Title:
KNOCKING SENSOR
Document Type and Number:
WIPO Patent Application WO/2012/157153
Kind Code:
A1
Abstract:
Provided is a knocking sensor having good insulation characteristics even at an operating temperature of 150 °C or more and being excellent in knocking detection characteristics.
The knocking sensor comprises a sensor main body (10) and a resin molded body (30). The sensor main body (10) has a main body metal fitting (11) including a cylindrical portion (11A) and a flange portion (11B), a piezoelectric element (14), a weight (17) disposed on the flange portion (11B) through the piezoelectric element (14), a flange-portion-side electrode plate (13) disposed between the piezoelectric element (14) and the flange portion (11B), a weight-side electrode plate (15) disposed between the piezoelectric element (14) and the weight (17), a flange-portion-side insulating plate (12) disposed between the flange portion (11B) and the flange-portion-side electrode plate (13), and a weight-side insulating plate (16) disposed between the weight (17) and the weight-side electrode plate (15). The resin molded body (30) is made of a resin and covers the sensor main body (10). The resin molded body (30) is made of PPS, and the flange-portion-side insulating plate (12) and the weight-side insulating plate (16) are made of a resin not including an ester bond, thereby suppressing the change of sensor capacity by temperature and suppressing the reduction of knocking detection accuracy.
Inventors:
KUNO HIROYUKI (JP)
AOI KATSUKI (JP)
AOI KATSUKI (JP)
Application Number:
PCT/JP2012/000796
Publication Date:
November 22, 2012
Filing Date:
February 07, 2012
Export Citation:
Assignee:
NGK SPARK PLUG CO (JP)
KUNO HIROYUKI (JP)
AOI KATSUKI (JP)
KUNO HIROYUKI (JP)
AOI KATSUKI (JP)
International Classes:
G01H17/00; G01L23/22
Foreign References:
| JP2003322580A | 2003-11-14 | |||
| JP2010271321A | 2010-12-02 | |||
| JP2004251792A | 2004-09-09 | |||
| JPH01262336A | 1989-10-19 | |||
| JP2010267526A | 2010-11-25 | |||
| JP2008144677A | 2008-06-26 | |||
| JP2003322580A | 2003-11-14 | |||
| JP2008144677A | 2008-06-26 |
Other References:
"Kagaku Binran Kiso Hen", THE CHEMICAL SOCIETY OF JAPAN, vol. 5TH, - 20 February 2004 (2004-02-20), pages I-715 - I-717, XP008172123
See also references of EP 2708860A4
See also references of EP 2708860A4
Attorney, Agent or Firm:
AOKI, Noboru et al. (JP)
Aoki 昇 (JP)
Aoki 昇 (JP)
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Claims: