JPH0232479U

JPH0232479U -

Info

Publication number: JPH0232479U
Application number: JP11138688U
Authority: JP
Priority date: 1988-08-25
Filing date: 1988-08-25
Publication date: 1990-02-28
Anticipated expiration: 2003-08-25
Also published as: JPH0624305Y2

Description

[Brief explanation of drawings]

第１図は本考案の一実施例を示す四輪操舵装置
の回転シヤフト部（第３図のＢ１枠内）の一部破
断拡大図、第２図は第１図の―線に沿つて見
た断面図、第３図は本考案の一実施例を示す四輪
操舵装置を備えた車両の全体概略図、第４図は第
１図の後輪操舵機構を車両前方から見た一部破断
正面図、第５図は同後輪操舵機構の縦断正面図、
第６図は第４図の―線に沿つて見た断面図、
第７図は第４図の―線に沿つて見た断面図、
第８図は第１図の回転シヤフトのトルク―回転角
特性グラフ、第９図は第１図の後輪操舵機構の入
力軸のトルク―回転角特性グラフ、第１０図及び
第１１図は後輪の前輪に対する操舵特性グラフで
ある。符号の説明、Ａ…前輪操舵機構、Ｂ…操舵力伝
達シヤフト、Ｃ…後輪操舵機構、ＦＷ１，ＦＷ２
…前輪、ＲＷ１，ＲＷ２…後輪、ＳＭ…支持機構
、ＣＭ…中立付勢機構、ＳＳ…舵角比センサユニ
ツト、１１…ラツクバー、１３…操舵ハンドル、
２３…第１回転シヤフト、２３ａ，２３ｂ…突起
、２４…第２回転シヤフト、２４ｂ，２４ｃ…貫
通孔、３２…入力軸、３５…作動ロツド、３６…
モータ、３８…ハウジング、４２…回転部材、４
４…第１支持体、４８…ラツクバー、５５…シヤ
フト、５６，５７…リテーナ、５８…スプリング
、６６…第２支持体、６８…ピン、７２…ホイー
ル、７５…ウオーム。 Fig. 1 is a partially cutaway enlarged view of the rotary shaft portion of a four-wheel steering system (inside the B1 frame in Fig. 3) showing an embodiment of the present invention, and Fig. 2 is a view taken along the line - in Fig. 1. FIG. 3 is an overall schematic diagram of a vehicle equipped with a four-wheel steering system showing an embodiment of the present invention, and FIG. 4 is a partially cutaway view of the rear wheel steering mechanism shown in FIG. 1 from the front of the vehicle. A front view, FIG. 5 is a longitudinal sectional front view of the same rear wheel steering mechanism,
Figure 6 is a sectional view taken along the - line in Figure 4;
Figure 7 is a cross-sectional view taken along the - line in Figure 4;
Figure 8 is a torque-rotation angle characteristic graph of the rotating shaft in Figure 1, Figure 9 is a torque-rotation angle characteristic graph of the input shaft of the rear wheel steering mechanism in Figure 1, and Figures 10 and 11 are rear It is a steering characteristic graph for front wheels. Explanation of symbols, A...Front wheel steering mechanism, B...Steering force transmission shaft, C...Rear wheel steering mechanism, FW1, FW2
...Front wheel, RW1, RW2...Rear wheel, SM...Support mechanism, CM...Neutral biasing mechanism, SS...Steering angle ratio sensor unit, 11...Rack bar, 13...Steering handle,
23...First rotation shaft, 23a, 23b...Protrusion, 24...Second rotation shaft, 24b, 24c...Through hole, 32...Input shaft, 35...Operating rod, 36...
Motor, 38...Housing, 42...Rotating member, 4
4... First support body, 48... Rack bar, 55... Shaft, 56, 57... Retainer, 58... Spring, 66... Second support body, 68... Pin, 72... Wheel, 75... Worm.

Claims

[Scope of utility model registration request]

a front wheel steering mechanism that steers the front wheels in response to rotation of a steering wheel; and a front wheel steering mechanism that is connected to the front wheel steering mechanism at the front end and extends rearward and rotates around an axis in response to the steering of the front wheels to steer the rotation rearward. and a neutral biasing device connected to the rear end of the rotary shaft to steer the rear wheels according to the rotation of the rotary shaft and bias the steering of the rear wheels to a neutral position. A four-wheel steering system for a vehicle comprising a rear wheel steering mechanism, wherein the rotary shaft is divided into a first and a second rotary shaft in the front and rear, and a first joint portion formed on the first rotary shaft side and the second rotary shaft. The first and second rotary shafts are connected to each other so as to transmit rotational force via a power transmission mechanism having a clearance between the first and second joint portions formed on the rotary shaft side, and the first and second rotary shafts are A four-wheel steering device for a vehicle, characterized in that the two are connected by a torsion bar.