| 摘要 |
PURPOSE:To improve safety of a four-wheel working vehicle for farming use, etc. by constituting its wheel supporting structure in such a way that two oil chambers of a supporting mechanism for vertically movable wheels are communicated with each other when pressure in one of the oil chambers is above a specified value and are cut off when the oil pressure declines below the specified value. CONSTITUTION:Vertically movable wheels 1 are supported with 4-serial linking- type suspension linkage mechanisms 16a, 16b, which are in turn supported with oil pressure cylinders 17a, 17b. And oil chambers a, a of the two oil pressure cylinders 17a, 17b are connected with oil passages 19a, 19b equipped with relief valves 20a, 20b, which are opened with the oil pressure of a specified value, in reverse directions. Due to such constitution, if pressure in one of the oil chambers (a), (a) surpasses the specified value, the corresponding relief valve 20a or 20b is opened, resulting in the transfer of pressure oil. And if the pressure declines below the specified value, the opened relief valve comes to be closed. Accordingly, the vehicle can run safely even on unprepared or slanting grounds. |
