Santai Bearing provides this kind of deep groove ball bearing.
Extended data
At present, China's bearing industry mainly faces three outstanding problems: low production concentration, low R&D and innovation ability, and low manufacturing technology level.
First, the concentration of industrial production is low. In the global bearing sales of about $30 billion, the world's eight multinational companies account for 75% ~ 80%. Germany's two major companies account for 90% of its national total, Japan's five major companies account for 90% of its national total, and the United States 1 company accounts for 56% of its national total. However, the sales of the largest 10 bearing enterprises in China only account for 24.7% of the whole industry, and the production concentration of the top 30 enterprises is only 37.4%.
Second, the ability of R&D and innovation is low. The basic theoretical research of the whole industry is weak, and the ability to participate in the formulation of international standards is weak, with few original technologies and few patented products.
At present, our design and manufacturing technology is basically imitation, and our product development ability is low. Although the matching rate of domestic main engines reaches 80%, the matching and maintenance bearings of important main engines such as high-speed railway passenger cars, middle and high-grade cars, computers, air conditioners and advanced rolling mills are basically imported.
Third, the manufacturing technology level is low. The development of manufacturing technology and equipment technology in bearing industry in China is slow, the turning numerical control rate is low and the grinding automation level is low. There are only over 200 automatic production lines in China. Advanced heat treatment technologies and equipment, such as controlled atmosphere protection heating, double refining and bainite quenching, which are crucial for bearing life and reliability, have low coverage, and many technical problems have not been broken.
The research and development of new bearing steel, the improvement of steel quality and the research and development of lubrication, cooling, cleaning, abrasive tools and other related technologies can not meet the requirements of improving the level and quality of bearing products. Therefore, the process capability index is low, the consistency is poor, the product processing size is large, and the internal quality of the product is unstable, which affects the accuracy, performance, life and reliability of the bearing.
The early form of linear motion bearing is to put a row of wooden sticks under a row of pry plates. Modern linear motion bearings use the same working principle, but sometimes balls are used instead of rollers.
The simplest rotary bearing is a sleeve bearing, which is just a bushing sandwiched between the wheel and the axle. This design was later replaced by rolling bearings, that is, many cylindrical rollers were used instead of the original bushings, and each roller was like an independent wheel.
References:
Baidu encyclopedia-bearings