EP2464834A2 - Ventiltrieb für brennkraftmaschinen zur betätigung von gaswechselventilen - Google Patents
Ventiltrieb für brennkraftmaschinen zur betätigung von gaswechselventilenInfo
- Publication number
- EP2464834A2 EP2464834A2 EP10760230A EP10760230A EP2464834A2 EP 2464834 A2 EP2464834 A2 EP 2464834A2 EP 10760230 A EP10760230 A EP 10760230A EP 10760230 A EP10760230 A EP 10760230A EP 2464834 A2 EP2464834 A2 EP 2464834A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- cam
- camshaft
- switching
- cam carrier
- internal combustion
- 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
- 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
- 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
Definitions
- Valve train for internal combustion engines for actuating gas exchange valves
- the invention relates to a valve train for internal combustion engines for actuating gas exchange valves with the features mentioned in the preamble of claim 1.
- the disadvantage here is the high space requirement, which is needed to adjust the cam carrier. These solutions are therefore only applicable at relatively large cylinder spacings to accommodate the corresponding components can. Another disadvantage is the high mass forces that occur during the adjustment process, which are needed to move the cam carrier or the adjusting organs. Switching over to a corresponding cam contour can only be done in a cylinder-selective manner. Valve-selective switching is not possible.
- DE 100 54 623 A1 describes a device for switching a cam carrier on a camshaft for actuating gas exchange valves, in which the cam carrier is guided axially displaceably on the camshaft. According to the position of the cam carrier, the gas exchange valve is in operative connection with different cam contours.
- the control element is a radially outwardly displaceable pin, which is connected to at least two in a by about 180 ° around the cam carrier arranged around guide part formed link tracks in the extended state cooperates.
- a disadvantage of this solution in addition to the additional space for the guide member is that extended to switch to another cam contour of the pin from the camshaft and must be meshed in an axially displaceable shift gate. After switching, the pin must be retracted. This design is very part and production-consuming and there is a risk of damage to the camshaft by faulty circuits of the pin.
- Another disadvantage is that the motor speed is limited by the necessary actuating time of the pin. In addition, the adjustment depends on the existing oil pressure.
- a valve train of an internal combustion engine previously known in which on the camshaft rotationally fixed an axially displaceable cam carrier is arranged with at least two different cam tracks.
- the adjustment of the cam carrier via an adjusting member which is guided inside the camshaft.
- the wave-like adjusting member is moved in the interior of the camshaft against the pressure of a spring.
- the adjusting member is connected to a driving piece, which penetrates an axially arranged in the camshaft slot and opens into a bore of the cam carrier.
- the disadvantage of this solution is that only a plurality of cam carriers arranged on the cam carrier can be moved simultaneously by the axial displacement of the adjusting. A different circuit of individual Nockenträgem on a camshaft is not possible.
- Another disadvantage is that at a switching position in which an outer cam is engaged with the gas exchange valves, the spring element is constantly stretched. As a result, high lateral frictional forces occur between the driving piece and the guideway arranged on the adjusting member. An increased wear and associated possible faulty circuits are the result.
- a further disadvantage is that the acting spring forces must be set accurately in order to avoid faulty circuits, in particular This is to avoid when switching back to the central cam profile with three different cam profiles.
- valve drive for actuating gas exchange valves of internal combustion engines.
- the displacement of the cam carrier for valve switching on the camshaft tube is effected by a rotatable switching shaft arranged in the interior of the camshaft tube.
- the switching shaft is provided with a switching contour having an axial slope.
- a switching ball is guided, which is mounted in a bore of a switching shaft surrounding the axially displaceable shift sleeve.
- the switching sleeve is connected via a driver with the cam carrier in operative connection.
- the invention has for its object to provide a valve train for actuating gas exchange valves of internal combustion engines, which is characterized by a simplified structure while reducing the friction forces occurring.
- the valve drive for actuating the gas exchange valves consists of a tubular camshaft, which is driven by a crankshaft of the internal combustion engine.
