Apparatus for an internal combustion engine

Details Apparatus for an internal combustion engine Apparatus for an internal combustion engine

2005-01-12

2009-11-03

Eshete, Zelalem (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

Hydraulic system

C123S090150, C123S090160, C251S012000

Reexamination Certificate

active

07610881

ABSTRACT:
A valve actuation system for providing added motion in the valve mechanism of an internal combustion engine with at least one inlet valve and at least one exhaust valve is provided. The valve mechanism includes a rotatable camshaft including rising and falling ramps designed to interact with a valve control plunger inside a cylinder for actuation of the inlet or exhaust valve under the action of a valve spring. The cylinder communicates with a hydraulic fluid feed line via a check valve and with a hydraulic control circuit allowing a return movement of a valve to be delayed in relation to the timing of the corresponding falling ramp. The hydraulic control circuit includes a first and a second hydraulic fluid flow restrictor connected to the control plunger cylinder at different levels along its longitudinal axis. A selector valve enables a connection between the cylinder and hydraulic fluid return line to be opened via either one only or both flow restrictors.

REFERENCES:
patent: 5216988 (1993-06-01), Taxon
patent: 5327858 (1994-07-01), Hausknecht
patent: 6237551 (2001-05-01), Macor et al.
patent: 9706355 (1997-02-01), None
patent: 2004005677 (2004-01-01), None
International Search Report for corresponding International Application PCT/SE2005/000023.

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