Piezoelectric element stack of piezoelectric injector used for injection of fuel into internal combustion engine, has caps that are partly formed as bellows to which tubular seal and end pieces are connected

摘要

The piezoelectric element stack (3) has a protective layer system (4), having an insulating layer (5) and a metal seal (6). The metal seal is tubular in shape and is arranged along the longitudinal ends of closed caps (7). The caps are partly formed as bellows to which the tubular seal and the end pieces (8) of the piezoelectric element stack are connected.