| 摘要 |
<p>PURPOSE:To reduce load during operation by a method in which in an oil- pressure structure having three oil pressure systems, a switching action-type distribution valve is provided by which working oil passing through one center bypass oil path among three control valves is distributed to the other oil pathes. CONSTITUTION:An oil-pressure structure for working vehicle consists of three oil-pressure pumps P1, P2, and P3 to be operated by single engine E, three oil pressure systems B1, B2, and B3 to supply working oil from the pumps P1, P2, and P3 to actuators, and three center bypass-type control valves A1, A2, and A3. A distribution valve mechanism 12 by which working oil passing through one center bypass oil path 9 of the valves A1, A2, and A3 is distributed to the two other oil paths is also provided. The valve 12 is switched to neutral and non-neutral positions according to loading and non-loading conditions of the oil paths.</p> |
