JPH01125267U

JPH01125267U -

Info

Publication number: JPH01125267U
Application number: JP2158988U
Authority: JP
Priority date: 1988-02-19
Filing date: 1988-02-19
Publication date: 1989-08-25

Description

[Brief explanation of the drawing]

第１図はこの考案の一実施例による４輪操舵機
構の後輪制御機構の構成を示す平面図、第２図、
第３図、第４図は本実施例の４輪操舵機構の全体
構成を示す平面略図であり、第２図はハンドルを
回転する前の状態、第３図はハンドルの回転角が
所定値以下の場合の状態、第４図はハンドルの回
転角が所定値を越える場合の状態を示す図である
。１……ステアリングシヤフト、２……ピニオン
、３……ラツク、４ａ，４ｂ……溝孔、５ａ，５
ｂ……圧縮ばね、７ａ，７ｂ……ロツド、９……
回転板、１１……タイロツド。 FIG. 1 is a plan view showing the configuration of a rear wheel control mechanism of a four-wheel steering system according to an embodiment of the invention; FIG.
Figures 3 and 4 are schematic plan views showing the overall configuration of the four-wheel steering mechanism of this embodiment. Figure 2 shows the state before the handle is rotated, and Figure 3 shows the handle when the rotation angle is below a predetermined value. FIG. 4 is a diagram showing a state in which the rotation angle of the handle exceeds a predetermined value. 1...Steering shaft, 2...Pinion, 3...Rack, 4a, 4b...Slot hole, 5a, 5
b...Compression spring, 7a, 7b...Rod, 9...
Rotating plate, 11...Tie rod.

Claims

[Scope of utility model registration request]

In a four-wheel steering mechanism that simultaneously steers the front and rear wheels of a four-wheeled vehicle, a rack 3 is provided which extends in the left-right direction and meshes with a pinion 2 attached to the rear end of a steering shaft 1 that transmits rotation of the steering wheel. A rotary plate 9 is provided at the rear of the rotary plate 9, and a tie rod 11 installed between the knuckle arms of both rear wheels is connected to the rear end of the rotary plate 9 at the center so that it moves in the left and right direction as the rotary plate 9 rotates. Slots 4a and 4b extending in the longitudinal direction are formed on both sides of the rack 3 sandwiching the pinion 2, and a pair of rods 7a and 7b are provided at their front ends in the slots 4a and 4b.
The slots 4 are pressed against the outer ends by compression springs 5a, 5b and are movable within the slots 4a, 4b.
a, 4b, and their respective rear ends are narrowed toward the rear before the rack 3 moves, and when the rack 3 moves to the right by a predetermined amount, the left rod 7b moves forward and backward. The right rod 7a is connected to both the left and right ends of the rotary plate 9 so that when the rack 3 moves leftward, the right rod 7a extends in the front and rear directions. A rear wheel control mechanism is provided which changes the direction of rotation of the rotary plate 9 depending on whether the moving distance of the rack 3 is below the predetermined value or exceeds the predetermined value. , the above predetermined value is set as the boundary value between the travel distance of rack 3 when driving at low speed and the travel distance of rack 3 when driving at high speed, and the front wheels and rear wheels are turned in opposite directions when driving at low speed and when driving at high speed. A four-wheel steering mechanism that is characterized by steering the wheels in the same direction when driving.