- On the camshaft tube one or more non-rotatable but axially displaceable cam carrier are arranged, each having a same base circle portion with a plurality of different cam profiles. By shifting the cam carrier, the cam profiles can be brought into operative connection with the gas exchange valves.
- the displacement of the cam carrier to the valve switching on the camshaft tube is carried out according to the invention by a in the interior of the No camshaft tube arranged and co-rotating with the camshaft tube switching shaft which is operatively connected via a driving in a shifting contour on the shift shaft driver with an axially displaceable on the camshaft tube cam carrier.
- the switching shaft is connected via a gear with a non-rotatably on the cam sleeve but axially displaceable sliding piece, which is operable to actuate the switching shaft with an actuator for generating a Relatiwerpitung the shift shaft relative to the camshaft tube in operative connection.
- the advantage of the solution according to the invention consists in a simple design of the actuator for safe valve switching between different cam profiles of the camshaft at the same time the friction occurring between the individual components has been reduced.
- Fig. 1 a sectional view of the solution according to the invention.
- Fig. 2 a variant of the solution according to the invention as a detail in a half-sectional view.
- FIG. 1 a portion of a valve train of an internal combustion engine is shown in section.
- the valve drive for actuating gas exchange valves consists of a driven by a crankshaft of the internal combustion engine camshaft, which is designed as a camshaft tube 8.
- camshaft tube 8 On the camshaft tube 8 rotatably, but axially displaceably cam carrier 7 are arranged.
- Each cylinder of a multi-cylinder internal combustion engine is associated with an axially displaceable cam carrier 7, with which, according to the embodiment, two gas exchange valves of a cylinder can be actuated by the two cam profiles 9 arranged on the cam carrier 7.
- the cam carrier 7 has at a same base circle section 10 several different cam profile 9a, 9b and 9c, which are brought to Ventilhubumsciens either by moving the cam carrier 7 respectively directly or via non-illustrated intermediate members with a respective gas exchange valve in contact.
- the cam carrier 7 has three different cam profiles, a large cam profile 9c, a middle cam profile 9b, and a small cam profile 9a. It is quite conceivable that the cam carrier 7 has only two or more than three different cam profiles 9. To achieve a phase shift between the different cam profiles 9a, 9b and 9c, the curves of the cam profiles 9a, 9b and 9c can be arranged offset to one another.
- a switching shaft 1 is arranged, which, except during the switching process, rotates synchronously with the camshaft tube 8 and the axially displaceable cam carriers 7 located thereon.
- an opening 16 is arranged in the camshaft tube 8 for each driver. The width of the opening 16 corresponds at least to the maximum axial displacement of the cam carrier 7.
- the driver 3 is on the one hand firmly connected to the cam carrier 7 and on the other hand it is slidably mounted in a arranged on the surface of the switching shaft 1 circumferential switching contour 2. Due to the fixed connection of the driver 3 with the cam carrier 7 and the lateral guidance of the driver 3 in the opening 16 in the camshaft tube 8, the non-rotatable but axially displaceable mounting of the cam carrier 7 takes place on the camshaft tube 8. At the same time via the driver 3, the torque transmission from the camshaft tube 8 to the cam carriers 7.
- the arranged on the surface of the switching shaft 1 for each cam carrier 7 switching contour 2 is provided with an axial slope. Due to the axial pitch, a spiral-shaped switching contour 2 is produced on the surface of the switching shaft 1, whose respective beginning on the switching shaft 1, in accordance with the prevailing taking axial displacements of the individual cam carrier 7, the same or circumferentially offset from one another. In a successive axial displacement of the individual cam carrier 7, the individual axial slopes of the arranged for each cam carrier 7 switching contour 2 are arranged offset from one another on the circumference of the switching shaft 1. In the figure 1, this variant is shown. In a simultaneous axial displacement of the individual cam carrier 7, the individual axial slopes of the arranged for each cam carrier 7 switching contour 2 on the circumference of the switching shaft 1 in the same axial plane.
