| 摘要 |
PURPOSE:To restrict an occupation space in the radial direction of a power transmission shaft by collecting a hydraulic clutch and planetary gear mechanism on the same power transmission shaft, in the case of the change gear of a tractor, etc. CONSTITUTION:A change gear parallelly provides, in the shaft center direction on one power transmission shaft 5, a reciprocal planetary gear mechanism 21 consisting of a carrier 16 parallelly pivoting a pair of planetary gear 18A and 18B, a first sun gear 19 integrated with a power transmission shaft 5 and a second sun gear 20 loosely engaged herewith, and hydraulic clutches 34A and 34B. And the carrier 16, a clutch casing 26 and the second sun gear 20 are integrally rotated when the first hydraulic clutch 34A is operated, and the large diameter planetary gear 18A rotates the power transmission shaft 5 together with the sun gear 19 in the same direction as that of the carrier 16, so the forward condition appears. On the other hand, the casing 26, a mission case 22 and the sun gear 20 are united in a body when the second hydraulic clutch 34B is operated, so the backward condition appears. Thus, the occupation space in the radial direction of the power transmission shaft can be restricted. |
