Internal-combustion engines – Particular piston and enclosing cylinder construction – Cylinder detail
Patent
1988-05-24
1989-07-18
Cross, E. Rollins
Internal-combustion engines
Particular piston and enclosing cylinder construction
Cylinder detail
123193CP, F16J 104
Patent
active
048482919
ABSTRACT:
The heat-insulating piston structure according to the present invention is formed by fixing a piston head, which consists of a material the coefficient of thermal expansion of which is substantially equal to that of a ceramic material, to a piston skirt, and setting a thin, flat plate portion of a ceramic material on the whole of the flat surface of the piston head which is on the side of a combustion chamber via a heat-insulating member. Accordingly, the piston can be formed so that it has excellent heat-insulating characteristics and high thermal resistance, deformation resistance and corrosion resistance. Especially, the thin plate portion of a ceramic material, which is exposed to a combustion gas, can be formed to the smallest possible thickness to reduce the thermal capacity thereof greatly. Therefore, the temperature of the wall of the combustion chamber varies easily with that of the combustion gas (in other words, the amplitude of the temperature of this wall becomes large). Consequently, a difference between the temperature of the thin plate portion of a ceramic material and those of the gases (combustion gas and suction air) becomes small momentarily, so that the heat transfer rate of the thin plate portion decreases. This causes a decrease in the quantity of heat which the suction air receives from the wall surface. As a result, the suction air smoothly enters the combustion chamber without being expanded therein. This enables the suction efficiency and cycle efficiency to be improved.
REFERENCES:
patent: 4590901 (1986-05-01), Mizuhara
patent: 4649806 (1987-03-01), Hartsock
patent: 4667627 (1987-05-01), Matsui et al.
patent: 4694813 (1987-09-01), Mielke
patent: 4709621 (1987-12-01), Matsui et al.
patent: 4735128 (1988-04-01), Mahrus
patent: 4739738 (1988-04-01), Sander et al.
patent: 4774926 (1988-10-01), Adams
patent: 4798770 (1989-01-01), Donomoto et al.
Kawamura Hideo
Matsuoka Hiroshi
Cross E. Rollins
Isuzu Motors Limited
LandOfFree
Heat-insulating piston structure does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Heat-insulating piston structure, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Heat-insulating piston structure will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-163122