- the shift shaft 1 is shown in FIG 1 via a threaded spindle 4 with a rotatably on the camshaft tube 8 but axially displaceable sliding piece 5 is connected.
- the connection between the camshaft tube 8 and the sliding piece 5 takes place via an intermeshing axial toothing 13.
- the threaded spindle 4 of the switching shaft 1 is formed as a helical toothing and engages in the correspondingly formed toothing of the sliding piece 5 a.
- the sliding piece 5 can be brought into operative connection with a housing of the internal combustion engine firmly connected actuator 6.
- a pin 11 arranged on the actuator 6 engages in the contour 12 arranged on the circumference of the displacement piece 5.
- the sliding piece 5 is axially displaceable on the camshaft tube 8 in both directions according to the double arrow shown in the drawing.
- FIG. 2 shows a variant of the connection of the switching shaft 1 with the sliding piece 5 which is axially displaceable on the camshaft tube 8.
- the connection of the shift shaft 1 with the sliding piece 5 takes place here via a cam mechanism.
- the cam mechanism consists of a arranged on the circumference of the switching shaft 1 switching contour 14 in the sliding a switching ball 15 is mounted, which in turn is mounted in a arranged on the inner circumference of the sliding piece 5 hemispherical receptacle.
- the displacement of the sliding piece 5 is also effected by an actuator 6.
- variable valve train for realizing a changeover between the different cam profiles 9a, 9b and 9c is as follows.
- the central cam profiles 9b of the cam carrier 7 with the gas exchange valves, the camshaft tube 8, the cam carrier 7, the switching shaft 1 and the sliding piece 5 rotate at a synchronous speed.
- the actuator 6 is not engaged with the sliding piece 5.
- a changeover to another cam profile can only be performed when the base circle portion 10 is in engagement with the gas exchange valve or the intermediate member.
- the actuator 6 is activated by a corresponding control and brought into engagement with the sliding piece 5.
- the sliding piece 5 is axially displaced on the camshaft tube 8 by the pin 11 sliding in the contour 12 to the right or to the left, according to the switching operation to be performed.
- the axial movement of the sliding piece 5 is translated into a rotation of the switching shaft 1.
- Relatiwerdusung slides the hemispherically shaped part of the driver 3 in the path of the switching contour 2.
- the displacement of the sliding piece 5 can also be effected, for example, by an actuator 6 that acts magnetically on the sliding piece 5.
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)
- Mechanically-Actuated Valves (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102009037270A DE102009037270B4 (de) | 2009-08-10 | 2009-08-10 | Ventiltrieb für Brennkraftmaschinen zur Betätigung von Gaswechselventilen |
PCT/DE2010/000931 WO2011018074A2 (de) | 2009-08-10 | 2010-08-03 | Ventiltrieb für brennkraftmaschinen zur betätigung von gaswechselventilen |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2464834A2 true EP2464834A2 (de) | 2012-06-20 |
EP2464834B1 EP2464834B1 (de) | 2013-07-24 |
Family
ID=43524910
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10760230.2A Not-in-force EP2464834B1 (de) | 2009-08-10 | 2010-08-03 | Ventiltrieb für brennkraftmaschinen zur betätigung von gaswechselventilen |
