Improvement of materials of an actuator with active piston

摘要

The actuator has an outer cylinder (5) made of a positive or zero thermal expansion coefficient material and an inner sliding cylinder (7) made of a zero or negative thermal expansion coefficient material and inserted in the outer cylinder. An active piston comprises sections made of a piezo-electric material and elongated inside the cylinder (7) to move the piston by dry friction inside the cylinder. The inner cylinder is made of zirconium molybdate in a cubic structure, zirconium tungsten phosphate, siliceous faujasite, lutetium tungstate and zirconium tungstate in a cubic phase.