| 摘要 |
<p>PURPOSE:To simultaneously perform maximum discharge amount regulating paired-off hydraulic pumps by shortening each positive control circuit by means of a short circuit pipe line in order to prevent a backflow, and providing a pressure regulator on the short circuit pipe line. CONSTITUTION:Positive control pipe lines 12a, 12b are shortened by a short circuit pipe line 18 on the way of which line check valves 19a, 19b are provided. A flowout pipe line 20 communicated with an oil tank is formed from the short circuit pipe passage 18, between the check valves 19a and 19b, while a relief valve 21 capable of adjusting pressure is arranged on the flowout pipe line 20. Maximum discharge amounts of hydraulic pumps 2a, 2b at the time of tilting levers 17a, 17b in a full-stroke are regulated accordingly, just by adjusting a set pressure of the relief valve 21, so that the maximum speed setting of hydraulic motors 4a, 4b are simultaneously performed.</p> |
