| 摘要 |
PURPOSE:To simplify the mechanism of a speed change steering device by providing four sets of planetry gear devices including a pair of hydraulic units and two sets of planetry gear devices to accomplish arbitrary stepless speed change operation. CONSTITUTION:There are provided two sets of hydraulic pump motor units comprising a variable-capacity hydraulic pump driven by an input shaft 1 and a constant-capacity hydraulic motor connected to the above pump by a closed circuit. One set of pump motor unit 13, 14 is used for changing speed, and the other set of pump motor unit 36, 37 is used for steering. Sun gears of the third and fourth planetry gear devices 26, 27 are connected to each other, and connected to an output shaft of the speed change hydraulic pump motor 13, 14 through a shaft 29 and a gear, and a ring gear is connected to a carrier of the first planetry gear device 19 through a member 28. A carrier 27b is connected to a carrier of the second planetry gear 22 through a shaft 25. |
