| 摘要 |
<p>An electric-hydraulic control for an automatic gear box (1) has two gear input shafts (11, 12). The first input shaft (11) is linked to the turbine (21) of a hydrodynamic unit (2) and the second shaft (12) is directly linked to the driving shaft (31) of a driving motor (3). The input power is transmitted depending of each gear separately or as separated input power to a reduced planetary coupling gear, for example with a selecting slide (4) at least for the neutral position (N) as well as for the forward (D) and backward motion (R). The control also has an electronic control apparatus (5), magnetic valves (6) held in the neutral position by springs, a hydraulic pressure source (7), pressure and switching valves and dampers for activating gear separating clutches and brakes (A-E). An emergency valve (8/9) is arranged between a magnetic valve (6) and the separating clutches for the highest gear (E) and the backward gear (B). This allows to continue driving in case of power failure by mechanical transmission via the clutch (E), both forward and backward, as well as starting in both these directions, via the backward gear clutch (B).</p> |
