| 摘要 |
PURPOSE:To enhance pressure resistance and to stabilize output, by constituting the titled pressure sensor so that pressure applied to a pressure receiving surface is mainly received by a gap holding part and a piezoelectric element receives pressure through a buffer body. CONSTITUTION:A hollow outer shell is formed by gap holding parts 13, 14 for holding the predetermined gap between an upper and a lower pressure receiving parts 11, 12 and an internal electrode plate 15 and piezoelectric elements 16, 17 are laminated in this gap in a closely contacted state. A bellows shaped spring 18 is provided to the under surface of the piezoelectric element 17 through a ring shaped spacer 19 made of a good conductive material such as copper. For example, when the pressure sensor constituted as mentioned above is interposed to the clamp part of the head bolt of an engine, the greater part of clamping torque is added to the above mentioned gap holding parts 13, 14 while pressure to the piezoelectric elements 16, 17 is buffered by the spring 18 and, therefore, a possibility such that the characteristics of the piezoelectric elements 16, 17 are attenuated or said elements are damaged is eliminated. |
