The present invention relates to a shifting mechanism improvement of a cultivating machine, which is an upright shifting mechanism installed under the engine of the cultivating machine, which comprises a relatively locking upper and lower housing, and is well-equipped The innovative planetary gear set, the toothed disc and the C-ring are used as the transmission of the shifting gear. When the grip mounted on the tilling machine is gripped, the direct shifting output is output to the drive shaft, and the effect of the high torque power output is obtained. The output of the drive shaft of the present invention is combined with the transmission gear box, and can be used in various types of farming tools, and is widely used and practical.本創作係關於一種耕耘機之變速機構改良，為裝設在該耕耘機之引擎下方的一種直立式變速機構，其包含有相對鎖合的一上殼座和一下殼座，且內包含有精良獨具創新的行星齒輪組、齒盤、C型環，作為變速的傳動裝置，當裝設在耕耘機上的握柄在握緊時，直接變速輸出到傳動軸，獲致大扭力動力輸出的成效，本創作之傳動軸的輸出結合傳動齒輪箱，可搭各種型態的農耕工具，運用廣又實用。
