| 摘要 |
PROBLEM TO BE SOLVED: To provide the traveling aid hydraulic circuit of the hydraulic drive working vehicle of high wide use capable of composing the traveling aid circuit during high speed traveling by means of the hydraulic pump and the hydraulic motor of a small capacity in small size regardless of the type of a traveling HST circuit (close type or open type, or the number of pumps and motors). SOLUTION: The hydraulic drive working vehicle is provided with traveling pumps 3, 3A driven by an engine 1 and a traveling HST circuit 2 having traveling motors 5, 5A driven by the traveling pumps 3, 3A. The output torque of the traveling motors 5, 5A is transmitted to a drive wheel 8 through a reducer 6. In this case, an aid pump 4 driven by the engine 1, and an aid motor 13 for adding torque produced to be driven by the aid pump 4 to the reducer 6 so as to be output to output torque of the traveling motors 5, 5A. The traveling HST circuit 2 may be an open circuit or a close circuit. |
