Support structure for drive unit

摘要

In a support structure by a pendulum mount system supporting a drive unit with two mounts (RH)(LH) disposed upwardly and laterally thereof and a lower part thereof with a torque supporting part (Rr), the invention is made to improve the riding comfort performance by suppressing vertical vibrations of the floor at 12 to 17 Hz. To that end, given vertical dynamic spring constants of the one mount (RH) and the other mount (LH) to be K1 and K2 and horizontally transverse distances from a gravity center (G) of the unit to centers of both mounts to be L1 and L2 respectively, the dynamic spring constant K2 of the other mount is set to satisfy equation (a) below, where the coefficient C is 1.3 or more, preferably a variable less than 1.9. The peak frequency of loss factor (Lf) vertically of the one mount (Rh) is set at about 15 Hz. 1 $\begin{array}{cc}\mathrm{K2}=C·\frac{\mathrm{L1}}{\mathrm{L2}}·\mathrm{K1}& \left(a\right)\end{array}$