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AssigneeMoventas Gears Oy
InventorsKari UUSITALO, Jukka ELFSTRÖM
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A gear unit comprises shafts for connecting to an external mechanical system, at least one gear stage between the shafts, a lubrication pump for circulating lubricating oil through the at least one gear stage and bearings of the gear unit, a temperature sensor for measuring temperature of the lubricating oil and supplying a temperature signal, an electrical motor for driving the lubrication pump, and an electrical device for controlling the electrical motor so that torque directed to the lubrication pump is below a torque limit. The torque limit is determined dynamically on the basis of the measured temperature of the lubricating oil. This arrangement makes it possible to protect the lubrication pump against mechanical faults during a cold start process so that an unnecessarily strict torque limitation, which would slow down the cold start process, can be avoided.
A gear unit comprising:
A method for controlling a lubrication pump of a gear unit, the method comprising:
A non-volatile computer readable medium encoded with a computer program for controlling a lubrication pump of a gear unit, the computer program comprising computer executable instructions for controlling a programmable processor to deliver a torque limit to an electrical system driving the lubrication pump, the torque limit indicating the maximum allowable torque directed to the lubrication pump, wherein the computer program further comprises computer executable instructions for controlling the programmable processor to change the torque limit in response to changes of a signal representative of measured temperature of lubricating oil.
Dependencies are inferred from the claim text.