JPS6252302U - - Google Patents
Info
- Publication number
- JPS6252302U JPS6252302U JP14389085U JP14389085U JPS6252302U JP S6252302 U JPS6252302 U JP S6252302U JP 14389085 U JP14389085 U JP 14389085U JP 14389085 U JP14389085 U JP 14389085U JP S6252302 U JPS6252302 U JP S6252302U
- Authority
- JP
- Japan
- Prior art keywords
- port
- oil passage
- branch
- communication
- piston
- 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
- 238000010992 reflux Methods 0.000 claims description 2
- 239000003921 oil Substances 0.000 claims 13
- 239000010720 hydraulic oil Substances 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Fluid-Pressure Circuits (AREA)
Description
第１図及び第２図は、本考案に係る増速バルブ
の一実施例を示す各動作状態での縦断面図、第３
図乃至第５図は、本考案に係る増速バルブの第２
の実施例を示す図面で、第３図は正面図、第４図
並びに第５図は各動作状態での縦断面図、第６図
及び第７図は、本考案に係る増速バルブの第３の
実施例を示す各動作状態での縦断面図である。第
８図は、本考案の一対象例としての農用フロント
ローダの概略側面図、第９図は、上記農用フロン
トローダの油圧回路の概略図、第１０図及び第１
１図は、本考案の前提となる増速バルブの一例を
示す各動作状態での縦断面図である。
５……複動シリンダ、５ａ……ピストン前部室
、５ｂ……ピストン後部室、ａ……第１ポート、
ｂ……第２ポート、ｃ……第３ポート、ｄ……第
４ポート、７……第１のＬ字形連通油路、９……
第２のＬ字形連通油路、９ａ，５７ａ……分岐油
路、１０，５２……還流弁、３０，５９……逆止
弁、５７……連通油路。
1 and 2 are longitudinal cross-sectional views showing one embodiment of the speed increasing valve according to the present invention in each operating state, and FIG.
Figures 5 to 5 show the second speed increasing valve according to the present invention.
FIG. 3 is a front view, FIGS. 4 and 5 are longitudinal sectional views in each operating state, and FIGS. 6 and 7 are diagrams showing an example of the speed increasing valve according to the present invention. FIG. 3 is a vertical cross-sectional view showing the third embodiment in each operating state. FIG. 8 is a schematic side view of an agricultural front loader as an example of the object of the present invention, FIG. 9 is a schematic diagram of the hydraulic circuit of the agricultural front loader, and FIGS.
FIG. 1 is a longitudinal sectional view showing an example of a speed increasing valve in various operating states, which is the premise of the present invention. 5... Double acting cylinder, 5a... Piston front chamber, 5b... Piston rear chamber, a... First port,
b...Second port, c...Third port, d...Fourth port, 7...First L-shaped communication oil passage, 9...
2nd L-shaped communication oil passage, 9a, 57a... Branch oil passage, 10, 52... Reflux valve, 30, 59... Check valve, 57... Communication oil passage.
Claims (1)
続される第１ポートと、ピストン後部室に接続さ
れる第２ポートと、油圧ポンプ並びにタンクに方
向制御弁を介して切換接続される第３並びに第４
ポートと、上記第２ポートと第３ポートとを常時
連通させる連通油路と、上記第１ポートと上記連
通油路からの分岐油路との間に配設され、複動シ
リンダ伸長動作時にピストン前部室から第１ポー
トに流入する戻り油を上記連通油路に流通させる
還流弁と、この還流弁に設けられ、上記複動シリ
ンダの伸長動作時に上記ピストン前部室からの戻
り油の一部を第４ポートに流通させる絞り通路と
を具備する増速バルブにおいて、上記連通油路と
この分岐油路との間に、連通油路から分岐油路へ
の作動油の流通を阻止する逆止弁を設けたことを
特徴とする増速バルブ。 A first port connected to the piston front chamber of the single-rod type double-acting cylinder, a second port connected to the piston rear chamber, and a third port and a third port connected to the hydraulic pump and tank via a directional control valve. 4
A communication oil passage that constantly communicates between the port, the second port and the third port, and a branch oil passage from the first port and the communication oil passage, and is arranged between the first port and a branch oil passage from the communication oil passage, and is arranged between the first port and a branch oil passage from the communication oil passage, so that the piston can a reflux valve that allows return oil flowing into the first port from the front chamber to flow through the communication oil passage; In the speed increasing valve that is provided with a throttle passage that flows to the fourth port, a check valve is provided between the communicating oil passage and this branch oil passage to prevent the flow of hydraulic oil from the communicating oil passage to the branch oil passage. A speed increasing valve characterized by being provided with.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14389085U JPH0339601Y2 (en) | 1985-09-19 | 1985-09-19 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14389085U JPH0339601Y2 (en) | 1985-09-19 | 1985-09-19 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6252302U true JPS6252302U (en) | 1987-04-01 |
| JPH0339601Y2 JPH0339601Y2 (en) | 1991-08-21 |
Family
ID=31053991
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14389085U Expired JPH0339601Y2 (en) | 1985-09-19 | 1985-09-19 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0339601Y2 (en) |
-
1985
- 1985-09-19 JP JP14389085U patent/JPH0339601Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0339601Y2 (en) | 1991-08-21 |
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