JPH10267009A - Load hold switching valve device - Google Patents
Load hold switching valve deviceInfo
- Publication number
- JPH10267009A JPH10267009A JP7236797A JP7236797A JPH10267009A JP H10267009 A JPH10267009 A JP H10267009A JP 7236797 A JP7236797 A JP 7236797A JP 7236797 A JP7236797 A JP 7236797A JP H10267009 A JPH10267009 A JP H10267009A
- Authority
- JP
- Japan
- Prior art keywords
- valve
- switching
- load holding
- oil
- pilot
- 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
Landscapes
- Fluid-Pressure Circuits (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、建設機械等のアク
チュエータ油圧回路に係り、特に前記油圧回路において
アクチュエータ負荷を一時的に保持する負荷保持切換弁
装置に関する。The present invention relates to an actuator hydraulic circuit for a construction machine or the like, and more particularly to a load holding switching valve device for temporarily holding an actuator load in the hydraulic circuit.
【０００２】[0002]
【従来の技術】一般に、この種の負荷保持切換弁装置
は、図３に示すように、アクチュエータ３に対して、油
圧ポンプ５、ポンプ油路６からの作動圧油を、一対の給
排油路７、８を介して交互に給排する方向切換弁２０
と、アクチュエータ３からの排出油を一時的に遮断保持
するよう前記一対の給排油路７、８の中のアクチュエー
タ負荷４側の排出油路８内に配置される負荷保持弁すな
わちチェック弁３０とから形成されている。2. Description of the Related Art Generally, as shown in FIG. 3, this type of load holding switching valve device supplies a hydraulic pump 5 and a hydraulic oil from a pump oil passage 6 to a pair of supply and discharge oils to an actuator 3. Directional switching valve 20 for alternately supplying and discharging via paths 7 and 8
A load holding valve, that is, a check valve 30 disposed in the discharge oil passage 8 on the side of the actuator load 4 in the pair of supply and discharge oil passages 7 and 8 so as to temporarily shut off and hold the discharge oil from the actuator 3 And is formed from
【０００３】そして、前記方向切換弁２０および負荷保
持弁３０は、それぞれの油圧源１１、１２から導入され
る方向切換弁用パイロット圧ｐa および負荷保持弁用パ
イロット圧ｐb で操作される切換スプールおよび開閉手
段すなわちパイロットチェック弁４０を有している。The direction switching valve 20 and the load holding valve 30 are provided with a switching spool operated by a direction switching valve pilot pressure pa and a load holding valve pilot pressure pb introduced from respective hydraulic pressure sources 11 and 12. An opening / closing means, that is, a pilot check valve 40 is provided.
【０００４】このように構成された負荷保持弁３０およ
び方向切換弁２０は、それぞれ連動的に開成および切換
えられることにより、前記保持排出油を、前記排出油路
８およびタンク油路９からタンク１０内へ開放排出する
ように構成されている。The load holding valve 30 and the direction switching valve 20 configured as described above are opened and switched in an interlocking manner, so that the held discharge oil is discharged from the discharge oil passage 8 and the tank oil passage 9 to the tank 10. It is configured to be discharged into the inside.
【０００５】なお、図示の装置において、負荷保持弁３
０の方向切換弁２０に対する連動、つまり負荷保持弁３
０を作動するパイロットチェック弁４０の方向切換弁２
０の切換スプールに対する連動は、パイロットチェック
弁４０が、方向切換弁用パイロット圧ｐa で作動するパ
イロット切換弁４１を介して作動することにより達成さ
れるように構成される。また、負荷保持弁３０の開成
は、スプリング３１を備えるスプリング室３２内の圧油
が、パイロットチェック弁４０を介して排出され、そし
て絞り３３の前後に差圧が発生することにより達成され
るように構成されている。In the illustrated device, the load holding valve 3
0, that is, the load holding valve 3
Directional control valve 2 of pilot check valve 40 that operates 0
The interlocking with respect to the switching spool of 0 is configured to be achieved by operating the pilot check valve 40 via the pilot switching valve 41 which operates at the pilot pressure pa for the direction switching valve. Further, the opening of the load holding valve 30 is achieved by releasing the pressure oil in the spring chamber 32 having the spring 31 through the pilot check valve 40 and generating a differential pressure across the throttle 33. Is configured.
