| 摘要 |
The invention relates to a switching element (1) for a valve gear of an internal combustion engine, preferably for shutting off valves. Said valve comprises an external part (2), in addition to an internal element (5) that can be axially displaced in the bore (3) of said external part, said external part (2) and internal element (5) having at least one respective recess (7, 8) that lie in alignment with and at an axial distance from one another in a relative position that is achieved by a lost motion spring (6). In one of the recesses, coupling means (9), which are used for coupling the internal element (5) to the external part (2) in said relative position and which can be displaced in the direction of the other recess, are allocated to one another. Two pistons (10) are provided as the coupling means (9), said pistons running in the recess (8) that is configured as a radial bore of the internal element (5) and lying diametrically opposite one another. The recess (7) of the external part (2) is configured as an annular groove (16) in the bore (3) of said part and sections of the underside (17) of the pistons (10), which faces away from the cams, have a flat transversal surface (14), originating from the radially external front face (13) of said underside and acting as a contact area for a facing annular surface (15) of the annular groove (16). The pistons (10) are guided in the internal element (5) by means of an anti-torsion mechanism (19). The invention provides a switching element (1) that comprises a simply constructed coupling mechanism, which creates negligible stress on the components.
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