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WO2009003840A2 - Culbuteur pour une commande de soupape d'un moteur à combustion interne - Google Patents

Culbuteur pour une commande de soupape d'un moteur à combustion interne Download PDF

Info

Publication number
WO2009003840A2
WO2009003840A2 PCT/EP2008/057672 EP2008057672W WO2009003840A2 WO 2009003840 A2 WO2009003840 A2 WO 2009003840A2 EP 2008057672 W EP2008057672 W EP 2008057672W WO 2009003840 A2 WO2009003840 A2 WO 2009003840A2
Authority
WO
WIPO (PCT)
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.)
Ceased
Application number
PCT/EP2008/057672
Other languages
German (de)
English (en)
Other versions
WO2009003840A3 (fr
Inventor
Oliver Schnell
Helmut Engelhardt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
IHO Holding GmbH and Co KG
Original Assignee
Schaeffler KG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Schaeffler KG filed Critical Schaeffler KG
Priority to EP08774123A priority Critical patent/EP2171221B1/fr
Priority to AT08774123T priority patent/ATE524639T1/de
Publication of WO2009003840A2 publication Critical patent/WO2009003840A2/fr
Anticipated expiration legal-status Critical
Publication of WO2009003840A3 publication Critical patent/WO2009003840A3/fr
Ceased legal-status Critical Current

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
    • 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

  • the invention relates to a drag lever for a valve train of an internal combustion engine with a Tellerhubventil whose shaft end surface is acted upon by a contact surface of the rocker arm with at least two different valve strokes.
  • the contact surface has a convexly curved in the longitudinal direction of the drag lever profile with at least one profile point, emanating from the two contact areas with mutually different and each adapted to one of the valve lifts profile curves.
  • Such a finger follower is known from DE 10 2004 049 836 A1, which is regarded as generic.
  • the rocker arm proposed there has a contact surface for actuating the disk lifting valve whose profile is composed of two circular-arc-shaped contact areas with radii of different sizes.
  • the first large radius contact area is adapted to a conventional valve lift transmitted from the cam of a camshaft to the Tellerhubventil, while the second small radius contact area is adapted to a deactivated valve lift.
  • This deactivated valve lift or valve zero stroke is produced by the fact that the stroke predetermined by the cam is not transmitted to the plate-lift valve, but is absorbed by a switchable support element which supports the cam follower.
  • 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 advantageous effects of the invention are particularly noticeable with increasing component tolerances of the valve gear according to a relatively large deviation of the profile point from the actual contact point noticeable, since on the one hand the gentle profile change leads to no inadmissibly high vibration excitation in the valve train and on the other in the vicinity of the profile point a small curvature both contact areas in favor of low contact pressures can be provided.
  • Ci and C 2 are constants
  • x coordinates the profile originating from the profile point in the longitudinal direction of the finger lever
  • the exponent a is a real number.
  • the expert in the field of valve actuators is an useful tool in useful technical and mathematical optimization tool for Profilge- the contact surface of the finger lever is given to hand.
  • At least one of the contact areas has a circular arc-shaped profile profile with a constant curvature.
  • the contact area with constant curvature is adapted to an activated valve lift and the contact area with continuously variable curvature to a deactivated valve lift.
  • the contact region with variable curvature has an overall steeper profile than the contact region with constant curvature.
  • 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. 1 shows a valve train of an internal combustion engine with a drag lever according to the invention in longitudinal section
  • Figure 2 is a provided for the valve gear according to Figure 1 switchable
  • FIG. 3 shows a profile view of the contact surface of the finger lever according to FIG. 1 .
  • FIG. 1 shows a valve drive 1 of an internal combustion engine with a drag lever 2, which is mounted in a manner known per se at one end on a support element 3 stationarily arranged in the internal combustion engine and has a rotatable roller 4 for tapping a cam 5 of a camshaft.
  • the non-cutting formed here of sheet metal drag lever 2 has at the other end a transverse web 6 with a contact surface 7 for the shaft end surface 8 of a spring-loaded in the closing direction Tellerhubventils 9.
  • the contact surface 7 has a convexly curved profile in the longitudinal direction of the drag lever 2, which comprises two contact regions with mutually different profile progressions.
  • the design of the contact surface 7 makes it possible for the drag lever 2 according to the common-part principle not only in conjunction with the conventional, non-switchable support element 3, but also in conjunction with a switchable support element 10, as in the prior art in various embodiments known and is shown as an example in Figure 2, to use.
  • it may be provided to equip the valve drive 1 of the internal combustion engine with identical drag levers 2, which are partly supported on non-shiftable support elements 3 and partially on switchable support elements 10, so that only a portion of the plate lift valves 9 is subjected to a variable valve lift is.
  • variable valve lift is a valve lift or valve zero stroke that is completely deactivated as a function of the operating point by interrupting the transmission of the cam lift to the plate lift valve 9.
  • the cam lift is actuated by the switchable support element 10 with the rocker arm 2 then pivoting in the opposite direction added.
  • the function and structure of the known switchable support element 10 can be summarized at this point to the effect that the switchable support element 10 in a housing 11th against the force of a lost-motion spring 12 longitudinally movably mounted pivot bearing 13 for the finger lever 2 and a hydraulically actuated locking mechanism 14 here by which a formschlüssü sig acting support of the pivot bearing 13 in the outer housing 11 can be produced or solvable bar.
  • the profile of the contact surface 7 is shown greatly enlarged in Figure 3 in diagram form.
  • the orientation of the contact surface 7 shown in Figure 1 was maintained, ie the right side of the ordinate y and designated K x designated contact area facing the roller 4 and the left side of the ordinate y shown and a circular arc profile profile with radius Ri having contact area K 1 the role 4 turned away.
  • the zero point of the abscissa x corresponds to a profile point P 0 , from which the two contact areas K x and K 1 emanate, where x indicates the distance coordinate of the profile point P 0 in mm.
  • the contact area K x has a natural logarithmic profile course K (x).
  • this profile curve K (x) corresponds to the design formula given at the top left of the diagram with the parameters C 1 , C 2 and a specified below.
  • 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.
  • the contact region K 1 with radius R 1 extending on the left side of the ordinate and the contact region K x with logarithmic profile profile K (x) have the substantially identical curvature 1 / R 1 at the profile point P 0 , while the curvature 1 / R 2 of the reference region K 2 is significantly greater and at the profile point P 0 to a jerk due to the Krüm- would lead.
  • a further advantage of the contact surface 7 profiled in this way relates to the surface pressures in contact when the valve lift is activated, since the contact region K x of variable curvature at the profile point P 0 and in its vicinity has a significantly smaller curvature than the reference region K 2 . Consequently, in the case in which the profile point P 0 only comes into effective engagement with the shaft end surface 8 during the activated valve stroke, the contact region K x would also be exposed to the then high contact forces due to valve acceleration and valve spring force.
  • the corresponding contact pressures can be kept at the same low level which sets in the contact region K 1 with a circular arc profile profile and comparatively low curvature 1 / R 1 .
  • the contact region K x with a variable curvature has an overall steeper profile than the circular-arc-shaped contact region K 1 .
  • the correspondingly small and initially in the direction of the roller 4 running emigration of the contact surface 7 on the shaft end face 8 is thereby kept very small when the valve is deactivated.
  • the profile point P 0 can also exaggerate the end surface 8 of the shaft. and offset here to the roller 4 during the base circle phase of the cam contact 5, so that the proven kinematic and tribological contact relationships between the contact surface 7 and the shaft end surface 8 are maintained when the valve is activated.