【０００６】従って、このような負荷保持切換弁装置に
よれば、負荷をアクチュエータで一時的に保持した状態
すなわち方向切換弁の図示の中立時において、仮に方向
切換弁に圧油漏れが発生しても、これによる前記負荷の
自然落下を防止することができる負荷の自然落下防止機
能を発揮させることができる。Therefore, according to such a load holding switching valve device, when the load is temporarily held by the actuator, that is, when the directional switching valve is in the neutral position in the drawing, pressure oil leaks temporarily to the directional switching valve. In addition, the function of preventing the load from naturally dropping can be exhibited.
【０００７】[0007]
【発明が解決しようとする課題】しかしながら、前述し
た従来の負荷保持切換弁装置においては、なお次に述べ
るような難点があった。However, the conventional load holding switching valve device described above still has the following disadvantages.
【０００８】すなわち、負荷保持切換弁装置における、
負荷の自然落下防止機能は、負荷保持弁および方向切換
弁の連動的な開成および切換え作動によって達成され、
前記両弁の連動は、負荷保持弁を作動するパイロットチ
ェック弁を、方向切換弁用のパイロット圧で作動するパ
イロット切換弁で作動することによって達成されるよう
に構成されている。That is, in the load holding switching valve device,
The load natural fall prevention function is achieved by the interlocking opening and switching operation of the load holding valve and the directional switching valve,
The interlocking of the two valves is achieved by operating a pilot check valve that operates a load holding valve with a pilot switching valve that operates with pilot pressure for a direction switching valve.
【０００９】このため、従来のこのような型式の両弁の
連動システムにおいては、先ず第１に、連動タイミング
が両弁の開成および切換の異なるタイミングによって規
制される結果、両タイミングの間に不整合を生じてアク
チュエータの駆動操作性が往々にして低下し、次いで第
２には、方向切換弁用のパイロット圧油が負荷保持弁用
のパイロット圧油にも兼用されている結果、弁体３に対
して設計によっては省略されるべき余分な外部ポートＰ
a 、Ｐb および外部配管Ｌa 、Ｌb が必要となり、構造
が全体的に複雑かつ大型化していた。For this reason, in such a conventional two-valve interlocking system, firstly, the interlocking timing is regulated by different timings of opening and switching of the two valves. Secondly, the driving operability of the actuator is reduced due to the alignment, and secondly, the pilot pressure oil for the direction switching valve is also used as the pilot pressure oil for the load holding valve. Extra external port P to be omitted depending on the design
a, Pb and external piping La, Lb were required, and the structure was complicated and large as a whole.
【００１０】そこで、本発明の目的は、負荷保持弁およ
び方向切換弁の連動タイミングを適切に規制してアクチ
ュエータの操作性を向上すると共に、構造を簡単かつ小
型化することができる負荷保持切換弁装置を提供するこ
とにある。SUMMARY OF THE INVENTION An object of the present invention is to provide a load holding switching valve capable of improving the operability of an actuator by appropriately regulating the interlocking timing of a load holding valve and a direction switching valve, and having a simple and compact structure. It is to provide a device.
