Piezoelectric actuator for fuel injection valve of e.g. air compressing, self-ignition internal combustion engine, has intermediate gap formed between actuator body and sealing sleeve and filled with counter-pressure fluid

摘要

The actuator has an actuator body (10) with a set of ceramic layers (11) and a set of electrode layers (12) that are arranged between the ceramic layers. The actuator body is partially surrounded by a sealing sleeve (16). An intermediate gap (21) formed between the body and the sleeve is filled with a counter-pressure fluid (23). The counter-pressure fluid is partially provided in direct contact with the body, so that the body is surrounded partially surrounded by the counter pressure fluid. The sleeve is formed from a shape memory alloy based on nickel and titanium.