Hydraulic coupling with a dovetail seal featuring multiple radial sealing surfaces and an internal preload element.

Abstract

Receiving element (20) for coupling with a head piece (12) of a corresponding plug element (10) for guiding pressurized fluid, wherein the head piece (12) has an outer surface, wherein the receiving element (20) comprises the following: a body (21) defining a bore (32) into which the head piece (12) can be inserted at least partially, wherein the bore (32) defines a recess (60), wherein the recess (60) has a cylindrical side wall which is separated by first inclined shoulders (61, 62), wherein the first inclined shoulders (61, 62) are inclined towards each other at the bore (32) of the body (21); a tubular seal (50) which is arranged in the recess (60) of the body (21) and defines a through-hole (53) therein between its ends, wherein the tubular seal (50) has an outer surface (66) configured for positioning on the cylindrical side wall of the recess (60), wherein the through-hole (53) has an inner surface (65) configured for positioning on the outer surface of the head piece (12) to be inserted therein, wherein the outer surface (66) has a pair of outer sealing elements (58) arranged circumferentially around it, the outer sealing elements (58) being configured to seal with the cylindrical side wall of the recess (60), the ends having second inclined shoulders (51, 52) inclined towards each other at the through-bore (53) of the tubular seal (50), the second inclined shoulders (51, 52) being configured to position on the first inclined shoulders (61, 62) of the body (21); and a preloading element (70, 72) arranged circumferentially around the inner surface (65) of the tubular seal (50), wherein the preloading element (70, 72) is configured to preload a section of the outer surface (66) of the tubular seal (50) circumferentially to the cylindrical side wall of the recess (60), the section being located between the pair of outer sealing elements (58).

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