JPH0251701U - - Google Patents
Info
- Publication number
- JPH0251701U JPH0251701U JP13070888U JP13070888U JPH0251701U JP H0251701 U JPH0251701 U JP H0251701U JP 13070888 U JP13070888 U JP 13070888U JP 13070888 U JP13070888 U JP 13070888U JP H0251701 U JPH0251701 U JP H0251701U
- Authority
- JP
- Japan
- Prior art keywords
- port
- passage
- slide spool
- tank
- pressure chamber
- 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
- 230000007935 neutral effect Effects 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 3
- 239000012530 fluid Substances 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 8
Landscapes
- Fluid-Pressure Circuits (AREA)
Description
第1図〜第6図は本考案に係る液圧駆動装置に
おける制御装置の1実施例を示すもので、第1図
は全体の縦断面図、第2図はスライドスプールの
側面図、第3図は方向切換弁の一部を示す説明図
、第4図は油圧回路図、第5図イ〜ホはスライド
スプールを中立位置から作動位置に切換える行程
を段階的に示す作用説明図、第6図は第5図と同
様の作用説明図であつて、回路図で示したもので
あり、第7図は従来の液圧駆動装置における制御
装置の切換え行程を第6図対比して示す作用説明
図、第8図は従来装置の油圧回路図を示すもので
ある。
a……絞り付きスプール形方向切換弁、b……
圧力補償弁、31,31a……ハウジング、32
……スリーブ、33……ポンプポート、34……
タンクポート、35……負荷側Aポート、36…
…負荷側Bポート、37……ポンプライン、38
……タンクライン、39……アクチユエータ、4
3……スライドスプール、49,50,53,5
4……環状の凹溝、51,52……絞り部、57
……ドレーンの溜り部、59……ドレーンライン
、60……選択連結通路、61……通路、62a
,62b……連結口、63,64……開閉通路、
65……一方向通路、66……チエツク弁、67
……戻り通路、68……シリンダ、69……ピス
トン、70……入口ポート、71……出口ポート
、72,73……連結ポート。
1 to 6 show one embodiment of a control device in a hydraulic drive device according to the present invention, in which FIG. 1 is an overall vertical sectional view, FIG. 2 is a side view of the slide spool, and FIG. 3 is a side view of the slide spool. The figure is an explanatory diagram showing a part of the directional control valve, Fig. 4 is a hydraulic circuit diagram, Fig. 5 A to E are action explanatory diagrams showing step-by-step the process of switching the slide spool from the neutral position to the operating position, and Fig. 6 is an explanatory diagram showing a part of the directional control valve. The figure is an explanatory diagram similar to that shown in Figure 5, which is shown in the form of a circuit diagram, and Figure 7 is an explanatory diagram showing the switching process of the control device in a conventional hydraulic drive device in comparison with Figure 6. 8 shows a hydraulic circuit diagram of a conventional device. a... Spool type directional valve with throttle, b...
Pressure compensation valve, 31, 31a...Housing, 32
...Sleeve, 33...Pump port, 34...
Tank port, 35...Load side A port, 36...
...Load side B port, 37...Pump line, 38
... Tank line, 39 ... Actuator, 4
3...Slide spool, 49, 50, 53, 5
4... Annular groove, 51, 52... Squeezed portion, 57
... Drain reservoir, 59... Drain line, 60... Selective connection passage, 61... Passage, 62a
, 62b... Connection port, 63, 64... Opening/closing passage,
65...One-way passage, 66...Check valve, 67
... Return passage, 68 ... Cylinder, 69 ... Piston, 70 ... Inlet port, 71 ... Outlet port, 72, 73 ... Connection port.
