JPH05172110A - Load pressure detecting device for pressure-compensating hydraulic circuit - Google Patents
Load pressure detecting device for pressure-compensating hydraulic circuitInfo
- Publication number
- JPH05172110A JPH05172110A JP3355651A JP35565191A JPH05172110A JP H05172110 A JPH05172110 A JP H05172110A JP 3355651 A JP3355651 A JP 3355651A JP 35565191 A JP35565191 A JP 35565191A JP H05172110 A JPH05172110 A JP H05172110A
- Authority
- JP
- Japan
- Prior art keywords
- port
- spool
- load
- pressure
- actuator
- 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.)
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Landscapes
- Operation Control Of Excavators (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、１つの油圧ポンプの吐
出圧油を複数の油圧アクチュエータに供給する圧力補償
式油圧回路の負荷圧検出装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a load pressure detecting device for a pressure compensating hydraulic circuit that supplies the hydraulic fluid discharged from one hydraulic pump to a plurality of hydraulic actuators.
【０００２】[0002]
【従来の技術】１つの油圧ポンプの吐出圧油を複数の油
圧アクチュエータに供給するには、油圧ポンプの吐出路
に複数の操作弁を設け、その操作弁を切換えることで各
油圧アクチュエータに圧油を供給すれば良いが、このよ
うにすると複数の油圧アクチュエータに圧油を同時に供
給する際に、負荷の小さな油圧アクチュエータにのみ圧
油が供給されて負荷の大きな油圧アクチュエータに圧油
が供給されなくなってしまう。このことを解消する圧力
補償式油圧回路として、例えば特公平２−４９４０５号
公報に示すものが提案されている。2. Description of the Related Art In order to supply the discharge pressure oil of one hydraulic pump to a plurality of hydraulic actuators, a plurality of operation valves are provided in the discharge passage of the hydraulic pump, and the operation valves are switched to change the pressure oil to each hydraulic actuator. However, when supplying pressure oil to multiple hydraulic actuators at the same time, the pressure oil is supplied only to the hydraulic actuator with a small load and not to the hydraulic actuator with a large load. Will end up. As a pressure-compensated hydraulic circuit that solves this problem, for example, the one disclosed in Japanese Patent Publication No. 2-49405 has been proposed.
【０００３】かかる圧力補償式油圧回路を模式的に示す
と図１に示すようになる。つまり、油圧ポンプ１の吐出
路１ａに複数の操作弁２を設け、各操作弁２と各油圧ア
クチュエータ３を接続する回路４に圧力補償弁５をそれ
ぞれ設けると共に、各回路４の圧力、つまり負荷圧にお
ける最も高い圧力をチェック弁６で負荷圧検出路７に検
出し、その検出した負荷圧を各圧力補償弁５の受圧部５
ａに作用してその負荷圧に見合う圧力にセットし、各操
作弁２の出口側圧力を等しくして各操作弁２を同時操作
した時に各操作弁の開口面積に比例した分流比で各油圧
アクチュエータ３に圧油を供給できるようにしてある。The pressure-compensated hydraulic circuit is schematically shown in FIG. That is, a plurality of operating valves 2 are provided in the discharge passage 1a of the hydraulic pump 1, a pressure compensating valve 5 is provided in each circuit 4 connecting each operating valve 2 and each hydraulic actuator 3, and the pressure of each circuit 4, that is, the load. The highest pressure among the pressures is detected by the check valve 6 in the load pressure detection path 7, and the detected load pressure is detected by the pressure receiving portion 5 of each pressure compensation valve 5.
Acting on a, the pressure is set to a value commensurate with the load pressure, the pressures on the outlet side of the respective control valves 2 are made equal, and when the respective control valves 2 are operated simultaneously, the respective hydraulic pressures are divided in proportion to the opening area of the respective control valves. The pressure oil can be supplied to the actuator 3.
【０００４】かかる圧力補償式油圧回路であると、圧力
補償弁５の機能によって各油圧アクチュエータ３の負荷
の大小に無関係に操作弁２の開口面積に比例した流量分
配ができるから、１つの油圧ポンプ１の吐出圧油を操作
弁２の操作量に比例して各油圧アクチュエータ３にそれ
ぞれ供給できる。In such a pressure compensating hydraulic circuit, the function of the pressure compensating valve 5 allows the flow rate distribution to be proportional to the opening area of the operating valve 2 regardless of the load of each hydraulic actuator 3, so that one hydraulic pump is provided. One discharge pressure oil can be supplied to each hydraulic actuator 3 in proportion to the operation amount of the operation valve 2.
