EP2132418A1 - Ventiltrieb für gaswechselventile einer brennkraftmaschine mit verschiebbarem nockenträger und doppelschneckentrieb - Google Patents
Ventiltrieb für gaswechselventile einer brennkraftmaschine mit verschiebbarem nockenträger und doppelschneckentriebInfo
- Publication number
- EP2132418A1 EP2132418A1 EP08716104A EP08716104A EP2132418A1 EP 2132418 A1 EP2132418 A1 EP 2132418A1 EP 08716104 A EP08716104 A EP 08716104A EP 08716104 A EP08716104 A EP 08716104A EP 2132418 A1 EP2132418 A1 EP 2132418A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cam
- groove
- camshaft
- valve drive
- grooves
- 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
- 238000002485 combustion reaction Methods 0.000 title claims description 9
- 238000006073 displacement reaction Methods 0.000 claims description 19
- 101100495769 Caenorhabditis elegans che-1 gene Proteins 0.000 claims 1
- 239000000969 carrier Substances 0.000 abstract description 7
- 230000004913 activation Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 241000792859 Enema Species 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000007920 enema Substances 0.000 description 1
- 229940095399 enema Drugs 0.000 description 1
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 according to the preamble of claim 1.
- 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 mirrored cam tracks disposed at opposite ends of the cam carrier and including a clockwise and a counterclockwise helical groove and two actuators axially spaced in the cylinder head housing of the internal combustion engine , 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 present invention seeks to improve a valve train of the type mentioned in that for the actuators or the cam tracks required axial space and reduce the number of parts to be assembled.
- 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 overall 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 footprint is also smaller than the space required by separate actuators.
- FIG. 1 shows a plan view from above of parts of a valve train for a plurality of intake valves of cylinders of an internal combustion engine with two cam carriers displaceable on a camshaft;
- FIG. 2 shows an end view of the valve drive in the direction of the arrows H-II in FIG. 1;
- FIG. 3 is a longitudinal sectional view of the valvetrain taken along the line III-III of FIG. 2;
- FIG. 4 is a perspective view of a portion of one of the cam carriers with a portion of a worm gear
- Fig. 5a to c schematic side views of the worm drive to explain its operation.
- valve train 1 for four intake valves (not shown) of cylinders of Brennkraftma ⁇ chine with an overhead, rotatably mounted in a cylinder head housing of the engine camshaft 2 can be the hub and the opening times of the two actuated by the camshaft 2 intake valves each Adjust the cylinder.
- the valvetrain 1 for each pair of intake valves, the valvetrain 1 comprises a cam carrier 3 or 4 mounted rotatably and axially displaceably on the camshaft 2, each cam carrier 3, 4 comprising 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.
- the valve drive 1 furthermore comprises, for each of the valves, a hydraulic valve clearance compensation element 12 likewise shown in broken lines in FIG. 2.
- 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 shown in FIG shown.
- 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 extend separately from each other by a corresponding activation of the actuator 21 from a retracted position shown in Fig. 1 and 5 and can be brought into engagement with one of the two grooves 19, 20 to the cam carrier 3, 4 gradually in each case the center distance of two adjacent cams 13, 14 and 14, 15 to move to the left or to the right, as will be explained in more detail below.
- 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 inlet 28 of the two grooves 19, 20 are located respectively in the vicinity of the opposite ends of the section 27 and are each aligned at the same angle of rotation 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 inlet 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 (FIGS. 3 and 5), which is arranged at an angular distance of approximately 180 degrees behind the junction 32 and with respect to the inlets 28 of the two grooves 19, 20 is offset by about 90 degrees in the direction of rotation of the camshaft 2.
- 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 black shown in Fig. 5a central engagement element Extend 23 and bring it with the left-hand groove 20 into engagement.
- the extension of the engagement element 23 takes place before the inlet 28 of the groove 20 moves in the direction of rotation of the camshaft 2 (arrow D in FIG. 5) in front of the engagement element 23, so that its free end at the inlet 28 enters the groove 20 and during a rotation of the camshaft 2 of about 450 degrees through the entire left-hand groove 20 through to the common outlet 35 of the two grooves 19, 20 moves.
