JPH0467178U - - Google Patents
Info
- Publication number
- JPH0467178U JPH0467178U JP10799990U JP10799990U JPH0467178U JP H0467178 U JPH0467178 U JP H0467178U JP 10799990 U JP10799990 U JP 10799990U JP 10799990 U JP10799990 U JP 10799990U JP H0467178 U JPH0467178 U JP H0467178U
- Authority
- JP
- Japan
- Prior art keywords
- steering angle
- electric motor
- vehicle speed
- output shaft
- rear wheel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Steering-Linkage Mechanisms And Four-Wheel Steering (AREA)
- Steering Control In Accordance With Driving Conditions (AREA)
Description
第１〜６図は本考案の四輪操舵装置の実施例を
示しており、第１図は全体構成を示す部分横断平
面図、第２図は第１図のＡ部拡大図、第３図は後
輪用出力軸の軸方向に亙る変位量と後輪用出力軸
の軸方向に加わるばね荷重との関係を示す線図、
第４図は車速と舵角比との関係を示す線図、第５
図は後輪に付与される舵角が次第に小さくなる状
態を示す線図、第６図は前輪に付与された舵角と
後輪に付与された舵角との関係を、時間の経過と
共に示す線図である。
１……ステアリングホイール、２……ステアリ
ングシヤフト、３……ステアリングギヤ、４……
前輪用出力軸、５……ナツクルアーム、６……前
輪、７……ステアリングコラム、８……舵角セン
サ、９……後輪、１０……ハウジング、１１……
後輪用出力軸、１２……着力点、１３……ナツク
ルアーム、１４……操舵中心、１５……ラツク歯
、１６……伝達軸、１７……ピニオン歯、１８…
…ウオームホイール、１９……電動モータ、２０
……出力軸、２１……ウオーム、２２……変位セ
ンサ、２３……車速センサ、２４……制御器、２
５……センタリングスプリング、２６……座板、
２７……段部、２８……ストツプリング、２９…
…皿板ばね、３１……電磁クラツチ、３２……回
転角センサ。
Figures 1 to 6 show an embodiment of the four-wheel steering system of the present invention, in which Figure 1 is a partial cross-sectional plan view showing the overall configuration, Figure 2 is an enlarged view of section A in Figure 1, and Figure 3. is a diagram showing the relationship between the displacement amount in the axial direction of the rear wheel output shaft and the spring load applied in the axial direction of the rear wheel output shaft,
Figure 4 is a diagram showing the relationship between vehicle speed and steering angle ratio;
The figure is a diagram showing how the steering angle applied to the rear wheels gradually decreases, and Figure 6 shows the relationship between the steering angle applied to the front wheels and the steering angle applied to the rear wheels over time. It is a line diagram. 1... Steering wheel, 2... Steering shaft, 3... Steering gear, 4...
Front wheel output shaft, 5...Natsukuru arm, 6...Front wheel, 7...Steering column, 8...Rudder angle sensor, 9...Rear wheel, 10...Housing, 11...
Rear wheel output shaft, 12... Force application point, 13... Knuckle arm, 14... Steering center, 15... Rack tooth, 16... Transmission shaft, 17... Pinion tooth, 18...
... Worm wheel, 19 ... Electric motor, 20
... Output shaft, 21 ... Worm, 22 ... Displacement sensor, 23 ... Vehicle speed sensor, 24 ... Controller, 2
5...Centering spring, 26...Seat plate,
27...Stepped portion, 28...Stop spring, 29...
... disc spring, 31 ... electromagnetic clutch, 32 ... rotation angle sensor.
Claims (1)
サと、軸方向に変位する事により後輪に舵角を付
与する後輪用出力軸と、この後輪用出力軸を軸方
向に亙り変位させる電動モータと、車速を検出す
る車速センサと、前記電動モータの回転駆動軸と
前記後輪用出力軸との間に設けられ、電気的に断
接するクラツチと、前記後輪用出力軸の変位に基
づいて後輪に付与された舵角を検出する変位セン
サと、前記舵角センサと車速センサとからの信号
に基づいて、前記電動モータへの通電及び前記ク
ラツチの断接を制御する制御器と、前記電動モー
タの発熱程度を求める検出手段とを有し、前記後
輪の操舵中心をこの後輪の着力点よりも車両の前
進方向後方に位置させると共に、前記後輪用出力
軸を車体に対し、軸方向に亙る若干の変位を自在
として弾性的に支持して成り、前記制御器が、前
記車速センサにより検出される車速が一定値以下
の場合にのみ、前記クラツチを繋いで、電動モー
タへの通電に基づく後輪への舵角付与を自在とす
る第一の機能と、前記検出手段により求められる
電動モータの温度が一定値を越えた場合で、且つ
後輪に舵角が付与されている場合に、この舵角を
徐々に減少させる第二の機能とを有する四輪操舵
装置。 (2) 請求項１に記載の四輪操舵装置に於いて、
制御器が、第二の機能を省略する代わりに、又は
第二の機能に加えて、車速が零となつてから一定
時間を経過した後で、且つ後輪に舵角が付与され
ている場合に、この舵角を徐々に減少させる第三
の機能を有する四輪操舵装置。[Scope of Claim for Utility Model Registration] (1) A steering angle sensor that detects the steering angle applied to the front wheels, a rear wheel output shaft that applies a steering angle to the rear wheels by displacing in the axial direction, and An electric motor that displaces a wheel output shaft in the axial direction, a vehicle speed sensor that detects vehicle speed, and a clutch that is provided between the rotary drive shaft of the electric motor and the rear wheel output shaft and that electrically connects and disconnects. and a displacement sensor that detects a steering angle applied to the rear wheels based on the displacement of the rear wheel output shaft, and energizing the electric motor based on signals from the steering angle sensor and the vehicle speed sensor. It has a controller for controlling engagement and disengagement of the clutch, and a detection means for determining the degree of heat generation of the electric motor, and the steering center of the rear wheel is located behind the point of application of force on the rear wheel in the forward direction of the vehicle. and the rear wheel output shaft is elastically supported with respect to the vehicle body so as to be freely slightly displaced in the axial direction, and when the vehicle speed detected by the vehicle speed sensor is below a certain value, the controller The first function is to freely apply a steering angle to the rear wheels based on energization of the electric motor by connecting the clutch only when the temperature of the electric motor determined by the detection means exceeds a certain value. and a second function of gradually decreasing the steering angle when the steering angle is given to the rear wheels. (2) In the four-wheel steering device according to claim 1,
When the controller, instead of omitting the second function or in addition to the second function, applies a steering angle to the rear wheels after a certain period of time has elapsed since the vehicle speed became zero. The four-wheel steering device has a third function that gradually reduces this steering angle.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990107999U JP2522903Y2 (en) | 1990-10-17 | 1990-10-17 | Four-wheel steering system |
| US07/754,738 US5295550A (en) | 1990-09-07 | 1991-09-04 | Four-wheel steering apparatus |
| DE4129658A DE4129658A1 (en) | 1990-09-07 | 1991-09-06 | FOUR WHEEL STEERING DEVICE |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990107999U JP2522903Y2 (en) | 1990-10-17 | 1990-10-17 | Four-wheel steering system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0467178U true JPH0467178U (en) | 1992-06-15 |
| JP2522903Y2 JP2522903Y2 (en) | 1997-01-22 |
Family
ID=31854759
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1990107999U Expired - Lifetime JP2522903Y2 (en) | 1990-09-07 | 1990-10-17 | Four-wheel steering system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2522903Y2 (en) |
-
1990
- 1990-10-17 JP JP1990107999U patent/JP2522903Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JP2522903Y2 (en) | 1997-01-22 |
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