JPH01122502U - - Google Patents
Info
- Publication number
- JPH01122502U JPH01122502U JP1897888U JP1897888U JPH01122502U JP H01122502 U JPH01122502 U JP H01122502U JP 1897888 U JP1897888 U JP 1897888U JP 1897888 U JP1897888 U JP 1897888U JP H01122502 U JPH01122502 U JP H01122502U
- Authority
- JP
- Japan
- Prior art keywords
- spool
- side port
- valve body
- neutral position
- oil
- 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
- 230000007935 neutral effect Effects 0.000 claims 5
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Operation Control Of Excavators (AREA)
- Safety Valves (AREA)
- Fluid-Pressure Circuits (AREA)
Description
第１図は本考案の実施例を示す圧力制御弁の縦
断面図、第２図ないし第４図は従来技術を示し、
第２図は走行装置用油圧回路図、第３図は第２図
中の圧力制御弁を示す縦断面図、第４図はスプー
ルのストロークと流路面積との関係を示す特性線
図である。
１……油圧モータ、２Ａ，２Ｂ……主管路、３
……油圧ポンプ、４……タンク、５……方向切換
弁、６……ブレーキ弁、７Ａ，７Ｂ……リリーフ
弁、８……カウンタバランス弁、９Ａ，９Ｂ……
チエツク弁、１０Ａ，１０Ｂ，１１Ａ，１１Ｂ…
…分岐管路、１２……圧力制御弁、１６……弁本
体、１７……スプール摺動穴、１８Ａ，１８Ｂ，
２０Ａ，２０Ｂ……油溝、１９Ａ，１９Ｂ……油
圧源側ポート、２１Ａ，２１Ｂ……アクチユエー
タ側ポート、２３Ａ，２３Ｂ……油室、２４……
スプール、２５……中央ランド、２６Ａ，２６Ｂ
……ノツチ、２７Ａ，２７Ｂ……切換ランド、２
８Ａ，２８Ｂ……端部ランド、２９Ａ，２９Ｂ…
…絞り通路、３０Ａ，３０Ｂ……ストツパ、３１
Ａ，３１Ｂ……ばね、４１Ａ，４１Ｂ，４２Ａ，
４２Ｂ……環状溝、４３Ａ，４３Ｂ……油路。
FIG. 1 is a vertical sectional view of a pressure control valve showing an embodiment of the present invention, and FIGS. 2 to 4 show the prior art.
Fig. 2 is a hydraulic circuit diagram for the traveling device, Fig. 3 is a longitudinal sectional view showing the pressure control valve in Fig. 2, and Fig. 4 is a characteristic diagram showing the relationship between the stroke of the spool and the flow path area. . 1...Hydraulic motor, 2A, 2B...Main pipe, 3
... Hydraulic pump, 4 ... Tank, 5 ... Directional switching valve, 6 ... Brake valve, 7A, 7B ... Relief valve, 8 ... Counter balance valve, 9A, 9B ...
Check valve, 10A, 10B, 11A, 11B...
... Branch pipe line, 12 ... Pressure control valve, 16 ... Valve body, 17 ... Spool sliding hole, 18A, 18B,
20A, 20B...Oil groove, 19A, 19B...Hydraulic pressure source side port, 21A, 21B...Actuator side port, 23A, 23B...Oil chamber, 24...
Spool, 25...Central land, 26A, 26B
... Notsuchi, 27A, 27B ... Switching land, 2
8A, 28B... End land, 29A, 29B...
... Throttle passage, 30A, 30B... Stopper, 31
A, 31B... Spring, 41A, 41B, 42A,
42B...Annular groove, 43A, 43B...Oil passage.
Claims (1)
有する弁本体と、該弁本体内に摺動可能に挿嵌さ
れ、前記油圧源側ポートとアクチユエータ側ポー
トとを中立位置で遮断し、該中立位置から摺動し
たときに連通させるスプールと、該スプールの両
端側に位置して前記弁本体に形成された一対の油
室と、該各油室内に設けられ、前記スプールを常
時中立位置に付勢する一対のばねと、前記各油室
を前記油圧源側ポートと連通させる一対の絞り通
路とからなる圧力制御弁において、前記スプール
と弁本体との間には該スプールが中立位置および
中立位置の近傍にあるときに、前記各油室を油圧
源側ポートと連通させる油路を設けたことを特徴
とする圧力制御弁。 A valve body has a hydraulic power source side port and an actuator side port, and the valve body is slidably inserted into the valve body, the hydraulic power source side port and the actuator side port are cut off at a neutral position, and the valve body is slidably inserted from the neutral position. a spool that communicates when the spool is moved; a pair of oil chambers located on both ends of the spool and formed in the valve body; and a pair of oil chambers provided within each oil chamber that always urges the spool to a neutral position. In the pressure control valve, the pressure control valve includes a spring and a pair of restriction passages that communicate the oil chambers with the oil pressure source side port, and the spool is located between the spool and the valve body at a neutral position and near the neutral position. A pressure control valve characterized in that an oil passage is provided that communicates each of the oil chambers with a hydraulic pressure source side port at a certain time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1897888U JPH01122502U (en) | 1988-02-16 | 1988-02-16 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1897888U JPH01122502U (en) | 1988-02-16 | 1988-02-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01122502U true JPH01122502U (en) | 1989-08-21 |
Family
ID=31234095
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1897888U Pending JPH01122502U (en) | 1988-02-16 | 1988-02-16 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01122502U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1990012973A1 (en) * | 1989-04-24 | 1990-11-01 | Kabushiki Kaisha Komatsu Seisakusho | Counterbalance valve |
-
1988
- 1988-02-16 JP JP1897888U patent/JPH01122502U/ja active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1990012973A1 (en) * | 1989-04-24 | 1990-11-01 | Kabushiki Kaisha Komatsu Seisakusho | Counterbalance valve |
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