JPS61169166U - - Google Patents
Info
- Publication number
- JPS61169166U JPS61169166U JP5200085U JP5200085U JPS61169166U JP S61169166 U JPS61169166 U JP S61169166U JP 5200085 U JP5200085 U JP 5200085U JP 5200085 U JP5200085 U JP 5200085U JP S61169166 U JPS61169166 U JP S61169166U
- Authority
- JP
- Japan
- Prior art keywords
- bucket
- lift arm
- control
- valve
- lift
- 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 5
Landscapes
- Fluid-Pressure Circuits (AREA)
- Operation Control Of Excavators (AREA)
Description
第１図はこの考案の第１の実施例を示す油圧回
路図、第２図は同第１の実施例の要部の具体構造
例を示す断面図、第３図はこの考案の第２の実施
例を示す油圧回路図、第４図は従来例を示す機構
図及び油圧回路図である。
２……リフトアーム、３……バケツト、４……
リフトシリンダ、５……チルトシリンダ、９……
第１のコントロールバルブ、１０……第２のコン
トロールバルブ、１６……圧力補償弁、１７，１
８，１８Ａ，１８Ｂ……制御オリフイス、２１…
…定比分流弁、２２……出力ポート、２３……出
力ポート、Ｐ１，Ｐ２……ポンプポート、Ｔ１…
…タンクポート。
Fig. 1 is a hydraulic circuit diagram showing a first embodiment of this invention, Fig. 2 is a sectional view showing a specific structural example of the main part of the first embodiment, and Fig. 3 is a hydraulic circuit diagram showing a concrete structure of the main part of the first embodiment. A hydraulic circuit diagram showing an embodiment, and FIG. 4 is a mechanism diagram and a hydraulic circuit diagram showing a conventional example. 2...Lift arm, 3...Bucket, 4...
Lift cylinder, 5...Tilt cylinder, 9...
First control valve, 10...Second control valve, 16...Pressure compensation valve, 17,1
8, 18A, 18B...control orifice, 21...
...constant ratio flow dividing valve, 22...output port, 23...output port, P 1 , P 2 ...pump port, T 1 ...
...tank port.
Claims (1)
機体とリフトアーム間に配設したリフトシリンダ
によりリフトアームを昇降回動させて昇降させる
と共にリフトアームとバケツト間に配設したチル
トシリンダにより転回させるようにされたフロン
トローダ等において、リフトシリンダに対する油
圧の給排を切替え制御する第１のコントロールバ
ルブの各作用位置でリフトシリンダからの戻り油
を排出するタンクポートに接続して、該戻り油を
２方向に分流する定比分流弁を設け、この定比分
流弁の一方の出力ポートをチルトシリンダに対す
る油圧の給排を切替え制御する第２のコントロー
ルバルブのポンプポートに、また他方の出力ポー
トを油タンクに、それぞれ接続して、前記戻り油
の一部でもつてチルトシリンダを伸縮動作させる
ように構成すると共に、前記定比分流弁を、前記
した両コントロールバルブを共に作用位置におい
て前記両シリンダを同時に伸縮動作させるときバ
ケツトがほぼ一定姿勢を維持しつつ昇降せしめら
れるように前記した第２のコントロールバルブの
ポンプポートに対する給油量を制御するバルブに
構成したことを特徴としてなるバケツト作動装置
。 The bucket is pivoted to the tip of the lift arm.
In front loaders, etc., in which the lift arm is raised and lowered by a lift cylinder placed between the aircraft and the lift arm, and rotated by a tilt cylinder placed between the lift arm and the bucket, the hydraulic pressure applied to the lift cylinder is At each operating position of the first control valve that switches and controls the supply and discharge of One output port of the constant ratio flow dividing valve is connected to a pump port of a second control valve that switches and controls the supply and discharge of hydraulic pressure to the tilt cylinder, and the other output port is connected to an oil tank to control the return oil. The tilt cylinder is configured to extend and retract at the same time, and the bucket maintains a substantially constant posture when both cylinders are simultaneously extended and retracted with both of the control valves in the operating position. A bucket actuating device characterized in that the valve is configured to control the amount of oil supplied to the pump port of the second control valve so as to be raised and lowered while moving up and down.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5200085U JPS61169166U (en) | 1985-04-08 | 1985-04-08 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5200085U JPS61169166U (en) | 1985-04-08 | 1985-04-08 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61169166U true JPS61169166U (en) | 1986-10-20 |
Family
ID=30571554
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5200085U Pending JPS61169166U (en) | 1985-04-08 | 1985-04-08 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61169166U (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01137023A (en) * | 1987-11-18 | 1989-05-30 | Sanyo Kiki Kk | Oil-pressure driver capable of parallel-moving of loader attachment for agricultural tractor |
| JP2011214263A (en) * | 2010-03-31 | 2011-10-27 | Kubota Corp | Hydraulic circuit of loader work machine and method of controlling hydraulic pressure of the same |
| JP2018194074A (en) * | 2017-05-16 | 2018-12-06 | 株式会社クボタ | Hydraulic system of working machine and control valve |
| JP2019173964A (en) * | 2018-03-28 | 2019-10-10 | 株式会社クボタ | Hydraulic system of work machine |
| JP2020193445A (en) * | 2019-05-24 | 2020-12-03 | 株式会社アイメック | Loader working machine |
| US10968923B2 (en) | 2017-05-16 | 2021-04-06 | Kubota Corporation | Hydraulic system for working machine and control valve |
| US11767660B2 (en) | 2017-05-16 | 2023-09-26 | Kubota Corporation | Control valve of hydraulic system for working machine |
-
1985
- 1985-04-08 JP JP5200085U patent/JPS61169166U/ja active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01137023A (en) * | 1987-11-18 | 1989-05-30 | Sanyo Kiki Kk | Oil-pressure driver capable of parallel-moving of loader attachment for agricultural tractor |
| JP2011214263A (en) * | 2010-03-31 | 2011-10-27 | Kubota Corp | Hydraulic circuit of loader work machine and method of controlling hydraulic pressure of the same |
| JP2018194074A (en) * | 2017-05-16 | 2018-12-06 | 株式会社クボタ | Hydraulic system of working machine and control valve |
| US10968923B2 (en) | 2017-05-16 | 2021-04-06 | Kubota Corporation | Hydraulic system for working machine and control valve |
| US11255353B2 (en) | 2017-05-16 | 2022-02-22 | Kubota Corporation | Hydraulic system of working machine |
| US11767660B2 (en) | 2017-05-16 | 2023-09-26 | Kubota Corporation | Control valve of hydraulic system for working machine |
| JP2019173964A (en) * | 2018-03-28 | 2019-10-10 | 株式会社クボタ | Hydraulic system of work machine |
| JP2020193445A (en) * | 2019-05-24 | 2020-12-03 | 株式会社アイメック | Loader working machine |
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