Abstract
Like recent automatic transmission, our latest CVT is demanded to be lightweight and downsizing from standpoints of fuel efficiency improvement and collision safety. Its gears, shafts that support gear, bearings and case are smaller than conventional specification, and gears operate at higher mesh force than ever before. So we developed balanced tooth flank form to match load capacity and noise performance. We measured tooth stress in load condition using CVT to investigate relation between load and tooth deformation. Considering the relation of tooth deformation, we simulated tooth contact pressure in heavy load and transmission error in light load. As a result of the simulation we founded a balanced tooth flank form that could reduce tooth contact pressure and keep same level of transmission error. We verified these simulated results experimentally using CVT.
