JPS6216805U

JPS6216805U -

Info

Publication number: JPS6216805U
Application number: JP317986U
Authority: JP
Priority date: 1985-01-22
Filing date: 1986-01-13
Publication date: 1987-01-31
Also published as: JPH0419209Y2

Description

[Brief explanation of the drawing]

第１図はこの考案の第１の実施例を装備した自
走式作業車における油圧回路を示す回路図、第２
図は同自走式作業車の概略側面図、第３図は上記
実施例を内装するバルブケースの正面図、第４図
は同バルブケースの背面図、第５図は同バルブケ
ースの縦断正面図、第６図は第５図の―線に
沿う断面図、第７図は第６図の―線に沿う断
面図、第８図は第５図の―線に沿う断面図、
第９図は第１の実施例の作用を説明するための模
式的なグラフ、第１０図はこの考案の第２の実施
例を装備した自走式作業車における油圧回路を示
す回路図、第１１図は第２の実施例の作用を示す
ための模式的なグラフ、第１２図ａ，ｂはそれぞ
れ、本考案が解決しようとした問題点の一つを説
明するための模式的断面図である。１……パワーステアリング機構、２……油圧リ
フト装置、３……油圧ポンプ、４……吐出回路、
５……流量一定形流量調整弁、６……調整流回路
、７……パワーシリンダ、８……余剰流回路、９
……リフトシリンダ、１０……定比分流弁、１０
ａ，１０ｂ……オリフイス、１１，１２……分流
回路、１３……絞り、１４……リリーフ弁、１５
……エンジン、２８……方向切換弁、４３……油
圧ユニツト、４４……方向切換弁、５１……バル
ブケース、５３Ｐ……ポンプポート、５３Ｃａ…
…調整流出力ポート、５３Ｃｂ……余剰流出力ポ
ート、５３Ｔ……タンクポート、６７……弁ばね
、６９，７０……弁ばね。 Figure 1 is a circuit diagram showing a hydraulic circuit in a self-propelled work vehicle equipped with the first embodiment of this invention;
The figure is a schematic side view of the self-propelled work vehicle, Figure 3 is a front view of the valve case housing the above embodiment, Figure 4 is a rear view of the valve case, and Figure 5 is a longitudinal front view of the valve case. Figure 6 is a cross-sectional view taken along line - in Figure 5, Figure 7 is a cross-sectional view taken along line - in Figure 6, and Figure 8 is a cross-sectional view taken along line - in Figure 5.
FIG. 9 is a schematic graph for explaining the operation of the first embodiment, FIG. 10 is a circuit diagram showing a hydraulic circuit in a self-propelled work vehicle equipped with the second embodiment of this invention, and FIG. Figure 11 is a schematic graph to show the action of the second embodiment, and Figures 12a and 12b are schematic cross-sectional views to explain one of the problems that the present invention attempts to solve. be. 1...Power steering mechanism, 2...Hydraulic lift device, 3...Hydraulic pump, 4...Discharge circuit,
5... Constant flow rate flow regulating valve, 6... Adjustment flow circuit, 7... Power cylinder, 8... Surplus flow circuit, 9
... Lift cylinder, 10 ... Constant ratio flow dividing valve, 10
a, 10b... Orifice, 11, 12... Shunt circuit, 13... Throttle, 14... Relief valve, 15
...Engine, 28... Directional switching valve, 43... Hydraulic unit, 44... Directional switching valve, 51... Valve case, 53P... Pump port, 53Ca...
...adjusted flow output port, 53Cb...excess flow output port, 53T...tank port, 67...valve spring, 69,70...valve spring.

Claims

[Scope of utility model registration request]

Power steering mechanism 1 and hydraulic lift device 2
In a self-propelled work vehicle equipped with a single hydraulic pump 3, a constant flow rate regulating valve 5 is connected to the discharge circuit 4 of the single hydraulic pump 3, and a regulating flow circuit 6 of the flow regulating valve 5 is provided.
The power cylinder 7 of the power steering mechanism 1
The hydraulic pressure supply device is configured such that the surplus flow circuit 8 of the flow rate adjustment valve 5 is configured as a hydraulic pressure supply circuit for the lift cylinder 9 of the hydraulic lift device 2, and the surplus flow circuit 8 of the flow rate adjustment valve 5 is configured as a hydraulic pressure supply circuit for the lift cylinder 9 of the hydraulic lift device 2. A constant ratio flow dividing valve 10 that divides the regulated flow or the discharge flow of the hydraulic pump 3 into two flows having a constant ratio of flow rates.
is inserted into the regulating flow circuit 6 or the discharge circuit 4, and oil is supplied to the power cylinder 7 or the flow rate regulating valve 5 through one branching circuit 11 of the constant ratio branching valve 10. A hydraulic supply device characterized in that the other branch circuit 12 of the constant ratio branch valve 10 is connected to the lift cylinder 9 together with the surplus flow circuit 8.