Fig. 2.29. Chart of the mechanism of phases of gas distribution: 1 – torque; 2 – engine speed; 3 – it is not enough also the sredneoborotny engine; 4 – high-speed engine; 5 – the engine with the mechanism of change of phases of gas distribution

The mechanism of change of phases of gas distribution provides the optimum moment of opening and closing of valves according to operating conditions of the engine by continuous change of phases of a cam-shaft of the drive of inlet valves and a bent shaft (fig. 2.29).

Fig. 2.30. The chart of change of phases of gas distribution at various ranges of operation of the engine: 1 – loading; 2 – frequency of rotation of the engine; 3 – idling range; 4 – range of small loadings; 5 – range of average loadings; 6 – range of big loadings of small and average speeds; 7 – range of big loadings and high speeds; 8 – work at full loading