Internal-combustion engines – Poppet valve operating mechanism – With means for varying timing
Reexamination Certificate
2009-08-07
2011-10-25
Denion, Thomas (Department: 3748)
Internal-combustion engines
Poppet valve operating mechanism
With means for varying timing
C123S090120, C123S090440, C123S321000
Reexamination Certificate
active
08042502
ABSTRACT:
A valve drive with a decompression brake for an internal combustion engine, which has a camshaft with a cam, a rocker arm for transmitting the cam stroke to a gas exchange valve, a pivot bearing supporting the rocker arm, and a hydraulic valve play compensating element arranged in force flow between the cam and gas exchange valve. The valve play compensating element is fixed in the engine and valve drive also has a secondary lever with a first and second lever section. The secondary lever is angularly connected, between the lever sections, to a lever support formed on the rocker arm, is supported with the first lever section on the valve play compensating element and actuates the gas exchange valve by the second lever section. The effective lever arm of the first lever section is considerably greater than the effective lever arm of the second lever section.
REFERENCES:
patent: 1931476 (1933-10-01), Hallett
patent: 5682847 (1997-11-01), Hara
patent: 6257201 (2001-07-01), Kajiura et al.
patent: 2009/0107428 (2009-04-01), Magnan et al.
Bernstein Daniel
Denion Thomas
Lucas & Mercanti LLP
Schaeffler KG
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