JPS5891001U

JPS5891001U - Agricultural tractor work equipment control valve

Info

Publication number: JPS5891001U
Application number: JP18752481U
Authority: JP
Inventors: 中里　英一
Original assignee: カヤバ工業株式会社
Priority date: 1981-12-16
Filing date: 1981-12-16
Publication date: 1983-06-20

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 drawings]

第１図は本考案の一実施態様に係るコントロール弁の中
立時の縦断正面図、第２図、第３図は同じく上げ作動時
及び下げ作動時の縦断正面図、第４図は本考案の他の実
施態様に係るコントロール弁の中立時の縦断正面図、第
５図、第６図は同じく上げ作動時及び下げ作動時の縦断
正面図、第７図は本考案の他の実施態様に係るコントロ
ール弁の中立時の縦断正面図である。２．７１・・・・・・アンロードバルブ、４．７７・・
・・・・下げ用メインバルブ、５・・・・・・上げ用パ
イロットバルブ、６・・・・・・下げ用パイロットバル
ブ、８，９°°。・・・ソレノイド、１６・・・・・・シリンダ、５２・
・・・・・スプリング、Ｐ・・・・・・ポンプ、Ｔ・・
・・・・タンク。FIG. 1 is a longitudinal sectional front view of a control valve according to an embodiment of the present invention in neutral state, FIGS. A vertical cross-sectional front view of a control valve in a neutral state according to another embodiment, FIGS. 5 and 6 are vertical cross-sectional front views when the control valve is in a raising operation and a lowering operation, and FIG. 7 is a vertical cross-sectional front view of a control valve according to another embodiment of the present invention. FIG. 3 is a longitudinal sectional front view of the control valve when it is in neutral. 2.71...Unload valve, 4.77...
... Main valve for lowering, 5 ... Pilot valve for raising, 6 ... Pilot valve for lowering, 8,9°°. ...Solenoid, 16...Cylinder, 52.
...Spring, P...Pump, T...
····tank.

Claims

[Scope of utility model registration request]

(1) In a control valve equipped with an unload valve that selectively opens and closes the pump to the tank or cylinder side, and a main lowering valve that selectively opens and closes the cylinder to the tank, one of the unload valves a lift pilot valve that selectively opens and closes the side to the pump or tank;
A work equipment control valve for an agricultural tractor, which is provided with a lowering pilot valve that opens and closes one side of a lowering main valve to a tank, and these pilot valves are switched and driven by a solenoid.

(2) Utility model registration claim 1 in which the raising pilot valve and lowering pilot valve are arranged in series
A work machine control valve for an agricultural tractor as described in 2.

(3) A working machine control valve for an agricultural tractor according to claim 1 or 2, wherein a common spring is interposed between the raising pilot valve and the lowering pilot valve.

(4) The working machine control valve for an agricultural tractor according to claim 1, wherein the lifting pilot valve is of a spool type.

(5) The working machine control valve for an agricultural tractor according to claim 1, wherein the lifting pilot valve is of a poppet type.

(6) The working machine control valve for an agricultural tractor according to claim 1, wherein the lowering pilot valve is of a poppet type.