JPS6347980U

JPS6347980U -

Info

Publication number: JPS6347980U
Application number: JP14240586U
Authority: JP
Priority date: 1986-09-17
Filing date: 1986-09-17
Publication date: 1988-03-31

Description

[Brief explanation of the drawing]

第１図は本考案に係る後輪操舵装置の一例を示
す平面図、第２図は第１図の後輪操舵装置を備え
た車両の全体を機能的に示す図、第３図は第１図
のパワーシリンダ及び電磁切換えバルブの一部を
切断した拡大正面図、第４図は第３図の電磁切換
えバルブと可変オリフイスの関係を示す図、第５
図は目標舵角比の特性を示す図、第６図は中立復
帰用スプリングの特性を示す図、並びに第７図及
び第８図は第１図、第３図の一部変形例を示す図
である。符号の説明、Ａ……前輪操舵装置、Ｂ……後輪
操舵装置、Ｃ……電気制御装置、ＦＷ１，ＦＷ２
……前輪、ＲＷ１，ＲＷ２……後輪、２３……ス
テツプモータ、２４……制御バルブ装置、３１…
…リレーロツド、３２……ハウジング、３２ａ…
…ラツクハウジング、３２ｂ……チユーブ、３２
ｃ……ハウジングエンド、４０……パワーシリン
ダ、４１……シリンダ、４１ａ，４１ｂ……油室
、４３……ピストン、５０……電磁切換えバルブ
、６０……中立復帰機構、６１ａ，６１ｂ……ス
トツパ、６２ａ，６２ｂ……リテーナ、６３ａ，
６３ｂ……スプリング。 FIG. 1 is a plan view showing an example of a rear wheel steering device according to the present invention, FIG. 2 is a diagram functionally showing the entire vehicle equipped with the rear wheel steering device shown in FIG. 1, and FIG. Fig. 4 is a partially cutaway enlarged front view of the power cylinder and electromagnetic switching valve shown in Fig. 4; Fig. 4 is a diagram showing the relationship between the electromagnetic switching valve of Fig. 3 and the variable orifice;
Figure 6 shows the characteristics of the target steering angle ratio, Figure 6 shows the characteristics of the neutral return spring, and Figures 7 and 8 are partial modifications of Figures 1 and 3. It is. Explanation of symbols, A... Front wheel steering device, B... Rear wheel steering device, C... Electric control device, FW1, FW2
...Front wheel, RW1, RW2...Rear wheel, 23...Step motor, 24...Control valve device, 31...
...Relay rod, 32...Housing, 32a...
...Rack housing, 32b...Tube, 32
c...Housing end, 40...Power cylinder, 41...Cylinder, 41a, 41b...Oil chamber, 43...Piston, 50...Solenoid switching valve, 60...Neutral return mechanism, 61a, 61b...Stopper , 62a, 62b...retainer, 63a,
63b...Spring.

Claims

[Scope of utility model registration request]

A rear wheel steering device for a front and rear wheel steered vehicle having a relay rod that is displaceably assembled in the housing in an axial direction and that steers left and right rear wheels connected to both ends in response to the displacement from a neutral position, the relay rod being fitted in the housing. A cylinder that is fitted together and has both ends opened, and a cylinder that is fixed to the relay rod and partitions the inside of the cylinder into a pair of oil chambers, and provides a liquid-tight surface on the inner circumference of the cylinder according to the supply and discharge of hydraulic oil to each oil chamber. a pair of stopper portions provided on the inner periphery of the housing and spaced outwardly from both end surfaces of the cylinder; and a stopper portion that penetrates the relay rod and is movable in the axial direction of the relay rod. Each of the relay rods is incorporated into each oil chamber of the cylinder, and by coming into contact with the piston, the displacement of the relay rod in the direction of the other oil chamber is restricted, and by engagement with the end surface of the cylinder, the displacement of the relay rod in the direction of the other oil chamber is restricted. A pair of retainers whose displacement with respect to the housing is regulated, and a pair of springs each provided between the pair of retainers and the pair of stopper portions to press the pair of retainers toward the other oil chamber. A rear wheel steering device for a front and rear wheel steered vehicle, characterized by: