JPH0454776U

JPH0454776U -

Info

Publication number: JPH0454776U
Application number: JP9717990U
Authority: JP
Priority date: 1990-09-14
Filing date: 1990-09-14
Publication date: 1992-05-11

Description

[Brief explanation of drawings]

第１図〜第４図は本考案による四輪操舵装置の
一実施例を示し、第１図は要部の縦断面図、第２
図は第１図の−断面図、第３図は全体の概略
平面図、第４図は特性を示す図である。符号の説明、１０……前輪舵取装置、２０……
後輪舵取装置、２４……後輪パワーシリンダ、３
９……機械的伝達装置（連動軸）、４０Ａ，４０
Ｂ……伝達トルク制限機構、４１……入力回転部
材、４３……出力回転部材、４４……ばね（渦巻
ばね）、５０Ａ，５０Ｂ……サーボ弁、５１……
出力軸、５２……作動軸、６０……供給ポンプ、
７０……切換弁、Ａ……同相操舵部、Ｂ……逆相
操舵部。 1 to 4 show an embodiment of the four-wheel steering system according to the present invention, in which FIG. 1 is a longitudinal cross-sectional view of the main part,
The figures are a cross-sectional view taken from FIG. 1, FIG. 3 is a schematic plan view of the entire structure, and FIG. 4 is a diagram showing characteristics. Explanation of symbols, 10... Front wheel steering device, 20...
Rear wheel steering device, 24... Rear wheel power cylinder, 3
9...Mechanical transmission device (interlocking shaft), 40A, 40
B... Transmission torque limiting mechanism, 41... Input rotating member, 43... Output rotating member, 44... Spring (spiral spring), 50A, 50B... Servo valve, 51...
Output shaft, 52... Operating shaft, 60... Supply pump,
70...Switching valve, A...In-phase steering section, B...Reverse-phase steering section.

Claims

[Scope of utility model registration request]

A four-wheel steering device comprising: a front wheel steering device that steers a front wheel; and a rear wheel steering device that is connected to the front wheel steering device via a mechanical transmission device to steer the rear wheels; The steering device includes an in-phase steering section that steers the rear wheels in the same phase as the front wheels via the mechanical transmission device, an anti-phase steering section that steers the rear wheels in the opposite phase, and a rear wheel power cylinder that generates an assist force to steer the rear wheels. The in-phase and anti-phase steering sections each include an input rotating member rotated by the mechanical transmission device;
a servo valve that generates the assist force by controlling the supply and discharge of working fluid supplied from the supply pump to the rear power cylinder; and an input rotation member that is provided between the input rotation member and the operating shaft of the servo valve. If the torque generated between the input rotating member and the operating shaft is less than a predetermined value, the rotation of the input rotating member is transmitted to the operating shaft, but if the torque exceeds a predetermined value, the rotation between the input rotating member and the operating shaft is A transmission torque limiting mechanism having a spring that allows rotation of the target is separately provided, and a switching valve is further provided to selectively switch the working fluid supplied from the supply pump to each of the servo valves according to the running condition. Features a four-wheel steering system.