TWO-STROKE ENGINE TRANSFER PORTS - HOMELITE TECHNOLOGIES LTD

Title:

TWO-STROKE ENGINE TRANSFER PORTS

Document Type and Number:

WIPO Patent Application WO2004033869

Kind Code:

A3

Abstract:

A two-stroke internal combustion engine (10) including a cylinder (12); and a piston (14) movably mounted in the cylinder (12). The cylinder (12) includes an exhaust port (34) and transfer ports (36). The transfer ports (36) include a first pair of the transfer ports (44, 48) disposed closer to the exhaust port (34)than a second pair of the transfer ports (46, 50) which are disposed further away from the exhaust port (34). The first pair of transfer ports (44, 48) are angled relative to each other at a first angle of about 70° to about 85 ° and the second pair of transfer ports (46, 50) are angled relative to each other at a second angle of about 120° to about 150°. Directional discharge of scavenged air out of the transfer ports (36) establishes a flow path for the scavenged air to minimize losses of the fresh unburned fuel into the exhaust port (34).

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Inventors:

SHELDON JOHN D (US)
MAVINAHALLY NAGESH S (US)

Application Number:

PCT/US2003/031470

Publication Date:

September 23, 2004

Filing Date:

October 06, 2003

Export Citation:

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Assignee:

HOMELITE TECHNOLOGIES LTD
SHELDON JOHN D (US)
MAVINAHALLY NAGESH S (US)

International Classes:

F02B25/14; F02B25/20; F02B33/04; F02B63/02; F02B75/02; (IPC1-7): F02B33/04

Foreign References:

US6223705B1	2001-05-01
US5870981A	1999-02-16

Other References: