Patent ID: 9291518
Filing Date: 2016-03-22
CPC Classification: F02P,G01L

Claim Text:
1. A knocking sensor, comprising: a metal shell having a cylindrical portion, and a flange portion that is located on one end side of the cylindrical portion and projected toward an outside of the cylindrical portion in a circumferential direction; an annular weight that is fitted onto an outer circumference of the cylindrical portion, and has an upper surface on an opposite side of a side facing the flange portion; an annular piezoelectric element that is fitted onto the outer circumference of the cylindrical portion, and interposed between the flange portion and the weight; and an insulating body that is interposed between the flange portion and the piezoelectric element, wherein a protruding portion that is protruded while being plastically deformed from an inner circumferential surface of the cylindrical portion outward in a circumferential direction, and contacts the upper surface of the weight to lock the weight is disposed on an outer circumferential surface of the cylindrical portion, wherein a plating layer is disposed on the outer circumferential surface of the cylindrical portion.