EP2291578A1 - Valve train for gas exchange valves of an internal combustion engine having double-supported cam carriers - Google Patents
Valve train for gas exchange valves of an internal combustion engine having double-supported cam carriersInfo
- Publication number
- EP2291578A1 EP2291578A1 EP09765507A EP09765507A EP2291578A1 EP 2291578 A1 EP2291578 A1 EP 2291578A1 EP 09765507 A EP09765507 A EP 09765507A EP 09765507 A EP09765507 A EP 09765507A EP 2291578 A1 EP2291578 A1 EP 2291578A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cam
- cam carrier
- camshaft
- valve drive
- base 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.)
- 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
- 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
- F01L1/053—Camshafts overhead type
-
- 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
- the invention relates to a valve drive for gas exchange valves of an internal combustion engine according to the preamble of claims 1 and 12.
- 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.
- valve train of the type mentioned is already known in which a plurality of cam carrier rotatably and axially displaceably guided on a basic camshaft provided with an external toothing.
- two axially spaced cam profile groups are provided on the associated cam carrier, each of which has two different cam profiles.
- the known valve drive has locking devices.
- each include a pressure element in the form of a detent ball, which is inserted into a radial blind hole of the base camshaft and is pressed by the force of a helical compression spring in the bore radially outwardly against an opposite oblique edge of a detent groove or detent groove.
- the detent balls act on the associated cam carrier with a radial and an axial force component, of which the latter serves to press the cam carrier against serving as a stop face of a bearing block and thus fix it in a defined axial position.
- the locking devices are each arranged radially inwardly of a cam profile group in the vicinity of one of the two front ends of each cam carrier.
- this has a slight misalignment of the cam carrier result.
- This results in each valve actuation to an audible audible noise, when the opposite, not pressed against the base camshaft Stimende the cam carrier strikes its internal teeth due to a system change in the vicinity of the maximum valve lift against the outer teeth of the basic camshaft.
- Another cause for the formation of noise in the valve train is that to facilitate the production of the basic camshaft all serving to accommodate the helical compression springs and the locking balls blind holes are aligned parallel to each other and open on the same side of the base camshaft. Due to the different opening times of the gas exchange valves of adjacent cylinders and the angular offset of the lift curves of the cams on adjacent cam carriers required thereby, this results in the radial forces exerted by the locking balls or the pressure elements on the cam carriers having a different angular orientation with respect to the lift curves of the cam carriers which may also be the cause of noise.
- the parallel alignment of all bores moreover has the disadvantage that the reaction forces exerted by the helical compression springs on the basic camshaft all have the same direction, whereby the base camshaft is supported on one side by the cam carriers and bent in this direction.
- the invention has the object to counteract a noise in the valve train.
- an additional pressure element is provided at an axial distance from the pressure element, which is also pressed against an opposite inner peripheral portion of the cam carrier to thereby leading to the noise hitting a non-supported part of the cam carrier during emergence of a Cam on the cooperating with the cam roller cam followers of the associated gas exchange valve to avoid.
- the two pressure elements of each cam carrier are pressed against the respectively opposite inner peripheral portion of the cam carrier with almost identical pressure forces, which is most easily achieved by using the same or similar springs.
- the two pressure elements of each cam carrier are preferably pressed with the same orientation against the respective opposite inner peripheral portion of the cam carrier.
- the orientation of the recesses in the base camshaft serving to receive the pressing elements with respect to the cams of the cam carriers pushed onto the basic camshaft is preferably chosen such that recesses open on the side of the basic camshaft corresponding to the cam tips, i. the crests of the lifting curves of the cam, is approximately opposite, so that the cam carrier are pressed on the side of the cam tips and the lift curves of the cam against the base camshaft.
- the alignment of the recesses is advantageously chosen so that the longitudinal axes of the recesses formed appropriately as holes between the angular distance run from each other arranged cam tips.
- the two pressure elements are each in the vicinity of the opposite ends of the cam carrier, i. on opposite sides of an axial center of the cam carrier, wherein they are expediently arranged on both sides of a provided with an external toothing portion of the basic camshaft.
