Author(s): Satya Shanker M and Sunil Kumar K

Abstract: Success of a vehicle depends to a great extent upon the performance of actuator, which is one of the critical elements. Fuel control valves are used in engines to control the fuel to oxidizer mixture ratio. The valve is actuated through a rotary electro-mechanical actuator. The rotary actuator consists of DC motor as its prime mover, planetary gear box for torque multiplication and a sensor for feedback. Planetary gear train is used, to have a gear box of compact size and minimum inertia. In order to reduce the frictional losses and increase the actuator life, all gears of the planetary gear train are supported on deep groove ball bearings. For the development of electro-mechanical actuators, the key areas include electronics, failure detection and monitoring techniques, and reliability. In this work, reliability prediction of deep groove ball bearings is carried out, by applying appropriate failure rate models. The reliability of bearings is predicted to provide the measure of component performance to meet the system requirements.

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