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1. WO2020108933 - VARIABLE-LIFT VALVE TRAIN HAVING AT LEAST TWO WORKING POSITIONS

Publication Number WO/2020/108933
Publication Date 04.06.2020
International Application No. PCT/EP2019/080347
International Filing Date 06.11.2019
IPC
F01L 13/00 2006.01
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
LCYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
13Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
CPC
F01L 1/053
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
LCYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
1Valve-gear or valve arrangements, e.g. lift-valve gear
02Valve drive
04by means of cams, camshafts, cam discs, eccentrics or the like
047Camshafts
053overhead type
F01L 1/185
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
LCYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
1Valve-gear or valve arrangements, e.g. lift-valve gear
12Transmitting gear between valve drive and valve
18Rocking arms or levers
185Overhead end-pivot rocking arms
F01L 13/0005
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
LCYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
13Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
0005Deactivating valves
F01L 13/0063
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
LCYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
13Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
0015for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
0063by modification of cam contact point by displacing an intermediate lever or wedge-shaped intermediate element, e.g. Tourtelot
F01L 2013/0068
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
LCYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
13Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
0015for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
0063by modification of cam contact point by displacing an intermediate lever or wedge-shaped intermediate element, e.g. Tourtelot
0068with an oscillating cam acting on the valve of the "BMW-Valvetronic" type
F01L 2305/00
Applicants
  • BAYERISCHE MOTOREN WERKE AKTIENGESELLSCHAFT [DE]/[DE]
Inventors
  • MINCIONE, Giovanni
  • LOHDE, Steffen
  • WABBALS, Din
  • SPERRHACKE, Sebastian
  • CLAUBERG, Jan
Priority Data
10 2018 130 428.530.11.2018DE
Publication Language German (DE)
Filing Language German (DE)
Designated States
Title
(DE) HUBVARIABLER VENTILTRIEB MIT WENIGSTENS ZWEI ARBEITSLAGEN
(EN) VARIABLE-LIFT VALVE TRAIN HAVING AT LEAST TWO WORKING POSITIONS
(FR) MÉCANISME DE DISTRIBUTION À COURSE VARIABLE PRÉSENTANT AU MOINS DEUX POSITIONS DE TRAVAIL
Abstract
(DE)
Die Erfindung betrifft einen hubvariablen Ventiltrieb (1) für ein Gaswechselventil (2) einer Brennkraft-maschine, aufweisend eine Hubanpassung (4), insbesondere einen Zwischenhebel, mit einer Arbeitskurve (2), die zumindest in einer ersten Arbeitslage (A1) zur Stellung eines Teilhubs (hmill) und in einer zweiten Arbeitslage (A2) zur Stellung eines Maximalhubs (hmax) angeordnet werden kann, wobei die Arbeitskurve in einem Bereich (BKmax) eine maximale Kurvenkrümmung (Kmax) aufweist, einen Hubsteller (10), insbesondere einen Nocken einer Nockenwelle, der eine Stellkontur (NK) zum Auslenken der Hubanpassung aufweist, einen Hubhebel (9), insbesondere einen Rollenschlepphebel, der mittels der Arbeitskurve ausgelenkt werden und dadurch einen Hub (h) des Gaswechselventils stellen kann, wobei die Arbeitskurve der ausgelenkten Hubanpassung beim Verfahren über eine Kontaktfläche des Hubhebels das Gaswechselventil stellen kann, sowie ein Verfahren zum Betrieb eines hubvariablen Ventiltriebs (1).
(EN)
The invention relates to a variable-lift valve train (1) for a gas exchange valve (2) of an internal combustion engine, having: a lift adjuster (4), in particular an intermediate lever, with a working curve (2) which can be arranged at least in a first working position (A1) for setting a partial lift (hmill) and in a second working position (A2) for setting a maximum lift (hmax), the working curve having a maximum curvature (Kmax) in one region (BKmax); a lift actuator (10), in particular a cam of a camshaft, which has an actuating contour (NK) for deflecting the lift adjuster; a lift lever (9), in particular a roller finger follower, which can be deflected by means of the working curve and thereby set a lift (h) of the gas exchange valve, wherein the working curve of the deflected lift adjuster can actuate the gas exchange valve when moved over a contact face of the lift lever. The invention also relates to a method for operating a variable-lift valve train (1).
(FR)
L'invention concerne un mécanisme de distribution à course variable (1) pour une soupape d'échange des gaz (2) d'un moteur à combustion interne. Le mécanisme présente une adaptation de course (4), en particulier un levier intermédiaire, pourvue d'une courbe de travail (2), qui peut être disposée au moins dans une première position de travail (A1) pour le réglage d'une course partielle (hmill) et dans une deuxième position de travail (A2) pour le réglage d'une course maximale (hmax), la courbe de travail présentant dans une deuxième zone (BKmax) une courbure maximale (Kmax), un actionneur (10) de course, en particulier une came d'un arbre à cames, qui présente un contour de réglage (NK) pour la déviation de l'adaptation de course, un levier de course (9), en particulier un levier de contact à galet, qui peut être dévié au moyen de la courbe de travail et peut ainsi régler une course (h) de la soupape d'échange des gaz, la courbe de travail du dispositif d'adaptation de course dévié, lors d'un déplacement au-dessus d'une surface de contact du levier de course, pouvant régler la soupape d'échange des gaz. L'invention concerne également un procédé pour le fonctionnement d'un mécanisme de distribution à course variable (1).
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