On April 25, information from the State Intellectual Property Office showed that Zhongce Rubber Group Co., Ltd. and Hangzhou Haichao Rubber Co., Ltd. applied for a patent titled “A method and system for regulating natural frequency and excitation sources to improve tire cavity noise.”
The application publication number is CN121912633A, the application number is CN202610309501.0, the application publication date is April 24, 2026, and the application date is March 13, 2026.
The patent summary shows that the invention relates to the field of tire production technology. By collecting the weight and circumference of the tire embryo and predicting the peak frequency of the cavity noise, the extrusion fitting and molding parameters are adjusted by feed-forward and writeback to lock the natural frequency; the vulcanization secondary setting pressure is controlled at 0.05~0.07MPa and the peak overshoot is limited to no more than 0.02MPa to suppress RFV8H excitation caused by uneven internal stress; at the same time, no less than 12 clamping block transfer rings are used to weaken circumferential periodic disturbances.
After vulcanization, the target parameters are updated in a closed loop with the dual indicators of RFV8H and peak frequency, achieving a significant reduction in noise risks and customer complaint rates in the sensitive frequency band of 200-250Hz.
Zhongce Rubber was established on June 12, 1992 and will be listed on the Shanghai Stock Exchange on June 5, 2025. It is a leading company in the domestic tire industry. Its core business is tires and rubber products, and it has differentiated advantages across the entire industry chain.
In 2025, Zhongce Rubber’s operating income will reach 44.956 billion yuan, ranking first among the 9 companies in the industry, far exceeding the second place of 10.946 billion yuan. The industry average is 8.241 billion yuan and the median is 2.581 billion yuan.
Among the main businesses, tire revenue was 39.22 billion yuan, accounting for 87.24%.
In terms of net profit, it will be 4.147 billion yuan in 2025, also ranking first in the industry, much higher than the second place of 623 million yuan, the industry average is 664 million yuan, and the median is 236 million yuan.
Zhongce Rubber Group Co., Ltd. has a rich patent portfolio recently, covering multiple fields such as multi-objective optimization of electric vehicle tire bead durability and the establishment of electric vehicle tire bead sandwich rubber-fiber composite simulation models.
For example, in the technology related to electric vehicle tire bead, the performance and durability of tires are improved through continuous optimization methods and systems.
Hangzhou Haichao Rubber Co., Ltd. was established on December 29, 2014. It belongs to the rubber and plastic products industry, and the scale of the enterprise is large.
The company has invested in 0 foreign companies, participated in 10 bidding projects, and has 492 pieces of patent information.
Its recent patents are also quite diverse, including a real-time intelligent management method and system for energy in tire production plants based on a large language model.
There are technological innovations in all aspects of tire production, such as energy management and rubber composition preparation.
The tire noise reduction patents applied by Zhongce Rubber and Hangzhou Haichao Rubber are of great significance to improving the tire use experience and market competitiveness.
As consumers’ requirements for tire noise and other performance continue to increase, the application of this patented technology is expected to enable companies to occupy a more favorable position in the market and promote technological progress in the entire tire industry.
