HYDRAULIC DRIVE UNIT

• Main Authors: MIZUI HARUTSUGU, NODA FUMIO, MORI ETSUHIRO, GEN SOKO
• Format: Patent
• Language: English; Japanese
• Published: 08.10.2015
• Subjects: BLASTING; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR; FLUID-PRESSURE ACTUATORS; FLUID-PRESSURE ACTUATORS, e.g. SERVO-MOTORS; HEATING; HYDRAULICS OR PNEUMATICS IN GENERAL; LIGHTING; MECHANICAL ENGINEERING; SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; WEAPONS

PROBLEM TO BE SOLVED: To provide a hydraulic drive unit in which a position and a load of a hydraulic actuator can be precisely controlled with simple structure by utilizing a speed reduction ratio that is a substantial advantage of an air-hydro booster.SOLUTION: A hydraulic drive unit 1 comprises: an air-hydro converter 3 which converts pneumatic pressure to hydraulic pressure; a first flow rate control valve 7 which adjusts a flow of air from an air pressure source 2, and supplies it to the air-hydro converter 3; a second flow rate control valve 8 which adjusts a flow of a pressurized liquid from the air-hydro converter 3; an air-hydro booster 4 which converts the pneumatic pressure to boosted hydraulic pressure; a servo valve 9 which adjusts a flow rate of air from the air pressure source 2, and supplies it to the air-hydro booster 4; a hydraulic actuator 5; and control means 11 which controls the supply of the pressurized liquid to the hydraulic actuator 5. A pressure receiving area of the hydraulic actuator 5 is formed larger than a rod area of the air-hydro booster 4. 【課題】 エアハイドロブースターの本質的な利点である減速比を活かすことで、簡易な構造で液圧アクチュエータの位置や荷重を精密に制御することができる液圧駆動装置を提供する。【解決手段】 空気圧を液圧に変換するエアハイドロコンバーター３と、空気圧源２からの空気の流れを調整してエアハイドロコンバーター３へ供給する第１流量制御弁７と、エアハイドロコンバーター３からの圧液の流れを調整する第２流量制御弁８と、空気圧を増圧させた液圧に変換するエアハイドロブースター４と、空気圧源２からの空気の流量を調整してエアハイドロブースター４に供給するサーボ弁９と、液圧アクチュエータ５と、液圧アクチュエータ５への圧液の供給を制御する制御手段１１とを備え、液圧アクチュエータ５の受圧面積は、エアハイドロブースター４のロッド面積よりも大きく形成されている液圧駆動装置１。【選択図】図１