JPS6455305U

JPS6455305U -

Info

Publication number: JPS6455305U
Application number: JP15032887U
Authority: JP
Priority date: 1987-09-30
Filing date: 1987-09-30
Publication date: 1989-04-05

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例を示す多段油圧回路
図、第２図は本考案の他の実施例を示すベントポ
ートを利用した多段油圧回路図、第３図はさらに
他の実施例を示すパイロツトコントロール型アク
チユエータを使用した多段油圧回路図、第４図は
さらに他の実施例を示す切換弁が１個の場合の多
段油圧回路図、第５図はさらに他の実施例を示し
、切換弁２個に対しアクチユエータ及び切換弁が
それぞれ３個の場合の多段油圧回路図、第６図は
本考案のさらに他の実施例を示し、アクチユエー
タ２個に対しリリーフ弁を３個使用した場合の多
段油圧回路図、第７図はさらに他の実施例を示す
多段油圧回路図、第８図は第７図に示す多段油圧
回路を利用したクローラ型建設機械のアクチユエ
ータ動作特性図、第９図は切換弁を電磁弁式にし
た多段油圧回路図、第１０図及び第１１図はそれ
ぞれ従来の多段油圧回路図である。１，１９……油圧源、２，３，１１，１２，１
８，２１，２２……リリーフ弁、８……タンク、
４，５，９，１０，１５，１６……切換弁、６，
７，１７……アクチユエータ、Ａ，Ｂ，Ｃ……ポ
イント。 Fig. 1 is a multi-stage hydraulic circuit diagram showing one embodiment of the present invention, Fig. 2 is a multi-stage hydraulic circuit diagram using vent ports showing another embodiment of the invention, and Fig. 3 is a diagram showing still another embodiment. FIG. 4 is a multi-stage hydraulic circuit diagram using a pilot-controlled actuator shown in FIG. Figure 6 is a multi-stage hydraulic circuit diagram in the case where three actuators and three switching valves are used for two valves, and shows still another embodiment of the present invention, in which three relief valves are used for two actuators. FIG. 7 is a multi-stage hydraulic circuit diagram showing another embodiment. FIG. 8 is an actuator operation characteristic diagram of a crawler type construction machine using the multi-stage hydraulic circuit shown in FIG. 7. A multi-stage hydraulic circuit diagram in which the switching valve is a solenoid valve type, and FIGS. 10 and 11 are respectively conventional multi-stage hydraulic circuit diagrams. 1, 19... Hydraulic source, 2, 3, 11, 12, 1
8, 21, 22...relief valve, 8...tank,
4, 5, 9, 10, 15, 16... switching valve, 6,
7, 17... Actuator, A, B, C... Point.

Claims

[Scope of utility model registration request]

A plurality of relief valves are connected in series to one hydraulic power source, the outlet side of the last relief valve is connected to a tank, the inlet side of each of the relief valves is connected to at least one switching valve, and the switching valve is connected to the tank. A plurality of actuators are connected to the valve, a combination is selected by the switching valve from a plurality of hydraulic pressures having different values at the inlets of the plurality of relief valves, and a zero hydraulic pressure closed by the switching valve, and a hydraulic pressure is applied to each of the actuators. A multi-stage hydraulic circuit characterized by applying .