- the pressing element of the locking device is advantageously offset by a detent recess, while the further pressure element is opposed by a cylindrical peripheral surface of the cam carrier adjoining the internal toothing.
- a second alternative of the invention and preferred embodiment of the first alternative of the invention provides that the pressure elements of different cam carriers are offset or rotated in the circumferential direction of the base camshaft so that all pressure elements have the same orientation with respect to the lift curves of the cams. This ensures, on the one hand, that the direction of the force attack on all cams or cam carriers is the same, which counteracts a noise.
- the mutual angular offset of the pressure elements of adjacent cam carriers is preferably 3607n or 2 x 3607n.
- FIG. 1 shows a partially sectioned side view of a portion of a base camshaft and a cam carrier displaceable on the base camshaft of a valve drive according to the invention for gas exchange valves of an internal combustion engine;
- Fig. 2 a side view of the entire basic camshaft without cam carrier, i. before mounting on the basic camshaft;
- 3a to 3d cross-sectional views of the basic camshaft along the lines a-a, b-b, c-c and d-d of Fig. 2 after mounting the cam carrier on the base camshaft and the interaction thereof with roller cam followers of gas exchange valves of four cylinders arranged in series with the same valve.
- valve drive 1 In the case of the valve drive 1 only partially illustrated in the drawing for pairs of intake valves 2 of four cylinders of a straight-line engine, the stroke and the opening times of the two intake valves 2 of each cylinder can be adjusted.
- valve drive 1 comprises a rotatably mounted basic camshaft 3 and four cam carriers 4, mounted rotatably and axially displaceably on the base camshaft 3, one of which is shown enlarged in longitudinal section in FIG. 1 and two actuators 5 for displacing each cam carrier 4 between two defined axial displacement positions.
- the cam carrier 4 have at their outer periphery in each case two axially spaced cam pairs 6, each of which consists of two cams 7, 8. As best shown in FIGS. 1 and 3, each of the pair of cams 6 cooperates with a roller 9 of a pivotally mounted roller cam 10 of the associated inlet valve 2.
- the rollers 9 as required with one of the two cams 7, 8 of a pair of cams. 6 be brought into abutting contact, so that they move over a stroke contour 11 of the cam 7, 8 during each revolution of the base camshaft 3 once, the roller rocker arm 10 is pivoted by opening the valve 2.
- one of the two actuators 5 is actuated in each case in order to extend a driver pin 12 of the actuator 5 during one revolution of the cam carrier 4 and thereby engage in an opposite helical groove 13 on the adjacent end of the cam carrier 4.
- the displacement of the cam carrier 4 always takes place when base circle sections 14 of the cams 7, 8 of both pairs of cams 6 rest against the rollers 9 of the cam followers 10.
- each cam carrier 4 In order to guide the tubular cam carrier 4 in a rotationally fixed and axially displaceable manner on the base camshaft 3, the latter is provided within each cam carrier 4 at its outer circumference in sections with an external toothing 15 which meshes with a complementary internal toothing 16 on the inner circumference of the associated cam carrier 4. As best shown in Fig. 2, portions 17 are provided with a cylindrical peripheral surface between adjacent, provided with an external toothing portions, over which the external teeth 15 protrudes.
- Each cam carrier 4 has between the two pairs of cams 5, 6 a cylindrical portion 18 which is mounted in a fixedly mounted in the cylinder head housing slide bearing 19, as best shown in Fig. 1.
- the sliding bearing 19 has two opposite end faces 20, 21, which serve in each of the two displacement positions as a stop for an opposite end face 22, 23 of the cam 18 adjacent to the portion 18 of each cam pair 6, to a defined axial position of the cam carrier 4 to adjust.
- a locking device 24 is provided at a front end of each cam carrier 4.
- the locking device comprises a radial blind hole 25 in the base camshaft 3, in which a locking ball 26 is guided radially movable.
- a helical compression spring 27 is used, which presses the locking ball 26 radially outwardly against an inclined groove flank 28 in one of two recessed in an inner circumferential portion of the cam carrier 4 recessed grooves 29 and thereby the cam carrier 4 against one of the stop surfaces 20, 21 expresses as described in detail in the aforementioned DE 10 2004 011 586 A1 of the Applicant.
