Two-stroke motor with an improved transfer port

Details Two-stroke motor with an improved transfer port Two-stroke motor with an improved transfer port

2007-08-29

2009-06-09

Kamen, Noah (Department: 3741)

Internal-combustion engines

Two-cycle

Rear compression

C123S0650PD

Reexamination Certificate

active

07543554

ABSTRACT:
In order to provide a two-stroke motor, in particular for a portable, hand-guided working device with a combustion space formed in a cylinder and a piston guided in the cylinder so that it performs a lifting movement, at least one transfer port is provided which is formed at least from a combustion-space-side opening section, a rising section and a crankcase-space-side inlet section. The opening section is connected to the inlet section by the rising section arranged approximately parallel to the piston barrel. The motor has a small flow resistance because of its geometric design, despite maintaining small opening windows into the combustion space, and allows simple casting production. The transfer port forms in the inlet section a whole port which passes in a single-flow manner into the rising section and is divided by a division at least into a first partial port and a second partial port at least in the upper region of the rising section adjoining the opening section.

REFERENCES:
patent: 2406404 (1946-08-01), Ryde
patent: 3494335 (1970-02-01), Meier
patent: 4051820 (1977-10-01), Boyesen
patent: 822 316 (1951-11-01), None
patent: 102 23 069 (2002-05-01), None
patent: 1 574 683 (2003-12-01), None
patent: 102005019520 (2005-04-01), None

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