Method for lubricating a gearbox for a wind turbine

摘要

A method for lubricating a gearbox of a wind turbine. The gearbox comprises a plurality of gears and shafts supported by bearings of which at least one bearing is a plain bearing. The gearbox furthermore comprises a lubrication system with both a mechanical pump and an electrical pump for feeding the gears and bearings with lubricant, wherein a difference between a volume capacity of the mechanical and electrical pump is a maximum 40%. The method comprises the step of controlling at least one valve, during start-up of the gearbox, and feeding lubricant to the bearings via the electrical pump; feeding lubricant to the bearings and the gears, during normal operation of the gearbox, via the electrical pump and the mechanical pump; and feeding lubricant only the bearings, during the absence of electrical power supply, via the mechanical pump.

主权项

1. A method for lubricating a gearbox of a wind turbine in which the gearbox comprises a plurality of gears and shafts supported by bearings where at least one bearing is a plain bearing, and a lubrication system with a mechanical pump and an electrical pump for feeding the gears and the bearings with lubricant, and at least one valve which is arranged in the lubrication system downstream from the mechanical and the electrical pumps, wherein a difference between a volume capacity of the mechanical pump and the electrical pump is a maximum 40%, the method comprising the steps of:
actuating the at least one valve, with a control system, to a first position to prevent a flow of the lubricant to the gears and to direct the flow of the lubricant from the electric pump to the bearings, during start-up of the gearbox, actuating the at least one valve, with the control system, to a second position to direct the flow of the lubricant from the electric pump to the bearings and the gears and to direct the flow of the lubricant from the mechanical pump to the bearings and the gears, during normal operation of the gearbox, and actuating the at least one valve, with the control system, to the first position to prevent the flow of the lubricant to the gears and to direct the flow of the lubricant from the mechanical pump to the bearings, during absence of electrical power supply.