 15 or cam profiles.
  • the hollow cylindrical cam carrier 3, 4 To connect the cam carrier 3, 4 rotatably and axially displaceable with the camshaft 2, the hollow cylindrical cam carrier 3, 4 at its inner periphery on a longitudinal toothing, which meshes with a complementary external toothing on the camshaft 2, as in Fig. 2 shown at 16.
  • the axial displacement of the two cam carriers 3, 4 on the camshaft 2 takes place in each case with the aid of a worm drive 17 and is always carried out when a continuous base circle section 18 of the cam groups 5, 6 during a rotation angle of the camshaft 2 of about 180 degrees, the rollers 7 of Drag lever 8 is opposite.
  • Each of the worm gears 17 comprises a right-handed groove 19 and a left-handed groove 20, which are arranged side by side on the right front end of the associated cam carrier 3 and 4 and merge into one another or unite, and a stationary mounted in the cylinder head housing actuator 21 with three engagement elements 22nd , 23, 24, which are separated from each other by appropriate activation of the actuator 21 from a in Fig. 1 and 5 Extend shown retracted position and can be brought into engagement with one of the two grooves 19, 20 to the cam carrier 3. 4 gradually by the center distance of two adjacent cams 13, 14 and 14, 15 to move to the left or to the right, as follows will be explained in more detail.
  • Each of the two grooves 19, 20 has an inlet 28, from which the grooves 19, 20 are gradually deeper and at first extend to each other with the same groove width.
  • the inlets 28 of the two grooves 19, 20 are respectively in the vicinity of the opposite ends of the section 27 and are each aligned at the same rotational angle to the axis of rotation 25, wherein their alignment coincides with the end of the base circle portion 18 of the cam or cam profile groups 5, 6 , From the inlet 28, the two grooves 19, 20 extend approximately at a circumferential angle of about 270 degrees apart, first extending circumferentially about a circumferential angle of about 180 degrees, while one of the cams 13, 14, 15 passes over the roller 7 the associated rocker arm 8 moves.
  • the center axis of the united grooves 19, 20 extends in the circumferential direction of the portion 27, while the opposite outer boundary walls 33, 34 of the unified grooves 19, 20 converge in the direction of rotation of the cam carrier 3, 4 to the end of the base circle portion 18, so that the width of the united grooves 18, 19 at the level of the inlets 28 again corresponds to the width of one of the separate grooves 19 and 20, respectively.
  • the united grooves 19, 20 extend in the circumferential direction to the outlet 35 (FIG. Fig. 3 and 5 ), which is arranged at an angular distance of about 180 degrees behind the junction 32 and offset with respect to the inlets 28 of the two grooves 19, 20 by about 90 degrees in the direction of rotation of the camshaft 2.
  • Fig. 1 how best in Fig. 1 shown, are adjacent engagement elements 22, 23; 23, 24 arranged in the axial direction of the camshaft 2 each in a center distance of adjacent cams 13, 14, 15 and / or cam profiles corresponding distance, which is also the center distance between the inlet 28 of one of the two grooves 19, 20 and the common outlet 35th equivalent.
  • the operation of the worm drive is as follows:
  • the actuator 21 is activated to the in Fig. 5a blackened shown mean engagement element 23 extend and bring it with the left-handed groove 20 into engagement.
  • the extension of the engagement member 23 takes place before the inlet 28 of the groove 20 in the direction of rotation of the camshaft 2 (arrow D in Fig. 5 ) moves in front of the engagement member 23 over, so that its free end at the inlet 28 enters the groove 20 and during rotation of the camshaft 2 of about 450 degrees through the entire left-handed groove 20 through to the common outlet 35 of the two grooves 19, 20 moves.
  • the cam carriers 3 and 4 are each rotatably mounted between two valves in plain bearings 36, which together with the cam carriers 3 , 4 are axially displaceable.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
EP08716104A 2007-03-02 2008-02-28 Ventiltrieb für gaswechselventile einer brennkraftmaschine mit verschiebbarem nockenträger und doppelschneckentrieb Active EP2132418B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007010149A DE102007010149A1 (de) 2007-03-02 2007-03-02 Ventiltrieb für Gaswechselventile einer Brennkraftmaschine mit verschiebbarem Nockenträger und Doppelschneckentrieb
PCT/EP2008/001576 WO2008107111A1 (de) 2007-03-02 2008-02-28 Ventiltrieb für gaswechselventile einer brennkraftmaschine mit verschiebbarem nockenträger und doppelschneckentrieb

Publications (2)

Publication Number Publication Date
EP2132418A1 EP2132418A1 (de) 2009-12-16
EP2132418B1 true EP2132418B1 (de) 2011-07-20

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Family Applications (1)

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EP08716104A Active EP2132418B1 (de) 2007-03-02 2008-02-28 Ventiltrieb für gaswechselventile einer brennkraftmaschine mit verschiebbarem nockenträger und doppelschneckentrieb

Country Status (7)

Country Link
US (1) US8365692B2 (ja)
EP (1) EP2132418B1 (ja)
JP (1) JP5404427B2 (ja)
CN (1) CN101605967B (ja)
AT (1) ATE517234T1 (ja)
DE (1) DE102007010149A1 (ja)
WO (1) WO2008107111A1 (ja)

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DE102013100632A1 (de) 2013-01-22 2014-07-24 Lsp Innovative Automotive Systems Gmbh Variable elektrohydraulische Ventilsteuerung
US12031460B2 (en) 2020-08-12 2024-07-09 Thyssenkrupp Dynamic Components Gmbh Sliding cam system
US12071869B2 (en) 2019-03-25 2024-08-27 Thyssenkrupp Presta Teccenter Ag Slide cam system and motor

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AT6651U1 (de) * 2003-06-24 2004-01-26 Avl List Gmbh Variable ventiltriebsvorrichtung für eine brennkraftmaschine
EP1503048B1 (de) * 2003-07-19 2008-10-08 Dr. Ing. h.c. F. Porsche Aktiengesellschaft Ventiltrieb für eine Brennkraftmaschine
DE102004008670B4 (de) * 2004-02-21 2013-04-11 Schaeffler Technologies AG & Co. KG Ventiltrieb mit Nockenumschaltung für die Gaswechselventile eines 4-Takt-Verbrennungsmotors
DE102004029622A1 (de) * 2004-06-18 2006-01-12 Dr.Ing.H.C. F. Porsche Ag Ventilbetätigungselement mit Ventilbetätigungsabschnitten
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DE102013100632A1 (de) 2013-01-22 2014-07-24 Lsp Innovative Automotive Systems Gmbh Variable elektrohydraulische Ventilsteuerung
US12071869B2 (en) 2019-03-25 2024-08-27 Thyssenkrupp Presta Teccenter Ag Slide cam system and motor
US12031460B2 (en) 2020-08-12 2024-07-09 Thyssenkrupp Dynamic Components Gmbh Sliding cam system

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US8365692B2 (en) 2013-02-05
DE102007010149A1 (de) 2008-09-04
CN101605967A (zh) 2009-12-16
JP5404427B2 (ja) 2014-01-29
JP2010520395A (ja) 2010-06-10
ATE517234T1 (de) 2011-08-15
WO2008107111A1 (de) 2008-09-12
US20100269769A1 (en) 2010-10-28
CN101605967B (zh) 2012-07-04
EP2132418A1 (de) 2009-12-16

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