Multi-plunger pumps and associated drive systems

A hydraulic fracturing method comprising:

• by operation of a multi-plunger hydraulic fracturing pump of a hydraulic fracturing system, pumping fluid to a wellb ore associated with a subterranean formation, the multiplunger hydraulic fracturing pump comprising a pump crankshaft;
• powering the multi-plunger hydraulic fracturing pump with a plurality of motors;
• and
• translating power from the plurality of motors to the multi-plunger hydraulic fracturing pump through a planetary gear train, wherein translating power through the planetary gear train comprises translating power through:
• a plurality of input pinion gears that are driven by the plurality of motors;
• and
• a final drive gear that drives the pump crankshaft, wherein the final drive gear is connected to the pump crankshaft by a plurality of arms extending from the final drive gear.

A hydraulic fracturing system for fracturing a subterranean formation, the hydraulic fracturing system comprising:

• a plurality of electric motors;
• a planetary gear train connected to the plurality of electric motors, the planetary gear train comprising:
• a plurality of input pinion gears, each driven by a respective one of the plurality of electric motors;
• a main gear driven by the plurality of input pinion gears, the main gear comprising external gear teeth that mate with external gear teeth of the plurality of input pinion gears;
• a sun gear driven by the main gear and connected to the main gear by a shaft;
• planetary gears driven by the sun gear, the planetary gears each comprising external gear teeth that mate with external gear teeth of the sun gear;
• and
• a final drive gear driven by the planetary gears, the final drive gear comprising internal gear teeth that mate with the external gear teeth of the planetary gears;
• and
• a multi-plunger hydraulic fracturing pump that pumps fluid to a wellbore and comprises a pump crankshaft that is driven by the final drive gear of the planetary gear train, the final drive gear connected to the pump crankshaft by a plurality of arms extending from the final drive gear.