【０００５】本出願人は先に前述の圧力補償式油圧回路
における負荷圧を検出する装置としては図２、図３に示
すものを提案した。すなわち、図２、図３に示すように
弁本体１０のスプール孔１１の左右両側に一対の出力ポ
ート１２，１２と一対のポンプポート１３，１３と一対
のアクチュエータポート１４，１４と一対のタンクポー
ト１５，１５を形成し、かつスプール孔１１の左右中間
部に負荷圧検出ポート１６を形成し、この負荷圧検出ポ
ート１６をチェック弁１７で負荷圧検出路７となる負荷
圧検出孔１８に開口させ、前記スプール孔１１に嵌挿し
たスプール１９の左右両側に一対の第１小径部２０，２
０と一対の第２小径部２１，２１を形成して操作弁２と
し、前記出力ポート１２とアクチュエータポート１４を
圧力補償弁５で連通し、前記スプール１９に左右一対の
負荷圧検出孔２２，２２を形成し、その負荷圧検出孔２
２を第１ポート２３で第１小径部２０に開口し、第２ポ
ート２４で負荷圧検出ポート１６に開口し、ボール２５
を介して第３ポート２６でアクチュエータポート１４に
開口して、図３に示すようにスプール１９を操作位置と
すると一方の出力ポート１２の圧力が第１ポート２３、
負荷圧検出孔２２、第２ポート２４で負荷圧検出ポート
１６に負荷圧として流入するようにしている。The present applicant has previously proposed the device shown in FIGS. 2 and 3 as a device for detecting the load pressure in the above-mentioned pressure compensation type hydraulic circuit. That is, as shown in FIGS. 2 and 3, a pair of output ports 12 and 12, a pair of pump ports 13 and 13, a pair of actuator ports 14 and 14 and a pair of tank ports are provided on both left and right sides of the spool hole 11 of the valve body 10. 15 and 15, and a load pressure detection port 16 is formed in the left and right intermediate portion of the spool hole 11, and the load pressure detection port 16 is opened by a check valve 17 into a load pressure detection hole 18 which becomes the load pressure detection path 7. The pair of first small-diameter portions 20, 2 are provided on both left and right sides of the spool 19 fitted in the spool hole 11.
0 and a pair of second small-diameter portions 21 and 21 to form the operation valve 2, the output port 12 and the actuator port 14 are communicated with each other by the pressure compensation valve 5, and the spool 19 has a pair of left and right load pressure detection holes 22, 22 is formed and its load pressure detection hole 2
2 is opened at the first small diameter portion 20 at the first port 23, opened at the load pressure detection port 16 at the second port 24, and the ball 25
When the spool port 19 is opened to the operating position through the third port 26 via the first port 23 and the spool 19 is brought into the operating position as shown in FIG.
The load pressure detection hole 22 and the second port 24 are adapted to flow into the load pressure detection port 16 as load pressure.
【０００６】[0006]
【発明が解決しようとする課題】かかる構成であれば、
図３に示すようにスプール１９の操作ストロークが小さ
い時に負荷圧検出ポート１６に流入した負荷圧の一部が
環状溝２７、溝２７ａ、反対側の第２ポート２４、負荷
圧検出孔２２、ボール２５、ドレーンポート２８より反
対側のタンクポート１５に流出するので、検出した負荷
圧が出力ポート１２の圧力より減圧され、油圧ポンプの
吐出流量を自己のポンプ圧力によって減少するために操
作弁２の微操作域でのショックを防止できる。すなわ
ち、油圧ポンプ１の吐出流量はポンプ吐出圧を利用して
ポンプ吐出圧と負荷圧の差圧が一定となるように制御し
ており、負荷圧が低くなれば吐出流量が減少するので、
負荷圧を減圧することで吐出流量を減少できる。しかし
ながら、スプール１９を図２に示す中立位置とした時に
油圧アクチュエータ３の保持圧によるアクチュエータポ
ート１４の圧油が矢印で示すようにスプール孔１１とス
プール１９との隙間からポンプポート１３とタンクポー
ト１５に漏れるし、第３ポート２６からも矢印で示すよ
うにドレーンポート２８を経てタンクポート１５に漏れ
るので、油圧アクチュエータ３の保持圧側の圧油が流出
して油圧アクチュエータ３が外力で動くことがある。With such a configuration,
As shown in FIG. 3, when the operation stroke of the spool 19 is small, part of the load pressure that has flowed into the load pressure detection port 16 is the annular groove 27, the groove 27a, the second port 24 on the opposite side, the load pressure detection hole 22, and the ball. 25, the detected load pressure is reduced from the pressure of the output port 12 because it flows out to the tank port 15 on the opposite side of the drain port 28, and the discharge flow rate of the hydraulic pump is reduced by its own pump pressure. It is possible to prevent shock in the fine control range. That is, the discharge flow rate of the hydraulic pump 1 is controlled using the pump discharge pressure so that the differential pressure between the pump discharge pressure and the load pressure becomes constant, and the discharge flow rate decreases as the load pressure decreases.
