JPH024074U

JPH024074U -

Info

Publication number: JPH024074U
Application number: JP16604488U
Authority: JP
Priority date: 1988-12-22
Filing date: 1988-12-22
Publication date: 1990-01-11
Also published as: JPH0440057Y2

Description

[Brief explanation of drawings]

第１図は、本考案による切換弁の断面図を含む
油圧シリンダの制御回路図、第２図及び第３図は
、第１図に示した切換弁の作動説明図、第４図は
、本考案の他の実施例の断面図、第５図は、強粘
性物質圧送用ポンプ回路図、第６図は、第５図に
示した回路に用いられる従来の切換弁の一部を断
面図とした正面図、第７図は、第６図のＢ―Ｂ断
面を示す断面図。１……切換弁、２……弁本体、４……スプール
、５……ポンプポート、７……タンクポート、１
１，１２……パイロツト室、１３，１４……保持
室、１５，１６ａ，１６ｂ，１７……孔、２０，
２１……溝。 FIG. 1 is a control circuit diagram of a hydraulic cylinder including a sectional view of the switching valve according to the present invention, FIGS. 2 and 3 are explanatory diagrams of the operation of the switching valve shown in FIG. 1, and FIG. 5 is a sectional view of another embodiment of the invention, FIG. 5 is a circuit diagram of a pump for pumping a highly viscous substance, and FIG. 6 is a sectional view of a part of a conventional switching valve used in the circuit shown in FIG. FIG. 7 is a cross-sectional view taken along the line BB in FIG. 6. 1...Switching valve, 2...Valve body, 4...Spool, 5...Pump port, 7...Tank port, 1
1, 12... Pilot chamber, 13, 14... Holding chamber, 15, 16a, 16b, 17... Hole, 20,
21... Groove.

補正平１．５．２２実用新案登録請求の範囲を次のように補正する
。Amendment May 22, 2001 The scope of claims for utility model registration is amended as follows.

【実用新案登録請求の範囲】弁本体の貫通穴に中央のポンプポートとその両
側の出力ポートと更に両側のタンクポートとを設
け、この貫通穴にスプールを摺動自在に設け、こ
のスプールの両端部にスプールを作動させるパイ
ロツト室とスプールの作動位置を保持する保持室
とを端から順に設け、パイロツト室への圧油給排
によりスプールを作動させて圧油の流れ方向を切
り換えると共に保持室への圧油給排によりスプー
ルの切り換え位置を保持する自己保持機能を有す
る切換弁において、前記スプールに、前記ポンプポートが常時連通
する中心孔を設けると共に、この中心孔の両端に
、中心孔に連通し前記スプールの外周に開口する
縦孔を設け、この縦孔は、その一方が前記スプー
ル作動により前記保持室に開口するとき、他方が
前記弁本体で閉鎖される位置とし、前記スプール
の両端には、前記縦孔が前記保持室に開口した時
弁本体で閉鎖され、前記縦孔が前記弁本体で閉鎖
され時前記保持室をタンクポートに連通するスリ
ツトを設けたことを特徴とする自己保持機能を有
する切換弁。図面の簡単な説明を次のように補正する。明細書第１５頁第３行の「１５，１６ａ，１６
ｂ，１７…孔」を「１６ａ，１６ｂ…縦孔、１７
…中心孔」と補正する。明細書第１５頁第４行の「２０，２１…溝」を
「２０，２１…スリツト。」と補正する。[Claim for Utility Model Registration] A central pump port, output ports on both sides of the central pump port, and tank ports on both sides are provided in the through hole of the valve body, and a spool is slidably provided in the through hole, and both ends of the spool are provided. A pilot chamber for operating the spool and a holding chamber for maintaining the operating position of the spool are provided in order from the end, and by supplying and discharging pressure oil to the pilot chamber, the spool is operated and the flow direction of the pressure oil is switched, and the flow direction of the pressure oil is transferred to the holding chamber. In the switching valve having a self-holding function that maintains the switching position of the spool by supplying and discharging pressurized oil, the spool is provided with a center hole with which the pump port is constantly communicated, and both ends of the center hole are communicated with the center hole. A vertical hole is provided on the outer periphery of the spool, and when one of the vertical holes opens into the holding chamber by the spool operation, the other is closed by the valve body, and a vertical hole is provided at both ends of the spool. The self-holding device is characterized in that a slit is provided which is closed by the valve body when the vertical hole opens into the holding chamber, and which communicates the holding chamber with a tank port when the vertical hole is closed by the valve body. A switching valve with functions. The brief description of the drawing has been amended as follows. “15, 16a, 16” on page 15, line 3 of the specification
b, 17...hole" to "16a, 16b...vertical hole, 17
…The center hole” is corrected. "20, 21...groove" on page 15, line 4 of the specification is corrected to "20, 21... slit."

Claims

[Scope of utility model registration request]

In the switching valve, a pilot chamber is provided at both ends of a spool for switching the flow direction of pressure oil, and the spool is actuated by supplying and discharging pressure oil to the pilot chamber. A switching valve that has a self-holding function and is provided with a switching section that connects a holding chamber connected to a pilot chamber side to which oil is supplied to a tank port and another holding chamber to a pump port.