When the traveling speed of the track vehicle is reduced to the speed corresponding to the second gear speed of the shift stage by the regeneration brake, the fourth clutch 47 is released at once and the second middle shaft 42 and the second shift gear stage 52 are rotation-synchronized by operation at an electric motor mode of the power generation motor 18. In the state that a fixed clutch 61 is fastened, rotation of the second middle shaft 42 is inputted to a power generation motor 18 through a differential mechanism 55 and regeneration action in the fourth gear speed. SOLUTION: When braking is applied at high speed traveling of the track vehicle, rotation of an output shaft 45 is transmitted to a second middle shaft 42 through a fourth shift gear stage 54 shifted and fastened with a fourth clutch 47. Abstract: PROBLEM TO BE SOLVED: To provide a drive system for a track vehicle capable of obtaining the maximum regeneration brake according to a traveling speed at braking.
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