Valves and valve actuation – Mechanical movement actuator – Cam
Reexamination Certificate
2007-12-11
2007-12-11
Jacyna, J. Casimer (Department: 3754)
Valves and valve actuation
Mechanical movement actuator
Cam
C123S090160
Reexamination Certificate
active
10905463
ABSTRACT:
Apparatus and method for controlling valve movements in an internal combustion engine that has at least one inlet valve (12) and at least one exhaust valve for controlling the connection between the combustion chamber in the cylinder and an inlet system and an exhaust system respectively. A rotatable camshaft is provided that has a cam curve including a rising ramp (10a) and a falling ramp (10b) that is designed to interact with a valve mechanism (14) for actuation of the inlet or exhaust valve (12) under the action of a valve spring (13). The valve mechanism (14) includes control members (21, 22, 23, 24, 25and26) that allow return movement of the valve mechanism to be controlled during the closing phase of the inlet valve (12) or the exhaust valve, independently of the falling ramp (10b) of the cam curve. The control members (21, 22, 23, 24, 25and26) are arranged so that the closing of the valve can be delayed for an adjustable period of time by means of a hydraulically adjustable force counteracting the closing force of the valve spring.
REFERENCES:
patent: 3938483 (1976-02-01), Firey
patent: 6170474 (2001-01-01), Israel
patent: 6550435 (2003-04-01), Zubeck
patent: 6647935 (2003-11-01), Aoyama et al.
Jacyna J. Casimer
Novak Druce & Quigg LLP
Volvo Lastvagnar AB
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