the engine torque being divided by a differential gear for driving a pump and the engine output shaft

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Component parts, details, or accessories relating to, driven charging or scavenging pumps, not provided for in groups F02B33/00 - F02B37/00 > Drives of pumps (exhaust drives or combined exhaust and other drives F02B37/00); Varying pump drive gear ratio > Mechanical drives; Variable-gear-ratio drives (non-mechanical pump drives having variable gear ratio F02B39/08) > the engine torque being divided by a differential gear for driving a pump and the engine output shaft