British transmission company Zeroshift Ltd. has devised a multi-speed gearbox for electric vehicles that needs no clutch. A damper inside the gear hubs and electronic control of the motor make ratio changes seamless, the developer says. Having more than one gear ratio and the ability to shift without interrupting torque means the motor runs at higher efficiency, extending range and battery life expectancy up to 10%, the Milton Keynes-based company says. The innovation could allow ...

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