Importance

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Abstract

A piston unit of a working cylinder includes a piston rod that has an outer thread on a piston-side coupling portion. A piston has an axial bore which has an inner thread and in which the piston rod is received. The outer thread and the inner thread define a common thread portion. The outer thread and the inner thread have a complementary conicity and a complementary thread geometry. The conicity has a conicity angle alpha of 0.3 to 5 degrees. The outer thread and the inner thread abut one another in a coupling end position in the thread portion in a gap and define a sealing plane. The outer thread and the inner thread have, in the thread portion in the coupling end position, an elastic deformation within the elastic limit of the piston rod and the piston. The elastic deformation is brought about by a surface pressure via a tightening torque. The piston rod and the piston are radially and axially fixed to one another without play in the coupling end position by the elastic deformation, and the elastic deformation is within the elastic limit both with and without an application of pressure by a pressure medium in the working cylinder.

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First Claim