EP 0970300 A1 20000112 - VALVE GEAR FOR GAS EXCHANGE VALVES OF INTERNAL COMBUSTION ENGINES
Title (en)
VALVE GEAR FOR GAS EXCHANGE VALVES OF INTERNAL COMBUSTION ENGINES
Title (de)
VENTILANTRIEB FÜR GASWECHSELVENTILE VON BRENNKRAFTMASCHINEN
Title (fr)
MECANISME DE DISTRIBUTION POUR SOUPAPES DE CHANGEMENT DES GAZ DE MOTEURS A COMBUSTION INTERNE
Publication
Application
Priority
- DE 19712668 A 19970326
- EP 9801531 W 19980317
Abstract (en)
[origin: DE19712668C1] The invention relates to a valve gear for gas exchange valves of internal combustion engines, comprising a cam shaft (1). The cam (2) of this cam shaft (1) acts upon a valve shank (8) of a gas exchange valve via a bucket tappet (6) positioned in a cylinder head (5), an inside tappet (7) being supported on said bucket tappet (6) via a first pressure spring (14). The bucket tappet (6) can be coupled to the inside tappet (7) with a switchable coupling member (15). The gas exchange valve is not operated in the coupled state, provided that it is only driven via the bucket tappet (6). According to the invention, a clamping ring (15) is provided as a switchable coupling member, said clamping ring having a self-locking conical surface (17). The clamping connection can be detached with light oil pressure (P) when the gas exchange valve is closed. This results in a device for switching gas exchange valves off or over which has low frictional loss, is easy to produce, requires little construction space, and can be sealed well because of the low degree of oil pressure (P) required for operation.
IPC 1-7
IPC 8 full level
F01L 1/14 (2006.01); F01L 1/24 (2006.01); F01L 13/00 (2006.01)
CPC (source: EP US)
F01L 1/143 (2013.01 - EP US); F01L 13/0005 (2013.01 - EP US); F01L 13/0036 (2013.01 - EP US); F01L 2013/0094 (2013.01 - EP US)
Citation (search report)
See references of WO 9842961A1
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
DE 19712668 C1 19980507; EP 0970300 A1 20000112; JP 2000510546 A 20000815; US 6293239 B1 20010925; WO 9842961 A1 19981001
DOCDB simple family (application)
DE 19712668 A 19970326; EP 9801531 W 19980317; EP 98916971 A 19980317; JP 54483798 A 19980317; US 40200499 A 19991213