JPH0160617U - - Google Patents
Info
- Publication number
- JPH0160617U JPH0160617U JP15566987U JP15566987U JPH0160617U JP H0160617 U JPH0160617 U JP H0160617U JP 15566987 U JP15566987 U JP 15566987U JP 15566987 U JP15566987 U JP 15566987U JP H0160617 U JPH0160617 U JP H0160617U
- Authority
- JP
- Japan
- Prior art keywords
- check valve
- hydraulic
- valve
- back pressure
- pilot solenoid
- 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
- 239000010720 hydraulic oil Substances 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 1
Landscapes
- Lifting Devices For Agricultural Implements (AREA)
- Fluid-Pressure Circuits (AREA)
Description
第１図は本考案の油圧回路図。第２図は緩下降
の状態を示す油圧制御装置側面断面図。第３図は
急下降の状態を示す油圧制御装置側面断面図であ
る。
６……チエツクバルブ、７……パイロツト電磁
弁、Ｖ……スローリターンバルブ、１１……ポジ
シヨンコントロールレバー。
Figure 1 is a hydraulic circuit diagram of the present invention. FIG. 2 is a side sectional view of the hydraulic control device showing a state of gradual descent. FIG. 3 is a side sectional view of the hydraulic control device showing a state of rapid descent. 6...Check valve, 7...Pilot solenoid valve, V...Slow return valve, 11...Position control lever.
Claims (1)
において、パイロツト電磁弁７をスローリターン
バルブＶを構成するチエツクバルブ６の背圧油路
回路内に設け、ポジシヨンコントロールレバー１
１の操作に連動して前記パイロツト電磁弁７を切
り換えて、該チエツクバルブ６の背圧回路を作動
油タンク８に連通自在としてチエツクバルブ６の
開閉動作により選択し、急下降、緩下降を得るべ
く構成したことを特徴とするトラクターの油圧制
御装置。 In a hydraulic system for raising and lowering a tractor working machine, a pilot solenoid valve 7 is provided in the back pressure hydraulic circuit of a check valve 6 constituting a slow return valve V, and a position control lever 1
The pilot solenoid valve 7 is switched in conjunction with the operation of step 1, and the back pressure circuit of the check valve 6 is freely communicated with the hydraulic oil tank 8, which is selected by the opening/closing operation of the check valve 6 to obtain rapid descent or gradual descent. A hydraulic control device for a tractor, characterized in that it is configured as follows.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15566987U JPH0160617U (en) | 1987-10-12 | 1987-10-12 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15566987U JPH0160617U (en) | 1987-10-12 | 1987-10-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0160617U true JPH0160617U (en) | 1989-04-18 |
Family
ID=31433503
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15566987U Pending JPH0160617U (en) | 1987-10-12 | 1987-10-12 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0160617U (en) |
-
1987
- 1987-10-12 JP JP15566987U patent/JPH0160617U/ja active Pending