WORK VEHICLE HYDRAULIC DRIVE SYSTEM

摘要

[Problem] To provide a work vehicle hydraulic drive system that ensures good operability when hydraulic fluid that has been discharged from a hydraulic actuator is regenerated to drive another actuator. [Solution] This work vehicle hydraulic drive system is provided with: a regeneration passage (18) that connects a bottom-side oil chamber of a hydraulic cylinder (4) between a hydraulic pump (50) and a second hydraulic actuator (8); a regeneration flow rate adjustment means that supplies at least a portion of hydraulic fluid discharged from the bottom-side oil chamber between the hydraulic pump (50) and the second hydraulic actuator (8) via the regeneration passage (18); a differential pressure detection means or a differential pressure calculation means, which reads the pressure of the bottom-side oil chamber of the hydraulic cylinder, which is detected by a first pressure detection means (25), and the pressure between the hydraulic pump (50) and the second hydraulic actuator (8), which is detected by a second pressure detection means (26), and calculates the pressure differential; and a control device that controls the regeneration flow rate adjustment means so as to gradually increase the flow rate of hydraulic fluid circulating through the regeneration passage (18) in response to an increase in the differential pressure calculated by the differential pressure calculation means or the differential pressure detected by the differential pressure detection means.