IEC 61400-4:2012（E）适用于额定功率超过500 kW的水平轴风力涡轮机传动系的封闭式增速齿轮箱。本标准适用于安装在陆上或海上的风力涡轮机。本标准提供了与齿轮和齿轮箱元件设计相关的风力涡轮机载荷分析指南。本标准涵盖的齿轮传动元件包括正齿轮、斜齿轮或双斜齿轮，以及它们在主动力路径中的平行组合和行星轮系。该标准基于变速箱设计，使用 滚动轴承。还包括轴、轴毂接口、轴承和齿轮箱结构的工程设计指南，用于开发完全集成的设计，以满足苛刻的操作条件。变速箱的润滑包括原型和生产测试。最后，对齿轮箱的操作和维护提供指导。

IEC 61400-4:2012(E) is applicable to enclosed speed increasing gearboxes for horizontal axis wind turbine drivetrains with a power rating in excess of 500 kW. This standard applies to wind turbines installed onshore or offshore. It Standard provides guidance on the analysis of the wind turbine loads in relation to the design of the gear and gearbox elements. The gearing elements covered by this standard include such gears as spur, helical or double helical and their combinations in parallel and epicyclic arrangements in the main power path. The standard is based on gearbox designs using rolling element bearings. Also included is guidance on the engineering of shafts, shaft hub interfaces, bearings and the gear case structure in the development of a fully integrated design that meets the rigours of the operating conditions. Lubrication of the transmission is covered along with prototype and production testing. Finally, guidance is provided on the operation and maintenance of the gearbox.