Wheel bearings used on flatbed trucks, as long as they are qualified bearings produced by regular companies, generally choose 6305ZZ. Inner hole diameter: 25MM, outer diameter: 62MM, thickness: 17MM, bearing capacity of a single bearing : 11KN, the four bearings can load: more than 5 tons, and can withstand impact forces such as uneven roads. The conventional calculation of the load is that the total load of the two wheels can reach 70%.

Santai Bearing provides such deep groove ball bearings.

Extended information

Currently, my country's bearing industry is facing three major prominent problems: low industry production concentration, low R&D and innovation capabilities, and low manufacturing technology levels.

First, the industry’s production concentration is low. Of the approximately US$30 billion in bearing sales worldwide, the world's eight largest multinational companies account for 75-80%. The two largest companies in Germany accounted for 90% of the country's total, the five companies in Japan accounted for 90% of the country's total, and the United States accounted for 56% of the country's total. However, the sales of the 10 largest bearing companies such as my country Wa Bearing only account for 24.7% of the entire industry, and the production concentration ratio of the top 30 companies is only 37.4%. Second, R&D and innovation capabilities are low. The industry-wide basic theoretical research is weak, participation in the formulation of international standards is weak, there are few original technologies, and there are few patented products.

Our current design and manufacturing technology is basically imitation, and our product development capabilities are low. This is reflected in the following: Although the matching rate for domestic main engines reaches 80%, high-speed railway passenger cars, mid-to-high-end cars, computers, and air conditioners , high-level rolling mills and other important main engine supporting and maintenance bearings, basically rely on imports.

Third, the level of manufacturing technology is low. my country's bearing industry manufacturing technology and process equipment technology have developed slowly, the CNC rate of turning and processing is low, and the level of grinding and processing automation is low. There are only more than 200 automatic production lines in the country. Advanced heat treatment processes and equipment that are crucial to bearing life and reliability, such as controlled atmosphere protective heating, double refinement, bainite quenching, etc., have low coverage, and many technical problems have failed to achieve breakthroughs.

The research and development of new steel types for bearing steel, the improvement of steel quality, and the research and development of related technologies such as lubrication, cooling, cleaning and abrasives cannot yet meet the requirements for improving the level and quality of bearing products. As a result, the process capability index is low, the consistency is poor, the product processing size dispersion is large, and the inherent quality of the product is unstable, which affects the accuracy, performance, life and reliability of the bearing.

The early form of linear motion bearings was to place a row of wooden poles under a row of crowbars. Modern linear motion bearings use the same operating principle, except that balls are sometimes used instead of rollers.

The simplest rotating bearing is the sleeve bearing, which is just a bushing sandwiched between the wheel and axle. This design was later replaced by rolling bearings, which replaced the original bushings with many cylindrical rollers, each rolling element acting like a separate wheel.

Reference: Baidu Encyclopedia-Bearing