| 摘要 |
<p>PURPOSE:To make a clutch independently function through one hydraulic circuit to accurately control the clutch by providing a hydraulic circuit between a directional control valve to change over a pressure oil to both a power take off working valve and a travel working valve and a flow dividing valve with a pressure guaranteeing valve and a pressure control valve for oil pressure during the operation of one of the clutches. CONSTITUTION:A pressure oil is supplied through a flow dividing valve 2 from a hydraulic pump 1 to a pressure guaranteeing valve 3 and a directional control valve 5. The valve 3 keeps the pressure in a circuit 19 constant, and a pressure control valve 4 controls the pressure to that specified on a program or the like predetermined according to clutches 7, 9. The valve 5 changes over the circuits 18, 19 to a power take off guaranteeing position 21 where the circuits 18, 19 communicate with a travel working valve 8 and a power take off working valve 6 and a travel guaranteeing position 22 having a connection reverse to the above-mentioned one. The clutches 7, 9 can therefore be independently operated through only one hydraulic circuit to simply execute the accurate control of the clutches and the formation of the hydraulic circuit.</p> |