Country Status (5)
Country | Link |
---|---|
US (1) | US8746194B2 (de) |
EP (1) | EP2464834B1 (de) |
JP (1) | JP5649238B2 (de) |
DE (1) | DE102009037270B4 (de) |
WO (1) | WO2011018074A2 (de) |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102008029349A1 (de) * | 2008-06-20 | 2009-12-24 | Daimler Ag | Ventiltriebvorrichtung |
DE102008029325A1 (de) * | 2008-06-20 | 2009-12-24 | Daimler Ag | Ventiltriebvorrichtung |
DE102009037268B3 (de) | 2009-08-10 | 2011-04-07 | Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr | Variabler Ventiltrieb für Brennkraftmaschinen zur Betätigung von Gaswechselventilen |
DE102009037269B4 (de) | 2009-08-10 | 2011-06-01 | Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr | Ventiltrieb für Verbrennungskraftmaschinen zur Betätigung von Gaswechselventilen |
DE102011108728B4 (de) * | 2011-07-27 | 2013-02-07 | Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr | Ventiltrieb für Brennkraftmaschinen zur Betätigung von Gaswechselventilen |
DE102011109256B4 (de) * | 2011-08-02 | 2015-11-19 | Audi Ag | Ventiltrieb einer Brennkraftmaschine sowie Brennkraftmaschine |
DE102011054218B4 (de) * | 2011-10-06 | 2023-03-23 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Brennkraftmaschine und Ventiltrieb für eine Brennkraftmaschine |
DE102011116117B4 (de) * | 2011-10-15 | 2023-11-09 | Mercedes-Benz Group AG | Ventiltriebvorrichtung für eine Brennkraftmaschine |
DE102011116653B4 (de) | 2011-10-21 | 2023-11-09 | Mercedes-Benz Group AG | Ventiltriebvorrichtung |
DE102012008555B4 (de) * | 2012-04-27 | 2014-11-27 | Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr | Vorrichtung für einen Ventiltrieb zum Umschalten des Hubs von Gaswechselventilen einer Brennkraftmaschine |
US9605603B2 (en) * | 2013-04-05 | 2017-03-28 | Ford Global Technologies, Llc | Position detection for lobe switching camshaft system |
US20160246837A1 (en) * | 2015-02-25 | 2016-08-25 | Nokia Technologies Oy | Methods, apparatuses and computer program products for enabling intelligent merging of modified data |
DE112016004372T5 (de) | 2015-11-06 | 2018-06-07 | Borgwarner Inc. | Ventilbetätigungssystem, das einen variablen ventilhub und/oder variable ventilzeitsteuerung bereitstellt |
Family Cites Families (27)
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US3481314A (en) | 1967-08-29 | 1969-12-02 | Georges G Lecrenn | Means for optimizing the performance of internal combustion engines |
DE3934848A1 (de) * | 1989-10-19 | 1991-04-25 | Ingelheim Peter Graf Von | In zwei und mehr groessen separat mit nur einem regelorgan verstellbare nockenwelle |
DE4230877A1 (de) | 1991-09-30 | 1993-04-01 | Volkswagen Ag | Ventilsteuerung fuer ein hubventil mit zwei nocken |
AT408127B (de) | 1992-07-13 | 2001-09-25 | Avl Verbrennungskraft Messtech | Brennkraftmaschine mit mindestens einer durch eine verstellvorrichtung axial verschiebbaren nockenwelle |
DE4331977A1 (de) | 1993-09-21 | 1995-03-23 | Porsche Ag | Variable Ventilsteuerung |
DE4416505A1 (de) * | 1994-05-10 | 1995-11-16 | Bayerische Motoren Werke Ag | Nockenwelle mit verdrehbaren Nocken |
DE19520117C2 (de) | 1995-06-01 | 2002-04-11 | Porsche Ag | Ventiltrieb einer Brennkraftmaschine |
JPH10280930A (ja) * | 1997-04-09 | 1998-10-20 | Toyota Motor Corp | 多気筒内燃機関の動弁装置 |
