Patent ID: 8881617

Claim:
A robot arm comprising: a first shaft housing being hollow, the first shaft housing comprising a housing, a first mounting base and a second mounting base mounted on the housing; a first driving mechanism mounted on the first mounting base of the first shaft housing, the first driving mechanism comprising a first driving assembly and a first transmission assembly fixed to the first driving assembly, the first transmission assembly being fixed to the first mounting base, the first driving assembly being configured to drive the first mounting base to rotate via the first transmission assembly; a second driving mechanism mounted on the second mounting base of the first shaft housing, the second mechanism comprising a second driving assembly and a second transmission assembly fixed to the second driving assembly, the second transmission assembly being fixed to the second mounting base, the second driving assembly being configured to drive the second mounting base to rotate via the second transmission assembly, the second transmission assembly comprising a third gear fixed to the second driving assembly, a fourth gear meshing with the third gear, and a speed reduction assembly fixed to the fourth gear, the speed reduction assembly being fixed to the second mounting base, an axis of the speed reduction assembly overlapping with the axis of the second mounting base; a cable pass-through assembly received within the first shaft housing, comprising a first cable tube passing through the first driving mechanism and the first mounting base, and a second cable tube passing through the second driving mechanism and the second mounting base, the first cable tube passing through the first transmission assembly, and the second cable tube passing through the second transmission assembly; and a cable assembly electrically connecting with the first driving assembly and the second driving assembly; wherein an axis of the first cable tube overlaps with an axis of the first mounting base; an axis of the second cable tube overlaps with an axis of the second mounting base; the cable assembly passes through the first cable tube and the second cable tube; the first driving mechanism drives the first mounting base to rotate, and the second driving mechanism drives the second mounting base to rotate, the second cable tube passes through the speed reduction assembly.