| 摘要 |
A two-armed adjusting lever (S) is in constant contact with the running surfaces of two cams (N1, N2), differing in their lift and overall lift duration and transmits the cam lifting movements by way of a pickup (ASt) to the valve. Spring-loaded tappets (F) increase the contact pressure of the adjusting lever (S) on the cams (N1, N2). A rotation of the control shaft (Sw), the crank pin (Kz) of which slides in the guide groove (Fü) of the adjusting lever (S), displaces the axis of rotation (D) of the adjusting lever (S) and thereby adjusts the lever arm ratio between the lifting action points (H1, H2) of the two cams (N1, N2) and the axis of rotation (D). The share of the lift of each individual cam in the valve lift varies, resulting in a stepless variation of the maximum valve lift and the valve opening time. This allows the valve timing and valve timing cross-sections to be adjusted to the requirements of different engine speeds and loads in internal combustion engines. The primary concern is to improve the torque/speed curve in order to increase the economy and ecological safety of an engine. <IMAGE>
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