| 摘要 |
The invention proposes a variable valve train ( 1 ) for a gas exchange valve ( 8 ) of an internal combustion engine, which gas exchange valve ( 8 ) is actuated by a cam ( 2 ), said valve train ( 1 ) comprising a force transmission device ( 4 ) that is arranged between the cam ( 2 ) and the gas exchange valve ( 8 ) and includes a hydraulic lifting device ( 9 ) comprising a pressure piston ( 10 ) that is arranged for longitudinal displacement in a cylinder ( 12 ), said pressure piston ( 10 ) defining a pressure chamber ( 13 ) that is connected to a pressure medium supply of the internal combustion engine and said pressure piston ( 10 ) permitting, under high-pressure loading, an actuation of the gas exchange valve ( 8 ) independently of the cam ( 2 ). The force transmission device ( 4 ) is configured as an oscillating lever or rocker arm ( 3 ) mounted for pivoting on a lever shaft ( 6 ) comprising a longitudinal channel ( 14 ) that transports pressure medium and acts as a link ( 15 ) between the pressure medium supply and the pressure chamber ( 13 ).
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