- a blind hole 30 parallel to the blind bore 25 is arranged on the opposite end face of the cam carrier 4, in which also a radially movable ball 31 radially outwardly by the force of a helical compression spring 32 is pressed against an opposite inner peripheral portion of the cam carrier 4.
- the inner peripheral portion of the cam carrier has a cylindrical surface 33, in which no latching grooves 29 are recessed.
- each cam carrier 4 open on the same side of the base camshaft 3, while the two helical compression springs 28, 32 have the same dimensions, so that of them on the balls 26, 31 applied forces have the same direction and almost the same amount.
- the pairs of blind bores 25, 30 for the four cam carriers 4 mounted on the base camshaft 3 are aligned such that they each have an angle corresponding to the firing order, in the exemplary embodiment shown in the drawing 90.degree 180 °, with the blind bores 25, 30 for the or the adjacent cam carrier 4, this angle also corresponds to the angular offset with which the adjacent cam carrier 4 are pushed onto the basic camshaft 3 for driving the intake valves 2 of successive cylinders of the cylinder row. It is thus achieved that the balls 26, 31 are arranged in the same position with respect to the lifting curves 11 of the cams 7, 8 in all the cam carriers 4, as shown in FIGS.
- the drive of the basic camshaft 3 takes place via a sprocket wheel 34 (FIG. 2) of a chain drive (not shown), which is arranged in the vicinity of its one front end and connected in a rotationally fixed manner to the base camshaft 3.
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)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102008028513A DE102008028513A1 (en) | 2008-06-16 | 2008-06-16 | Valve operation for gas exchange valves of an internal combustion engine with double-supported cam carriers |
PCT/EP2009/003708 WO2009152927A1 (en) | 2008-06-16 | 2009-05-26 | Valve train for gas exchange valves of an internal combustion engine having double-supported cam carriers |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2291578A1 true EP2291578A1 (en) | 2011-03-09 |
EP2291578B1 EP2291578B1 (en) | 2015-11-25 |
Family
ID=40912148
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09765507.0A Active EP2291578B1 (en) | 2008-06-16 | 2009-05-26 | Valve train for gas exchange valves of an internal combustion engine having double-supported cam carriers |
Country Status (6)
Country | Link |
---|---|
US (1) | US9103243B2 (en) |
EP (1) | EP2291578B1 (en) |
JP (1) | JP5367073B2 (en) |
CN (1) | CN102132014B (en) |
DE (1) | DE102008028513A1 (en) |
WO (1) | WO2009152927A1 (en) |
Families Citing this family (31)
Publication number | Priority date | Publication date | Assignee | Title |
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DE102009055868A1 (en) * | 2009-11-26 | 2011-06-01 | Neumayer Tekfor Holding Gmbh | camshaft |
DE102011103544A1 (en) | 2011-06-08 | 2012-12-13 | Schaeffler Technologies AG & Co. KG | Storage of a camshaft |
DE102011104382A1 (en) | 2011-06-16 | 2012-12-20 | Daimler Ag | Internal combustion engine valve drive device for a motor vehicle |
DE102011116653B4 (en) * | 2011-10-21 | 2023-11-09 | Mercedes-Benz Group AG | Valve drive device |
JP2013185470A (en) * | 2012-03-06 | 2013-09-19 | Toyota Motor Corp | Rocker arm clip and valve train |
DE102012209310A1 (en) * | 2012-06-01 | 2013-12-05 | Schaeffler Technologies AG & Co. KG | Basic wave for a sliding cam valve drive |
