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:
Nov. 10, 2015
Filed:
Feb. 24, 2011
Tomohiro Hirata, Komaki, JP;
Takuma Nomura, Komaki, JP;
Tomohiro Hirata, Komaki, JP;
Takuma Nomura, Komaki, JP;
NGK SPARK PLUG CO., LTD., Aichi, JP;
Abstract
There is provided a knocking sensor that has good insulation characteristics even at an operating temperature of 150° C. or more and is excellent in the accuracy of knocking detection. The knocking sensorincludes a sensor bodyincluding: a metal shellthat includes a cylindrical portionand a flange portionpositioned at one end of the cylindrical portionand protruding outward in a radial direction; an annular piezoelectric element; upper and lower electrode platesandthat are superimposed on upper and lower surfaces of the piezoelectric element; a weightthat is disposed so that the piezoelectric elementis interposed between the weight and the flange portion; a lower insulating platethat is disposed between the flange portionand the lower electrode plate; and an upper insulating platethat is disposed between the upper electrode plateand the weight; and a resin moldingthat covers the sensor body. Further, the thickness of each of the upper and lower insulating platesandis in the range of 0.05 mm to 0.50 mm, and the resin moldingis made of polyphenylene sulfide having good heat resistance.