TRACTOR

• Main Authors: TANAKA TAKEJI, UCHIDA NAOKI, UCHIDA KEIZO, SUYAMA TOMONORI
• Format: Patent
• Language: English; Japanese
• Published: 25.06.2020
• Subjects: BLASTING; BRAKES; CLUTCHES; COUPLINGS FOR TRANSMITTING ROTATION; ENGINEERING ELEMENTS AND UNITS; GEARING; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; LIGHTING; MECHANICAL ENGINEERING; THERMAL INSULATION IN GENERAL; WEAPONS

To provide a tractor capable of reducing the number of components by eliminating a lever position detection switch which detects operation positions of main transmission shift lever and an auxiliary transmission shift lever.SOLUTION: A tractor T comprises: a control device 28 which moves a traveling machine body 1 in a forward or reverse direction through pressure control of a forward travel hydraulic clutch 12 or a reverse travel hydraulic clutch 13 according to operation of a forward-and-reverse travel switching lever 20; a forward-and-reverse operation detection switch 29 which detects the operation of the forward-and-reverse travel switching lever 20; a neutral operation detection switch 30; a reverse operation detection switch 31; and a speed sensor 35 which detects a speed of the traveling machine body 1. When the forward-and-reverse travel switching lever 20 undergoes travel direction switching operation, the control device 28 performs the pressure control of the forward travel hydraulic clutch 12 or the reverse travel hydraulic clutch 13 with a predetermined boosting pattern regardless of shift stages of a main transmission mechanism 9 and an auxiliary transmission mechanism 11.SELECTED DRAWING: Figure 5 【課題】主変速レバーや副変速レバーの操作位置を検出するレバー位置検出スイッチを不要にして部品点数を削減できるトラクタを提供する。【解決手段】前後進切換レバー２０の操作に応じて前進用油圧クラッチ１２又は後進用油圧クラッチ１３を昇圧制御して走行機体１を前進又は後進させる制御装置２８を備えるトラクタＴであって、前後進切換レバー２０の操作を検出する前進操作検出スイッチ２９、中立操作検出スイッチ３０及び後進操作検出スイッチ３１と、走行機体１の車速を検出する車速センサ３５と、を備え、制御装置２８は、前後進切換レバー２０が前進操作又は後進操作されたとき、主変速機構９及び副変速機構１１の変速段に拘わらず前進用油圧クラッチ１２又は後進用油圧クラッチ１３を所定の昇圧パターンで昇圧制御する。【選択図】図５