Excavator pivot apparatus provided with pivot thrust prevention device

• Main Author: SHIN KYUNGUL
• Format: Patent
• Language: English
• Published: 28.01.2015
• Subjects: DREDGING; FIXED CONSTRUCTIONS; FOUNDATIONS; HYDRAULIC ENGINEERING; SOIL SHIFTING

An excavator pivot apparatus provided with a pivot thrust prevention device includes: a brake fluid passage connected to the hydraulic chamber of a brake piston; a selection valve for connecting the brake fluid passage to a brake hydraulic port or a delay fluid passage; a spring compartment fluid passage with one end connected to a spring compartment of the brake piston and the other end connected to one point of the delay fluid passage; a check valve provided in the spring compartment fluid passage for supplying a hydraulic pressure from the delay fluid passage only toward the spring compartment; a spring compartment fluid bypass for connecting one point of the spring compartment fluid passage between the spring compartment and the check valve to another point of the spring compartment fluid passage between the check valve and the delay fluid passage; a thrust prevention valve provided in the spring compartment fluid bypass for closing or opening the spring compartment fluid bypass; a tilt sensor provided in one side of the excavator for sensing a tilt; and a thrust prevention valve control part for closing the thrust prevention valve when the excavator is positioned on slope ground, or opening the thrust prevention valve when the excavator is positioned on level ground, based on the tilt information of the tilt sensor.