PROBLEM TO BE SOLVED: To provide an autonomous travel vehicle in which a displacement amount of a cover in a horizontal shaft direction can be set to become large, and noise due to vibration of the cover in traveling time can be reduced.SOLUTION: A suspension mechanism 76 for attaching a cover 12b to a chassis 12a so as to be freely displaced, comprises: a shaft body 80 arranged between the chassis and the cover a guide 84 composed of a plate body part 82 provided on a lower half part of the shaft body, and first and second plate bodies 84a, 84b each of which is arranged on a vertical position of the plate body part so as to come into contact with the plate body part, and has an open hole into which the shaft body is inserted, provided at a center part a compression spring 86 formed in a truncated cone shape, whose upper bottom edge part is attached to an upper half part of the shaft body, whose lower bottom edge part is attached to the surrounding of the open hole provided in a cover for energizing the cover to the chassis and an elastic member 90 formed in a truncated cone shape, and arranged with the shaft body inserted into an open hole provided at a center thereof, in which the cover is formed into a truncated cone shape corresponding to the elastic member.SELECTED DRAWING: Figure 4【課題】カバーの水平軸方向への変位量を大きく設定できると共に、走行時のカバーの振動による騒音を低減できるようにした自律走行車両を提供する。【解決手段】シャシ12aにカバー12bを変位可能に取り付けるサスペンション機構76が、シャシとカバーの間に配置される軸体80と、その下半部に設けられる板体部82と、板体部の上下位置に板体部に当接可能配置されると共に、中央に軸体を挿通させる貫通孔がそれぞれ穿設される第1、第2板体84a,84bとからなるガイド84と、円錐台形状を呈すると共に、上底縁部が軸体の上半部に、下底縁部がカバーに穿設された貫通孔の周辺に取り付けられてカバーをシャシに向けて付勢する圧縮ばね86と、円錐台形状を呈し、軸体を中央に穿設された貫通孔に挿通させて配置される弾性部材90を備えると共に、カバーは弾性部材に相応して円錐台形状に形成される。【選択図】図4
