Hydraulic Circuit for Construction Machine

Abstract

Task: A hydraulic circuit for a construction machine having good energy efficiency is provided. Means for Resolution: A hydraulic circuit includes a motor generator, a pump motor connected to the motor generator, a boom cylinder, a rod-side pipeline that connects the pump motor and a rod-side port of the boom cylinder, a cap-side pipeline that connects the pump motor and a cap-side port of the boom cylinder, an operating device that outputs a signal for operating the boom cylinder, and a controller that performs circuit control based on a signal output from the operating device. In a case where a rod push-out signal for the boom cylinder is output from the operating device, hydraulic oil flows from the rod-side pipeline to the cap-side pipeline via the pump motor. In a case where a rod retraction signal for the boom cylinder is output from the operating device, hydraulic oil flows from the cap-side pipeline to the rod-side pipeline via the pump motor.

Dependencies are inferred from the claim text.