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

L'invention concerne un culbuteur (2) pour une commande de soupape (1) d'un moteur à combustion interne avec une soupape à champignon (9) dont la surface d'extrémité de tige (8) peut être sollicitée par le biais d'une surface de contact (7) du culbuteur (2) avec au moins deux courses de soupape différentes. La surface de contact (7) présente un profil de courbure convexe dans la direction longitudinale du culbuteur (2), avec au moins un point du profil (P0) duquel partent deux zones de contact (K1, Kx) avec des courbes de profil différentes et à chaque fois adaptées à l'une des courses de soupape. En l'occurrence, au moins l'une des zones de contact (K1, Kx) présente une courbe de profil avec une courbure variable en continu, les courbures des zones de contact (K1, Kx) au niveau du point du profil (P0) étant sensiblement identiques.
PCT/EP2008/057672 2007-07-05 2008-06-18 Culbuteur pour une commande de soupape d'un moteur à combustion interne Ceased WO2009003840A2 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP08774123A EP2171221B1 (fr) 2007-07-05 2008-06-18 Culbuteur pour une commande de soupape d'un moteur à combustion interne
AT08774123T ATE524639T1 (de) 2007-07-05 2008-06-18 Schlepphebel für einen ventiltrieb einer brennkraftmaschine

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US94804107P 2007-07-05 2007-07-05
US60/948,041 2007-07-05

Publications (2)

Publication Number Publication Date
WO2009003840A2 true WO2009003840A2 (fr) 2009-01-08
WO2009003840A3 WO2009003840A3 (fr) 2010-02-25

Family

ID=40226569

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2008/057672 Ceased WO2009003840A2 (fr) 2007-07-05 2008-06-18 Culbuteur pour une commande de soupape d'un moteur à combustion interne

Country Status (3)

Country Link
EP (1) EP2171221B1 (fr)
AT (1) ATE524639T1 (fr)
WO (1) WO2009003840A2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020111775A1 (de) 2020-04-30 2021-11-04 Schaeffler Technologies AG & Co. KG Hebel für einen Ventiltrieb einer Brennkraftmaschine
DE102020111773A1 (de) 2020-04-30 2021-11-04 Schaeffler Technologies AG & Co. KG Hebel für einen Ventiltrieb einer Brennkraftmaschine

Families Citing this family (1)

* Cited by examiner, † Cited by third party
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

Family Cites Families (8)

* Cited by examiner, † Cited by third party
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

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020111775A1 (de) 2020-04-30 2021-11-04 Schaeffler Technologies AG & Co. KG Hebel für einen Ventiltrieb einer Brennkraftmaschine
DE102020111773A1 (de) 2020-04-30 2021-11-04 Schaeffler Technologies AG & Co. KG Hebel für einen Ventiltrieb einer Brennkraftmaschine

Also Published As

Publication number Publication date
WO2009003840A3 (fr) 2010-02-25
EP2171221A2 (fr) 2010-04-07
EP2171221B1 (fr) 2011-09-14
ATE524639T1 (de) 2011-09-15

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