| 摘要 |
<p>PURPOSE:To make a car travelable by means of manual control even at the time of trouble in an electric control system by connecting another system's power source to a solenoid-operated directional control valve which selectively feeds each controlling cylinder of a clutch and a transmission with pressure oil, with the operation of a lever. CONSTITUTION:At normal time, since a clutch manual control valve 24 opens a relief passage 17 between a clutch hydraulic control valve 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. In consequence, a selector switch 14 is selected, 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 a trouble occurs in an electric control system, an operating lever 43 is manually operated and an emergency control selector switch 40 and a shift control valve 42 are operated respectively. 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.</p> |
