Toyota is continuing its push into innovative electric vehicle (EV) technology with a new patent filing for in-wheel electric motors. This development indicates that the automaker is still actively working on this cutting-edge tech, which has the potential to revolutionize how EVs are designed and perform.
New Patent Filing for In-Wheel Motors
The latest patent application from Toyota was published by the United States Patent and Trademark Office (USPTO) on July 18, 2024, after being initially filed on October 30, 2023. The patent specifically addresses a gear-case design for in-wheel motors. This design features two helical gears and thrust bearings, which Toyota claims can handle the thrust loads on the gears while adding minimal weight.
Reducing weight is crucial in automotive engineering, but it’s particularly important when dealing with in-wheel motors. One of the main challenges with in-wheel motors is managing unsprung mass—the mass not supported by the suspension, such as the motor attached directly to the wheel hubs. Excessive unsprung mass can make it difficult to achieve a smooth ride and optimal handling. Toyota’s new design aims to minimize this issue, making in-wheel motors a more viable option for future vehicles.
Toyota’s Continued Interest in In-Wheel Motors
While patent applications don’t always translate directly into production plans, Toyota’s ongoing interest in in-wheel motors is evident. The company has filed several patents related to this technology in recent years, suggesting that it remains a focus for their engineering teams. Toyota has a history of exploring in-wheel motor technology, as do other automakers like General Motors. This latest patent could indicate that Toyota’s in-wheel motor program is still active or has been revived.
In-Wheel Motors: A Longstanding Interest
Toyota’s interest in in-wheel motors isn’t new. The automaker highlighted the potential of this technology over 15 years ago, discussing its efficiency and packaging advantages. There were even indications that Toyota’s iQ EV might feature in-wheel motors, although the final production model used a standard inboard motor setup instead. More recently, Toyota has teased in-wheel motors as part of its Lunar Cruiser concept, a vehicle designed for use on the moon, showcasing the versatility and potential of this technology.
The Broader Landscape of In-Wheel Motor Development
In-wheel motors are gradually making their way into passenger vehicles, although they remain a relatively niche technology. One notable example is the Aptera, a highly efficient electric three-wheeler that incorporates in-wheel motors. However, there are still significant questions about the durability and safety of these motors, especially when subjected to the harsh conditions of daily driving.
Other automakers are also exploring different approaches to in-wheel motors. Hyundai, for instance, has teased a design that places the motor close to the wheel rather than directly inside it. This approach could offer some of the benefits of in-wheel motors while addressing concerns about unsprung mass and ride quality. However, Hyundai has yet to announce clear production plans for this technology.