【００１１】[0011]
【課題を解決するための手段】先の目的を達成するため
に、本発明に係る負荷保持切換弁装置は、アクチュエー
タに対して作動圧油を一対の給排油路を介して交互に給
排する方向切換弁と、前記アクチュエータからの排出油
を一時的に遮断保持するよう前記一対の給排油路の中の
アクチュエータ負荷側の排出油路内に配置される負荷保
持弁とからなり、前記方向切換弁および負荷保持弁は、
それぞれ方向切換弁用および負荷保持弁用のパイロット
圧で操作する切換スプールおよび開閉手段を有し、前記
負荷保持弁および方向切換弁がそれぞれ連動的に開成お
よび切換えることによって前記保持排出油を開放するよ
う構成してなる負荷保持切換弁装置において、前記開閉
手段は、負荷保持弁用パイロット圧で作動して負荷保持
弁を開閉するパイロット操作弁と、前記負荷保持弁用パ
イロット圧を方向切換弁用パイロット圧に同期させるパ
イロット圧同期手段とから構成することを特徴とする。In order to achieve the above object, a load holding switching valve apparatus according to the present invention alternately supplies and discharges operating pressure oil to and from an actuator via a pair of oil supply and discharge passages. A directional switching valve, and a load holding valve disposed in a discharge oil passage on the actuator load side of the pair of supply and discharge oil passages to temporarily shut off and hold the discharge oil from the actuator, The direction switching valve and the load holding valve are
It has a switching spool and an opening / closing means respectively operated by pilot pressures for the direction switching valve and the load holding valve, and the load holding valve and the direction switching valve are opened and switched in conjunction with each other to release the held discharge oil. In the load holding switching valve device configured as described above, the opening / closing means includes a pilot operating valve that operates with the load holding valve pilot pressure to open and close the load holding valve, and a pilot pressure for the load holding valve for the direction switching valve. And a pilot pressure synchronizing means for synchronizing with the pilot pressure.
【００１２】この場合、前記パイロット操作弁は、負荷
保持弁の内部圧油を排出することにより当該弁を開成す
るパイロットチェック弁から形成し、一方パイロット圧
同期手段は、前記パイロットチェック弁を開閉作動する
開閉ピストンと、この開閉ピストンを切換スプールの方
向切換弁の切換えに同期して作動させるタイミング機構
とから形成することができる。In this case, the pilot operation valve is formed of a pilot check valve that opens the valve by discharging the internal pressure oil of the load holding valve, while the pilot pressure synchronization means opens and closes the pilot check valve. And a timing mechanism for operating the opening / closing piston in synchronization with the switching of the direction switching valve of the switching spool.
【００１３】また、前記タイミング機構は、負荷保持弁
用パイロット圧油を開閉ピストンの前後シリンダ室へ給
排した後に方向切換弁のタンク通路と連通するよう弁体
内に設けたパイロット圧給排油路と、この給排油路と交
叉連通する切換スプールの切換位置部であって方向切換
弁用パイロット圧による切換スプールの切換え動作に際
してその方向切換弁の切換え動作に少なくとも先行して
前記負荷保持弁用パイロット圧油の供給油路を連通する
と共に排出油路を前記タンク通路へ連通するタイミング
切換位置部とから形成することができる。The timing mechanism includes a pilot pressure supply / discharge oil passage provided in the valve body so as to communicate with the tank passage of the direction switching valve after supplying / discharging the pilot pressure oil for the load holding valve to the front / rear cylinder chamber of the opening / closing piston. At the switching position of the switching spool cross-communicating with the oil supply / discharge passage, and at the time of switching operation of the switching spool by the pilot pressure for the direction switching valve, at least prior to the switching operation of the direction switching valve, And a timing switching position for communicating a supply oil passage for pilot pressure oil and a discharge oil passage to the tank passage.
