Internal-combustion engines – Poppet valve operating mechanism – With means for varying timing
Reexamination Certificate
2007-11-20
2007-11-20
Denion, Thomas (Department: 3748)
Internal-combustion engines
Poppet valve operating mechanism
With means for varying timing
C123S090200, C123S090150, C123S090170, C123S090430
Reexamination Certificate
active
10551540
ABSTRACT:
The invention relates to a device for the variable actuation of gas exchange valves for internal combustion engines, wherein at least one cam (2) pertaining to a camshaft (1) mounted in a housing rotates according to the engine speed. The cam (2) first drives an intermediate member (4) which performs a clear oscillating, rotary movement and has a rotational axis (7) that can be displaced in the housing parallel to itself along a curve of displacement (8), said intermediate member comprising a control cam (5) having a lifting region (5b) and actuating an output member (11) that, in turn, actuates at least one valve (13). The aim of the invention is to enable one such device to be reliably controlled. To this end, the control cam (5) has a catch region (5a), and the intermediate member (4) is mounted on a bearing having an axis which corresponds to the rotational axis (7), said bearing being arranged in such a way that it is guided in a forced manner and can be displaced parallel to the curve of displacement (8, 28, 35), by means of an articulation (16, 24, 26) connected to the cylinder head or the housing or by a slide (34) that is guided in the housing in a positively locking manner. The invention also relates to a method for operating an internal combustion engine comprising a plurality of cylinders using at least one of the inventive devices.
REFERENCES:
patent: 4572118 (1986-02-01), Baguena
patent: 6481399 (2002-11-01), Morrn
patent: 6792903 (2004-09-01), Morrn
patent: 6886512 (2005-05-01), Naumann
patent: 6907852 (2005-06-01), Schleusener et al.
patent: 7111600 (2006-09-01), Naumann
Busch Christian
Keller Kai-Uwe
Köhne Gordon
Kuhn Peter
Obrist Frank
Denion Thomas
Fogiel Max
Riddle Kyle M.
Thyssenkrupp Automotive AG
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