| 摘要 |
<p>PROBLEM TO BE SOLVED: To solve a problem that, in a conventional axle drive unit of a working vehicle in which an oil sump for storing lubrication oil is arranged at a lower part of a transmission case, the agitation of the lubrication oil becomes intensive when all of power transmission shafts or the like up to an axle are immersed into the oil sump, and for avoiding the intensive agitation, a non-immersed power transmission shaft is arranged at an upper part higher than an oil level, however, the durability of the non-immersed power transmission shaft and its surrounding region to be lubricated is significantly deteriorated.SOLUTION: In a power transmission shaft which is pivotally supported at inside faces 56e and 57e of a case main body 56 and a lid body 57 at both sides constituting a transmission case 17, or in the case main body 56 and the lid body 57, there are arranged a shaft 64 or the like at an upper part higher than an oil level 153a of an oil sump 153, and a return oil passage 189 for returning lubrication oil in a hydraulic continuously variable transmission 19 attached to an outside face of the case main body 56 to the oil sump 153. The return oil passage 189 is integrally constituted of the inside face 56e of the case main body 56, and the lubrication oil in the oil passage can be supplied to the shaft 64 or the like and its surrounding gear 76 or the like.</p> |
