PROBLEM TO BE SOLVED: To change characteristics of pressure for switching a hydraulic switch valve according to a state of a traveling hydraulic device or a state of a prime mover.SOLUTION: A hydraulic system of a working machine is equipped with: a hydraulic pump which discharges hydraulic fluid; a hydraulic switch valve which can be switched to a plurality of switch positions according to the pressure of the hydraulic fluid; a proportional valve which can change the hydraulic fluid acted on the hydraulic switch valve; a traveling hydraulic device which can change speed according to the switch position of the hydraulic switch valve; and a control device which controls the proportional valve according to a state of the traveling hydraulic device. The hydraulic system of the working machine is equipped with: a prime mover; a hydraulic pump which is actuated by the power of the prime mover and discharges a hydraulic fluid; a hydraulic switch valve which can be switched to the plurality of switch positions according to the pressure of the hydraulic fluid; a proportional valve which can change the hydraulic fluid acted on the hydraulic switch valve; a traveling hydraulic device which can change speed according to the switch position of the hydraulic switch valve; and a control device which controls the proportional valve according to a state of the prime mover.SELECTED DRAWING: Figure 1
【課題】走行油圧装置の状態又は原動機の状態に応じて油圧切換弁の切換の圧力の特性を変更することができるようにする。【解決手段】作業機の油圧システムは、作動油を吐出する油圧ポンプと、作動油の圧力に応じて複数の切換位置に切換可能な油圧切換弁と、油圧切換弁に作用する作動油を変更可能な比例弁と、油圧切換弁の切換位置に応じて速度が変更可能な走行油圧装置と、走行油圧装置の状態に応じて比例弁を制御する制御装置と、を備えている。作業機の油圧システムは、原動機と、原動機の動力により作動し且つ、作動油を吐出する油圧ポンプと、作動油の圧力に応じて複数の切換位置に切換可能な油圧切換弁と、油圧切換弁に作用する作動油を変更可能な比例弁と、油圧切換弁の切換位置に応じて速度が変更可能な走行油圧装置と、原動機の状態に応じて比例弁を制御する制御装置と、を備えている。【選択図】図1
HYDRAULIC SYSTEM OF WORKING MACHINE
作業機の油圧システム
2017-10-05
Patent
Elektronische Ressource
Japanisch
IPC: | F16H Getriebe , GEARING / B60K Anordnung oder Einbau von Antriebseinheiten oder von Kraft- bzw. Drehmomentübertragungen in Fahrzeugen , ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES / E02F Baggern , DREDGING / F15B SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL , Druckmittelbetriebene Systeme allgemein |