JPS63121882U

JPS63121882U -

Info

Publication number: JPS63121882U
Application number: JP1389687U
Authority: JP
Priority date: 1987-02-02
Filing date: 1987-02-02
Publication date: 1988-08-08

Description

[Brief explanation of the drawing]

第１図はトラクタの概略側面図、第２図は作業
機の支持機構部の概略斜視図、第３図は油圧制御
ユニツト部の平面図、第４図は油圧制御の回路構
成図、第５図は絞り弁を構成するスプール弁体の
端面図である。尚、図面中、１はトラクタ、２は作業機、５は
リフトアーム、６はリフトロツド、１０，２０は
油圧シリンダ、３１はタンク、３２はポンプ、３
３は分流弁、３６は逆止弁、３８は減圧弁、４０
，９０は弁体、５０は方向切換弁、３７，６１，
６５，７１，７５は絞り弁、３７０は絞り油通路
、３７１はスプール弁体、３７２は油溝、３７３
は突部、３７５は弁ケース、３７６は弁穴、３７
７は油室、６２，６６，７２，７６は開閉弁、８
０，１００はパイロツト弁、１１０，１２０は作
動油路、１３０は制御油路、１５０は油圧制御ユ
ニツト、Ａ，Ｂ，Ｃは油作動装置である。 Fig. 1 is a schematic side view of the tractor, Fig. 2 is a schematic perspective view of the support mechanism of the working machine, Fig. 3 is a plan view of the hydraulic control unit, Fig. 4 is a circuit diagram of the hydraulic control, and Fig. 5 is a schematic side view of the tractor. The figure is an end view of a spool valve body that constitutes a throttle valve. In the drawings, 1 is a tractor, 2 is a working machine, 5 is a lift arm, 6 is a lift rod, 10 and 20 are hydraulic cylinders, 31 is a tank, 32 is a pump, 3
3 is a diversion valve, 36 is a check valve, 38 is a pressure reducing valve, 40
, 90 is a valve body, 50 is a directional control valve, 37, 61,
65, 71, 75 are throttle valves, 370 is a throttle oil passage, 371 is a spool valve body, 372 is an oil groove, 373
is a protrusion, 375 is a valve case, 376 is a valve hole, 37
7 is an oil chamber, 62, 66, 72, 76 are on-off valves, 8
0 and 100 are pilot valves, 110 and 120 are hydraulic oil passages, 130 is a control oil passage, 150 is a hydraulic control unit, and A, B, and C are oil-operated devices.

Claims

[Claims for Utility Model Registration] (1) In a throttle valve that is installed in a hydraulic circuit and controls the flow rate of oil, a spool valve body is incorporated in the oil passage, and the outer circumferential surface of the spool valve body and the oil passage A throttle valve characterized in that a throttle oil passage is provided by forming a clearance between the inner peripheral surface of the throttle valve and the inner peripheral surface of the throttle valve. (2) In claim 1 of the utility model registration claim, an axial oil groove is formed on the outer peripheral surface of the spool valve element, and the spool valve element is slidably built into a valve case having oil chambers at both ends. The upstream side and the downstream side of the oil passage are connected to both oil chambers of the valve case, respectively, and both end surfaces of the spool valve body are provided with grooves that can respectively come into contact with inner end surfaces of both oil chambers of the valve case. A throttle valve characterized by having a protrusion.