JPS6332068U

JPS6332068U -

Info

Publication number: JPS6332068U
Application number: JP12643786U
Authority: JP
Priority date: 1986-08-19
Filing date: 1986-08-19
Publication date: 1988-03-01

Description

[Brief explanation of drawings]

第１図は本考案の一実施例を示す車両用動力舵
取装置の全体構成図、第２図は第１図の２―２線
に沿う断面図、第３図は第１図に示した流量調整
弁の拡大断面図、第４図は第１図にて示した電磁
可変絞り弁の部分拡大断面図、第５図は第１図に
示した装置によつて得られる特性線図、第６図は
電磁可変絞り弁のソレノイドへの印加電流値と反
力油室内油圧の関係を示すグラフである。符号の説明、Ａ……制御弁、Ｂ……油圧反力機
構、Ｂ１……反力油室、Ｃ……パワーシリンダ、
Ｄ……流量調整弁（供給装置）、Ｅ……電磁可変
絞り弁、Ｆ……車速センサ、Ｇ……励磁電流発生
器、Ｐ……油圧ポンプ、Ｒ……リザーバ、１０…
…ステアリングハンドル、１７……ピストン（押
圧子）、２１……供給油路、２６……排出油路、
３２……スプール、３２ａ……可変ポート、３２
ｃ……リリーフポート、３７……ソレノイド。 Fig. 1 is an overall configuration diagram of a power steering system for a vehicle showing an embodiment of the present invention, Fig. 2 is a sectional view taken along line 2-2 in Fig. 1, and Fig. 3 is the same as shown in Fig. 1. 4 is a partially enlarged sectional view of the electromagnetic variable throttle valve shown in FIG. 1; FIG. 5 is a characteristic diagram obtained by the device shown in FIG. 1; FIG. 6 is a graph showing the relationship between the current value applied to the solenoid of the electromagnetic variable throttle valve and the oil pressure in the reaction oil chamber. Explanation of symbols, A...Control valve, B...Hydraulic reaction force mechanism, B1...Reaction oil chamber, C...Power cylinder,
D...Flow rate adjustment valve (supply device), E...Variable electromagnetic throttle valve, F...Vehicle speed sensor, G...Exciting current generator, P...Hydraulic pump, R...Reservoir, 10...
... Steering handle, 17 ... Piston (presser), 21 ... Supply oil path, 26 ... Discharge oil path,
32...Spool, 32a...Variable port, 32
c...Relief port, 37...Solenoid.

Claims

[Scope of utility model registration request]

A control valve that operates according to the handle operating force to supply and discharge pressure oil discharged from the hydraulic pump to the power cylinder, a reaction oil chamber, and a reaction force that is pressed by the hydraulic pressure applied to the oil chamber and exerts a reaction force on the handle side. a hydraulic reaction force mechanism having a pusher for transmitting the pressure, the reaction oil chamber is connected to a supply device that constantly supplies a predetermined amount of hydraulic oil and also connected to a reservoir, and the reaction oil chamber and the reservoir are connected to each other. In a power steering system for a vehicle, a connected discharge oil passage is provided with an electromagnetic variable throttle valve that increases the amount of curvature in the oil passage according to an increase in vehicle speed,
As the electromagnetic variable throttle valve, when the applied current value is between at least a first set value and not more than a second set value, the opening degree increases in accordance with an increase in the applied current value, and when the applied current value is zero. A power steering system for a vehicle, characterized in that it employs a valve equipped with a variable port that closes and a relief port that opens when the applied current value is zero and closes when the applied current value is at least above the first set value.