Heat-insulating structure of swirl chamber

Details Heat-insulating structure of swirl chamber Heat-insulating structure of swirl chamber

1990-07-27

1991-05-14

Wolfe, Willis R.

Internal-combustion engines

Precombustion and main combustion chambers in series

Precombustion chamber liner or coating

123254, 29888061, F02B 1908, F02B 1916

Patent

active

050146645

ABSTRACT:
A heat-insulating structure of a swirl chamber of this invention comprises ceramic swirl chamber blocks for forming swirl chambers, heat-insulating layers disposed outside the swirl chamber blocks and reducing the heat-insulating degree of the portions of the swirl chamber blocks, at which a temperature becomes high, much more than at other portions, and metallic outer blocks disposed by casting to the outer surface of the heat-insulating layers and the exposed outer surfaces of the swirl chamber blocks. Accordingly, a high heat-insulating structure of a swirl chamber can be obtained even when the swirl chamber blocks are not made of a material having a low thermal transfer rate, and the temperature distribution of the swirl chamber block can be freely controlled to the optimum condition. Moreover, compressive force is imparted to the swirl chamber blocks by shrinkage at the time of cooling of the outer blocks so as to secure the strength of the swirl chamber blocks. Particularly, the compressive force acting on the swirl chamber blocks as a whole is regulated by increasing the thickness of the portions of the swirl chamber blocks, on which the excessive compressive force acts, or reducing the density of the heat-insulating layers so as to secure the strength of the swirl chamber blocks.

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"Manufacturing Method of Subchamber for Engine" Patent Abstract of Japan, vol. 10, No. 257 (M-513) (2313) Sep. 3, 1986 & JP-A-61 83451 (Mazda Motor Corp) Apr. 28, 1986.
"Manufacturing Method of Engine Subchamber" Patent Abstracts of Japan, vol. 10, No. 270 (M-517) (2326) Sep. 13, 1986 & JP-A-61 93227 (Mazda Motor Corp.) May 12, 1986.

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