| 摘要 |
The releasable plug coupling is used for connecting fluid lines, particularly, fuel lines of motor vehicles. The plug coupling comprises a tubular plug-in part (3) with an annular retaining lip (4) as well as a coupling housing (1) with a cylindrical receiving space (2) for inserting the plug-in part (3) and a separate retaining element (7) with elastic retaining edges (11) that project radially into the receiving space (2) and that grip behind the retaining lip (4) after the plug-in part (3) is inserted into the receiving space (2). The retaining edges (11) are attached to support bodies (12) that are connected at their ends by elastic connecting pieces (14) that form a V to pressure plates (15). These plates extend outwards through corresponding openings (16) in the housing wall (17) and are pressed together from the outside for releasing the coupling. On the head part (6) of the coupling housing (1) there is a protective sleeve (18) that can move axially and that covers the pressure plates (15) when the plug-in part (3) is inserted in order to prevent unintentional release of the coupling. This protective sleeve (18) is integrally connected by a radial connection ring (19) to an inner guidance sleeve (20) that, in turn, is connected at their free inner edge (21) by two opposing connecting pieces (22) to a ring (23). This has the effect that the retaining lip (4) pushes against the ring (23) when the plug-in part (3) is inserted and thus, the protective sleeve (18) is automatically moved by the retaining ring (4) over the pressure plate (15). Between the connection ring (19) and the front wall (25) of the housing head (6), there is a spiral spring (24) that keeps the protective sleeve (18) ready for movement.
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