General Motors has traditionally placed a high priority on the ride comfort of its vehicles, and its latest patent filing with the European Patent Office aims to improve it even further. The innovation involves adding activated carbon inside the tire assembly to increase the effective air volume, which reduces tire stiffness and results in a smoother ride.
Maximizing Air Volume for a Smoother Ride
Tire pressure plays a crucial role in ride comfort—the smaller the air volume, the higher the pressure required, resulting in a stiffer ride. For example, a racing bicycle tire can reach 145 psi, while a tractor tire runs as low as 20 psi. GM’s approach aims to increase the effective air volume inside a tire without changing its size. By doing so, tire stiffness is reduced, allowing for better shock absorption and a more comfortable driving experience.
How Activated Carbon Can Improve Tire Performance
Activated carbon’s high surface area and absorption properties make it an ideal material for improving ride quality. GM’s patent proposes placing activated carbon inside the wheel/tire assembly, where it interacts with air molecules to effectively increase tire volume and reduce stiffness. This not only ensures a softer ride but also helps absorb noise, leading to quieter road contact and lower in-car noise levels.
The patent outlines several possible placements for the activated carbon, including:
- Strips attached to the inside of the tire’s tread surface
- Patches applied along the rim’s inner circumference
- A continuous strip running around the inner rim
- A dedicated chamber along the rim’s edge
- Special containers mounted inside the tire or rim
While the full impact of this technology remains to be seen, its potential to enhance both comfort and noise reduction makes it an exciting innovation—if the cost proves justifiable.
