Renault's innovative E-Tech powertrain was born from Lego bricks
In 2010, during his holiday break, Renault's hybrid specialist, Nicolas Fremau, crafted a miniature transmission model using Lego's Technic pieces. Unbeknownst to him at the time, this small-scale model would later serve as the foundation for Renault's E-Tech hybrid system. The core of this hybrid powertrain is the transmission that Fremau designed, aptly named the LocoDisco Box.
Locodisco Box marked a break from conventional transmissions
The LocoDisco Box, distinguished by its vibrant yellow cross-braces, blue fasteners, and red, gray, and black cogs, deviates from the traditional friction clutches, found in standard automatic transmissions. Instead, Fremau's design employs highly efficient dog clutches. The term 'dog' is derived from the way the clutch's opposing teeth interlock, akin to a dog's jaw. This coupling method allows for quick engagement and disengagement.
From Lego model to full-scale prototype
Fremau's Lego model demonstrated potential for enhanced efficiency due to its quick cog changes and reduced friction. Just 18 months after finalizing his Lego design, Renault began testing the first fully functional full-size LocoDiscoBox prototype. This innovative system made its debut in the hybrid Clio E-Tech at the 2019 Geneva auto show.
E-Tech powertrain: Revolutionizing the hybrid car market
Since its debut, Renault has incorporated the E-Tech powertrain into several cars, bringing Fremau's Lego concept to life. It also redefines what it means to own a four-wheeler with a "bricked" gearbox. The plastic prototype also included a tiny electric motor as well as drive belts, allowing Fremau to showcase his concept in motion. This innovation is best exemplified in Renault's Austral E-Tech model.
Austral E-Tech: A real-world application of the E-Tech powertrain
Despite being equipped with a petrol engine, the E-Tech powertrain propels the Austral from standstill using only electric motor power. The hybrid model relies on a 1.7kWh battery pack that powers its 67hp drive motor. It requires careful handling to prevent triggering its 129hp inline-triple engine for assistance. The switch between power sources occurs seamlessly, and provides 15 gear combinations for various driving scenarios.
