Gearbox structure

A gearbox structure suitable for use in combination with a control unit and a power source, comprising:

• a housing comprising a first accommodation space, a second accommodation space and a partition wall, wherein the first accommodation space and the second accommodation space are separated by the partition wall;
• a transmission module arranged in the first accommodation space and comprising an input gear, at least one planetary shaft and an output shaft, wherein the input gear is combined with the power source, the at least one planetary shaft comprises an input-planetary gear and an output-planetary gear, the input-planetary gear and the output-planetary gear are arranged at two opposite ends, respectively, the input-planetary gear is meshed with the input gear, and the output- planetary gear is meshed with the output shaft;
• and
• a sensing module comprising at least one sensor accommodated in the second accommodation space, wherein the at least one sensor is disposed adjacent to the at least one planetary shaft through the partition wall, and located between the input-planetary gear and the output-planetary gear.