JPS58156186U

JPS58156186U - Control device for variable displacement hydraulic pump

Info

Publication number: JPS58156186U
Application number: JP5364882U
Authority: JP
Inventors: 相川　徹男; 森井　隆夫
Original assignee: 油研工業株式会社
Priority date: 1982-04-15
Filing date: 1982-04-15
Publication date: 1983-10-18
Also published as: JPH0128314Y2

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

第１図は従来の制御装置を示す断面図、第２図は別の従
来例を示す油圧回路図、第３図はこの考案の一実施例を
示す模式構成図、第４図は前図の例の圧力−流量特性を
例示する線図、第５図はこの考案のもうひとつの実施例
を示す模式構成図、第６図はこの考案のさらに別の実施
例を示す模式構成図、第７図は前図の例の圧力−流量特
性を例示する線図である。２０：フンペンセータ弁、２１：可変容量形油圧ポンプ
、２６：オリフィス、２７：ポンプ吐出量制御要素、２
８ニスプール、２９：ピストン、３５：弁バネ、３６：
制御バネ、４０：制御バネ機構。 −圧力第５図Fig. 1 is a sectional view showing a conventional control device, Fig. 2 is a hydraulic circuit diagram showing another conventional example, Fig. 3 is a schematic configuration diagram showing an embodiment of this invention, and Fig. 4 is the same as the previous figure. FIG. 5 is a schematic diagram showing another embodiment of this invention; FIG. 6 is a schematic diagram showing yet another embodiment of this invention; FIG. The figure is a diagram illustrating the pressure-flow characteristics of the example shown in the previous figure. 20: Humpensator valve, 21: Variable displacement hydraulic pump, 26: Orifice, 27: Pump discharge amount control element, 2
8 varnish spool, 29: piston, 35: valve spring, 36:
Control spring, 40: control spring mechanism. -Pressure Figure 5

Claims

[Scope of utility model registration request]

By selectively guiding the discharge pressure of a variable displacement hydraulic pump to a discharge rate control element of the pump, the pressure vs. flow rate characteristics of the pump can be brought close to constant horsepower characteristics in which the discharge rate decreases as pressure increases. In the control device, there is an orifice disposed in a passage through which pressure oil discharged from the pump flows toward the load, and one end face receiving the spring force of a valve spring, and a differential pressure before and after the orifice between both end faces. a compensator valve which directs the pump discharge pressure to the control element according to the differential pressure by means of a spool adapted to act; and a compensator valve which presses the valve spring towards the spool via a piston and deflects the valve spring. A control device for a variable displacement hydraulic pump, comprising: a control spring mechanism that changes the pressure according to the load pressure.