DE19825307A1 (de) | 1998-06-05 | 1999-12-09 | Bayerische Motoren Werke Ag | Ventilsteuerung für eine Brennkraftmaschine |
JP2002004823A (ja) * | 2000-06-23 | 2002-01-09 | Honda Motor Co Ltd | 内燃機関の動弁装置 |
DE10054623A1 (de) | 2000-11-03 | 2002-05-08 | Audi Ag | Vorrichtung zum Umschalten zumindest eines Nockenpaketes |
US7104229B2 (en) * | 2001-04-05 | 2006-09-12 | Stephen William Mitchell | Variable valve timing system |
JP4100054B2 (ja) * | 2002-06-20 | 2008-06-11 | トヨタ自動車株式会社 | 内燃機関の可変動弁装置 |
DE102004011586A1 (de) * | 2003-03-21 | 2004-10-07 | Audi Ag | Ventiltrieb einer einen Zylinderkopf aufweisenden Brennkraftmaschine |
DE502004008185D1 (de) * | 2003-07-19 | 2008-11-20 | Porsche Ag | Ventiltrieb für eine Brennkraftmaschine |
US7198015B2 (en) * | 2005-05-24 | 2007-04-03 | George Wayne Mobley | Variable valve timing system |
DE102007016977A1 (de) * | 2007-04-10 | 2008-10-16 | Bayerische Motoren Werke Aktiengesellschaft | Vorrichtung zum Verstellen der Hubfunktion eines nockenbetätigten Ventils |
DE102007027979B4 (de) * | 2007-06-19 | 2015-07-23 | Audi Ag | Ventiltrieb für Gaswechselventile einer Brennkraftmaschine mit Nockenwellen-Tunnellager |
DE102007037747B4 (de) * | 2007-08-10 | 2022-06-15 | Mercedes-Benz Group AG | Brennkraftmaschinenventiltriebumschaltvorrichtung |
DE102007054978B4 (de) | 2007-11-17 | 2023-12-14 | Mercedes-Benz Group AG | Ventiltriebvorrichtung |
DE102009017242B4 (de) | 2009-04-09 | 2011-09-22 | Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr | Ventiltrieb für Brennkraftmaschinen zur Betätigung von Gaswechselventilen |
DE102009034990A1 (de) | 2009-07-28 | 2011-02-03 | Daimler Ag | Ventiltriebvorrichtung |
DE102009037268B3 (de) | 2009-08-10 | 2011-04-07 | Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr | Variabler Ventiltrieb für Brennkraftmaschinen zur Betätigung von Gaswechselventilen |
DE102009037269B4 (de) | 2009-08-10 | 2011-06-01 | Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr | Ventiltrieb für Verbrennungskraftmaschinen zur Betätigung von Gaswechselventilen |
DE102009055868A1 (de) | 2009-11-26 | 2011-06-01 | Neumayer Tekfor Holding Gmbh | Nockenwelle |
DE102010011897B4 (de) * | 2010-03-18 | 2016-08-25 | Thyssenkrupp Presta Teccenter Ag | Ventiltrieb mit Nockenwelle mit axial verschiebbarer Nockeneinheit |
DE102011108728B4 (de) * | 2011-07-27 | 2013-02-07 | Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr | Ventiltrieb für Brennkraftmaschinen zur Betätigung von Gaswechselventilen |
-
2009
- 2009-08-10 DE DE102009037270A patent/DE102009037270B4/de not_active Expired - Fee Related
-
2010
- 2010-08-03 WO PCT/DE2010/000931 patent/WO2011018074A2/de active Application Filing
- 2010-08-03 US US13/388,062 patent/US8746194B2/en not_active Expired - Fee Related
- 2010-08-03 EP EP10760230.2A patent/EP2464834B1/de not_active Not-in-force
- 2010-08-03 JP JP2012524111A patent/JP5649238B2/ja not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO2011018074A2 * |
Also Published As
Publication number | Publication date |
---|---|
DE102009037270A1 (de) | 2011-03-03 |
US8746194B2 (en) | 2014-06-10 |
JP2013501873A (ja) | 2013-01-17 |
US20120125274A1 (en) | 2012-05-24 |
WO2011018074A3 (de) | 2011-04-28 |
EP2464834B1 (de) | 2013-07-24 |
JP5649238B2 (ja) | 2015-01-07 |
WO2011018074A2 (de) | 2011-02-17 |
DE102009037270B4 (de) | 2011-04-07 |
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