【００１４】このように、本発明の負荷保持切換弁装置
によれば、負荷保持弁および方向切換弁を連動して開成
および切換えるタイミングが、前記両弁用のパイロット
圧同期手段すなわち切換スプールのタイミング切換位置
部を介して、負荷保持弁の開成が方向切換弁の切換え操
作に適宜先行するよう適切に達成されると共に、パイロ
ット圧油に関する従来必要とされていた余分の外部ポー
トおよび外部配管が弁体内に収納されて不必要となる。
すなわち、アクチュエータの操作性を向上し得ると共に
構造を簡単かつ小型化することができる。As described above, according to the load holding switching valve apparatus of the present invention, the timing for opening and switching the load holding valve and the direction switching valve in conjunction with each other is determined by the pilot pressure synchronization means for both valves, that is, the timing of the switching spool. Via the switching position, the opening of the load holding valve is appropriately achieved so as to precede the switching operation of the directional switching valve, and the extra external ports and external piping conventionally required for pilot pressure oil are provided by the valve. It is stored in the body and becomes unnecessary.
That is, the operability of the actuator can be improved, and the structure can be simplified and reduced in size.
【００１５】[0015]
【実施例】次に、本発明に係る負荷保持切換弁装置の実
施例につき、添付図面を参照しながら以下詳細に説明す
る。なお、説明の便宜上、図３に示す従来の構造と同一
の構成部分には同一の参照符号を付し、詳細な説明は省
略する。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of a load holding switching valve device according to the present invention. For convenience of description, the same components as those of the conventional structure shown in FIG. 3 are denoted by the same reference numerals, and detailed description is omitted.
【００１６】先ず初めに、図１は従来の図３に対応する
油圧回路図であり、図２は全体構造図を示すものであっ
て、本発明に係る負荷保持切換弁装置の基本的構成は、
前記従来の構成と同一である。従って、一部重複する
が、理解を容易にするため、再び簡単に説明すると、本
発明の弁装置１は、アクチュエータ３に対して、油圧ポ
ンプ５、ポンプ油路６からの作動圧油を、一対の給排油
路７、８を介して交互に給排する方向切換弁２０と、ア
クチュエータ３からの排出油を一時的に遮断保持するよ
うに前記一対の給排油路７、８の中のアクチュエータ負
荷４側の排出油路８内に配置される負荷保持チェック弁
３０とから形成されている。First, FIG. 1 is a hydraulic circuit diagram corresponding to FIG. 3 of the related art, and FIG. 2 is an overall structural diagram. The basic configuration of a load holding switching valve device according to the present invention is as follows. ,
This is the same as the conventional configuration. Therefore, although partially overlapped, in order to facilitate understanding, to briefly explain again, the valve device 1 according to the present invention uses the hydraulic pressure from the hydraulic pump 5 and the pump oil passage 6 for the actuator 3. A direction switching valve 20 for alternately supplying and discharging the oil via the pair of oil supply / discharge passages 7 and 8, and a pair of supply / discharge oil passages 7 and 8 for temporarily stopping and holding the discharge oil from the actuator 3 And a load holding check valve 30 disposed in the discharge oil passage 8 on the side of the actuator load 4.
【００１７】そして、方向切換弁２０および負荷保持弁
３０は、それぞれの油圧源１１、１２から導入される方
向切換弁用パイロット圧ｐa および負荷保持弁用パイロ
ット圧ｐb で操作される切換スプール２１（図２）およ
び開閉手段５０を有している。The directional control valve 20 and the load holding valve 30 are operated by the directional control valve pilot pressure pa and the load holding valve pilot pressure pb introduced from the hydraulic pressure sources 11 and 12, respectively. 2) and opening / closing means 50.
【００１８】このようにして、負荷保持弁３０および方
向切換弁２０が、それぞれ連動的に開成および切換えら
れることにより、保持排出油を前記排出油路８およびタ
ンク油路９からタンク１０内へ開放排出するように構成
されている。なお、図示の状態は、負荷保持弁３０が閉
成され、方向切換弁２０が中立位置に保持された負荷保
持状態を示している。As described above, the load holding valve 30 and the direction switching valve 20 are opened and switched in conjunction with each other, so that the held discharge oil is released from the discharge oil passage 8 and the tank oil passage 9 into the tank 10. It is configured to discharge. The illustrated state shows a load holding state in which the load holding valve 30 is closed and the direction switching valve 20 is held at the neutral position.
