Connecting element for two machine parts or structural parts,for example extensible fit screw

Abstract

Abstract 1. Connecting element for two machine parts or structural parts for example extensible-fit screw with a fastening thread (13) and with a barrel (10) having a screw head (11), which has an extension barrel with a number of rings (120) between the screw head (11) and the fastening thread (13), whereby a groove (121) is arranged respectively between two rings and in the transition area of which from the screw head (11) to the ring section (120) a fillet (14) with a curvature (15) is provided, the diameter of which corresponds approximately to the diameter of the pitch dimension of the rings (120) and the bending radius of which is approximately 0.1 to 0.15 as large as the outer diameter, whereby the width of the crest (120b) of the rings (120) approximately corresponds to the width of the pitch of the preform of the rings (120) in order to achieve an appropriate dimension of the contact surface free of play between the extensible-fitscrew and the extensible-fit bore hole in the machine parts or structural parts, and the groove root (120a) is defined by a radius which is two to three times as large as the core radius of the fastening thread (13), characterized in that the rings (120) are arranged as parallel concentric extensible-fit rings, the outer diameter of which is by 0.1 to 0.5 mm larger according to the formula drings < d1 than the outer diameter of the fastening thread (13) and which have a stress cross-section in the groove root (120a) of the extensible-fit grooves (121) respectively between two concentric extensible-fit rings (120) (Aconc.rings ) which corresponds to the stress cross-section (AS ) (13a) of the fastening thread (13) according to the formula AS = Aconc.rings , whereby the groove root (120a) can have two radii, which are two to three times as large as the core radius of the fastening thread (13).

Inventors

• 👤 Hubert Dipl.-Ing. Taubert

Bibliographic Details