Seven-ton class hydraulic excavator

• Main Authors: KIWAMU TAKAHASHI, YASUTAKA TSURUGA, KAZUHIKO MIZOGUCHI, HAJIME YOSHIDA, MAKOTO KUNO, TAKEO MANABE, NOZOMU TANAKA, TAKUYA MATSUI, YOSHIMI NAKAYAMA, KAZUSHIGE MORI
• Format: Patent
• Language: English
• Published: 01.08.2016
• Subjects: BLASTING; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR; DREDGING; FIXED CONSTRUCTIONS; FLUID-PRESSURE ACTUATORS; FLUID-PRESSURE ACTUATORS, e.g. SERVO-MOTORS; FOUNDATIONS; HEATING; HYDRAULIC ENGINEERING; HYDRAULICS OR PNEUMATICS IN GENERAL; LIGHTING; MECHANICAL ENGINEERING; SOIL SHIFTING; SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; WEAPONS

Output power of an engine 1 is set to be 36 kW, lower than current 40 to 55 kW output power. Consumption (absorption) horsepower of a hydraulic pump 2 is set to be substantially the same as current consumption horsepower of a hydraulic pump usually mounted on a seven-ton class hydraulic excavator based on related art. The conduits 4a, 4b, Sa, 5b extending from a control valve 3 to a boom cylinder 4 and an arm cylinder 5 are configured to have a size of 3/4 inch (1.91 cm) which is larger than a current hose size adopted in the related art. The conduits 7a, 7b extending to traveling motors 7, 8 are configured to have a size of 5/8 inch (1.59 cm) which is larger than a current hose size adopted in the related art. As a result, a hydraulic excavator that, despite its seven-ton class specifications, can be equipped with the engine free of structurally complex and expensive engine peripheral devices, and that maintains performance comparable to that of a conventional working machine is provided.