【００１９】しかるに、本発明に係る負荷保持切換弁装
置において、負荷保持弁３０に対する前記開閉手段５０
は、負荷保持弁用パイロット圧ｐb で作動して負荷保持
弁３０を開閉するパイロット操作弁５１と、負荷保持弁
用パイロット圧ｐb を方向切換弁用パイロット圧ｐa に
同期させるパイロット圧同期手段５２とから構成され
る。However, in the load holding switching valve device according to the present invention, the opening / closing means 50 for the load holding valve 30 is provided.
A pilot operating valve 51 which operates with the load holding valve pilot pressure pb to open and close the load holding valve 30; a pilot pressure synchronizing means 52 for synchronizing the load holding valve pilot pressure pb with the direction switching valve pilot pressure pa; Consists of
【００２０】このパイロット操作弁５１は、好適には、
負荷保持弁３０のスプリング３１を備えたスプリング室
３２が、油路５９およびチェック弁６０を介して方向切
換弁２０の供給通路２３に連通して、このスプリング室
３２内の圧油を排出して、その絞り３３の前後に差圧を
発生させることにより、負荷保持弁３０を開成するパイ
ロットチェック弁５１から形成する。一方、パイロット
圧同期手段５２は、前記パイロットチェック弁５１を開
閉作動する開閉ピストン５３と、この開閉ピストン５３
を切換スプール２１の方向切換弁２０の切換えに同期し
て作動させるタイミング機構５４とから形成することが
できる。This pilot operated valve 51 is preferably
A spring chamber 32 provided with a spring 31 of the load holding valve 30 communicates with the supply passage 23 of the direction switching valve 20 via an oil passage 59 and a check valve 60 to discharge the pressure oil in the spring chamber 32. The load holding valve 30 is opened by generating a differential pressure across the throttle 33 to form a pilot check valve 51. On the other hand, the pilot pressure synchronizing means 52 includes an opening / closing piston 53 for opening and closing the pilot check valve 51, and an opening / closing piston 53
And a timing mechanism 54 that operates in synchronization with the switching of the direction switching valve 20 of the switching spool 21.
【００２１】すなわち、タイミング機構５４は、負荷保
持弁用パイロット圧油ｐb を開閉ピストン５３の前後シ
リンダ室６１、６２へ給排した後に、方向切換弁２０の
タンク通路２２へ連通するよう弁体２内に設けたパイロ
ット圧給排油路５５、５６と、この給排油路５５、５６
と交叉連通する切換スプール２１の切換位置部５７、５
８であって、方向切換弁用パイロット圧ｐa による切換
スプール２１の切換え動作に際しその方向切換弁２０の
切換え動作に少なくとも先行して、負荷保持弁用パイロ
ット圧油ｐb の供給油路５５をその油圧源１２に連通す
ると共に、排出油路５６を前記タンク通路２２へ連通す
るタイミング切換位置部５７、５８とから形成されてい
る。That is, the timing mechanism 54 supplies and discharges the pilot pressure oil pb for the load holding valve to the front and rear cylinder chambers 61 and 62 of the open / close piston 53, and then communicates with the tank passage 22 of the direction switching valve 20. The pilot pressure supply / discharge oil passages 55, 56 provided in the
Switching positions 57, 5
8, at least prior to the switching operation of the directional control valve 20 at the time of the switching operation of the switching spool 21 by the directional control valve pilot pressure pa, the supply oil passage 55 of the load holding valve pilot pressure oil pb It is formed from timing switching positions 57 and 58 that communicate with the source 12 and also communicate the discharge oil passage 56 with the tank passage 22.
