JPH0439303U

JPH0439303U -

Info

Publication number: JPH0439303U
Application number: JP8083890U
Authority: JP
Priority date: 1990-07-30
Filing date: 1990-07-30
Publication date: 1992-04-03

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例を示す全体系統図、
第２図は第１図の各部の変位、圧力、ポンプ回転
数の変化を示す線図、第３図は第１図のポンプの
回転数と吐出量との関係を示す線図である。第４
図は公知の液圧制御回路を示す全体系統図、第５
図は第４図に使用されている慣用のアキシアルピ
ストンポンプを示す縦断面図、第６図は第４図に
おけるポンプの特性説明図である。１……タンク、２……液圧ポンプ、３……可変
速モーター、４……圧力検出器、５……方向制御
弁、６……アクチユエーター、７……負荷、８…
…変位計、９……位置設定器、１０……比較器、
１１……コントローラー、１２……圧力設定器、
１３……圧力比較器、１４……モーターコントロ
ーラー、１５……回転検出器。 FIG. 1 is an overall system diagram showing an embodiment of the present invention.
FIG. 2 is a diagram showing changes in displacement, pressure, and pump rotation speed of each part in FIG. 1, and FIG. 3 is a diagram showing the relationship between the rotation speed and discharge amount of the pump shown in FIG. 1. Fourth
The figure is an overall system diagram showing a known hydraulic control circuit.
The figure is a vertical cross-sectional view showing a conventional axial piston pump used in FIG. 4, and FIG. 6 is a characteristic explanatory diagram of the pump in FIG. 4. DESCRIPTION OF SYMBOLS 1...tank, 2...hydraulic pump, 3...variable speed motor, 4...pressure detector, 5...direction control valve, 6...actuator, 7...load, 8...
...Displacement meter, 9...Position setting device, 10...Comparator,
11... Controller, 12... Pressure setting device,
13...Pressure comparator, 14...Motor controller, 15...Rotation detector.

Claims

[Scope of utility model registration request]

The pump is equipped with a constant discharge hydraulic pump whose rotation speed is controlled via a motor controller based on the output of a comparator that compares the detected value of the circuit pressure detector and the set value of the circuit pressure setter, and is based on the output of the comparator. A hydraulic control circuit characterized in that the circuit pressure is maintained at a set value by controlling the discharge amount of the hydraulic pump.