JPH0213816Y2 - - Google Patents
Info
- Publication number
- JPH0213816Y2 JPH0213816Y2 JP1983158137U JP15813783U JPH0213816Y2 JP H0213816 Y2 JPH0213816 Y2 JP H0213816Y2 JP 1983158137 U JP1983158137 U JP 1983158137U JP 15813783 U JP15813783 U JP 15813783U JP H0213816 Y2 JPH0213816 Y2 JP H0213816Y2
- Authority
- JP
- Japan
- Prior art keywords
- port
- spool
- oil
- valve
- hole
- 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.)
- Expired
Links
- 230000000903 blocking effect Effects 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims description 3
- 239000003921 oil Substances 0.000 description 35
- 230000007935 neutral effect Effects 0.000 description 11
- 238000013016 damping Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
Landscapes
- Safety Valves (AREA)
- Fluid-Pressure Circuits (AREA)
Description
【考案の詳細な説明】
本考案は、油圧駆動ウインチの油圧モータ又は
油圧シリンダ等の油圧アクチユエータと油圧ポン
プとの接続回路に設けられるカウンタバランス弁
に関するものである。[Detailed Description of the Invention] The present invention relates to a counterbalance valve provided in a connection circuit between a hydraulic actuator such as a hydraulic motor or a hydraulic cylinder of a hydraulically driven winch and a hydraulic pump.
従来のカウンタバランス弁としては第１図に示
すように、弁本体ａに、油圧モータｃに接続した
第１ポートｄと油圧モータｃに接続した第２ポー
トｅと第３ポートｇとを形成し、第１、第３ポー
トｄ，ｇを切換弁ｍでポンプｂとタンクｆとに連
通制御すると共に、第２ポートｅと第３ポートｇ
とを断通するスプールｈを設け、このスプールｈ
をバネｉで遮断位置に保持し、かつ絞りｊを介し
て第１ポートｄに連通した受圧室ｋ内の油圧力で
連通位置に押動するように構成すると共に、第２
ポートｅと第３ポートｇと逆止弁ｌを介して連通
したカウンタバランス弁が知られている。 As shown in Fig. 1, a conventional counterbalance valve has a valve body a with a first port d connected to a hydraulic motor c, a second port e connected to the hydraulic motor c, and a third port g. , the first and third ports d and g are controlled to communicate with the pump b and the tank f by the switching valve m, and the second port e and the third port g are controlled to communicate with the pump b and the tank f.
A spool h is provided to disconnect the spool h.
is held in a blocking position by a spring i and pushed to a communicating position by hydraulic pressure in a pressure receiving chamber k communicating with a first port d via a throttle j.
A counterbalance valve is known in which a port e and a third port g communicate with each other via a check valve l.
このカウンタバランス弁であると、切換弁ｍを
中立位置Ｎとした場合にはポンプｂの圧油が供給
されないから、スプールｈはバネｉで図示位置に
保持され、切換弁ｍを上げ位置とするとポンプ
ｂの圧油は第３ポートｇに流入し、逆止弁ｌを押
し開いて第２ポートｅに流入して油圧モータｃに
供給され、油圧モータｃより第１ポートｄを通つ
てタンクｆに油が排出される。 With this counterbalance valve, when the switching valve m is set to the neutral position N, the pressure oil of the pump b is not supplied, so the spool h is held at the position shown by the spring i, and when the switching valve m is set to the raised position. Pressure oil from pump b flows into the third port g, pushes open the check valve l, flows into the second port e, is supplied to the hydraulic motor c, and is passed from the hydraulic motor c through the first port d to the tank f. Oil is discharged.
