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:
Apr. 17, 1990
Filed:
Jan. 24, 1989
Ferdinand Freudenstein, Bronx, NY (US);
Wayne J Sohn, Teaneck, NJ (US);
The Trustees of Columbia University in the City of New York, New York, NY (US);
Abstract
Novel internal-combustion engines of the swing beam type incorporate an improved construction utilizing a Rapson slide motion and also are derived from two or three degree of freedom mechanisms for controlling the displacement of the piston as a function of crankshaft displacement and of the displacement of a control shaft. The control shaft either operates at an average speed which is preferably a prescribed ratio of crank speed, thereby yielding an improved thermodynamic cycle (such as the Atkinson cycle in the case of a four-stroke engine) and cycle timing, or functions as a lever for obtaining variable stroke operation. The mechanism can also incorporate a continuously rotating control shaft together with a second control shaft functioning as a lever, thereby yielding an improved thermodynamic cyle and cycle timing together with variable stroke operation. The control shaft, functioning as a lever, can be replaced by a similar actuating device. The mechanism can also incorporate a variable compression ratio feature.