| 摘要 |
PROBLEM TO BE SOLVED: To provide a work vehicle comprising a hydrostatic gear shift device in which a space part of a valve plate is prevented from being corroded by hydraulic oil emitted from a transfer groove of the valve plate toward the space part in the valve plate.SOLUTION: The block inside of a cylinder 47 in which a hydraulic pump A of a continuously variable transmission (HST) is mounted, the block inside of a cylinder 47 in which a hydraulic motor B is mounted and a port block 71 are connected, respectively, to form hydraulic closed circuits 66, 67. A valve plate 86 is provided which includes space parts 88, 89 for hydraulic closed circuit formation between the port block 71 and the blocks of both the cylinders 47, 47. The valve plate 86 includes a plurality of notches 84 to which oil spouted within the space parts 88, 89 of the valve plate 86 is abutted. Therefore, Energy of a jet stream is weakened by abutting the hydraulic oil with each other, and durability of the HST is improved equal to or more than the prior arts by preventing occurrence of cavitation which may occur when the hydraulic oil is abutted to wall surfaces of the space parts 88, 89. |