また、切換弁ｍを下げ位置とするとモータｂ
の圧油は第１ポートｄより油圧モータｃに供給さ
れると共に、第３ポートｇがタンクｆに連通する
が、第３ポートｇはスプールｈで第２ポートｅと
遮断されているので、油圧モータｃの油は直ちに
タンクｆに流出せずに、第１ポートｄ内の油圧が
ある程度上昇して絞りｊを介して受圧室ｋ内の圧
力がある程度上昇してスプールｈが右方に押動さ
れ第２ポートｅと第３ポートｇが連通すると油圧
モータｃが回転するようになり、油圧モータｃに
作用する外力の大きさに関係なく常に一定速度で
回転できるようにしてある。 Also, when the switching valve m is in the lower position, the motor b
Pressure oil is supplied from the first port d to the hydraulic motor c, and the third port g communicates with the tank f, but since the third port g is cut off from the second port e by the spool h, the hydraulic oil is The oil in the motor c does not immediately flow into the tank f, but the oil pressure in the first port d rises to a certain extent, and the pressure in the pressure receiving chamber k rises to a certain extent through the throttle j, pushing the spool h to the right. When the second port e and the third port g communicate with each other, the hydraulic motor c starts to rotate, and can always rotate at a constant speed regardless of the magnitude of the external force acting on the hydraulic motor c.
例えば、油圧モータｃでウインチを駆動する場
合には油圧モータｃには吊り下げ物の重量によつ
て回転力を受けているので、スプールｈがないと
切換弁ｍを下げ位置とすると油圧モータｃは吊
り下げ物の重量によつて回転されてしまうから、
吊り下げ物の下降速度はその重量によつて決定さ
れてしまうが、スプールｈがあれば重量に関係な
く一定速度で下降できる。 For example, when driving a winch with hydraulic motor c, hydraulic motor c receives rotational force from the weight of the suspended object, so if there is no spool h and switching valve m is in the lower position, hydraulic motor c is rotated by the weight of the hanging object,
The descending speed of a suspended object is determined by its weight, but with the spool h, it can descend at a constant speed regardless of its weight.
しかし、その反面、前述の状態より切換弁ｍを
中立位置Ｎとした時には、スプールｈは受圧室ｋ
内の圧油が絞りｊを介して排出された後にバネｉ
で左方に押動されて第２ポートｅと第３ポートｇ
とを連通位置（つまり、中立位置）に移動するの
でスプールｈの復帰速度が遅くなり、その間に油
圧モータｃが回転してしまい、吊り下げ物が下降
してしまう不具合を有する。 However, on the other hand, when the switching valve m is set to the neutral position N from the above-mentioned state, the spool h is moved to the pressure receiving chamber k.
After the pressure oil inside is discharged through the throttle j, the spring i
, the second port e and third port g are pushed to the left.
Since the spool h is moved to the communication position (that is, the neutral position), the return speed of the spool h is slow, and during this time the hydraulic motor c rotates, causing the problem that the suspended object descends.
本考案は上記の事情に鑑みなされたものであ
り、その目的は、スプールが迅速に中立位置に復
帰するようにしたカウンタバランス弁を提供する
ことである。 The present invention was developed in view of the above circumstances, and its purpose is to provide a counterbalance valve that allows the spool to quickly return to the neutral position.
以下第２図、第３図を参照して本考案の実施例
を説明する。 Embodiments of the present invention will be described below with reference to FIGS. 2 and 3.
弁本体１には第１〜第４ポート２1〜２4と弁孔
３が形成され、弁孔３には第１〜第４環状溝４1
〜４4が形成してあり、第１ポート２1と第２環状
溝４2とは第１油孔５1で連通し、第２ポート２2
は第３環状溝４3と第２油孔５2で連通し、第３ポ
ート２3は第３油孔５3で第１環状溝４1に連通し、
第４ポート２4は第４油孔５4で第４環状溝４4に
連通していると共に、第１油孔５1と第３油孔５3
とは短絡路６で連通し、かつ第３油孔５3より第
１油孔５1側への流通を阻止する逆止弁７が設け
てあり、第２油孔５2と第４油孔５4とは短絡路８
で連通してある。 The valve body 1 is formed with first to fourth ports 21 to 24 and a valve hole 3, and the valve hole 3 is provided with first to fourth annular grooves 41.
~ 44 are formed, the first port 21 and the second annular groove 42 communicate through the first oil hole 51 , and the second port 22
communicates with the third annular groove 4 3 through the second oil hole 5 2 , the third port 2 3 communicates with the first annular groove 4 1 through the third oil hole 5 3 ,
The fourth port 24 communicates with the fourth annular groove 44 through a fourth oil hole 54 , and also communicates with the first oil hole 51 and the third oil hole 53.
A check valve 7 is provided which communicates with the through a short circuit path 6 and prevents flow from the third oil hole 5 3 to the first oil hole 5 1 side. 5 4 is a short circuit 8
It is communicated with.
前記弁孔３にはスプール９が嵌挿され、このス
プール９には第１、第２環状溝４1，４2、第３、
第４環状溝４3，４4を断通する第１、第２小径部
１０1，１０2が形成され、かつ第１バネ１１で第
１、第２及び第３、第４環状溝４1，４2及び４3，
４4を遮断する位置に保持してある。１２は第２
バネであり、スプール９の一端面９ａと隙間S1を
有して離隔している。 A spool 9 is fitted into the valve hole 3, and the spool 9 has first and second annular grooves 4 1 , 4 2 , a third annular groove,
First and second small diameter portions 10 1 , 10 2 are formed to cut through the fourth annular grooves 4 3 , 4 4 , and the first spring 11 is connected to the first, second, third, and fourth annular grooves 4 1 . , 4 2 and 4 3 ,
4 It is held in a position that blocks 4 . 12 is the second
It is a spring and is separated from one end surface 9a of the spool 9 with a gap S1 .
前記スプール９の他端側は受圧室２１に臨ませ
てあると共に、盲穴１３が形成され、この盲穴１
３は油路１４を介して第２小径部１０2に開口し
ていると共に、盲穴１３には盲栓１５が螺合して
あり、この盲栓１５には油路１４と同芯状の孔１
６が形成され、この孔１６には絞り１７が設けて
あると共に、孔１６と油路１４とはポール１８と
バネ１９とより成る逆止弁２０を介して連通して
いる。そして油路１４は細孔２２で受圧室２１に
開口している。 The other end of the spool 9 faces the pressure receiving chamber 21 and has a blind hole 13 formed therein.
3 opens into the second small diameter portion 10 2 via an oil passage 14, and a blind plug 15 is screwed into the blind hole 13. Hole 1
The hole 16 is provided with a throttle 17, and the hole 16 and the oil passage 14 communicate with each other via a check valve 20 made up of a pawl 18 and a spring 19. The oil passage 14 opens into the pressure receiving chamber 21 through a small hole 22 .
そして、第１、第２ポート２1，２2は切換弁２
３を介して油圧ポンプ２４とタンク２５に連通制
御され、第３、第４ポートポート２3，２4は油圧
モータ２６に接続してある。 The first and second ports 2 1 and 2 2 are the switching valves 2
The third and fourth ports 2 3 and 2 4 are connected to a hydraulic motor 26 .
しかして、切換弁２３を中立位置Ｎから上げ位
置とすれば従来と同様に、油圧ポンプ２４の吐
出圧油は第１ポート２1→第１油孔５1→短絡路６
→逆止弁７を押し開いて第３油孔５3→第３ポー
ト２3→油圧モータ２６と流れ、油圧モータ２６
の油は第４ポート２4→第４油孔５4→短絡路８→
第２油孔４2→第２ポート２2より切換弁２３を通
つてタンク２５に排出される。 If the switching valve 23 is moved from the neutral position N to the raised position, the pressure oil discharged from the hydraulic pump 24 will flow from the first port 2 1 to the first oil hole 5 1 to the short-circuit path 6 as in the conventional case.
→ Push open the check valve 7 to open the third oil hole 5 3 → Third port 2 3 → Hydraulic motor 26 and flow to the hydraulic motor 26
The oil is from the 4th port 2 4 →4th oil hole 5 4 →short circuit 8→
The oil is discharged from the second oil hole 4 2 →second port 2 2 to the tank 25 through the switching valve 23.
切換弁２３を中立位置Ｎから下げ位置とすれ
ば前述と同様に、第２ポート２2→第２油孔５2→
短絡路８→第４油孔５4→第４ポート２4より油圧
モータ２６に供給されるが、スプール９で第１、
第２環状溝４1，４2が閉塞されているから、第２
ポート２2と第４ポート２4間の油圧が上昇する。 If the switching valve 23 is moved from the neutral position N to the lowered position, the second port 2 2 → second oil hole 5 2 →
The hydraulic motor 26 is supplied from the short circuit path 8 → the fourth oil hole 5 4 → the fourth port 2 4 , but the spool 9
Since the second annular grooves 4 1 and 4 2 are closed, the second annular grooves 4 1 and 4 2 are closed.
The oil pressure between port 2 2 and fourth port 2 4 increases.
この油圧は第２小径部１０2→油路１４→細孔
２２を通つて受圧室２１に供給され、スプール９
を第１バネ１１に抗して左方に押動し、第１小径
部１０1で第１、第２環状溝４1，４2を連通する。
この時細孔２２は弁孔３で閉塞され、その後は弁
孔３とスプール９との隙間より受圧室２１に圧油
が供給される。 This oil pressure is supplied to the pressure receiving chamber 21 through the second small diameter portion 10 2 → oil passage 14 → small hole 22, and is supplied to the pressure receiving chamber 21 through the spool 9
is pushed to the left against the first spring 11 to communicate the first and second annular grooves 4 1 and 4 2 at the first small diameter portion 10 1 .
At this time, the small hole 22 is closed by the valve hole 3, and after that, pressure oil is supplied to the pressure receiving chamber 21 through the gap between the valve hole 3 and the spool 9.
そして、スプール９が左方にある程度押動され
ると第２バネ１２に当接する。 Then, when the spool 9 is pushed leftward to some extent, it comes into contact with the second spring 12.
この様に、受圧室２１内には細孔２２で圧油が
急速に供給されるから、スプール９は急速に第
１、第２環状溝４1，４2を連通位置に移動され、
油圧モータ２６側のとじ込み圧力が急上昇するこ
とを極力防止できる。 In this way, pressure oil is rapidly supplied into the pressure receiving chamber 21 through the pores 22, so the spool 9 is rapidly moved to a position where the first and second annular grooves 4 1 and 4 2 are connected.
A sudden increase in the locking pressure on the hydraulic motor 26 side can be prevented as much as possible.
また、スプール９が連通位置となるとスプール
９と弁孔３との隙間（つまり、強い絞りを経て）
より受圧室２１内に圧油が供給されるから、スプ
ール９の動きに対して強いダンピング作用を与え
ることができる。 Also, when the spool 9 is in the communication position, the gap between the spool 9 and the valve hole 3 (that is, after being strongly throttled)
Since more pressure oil is supplied into the pressure receiving chamber 21, a strong damping effect can be applied to the movement of the spool 9.
また、切換弁２３を下げ位置より中立位置Ｎ
に復帰させると、第２ポート２2がタンク２５側
に連通するから、受圧室２１内の圧油はボール１
８をバネ１９に抗して押し開き油路１４を通つて
タンク２５に迅速に排出し、第１バネ１１によつ
て迅速に中立位置に復帰する。 In addition, the switching valve 23 is moved from the lowered position to the neutral position N.
When the second port 22 is returned to the tank 25 side, the pressure oil in the pressure receiving chamber 21 is transferred to the ball 1.
8 is pushed open against the spring 19 and quickly discharged into the tank 25 through the oil passage 14, and quickly returned to the neutral position by the first spring 11.
したがつて、切換弁２３を切換えてから油圧モ
ータ２６が外力によつて回転されることを極力防
止できると共に、キヤビテーシヨン発生を防止で
きる。 Therefore, it is possible to prevent the hydraulic motor 26 from being rotated by an external force after switching the switching valve 23, and also to prevent cavitation from occurring.
なお、実施例においては第２バネ１２によつて
もスプール９が中立復帰するから、より一層迅速
に中立位置に復帰する。 In the embodiment, the spool 9 is also returned to the neutral position by the second spring 12, so that the spool 9 is returned to the neutral position more quickly.
本考案は以上の様になり、スプール９を迅速に
中立位置に復帰させることができるカウンタバラ
ンス弁となる。 As described above, the present invention provides a counterbalance valve that can quickly return the spool 9 to the neutral position.
第１図は従来例の断面図、第２図は本考案の実
施例を示す全体断面図、第３図は要部拡大断面図
である。
１は弁本体、２1〜２4は第１〜第４ポート、９
はスプール、１１はバネ、２１は受圧室、２２は
細孔。
FIG. 1 is a sectional view of a conventional example, FIG. 2 is an overall sectional view showing an embodiment of the present invention, and FIG. 3 is an enlarged sectional view of a main part. 1 is the valve body, 2 1 to 2 4 are the first to fourth ports, 9
1 is a spool, 11 is a spring, 21 is a pressure receiving chamber, and 22 is a pore.
Claims (1)
１、第３ポート２1，２3を断通するスプール９並
びに第１、第３ポート２1，２3を短絡しかつ第３
ポート２3から第１ポート２1への流通を阻止する
逆止弁７を有する短路路６を設け、前記スプール
９を第１、第３ポート２1，２3を遮断する位置に
保持するバネ１１を設けると共に、そのバネ力に
抗する押力をスプール９に与える受圧室２１を形
成し、この受圧室２１を第２ポート２2より受圧
室２１への流路を阻止する逆止弁２０を介して第
２ポート２2に連通し、かつ前記スプール９に形
成した細孔２２を介して第２ポート２2に開口さ
せたことを特徴とするカウンタバランス弁。 The spool 9 that disconnects the first to fourth ports 2 1 to 2 4 and the first and third ports 2 1 and 2 3 and the first and third ports 2 1 and 2 3 are short-circuited to the valve body 1. Third
A short path 6 having a check valve 7 for blocking flow from the port 2 3 to the first port 2 1 is provided, and a spring holds the spool 9 in a position blocking the first and third ports 2 1 and 2 3 . 11, and a check valve 20 that forms a pressure receiving chamber 21 that applies a pushing force to the spool 9 that resists the spring force, and blocks the flow path of this pressure receiving chamber 21 from the second port 22 to the pressure receiving chamber 21. The counterbalance valve is characterized in that it communicates with the second port 2 2 through the spool 9 and opens into the second port 2 2 through the pore 22 formed in the spool 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15813783U JPS6065483U (en) | 1983-10-14 | 1983-10-14 | counterbalance valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15813783U JPS6065483U (en) | 1983-10-14 | 1983-10-14 | counterbalance valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6065483U JPS6065483U (en) | 1985-05-09 |
| JPH0213816Y2 true JPH0213816Y2 (en) | 1990-04-16 |
Family
ID=30348456
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15813783U Granted JPS6065483U (en) | 1983-10-14 | 1983-10-14 | counterbalance valve |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6065483U (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6831351B2 (en) * | 2018-06-28 | 2021-02-17 | オカダアイヨン株式会社 | Work machine attachments and hydraulically actuated valves for work machine attachments |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6128534U (en) * | 1984-07-24 | 1986-02-20 | 伸和工業株式会社 | manuscript table |
-
1983
- 1983-10-14 JP JP15813783U patent/JPS6065483U/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6128534U (en) * | 1984-07-24 | 1986-02-20 | 伸和工業株式会社 | manuscript table |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6065483U (en) | 1985-05-09 |
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