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. 19, 2016
Filed:
Jan. 31, 2013
Makita Corporation, Aichi, JP;
Kenji Imafuku, Hanno, JP;
MAKITA CORPORATION, Aichi, JP;
Abstract
There is provided a two-stroke engine configured to effectively prevent blow-by of the scavenging air from the discharge port and to be able to improve the engine output while abating pollution. The two-stroke engine includes a cylinder having an exhaust port and a scavenging port, and a piston, wherein: the piston has a top surface; a piston concave portion is provided in the top surface in the discharge direction; an entire surface of the piston concave portion is formed in an approximately spherical shape; and a slope of the piston concave portion extending from an outer circumferential edge of the piston concave portion in the discharge direction to a deepest portion is steeper than a slope of the piston concave portion extending from an outer circumferential edge of the piston concave portion in the anti-discharge direction to the deepest portion.