JPH01154075U

JPH01154075U -

Info

Publication number: JPH01154075U
Application number: JP5190988U
Authority: JP
Priority date: 1988-04-18
Filing date: 1988-04-18
Publication date: 1989-10-24

Description

[Brief explanation of drawings]

図面は、本考案に係る作業用走行機体のパワー
ステアリング装置の実施例を示したものであつて
、第１図は農用トラクタの概略側面図、第２図は
同上要部正面図、第３図はフロントアクスル部の
平面図、第４図はパワーステアリング用油圧シリ
ンダの正面図、第５図はパワーステアリング機構
の油圧制御回路概略図、第６図は制御機構のブロ
ツク回路図、第７図は制御システムのフローチヤ
ート図、第８図Ａ、Ｂはエンジンの始動時、停止
時における第二切換えバルブの切換え状態を示す
作用説明図、第９図は横滑り補正手段においてス
リツプ率と修正操蛇角との関係を示すグラフ図で
ある。図中、１は走行機体、３，４は油圧ポンプ、６
，１０は油圧シリンダ、２１は切換えバルブ、２
２は制御部である。 The drawings show an embodiment of the power steering device for a working traveling vehicle according to the present invention, in which Fig. 1 is a schematic side view of an agricultural tractor, Fig. 2 is a front view of the same essential parts, and Fig. 3 is a schematic side view of an agricultural tractor. 4 is a front view of the power steering hydraulic cylinder, FIG. 5 is a schematic diagram of the hydraulic control circuit of the power steering mechanism, FIG. 6 is a block circuit diagram of the control mechanism, and FIG. 7 is a plan view of the front axle. Flowchart of the control system, Figures 8A and B are operation explanatory diagrams showing the switching state of the second switching valve when starting and stopping the engine, and Figure 9 is a diagram showing the slip ratio and correction steering angle in the sideslip correction means. FIG. In the figure, 1 is the traveling aircraft, 3 and 4 are hydraulic pumps, and 6
, 10 is a hydraulic cylinder, 21 is a switching valve, 2
2 is a control section.

Claims

[Scope of utility model registration request]

In a work traveling machine comprising a first hydraulic pump for operating an actuator such as lifting and lowering a working part, and a second hydraulic pump for power steering, an oil passage for operating the actuator from the first hydraulic pump and a second hydraulic pump for operating the actuator are provided. A switchable valve mechanism is provided between the power steering oil passage from the hydraulic pump and a switching valve mechanism that can be switched to supply pressure oil from the first hydraulic pump to the power steering oil passage. A power steering device for a work traveling aircraft, characterized in that the power steering device is connected to a control section that issues a switching command to open a switching valve mechanism based on detection that the supply of pressure oil from a pump is insufficient.