Scavenging arrangement for a two-stroke internal combustion piston engine

US4373474A · kind A · utility

Assignee

• Ficht GmbH · DE

Inventors

• Manfred Schindler · Borgo San Lazzaro, DE
• Reinhold Ficht · Kirchseeon, DE
• Hermann Vogt · Eichstätt, DE

Key dates

• Filing date: Dec 29, 1980
• Grant date: Feb 15, 1983
• Expiry date: Dec 29, 2000

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02B2075/025
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

In a two-stroke internal combustion piston engine, a piston is reciprocally movable within an axially elongated cylinder. The piston has a bottom dead center position and in the region of this position, the cylinder has an exhaust opening and a number of pairs of scavenging openings. An axially extending plane within the cylinder divides the exhaust opening in half and in each pair the scavenging openings are arranged symmetrically on opposite sides of the axially extending plane. Each pair of scavenging openings is located at a different distance from the exhaust opening. The projection of the side surfaces of the pairs of scavenging openings extending in the axial direction of the cylinder each form a different angle at the point of intersection of the projections and the point of intersection is directed away from the exhaust opening. The projection of the side surfaces of the pairs of scavenging openings extending transversely of the axial direction form different angles with a plane extending perpendicularly of the axial direction of the cylinder.