Cylindrical spring especially as bias or reaction spring for piezoelectric multilayer actuator in diesel common rail injector

摘要

The cylindrical spring has a one-piece hollow cylindrical base body, spring arms (1,2) formed in the walls of the cylinder and divided with at least dual rotation symmetry with respect to the cylinder axis and terminating rings (3,5,31,51) joining the spring arm ends. The spring arms are mirrored at a mirror plane located at the centre of the axial longitudinal extent of the spring body and perpendicular to the cylinder axis, are joined via a centre ring (4,41) in the mirror plane and are joined approximately perpendicularly to the terminating rings and the centre ring.