The　contact　force　of　a　cycloid　pin　plays　a　significant　role　in　the　transmission　accuracy　and　fatigue　life　of　an　RV　reducer.　The　dynamic　multi-tooth　meshing　process　of　the　RV　reducer　is　investigated　in　this　study.　First,　the　dynamic　simulation　model　of　the　RV　reducer　was　established.　Then,　the　normal　contact　force,　friction　force,　and　contact　stress　at　the　meshing　point　of　each　cycloid　pin　were　determined　by　simulation.　Subsequently,　the　contact　force　calculated　by　the　theoretical　formula　was　compared　with　that　obtained　by　the　simulation.　Finally,　the　transmission　performance　of　the　RV　reducer　prototype　was　tested.　The　results　showed　that　the　cycloidal　drive　is　the　main　cause　of　the　transmission　error　of　the　RV　reducer.　The　standard　deviation　component　of　the　transmission　error　of　the　RV　reducer　can　indirectly　determine　the　match　of　the　cycloid　pin　in　different　meshing　positions.　Thus,　the　transmission　accuracy　of　the　RV　reducer　can　be　further　improved　through　targeted　tooth　profile　modification.　©　2020,　Editorial　Department　of　Journal　of　HEU.　All　right　reserved.