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Patent Searching and Data


Title:
KNOCKING SENSOR
Document Type and Number:
WIPO Patent Application WO/2012/114380
Kind Code:
A1
Abstract:
Provided is a knocking sensor having favorable insulation properties even at usage temperatures of 150°C and higher, and having superior knocking detection precision. A knocking sensor (10) comprises a sensor body (20) and a resin molding (11) for covering the sensor body (20), the sensor body having a main metal fitting (12) including a tubular part (12a) and a flange part (12b) which projects toward the outside in the radial direction while also being positioned on one end of the tubular part (12a), an annular piezoelectric element (15), an upper electrode plate (16) and lower electrode plate (14) superimposed on the upper surface and lower surface of the piezoelectric element (15), a weight (17) sandwiching the piezoelectric element (15) with the flange part (12b), a lower insulating plate (13) disposed between the flange part (12b) and the lower electrode plate (14), and an upper insulating plate (13t) disposed between the upper electrode plate (16) and the weight (17). The thicknesses of the upper insulating plate (16) and the lower insulating plate (14) are within the range of 0.05-0.50 mm. The resin molding (11) is constituted of a polyphenylene sulfide having favorable heat resistance.

Inventors:
HIRATA, Tomohiro (C/O NGK SPARK PLUG CO. LTD, 14-18, Takatsuji-cho, Mizuho-ku, Nagoya-sh, Aichi 25, 〒4678525, JP)
平田 智大 (〒25 愛知県名古屋市瑞穂区高辻町14番18号日本特殊陶業株式会社内 Aichi, 〒4678525, JP)
Application Number:
JP2011/001056
Publication Date:
August 30, 2012
Filing Date:
February 24, 2011
Export Citation:
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Assignee:
NGK SPARK PLUG CO., LTD. (14-18, Takatsuji-cho Mizuho-ku, Nagoya-sh, Aichi 25, 〒4678525, JP)
日本特殊陶業株式会社 (〒25 愛知県名古屋市瑞穂区高辻町14番18号 Aichi, 〒4678525, JP)
HIRATA, Tomohiro (C/O NGK SPARK PLUG CO. LTD, 14-18, Takatsuji-cho, Mizuho-ku, Nagoya-sh, Aichi 25, 〒4678525, JP)
International Classes:
G01H17/00; F02D35/00; G01L23/22
Foreign References:
JP2005292123A
JPH01262336A
JP2006010624A
JP2003065998A
JPH10267747A
Attorney, Agent or Firm:
AOKI, Noboru et al. (C/O NGK SPARK PLUG CO. LTD, 2808 Oaza-Iwasaki, Komaki-shi, Aichi 10, 〒4858510, JP)
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Claims: