| 摘要 |
In a knocking sensor, including: a metal shell having a cylindrical portion, and a flange portion that is located on 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, an annular piezoelectric element that is fitted onto an 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, a protruding portion that is protruded while being plastically deformed from an inner surface of the cylindrical portion outward in a circumferential direction, and locks the weight in contact with the upper surface of the weight directly or through a member is disposed on an outer circumferential surface of the cylindrical portion. |
| 主权项 |
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. |