The discharge flow rate can be reduced by reducing the load pressure. However, when the spool 19 is set to the neutral position shown in FIG. 2, the pressure oil of the actuator port 14 due to the holding pressure of the hydraulic actuator 3 moves from the gap between the spool hole 11 and the spool 19 to the pump port 13 and the tank port 15 as shown by the arrow. And the third port 26 also leaks to the tank port 15 via the drain port 28 as shown by the arrow, so that the pressure oil on the holding pressure side of the hydraulic actuator 3 may flow out and the hydraulic actuator 3 may move by an external force. ..
【０００７】そこで、本発明は前述の課題を解決できる
ようにした圧力補償式油圧回路の負荷圧検出装置を提供
することを目的とする。SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a load pressure detecting device for a pressure compensating hydraulic circuit which can solve the above-mentioned problems.
【０００８】[0008]
【課題を解決するための手段】弁本体１０のスプール孔
１１の左右両側に出力ポート１２、ポンプポート１３、
アクチュエータポート１４、タンクポート１５をそれぞ
れ形成し、このスプール孔１１に嵌挿したスプール１９
の左右両側に第１・第２小径部２０，２１をそれぞれ形
成した前記操作弁２とし、前記スプール孔１１の左右中
間部に負荷圧検出ポート１６を形成し、前記スプール１
９の左右に負荷圧検出孔２２をそれぞれ形成し、この各
負荷圧検出孔２２を第１ポート２３で第１小径部２０に
開口し、かつ第２ポート２４で負荷圧検出ポート１６に
開口し、ボール２５を経て第３ポート２６でアクチュエ
ータポート１４に開口し、前記左右の第２ポート２４を
スプール１９が左右に微ストローク移動した時に負荷圧
検出ポート１６に開口するようにし、前記スプール１９
の第３ポート２６が開口した外周面を小径としてスプー
ル孔１１との間にアクチュエータポート１４に開口した
隙間３０を構成して成る圧力補償式油圧回路の負荷圧検
出装置。[MEANS FOR SOLVING THE PROBLEMS] The output port 12, the pump port 13, and the left and right sides of the spool hole 11 of the valve body 10,
The spool 19 is formed by inserting the actuator port 14 and the tank port 15 into the spool hole 11.
The first and second small diameter portions 20 and 21 are formed on both the left and right sides of the spool valve 11, and the load pressure detection port 16 is formed in the middle portion of the spool hole 11 on the left and right sides.
9. Load pressure detection holes 22 are formed on the left and right sides of 9, respectively, and the respective load pressure detection holes 22 are opened at the first small diameter portion 20 at the first port 23 and at the load pressure detection port 16 at the second port 24. Through the ball 25, the third port 26 opens to the actuator port 14, and the left and right second ports 24 open to the load pressure detection port 16 when the spool 19 makes a slight stroke left and right movement.
The load pressure detecting device for the pressure compensating hydraulic circuit, in which the outer peripheral surface having the third port 26 opened has a small diameter to form a gap 30 opening to the actuator port 14 between the third hole 26 and the spool hole 11.
【０００９】[0009]
【作 用】スプール１９の操作ストロークが小さい時
には負荷圧検出ポート１６に検出した負荷圧が第３ポー
ト２６、隙間３０よりアクチュエータポート１４に流出
し、そのアクチュエータポート１４からタンクポート１
５に流出するので負荷圧が減圧され、操作弁２の微操作
域でのショックを低減できるし、スプール１９が中立位
置の時にはアクチュエータポート１４内の圧油がスプー
ル孔１１とスプール１９との隙間からポンプポート１
３、タンクポート１４に漏れるだけであって油圧アクチ
ュエータ３が外力で作動することを低減できる。[Operation] When the operating stroke of the spool 19 is small, the load pressure detected by the load pressure detection port 16 flows out to the actuator port 14 through the third port 26 and the gap 30, and the actuator port 14 causes the tank port 1
5, the load pressure is reduced, and the shock in the fine operation range of the operation valve 2 can be reduced. When the spool 19 is in the neutral position, the pressure oil in the actuator port 14 causes a gap between the spool hole 11 and the spool 19. From pump port 1
3. The hydraulic actuator 3 can be prevented from being operated by an external force only by leaking to the tank port 14.
