JPS61119606U - - Google Patents
Info
- Publication number
- JPS61119606U JPS61119606U JP443385U JP443385U JPS61119606U JP S61119606 U JPS61119606 U JP S61119606U JP 443385 U JP443385 U JP 443385U JP 443385 U JP443385 U JP 443385U JP S61119606 U JPS61119606 U JP S61119606U
- Authority
- JP
- Japan
- Prior art keywords
- port
- main spool
- check valve
- oil passage
- working
- 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
- 230000007935 neutral effect Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Harvester Elements (AREA)
- Fluid-Pressure Circuits (AREA)
- Lifting Devices For Agricultural Implements (AREA)
Description
図面は本考案に係る作業機の作業部昇降用制御
弁の実施例を示し、第１図は主スプール中立状態
に於る制御弁の断面図、第２図及び第３図は自動
制御時に於て夫々主スプールを操作した状態での
断面図、第４図及び第５図は制御弁、ソレノイド
等を示す図、第６図は制御系を示す概略図、第７
図はコンバイン前部の側面図である。
４…油圧シリンダ、１７…主スプール、２４…
ピストン、２５…パイロツト式チエツク弁、２７
…一次側油路、２８…パイロツト圧油路、３１…
オリフイス、３２…第２オリフイス、Ｃ…キヤリ
ーオーバーポート、Ｔ…ドレンポート、Ｎ…主ス
プールの中立位置、Ｐ…ポンプポート。
The drawings show an embodiment of the control valve for lifting and lowering the working part of a working machine according to the present invention. FIG. 1 is a sectional view of the control valve when the main spool is in the neutral state, and FIGS. 2 and 3 are cross-sectional views of the control valve during automatic control. Figures 4 and 5 are diagrams showing control valves, solenoids, etc., Figure 6 is a schematic diagram showing the control system, Figure 7
The figure is a side view of the front part of the combine. 4...Hydraulic cylinder, 17...Main spool, 24...
Piston, 25...Pilot check valve, 27
...Primary oil passage, 28...Pilot pressure oil passage, 31...
Orifice, 32...Second orifice, C...Carry over port, T...Drain port, N...neutral position of main spool, P...pump port.
Claims (1)
用ポートＧの上手にパイロツト式チエツク弁２５
を設け、主スプール１７の中立位置Ｎにおいて前
記チエツク弁２５の一次側油路２７をドレンポー
トＤに連通するとともに、ポンプポートＰを他の
油圧操作回路へのキヤリーオーバーポートＣに連
通し、主スプール１７の作業部上昇側へのシフト
によつて前記ポンプポートＰを前記パイロツト式
チエツク弁２５の一次側油路２７に連通し、主ス
プール１７の作業部下降側へのシフトによつて前
記パイロツト式チエツク弁２５の一次側油路２７
をドレンポートＤに連通するとともに、前記チエ
ツク弁２５を強制開路するピストン２４のパイロ
ツト圧油路２８をポンプポートＰに連通するよう
構成し、かつ、前記主スプール１７が作業部上昇
側エンド近傍以外のシフト範囲にあるときに、前
記キヤリーオーバーポートＣとポンプポートＰと
を連通するオリフイス３１を主スプール１７に設
けてある作業機の作業部昇降用制御弁であつて、
前記主スプール１７が作業部下降側へシフトされ
たときにポンプポートＰとキヤリーオーバーポー
トＣとを連通する第２のオリフイス３２をパイロ
ツト圧発生用オリフイスとして主スプール１７に
設けてある作業機の作業部昇降用制御弁。 A pilot type check valve 25 is installed at the output port G to the single-acting hydraulic cylinder 4 for lifting and lowering the working part.
and communicates the primary side oil passage 27 of the check valve 25 with the drain port D at the neutral position N of the main spool 17, and communicates the pump port P with a carry over port C to another hydraulic operation circuit, By shifting the main spool 17 toward the upward side of the working section, the pump port P is communicated with the primary oil passage 27 of the pilot check valve 25, and by shifting the main spool 17 toward the downward side of the working section, the pump port P is communicated with the primary oil passage 27 of the pilot check valve 25. Primary side oil passage 27 of pilot type check valve 25
The main spool 17 is configured to communicate with the drain port D, and the pilot pressure oil passage 28 of the piston 24 for forcibly opening the check valve 25 is communicated with the pump port P. The control valve for lifting and lowering the working part of a working machine is provided with an orifice 31 in the main spool 17 that communicates the carry over port C and the pump port P when the shift range is in the range of
When the main spool 17 is shifted to the lowering side of the working part, the second orifice 32 that communicates the pump port P and the carry over port C is used as a pilot pressure generating orifice, which is provided on the main spool 17 to control the working machine. Control valve for lifting and lowering working parts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP443385U JPH0338966Y2 (en) | 1985-01-16 | 1985-01-16 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP443385U JPH0338966Y2 (en) | 1985-01-16 | 1985-01-16 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61119606U true JPS61119606U (en) | 1986-07-28 |
| JPH0338966Y2 JPH0338966Y2 (en) | 1991-08-16 |
Family
ID=30479996
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP443385U Expired JPH0338966Y2 (en) | 1985-01-16 | 1985-01-16 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0338966Y2 (en) |
-
1985
- 1985-01-16 JP JP443385U patent/JPH0338966Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0338966Y2 (en) | 1991-08-16 |
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