JPS63202524U - - Google Patents

Description

【図面の簡単な説明】[Brief explanation of the drawing]

図面は本考案に係る四輪駆動型作業車の実施例
を示し、第１図はパワーステアリング用の複動型
油圧シリンダと前輪変速装置との連係状態を示す
図、第２図はリミツトスイツチ付近の平面図、第
３図は前輪変速装置の縦断側面図、第４図は農用
トラクタの全体側面図である。 １…前輪、１０…前輪変速装置、２０…制御装
置、２１…複動型油圧シリンダ、２２ａ，２２ｂ
…ピストンロツド、２３，２４…架橋部材、３０
…センサー。 The drawings show an embodiment of the four-wheel drive type work vehicle according to the present invention, and FIG. 1 shows the state of connection between the double-acting hydraulic cylinder for power steering and the front wheel transmission, and FIG. A plan view, FIG. 3 is a longitudinal sectional side view of the front wheel transmission, and FIG. 4 is an overall side view of the agricultural tractor. DESCRIPTION OF SYMBOLS 1... Front wheel, 10... Front wheel transmission, 20... Control device, 21... Double-acting hydraulic cylinder, 22a, 22b
...Piston rod, 23, 24...Bridging member, 30
…sensor.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 操向自在な前輪１への伝動系に、後輪駆動速度
と略等しい駆動速度で伝動する標準駆動状態と、
後輪駆動速度より大きい駆動速度で伝動する増速
駆動状態とに切換える前輪変速装置１０を備える
と共に、前記前輪１の設定角度以上の操向操作に
より、前輪変速装置１０を増速駆動状態側に切換
操作する制御装置２０を備えてある四輪駆動型作
業車であつて、パワーステアリング用の複動型油
圧シリンダ２１から左右にピストンロツド２２ａ
，２２ｂを突出延出し、前記両ピストンロツド２
２ａ，２２ｂの各々を左右前輪１のナツクルアー
ム２６に連係させると共に、前記複動型油圧シリ
ンダ２１左右から突出した両ピストンロツド２２
ａ，２２ｂ部位に亘つてブリツジ状の架橋部材２
３，２４を架設し、前記架橋部材２３，２４の基
準位置からの設定以上の横移動を電気的に検出し
前記制御装置２０に伝達するセンサー３０を備え
てある四輪駆動型作業車。 a standard drive state in which the transmission system to the steerable front wheels 1 transmits power at a drive speed substantially equal to the rear wheel drive speed;
The front wheel transmission 10 is equipped with a front wheel transmission 10 that switches to an increased speed drive state in which transmission is performed at a drive speed greater than the rear wheel drive speed, and the front wheel transmission 10 is switched to the increased speed drive state by a steering operation of the front wheels 1 at a set angle or more. It is a four-wheel drive type work vehicle equipped with a control device 20 for switching operation, and piston rods 22a are installed on the left and right from a double-acting hydraulic cylinder 21 for power steering.
, 22b protrude and extend, and both the piston rods 2
2a and 22b are linked to the knuckle arms 26 of the left and right front wheels 1, and both piston rods 22 protrude from the left and right sides of the double-acting hydraulic cylinder 21.
A bridge-shaped bridging member 2 extends over the a and 22b portions.
3 and 24, and is equipped with a sensor 30 that electrically detects lateral movement of the bridging members 23 and 24 from a reference position beyond a set value and transmits the detected lateral movement to the control device 20.