The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 08, 2001
Filed:
Mar. 22, 2000
Russell John Wakeman, Canton, MI (US);
Ricardo Inc., Belleville, MI (US);
Abstract
A valvegear for an engine of reciprocating piston type is disclosed. The valve gear includes a cam, a camshaft and a cam piston, where the cam is mounted to rotate on the camshaft and is in contact with the cam piston. The cam piston is movably arranged within a pressure chamber and is adapted to be moved by the cam away from the camshaft to pressurize a fluid within the pressure chamber. The valvegear further includes an engine valve which is movable between an open position and a closed portion, a restoring spring associated with each engine valve, a valve piston which is movable arranged in an actuating chamber, the engine valve is arranged to be moved into the open position against the force of the restoring spring by the valve piston, where the valve piston is arranged to move in the actuating chamber by the pressure produced in said pressure chamber by movement of said cam piston. The valvegear further includes an accumulator piston which is arranged within an accumulator chamber and is associated with an accumulator spring, the accumulator piston is arranged to be moved against the force of the accumulator spring by the pressure acting in the accumulator chamber. The valvegear further includes first selectively operable valve means arranged to connect the pressure chamber and the accumulator chamber, control means, and second selectively operable valve means, which is connected to the control means and is arranged to connect the pressure chamber to the actuating chamber.