DRIVE DEVICE OF CONSTRUCTION MACHINE

摘要

A drive device of a construction machine includes a pump passage connected to a hydraulic pump, first and second supply passages connected to the pump passage, first and second passages connected to the first supply passage, third and fourth passages connected to the second supply passage, a first valve connected to the first and third passages, a second valve connected to the second and fourth passages, a first bucket passage connecting the first passage to a cap-side space of the bucket cylinder through the first valve, a second bucket passage connecting the third passage to a rod-side space of the bucket cylinder through the first valve, a first arm passage connecting the second passage to a rod-side space of an arm cylinder through the second valve, and a second arm passage connecting the fourth passage to a cap-side space of the arm cylinder through the second valve.

主权项

1. A drive device of a construction machine including a working implement with a bucket and an arm, comprising:
a bucket cylinder which operates the bucket; an arm cylinder which operates the arm; a first hydraulic pump which discharges working fluid supplied to the bucket cylinder and the arm cylinder; and a hydraulic circuit through which the working fluid discharged from the first hydraulic pump flows, wherein the hydraulic circuit includes
a first pump passage which is connected to the first hydraulic pump,a first supply passage and a second supply passage which are connected to the first pump passage,a first branch passage and a second branch passage which are connected to the first supply passage,a third branch passage and a fourth branch passage which are connected to the second supply passage,a first main operation valve which is connected to the first branch passage and the third branch passage,a second main operation valve which is connected to the second branch passage and the fourth branch passage,a first bucket passage which connects the first branch passage to a cap-side space of the bucket cylinder through the first main operation valve,a second bucket passage which connects the third branch passage to a rod-side space of the bucket cylinder through the first main operation valve,a first arm passage which connects the second branch passage to a rod-side space of the arm cylinder through the second main operation valve, anda second arm passage which connects the fourth branch passage to a cap-side space of the arm cylinder through the second main operation valve.