JPH039107U - - Google Patents
Info
- Publication number
- JPH039107U JPH039107U JP6628289U JP6628289U JPH039107U JP H039107 U JPH039107 U JP H039107U JP 6628289 U JP6628289 U JP 6628289U JP 6628289 U JP6628289 U JP 6628289U JP H039107 U JPH039107 U JP H039107U
- Authority
- JP
- Japan
- Prior art keywords
- lowering
- solenoid valve
- circuit
- valve
- hydraulic
- 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
- 230000003321 amplification Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
Description
第１図〜第２図は本考案の一実施例を示し、第
１図は本考案を実施した農用トラクタの全体側面
図、第２図は油圧回路図である。第３図は従来例
を示す油圧回路図である。
Ｔ……農用トラクタ、Ｏ……作業機昇降装置、
４……ミツシヨンケース（タンク）、１０……リ
フトアーム、１５……油圧ケース、１６……リフ
ト軸、１７……ロアリンク、１９……連結ロツド
、２０……油圧シリンダ、２２……油圧ピストン
、２３……油圧ポンプ、２５……制御機構、Ｖ１
……上げ電磁弁、Ｖ２……下げ電磁弁、Ｖ３……
上げ流量増幅弁、Ｖ４……チエツク弁、Ｖ５……
下げ流量増幅弁、２６……下降速度調整弁、２７
……軽負荷専用下げ電磁弁、２９……配管、３１
……配管。
1 and 2 show an embodiment of the present invention, FIG. 1 is an overall side view of an agricultural tractor implementing the present invention, and FIG. 2 is a hydraulic circuit diagram. FIG. 3 is a hydraulic circuit diagram showing a conventional example. T...Agricultural tractor, O...Work equipment lifting device,
4... Mission case (tank), 10... Lift arm, 15... Hydraulic case, 16... Lift shaft, 17... Lower link, 19... Connection rod, 20... Hydraulic cylinder, 22... Hydraulic pressure Piston, 23... Hydraulic pump, 25... Control mechanism, V 1
...Raise solenoid valve, V 2 ...Lower solenoid valve, V 3 ...
Raising flow rate amplification valve, V 4 ... Check valve, V 5 ...
Lowering flow rate amplification valve, 26... Lowering speed adjustment valve, 27
...Low load solenoid valve, 29...Piping, 31
……Piping.
Claims (1)
れチエツク弁を有する油圧回路に、上げ側回路を
構成する上げ電磁弁並びに上げ流量増幅弁、下げ
側回路を構成する下げ電磁弁並びに下げ流量増幅
弁からなる制御機構を接続した作業機昇降装置に
おいて、上記制御機構と油圧シリンダとの間の油
圧回路にスイツチのＯＮ・ＯＦＦ操作により開閉
する軽負荷専用下げ電磁弁を接続し、下げ回路を
、下げ電磁弁のみの開状態と、下げ電磁弁および
軽負荷専用下げ電磁弁の開状態とに選択切換自在
に構成してなる農用トラクタの作業機昇降装置。 A hydraulic circuit that is connected to a single-acting hydraulic cylinder and a hydraulic pump and has a check valve includes a raising solenoid valve and a raising flow amplifying valve that constitute the raising side circuit, and a lowering solenoid valve and a lowering flow rate amplifying valve that constitute the lowering side circuit. In a work equipment lifting device connected to a control mechanism consisting of a lowering circuit, a lowering solenoid valve exclusively for light loads, which is opened and closed by ON/OFF operation of a switch, is connected to the hydraulic circuit between the control mechanism and the hydraulic cylinder, and the lowering circuit is A work equipment lifting device for an agricultural tractor that is configured to be selectively switchable between an open state of only a solenoid valve and an open state of a lowering solenoid valve and a lowering solenoid valve exclusively for light loads.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6628289U JPH039107U (en) | 1989-06-08 | 1989-06-08 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6628289U JPH039107U (en) | 1989-06-08 | 1989-06-08 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH039107U true JPH039107U (en) | 1991-01-29 |
Family
ID=31598861
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6628289U Pending JPH039107U (en) | 1989-06-08 | 1989-06-08 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH039107U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006177451A (en) * | 2004-12-22 | 2006-07-06 | Kayaba Ind Co Ltd | Slow return valve and hydraulic drive unit |
-
1989
- 1989-06-08 JP JP6628289U patent/JPH039107U/ja active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006177451A (en) * | 2004-12-22 | 2006-07-06 | Kayaba Ind Co Ltd | Slow return valve and hydraulic drive unit |
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