PROBLEM TO BE SOLVED: To stabilize travel attitude of a work vehicle having a suspension mechanism by configuring the work vehicle so as to allow selection of a suspension form suitable for e.g. working conditions of a vehicle body.SOLUTION: In a vehicle body 4 provided with travel units 1 and 2, a travel power transmission shaft 6 is in a vertically freely slidable way in a travel power transmission case 5 transmitting driving force to the travel units 1 and 2, and a boss 7 including the travel power transmission shaft 6 in a bearing inclusion form. In the upper end part of the boss 7, an upper chamber 9 which surround the upper end part of the travel power transmission shaft 6 and the upper end part of a bearing member 8 is formed. In the upper chamber 9, an upper spring 10 urging downward the travel power transmission shaft 6 is arranged, and the upper side of a steering case 11 is provided in a vertically freely slidable way on the lower side of the boss 7. A lower chamber 13 is formed between the upper side of the steering case 11 and a bearing member 12 bearing the travel powder transmission shaft 6, and, in the lower chamber 13, a lower spring 14 which urges the travel power transmission shaft 6 and the steering case 11 downward is provided.COPYRIGHT: (C)2015,JPO&INPIT【課題】 サスペンション機構を有する作業車両について、車体の作業条件等に適したサスペンション形態を選択可能に構成し、走行姿勢を安定させる。【解決手段】 走行装置1,2を設けた車体4において、走行装置1,2に駆動力を伝動する走行伝動ケース5に走行伝動軸6を上下摺動自在に設け、走行伝動軸6を軸受け内装するボス7を設け、ボス7の上端部には、走行伝動軸6の上端部及び軸受部材8の上端部を囲う上部室9を形成し、上部室9には、走行伝動軸6を下方へ付勢する上部スプリング10を設け、ボス7の下部側に操向ケース11の上部側を上下摺動自在に設け、走行伝動軸6を軸受けする軸受部材12との間に下部室13を形成し、下部室13には、走行伝動軸6及び操向ケース11を下方へ付勢する下部スプリング14を設けて構成する。【選択図】 図3
