Piezo-electric actuator module for fuel injection valve of air compressed, automatic ignition internal combustion engine, has outer layer for coating actuator body and transition pieces, where layer is made of molded thermosetting material

摘要

The module (2) has an actuator body (23) including multiple ceramic layers (26, 27) and multiple electrode layers (28, 29) that are arranged between the ceramic layers. Transition pieces (24, 25) are attached to the actuator body, and an outer layer coats the actuator body and the transition pieces, where the outer layer is made of molded thermosetting material e.g. epoxide low-pressure molding material, by implementing an injection-press process. An elastic and volume compressible intermediate layer is formed from a solution with a micro hollow ball.