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Mercedes In-Drive moves braking system inside EV’s electric motor

By
Joe Lennert
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0


  • Mercedes In-Drive system mounts the brakes to the electric motor
  • In-Drive is a friction-based braking system
  • Mercedes has In-Drive in active testing, hasn’t given a timeline for production

Mercedes-Benz is rethinking how the braking system works, and where it’s located, in upcoming EVs.

In Germany last week, Mercedes-Benz engineers showed Green Car Reports one of its latest innovations dubbed In-Drive. It’s a system that relocates the entire braking system from inside the wheels to inside an EV’s electric motor housing.

The automaker didn’t commit to when, or which vehicle, the system might debut on and go into production, but it said the feature is already in active testing.

Mercedes-Benz In-Drive brake system

Referred to internally as “the brake of the future,” the In-Drive system is still a friction-based brake system that consists of a water-cooled brake disk that isn’t exposed to air. Mercedes engineers said they are still experimenting with different fluids. They want a lot of water in the unit to dissipate the heat, but they don’t want a giant radiator to assist. Completely enclosed, the brake discs reside on both sides of the electric motor.

Mechanical braking in EVs is only needed about 2% of the time while 98% of braking situations can be handled by regenerative braking, according to Mercedes engineers.

The new regenerative braking system in the 2026 CLA-Class, which will be the first EV on the automaker’s next-gen MMA platform, is capable of up to 200 kw of recuperation, according to Mercedes. The current EQS—a heavier car—is capable of up to 290 kw of recuperation, a Mercedes engineer said.

Mercedes-Benz In-Drive brake system

Mercedes-Benz In-Drive brake system

The Mercedes team said In-Drive is designed to be a lifetime system good for about 15 years and 186,400 miles (300,000 km), given it would theoretically only be engaged 2% of the time. Today’s brake pads only cover a small percentage of the brake disc, but the In-Drive system’s pads cover the entire surface area of the disc, which results in less force being used.

The In-Drive braking system could be mounted on a front axle that’s devoid of an electric motor, but the system would still sit in the center of the car and axle rather than by the wheels like today’s brakes.

Moving the brakes inboard shifts the weight to the center of the car and creates less unsprung mass, which will result in better handling.

By enclosing the brakes fully there’s no brake dust particulates and the wheels can be closed off to be more aerodynamic.

Mercedes-Benz paid for travel and lodging along with some German pretzels for Green Car Reports to bring you this firsthand report



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Dealer laws are “as close as you can get to corruption”

By
Joe Lennert
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0


  • Rivian CEO RJ Scaringe pointed to a “horrific state-by-state level of rules”
  • Dealers’ lobbying efforts have made it hard for Rivian to interact directly with customers
  • Rivian’s aware it has a service backlog, views it as a short-term problem

Rivian CEO RJ Scaringe isn’t a fan of U.S. dealership franchise laws. These laws work against the EV maker, which has a direct-sales model rather than franchised dealers.

On Wednesday during a roundtable with Green Car Reports and other media Scaringe said “we have this horrific state-by-state level of rules that are as close as you can get to corruption.”

The CEO was referring to franchise laws for car dealers, which are widely protected by heavy lobbying efforts.

“You essentially have lots of dealers that paid for lots of laws that make it really hard for us to interact directly with the customer,” Scaringe said. 

Scaringe had been asked whether, after VW’s recent investment of $5.8 billion into Rivian, the U.S. EV maker might be able to leverage the dealer network of one of the world’s largest automakers.

Rivian’s CEO then noted with an upbeat smile that “Europe doesn’t have the same rules,” and “there’s certainly opportunities there.” Rivian plans to sell both the smaller upcoming R2 and R3 crossover SUVs in Europe, but the R1T and R1S are deemed too large for that market.

“Service is the bigger thing,” continued Scaringe. “You don’t need 5,000 retail location in the U.S. to sell 3 or 4 million cars a year. Tesla’s a good example,” he said.

“You do need a lot of service infrastructure,” Scaringe went on to say. But even that’s changing because historically a customer needed to go into a dealer anytime a car made a clicking noise.

Often, depending what is needed, that service can come to you. Rivian handles more than half of its service with its in-house mobile service crews going to customers rather than customers coming to them.

Scaringe admitted the automaker has a service backlog in the U.S., as it tries to build as much service infrastructure as fast as it can. But in some U.S. markets the product is scaling faster than the automaker can build out the infrastructure.

“That’s a short-term anomaly,” Scaringe said. Long-term the executive said the team believes it’s going to build a robust service infrastructure.

In Europe, Scaringe said there’s a question whether Rivian partners with someone for service. “It’s certainly an opportunity,” he added.

But in America, with the franchise laws, the possibility of Rivian partnering with anyone else for service would be complicated.



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