JPS61102656U

JPS61102656U -

Info

Publication number: JPS61102656U
Application number: JP18942684U
Authority: JP
Priority date: 1984-12-12
Filing date: 1984-12-12
Publication date: 1986-06-30

Description

[Brief explanation of the drawing]

第１図は、本考案による油圧回路図、第２図は
、他実施例、第３、第４図は、同要部拡大断面図
、第５図は、本考案による油圧回路を有するバツ
クホーの全体側面図、第６図は、同要部拡大平面
図。Ａ：バツクホー、Ｈ：油圧アクチユエータ、Ｖ
：ダブルパイロツトオプレーテイツドチエツクバ
ルブ、１７：スイング油圧シリンダ、１８：油圧
方向制御弁、１９，２０：往復油路、２１，２２
：往復パイロツトオペレーテイツドチエツクバル
ブ。 Figure 1 is a hydraulic circuit diagram according to the present invention, Figure 2 is another embodiment, Figures 3 and 4 are enlarged sectional views of the same essential parts, and Figure 5 is a diagram of a backhoe having a hydraulic circuit according to the present invention. The overall side view, and FIG. 6 is an enlarged plan view of the same essential parts. A: Backhoe, H: Hydraulic actuator, V
: Double pilot operated check valve, 17: Swing hydraulic cylinder, 18: Hydraulic directional control valve, 19, 20: Reciprocating oil path, 21, 22
: Reciprocating pilot operated check valve.

Claims

[Scope of utility model registration request]

Hydraulic actuator H of backhoe A and hydraulic directional control valve 18 for controlling the actuator H
A reciprocating pilot operated check valve 21 is provided in each reciprocating oil passage 19, 20 between the reciprocating oil passages 19 and 20.
, 22 are interposed to prevent hydraulic oil from flowing out from the hydraulic actuator H when the hydraulic directional control valve 18 is in the neutral state. When the valve 18 is in flow, the oil pressure sent from the control valve 18 to either of the reciprocating oil passages 19, 20 activates the backflow prevention function of the check valve in the other oil passage, which serves as the return oil passage from the hydraulic actuator H. The hydraulic circuit of the backhoe is configured to be released.