【００２２】従って、本発明の負荷保持切換弁装置によ
れば、負荷保持弁および方向切換弁の連動する開成およ
び切換えタイミングが、切換スプールのタイミング切換
位置部の関係位置を適宜選定することにより、前記両弁
用のパイロット圧同期手段を介して、負荷保持弁の開成
を方向切換弁の切換に適宜に先行するよう適切に達成す
ることができると共に、パイロット圧油に関する従来必
要とされていた余分の外部ポートおよび外部配管が弁対
内に収納されて不必要となる。すなわち、アクチュエー
タの操作性を向上し得ると共に、構造を簡単かつ小型に
構成することが可能となる。Therefore, according to the load holding switching valve device of the present invention, the interlocking opening and switching timing of the load holding valve and the directional switching valve is determined by appropriately selecting the relative position of the timing switching position of the switching spool. Through the pilot pressure synchronizing means for both valves, the opening of the load holding valve can be appropriately achieved so as to appropriately precede the switching of the directional control valve, and the excess conventionally required for pilot pressure oil is provided. The external port and the external piping are housed in the valve pair and become unnecessary. That is, the operability of the actuator can be improved, and the structure can be simple and small.
【００２３】以上、本発明の好適な実施例について説明
したが、本発明は前記実施例に限定されることなく、そ
の精神を逸脱しない範囲内において多くの設計変更が可
能である。Although the preferred embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and many design changes can be made without departing from the spirit of the present invention.
【００２４】[0024]
【発明の効果】以上説明したように、本発明に係る負荷
保持切換弁装置は、アクチュエータに対して作動圧油を
一対の給排油路を介して交互に給排する方向切換弁と、
前記アクチュエータからの排出油を一時的に遮断保持す
るよう前記一対の給排油路の中のアクチュエータ負荷側
の排出油路内に配置される負荷保持弁とからなり、前記
方向切換弁および負荷保持弁は、それぞれ方向切換弁用
および負荷保持弁用のパイロット圧で操作する切換スプ
ールおよび開閉手段を有し、前記負荷保持弁および方向
切換弁がそれぞれ連動的に開成および切換えることによ
って前記保持排出油を開放するよう構成してなる負荷保
持切換弁装置において、前記開閉手段は、負荷保持弁用
パイロット圧で作動して負荷保持弁を開閉するパイロッ
ト操作弁と、前記負荷保持弁用パイロット圧を方向切換
弁用パイロット圧に同期させるパイロット圧同期手段と
から構成したことにより、負荷保持弁および方向切換弁
の連動する開成および切換えタイミングが、前記両弁用
のパイロット圧同期手段すなわち切換スプールのタイミ
ング切換位置部を介して、負荷保持弁の開成が方向切換
弁の切換えに適宜先行するよう適切に達成されると共
に、パイロット圧油に関する従来必要とされていた外部
ポートおよび外部配管が弁対内に収納されて不必要とな
る。すなわち、アクチュエータの操作性を向上し得ると
共に構造を簡単かつ小型に構成することが可能となる。As described above, the load holding switching valve device according to the present invention comprises: a direction switching valve for alternately supplying and discharging working pressure oil to and from the actuator through a pair of supply and discharge oil passages;
A load holding valve arranged in a discharge oil passage on the actuator load side of the pair of supply / discharge oil passages to temporarily shut off and hold the oil discharged from the actuator, the direction switching valve and the load holding The valve has a switching spool and opening / closing means which are operated by pilot pressures for the direction switching valve and the load holding valve, respectively. Wherein the opening / closing means is operated by a load holding valve pilot pressure to open / close the load holding valve, and a direction of the pilot pressure for the load holding valve. The pilot pressure synchronizing means for synchronizing with the pilot pressure for the switching valve makes it possible to open and close the load holding valve and the directional switching valve. The switching timing is appropriately achieved via the pilot pressure synchronizing means for both valves, that is, the timing switching position of the switching spool, so that the opening of the load holding valve appropriately precedes the switching of the direction switching valve. The external port and external piping required for the pressurized oil, which are conventionally required, are housed in the valve pair and become unnecessary. That is, the operability of the actuator can be improved, and the structure can be simplified and reduced in size.
