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:
Feb. 23, 2021
Filed:
Aug. 28, 2019
Applicant:
Yamabiko Corporation, Tokyo, JP;
Inventors:
Assignee:
YAMABIKO CORPORATION, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F02F 3/24 (2006.01); F02F 1/22 (2006.01); F02B 25/14 (2006.01); F02B 63/02 (2006.01); F02B 75/02 (2006.01); F02F 7/00 (2006.01); F02B 25/18 (2006.01);
U.S. Cl.
CPC ...
F02F 3/24 (2013.01); F02B 25/14 (2013.01); F02B 25/18 (2013.01); F02B 63/02 (2013.01); F02B 75/02 (2013.01); F02F 1/22 (2013.01); F02F 7/0036 (2013.01); F02B 2075/025 (2013.01); F02B 2710/036 (2013.01);
Abstract
Provided is a stratified scavenging engine and a portable work machine that suppress THC sufficiently. A stratified scavenging engine includes: a cylinder having a cylinder bore; and a piston stored in the cylinder bore to be movable in a reciprocating manner. The cylinder has an intake port to intake leading air and a scavenging port to scavenge combustion gas, the intake port and the scavenging port being open to the cylinder bore. The piston has a peripheral surface including a piston groove to guide leading air from the intake port to the scavenging port, and the piston groove has a recess near the intake port.