PROBLEM TO BE SOLVED: To rationally arrange a retractable cylinder mechanism and an arrangement of a check chain installed between a machine side and a lower link in a narrow space in order to carry out lateral movement.SOLUTION: In a tractor, lower links (12, 12) are movably installed in vertical and horizontal directions through link balls (16, 16) by fixing pins (18, 18) of horizontal axial centers in the rear lower part of a vehicle body (T) and one end of a retractable cylinder mechanism (20) is connected vertically rotatably around the axial center slantly crossing with the horizontal axial center of the fixing pins (18, 18) through the horizontal axis of the fixing pins (18, 18) to the near central sites in the lateral direction of the vehicle body (T) and the other end of the retractable cylindrical mechanism (20) is connected through a longitudinal axis (28a) to the halfway part of either one lower link (12) of right and left lower links, and check chains (24, 24) capable of freely adjusting the length are installed nearly parallel to the retractable cylindrical mechanism (20) on the inside of right and left lower links (12, 12).COPYRIGHT: (C)2010,JPO&INPIT【課題】左右移動を行うため、機体側とロアリンクとの間に設ける伸縮シリンダ機構の配置構成とチェックチェンの配置構成とを狭い空間に合理的に行わせる。【解決手段】ロアリンク(12,12)は車体(T)後下部の横軸芯の装着ピン(18,18)にリンクボール(16,16)を介して上下並びに左右方向に移動可能に設け、上記装着ピン(18,18)の横軸芯を通り車体(T)の左右略中心箇所に、この横軸芯と斜めに交差する軸芯周りに上下に回動自在に伸縮シリンダ機構(20)の一端を連結し、上記伸縮シリンダ機構(20)の他端を、前記左右ロアリンクのうち一方のロアリンク(12)の途中部に縦軸(28a)を介して連結し、前記左右のロアリンク(12,12)の内側に、前記伸縮シリンダ機構(20)と略平行に長さを調整自在のチェックチェン(24,24)を設ける。【選択図】 図3
