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:
Mar. 29, 1977
Filed:
May. 07, 1975
Edward A Rishavy, Warren, MI (US);
James H Currie, Rochester, MI (US);
General Motors Corporation, Detroit, MI (US);
Abstract
An internal combustion rotary engine is disclosed having leading and trailing spark plugs with their respective spark electrodes arranged in peripherally spaced ignition openings in the inner peripheral wall of the engine's rotor housing. The leading ignition opening is located in a zone where the leading apex seal of the passing chambers experiences a relatively low pressure differential which decreases in the direction of rotor rotation whereas the trailing ignition opening is located in a zone where the trailing apex seal of the passing chambers also experiences a relatively low pressure differential but which increases in the direction of rotor rotation. Both plugs are fired at the same time by an ignition system that provides a predetermined relatively fast rise time spark ignition potential and an arc of predetermined relatively prolonged duration which is either substantially constant with respect to engine speed or varies inversely therewith and is determined according to the time available from start of ignition to when the trailing apex seal of the passing chambers reaches the trailing plug.