JPH035769U

JPH035769U -

Info

Publication number: JPH035769U
Application number: JP6645889U
Authority: JP
Priority date: 1989-06-06
Filing date: 1989-06-06
Publication date: 1991-01-21
Anticipated expiration: 2004-06-06
Also published as: JPH089237Y2

Description

[Brief explanation of drawings]

第１図はこの考案にかかる切換弁をそなえた旋
回優先システムの油圧回路図、第２図、第３図は
それぞれこの考案にかかる切換弁の断面図、第４
図は従来技術切換弁をそなえた旋回優先システム
の油圧回路図である。１，２……リモコン弁、３……旋回モータ、４
……アームシリンダ、５……旋回切換弁、６，２
８……アーム切換弁、１０……メインポンプ、１
１……パイロツトポンプ、２４……ヘツド側油室
、２６……ロツド側油室、２９……第１チエツク
弁、３０……第２チエツク弁、３３……スプール
。 FIG. 1 is a hydraulic circuit diagram of a swing priority system equipped with a switching valve according to this invention, FIGS. 2 and 3 are sectional views of the switching valve according to this invention, and FIG.
The figure is a hydraulic circuit diagram of a swing priority system equipped with a conventional switching valve. 1, 2...Remote control valve, 3...Swivel motor, 4
...Arm cylinder, 5...Swivel switching valve, 6,2
8... Arm switching valve, 10... Main pump, 1
1... Pilot pump, 24... Head side oil chamber, 26... Rod side oil chamber, 29... First check valve, 30... Second check valve, 33... Spool.

Claims

[Scope of utility model registration request]

In an arm switching valve that operates various hydraulic actuators by operating a remote control valve, and exhibits a swing priority function during simultaneous swing and arm pull operations, a first check valve and a second check valve are installed on the spool inside the arm switching valve. A check valve is provided, and the pilot pressure derived from the swing remote control valve is applied to the first check valve during simultaneous swing and arm pull operations to stop the flow of return oil from the arm cylinder rod side oil chamber. A switching valve having a swing priority function, characterized in that a large amount of the return oil is regenerated and allowed to flow into the head side oil chamber for the arm cylinder.