Internal-combustion engines – Poppet valve operating mechanism – Cam
Reexamination Certificate
2011-07-19
2011-07-19
Chang, Ching (Department: 3748)
Internal-combustion engines
Poppet valve operating mechanism
Cam
C123S090160, C123S090440, C029S888100
Reexamination Certificate
active
07980217
ABSTRACT:
A valve train of an internal combustion engine with at least one camshaft (1) on which at least one rotatable cam (2) is arranged fixed in the axial direction, wherein a rotationally fixed connection of the at least one cam (2) with the camshaft (3) can be selectively established and released by an associated coupling-like locking device (3). So that the valve train has a compact construction and low production costs and nevertheless low wear in operation, it is provided that the locking device (3) is held within the cam (2) and has a spring-loaded, annular locking collar (12) that can move in the axial direction on the camshaft (1) and, as a counter part to the locking collar (12), locking shoes (11, 11′) coupled with the cam (2), wherein, in a locking position, the locking collar (12) is pressed against the locking shoes (11, 11′) by contacting, ramp-shaped boundary surfaces (19, 20) formed on the locking collar (12) and the locking shoes (11, 11′), so that radial projections (15) arranged on the locking shoes (11, 11′) engage in adjacent, pocket-shaped receptacles (16) of the camshaft (2) by a radial force and, in an unlocked position, the locking collar (12) is released from the locking shoes (11, 11′) by a force acting against the radial force.
REFERENCES:
patent: 5158049 (1992-10-01), Neumann
patent: 5239885 (1993-08-01), Voigt
patent: 5645022 (1997-07-01), Yamamoto et al.
patent: 6725818 (2004-04-01), Methley
patent: 7114473 (2006-10-01), Taki
patent: 2007/0034184 (2007-02-01), Dengler
Evans Matthew
Gresley Ross A.
Kang Bogyu
Lee Brian
Stallmann John
Chang Ching
Schaeffler Technologies GmbH & Co. KG
Volpe and Koenig P.C.
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