During operation, gearboxes generate heat due to friction in the gears, bearings, and lubrication system. If this heat is not properly controlled, it reduces the oil viscosity, accelerates wear, decreases efficiency, and leads to premature failures. Especially in high-power and heavy-duty gearboxes, cooling systems with fans, coils, and heat exchangers play a critical role.
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Natural Cooling The housing surface provides passive cooling by dissipating heat to the surrounding environment. It is sufficient for small and medium-power gearboxes. Advantage: Does not require additional equipment and is cost-effective. |
Housings with Increased Surface Area Heat transfer is increased by cooling fins added to the housing. Application: Medium-power gearboxes operating continuously. |
External Fan Cooling Air circulation is provided by a fan connected to the shaft end. Advantage: Provides more effective cooling than natural cooling.
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Oil Circulation Cooling Oil is circulated by an oil pump, and heat is transferred outward. It is supported by external oil filters and cooling systems. Application: Heavy industry and high-torque applications. |
Coil Cooling Systems Cold water or oil passes through coil tubes placed in the gearbox housing or oil reservoir. Advantage: Reduces oil temperature quickly and in a controlled manner. Application: Cement, iron and steel, and continuous process industries. |
Heat Exchanger Cooling Systems Oil is cooled with water through plate or tubular heat exchangers. Advantage: Continuous and stable temperature control, longer oil life. Application: Power plants, mining, heavy industry. |
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Oil temperature should not exceed 90 °C. |
Periodic cleaning should be carried out in coils and heat exchangers against the risk of clogging. |
Oil level indicators, temperature sensors, and pressure gauges should be checked regularly. |
If the operating environment is hot, systems with additional fans or water cooling should be preferred. |
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Remak Academy’s Comment:“Keeping temperature under control in gearboxes not only extends the life of the lubricant, but also the life of gears and bearings. Systems with coils and heat exchangers provide maximum reliability in heavy-duty applications.” |