【００１０】[0010]
【実 施 例】本発明の実施例を図４、図５を参照して
説明する。なお、従来と同一部材は符号を同一とする。
スプール１９における第３ポート２６が開口した外周面
における第２小径部２１寄りを小径としてスプール孔１
１との間にアクチュエータポート１４に開口した隙間３
０を構成する。これにより、スプール１９を図５に示す
ように操作した時に検出した負荷圧の一部が隙間３０を
経てアクチュエータポート１４に流出し、そのアクチュ
エータポート１４から第２小径部２１を経てタンクポー
ト１５に流出するので、負荷圧を減圧できる。また、ス
プール１９を図４に示す中立位置とした時にはアクチュ
エータポート１４内の圧油は矢印で示すようにスプール
孔１１とスプール１９との隙間からタンクポート１３と
タンクポート１５に漏れるが、第３ポート２６に流入し
た圧油は漏れることがなく、アクチュエータポート１４
内の圧油漏れ流量が減少する。EXAMPLES Examples of the present invention will be described with reference to FIGS. It should be noted that the same members as those in the conventional art have the same reference numerals.
The spool hole 1 has a small diameter near the second small diameter portion 21 on the outer peripheral surface of the spool 19 where the third port 26 is opened.
1 and the gap 3 opened to the actuator port 14
Configure 0. As a result, a part of the load pressure detected when the spool 19 is operated as shown in FIG. 5 flows out to the actuator port 14 through the gap 30, and then from the actuator port 14 to the tank port 15 via the second small diameter portion 21. Since it flows out, the load pressure can be reduced. Further, when the spool 19 is set to the neutral position shown in FIG. 4, the pressure oil in the actuator port 14 leaks from the gap between the spool hole 11 and the spool 19 to the tank port 13 and the tank port 15 as shown by the arrow. The pressure oil that has flowed into the port 26 does not leak, and the actuator port 14
The flow rate of pressure oil leakage inside is reduced.
【００１１】[0011]
【発明の効果】スプール１９の操作ストロークが小さい
時には負荷圧検出ポート１６に検出した負荷圧が第３ポ
ート２６、隙間３０よりアクチュエータポート１４に流
出し、そのアクチュエータポート１４からタンクポート
１５に流出するので負荷圧が減圧され、操作弁２の微操
作域でのショックを低減できるし、スプール１９が中立
位置の時にはアクチュエータポート１４内の圧油がスプ
ール孔１１とスプール１９との隙間からポンプポート１
３、タンクポート１４に漏れるだけであって油圧アクチ
ュエータ３が外力で作動することを低減できる。When the operation stroke of the spool 19 is small, the load pressure detected by the load pressure detecting port 16 flows out to the actuator port 14 through the third port 26 and the gap 30, and then to the tank port 15 from the actuator port 14. Therefore, the load pressure is reduced, and the shock in the fine operation range of the operation valve 2 can be reduced, and when the spool 19 is in the neutral position, the pressure oil in the actuator port 14 flows from the gap between the spool hole 11 and the spool 19 into the pump port 1
3. The hydraulic actuator 3 can be prevented from being operated by an external force only by leaking to the tank port 14.
【図１】油圧回路図である。FIG. 1 is a hydraulic circuit diagram.
【図２】従来例の中立状態の断面図である。FIG. 2 is a cross-sectional view of a conventional example in a neutral state.
【図３】従来例の操作状態の断面図である。FIG. 3 is a sectional view of a conventional example in an operating state.
【図４】本発明の実施例を示す中立状態の断面図であ
る。FIG. 4 is a sectional view in a neutral state showing an embodiment of the present invention.
【図５】本発明の実施例を示す操作状態の断面図であ
る。FIG. 5 is a sectional view of an operating state showing an embodiment of the present invention.
１…油圧ポンプ、１ａ…吐出路、２…操作弁、３…油圧
アクチュエータ、４…回路、５…圧力補償弁、７…負荷
圧検出路、１０…弁本体、１１…スプール孔、１２…出
力ポート、１３…タンクポート、１４…アクチュエータ
ポート、１５…タンクポート、１６…負荷圧検出ポー
ト、１９…スプール、２０…第１小径部、２１…第２小
径部、２３…負荷圧検出孔、２３…第１ポート、２４…
第２ポート、２５…ボール、２６…第３ポート、３０…
隙間。DESCRIPTION OF SYMBOLS 1 ... Hydraulic pump, 1a ... Discharge path, 2 ... Operation valve, 3 ... Hydraulic actuator, 4 ... Circuit, 5 ... Pressure compensation valve, 7 ... Load pressure detection path, 10 ... Valve main body, 11 ... Spool hole, 12 ... Output Port, 13 ... Tank port, 14 ... Actuator port, 15 ... Tank port, 16 ... Load pressure detecting port, 19 ... Spool, 20 ... First small diameter portion, 21 ... Second small diameter portion, 23 ... Load pressure detecting hole, 23 … First port, 24…
2nd port, 25 ... ball, 26 ... 3rd port, 30 ...
Gap.
Claims (1)
弁２を設け、各操作弁２と油圧アクチュエータ３を接続
する回路４に圧力補償弁５をそれぞれ設け、前記各油圧
アクチュエータ３の負荷圧の最高圧を検出する負荷圧検
出路７を前記各圧力補償弁５の受圧部５ａに接続した圧
力補償式油圧回路において、 弁本体１０のスプール孔１１の左右両側に出力ポート１
２、ポンプポート１３、アクチュエータポート１４、タ
ンクポート１５をそれぞれ形成し、このスプール孔１１
に嵌挿したスプール１９の左右両側に第１・第２小径部
２０，２１をそれぞれ形成した前記操作弁２とし、 前記スプール孔１１の左右中間部に負荷圧検出ポート１
６を形成し、前記スプール１９の左右に負荷圧検出孔２
０をそれぞれ形成し、この各負荷圧検出孔２２を第１ポ
ート２３で第１小径部２３に開口し、かつ第２ポート２
４で負荷圧検出ポート１６に開口し、ボール２５を経て
第３ポート２６でアクチュエータポート１４に開口し、 前記左右の第２ポート２４をスプール１９が左右に微ス
トローク移動した時に負荷圧検出ポート１６に開口する
ようにし、前記スプール１９の第３ポート２６が開口し
た外周面を小径としてスプール孔１１との間にアクチュ
エータポート１４に開口した隙間３０を構成して成る圧
力補償式油圧回路の負荷圧検出装置。1. A plurality of operating valves 2 are provided in a discharge passage 1a of a hydraulic pump 1, a pressure compensating valve 5 is provided in a circuit 4 connecting each operating valve 2 and a hydraulic actuator 3, and a load of each hydraulic actuator 3 is provided. In the pressure compensating hydraulic circuit in which the load pressure detecting path 7 for detecting the maximum pressure is connected to the pressure receiving portion 5a of each of the pressure compensating valves 5, the output port 1 is provided on both left and right sides of the spool hole 11 of the valve body 10.
2, a pump port 13, an actuator port 14, and a tank port 15 are formed respectively, and the spool hole 11
The first and second small diameter portions 20 and 21 are formed on both left and right sides of the spool 19 fitted in the operation valve 2, and the load pressure detection port 1 is provided at the left and right intermediate portion of the spool hole 11.
6 are formed, and the load pressure detection holes 2 are formed on the left and right of the spool 19.
0 are formed respectively, and the respective load pressure detection holes 22 are opened at the first small diameter portion 23 at the first port 23, and the second port 2 is formed.
4 is opened to the load pressure detection port 16 and the ball 25 is opened to the third port 26 to the actuator port 14, and the left and right second ports 24 are moved to the left and right by a slight stroke. Of the spool 19, and the outer peripheral surface of the spool 19 in which the third port 26 is open has a small diameter to form a gap 30 open to the actuator port 14 between the spool 19 and the load port of the pressure compensating hydraulic circuit. Detection device.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3355651A JPH05172110A (en) | 1991-12-24 | 1991-12-24 | Load pressure detecting device for pressure-compensating hydraulic circuit |
| US08/244,439 US5481872A (en) | 1991-11-25 | 1992-11-25 | Hydraulic circuit for operating plural actuators and its pressure compensating valve and maximum load pressure detector |
| PCT/JP1992/001540 WO1993011364A1 (en) | 1991-11-25 | 1992-11-25 | Hydraulic circuit for operating plural actuators and its pressure compensating valve and maximum load pressure detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3355651A JPH05172110A (en) | 1991-12-24 | 1991-12-24 | Load pressure detecting device for pressure-compensating hydraulic circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05172110A true JPH05172110A (en) | 1993-07-09 |
Family
ID=18445069
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3355651A Pending JPH05172110A (en) | 1991-11-25 | 1991-12-24 | Load pressure detecting device for pressure-compensating hydraulic circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05172110A (en) |
-
1991
- 1991-12-24 JP JP3355651A patent/JPH05172110A/en active Pending
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