JPH0217008U - - Google Patents
Info
- Publication number
- JPH0217008U JPH0217008U JP9633588U JP9633588U JPH0217008U JP H0217008 U JPH0217008 U JP H0217008U JP 9633588 U JP9633588 U JP 9633588U JP 9633588 U JP9633588 U JP 9633588U JP H0217008 U JPH0217008 U JP H0217008U
- Authority
- JP
- Japan
- Prior art keywords
- valve
- spool
- switching valve
- unloading
- directional
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000010586 diagram Methods 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 1
Landscapes
- Lifting Devices For Agricultural Implements (AREA)
- Servomotors (AREA)
- Fluid-Pressure Circuits (AREA)
Description
第１図は本考案による農用トラクタ類の油圧制
御弁の一実施例を示す回路図、第２図は方向切換
弁とアンロード弁と補助弁の取り合い中立状態で
示す断面図、第３図は本考案の弁の分解斜視図、
第４図ａ〜ｄは本考案による油圧制御弁の動作を
示す断面図である。
１…ポンプ、２…アクチユエータ、４…筒状ス
プール、７…スプール、８…軸状ストツパ、８ａ
…通路、１１ａ…負荷圧室、１１ｂ…ポンプ圧室
、１４…弁体、１５…スプリングシート、４３…
絞り、Ａ…方向切換弁、Ｂ…アンロード弁、Ｂ′
…補助弁。
Fig. 1 is a circuit diagram showing an embodiment of the hydraulic control valve for agricultural tractors according to the present invention, Fig. 2 is a sectional view showing the directional control valve, unload valve, and auxiliary valve in a neutral state, and Fig. 3 is a circuit diagram showing an embodiment of the hydraulic control valve for agricultural tractors according to the present invention. An exploded perspective view of the valve of the present invention,
4a to 4d are cross-sectional views showing the operation of the hydraulic control valve according to the present invention. DESCRIPTION OF SYMBOLS 1... Pump, 2... Actuator, 4... Cylindrical spool, 7... Spool, 8... Axial stopper, 8a
... Passage, 11a... Load pressure chamber, 11b... Pump pressure chamber, 14... Valve body, 15... Spring seat, 43...
Throttle, A... Directional switching valve, B... Unload valve, B'
...Auxiliary valve.
Claims (1)
クチユエータに供給する方向切換弁と、方向切換
弁に内蔵されポンプ圧とアクチユエータからの負
荷圧とで作動するアンロード弁を備え、かつ前記
方向切換弁のスプールのランド部に流量調整用の
切欠きを備えた形式のものにおいて、前記方向切
換弁のスプール内にアンロード弁のスプールと対
峙する関係で軸状ストツパを固定し、この軸状ス
トツパに、負荷圧室と切換弁後端の低圧室を結ぶ
通路を設けると共に、該通路内に、これを常態に
おいて閉じアンロード時にのみ開放する補助弁を
配したことを特徴とするトラクタの油圧制御弁。 A directional switching valve that supplies oil discharged from a hydraulic pump to an actuator that drives a working machine, and an unloading valve built in the directional switching valve and operated by pump pressure and load pressure from the actuator, and the directional switching valve In the type having a notch for adjusting the flow rate in the land portion of the spool, a shaft-shaped stopper is fixed in the spool of the directional control valve in a relationship facing the spool of the unloading valve, and A hydraulic control valve for a tractor, characterized in that a passage connecting a load pressure chamber and a low pressure chamber at the rear end of the switching valve is provided, and an auxiliary valve is disposed in the passage, which is closed in normal conditions and opened only when unloading. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9633588U JPH0217008U (en) | 1988-07-22 | 1988-07-22 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9633588U JPH0217008U (en) | 1988-07-22 | 1988-07-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0217008U true JPH0217008U (en) | 1990-02-02 |
Family
ID=31321215
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9633588U Pending JPH0217008U (en) | 1988-07-22 | 1988-07-22 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0217008U (en) |
-
1988
- 1988-07-22 JP JP9633588U patent/JPH0217008U/ja active Pending