JPH02120557U

JPH02120557U -

Info

Publication number: JPH02120557U
Application number: JP3013689U
Authority: JP
Priority date: 1989-03-16
Filing date: 1989-03-16
Publication date: 1990-09-28

Description

[Brief explanation of drawings]

第１図は本考案の第１の実施例を示す油圧回路
図、第２図は第２の実施例を示す排土板装置の部
分斜視図、第３図ないし第５図は従来技術を示し
、第３図はホイール式油圧シヨベルの全体図、第
４図はシヤーシの後部に設けたアウトリガ装置の
斜視図、第５図は油圧回路図である。１３……アウトリガ装置（車体安定保持機構）
、１５……アウトリガ、１６……アウトリガシリ
ンダ（シリンダ装置）、１７……油圧ポンプ、１
９……コントロールバルブ、２１，２２，２３，
２４……切換弁、２５……操作切換弁、２６Ａ，
２６Ｂ……管路、２７Ａ，２７Ｂ，２８Ａ，２８
Ｂ……分岐管路、２９……逆止弁装置、２９Ａ，
２９Ｂ……逆止弁、３１Ａ，３１Ｂ……絞り管路
、３２Ａ，３２Ｂ……絞り、４１……排土板装置
（車体安定保持機構）、４３……ブレード、４４
……ブレードシリンダ（シリンダ装置）、Ａ……
ロツド側油室、Ｂ……ボトム側油室。 Fig. 1 is a hydraulic circuit diagram showing a first embodiment of the present invention, Fig. 2 is a partial perspective view of a soil removal plate device showing a second embodiment, and Figs. 3 to 5 show the prior art. 3 is an overall view of the wheeled hydraulic excavator, FIG. 4 is a perspective view of an outrigger device provided at the rear of the chassis, and FIG. 5 is a hydraulic circuit diagram. 13... Outrigger device (vehicle body stability holding mechanism)
, 15... Outrigger, 16... Outrigger cylinder (cylinder device), 17... Hydraulic pump, 1
9...Control valve, 21, 22, 23,
24...Switching valve, 25...Operation switching valve, 26A,
26B...Pipe line, 27A, 27B, 28A, 28
B... Branch pipe line, 29... Check valve device, 29A,
29B... Check valve, 31A, 31B... Throttle pipe, 32A, 32B... Throttle, 41... Earth removal plate device (vehicle body stability holding mechanism), 43... Blade, 44
...Blade cylinder (cylinder device), A...
Rod side oil chamber, B...Bottom side oil chamber.

Claims

[Scope of utility model registration request]

A cylinder device that operates a vehicle body stability holding mechanism by supplying and discharging pressure oil to and from a rod side oil chamber and a bottom side oil chamber, and a pair of cylinder devices connected to the rod side oil chamber and the bottom side oil chamber of the cylinder device. An operation switching valve for a vehicle body stability holding mechanism that is connected in parallel to a hydraulic power source together with a pipe line and other actuator operation switching valves, and that switches the direction of pressure oil supplied to and discharged from the cylinder device via the respective pipe lines. and a pair of check valves located between the operation switching valve and the cylinder device and provided in the middle of each of the pipes, and the pressure in one of the pipes In a hydraulic circuit for a vehicle body stabilization mechanism, which includes a check valve device that opens another check valve using this pressure when one check valve opens, the operation switching switch is located in the middle of each of the pipes. A hydraulic circuit for a vehicle body stability holding mechanism, characterized in that a throttle conduit is provided between a valve and a check valve device and connected to a tank via a throttle.