JPS6411379U

JPS6411379U -

Info

Publication number: JPS6411379U
Application number: JP10653487U
Authority: JP
Priority date: 1987-07-11
Filing date: 1987-07-11
Publication date: 1989-01-20

Description

[Brief explanation of drawings]

第１図と第２図は、本考案の一実施例を示す制
御機構の断面図であつて、第１図はそのシリンダ
に作動圧を下回る液圧が導入されている状態を示
し、第２図は同シリンダに作動圧を上回る液圧が
導入されている状態を示している。第３図は本考
案に係るウオーム・ラツク機構の噛合関係を示す
平面図である。第４図は本考案を適用する可変ポ
ンプを組込んだ液圧回路の一例を示す回路図であ
る。１……ケースボデイ、２，２ａ，２ｂ……スプ
ール穴、３……メインスプール、４……可変スプ
ール、５……嵌合孔、６……操作軸、７……容量
可変軸、８……シリンダ、９……液圧導入通路、
１０……スプリング、１１……容量操作杆、１２
……ラツク、１３……ウオームギヤ、ＰＥ……可
変ポンプ、ＣＭ……制御機構、Ｉ……駆動源。 1 and 2 are cross-sectional views of a control mechanism showing an embodiment of the present invention, in which FIG. 1 shows a state in which a hydraulic pressure lower than the operating pressure is introduced into the cylinder, and FIG. The figure shows a state in which hydraulic pressure exceeding the operating pressure is introduced into the cylinder. FIG. 3 is a plan view showing the meshing relationship of the worm-rack mechanism according to the present invention. FIG. 4 is a circuit diagram showing an example of a hydraulic circuit incorporating a variable pump to which the present invention is applied. 1... Case body, 2, 2a, 2b... Spool hole, 3... Main spool, 4... Variable spool, 5... Fitting hole, 6... Operating shaft, 7... Variable capacity shaft, 8... ...Cylinder, 9...Hydraulic pressure introduction passage,
10...Spring, 11...Capacity operating rod, 12
...Rack, 13... Worm gear, PE... Variable pump, CM... Control mechanism, I... Drive source.

Claims

[Scope of utility model registration request]

A hollow main spool with an operating shaft connected to one end and slidably fitted into the spool hole of the case body, and a variable capacity shaft of a variable pump connected to the opposite side of the operating shaft to form the main spool. a variable spool that is slidably fitted to the main spool, and a variable spool that is formed between the variable spool and the main spool inside the main spool, and presses the variable spool toward the operating shaft by introducing pressure on the high pressure side of the variable pump. and a spring inserted on the opposite side of the cylinder to urge the variable spool toward the variable capacity shaft. A rack is provided on the operating shaft, and a rack is provided on the operating shaft, and a rack is provided on the operating shaft. The worm gear is engaged so that the operating shaft is moved in the axial direction by the rotational movement of the capacity operating rod, and the spring is connected to the cylinder so that a pressure near the bottom of the relief setting pressure in the hydraulic pressure circuit of the variable pump is applied. A control mechanism for a variable pump, characterized in that the spring force is set to compete with the cylinder fluid pressure when the pump is introduced.