| 摘要 |
PURPOSE: To facilitate continuous shifting by connecting respective control gears in a planetary gear device to a rotor shaft in a braking pump and arranging a means discharging pressurized working fluid according to a rotational speed of a rear propeller shaft. CONSTITUTION: A sun gear 12 in a first planetary gear device 10 is fixed to a crank shaft 3 in an engine, and an internal gear 16 of the planetary gear device 10 is connected to a rotor 32 in a first braking pump 30, while an internal gear 26 of a second planetary gear device 20 is connected to a rotor 42 in a second braking pump 40. A sun gear 22 of the second planetary gear device 20 is installed to a rear propeller shaft 4, while a centrifugal pump 50 is arranged in the rear propeller shaft so as to detect its rotational speed and so as to discharge hydraulic fluid 65 pressurized according to the rotational speed. As the hydraulic fluid 65 lowers a piston head 512 against a spring 514 and lowers a valve element 516 so as to partially close an oil passage 408, so that an oil quantity in the second braking pump 40 is reduced and a rotational speed of the second internal gear 26 is lowered. That is, the planetary gear device 20 continuously provides a gear reduction ratio in compliance with a quantity of the hydraulic fluid 65. |
