Patent ID: 9702488
Date: 2017-07-11
CPC Classifications: B60T,F02M,F16L

Claim:
1. A screw connection device for fluid lines, extending along a longitudinal axis (L) having a coupling nut with an internal wall having a thread thereon, said screw connection device having a connecting element with a mating external thread thereon, wherein the coupling nut is accommodated on a line end of a fluid line and, wherein the line end includes an end shape at a front end thereof, comprising a line flange, including a back end, wherein the line flange is a flaring of the fluid line, wherein, a conical locating surface of the coupling nut is disposed in the interior space of the coupling nut and is movable toward the back end of said line flange of said fluid line, and wherein a spring element is disposed on said fluid line between the conical locating surface of said coupling nut and the back end of said line flange, wherein the spring element is a single piece and comprises a stop section and a connecting section following each other in an axial direction, said stop section having a locating surface contacting said back end of said line flange and a locating surface contacting said conical locating surface of said coupling nut, said stop section being compressed between said back end of said line flange and said conical locating surface of said coupling nut, wherein both locating surfaces of the stop section are shaped conically, wherein the connecting section has an inner cylindrical surface and an outer cylindrical surface, wherein the spring element comprises a first end that belongs to the stop section and a second outermost axial end that belongs to the connecting section and wherein the second outermost axial end is substantially perpendicular with the inner and outer cylindrical surfaces of the connecting section, wherein the second outermost axial end of the spring element is completely contained within and directly abuts the coupling nut in an axial direction in a screwed-together state.