JPH0414502U

JPH0414502U -

Info

Publication number: JPH0414502U
Application number: JP5623190U
Authority: JP
Priority date: 1990-05-29
Filing date: 1990-05-29
Publication date: 1992-02-05
Anticipated expiration: 2005-05-29
Also published as: JP2509650Y2

Description

[Brief explanation of the drawing]

第１図は左右の車輪１Ｌ，１Ｒのトレツドが狭
い状態の平面図、第２図はトレツドを広くして、
左方向にハンドルを切つた状態の平面図、第３図
はトレツドを広くした状態の平面図、第４図は狭
くした状態のリンク位置を示す平面図、第５図は
本考案のトラクタのトレツド調節機構を操作する
油圧回路図である。１Ｌ，１Ｒ……車輪、２……アクスルケース、
３Ｌ，３Ｒ……伸縮アクスル、４，５……タイロ
ツドアーム、６……右旋回用アクチユエータ、７
……左旋回用アクチユエータ、Ｖ……トレツド調
節バルブ、Ｗ……操向操作切換バルブ、Ｓ……操
向ハンドル、Ｓｗ……旋回方向切換スイツチ。 Figure 1 is a plan view of the left and right wheels 1L and 1R with narrow treads, and Figure 2 is a plan view with the treads widened.
A plan view with the handle turned to the left, Fig. 3 is a plan view with the tread widened, Fig. 4 is a plan view showing the link position with the tread narrowed, and Fig. 5 shows the tread of the tractor of the present invention. FIG. 3 is a hydraulic circuit diagram for operating the adjustment mechanism. 1L, 1R...wheels, 2...axle case,
3L, 3R...Telescopic axle, 4, 5...Tie rod arm, 6...Right turning actuator, 7
...actuator for left turning, V...tread control valve, W...steering operation switching valve, S...steering handle, Sw...turning direction switching switch.

Claims

[Claims for Utility Model Registration] (1) A steering operation switching valve W that can be switched by turning the steering handle S to the right or left is provided, and the steering operation switching valve W supplies pressure oil to the steering operation switching valve W for right-handed rotation. A rotating actuator 6 and a left-turning actuator 7 are arranged side by side, and a tie rod arm 4 that rotates with the right-handed turning actuator 6 and a tie rod arm 5 that rotates with the left-turning actuator 7 are attached to the axle case 2 by a pivot shaft. Tie rods 13 and 9 are overlapped and pivotally supported at the front and rear ends of the tie rod arm 4, respectively.
The tie rods 11 and 14 at the front and rear ends of the tie rod arm 5 are pivotally supported at the front and rear ends of the knuckle arms 18L and 18R.
are pivoted by pivot parts 20L, 20R at the left and right ends of the telescopic axles 3L, 3R, and the telescoping axles 3L, 3R can be extended and contracted left and right with respect to the axle case 2, and the wheels 1L, 1R are supported on the knuckle arms 18L, 18R. A tread adjustment mechanism characterized by support. (2) A tread adjustment valve V is interposed between the left and right turning actuators 7 and 6 and the steering operation switching valve W according to claim (1), and the left and right turning actuators 7 and 6 are expanded and contracted in the same direction at the same time. A tread adjustment mechanism characterized in that the telescopic axles 3L, 3R are moved in and out of the axle case 2, thereby adjusting the treads of the wheels 1L, 1R.