Internal-combustion engines – Poppet valve operating mechanism – With means for varying timing
Reexamination Certificate
2002-09-30
2003-08-05
Denion, Thomas (Department: 3748)
Internal-combustion engines
Poppet valve operating mechanism
With means for varying timing
C123S090160, C123S090120
Reexamination Certificate
active
06601553
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to multicylinder internal-combustion engines of the type comprising:
at least one intake valve and at least one exhaust valve for each cylinder, each valve being provided with respective elastic return means, which push the valve towards a closed position for controlling respective intake and exhaust pipes; and
at least one camshaft, for activating the intake and exhaust valves of the engine cylinders by means of respective tappets;
in which each intake valve is controlled by the respective tappet against the action of the aforesaid elastic return means by interposition of hydraulic means that include a pressurized fluid chamber;
said pressurized fluid chamber being designed to be connected by means of a solenoid valve to an exhaust channel in order to uncouple the valve from the respective tappet and bring about fast closing of the valve as a result of the respective elastic return means;
electronic control means for controlling each solenoid valve so as to vary the time and the opening stroke of the respective intake valve according to one or more operating parameters of the engine;
in which the hydraulic control means for controlling the intake valves of the engine and the solenoid valves associated thereto form part of a pre-assembled unit mounted on the engine cylinder head.
An engine of the type specified above is, for example, described and illustrated in the European patent application EP-A-0 803 642 in the name of the present applicant.
SUMMARY OF THE INVENTION
The purpose of the present invention is to further improve the device described above.
With a view to achieving the above purpose, the subject of the present invention is a multicylinder engine having all the aforementioned characteristics and further comprising the characteristics that form the subject of the characterizing part of the annexed claim
1
.
REFERENCES:
patent: 5839400 (1998-11-01), Vattaneo et al.
patent: 6138621 (2000-10-01), Albanello et al.
patent: 6227154 (2001-05-01), Wakeman
Macor Lorentino
Pecori Andrea
Vattaneo Francesco
C.R.F. Societa Consortile per Azioni
Denion Thomas
Riddle Kyle
LandOfFree
MULTICYLINDER INTERNAL-COMBUSTION ENGINE WITH ELECTRONICALLY... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with MULTICYLINDER INTERNAL-COMBUSTION ENGINE WITH ELECTRONICALLY..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and MULTICYLINDER INTERNAL-COMBUSTION ENGINE WITH ELECTRONICALLY... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3089383