With energy eciency a hot topic, designing hybrid power plants for vehicles is growing in popularity and cost eectiveness. But the gearing necessary requires special consideration. We had a customer recently request a right angle spiral bevel gear design that was to be incorporated into a hybrid diesel/electrical power package to drive a bus. Much like a train power supply, the diesel engine was to drive a generator that supplied energy to electric motors that powered the vehicle. Designing a gear system to achieve this presented several challenges. The rst challenge is that diesel engines do not provide a smooth and consistent power supply, like that of a typical industrial electric motor. The piston action generates intermittent peak loads that transmit micro shocks and vibration to t

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