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:
Jun. 13, 1989
Filed:
Mar. 23, 1988
Isao Oda, Nagoya, JP;
Kiminari Kato, Nagoya, JP;
NGK Insulators, Ltd., , JP;
Abstract
Ceramic rotors for pressure wave superchargers are disclosed, which have a honeycomb structure, wherein a material constituting partition walls of the honeycomb structure has an apparent density of 4.0 g/cm.sup.3 or less, an open porosity of 3.0% or less, a coefficient of thermal expansion in a temperature range from room temperature to 800.degree. C. being 5.5.times.10.sup.-6 /.degree.C. or less, and a four point bending strength of 30 kg/mm.sup.2 or more. A process for producing such ceramic rotors for pressure wave superchargers is also disclosed. The process includes the steps of preparing a ceramic body in which an average particle diameter of a ceramic raw material is controlled to 1 to 10 .mu.m, extruding honeycomb structural bodies by press feeding the ceramic body through body feed holes and extruding channels having a width corresponding to a thickness of partition walls of the honeycomb structure in an extruding die, drying, firing and grinding the thus extruded bodies.