| 摘要 |
<p>PURPOSE:To make a car travelable by means of manual control even in time of trouble in an electric control system by connecting another system's power source electrically to a solenoid-operated directional control valve which selectively feeds each controlling cylinder of a clutch and a transmission with pressure oil. CONSTITUTION:At normal time, since a clutch manual control valve 24 opens a relief passage 17 between a clutch hydraulic control valve 5 and a solenoid pressure control valve 16, an interval between respective passages 18 and 19 is interconnected to each other, while each relief circuit of these passages and a pressure oil control valve 25 is closed. And, a selector valve 14 is selected by the solenoid pressure control valve 16 via a clutch hydraulic control valve 5 and pressure oil is fed to the side of, for example, a clutch engaging chamber 10 in a clutch control cylinder 8, thus a clutch is engaged. In this case, when trouble occurs in an electric control system, an emergency control transfer switch 40 is operated. And, a solenoid-operated directional control valve 4 is energized with current directly from a power source 41, whereby selective feed of the pressure oil is secured in this way.</p> |
