JPS6456611U - - Google Patents
Info
- Publication number
- JPS6456611U JPS6456611U JP14981787U JP14981787U JPS6456611U JP S6456611 U JPS6456611 U JP S6456611U JP 14981787 U JP14981787 U JP 14981787U JP 14981787 U JP14981787 U JP 14981787U JP S6456611 U JPS6456611 U JP S6456611U
- Authority
- JP
- Japan
- Prior art keywords
- solenoid valve
- oil
- oil passage
- orifice
- valve
- 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.)
- Granted
Links
- 238000010586 diagram Methods 0.000 description 6
- 230000001174 ascending effect Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Landscapes
- Lifting Devices For Agricultural Implements (AREA)
- Fluid-Pressure Circuits (AREA)
Description
図面は、本考案に係る作業用走行車の作業部昇
降速度制御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側面図、第２図は制御シ
ステムのブロツク回路図、第３図は同上フローチ
ヤート図、第４図は同上タイミングチヤート図、
第５図は中立状態を示す油圧回路図、第６図は上
昇状態を示す油圧回路図、第７図は高速下降状態
を示す油圧回路図、第８図は低速下降状態を示す
油圧回路図、第９図は従来例を示す油圧回路図で
ある。
図中、１は走行機体、３は作業部、４はリフト
アーム、５はリフトアームシリンダ、１０は流量
制御用ソレノイドバルブ、１１は上昇用ソレノイ
ドバルブ、１２は下降用ソレノイドバルブ、１３
はアンロードバルブ、１４は下降用ポペツトバル
ブ、１６ａ，１７ａはオリフイスである。
The drawings show an embodiment of the working part lifting/lowering speed control device for a working vehicle according to the present invention,
Fig. 1 is a side view of the agricultural tractor, Fig. 2 is a block circuit diagram of the control system, Fig. 3 is a flowchart of the same as above, Fig. 4 is a timing chart of the same as above,
Fig. 5 is a hydraulic circuit diagram showing a neutral state, Fig. 6 is a hydraulic circuit diagram showing a rising state, Fig. 7 is a hydraulic circuit diagram showing a high-speed descending state, and Fig. 8 is a hydraulic circuit diagram showing a low-speed descending state. FIG. 9 is a hydraulic circuit diagram showing a conventional example. In the figure, 1 is a traveling machine body, 3 is a working part, 4 is a lift arm, 5 is a lift arm cylinder, 10 is a solenoid valve for flow control, 11 is a solenoid valve for ascending, 12 is a solenoid valve for descending, 13
14 is an unload valve, 14 is a lowering poppet valve, and 16a and 17a are orifices.
Claims (1)
する油圧回路中に、リフトアームシリンダから油
タンクに至る戻し油路中に配した下降用ポペツト
バルブに対する背圧油路の開閉切換えを行う下降
用ソレノイドバルブと、該下降用ソレノイドバル
ブから油タンクに至る戻り油路にバルブ出口側が
接続され、油圧ポンプからリフトアームシリンダ
への送出し油路にバルブ入口側が接続された流量
制御用ソレノイドバルブとを設け、前記作業部が
目標高さに近いときに流量制御用ソレノイドバル
ブを開状態へ切換えることで、油圧ポンプからの
圧油の一部を流量制御用ソレノイドバルブを経由
して油タンクに戻すことで昇降速度の減速制御を
行うように構成したことを特徴とする作業用走行
車の作業部昇降速度制御装置。 (2) 前記流量制御用ソレノイドバルブの出口側
油路は第一オリフイスを設けて構成されている一
方、下降用ソレノイドバルブから油タンクへの戻
り油路は、出口側油路の接続部よりも油タンク側
に上記第一オリフイスよりもオリフイス径が大き
い第二オリフイスを設けて構成されていることを
特徴とする実用新案登録請求の範囲第１項記載の
作業用走行車の作業部昇降速度制御装置。[Scope of Claim for Utility Model Registration] (1) Opening/closing of a back pressure oil passage for a lowering poppet valve arranged in a return oil passage from the lift arm cylinder to an oil tank in a hydraulic circuit for a lift arm cylinder for raising and lowering a working part. Flow rate control with a descending solenoid valve that performs switching, the valve outlet side connected to the return oil path from the descending solenoid valve to the oil tank, and the valve inlet side connected to the sending oil path from the hydraulic pump to the lift arm cylinder. By switching the flow control solenoid valve to the open state when the working part is close to the target height, a part of the pressure oil from the hydraulic pump is routed through the flow control solenoid valve. 1. A working part lifting/lowering speed control device for a working vehicle, characterized in that the lifting speed is controlled to be reduced by returning oil to a tank. (2) The outlet side oil passage of the flow rate control solenoid valve is configured with a first orifice, while the return oil passage from the descending solenoid valve to the oil tank is closer than the connection part of the outlet side oil passage. The working part lifting/lowering speed control of a working vehicle according to claim 1 of the registered utility model claim, characterized in that a second orifice having a larger orifice diameter than the first orifice is provided on the oil tank side. Device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987149817U JPH0711524Y2 (en) | 1987-09-30 | 1987-09-30 | Lifting speed control device for work unit of work vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987149817U JPH0711524Y2 (en) | 1987-09-30 | 1987-09-30 | Lifting speed control device for work unit of work vehicle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6456611U true JPS6456611U (en) | 1989-04-10 |
| JPH0711524Y2 JPH0711524Y2 (en) | 1995-03-22 |
Family
ID=31422393
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1987149817U Expired - Lifetime JPH0711524Y2 (en) | 1987-09-30 | 1987-09-30 | Lifting speed control device for work unit of work vehicle |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0711524Y2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7658769B2 (en) | 2005-11-11 | 2010-02-09 | Hoyu Co., Ltd. | Oxidation hair dye composition |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51101683A (en) * | 1975-03-01 | 1976-09-08 | Kubota Ltd | YUATSURATSUKACHOSEISOCHI |
| JPS621001A (en) * | 1985-06-26 | 1987-01-07 | Kubota Ltd | Drive control mechanism for actuator of working machine |
-
1987
- 1987-09-30 JP JP1987149817U patent/JPH0711524Y2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51101683A (en) * | 1975-03-01 | 1976-09-08 | Kubota Ltd | YUATSURATSUKACHOSEISOCHI |
| JPS621001A (en) * | 1985-06-26 | 1987-01-07 | Kubota Ltd | Drive control mechanism for actuator of working machine |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7658769B2 (en) | 2005-11-11 | 2010-02-09 | Hoyu Co., Ltd. | Oxidation hair dye composition |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0711524Y2 (en) | 1995-03-22 |
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