Eatures of New Energy Semi-steel Tires
Low rolling resistance is one of the most crucial characteristics of new energy semi-steel tires and a key difference between them and traditional semi-steel tires. New energy vehicles rely on battery power, and driving range remains a core concern for users. A 10% reduction in tire rolling resistance can increase vehicle range by 3%-5%. To achieve low rolling resistance, new energy semi-steel tires have undergone dual innovations in rubber compound and tire structure.
Regarding rubber materials, a composite system of highly dispersed silica and solution-polymerized styrene-butadiene rubber is used. This combination reduces internal friction between rubber molecules, lowering energy loss during tire rolling and resulting in a rolling resistance coefficient generally below 6.5 kg/t, with some high-end products even reaching as low as 5.8 kg/t, far below the average level of over 8 kg/t for traditional semi-steel tires.
In terms of tire structure design, by optimizing tread curvature and contact area, a narrow tread and low aspect ratio design is adopted to reduce the friction contact area between the tire and the ground. Simultaneously, lightweight sidewall materials are used to further reduce rolling resistance. For example, Michelin e-Primacy semi-steel tires for new energy vehicles, with their low rolling resistance design, can help new energy vehicles gain an additional 50-80 kilometers of range, effectively alleviating users' "range anxiety."
High Load-Bearing Capacity: Meeting the Heavy-Duty Needs of New Energy Vehicles
New energy vehicles, due to their large-capacity battery packs, generally have a 15%-30% heavier weight than traditional gasoline vehicles. For example, the battery weight of a typical compact new energy sedan can reach 300-500 kg, placing higher demands on the load-bearing capacity of the tires.
New energy semi-steel tires, through strengthened tire structure and optimized material strength, possess excellent high load-bearing characteristics. In terms of tire carcass materials, a composite structure of high-strength polyester cord and aramid fiber is used. Polyester cord has excellent fatigue resistance and tensile strength, while aramid fiber has ultra-high strength and low shrinkage. The combination of these two increases the tire's load-bearing limit by more than 20%.
Meanwhile, the bead area features a multi-strand steel wire winding design, enhancing the stability of the bead's fit to the rim and preventing bead slippage under heavy loads. In practical applications, the semi-steel tires adapted for new energy SUVs can withstand a single load of over 1000kg, easily handling the dual challenges of fully loaded vehicles and complex road conditions.
Noise Reduction and Vibration Absorption: Enhancing the Driving Experience of New Energy Vehicles
New energy vehicles eliminate engine noise, making tire noise the primary source of noise during vehicle operation. Therefore, noise reduction performance is a crucial characteristic of new energy semi-steel tires. To reduce tire noise, new energy semi-steel tires are optimized in both tread pattern and carcass structure.
In terms of tread pattern design, an asymmetrical variable pitch pattern is used. By adjusting the size and spacing of the tread blocks, the resonance frequency of noise is broken, reducing noise generated by air turbulence. Simultaneously, lateral slits are incorporated into the tread grooves to further absorb noise energy, reducing tire noise by 3-5 decibels, meeting the EU Labelling Standard A.
In terms of tire structure, a multi-layered cushioning rubber design is adopted, adding a highly elastic cushioning layer between the tread and the tire carcass to effectively absorb vibrations caused by road bumps. Simultaneously, the hardness of the sidewall rubber is optimized to improve the tire's shock absorption performance. For example, the Goodyear Eagle EfficientGrip Performance new energy semi-steel tire, through its quiet and shock-absorbing design, keeps the vehicle's interior noise below 60 decibels at a speed of 60 km/h, providing users with a quiet and comfortable driving environment.
Wear resistance and anti-aging properties: Extending service life and reducing costs.
The torque output characteristics of new energy vehicles differ from those of traditional fuel vehicles. The torque bursts instantaneously at start-up, easily leading to accelerated localized wear on the tire tread. At the same time, the heat generated by the battery pack raises the operating temperature of the tire, accelerating rubber aging.
To address these issues, new energy semi-steel tires possess excellent wear resistance and anti-aging properties. The tread rubber compound incorporates high-abrasion-resistant carbon black and antioxidants. The high-abrasion-resistant carbon black enhances the rubber's hardness and wear resistance, increasing the tire's treadwear index to over 400, which is 1.2-1.5 times that of traditional semi-steel tires, extending its service life by over 30%. The antioxidants inhibit oxidation reactions in the rubber at high temperatures, delaying aging and cracking, and ensuring stable performance within an extreme temperature range of -30℃ to 80℃.
Furthermore, the tread pattern features a design of alternating wide main grooves and lateral grooves, enhancing water drainage and heat dissipation. This prevents softening and wear caused by localized overheating, further improving tire durability. In daily use, the average replacement cycle for new energy semi-steel tires can reach 60,000-80,000 kilometers, significantly longer than the 40,000-50,000 kilometers replacement cycle of traditional semi-steel tires, substantially reducing user operating costs.
