| 摘要 |
<p>Provided is a hydraulic circuit for a working vehicle which simplifies control and can inhibit the occurrence of engine stall without increasing manufacturing costs. The hydraulic circuit for a slewing working vehicle (1) equipped with a load sensing system is provided with a plurality of hydraulic units (40) each having a hydraulic pump (47), a plurality of hydraulic actuators for performing work, and a flow regulating means (50) for regulating the discharge rate of the hydraulic pump by adjusting the swash plate angle (R) of the hydraulic pump. The hydraulic circuit is also equipped with: a revolution speed detection means (81) for detecting the actual revolution speed (N) of an engine (9); and a control means for performing control, whereby a target revolution speed (Ns) is set for the engine from the accelerator opening degree (Sn) of the engine, and if the actual revolution speed (N) is lower than the target revolution speed (Ns), the flow regulating means is used to control the swash plate angle (R) of the hydraulic pumps in only the hydraulic units (40, 60) having a hydraulic pump with a swash plate angle smaller than the maximum swash plate angle so that the actual revolution speed (N) and the target revolution speed (Ns) match.</p> |
