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Flex Connectors are intended for mitigating the relative movement of exhaust system components along the axis of the system arising from the thermal expansion due to intermittent engine operation. Flex connectors must not be installed in locations, where they will be subjected to destructive vibration. Hence, the stiffness of the flex connector plays an important role, while designing or selecting the right design. It consists of a multi-ply bellows combined with an inside and an outside steel braid. The liner is included to reduce the temperature of the bellows and improve flow conditions. The braid is included for mechanical protection and to limit the possible extension of the joint. It has only axial translational motion.

The main driving force behind recent innovations in automotive sector is the need to decrease the dependability on fossil fuels and move towards alternative sources for energy. While there is still substantial scope for improvement in conventional diesel and petrol engine based powertrains, the inherent dependency on limited and rapidly depleting carbon based fuels make their long term usage impractical highlighting the need for alternative non-conventional powertrain setups. In the recent past, electric powertrains have come out as favorable alternative as they are extremely flexible in adopting to scenarios where energy for use might be drawn from multiple sources such as solar power, hydroelectric, nuclear reaction, etc. The advantages can further be magnified by adopting the electric power based powertrains in mass transportation application such as bus application.