Analysis of Transmission Errors and Load Sharing of Compound Stepped Planetary Gear Drives Considering Mesh Phasing

The compound stepped planetary gear (CSPG) drive has a higher speed ratio than simple planetary gear drives, but the selection of gear teeth for CSPG drives is more stringent due to their complex structure. Based on the involute geometry, a gear mesh analysis model is developed. From this model, the essential conditions for correct assembly of CSPG set and design guidelines are proposed. Under consideration of eccentric of carrier, the general equations of contact positions and clearance of CSPG set are derived. Based on the relations of loaded deformation and displacement, the influence of mesh phases on loaded transmission error and load sharing among planets is discussed. Four study cases are chosen for influence analysis of the meshing phases on transmission errors and load sharing.