JPH03124084U - - Google Patents

Description

【図面の簡単な説明】[Brief explanation of drawings]

第１図は本考案に係るパイロツト圧油のチエツ
ク弁付流量制御弁装置の一実施例を示す縦断面図
、第２図は第１図の−線断面図、第３図は本
考案に係るチエツク弁付流量制御弁の別の実施例
を示す縦断面図、第４図は従来のチエツク弁付流
量制御弁を示す縦断面図、第５図は建設機械のア
クチユエータ駆動油圧回路を示す回路図である。 ２２……複合制御弁、２４，２６……単位切換
弁、２４ａ……パイロツトポート、３６ａ……パ
イロツト配管、７０……チエツク弁付流量制御弁
、７２……チエツク弁、７４……流量制御弁、７
６……チエツクポペツト、７８……チエツクシー
ト、８０……オリフイス、８２……流量制御スプ
ール、８４……外周油路、８４ａ……軸直角油路
、８６……室、８８……流量制御油路、９０……
環状油路、９２……流量制御スプリング、９４…
…室、９６……チエツクスプリング、９８……室
、１００……チエツク弁付流量制御弁。 Fig. 1 is a longitudinal cross-sectional view showing an embodiment of a flow control valve device with a check valve for pilot pressure oil according to the present invention, Fig. 2 is a cross-sectional view taken along the line - - of Fig. 1, and Fig. 3 is a cross-sectional view according to the present invention. FIG. 4 is a vertical sectional view showing another embodiment of a flow control valve with a check valve; FIG. 4 is a longitudinal sectional view showing a conventional flow control valve with a check valve; FIG. 5 is a circuit diagram showing an actuator drive hydraulic circuit for construction machinery. It is. 22...Composite control valve, 24, 26...Unit switching valve, 24a...Pilot port, 36a...Pilot piping, 70...Flow rate control valve with check valve, 72...Check valve, 74...Flow rate control valve ,7
6... Check poppet, 78... Check sheet, 80... Orifice, 82... Flow rate control spool, 84... Outer peripheral oil passage, 84a... Axis perpendicular oil passage, 86... Chamber, 88... Flow rate control oil passage , 90...
Annular oil passage, 92...Flow rate control spring, 94...
...chamber, 96...check spring, 98...chamber, 100...flow control valve with check valve.

Claims (1)

【実用新案登録請求の範囲】 (1) 複合制御弁とその操作圧油制御用パイロツ
ト弁との間にパイロツト配管を介してチエツク弁
付流量制御弁を接続し、パイロツト圧油のパイロ
ツト弁から複合制御弁方向への流動時にはチエツ
ク弁を開いてパイロツト圧油を自由に通過させ、
パイロツト圧油の複合制御弁からパイロツト弁方
向への流動時には前記チエツク弁を閉じて流量制
御弁によりパイロツト圧油の通過流量を所定の流
量に制御するように構成したパイロツト圧油のチ
エツク弁付流量制御弁装置において、 前記チエツク弁付流量制御弁は、そのパイロツ
ト弁側に接続したＡポートと複合制御弁側に接続
したＢポートとが同一軸線上に配置されると共に
そのチエツク弁と流量制御弁とが前記同一軸線上
に一体直列に構成され、前記複合制御弁に対して
直結されるよう構成されるパイロツト圧油のチエ
ツク弁付流量制御弁装置。 (2) チエツク弁付流量制御弁は、そのチエツク
弁をパイロツト圧油の通過を阻止するチエツクポ
ペツトとチエツクシートとから構成し、流量制御
弁をオリフイスとこのオリフイスの通過流量を所
定の流量に制御する流量制御スプールと流量制御
スプリングとから構成し、前記Ａポート、チエツ
クシート、チエツクポペツトおよび前記Ｂポート
を同一軸線上に順次配設し、チエツクポペツトの
外側にチエツクシートとＢポートを連通するチエ
ツクポペツト外周油路を設け、チエツクポペツト
の内側に流量制御スプールを摺動自在に配設し、
前記チエツクポペツトの側壁にチエツクポペツト
外周油路と前記流量制御スプールとの間を連通す
る流量制御油路を設ける請求項１記載のパイロツ
ト圧油のチエツク弁付流量制御弁装置。[Scope of Claim for Utility Model Registration] (1) A flow control valve with a check valve is connected via pilot piping between the composite control valve and its pilot valve for controlling the operating pressure oil, and When the flow is in the direction of the control valve, the check valve is opened to allow pilot pressure oil to freely pass through.
A pilot pressure oil flow rate with a check valve configured to close the check valve when the pilot pressure oil flows from the composite control valve toward the pilot valve and control the passing flow rate of the pilot pressure oil to a predetermined flow rate by the flow control valve. In the control valve device, in the flow control valve with a check valve, the A port connected to the pilot valve side and the B port connected to the composite control valve side are arranged on the same axis, and the check valve and the flow control valve are arranged on the same axis. A flow control valve device with a check valve for pilot pressure oil configured to be integrally connected in series on the same axis and directly connected to the composite control valve. (2) A flow control valve with a check valve consists of a check poppet and a check seat that prevent passage of pilot pressure oil, and the flow control valve includes an orifice and controls the flow rate passing through the orifice to a predetermined flow rate. A check poppet outer circumferential oil passage consisting of a flow control spool and a flow control spring, in which the A port, check seat, check poppet, and B port are sequentially arranged on the same axis, and the check poppet communicates with the check seat and the B port on the outside of the check poppet. A flow control spool is slidably arranged inside the check poppet,
2. A flow control valve device with a check valve for pilot pressure oil according to claim 1, wherein a flow control oil passage is provided on a side wall of said check poppet to communicate between an outer peripheral oil passage of the check poppet and said flow rate control spool.