Two-stroke internal combustion engine

Patent metadata

Field	Value
Publication number	US-8955475-B2
Application number	US-201414185941-A
Country	US
Kind code	B2
Filing date	Feb 21, 2014
Priority date	Feb 22, 2013
Publication date	Feb 17, 2015
Grant date	Feb 17, 2015

Abstract

The scavenging passage includes a wall surface that defines an orientation direction of a main scavenging gas flow spouting from the scavenging port to the cylinder chamber. In a boundary portion between the scavenging port and the scavenging passage, a wall surface located on an opposite side of the exhaust port is composed of an inclined surface inclined in a direction further away from the exhaust port than a wall surface of a deep portion of the scavenging passage. The scavenging port includes a rear wall surface located in a portion on the opposite side of the exhaust port. The rear wall surface continues to the inclined surface to extend in the direction away from the exhaust port and generates an incidental scavenging gas flow incidental to the main scavenging gas flow and higher in speed than the main scavenging gas flow.

First claim

What is claimed is:

1. A two-stroke internal combustion engine comprising:
a cylinder bore formed in a cylinder;
a piston inserted into the cylinder bore and can move reciprocatably, the piston defining a cylinder chamber in the cylinder bore;
a crankshaft configured to convert a reciprocating motion of the piston into a rotary motion;
a crank chamber configured to house the crankshaft and receive a gas mixture fed from an intake system;
a scavenging port that is open to t…

Assignees

• Yamabiko Corp

Inventors

• Yamazaki Takahiro
• Yamaguchi Shirou
• Shirai Ken
• Nozawa Masaru

Classifications

• F02B25/02 Primary

  Mechanical Engineering · mapped topic

• F02B75/02 Primary

  Mechanical Engineering · mapped topic

• F02B33/04

  Mechanical Engineering · mapped topic

• F02B25/16

  Mechanical Engineering · mapped topic

• F02B2075/025

  Mechanical Engineering · mapped topic