【図１】本発明に係る負荷保持切換弁装置の一実施例を
示す油圧回路図である。FIG. 1 is a hydraulic circuit diagram showing an embodiment of a load holding switching valve device according to the present invention.
【図２】図１に示す負荷保持切換弁装置の全体構造図で
ある。FIG. 2 is an overall structural view of the load holding switching valve device shown in FIG.
【図３】従来の負荷保持切換弁装置を示す油圧回路図で
ある。FIG. 3 is a hydraulic circuit diagram showing a conventional load holding switching valve device.
１ 負荷保持切換弁装置 ２ 弁体 ３ アクチュエータ ４ 負荷 ５ 油圧ポンプ ６ ポンプ油路 ７ 供給油路 ８ 排出油路 ９ タンク油路 １０、１１ 油圧源 ２０ 方向切換弁 ２１ 切換スプール ２２ タンク通路 ２３ 供給通路 ３０ 負荷保持弁 ３１ スプリング ３２ スプリング室 ３３ 絞り ５０ 開閉手段 ５１ パイロットチェック弁 ５２ パイロット圧同期手段 ５３ 開閉ピストン ５４ タイミング機構 ５５ 負荷保持弁用パイロット圧油ｐb の供給油路 ５６ 負荷保持弁用パイロット圧油ｐb の排出油路 ５７、５８ タイミング切換位置部 ５９ 油路 ６０ チェック弁 ６１、６２ 前後シリンダ室 DESCRIPTION OF SYMBOLS 1 Load holding switching valve device 2 Valve element 3 Actuator 4 Load 5 Hydraulic pump 6 Pump oil path 7 Supply oil path 8 Drain oil path 9 Tank oil path 10, 11 Hydraulic power source 20 Direction switching valve 21 Switching spool 22 Tank path 23 Supply path Reference Signs List 30 load holding valve 31 spring 32 spring chamber 33 throttle 50 opening / closing means 51 pilot check valve 52 pilot pressure synchronizing means 53 opening / closing piston 54 timing mechanism 55 supply oil path of pilot pressure oil pb for load holding valve 56 pilot pressure oil for load holding valve Pb discharge oil passage 57, 58 Timing switching position 59 Oil passage 60 Check valve 61, 62 Front and rear cylinder chamber
Claims (3)
の給排油路を介して交互に給排する方向切換弁と、前記
アクチュエータからの排出油を一時的に遮断保持するよ
う前記一対の給排油路の中のアクチュエータ負荷側の排
出油路内に配置される負荷保持弁とからなり、前記方向
切換弁および負荷保持弁は、それぞれ方向切換弁用およ
び負荷保持弁用のパイロット圧で操作する切換スプール
および開閉手段を有し、前記負荷保持弁および方向切換
弁がそれぞれ連動的に開成および切換えることによって
前記保持排出油を開放するよう構成してなる負荷保持切
換弁装置において、 前記開閉手段は、負荷保持弁用パイロット圧で作動して
負荷保持弁を開閉するパイロット操作弁と、前記負荷保
持弁用パイロット圧を方向切換弁用パイロット圧に同期
させるパイロット圧同期手段とから構成することを特徴
とする負荷保持切換弁装置。A direction switching valve for alternately supplying and discharging hydraulic oil to and from an actuator through a pair of oil supply and discharge passages; and a pair of supply and discharge valves for temporarily shutting off and holding drainage from the actuator. A load holding valve disposed in the discharge oil passage on the actuator load side in the oil discharge passage, wherein the direction switching valve and the load holding valve are operated by pilot pressures for the direction switching valve and the load holding valve, respectively. A load holding switching valve device having a switching spool and opening / closing means for opening and switching the load holding valve and the direction switching valve in conjunction with each other to release the held discharge oil. Are pilot operated valves that operate with the load holding valve pilot pressure to open and close the load holding valve, and that the pilot pressure for the load holding valve is the same as the pilot pressure for the direction switching valve. Load retention switching valve device, characterized in that composed of a pilot 圧同 life means for.
