JPS6419574U

JPS6419574U -

Info

Publication number: JPS6419574U
Application number: JP11553487U
Authority: JP
Priority date: 1987-07-28
Filing date: 1987-07-28
Publication date: 1989-01-31

Description

[Brief explanation of the drawing]

第１図は本考案に従つた流量制御弁の一実施例
を示す要部断面図、第２図は第１図における検出
手段と制御手段の一実施例を示すブロツク回路図
、第３図は第２図に示す制御手段の制御回路の作
動説明図、第４図は本考案により得られるポンプ
回転数と吐出流量の関係を示す特性図である。１０……流量制御弁、１１……流入通路、１２
……吐出通路、１３……ドレン通路、１４……ハ
ウジング、１４ａ……流入ポート、１４ｂ……吐
出ポート、１４ｃ……ドレンポート、１５……ス
プール弁、１６……第１室、１９……リテーナ、
２０……スプリング、２１……ステツプモータ、
２３……検出手段、２４……制御手段、２９……
リード。 FIG. 1 is a cross-sectional view of essential parts showing an embodiment of a flow control valve according to the present invention, FIG. 2 is a block circuit diagram showing an embodiment of the detection means and control means in FIG. 1, and FIG. FIG. 2 is an explanatory diagram of the operation of the control circuit of the control means shown in FIG. 2, and FIG. 4 is a characteristic diagram showing the relationship between the pump rotation speed and the discharge flow rate obtained by the present invention. 10...Flow rate control valve, 11...Inflow passage, 12
...Discharge passage, 13...Drain passage, 14...Housing, 14a...Inflow port, 14b...Discharge port, 14c...Drain port, 15...Spool valve, 16...First chamber, 19... retainer,
20...Spring, 21...Step motor,
23...detection means, 24...control means, 29...
Lead.

Claims

[Scope of utility model registration request]

An inflow port through which fluid discharged from the pump flows through an inflow passage, a discharge port through which fluid discharged from the pump flows out to the hydraulic equipment through the discharge passage, and a reservoir through which fluid discharged from the pump flows through a drain passage. a housing equipped with a drain port for returning water to the drain port; a spool valve that is fitted into the housing so as to be movable in the axial direction and opens and closes the drain port; one end is locked to the spool valve and the other end is locked to a retainer. a spring that always biases the spool valve in a direction in which the drain port closes; a motor that is connected to the retainer via a lead and is capable of moving the retainer in the axial direction of the housing; and a vehicle running speed or transmission. a detection means for detecting the shift position of the motor; and a control means for issuing an output signal for controlling the rotation of the motor in accordance with an output signal of the detection means, when the vehicle traveling speed is high or the shift position of the transmission is high. The flow rate control valve is characterized in that the retainer is moved in the opening direction of the drain port to compress the spring and reduce the discharge flow rate.