Claims (1)
を備えたスリーブ内でスライドスプールを摺動さ
せることにより流路の切換え及び流量を制御する
ように構成した絞り付きスプール形方向切換弁と
、シリンダ内に摺動自在に収納したピストンの一
端側には一次圧力室を、また、他端側にはバネを
有する二次圧力室を備え、上記方向切換弁のスラ
イドスプールの絞り部の前後の圧力差を一定値に
保持させる共に、スライドスプールの中立位置に
おいては、ポンプ側から圧力流体をピストンを二
次圧力室側へ摺動させながら上記シリンダ内を通
過させてタンク側に戻すように構成した圧力補償
弁とより成り、 上記方向切換弁には、上記二次圧力室と常時連
結されていると共に上記スライドスプールを作動
位置に切換えたとき、負荷側ポートと連結させて
負荷側の圧力(二次圧)を上記二次圧力室へ導入
させるように構成した選択連結通路と、該選択連
結通路と上記タンクポートとをチエツク弁を介し
て連結し、選択連結通路からタンクポート側への
み流体の通過を許容すると共に、上記スライドス
プールを作動位置に切換えたとき、タンクポート
との連結を遮断させるように構成した一方向通路
と、上記スライドスプールが中立位置にあるとき
、上記選択連結通路を外部のドレーンラインに連
結したドレーン溜り部と連結させるように構成し
た連結口、とが形成されており、 上記スライドスプールを摺動させて中立位置か
ら作動位置に切換え移行する行程において、まづ
、最初の段階で上記連結口が閉じ、次いで、上記
選択連結通路と負荷側ポートとが連結し、次いで
上記一方向通路が閉じ、次いで上記ポンプポート
と負荷側ポートとが連結するように構成したこと
を特徴とする液圧駆動装置における制御装置。[Claims for Utility Model Registration] A spool type directional switch with a throttle configured to switch the flow path and control the flow rate by sliding a slide spool within a sleeve equipped with a pump port, a tank port, and a load side port. A primary pressure chamber is provided at one end of the valve and a piston slidably housed in the cylinder, and a secondary pressure chamber with a spring is provided at the other end, and the throttle portion of the slide spool of the directional control valve At the same time, when the slide spool is in the neutral position, the pressure fluid from the pump side is passed through the cylinder while sliding the piston toward the secondary pressure chamber side and returned to the tank side. The directional control valve is always connected to the secondary pressure chamber, and when the slide spool is switched to the operating position, the directional control valve is connected to the load side port and is connected to the load side port. A selective connecting passage configured to introduce a pressure (secondary pressure) into the secondary pressure chamber, the selective connecting passage and the tank port are connected via a check valve, and the selective connecting passage is connected to the tank port side from the selective connecting passage to the tank port side. A one-way passage configured to allow passage of fluid only to the tank port and to cut off connection with the tank port when the slide spool is switched to the operating position, and when the slide spool is in the neutral position, A connection port configured to connect the connection passage to a drain reservoir connected to an external drain line is formed, and in the process of sliding the slide spool and switching from the neutral position to the operating position, First, in the first step, the connection port is closed, then the selected connection passage and the load side port are connected, then the one-way passage is closed, and then the pump port and the load side port are connected. A control device for a hydraulic drive device, characterized in that:
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13070888U JPH0740083Y2 (en) | 1988-10-05 | 1988-10-05 | Control device for hydraulic drive |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13070888U JPH0740083Y2 (en) | 1988-10-05 | 1988-10-05 | Control device for hydraulic drive |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0251701U true JPH0251701U (en) | 1990-04-12 |
JPH0740083Y2 JPH0740083Y2 (en) | 1995-09-13 |
Family
ID=31386122
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13070888U Expired - Lifetime JPH0740083Y2 (en) | 1988-10-05 | 1988-10-05 | Control device for hydraulic drive |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0740083Y2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1996000351A1 (en) * | 1994-06-27 | 1996-01-04 | Komatsu Ltd. | Directional control valve device provided with a pressure compensating valve |
JP2010164182A (en) * | 2009-01-19 | 2010-07-29 | Toyota Industries Corp | Hydraulic control device for industrial vehicle |
-
1988
- 1988-10-05 JP JP13070888U patent/JPH0740083Y2/en not_active Expired - Lifetime
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1996000351A1 (en) * | 1994-06-27 | 1996-01-04 | Komatsu Ltd. | Directional control valve device provided with a pressure compensating valve |
JP2010164182A (en) * | 2009-01-19 | 2010-07-29 | Toyota Industries Corp | Hydraulic control device for industrial vehicle |
Also Published As
Publication number | Publication date |
---|---|
JPH0740083Y2 (en) | 1995-09-13 |
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