German automaker Mercedes-Benz has introduced a more efficient braking system for electric vehicles (EVs). The concept, dubbed “In-Drive Brakes,” relocates the braking system from the wheels to the electric motor itself. Positioned at the connection point of the half-shafts, this innovative design integrates the braking mechanism directly into the motor assembly. For more news and articles about innovations in the automotive sector, visit Root-Nation.com – a website about gadgets, technology and cars.
Electric vehicles rely on regenerative braking for 98% of their deceleration needs, but friction brakes remain essential for the remaining 2%, particularly during critical stops that demand high braking power. In emergency situations, a full stop may require up to 2200 kW of power, while regenerative braking typically delivers up to 290 kW. However, because friction brakes are seldom used, their rotors often rust, leading to brake dust, increased noise, and reduced effectiveness over time.
While the prototype showcases this approach on the rear axle, the design has the potential to be implemented on both the front and rear axles.
According to Mercedes representatives, this innovation offers improved ride quality, cleaner streets by containing brake dust, and streamlined wheel designs that enhance aerodynamics. Unlike traditional disc brakes, the In-Drive Brakes operate similarly to a clutch system in manual transmissions. For electric vehicles, the rotating disc mounted on the half-shaft provides a cleaner, more integrated, and efficient braking solution.
The proposed braking system replaces conventional disc brakes with a design reminiscent of a manual transmission clutch. Two stationary plates, akin to a flywheel, flank the rotating disc, and a circular hydraulic cylinder compresses the assembly. This causes the friction disc to press against the stationary plates, slowing the vehicle’s motion.
To dissipate heat generated during braking, the system uses stationary, liquid-cooled plates housed entirely within casings at the motor’s ends. Each brake housing includes a reservoir designed to collect brake dust, ensuring efficient operation throughout the vehicle’s lifespan.
According to Mercedes representatives, eliminating the need for air ducts for cooling, this enclosed design ensures silent operation, keeps wheels clean, reduces unsprung weight, and allows for greater flexibility in wheel design.
The concept works well with front-motor configurations or even vehicles without in-wheel motors, making it an appealing option for electric vehicles, provided its cost remains comparable to traditional braking systems. Some car reviews can be found here.
The system complements the cutting-edge advancements of Mercedes’ Future Technologies Lab, offering a quiet, efficient, and low-maintenance solution. Experts are eager to see this innovative approach implemented in future vehicle models, as it holds the potential to significantly transform braking systems.
Mercedes claims that the In-Drive Brake system is designed to last the entire lifespan of the vehicle without requiring maintenance, potentially saving owners thousands of dollars on brake repairs and replacements. The brake dust is collected in a sealed compartment that never needs to be emptied.