- the cam carrier 3, 4 should remain in the middle displacement position, then the central engagement member 23 is retracted and no further engagement member 22, 23, 24 extended more. If, on the other hand, the cam carrier 3, 4 is to be moved beyond the central displacement position to the right in the outer right displacement position shown in FIG. 5 c, the right outer engagement element 24 shown blackened in FIG. 5 b is extended and at the inlet 28 with the left-handed groove 20 brought by which it then moves through to the common outlet 35.
- 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)
Description
Claims
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 true EP2132418A1 (de) | 2009-12-16 |
EP2132418B1 EP2132418B1 (de) | 2011-07-20 |
Family
ID=39628883
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
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 (de) |
EP (1) | EP2132418B1 (de) |
JP (1) | JP5404427B2 (de) |
CN (1) | CN101605967B (de) |
AT (1) | ATE517234T1 (de) |
DE (1) | DE102007010149A1 (de) |
WO (1) | WO2008107111A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102021100183A1 (de) | 2021-01-08 | 2022-07-14 | Schaeffler Technologies AG & Co. KG | Ventiltrieb eines Verbrennungsmotors |
Families Citing this family (62)
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DE102007027979B4 (de) | 2007-06-19 | 2015-07-23 | Audi Ag | Ventiltrieb für Gaswechselventile einer Brennkraftmaschine mit Nockenwellen-Tunnellager |
DE102007037232A1 (de) * | 2007-08-07 | 2009-02-12 | Eto Magnetic Gmbh | Vorrichtung zur Nockenwellenverstellung einer Brennkraftmaschine |
DE102007054978B4 (de) * | 2007-11-17 | 2023-12-14 | Mercedes-Benz Group AG | Ventiltriebvorrichtung |
DE102008029349A1 (de) * | 2008-06-20 | 2009-12-24 | Daimler Ag | Ventiltriebvorrichtung |
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DE102004029622A1 (de) | 2004-06-18 | 2006-01-12 | Dr.Ing.H.C. F. Porsche Ag | Ventilbetätigungselement mit Ventilbetätigungsabschnitten |
DE102004037198A1 (de) * | 2004-07-30 | 2006-03-23 | Ina-Schaeffler Kg | Ventiltrieb einer Brennkraftmaschine |
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DE102008060167B4 (de) * | 2008-11-27 | 2021-05-27 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Ventiltrieb einer Brennkraftmaschine |
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DE102010013216B4 (de) * | 2009-04-04 | 2022-04-28 | Schaeffler Technologies AG & Co. KG | Ventiltrieb einer Brennkraftmaschine |
-
2007
- 2007-03-02 DE DE102007010149A patent/DE102007010149A1/de not_active Withdrawn
-
2008
- 2008-02-28 AT AT08716104T patent/ATE517234T1/de active
- 2008-02-28 JP JP2009551135A patent/JP5404427B2/ja active Active
- 2008-02-28 WO PCT/EP2008/001576 patent/WO2008107111A1/de active Application Filing
- 2008-02-28 EP EP08716104A patent/EP2132418B1/de active Active
- 2008-02-28 CN CN2008800024009A patent/CN101605967B/zh active Active
- 2008-02-28 US US12/529,663 patent/US8365692B2/en active Active
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DE102021100183A1 (de) | 2021-01-08 | 2022-07-14 | Schaeffler Technologies AG & Co. KG | Ventiltrieb eines Verbrennungsmotors |
Also Published As
Publication number | Publication date |
---|---|
EP2132418B1 (de) | 2011-07-20 |
JP2010520395A (ja) | 2010-06-10 |
ATE517234T1 (de) | 2011-08-15 |
CN101605967B (zh) | 2012-07-04 |
US20100269769A1 (en) | 2010-10-28 |
WO2008107111A1 (de) | 2008-09-12 |
CN101605967A (zh) | 2009-12-16 |
US8365692B2 (en) | 2013-02-05 |
DE102007010149A1 (de) | 2008-09-04 |
JP5404427B2 (ja) | 2014-01-29 |
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