HYDRAULIC PRESSURE CIRCUIT AND WORKING MACHINE

摘要

Provided is a hydraulic circuit capable of solving a problem without having to solve by switching circuits that leads to operability deterioration, the problem being that a speed of a hydraulic cylinder lowers when an accumulator pressure rises, and realizing efficient reuse of energy. The hydraulic circuit has: main pumps (12, 13) driven by an engine (11); a boom cylinder (7cl) including a piston (7cp) operating by hydraulic oil supplied from the main pumps (12, 13), one chamber (7ch) and the other chamber (7cr) respectively partitioned and formed by the piston (7cp); an accumulator (61) accumulating pressure of the hydraulic oil extruded from one chamber (7ch) of the boom cylinder (7cl); and an assist pump motor (15) suctioning the hydraulic oil from the accumulator (61) when pressure continues to be accumulated in the accumulator (61) and the accumulator pressure rises.