PIEZO ACTUATOR FOR A FUEL INJECTOR, AND FUEL INJECTOR

摘要

A piezo actuator for a fuel injector, including: a piezo layer stack having a longitudinal extension; and an insulation layer surrounding the piezo layer stack. The insulation layer has an insulation layer outer surface, facing away from the piezo layer stack, which defines an outer diameter of the insulation layer. In addition, a preloading device for preloading the piezo layer stack is also provided along the longitudinal extension, wherein the preloading device has a preloading device inner surface, facing towards the piezo layer stack, which defines an inner diameter of the preloading device. In a non-assembled state, the outer diameter of the insulation layer is greater that the inner diameter of the preloading device, such that, in an assembled state, the insulation layer is compressed in the preloading device. The invention also relates to a fuel injector having said piezo actuator.

主权项

1. A piezo actuator for a fuel injector comprising:
a piezo layer stack having a longitudinal extension, an insulation layer surrounding the piezo layer stack and having an insulation layer outer surface (58) which faces away from the piezo layer stack and defines an outer diameter of the insulation layer, a preloading device for preloading the piezo layer stack along the longitudinal extension, wherein the preloading device has a preloading device inner surface which faces the piezo layer stack and defines an inner diameter of the preloading device,wherein, in a non-assembled state, the outer diameter of the insulation layer is greater than the inner diameter of the preloading device, and in an assembled state, the insulation layer is compressed in the preloading device.