Charge output element and annular shear piezoelectric acceleration sensor

A charge output element, comprising:

• a base, comprising a supporting part and a cylindrical connecting part arranged on the supporting part, wherein the connecting part is provided with mounting holes axially extending along the connecting part;
• a piezoelectric element, sleeved outside the connecting part, wherein a circular gap is formed between the piezoelectric element and the connecting part;
• a mass block, sleeved outside the piezoelectric element and arranged above the supporting part in a suspended manner;
• pre-tightening members, inserted into the circular gap, wherein the pre-tightening members are circularly distributed within the circular gap, the pre-tightening member comprises a first end and a second end which are opposite to each other, the second end is close to the supporting part, and the thickness of the first end is larger than the thickness of the second end;
• and
• a locking member, comprising a columnar part and a stop part which are connected with each other, wherein the columnar part cooperates with the mounting hole to fasten the above elements, the stop part butts against the first end, such that the pre-tightening member provides a radial pretightening force to fasten the piezoelectric element, the mass block and the base.