JPS5937404U

JPS5937404U - Work equipment fluid pressure system

Info

Publication number: JPS5937404U
Application number: JP13434582U
Authority: JP
Inventors: 彰夫服部
Original assignee: 株式会社クボタ; クボタ精機株式会社
Priority date: 1982-09-03
Filing date: 1982-09-03
Publication date: 1984-03-09

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) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

第１図はコンバイン前部の側面図、第２図は刈取部昇降
制御系統図、第３図は油圧回路図、第４図はバルブ取付
は部の拡大断面図、第５図は第４図のＶ−Ｖ線断面図、
第６図はバルブの断面図、第７図は第６図の■−■線矢
視図親図８図イ９口。ハは刈取部の昇降中立時、上昇時、下降時におけるバル
ブ要部の拡大断面図である。６・・・・・・シリンダ、１１・・・・・・昇降操作レ
バー、１５・・・・・・スプール、１５ｅ・・・・・・
ランド、２７・・・・・・バルブケース、２８・・・・
・・流体圧アクチュエータ、２９・・・・・・チェック
弁、３０−−−−−−パイロット室ミ３１・・・・・・
パイロットピストン、３４・・・・・・絞り部、Ｐ□・
・・・・・シリンダポート、Ｐ２・・・・・・ポンプポ
ート、Ｐ３・・・・・・ドレンポート、Ｐ、・・・・・
・キャリオーバーポート。第４図第８図Figure 1 is a side view of the front part of the combine, Figure 2 is a diagram of the reaping section elevation control system, Figure 3 is a hydraulic circuit diagram, Figure 4 is an enlarged sectional view of the valve installation section, and Figure 5 is Figure 4. V-V line sectional view of
FIG. 6 is a sectional view of the valve, and FIG. 7 is a view taken along the line ■-■ in FIG. 6. C is an enlarged sectional view of the main part of the valve when the reaping section is in the neutral state, when it is raised and when it is lowered. 6... Cylinder, 11... Lifting operation lever, 15... Spool, 15e...
Land, 27...Valve case, 28...
...Fluid pressure actuator, 29...Check valve, 30---Pilot chamber 31...
Pilot piston, 34... Throttle section, P□・
... Cylinder port, P2 ... Pump port, P3 ... Drain port, P, ...
・Carryover port. Figure 4 Figure 8

Claims

[Claims for Utility Model Registration] ■ Port P1, pump port P2, and drain port P3 that communicate with the single-acting cylinder 6 for lifting and lowering the work equipment, and a carryover port that can supply pressure fluid to other fluid pressure actuators 28. Valve case 2 which forms P.
7, the cylinder port P1 can be freely opened and closed, and
The check valve 29 is biased in the closing direction by the back pressure on the cylinder 6 side, the pilot piston 31 presses and opens the check valve 29 due to the shift caused by the supply of pressure fluid into the pilot chamber io, and the lift operation lever 11. As a result of the shift associated with the operation, the pressure fluid from the pump boat P2 directly opens the check valve 29 and moves the cylinder 6 to the lifting side of the working device, and the pilot chamber 30 and the drain port P3. a second cylinder 6 that maintains the cylinder 6 inoperative by supplying pressurized fluid from the pump port P2 to the carryover port P;
supplying the pressure fluid from the pump boat P2 to the pilot chamber 30 and the carryover port P, and communicating the cylinder port P1 and the drain port P3 to operate the cylinder 6 to the lowering side of the working device. In a fluid pressure device for a working machine, the spool 15 is switchable between a third state and a third state.
A fluid pressure device for a working machine, characterized in that a constriction part 34 is provided which can reduce the amount of pressure fluid supplied to the actuator 28 only when the actuator is switched to the third state. (2) The throttle portion 34 is formed at a location corresponding to the pump port P2 of the spool 15, and the spool 15 is composed of an annular projection having a slightly smaller diameter than the land 15e of the spool 15. Fluid pressure device of the described working machine.