Internal-combustion engines – Adjustable combustion chamber – Piston in head adjusted
Patent
1994-08-30
1995-06-27
Yuen, Henry C.
Internal-combustion engines
Adjustable combustion chamber
Piston in head adjusted
123 48AA, F22B 7504
Patent
active
054270634
ABSTRACT:
An internal combustion engine having at least one volume adjustable cylinder which automatically adjusts its compression ratio during operation. The volume adjustable cylinder includes a movable head insert placed inside the insert space formed on the engine head directly over the piston. An adjustable lock nut is used to attach the head insert to the engine head and to initially set the position of the head insert in the insert space to establish the initial volume of the combustion chamber of the cylinder. An O-ring made of elastomeric material is disposed between the head insert and the inside surface of the engine head which resists movment of the head insert in the insert space. When the engine operates at higher RPMs, the compression pressure increases inside the cylinder which forces the head insert into the insert space to expand the volume of the combustion chamber which, in turn, reduces the combustion pressure of the cylinder. A lip structure or stop pins are formed on the head insert which limit the movement of the head insert in the insert space.
REFERENCES:
patent: 1979746 (1934-11-01), Kenneweg
patent: 2367894 (1945-01-01), Shore
patent: 2733694 (1956-02-01), Brebeck
patent: 4137873 (1979-02-01), Caswell, Sr.
patent: 4148284 (1979-04-01), Prosen
patent: 4190024 (1980-02-01), Davis
patent: 4241703 (1980-12-01), Lin-Liaw
patent: 4406116 (1983-09-01), Burnham
patent: 5341771 (1994-08-01), Riley
Macy M.
Yuen Henry C.
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