| 摘要 |
PROBLEM TO BE SOLVED: To prevent defective insulation caused by mutual positional shift among components, to reduce assembling manhours required therefor, and to prevent an insulator from being left without being assembled. SOLUTION: This knock sensor 1 is provided with a cylindrical core metal 2 of which the one end serves as a pressure contact face 11 onto a cylinder block 10. An annular piezoelectric element 3 is arranged concentrically in an outer circumference of a cylindrical part 22, and electrode plates 4, 4 are layered on both axial-directional faces thereof. In the electrode plate 4, a piezoelectric element 3 side (inside) face 4A serves as a pressure contact face onto the piezoelectric element 3, an insulating layer 5 is provided on an opposite side (outside) face 4B, and an annular weight 6 is arranged to be overlapped thereon. A connector 13 and a coating body 7 are formed by molding a resin, and the coating body 7 coats outer circumferences of the weight 6, the piezoelectric element 3 and the electrode plates 4, 4 to be insulated and water-proof-coated. COPYRIGHT: (C)2004,JPO&NCIPI
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