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:
Aug. 17, 1999
Filed:
Nov. 21, 1997
Yasuo Ito, Nagoya, JP;
Yoshitaka Fujikawa, Nagoya, JP;
NGK Spark Plug Co., Ltd., Nagoya, JP;
Abstract
A knocking detecting sensor (1) includes a piezoelectric element plate (8) for detecting vibration due to knocking generated in an internal combustion engine and a main metallic sleeve (5) for supporting the piezoelectric element plate (8) on the side of one face. The sensor (1) is attached to a prescribed attaching unit (30) of an internal combustion engine. The piezoelectric element plate (8) is formed in a flat axis-symmetrical shape at a position relative to an axial line (O) that is substantially orthogonal to the attaching face (30a) of the attaching unit (30). The main metallic shell (5) has an opposite face (35) to the attaching face (30a) of the attaching unit (30), and has a notch portion (37) opening toward the opposite face (35) at a position a prescribed distance away from the axial line (O). By providing the notch portion (37), the center of gravity (G) of the sensor (1) can be corrected so that it approaches the axial line (O).