Internal-combustion engines – Particular piston and enclosing cylinder construction – Cylinder detail
Patent
1988-12-13
1989-09-12
Okonsky, David A.
Internal-combustion engines
Particular piston and enclosing cylinder construction
Cylinder detail
123668, F02B 7508
Patent
active
048649872
ABSTRACT:
In a heat insulating engine of this invention, the piston head is made up of a retainer body, a heat insulating member mounted on the retainer body, and a thin ceramic member formed over the upper surface of the heat insulating member exposed to the burning gas and over the circumference of the former two members. The retainer body is mounted to a piston skirt through a heat insulating gasket. The cylinder is so constructed that the piston head does not contact the cylinder liner upper portion of the head-liner but can contact the cylinder liner lower portion. When the piston is situated close to the top dead center, the heat insulating structure of the combustion chamber prevents heat from being released from the piston head. When the piston is pushed down, the heat of the piston head is released through the cylinder liner lower portion, rapidly reducing the temperature in the combustion chamber, preventing fresh air taken in from thermally expanding and therefore preventing a reduction in the air intake efficiency.
REFERENCES:
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patent: 4328772 (1982-05-01), Heydrich et al.
patent: 4538562 (1985-09-01), Matsui et al.
patent: 4590901 (1986-05-01), Mizuhara
patent: 4646707 (1987-03-01), Pfefferle
patent: 4796572 (1989-01-01), Heydrich
Isuzu Motors Limited
Okonsky David A.
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