Material Selection
Drive shafts must be manufactured from materials that can withstand corrosion, stress, and constant rotation. Common choices include stainless steel and high-strength alloys. For vertical turbine pumps, line shaft bearings are often water-lubricated to protect against friction and wear.
Length and Alignment
Especially in vertical turbine pumps, the drive shaft may extend several meters. Proper straightness and alignment are critical to prevent vibration.
Coupling Design
Drive shafts are usually connected through flexible or rigid couplings. Flexible couplings can absorb slight misalignments, while rigid couplings provide precise torque transfer.
Bearings and Lubrication
Bearings support the shaft along its length, keeping it aligned and reducing friction. Water-lubricated or grease-lubricated bearings are chosen based on installation conditions.
Torsional Strength
The shaft must withstand the torque generated by the driver, especially in diesel engine fire pumps where sudden load changes may occur.
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