On April 28, 2026, information from the State Intellectual Property Office showed that Shandong Linglong Tire Co., Ltd. applied for a patent titled “A sample preparation method for keeping the tire shoulder groove intact for tire flexural fatigue testing.”
The application publication number is CN121917303A, the application number is CN202610088603.4, the application publication date is April 24, 2026, and the application date is January 22, 2026.
The patent summary shows that the invention belongs to the technical field of tire performance testing.
The specific steps are as follows: Step 1 is to obtain the groove structure size. Place the tire to be inspected on the laser scanner workbench, set the scanning parameters to identify the tire shoulder block and groove structure.
The actual size of the tire shoulder groove is accurately obtained through laser scanning and a three-dimensional image model is generated. Combined with the vertical directional cutting technology, the original groove geometry, which is the most critical and most susceptible to failure, is completely retained.
At the same time, the rubber material at the bottom of the groove has not undergone any secondary mechanical processing and maintains its original vulcanization state, cross-linking density and internal stress state, truly reflecting the material properties after tire manufacturing.
On this basis, fatigue cracks can initiate and propagate at the real location of stress concentration in the actual designed structure, and their shape and rate are more consistent with the failure mode in actual use.
Linglong Tire was established on June 6, 1994 and listed on the Shanghai Stock Exchange on July 6, 2016. Its registered address and office address both involve Shandong Province.
It is a leading tire manufacturer in China, focusing on the tire business, with advantages across the entire industry chain and outstanding investment value.
Linglong Tire’s main business is the design, development, manufacturing and sales of automobile tires. The Shenwan industry it belongs to is automobiles – auto parts – tires and wheels, involving concept sectors such as breaking stocks, sports industry, and tires.
In 2025, Linglong Tire’s operating revenue reached 24.642 billion yuan, ranking third among 12 peers, higher than the industry average of 11.62 billion yuan and the median of 4.337 billion yuan. There is a gap with the first-place Zhongce Rubber’s 44.956 billion yuan and the second-place Sailun Tire’s 36.792 billion yuan.
Among the main businesses, tire product revenue was 24.475 billion yuan, accounting for 99.32%.
In terms of net profit, it will be 1.369 billion yuan in 2025, ranking third in the industry, higher than the industry average of 922 million yuan and the median of 294 million yuan. The first place is Zhongce Rubber with 4.147 billion yuan, and the second place Sailun Tire is 3.617 billion yuan.
Shandong Linglong Tire Co., Ltd. has a rich patent situation recently.
For example, there are many invention patents such as “a visual warping roller detection device” and “a special bead component and design method for preventing bead burst”.
These patents cover multiple aspects of tire production, from tire design and manufacturing to performance testing, fully demonstrating Linglong Tire’s strength and efforts in technological innovation.
Linglong Tire’s continuous application for patents not only helps improve its technical level and product quality, but also gives it more advantages in market competition.
In the future, Linglong Tire is expected to rely on these patented technologies to further expand the market, increase its share in the global tire market, and promote China’s high-quality tire products to the world.
