The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 14, 1991
Filed:
Jul. 27, 1990
Hiroshi Matsuoka, Yamato, JP;
Isuzu Motors Limited, Tokyo, JP;
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.