| 摘要 |
A switching element ( 1 ) for a valve drive of an internal combustion engine is provided, preferably for deactivating a valve. The switching element has an outer section ( 2 ), in addition to an inner element ( 4 ) that can be axially displaced in a bore ( 3 ) of the outer section. The outer section ( 2 ) and the inner element ( 4 ) are displaced away from one another by action of lost-motion spring elements ( 5 ) and can be coupled together in an axially-distant relative position, whereby at least one piston ( 6 ), which is situated in a bore ( 7 ) that runs transversally through the inner element ( 4 ), acts as a coupling element. An annular groove ( 8 ), into which the piston ( 6 ) can be partially displaced to adopt its coupling position, is located in the bore ( 3 ) of the outer section ( 2 ). At least some sections of an underside ( 9 ) of the piston ( 6 ) have a flat transversal surface ( 11 ), which leads from a outer radial end face ( 10 ) of the piston and acts as a contact zone for an opposing annular surface ( 12 ) of the annular groove ( 8 ), and the piston is held in the inner element ( 4 ) by a rotational lock ( 13 ). Stop elements ( 15 ) are allocated to an inner radial end face ( 14 ) of the piston ( 6 ) for an uncoupling position of the piston, and the rotational lock ( 13 ) and the stop elements ( 15 ) are formed from one component.
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