| 摘要 |
PROBLEM TO BE SOLVED: To provide a knock sensor and its manufacturing method that stabilize the output characteristics and detection sensitivity by accurately applying a predetermined preload to a piezoelectric element, eliminate short circuit failure by metal chips, and can reduce the cost by reducing the component cost and simplifying the assembling. SOLUTION: In the knock sensor 1, a component formed of an annular piezoelectric element 4, terminal plates 5 and 6, insulated sheets 7 and 8, and a weight 9 is inserted into a base 2 formed of a flange section 2a and a cylinder section 2b. A groove 16 is formed in the outer peripheral surface of the tip of the cylinder section, a stopper ring 10 for applying an axial preload to the component is inserted into the cylinder section, and the stopper ring and the cylinder section are caulked at the groove. COPYRIGHT: (C)2006,JPO&NCIPI
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