Travelling transmission gear null of portable agricultural

摘要

PURPOSE:To provide the most suitable layout of a transmission member so as to reduce the weight and size of a transmission case by arranging a spin gear inside the transmission case in relation to a spin clutch. CONSTITUTION:A spin clutch 8 makes synchronized differential motion interlocking with the operation of a steering clutch gear 3 when it is turned by spin turn. A spin gear 7 disposed crosswise inside the spin clutch 8 is normally engaged with deceleration gear 5. The spin gear 7 and the spin clutch 8 are mutually integrated when the spin gear 8 is put in connection and rotational power on a counter gear 10 side is transmitted to the deceleration gear 5 through a gear 21 which is a reverse rotation mechanism. At this time, as the spin gear 7 is arranged to be positioned inside of a transmission case 12 in relation to the spin clutch 8, the engagement of the deceleration gear 5 with the spin gear 7 is performed in a center side position of the transmission case 12 and the lateral width of the transmission case 12 can be made smaller as compared with that when the spin clutch 8 is arranged inside and the spin gear 7 is arranged outside.