Title: Knock sensor
Application Number: 200610067936 Application Date: 2006.03.20
Publication Number: 1971228 Publication Date: 2007.05.30
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: G01L23/22;G01H17/00
Applicant(s) Name: Mitsubishi Electric Corp. Address:
Inventor(s) Name: Yokoi Akito;Shibata Harumasa
Attorney & Agent: fangxiao gong
Abstract:
    This invention provides a knock sensor can reduce change of pressure retentivity on sensor main body, bring preload to bear on piezoelectric element to make output characteristic and test stability of sensitiveness. A knock sensor includes: a base made up of a flange portion, and a tube portion; a sensor main body including a piezoelectric element that is fitted over an outer peripheral portion of the tube portion; and a stopper ring that is fitted over the outer peripheral portion of the tube portion and cooperates with the flange portion to clamp the sensor main body, a groove being formed on the outer peripheral surface of the tube portion, and the knock sensor being fixed by driving a pressing jig into an outer peripheral surface of the stopper ring to plastically deform the stopper ring and press a protruding portion into the groove, wherein: an axial length of a recess portion that is formed simultaneously on the outer peripheral surface of the stopper ring when the protruding portion is formed is longer than an axial length of the groove.
Time: 11
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