圧油を排出することにより当該弁を開成するパイロット
チェック弁から形成し、一方パイロット圧同期手段は、
前記パイロットチェック弁を開閉作動する開閉ピストン
と、この開閉ピストンを切換スプールの方向切換弁の切
換えに同期して作動させるタイミング機構とから形成し
てなる請求項１記載の負荷保持切換弁装置。2. The pilot control valve is formed by a pilot check valve that opens the load holding valve by discharging the internal pressure oil, while the pilot pressure synchronizing means includes:
2. The load holding switching valve device according to claim 1, further comprising an opening / closing piston for opening and closing the pilot check valve, and a timing mechanism for operating the opening / closing piston in synchronization with switching of the direction switching valve of the switching spool.
ット圧油を開閉ピストンの前後シリンダ室へ給排した後
に方向切換弁のタンク通路と連通するよう弁体内に設け
たパイロット圧給排油路と、この給排油路と交叉連通す
る切換スプールの切換位置部であって方向切換弁用パイ
ロット圧による切換スプールの切換え動作に際してその
方向切換弁の切換え動作に少なくとも先行して前記負荷
保持弁用パイロット圧油の供給油路を連通すると共に排
出油路を前記タンク通路へ連通するタイミング切換位置
部とから形成してなる請求項２記載の負荷保持切換弁装
置。3. A pilot pressure supply / drainage passage provided in a valve body so as to communicate with a tank passage of a directional control valve after supplying / discharging pilot pressure oil for a load holding valve to front / rear cylinder chambers of an opening / closing piston. At the switching position of the switching spool cross-communicating with the oil supply / discharge passage, and at the time of switching operation of the switching spool by the pilot pressure for the direction switching valve, at least prior to the switching operation of the direction switching valve, the pilot for the load holding valve is provided. 3. The load holding switching valve device according to claim 2, further comprising a timing switching position for communicating a supply oil passage for the pressure oil and a discharge oil passage for communicating with the tank passage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07236797A JP3821906B2 (en) | 1997-03-25 | 1997-03-25 | Load holding switching valve device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07236797A JP3821906B2 (en) | 1997-03-25 | 1997-03-25 | Load holding switching valve device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10267009A true JPH10267009A (en) | 1998-10-06 |
| JP3821906B2 JP3821906B2 (en) | 2006-09-13 |
Family
ID=13487281
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP07236797A Expired - Lifetime JP3821906B2 (en) | 1997-03-25 | 1997-03-25 | Load holding switching valve device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3821906B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1387089A2 (en) | 2002-07-30 | 2004-02-04 | Kobelco Construction Machinery Co., Ltd. | Hydraulic actuator circuit |
| JP2010013855A (en) * | 2008-07-03 | 2010-01-21 | Hitachi Constr Mach Co Ltd | Hydraulic circuit device of construction machinery |
| JP2013139316A (en) * | 2012-01-04 | 2013-07-18 | Toyota Industries Corp | Lifting device |
-
1997
- 1997-03-25 JP JP07236797A patent/JP3821906B2/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1387089A2 (en) | 2002-07-30 | 2004-02-04 | Kobelco Construction Machinery Co., Ltd. | Hydraulic actuator circuit |
| EP1387089A3 (en) * | 2002-07-30 | 2008-03-05 | Kobelco Construction Machinery Co., Ltd. | Hydraulic actuator circuit |
| JP2010013855A (en) * | 2008-07-03 | 2010-01-21 | Hitachi Constr Mach Co Ltd | Hydraulic circuit device of construction machinery |
| JP2013139316A (en) * | 2012-01-04 | 2013-07-18 | Toyota Industries Corp | Lifting device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3821906B2 (en) | 2006-09-13 |
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