EP 1537300 A1 20050608 - HYDRAULIC VALVE ACTUATOR FOR ACTUATING A GAS EXCHANGE VALVE
Title (en)
HYDRAULIC VALVE ACTUATOR FOR ACTUATING A GAS EXCHANGE VALVE
Title (de)
HYDRAULISCHER VENTILSTELLER ZUM BETÄTIGEN EINES GASWECHSELVENTILS
Title (fr)
ACTIONNEUR HYDRAULIQUE DE SOUPAPE SERVANT A ACTIONNER UNE SOUPAPE D'ECHANGE DE GAZ
Publication
Application
Priority
- DE 0300699 W 20030305
- DE 10239747 A 20020829
Abstract (en)
[origin: WO2004022929A1] The invention relates to a hydraulic valve actuator for actuating a gas exchange valve (10) in a combustion cylinder of an internal combustion engine. Said valve actuator comprises an actuating piston (16) defining two pressure chambers (17, 18). The lower pressure chamber (18) acting in the valve closing direction is permanently subjected to a liquid pressure, and the upper pressure chamber (17) can be selectively subjected to a liquid pressure or relieved thereof by means of an admission and a reflux (22, 23). In order to moderate the gas exchange valve (10) in the end phase of the closing process, and thus to reduce the impact speed, the reflux (23) of the upper pressure chamber (17) is split into two interspaced, interconnected outflow openings (231, 232) arranged in the housing (15). A throttle region (29) is associated with the upper outflow opening (231), and the lower outflow opening (232) can be displaced in relation to the actuating piston (16) and is arranged in the displacement path of the piston in such a way that it can be closed by the same at a defined distance from its upper end position.
IPC 1-7
IPC 8 full level
F01L 9/10 (2021.01)
CPC (source: EP US)
F01L 9/10 (2021.01 - EP US)
Citation (search report)
See references of WO 2004022929A1
Designated contracting state (EPC)
DE FR IT
DOCDB simple family (publication)
DE 10239747 A1 20040311; DE 50303725 D1 20060720; EP 1537300 A1 20050608; EP 1537300 B1 20060607; JP 2005537428 A 20051208; JP 4443410 B2 20100331; US 2005028763 A1 20050210; US 7007642 B2 20060307; WO 2004022929 A1 20040318
DOCDB simple family (application)
DE 10239747 A 20020829; DE 0300699 W 20030305; DE 50303725 T 20030305; EP 03714677 A 20030305; JP 2004533189 A 20030305; US 49385804 A 20040929