| 摘要 |
The invention describes a device for the phase and lifting variation of the valves in an internal combustion engine (10) of the type comprising at least one valve control camshaft, made up of a first element (12), operationally connected to at least a first cam (14), and of a second element (20), operationally connected to at least a second cam (16). The first element (12) and second element (20) of the camshaft are operationally connected to each other. The device comprises at least one hydraulic piston (28), integral with the first element (12) of the camshaft, at an end thereof, actuated in the axial direction of the camshaft by the oil pressure of the engine (10) and provided with one or more helicoidal grooves (32), to realise the phase and/or lifting variation of at least one of the cams (14, 16) through the axial sliding of the first element (12) of the camshaft in relation to the second element (20) of the camshaft.
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