DE102012209860A1 (en) | 2012-06-13 | 2013-12-19 | Schaeffler Technologies AG & Co. KG | Sliding cam valve drive, has cam piece comprising spiral groove, carrier extending along base shaft, actuator fixed to cam piece using pin retractable into spiral groove, and latching unit provided outside cam piece |
DE102012210922A1 (en) | 2012-06-27 | 2014-01-02 | Schaeffler Technologies AG & Co. KG | Component of variable shift cam valve train of internal combustion engine, has locking recesses formed in inner jacket of cam portion such that locking recesses are provided with same axial spacing as holes on ball detent mechanism |
JP6161703B2 (en) * | 2012-09-14 | 2017-07-12 | マーレ インターナショナル ゲゼルシャフト ミット ベシュレンクテル ハフツングMAHLE International GmbH | Camshaft assembly and manufacturing method thereof |
JP6003695B2 (en) * | 2013-02-06 | 2016-10-05 | マツダ株式会社 | Engine valve gear |
JP6102338B2 (en) * | 2013-02-26 | 2017-03-29 | マツダ株式会社 | Engine valve gear |
JP5947737B2 (en) | 2013-03-07 | 2016-07-06 | 日立オートモティブシステムズ株式会社 | Variable valve system, control device and variable valve device for internal combustion engine |
DE102013005803A1 (en) * | 2013-04-04 | 2014-10-09 | Daimler Ag | Valve train device for an internal combustion engine |
DE102013007741A1 (en) * | 2013-05-07 | 2014-11-13 | Thyssenkrupp Presta Teccenter Ag | camshaft |
JP6070585B2 (en) * | 2014-01-21 | 2017-02-01 | マツダ株式会社 | Engine valve gear |
JP6070586B2 (en) * | 2014-01-21 | 2017-02-01 | マツダ株式会社 | Method for assembling engine valve gear |
DE102014008898B3 (en) * | 2014-06-14 | 2015-08-13 | Audi Ag | Method for operating an internal combustion engine and corresponding internal combustion engine |
DE102014116195A1 (en) * | 2014-11-06 | 2016-05-12 | Thyssenkrupp Presta Teccenter Ag | Camshaft with at least one axially fixed sliding element |
DE102014116252A1 (en) | 2014-11-07 | 2016-05-12 | Thyssenkrupp Presta Teccenter Ag | Camshaft with an axially guided sliding element |
WO2017079383A1 (en) | 2015-11-06 | 2017-05-11 | Borgwarner Inc. | Valve operating system providing variable valve lift and/or variable valve timing |
DE102015224905A1 (en) | 2015-12-10 | 2017-06-14 | Thyssenkrupp Ag | Method for permanent attachment of cams on a carrier tube |
JP6444566B2 (en) * | 2016-04-11 | 2018-12-26 | 三菱電機株式会社 | Solenoid actuator |
DE102016222046A1 (en) * | 2016-11-10 | 2018-05-17 | Eto Magnetic Gmbh | Valve train for an internal combustion engine |
DE102016222713B4 (en) * | 2016-11-18 | 2022-02-24 | Schaeffler Technologies AG & Co. KG | Camshaft with cam piece with reduced number of teeth |
CN106593569B (en) * | 2016-12-12 | 2019-02-15 | 孙德军 | A kind of Mechanical course valve actuating gear and control method |
JP2018105175A (en) | 2016-12-26 | 2018-07-05 | トヨタ自動車株式会社 | Variable valve mechanism for engine |
DE102017219287A1 (en) | 2017-10-26 | 2019-05-02 | Volkswagen Aktiengesellschaft | Valve drive for a valve of an internal combustion engine with a locking device and a bracing device |
DE102019203432A1 (en) * | 2019-03-13 | 2020-09-17 | Mahle International Gmbh | Valve train of an internal combustion engine |
CN110043340B (en) * | 2019-05-15 | 2020-12-01 | 杰锋汽车动力系统股份有限公司 | VVL camshaft locking structure for internal combustion engine |
CN111396166A (en) * | 2020-04-16 | 2020-07-10 | 昆明云内动力股份有限公司 | Cam displacement type variable valve lift system and method |
DE102020214554A1 (en) | 2020-11-18 | 2022-05-19 | Thyssenkrupp Ag | sliding cam arrangement |
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JPH0627491B2 (en) * | 1985-12-24 | 1994-04-13 | マツダ株式会社 | Engine valve drive |
JPS6341610A (en) * | 1986-08-08 | 1988-02-22 | Mazda Motor Corp | Valve driver for engine |
