EP2171221A2 - Schlepphebel für einen ventiltrieb einer brennkraftmaschine - Google Patents
Schlepphebel für einen ventiltrieb einer brennkraftmaschineInfo
- Publication number
- EP2171221A2 EP2171221A2 EP08774123A EP08774123A EP2171221A2 EP 2171221 A2 EP2171221 A2 EP 2171221A2 EP 08774123 A EP08774123 A EP 08774123A EP 08774123 A EP08774123 A EP 08774123A EP 2171221 A2 EP2171221 A2 EP 2171221A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- profile
- contact
- valve
- curvature
- contact areas
- 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 abstract description 9
- 239000002585 base Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000036461 convulsion Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 230000033001 locomotion Effects 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000012458 free base Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 230000007704 transition Effects 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
- 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
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/14—Tappets; Push rods
- F01L1/16—Silencing impact; Reducing wear
-
- 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
-
- 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
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/0005—Deactivating valves
-
- 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
- F01L2001/187—Clips, e.g. for retaining rocker arm on pivot
-
- 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
-
- 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
- F01L2820/00—Details on specific features characterising valve gear arrangements
- F01L2820/02—Formulas
Definitions
- contact surface with two different radii ranges has the favorable property that the kinematic and hydrodynamic contact relationships between the contact surface of the finger lever and the shaft end surface of the Tellerhubventils largely independent of additional factors resulting from the changed Ventiltriebskinematik with deactivated valve lift, optimally can be adjusted.
- These influencing variables are, in particular, the contact between the contact surface of the drag lever and the shaft end surface of the disk stroke valve which migrates in the longitudinal direction of the drag lever or, in short, the so-called emigration.
- the known contact surface with two different but constant radii over the respective contact area and correspondingly constant curvatures can be disadvantageous in that the profile point does not start with the actual radii / curvature Contact point on the contact surface during the stroke-free base circle phase of the cam coincides. Starting from the base circle phase, the profile change between the contact regions as a result of a bending jump would then lead to abruptly changing contact conditions between the drag lever and the Tellerhubventil in the course of the lifting phase of the cam.
- the aforementioned deviation of the profile point from the actual contact point can also be accompanied by undesired contact pressures. This is the case, for example, when at the beginning and at the end of a large valve lift the contact area with a small radius and a correspondingly large curvature is in engagement with the shaft end surface of the plate-lifting valve.
- the present invention is therefore the object of a drag lever of the type mentioned in such a way that the disadvantages mentioned are eliminated with simple means and in terms of manufacturing costs of the rocker arm substantially cost neutral.
- At least one of the contact regions has a profile profile with a continuously variable curvature, wherein the curvatures of the contact regions at the profile point are substantially the same size.
- a profiled contact surface can in the profile point as a starting point to the contact areas a kinematic jerk-free, i. significantly smoother profile change can be achieved than is possible in the case of the known contact surface with different, but partially constant radii / curvatures.
- the so-called jerk in the profile point which is unavoidable in a curvature jump due to the coincidence of different radii, can be effectively eliminated.
- the contact surface can then contact the shaft end face also eccentric during the base circle phase of the cam -ideally at Profiltician- so that the proven kinematic and tribological contact conditions are maintained with activated valve lift, while at deactivated valve lift which then opposite running emigration of the contact surface on the shaft end surface can be kept very small.
- Another possibility consists in a reversed assignment of the contact areas to the different valve lifts. Accordingly, it can also be provided to adapt the contact region with continuously variable curvature to the activated valve lift and the contact region with constant curvature at a comparatively small radius to the deactivated valve lift.
- FIG. 3 shows a profile view of the contact surface of the finger lever according to FIG. 1 .
- the contact region K x Compared to the reference region K 2 , whose curvature is by definition 1 / R 2 , the contact region K x according to the invention has a significantly smaller curvature in the vicinity of the profile point P 0 , which at the profile point P 0 with the curvature 1 / R 1 of the contact region K 1 is essentially identical. This fact is clarified in the additional detailed diagram placed on the ordinate, which highlights the profile profiles of the contact areas K 1 , K x and K 2 at profile point P 0 according to detail Z.
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 |
---|---|---|---|
US94804107P | 2007-07-05 | 2007-07-05 | |
PCT/EP2008/057672 WO2009003840A2 (de) | 2007-07-05 | 2008-06-18 | Schlepphebel für einen ventiltrieb einer brennkraftmaschine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2171221A2 true EP2171221A2 (de) | 2010-04-07 |
EP2171221B1 EP2171221B1 (de) | 2011-09-14 |
Family
ID=40226569
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08774123A Active EP2171221B1 (de) | 2007-07-05 | 2008-06-18 | Schlepphebel für einen ventiltrieb einer brennkraftmaschine |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2171221B1 (de) |
AT (1) | ATE524639T1 (de) |
WO (1) | WO2009003840A2 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102014116791A1 (de) | 2014-11-17 | 2016-05-19 | Volkswagen Ag | Nockenfolger und eine mit einem solchen Nockenfolger ausgestattete Brennkraftmaschine |
DE102020111773A1 (de) | 2020-04-30 | 2021-11-04 | Schaeffler Technologies AG & Co. KG | Hebel für einen Ventiltrieb einer Brennkraftmaschine |
DE102020111775A1 (de) | 2020-04-30 | 2021-11-04 | Schaeffler Technologies AG & Co. KG | Hebel für einen Ventiltrieb einer Brennkraftmaschine |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4502426A (en) * | 1982-05-17 | 1985-03-05 | Skelley James H | Variable valve lift and timing mechanism |
JPS6116202A (ja) * | 1984-07-03 | 1986-01-24 | Honda Motor Co Ltd | 内燃機関のバルブロツカ−ア−ム装置 |
FR2643676B1 (fr) * | 1989-02-28 | 1991-06-07 | Peugeot | Culbuteur pour l'actionnement d'une soupape a tige d'un moteur a combustion interne |
DE4244326A1 (de) * | 1992-12-28 | 1994-06-30 | Kloeckner Humboldt Deutz Ag | Kipphebel zur Betätigung eines Ventils eines Verbrennungsmotors |
DE19838926A1 (de) * | 1998-08-27 | 2000-03-02 | Schaeffler Waelzlager Ohg | Schaltbarer Ventiltrieb einer Brennkraftmaschine |
DE10164493B4 (de) * | 2001-12-29 | 2010-04-08 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Vorrichtung zur variablen Betätigung der Ladungswechselventile in Hubkolbenmotoren |
DE102004005594A1 (de) * | 2004-02-04 | 2005-08-25 | Fev Motorentechnik Gmbh | Schlepphebel zur Hubumschaltung |
DE102004049836A1 (de) * | 2004-10-13 | 2006-05-04 | Daimlerchrysler Ag | Brennkraftmaschine |
-
2008
- 2008-06-18 EP EP08774123A patent/EP2171221B1/de active Active
- 2008-06-18 AT AT08774123T patent/ATE524639T1/de active
- 2008-06-18 WO PCT/EP2008/057672 patent/WO2009003840A2/de active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2009003840A2 * |
Also Published As
Publication number | Publication date |
---|---|
WO2009003840A2 (de) | 2009-01-08 |
WO2009003840A3 (de) | 2010-02-25 |
ATE524639T1 (de) | 2011-09-15 |
EP2171221B1 (de) | 2011-09-14 |
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