Patent ID: 7514847
Filing Date: 2009-04-07
Classification: F02M,H01L

Abstract:
1. A piezo actuator for a fuel injection valve which is inserted under pre-stressing into an actuator housing, with a compensation element to compensate for the different thermally-induced changes in length in relation to the actuator housing being incorporated between the piezo actuator and a top plate of the actuator housing, wherein the piezo actuator is arranged within a tubular spring, the compensating element is embodied as a compensating cylinder arranged within an extension tube, the actuator housing comprises a sleeve consisting of the tubular spring and the extension tube fixed to it, the extension tube end of which is permanently connected to the top plate and the tubular spring end of which, in exerting a defined pre-stressing on the parts arranged axially behind each other within the sleeve, is permanently connected to a base plate of the actuator housing.