KR950005088B1 (en) * | 1990-07-10 | 1995-05-18 | 미쯔비시 지도샤 고교 가부시끼가이샤 | Valve system for automobile engine |
JPH0627491A (en) * | 1992-07-13 | 1994-02-04 | Nec Corp | Production of thin-film transistor |
JPH06307216A (en) * | 1993-04-20 | 1994-11-01 | Toyota Motor Corp | High and low speed switching mechanism in valve system of internal combustion engine |
DE4419637A1 (en) | 1993-06-17 | 1994-12-22 | Volkswagen Ag | Control device for engine valves with at least one deactivatable cam on a cam shaft |
US5813377A (en) * | 1995-11-07 | 1998-09-29 | Yamaha Hatsudoki Kabushiki Kaisha | Engine valve operating system |
DE19622174A1 (en) * | 1995-12-13 | 1997-06-26 | Porsche Ag | Valve train of an internal combustion engine |
US5855190A (en) * | 1996-09-24 | 1999-01-05 | Yamaha Hatsudoki Kabushiki Kaisha | Valve-actuating variable cam for engine |
JP2000073731A (en) * | 1998-09-03 | 2000-03-07 | Toyota Motor Corp | Camshaft bearing structure of internal combustion engine |
JP4248131B2 (en) * | 2000-07-05 | 2009-04-02 | ヤマハ発動機株式会社 | Four-cycle engine valve gear |
DE10148179B4 (en) * | 2001-09-28 | 2015-09-24 | Schaeffler Technologies AG & Co. KG | Valve train with valve lift switching for the gas exchange valves of a 4-stroke internal combustion engine |
DE10148243A1 (en) | 2001-09-28 | 2003-04-10 | Ina Schaeffler Kg | Valve drive with valve lift changing for the gas shuttle valve of a four-stroke internal combustion engine comprises a toothed shaft with an external tooth arrangement |
DE102004011586A1 (en) | 2003-03-21 | 2004-10-07 | Audi Ag | Valve gear for internal combustion engine has facility whereby in first and second axial positions of cam carrier first and second stop faces fixed on cam carrier bear against respective first and second stop faces fixed on cylinder head |
DE502004008185D1 (en) * | 2003-07-19 | 2008-11-20 | Porsche Ag | Valve train for an internal combustion engine |
DE102004056290B4 (en) | 2004-11-22 | 2017-03-16 | Audi Ag | Valve gear of an internal combustion engine with at least one base camshaft |
DE102006012386B3 (en) * | 2006-03-15 | 2007-08-30 | Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr | Valve gear for internal combustion engine, has cam connected with cam shaft in torque-proof manner, and another cam supported on cam shaft, where latter cam is connectable and separable with former cam by controllable main locking piston |
DE102009059712A1 (en) * | 2009-12-18 | 2011-09-22 | Thyssenkrupp Presta Teccenter Ag | Cam unit for a built camshaft |
KR101438622B1 (en) * | 2012-12-28 | 2014-09-15 | 현대자동차 주식회사 | Variable valve lift device |
JP6102651B2 (en) * | 2013-09-18 | 2017-03-29 | マツダ株式会社 | Engine valve gear |
-
2008
- 2008-06-16 DE DE102008028513A patent/DE102008028513A1/en not_active Withdrawn
-
2009
- 2009-05-26 US US12/999,491 patent/US9103243B2/en active Active
- 2009-05-26 CN CN200980122759.4A patent/CN102132014B/en active Active
- 2009-05-26 EP EP09765507.0A patent/EP2291578B1/en active Active
- 2009-05-26 JP JP2011512855A patent/JP5367073B2/en active Active
- 2009-05-26 WO PCT/EP2009/003708 patent/WO2009152927A1/en active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2009152927A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2009152927A9 (en) | 2011-03-31 |
CN102132014B (en) | 2015-03-04 |
JP5367073B2 (en) | 2013-12-11 |
US20110180027A1 (en) | 2011-07-28 |
WO2009152927A1 (en) | 2009-12-23 |
CN102132014A (en) | 2011-07-20 |
EP2291578B1 (en) | 2015-11-25 |
US9103243B2 (en) | 2015-08-11 |
JP2011524482A (en) | 2011-09-01 |
DE102008028513A1 (en) | 2009-12-24 |
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