JPS6354868U

JPS6354868U -

Info

Publication number: JPS6354868U
Application number: JP14930886U
Authority: JP
Priority date: 1986-09-29
Filing date: 1986-09-29
Publication date: 1988-04-13

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例を示す可変容量形液
圧ポンプの縦断面図、第２図は第１図の線―
に沿つた拡大断面図、第３図は第２図の線―
に沿つた断面図、第４図は従来例を示す断面図で
ある。１６…端蓋（弁本体）、２２…斜板（吐出量変
更部材）、２５…操作ピストン、２７…作用室、
３０…弁孔、３１…ばね孔、３２…供給路、３３
…出力路、３４…排出路、３５…弁体、３６…切
換ランド、３８…第１案内ランド、４０…第２案
内ランド、４１…ばね受け、４３…調圧ばね。 Fig. 1 is a vertical sectional view of a variable displacement hydraulic pump showing an embodiment of the present invention, and Fig. 2 is a line taken along the line of Fig. 1.
Figure 3 is an enlarged cross-sectional view along the line of Figure 2.
FIG. 4 is a sectional view showing a conventional example. 16... End cover (valve body), 22... Swash plate (discharge rate changing member), 25... Operation piston, 27... Action chamber,
30... Valve hole, 31... Spring hole, 32... Supply path, 33
...Output path, 34...Discharge path, 35...Valve body, 36...Switching land, 38...First guide land, 40...Second guide land, 41...Spring receiver, 43...Pressure regulating spring.

Claims

[Scope of utility model registration request]

An operation piston that operates a discharge amount changing member to reduce the pump discharge amount by supplying pressurized liquid to an action chamber formed on the back side, and a pressure control valve that supplies pressurized liquid to the action chamber of the operation piston. The pressure control valve is provided with a valve hole and a spring hole that are connected to each other in the valve body, and the valve hole has a supply path that communicates with the pump discharge path and supplies pressurized liquid, and an output path that communicates with the action chamber of the operating piston. In addition, a discharge passage communicating with the low pressure side is provided with an interval in the axial direction, and a switching land is provided in the intermediate portion that can freely slide onto the inner surface of the valve hole, and a first small diameter portion is connected to one end of the switching land. A valve body having a first guide land that is slidable to the inner surface of the valve hole through the second small diameter portion and a second guide land that is slidable to the other end of the switching land and to the inner surface of the valve hole through the second small diameter portion is moved in the axial direction. The spring hole is provided with a spring receiver that contacts one end of the valve element, and a pressure regulating spring that presses the valve element via the spring receiver. The variable valve is provided so that the output path is communicated with the supply path or the discharge path by moving due to the opposing action of the acting force of Positive displacement hydraulic pump.