JPS6314001U

JPS6314001U -

Info

Publication number: JPS6314001U
Application number: JP10671186U
Authority: JP
Priority date: 1986-07-14
Filing date: 1986-07-14
Publication date: 1988-01-29

Description

[Brief explanation of the drawing]

第１図は、本考案の旋回エネルギ再生回路、第
２図は第１図での可変油圧ポンプの制御特性図、
第３図は従来の旋回油圧回路を示す。２……可変油圧ポンプ、２ａ……可変油圧ポン
プの斜板制御装置、５……方向切換弁、７……油
圧モータ、８……旋回慣性体、１１……シヤトル
弁、１２……蓄圧用切換弁、１３……シーケンス
弁、１４……アキユームレータ、１５……供給用
切換弁。 Fig. 1 is a swing energy regeneration circuit of the present invention, Fig. 2 is a control characteristic diagram of the variable hydraulic pump in Fig. 1,
FIG. 3 shows a conventional swing hydraulic circuit. 2... Variable hydraulic pump, 2a... Variable hydraulic pump swash plate control device, 5... Directional switching valve, 7... Hydraulic motor, 8... Rotating inertia body, 11... Shuttle valve, 12... For pressure accumulation Switching valve, 13... Sequence valve, 14... Accumulator, 15... Supply switching valve.

Claims

[Scope of utility model registration request]

A swing inertia body drive hydraulic circuit comprising a variable hydraulic pump having a constant horsepower control function, a hydraulic motor for driving the swing inertia body, and a direction switching valve for controlling the rotation direction of the hydraulic motor,
A shuttle valve between the directional control valve and the hydraulic motor for high pressure selection, a pressure accumulation control valve that opens when the directional control valve is in neutral and guides pressure oil to the accumulator, and maintains brake pressure at a constant level during pressure accumulation. Sequence valve to store pressure oil, accumulator to store pressure oil,
Additionally, a supply switching valve is provided that opens when the directional switching valve is in a state other than neutral, and supplies pressure oil from the accumulator to the swing inertia drive hydraulic circuit, and maintains a constant braking pressure when the swing inertia moves. Pressure is accumulated in the accumulator while holding the rotating inertial body, and pressure oil is supplied from the accumulator to the drive hydraulic circuit when the rotating inertial body is driven. If the pressure is set to the minimum pressure and the pressure oil is supplied by the accumulator only in the constant horsepower control range of the variable hydraulic pump, and the pressure oil is not supplied by the accumulator, the output horsepower of the variable hydraulic pump is the conventional horsepower, A swing energy regeneration circuit for a swing excavator, characterized in that, when pressure oil is supplied by an accumulator, the output horsepower of a variable hydraulic pump is controlled to be reduced by the average output horsepower of the accumulator.