Functional element for the fluid-tight attachment to a sheet metal part, component assembly and method

摘要

A functional element having a head part with a flange and a section projecting away from a first side of the flange which is punching into a sheet metal part without piercing the sheet metal part and also having a shaft part with a longitudinal axis which satisfies a function and which projects away from the side from the flange opposite to the first side. The flange and the section are arranged at least substantially coaxial to the shaft part, with the section, which is formed as a hollow cylinder having ribs extending parallel to the longitudinal direction at its outer jacket surface. At the inner side the section has a diverging truncated cone shape which substantially runs out at the free end, with the truncated cone shape serving for the dilation of the section during punching into the sheet metal part. A component assembly and a method of manufacturing it are also claimed.

主权项

1. A functional element (10) having a head part with a flange having first and second sides (14, 18) and a hollow section (16) projecting away from the first side (14) of the flange (12) for piercing-free insertion into a sheet metal part (72) and also having a shaft part (20) with a longitudinal axis (22) which satisfies a function and which projects away from the second side (18) of the flange (12) opposite to the first side (14), wherein the flange (12) and the section (16) are arranged at least substantially coaxial to the shaft part (20), the section (16), being formed as a hollow cylinder having an inner side, a free end face (28), an outer jacket surface and ribs (26) extending parallel to the longitudinal direction at its outer jacket surface and the section (16) further having a diverging truncated cone shape (34) in the region (32) of its free end face (28) at the inner side, wherein the said hollow section (16) includes a cylindrical portion (44) adjacent to the free end (28) of the hollow section (16) and a portion (46) which tapers in the direction towards the cylindrical portion (44) and which is arranged between the flange (12) and the cylindrical portion (44), wherein the said ribs (26) have a reducing radial thickness at the tapering portion (46) in the direction towards the flange (12).