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:
Jul. 24, 1984
Filed:
Dec. 22, 1982
Benjamin L Sheaffer, Oshkosh, WI (US);
Brunswick Corporation, Skokie, IL (US);
Abstract
A crankcase supercharged four cycle engine (10) includes an outside air inlet port (22) positioned so that upon each expansion stroke of the piston (11) a charge of pressurized air is fed to the crankcase (15), and hence through a one-way valve (25) and nozzle (26) into an enclosed surge tank (28). A tuning pipe (30) disposed within the surge tank has an inlet (31) at the nozzle outlet and provides a tuned passage which connects for discharge through a valved port (20, 21) into the engine cylinder (12). On one downward stroke of the piston, air from the outside air inlet port is compressed into the crankcase and is forced through the one-way valve and nozzle to provide a charge of compressed air which is trapped within the surge tank and tuning pipe. On the next downward stroke of the piston, another charge of compressed air is forced through the nozzle and into the tuning pipe inlet. A venturi effect is created which draws the previous charge of air trapped in the surge tank into the tuning pipe, which increases the pressure within the tuning pipe for discharge through the valved port into the engine cylinder.