The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 12, 2007
Filed:
Aug. 18, 2005
Ralf Wilhelm, Oberreichenbach, DE;
Wolfgang Breun, Niederwerrn, DE;
Klaus Sauer, Röthlein, DE;
Ludwig Eberlein, Sulzthal, DE;
Ralf Wilhelm, Oberreichenbach, DE;
Wolfgang Breun, Niederwerrn, DE;
Klaus Sauer, Röthlein, DE;
Ludwig Eberlein, Sulzthal, DE;
ZF Friedrichshafen AG, Friedrichshafen, DE;
Abstract
A piston rod has a hollow section with an open end, a housing, and a fastening connection for a piston. The housing includes a cap welded to the open end, a tubular intermediate piece welded to the cap, and a bottom part attached to the fastening connection. The cap has a shoulder received in the intermediate piece to form an annular space which functions as a labyrinth seal to receive any weld spatters formed during the friction welding process. The outside surface of the piston rod is machined to final dimensions and surface coated following welding.