METHOD FOR MANUFACTURING A PISTON ROD UNIT

摘要

In illustrative embodiments a method has been shown for manufacturing a piston rod unit. The piston rod unit includes a metallic tube shaped piston rod member defining a cavity therein and at least one terminal member having a fastening pin fastened within a respective end portion of the cavity. The fastening pin is provided with an outer diameter which is larger than the initial inner diameter of the piston rod member. This fastening pin is pressed into an end portion of the cavity so as to radially expand the piston rod member along at least a part of the end portion to an expanded outer diameter larger than the initial outer diameter of the tubular piston rod member. Hereupon the piston rod member is radially compressed by hammering within the area of the expanded outer diameter until the initial outer diameter is substantially reestablished.