本标准涵盖直角齿轮传动装置，该装置用作将内燃机、汽轮机或实心轴电动机等原动机连接至立轴涡轮泵的动力传输装置

This standard covers right angle gear drives which are used as power transmission units for connecting prime movers such as internal-combustion engines, steam turbines, or solid shaft electric motors to vertical shaft, turbine-type pumps