| 摘要 |
A knock sensor employs a piezoelectric element and includes a ring-shaped weight which has a chamfered surface portion formed at an inner peripheral edge of the weight. The knock sensor basically comprises a housing which includes a disc-shaped flange portion and a cylinder portion covered with an insulating tube. A lower lead plate, the piezoelectric element, an upper lead plate, an insulating sheet, a weight, a disc spring, and a nut are stacked on the flange portion and disposed around the cylinder portion in the order of mention. The nut is tightly screwed to the external thread portion of the cylinder portion to fixedly sandwich the stacked parts with the flange portion of the housing.
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