JPH03100573U - - Google Patents

Description

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

第１図は本発明の一実施例を示す断面図、第２
図は第１図の−線に沿う断面図、第３ｂ図は
反力機構２を構成する入力軸５の端部を示す正面
図、第３ａ図は第３ｂ図の左側面図、第４ａ図は
反力機構２を構成する出力軸９の端部を示す正面
図、第４ｂ図は第４ａ図の右側面図、第５図は第
１図の要部拡大図、第６図は第５図の操舵時を示
す図、第７図および第８図はそれぞれ第２の実施
例および第３の実施例の要部を示す図、第９図は
従来の動力舵取装置の反力制御装置を示す回路図
、第１０図は本実施例と従来装置の特性を比較し
て示す線図、第１１図は従来装置の特性を示す線
図である。 １……サーボ弁、２……反力機構、５……入力
軸、６，７……弁部材、９……出力軸、２１……
溝、２３……係合部材、２５……反力ピストン、
２７……油圧反力室、５０……可変オリフイス。 FIG. 1 is a cross-sectional view showing one embodiment of the present invention, and FIG.
The figure is a sectional view taken along the - line in Figure 1, Figure 3b is a front view showing the end of the input shaft 5 that constitutes the reaction force mechanism 2, Figure 3a is a left side view of Figure 3b, and Figure 4a is 4b is a right side view of FIG. 4a, FIG. 5 is an enlarged view of the main part of FIG. 1, and FIG. 7 and 8 are diagrams showing the main parts of the second embodiment and the third embodiment, respectively, and FIG. 9 is a conventional reaction force control device for a power steering device. FIG. 10 is a diagram comparing the characteristics of this embodiment and the conventional device, and FIG. 11 is a diagram showing the characteristics of the conventional device. DESCRIPTION OF SYMBOLS 1... Servo valve, 2... Reaction force mechanism, 5... Input shaft, 6, 7... Valve member, 9... Output shaft, 21...
groove, 23... engaging member, 25... reaction piston,
27...Hydraulic reaction force chamber, 50...Variable orifice.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 舵取ハンドルの操作により回転される入力軸と
、この入力軸と同一軸線上に配設された出力軸と
、これら両軸にそれぞれ一体回転可能に設けられ
た一対の弁部材から成るサーボ弁と、油圧反力室
に供給される油圧に応じて操舵反力を生じさせる
反力機構とを備え、この反力機構が、出力軸に対
し摺動可能に保持された反力ピストンと、入力軸
に形成された溝と、油圧反力室内の油圧によつて
反力ピストンに押されて上記溝に係合する係合部
材とから構成された動力舵取装置において、上記
反力ピストンと出力軸との間に可変オリフイスを
設け、操舵による反力ピストンの移動によつて、
上記油圧反力室と、反力ピストンを隔てた低圧側
とを連通し、かつ、操舵角の増大に応じてその開
口面積を拡大することを特徴とする動力舵取装置
の反力制御装置。 A servo valve consisting of an input shaft rotated by operation of a steering wheel, an output shaft disposed on the same axis as the input shaft, and a pair of valve members each rotatably provided on both shafts. , a reaction force mechanism that generates a steering reaction force in accordance with the hydraulic pressure supplied to the hydraulic reaction force chamber, and this reaction force mechanism includes a reaction force piston that is slidably held with respect to the output shaft, and an input shaft In the power steering device, the reaction piston and the output shaft are configured to include a groove formed in the groove, and an engaging member that is pushed by the reaction piston and engaged with the groove by the hydraulic pressure in the hydraulic reaction chamber. A variable orifice is installed between the
A reaction force control device for a power steering device, characterized in that the hydraulic reaction force chamber communicates with a low pressure side separated by a reaction piston, and its opening area is expanded in accordance with an increase in a steering angle.