Global Patent Index - EP 0970300 A1

EP 0970300 A1 2000-01-12 - 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

EP 0970300 A1 (DE)

Application

EP 98916971 A

Priority

  • DE 19712668 A
  • EP 9801531 W

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 (main, further and additional classification)

F01L 13/00; F01L 1/14

IPC 8 full level (invention and additional information)

F01L 1/14 (2006.01); F01L 1/24 (2006.01); F01L 13/00 (2006.01)

CPC (invention and additional information)

F01L 1/143 (2013.01); F01L 13/0005 (2013.01); F01L 13/0036 (2013.01); F01L 2013/0094 (2013.01)

Citation (search report)

See references of WO 9842961A1

Designated contracting state (EPC)

DE FR GB IT

EPO simple patent family

DE 19712668 C1 19980507; EP 0970300 A1 20000112; JP 2000510546 A 20000815; US 6293239 B1 20010925; WO 9842961 A1 19981001

INPADOC legal status


2002-09-11 [18W] WITHDRAWN

- Date of withdrawal: 20020718

2001-05-23 [17Q] FIRST EXAMINATION REPORT

- Effective date: 20010406

2000-01-12 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 19990821

2000-01-12 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): DE FR GB IT