Hankook Tire & Technology has been granted a patent for a pneumatic tire with a reinforcing part that reduces noise and prevents pipe resonance. The tire features a groove and kerf in the tread, with one or more blocks and a reinforcing part inserted between them. The reinforcing part is bent multiple times and has a discontinuous change in cross-sectional area to inhibit the formation of a uniform air column and prevent pipe resonance. The reinforcing part consists of different-sized ribs connected in series. GlobalData’s report on Hankook Tire & Technology gives a 360-degree view of the company including its patenting strategy. Buy the report here.

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According to GlobalData’s company profile on Hankook Tire & Technology, anti-skid tyre treads was a key innovation area identified from patents. Hankook Tire & Technology's grant share as of September 2023 was 33%. Grant share is based on the ratio of number of grants to total number of patents.

Patent granted for a pneumatic tire with a reinforcing part

Source: United States Patent and Trademark Office (USPTO). Credit: Hankook Tire & Technology Co Ltd

A recently granted patent (Publication Number: US11752804B2) describes a pneumatic tire designed to be mounted on a tire wheel. The tire features a tread with a groove that is recessed towards the central axis of the tire and intersects with a kerf that is also recessed towards the central axis. The tire includes a reinforcing part that is inserted into the groove. The reinforcing part is bent multiple times and has a discontinuous change in cross-sectional area, which prevents the formation of a uniform air column in the tread during tire rotation and eliminates the occurrence of pipe resonance caused by the air column.

The reinforcing part consists of different ribs, including an SS rib, an M rib, an LL rib, an S rib, and an L rib. Each rib extends from both ends of a right-angled 'C' shape and is connected to each other in series. The ribs alternate in projection, with the SS rib, M rib, LL rib, S rib, and L rib projecting in opposite directions from a central reference axis.

The SS rib, for example, includes a first rib bent at a 90° angle, a second rib parallel to the central reference axis, and a third rib connected to the second rib. The first and third ribs have the same shape and extend outward in opposite directions. Similar arrangements are described for the M rib, LL rib, S rib, and L rib.

The patent also provides specific dimensions for the ribs. For example, the pitch length (Lp) between both ends of the SS rib is 25 mm, the width (W) perpendicular to the rib is 2 mm, and the ratio (H/Lp) of the length (H) of the second SS rib to the pitch length is 58%. Similar measurements are provided for the other ribs.

Overall, this patented pneumatic tire design aims to improve the performance and stability of the tire by preventing the formation of a uniform air column in the tread and eliminating pipe resonance. The specific arrangement and dimensions of the reinforcing ribs contribute to achieving these objectives.

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GlobalData, the leading provider of industry intelligence, provided the underlying data, research, and analysis used to produce this article.

GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.