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:
Nov. 13, 2001
Filed:
Feb. 22, 1999
Willibald G. Berlinger, Peoria, IL (US);
Caterpillar Inc., Peoria, IL (US);
Abstract
A method of operating a free piston internal combustion engine includes the steps of: providing a housing with a combustion cylinder and a second cylinder, the combustion cylinder having a bore with an inside diameter; providing a piston including a piston head reciprocally disposed within the combustion cylinder, a second head reciprocally disposed within the second cylinder, and a plunger rod interconnecting the piston head with the second head; and moving the piston between a top dead center position and a bottom dead center position during a return stroke, the return stroke having a stroke length between the top dead center position and the bottom dead center position, the moving step being carried out with a bore/stroke ratio represented by a quotient of the inside diameter divided by the stroke length which is between 1.2 and 1.5. An air scavenging port is in fluid communication with the bore during between 50 and 70 percent of a cycle time period.