| 摘要 |
<p>An actuator arrangement comprising a piezoelectric element (22) formed from a piezoelectric material, a first end of the piezoelectric element (22) cooperating with an input piston member (24) slidable within a bore (26). A surface associated with the input piston member (24) defines, in part, a control chamber (32) for fluid, fluid pressure within the control chamber (32) acting on a surface associated with an output piston member (30). The fluid within the control chamber (32) is substantially incompressible such that, in use, movement of the input piston member (24) is transmitted to the output piston member (30), the piezoelectric element (22) being arranged within a second chamber (23) for fluid such that fluid pressure within the second chamber (23) exerts a force on at least a part of the surface of the piezoelectric element (22) which serves to oppose the load exerted on the piezoelectric element (22) due to fluid pressure within the control chamber (32), thereby suppressing distortions in the piezoelectric material. <IMAGE></p> |
