Successfully developed cylindrical bearingss for planetary gears for EV vehicles

Successfully developed cylindrical bearingss for planetary gears for EV vehicles

In recent years, with the advancement of policies to limit carbon dioxide emissions, new energy vehicles have gradually become popular. Among them, in order to reduce the power cost, the weight reduction of the reduction gear has become an important issue. In order to meet the market’s demand for lightweight, a foreign bearing research and development organization replaced the iron cage commonly used in cylindrical bearingss for planetary gears with a resin cage of the same size but 20% lighter, and developed a "new energy vehicle-oriented" Lightweight cylindrical bearings for planetary gears"

Multiple gears are like planets, arranged around the sun gear at the center point to form planetary gears, and the gears mesh with each other to perform necessary shifts. Since the centrifugal force generated by the revolution of the planetary gear is applied to the cage of the cylindrical bearings of the planetary gear, a high-durability iron steel cage is usually used. But in order to further reduce the weight of the car, they developed a resin cage that can reduce the stress generated in the cage compared with the iron cage. Compared with the cylindrical bearings made of the iron cage of the same size, the weight is reduced by about 20%.

The cylindrical bearings technical features

1. Shorten the running time of grease

NSK successfully developed the rolling element guide cage, which has the same durability as existing products. By improving the shape of the cage and improving the discharge performance of excess grease, compared with the general outer ring guide cage, the running-in time of grease lubrication can be shortened by about 70% at the maximum.

2. Reduce abnormal temperature rise during oil-air lubrication

Under the condition of oil-air lubrication, the traditional outer ring guidance method is difficult to solve the excessive temperature rise caused by too much lubricating oil inside the bearing at low speed. The rolling element guide method can solve the above problems and realize the stable operation of the main shaft during oil-air lubrication.

3. Improve the reliability of the rolling element guide cage

Aiming at the problem of easy damage to cages guided by rolling elements, NSK optimized the material and shape of the cage to improve the durability (reliability) of the cage guided by the rolling elements.

New cylindrical bearings development effect

This technology can shorten the assembly time of grease-lubricated spindles and improve the production efficiency of machine tool manufacturers. At the same time, the abnormal temperature rise during oil-air lubrication is reduced, the strength of the roller guide cage is improved, and high reliability is achieved.

New cylindrical bearings use

In machining centers for forming automotive parts and general mechanical parts, the electric spindle with a built-in motor generates axial elongation due to self-heating. Therefore, cylindrical roller bearings are generally used at the back end of the spindle. The new technology developed by NSK this time is most suitable for the back-end support bearing of the spindle.

The impact of new bearings on cylindrical bearings in the automotive industry

The cylindrical bearings is mainly used to complement the host industry, including automobiles, home appliances, medical equipment and other industries. The development of related industries will drive the demand of the industry. China auto market has maintained a trend of rapid growth in recent years. Considering factors such as car ownership, per capita income, and per capita car ownership, cars are still in the incremental market and have not been transferred to the stock market. According to the "2015-2020 China Bearing Manufacturing Industry Production and Sales Demand Forecast and Transformation and Upgrade Analysis Report" released by the Foresight Industry Research Institute, the high growth rate of the automotive industry will continue for a period of time, and the future growth rate will not be less than 15%.

With the process of miniaturization and electrification of automobiles, the corresponding component products are constantly increasing. Therefore, the automotive-related parts market will continue to expand in the future. The development of automotive bearings will focus on safety, improving efficiency and reducing harmful substances. Automobile radiator cooling fan motor, wiper motor, exhaust gas recirculation system (EGR) valve frame and anti-lock brake system (ABS) represented by oil pump motors and their application systems are the main application areas of miniature bearings.

In particular, the cylindrical bearings for ABS was only used for high-end cars in the 1980s. After that, it was used as an important product for safety measures in the direction of miniaturization and popularization, and its use has been continuously expanded since the mid-1990s. The automobile spindle developed at present is developing towards multi-function and safety. It not only uses the cylindrical bearings to control the brake intermittently, but also links with the sensor that monitors the driving situation, and transmits different braking forces to the front, rear, left, and right wheels. Control safe driving as a whole. The future development trend of miniature bearings. This system is an ABS upgrade system. Different manufacturers have different cylindrical bearings such as ESC, EPS, VSC and so on.

The development of ABS system is a typical example of the development of automobile-related products. In the future, cylindrical bearings will derive many new application products with increasing requirements for safety and environmental protection. The imported bearing market aims at hybrid vehicles and electric vehicles to try to create new types of car-related products. In this development, the field of miniature bearings will continue to expand, and its precision will continue to improve. With the continuous development of China\'s automobile industry, there is huge room for domestic enterprises to develop. If you are looking for cylindrical bearings or get more information about cylindrical bearings, please send an email to

The impact of new bearings on cylindrical bearings in the home appliance industry

The market scale of China household appliance industry has been expanding year by year, and the growth rate has declined in the past two years. The Institute of Foresight Industry predicts that the market scale of China household appliance industry will continue to expand year by year.

The cylindrical bearings for home appliances represent motor bearings for vacuum cleaners and air conditioners, mainly motors with an outer diameter of 22mm. The characteristic of the vacuum cleaner is that the rotation speed of the motor is as high as 40,000 rpm/min, and the motor of 100,000 rpm/min has also been used in vacuum cleaners sold in large quantities in the market. Air conditioners are equipment used indoors for a long time and have high requirements for low noise. The current problem is that the electrical corrosion caused by the electrical connection between the inner and outer rings of the cylindrical bearings can only be solved by using non-conductive ceramic balls, which will improve the technical level of the cylindrical bearings for household appliances.

The impact of new bearings on cylindrical bearings in the medical industry

In recent years, the market scale of China medical device industry has maintained rapid growth. The Prospective Industry Research Institute predicts that China medical device industry will maintain a growth rate of more than 20%.

In medical equipment, the use of cylindrical bearings also involves many aspects, mainly used for blood pumps for artificial dialysis, drug injection pumps, and air pumps for ventilators. These devices are used on the pillow side of the hospital bed, so they must be treated with low noise.

An extreme example is the dental drill used by the dentist. The drill bit is 400,000 to 500,000 revolutions per minute, which is difficult for the doctor to bear under the stimulation of the high pitch. A major issue in the name of medical device products is the corrosion resistance of the cylindrical bearings to chemicals and acids. This is an issue that cannot be separated from bearing materials.

From the future development trend of bearings in the above application fields, the cylindrical bearings are mainly developed in the direction of precision and bass, so the future development direction is the name of precision products. In view of the wide application of precision cylindrical bearings, the development of various industries has increasingly higher requirements on the accuracy, performance, life and reliability of cylindrical bearings, and the number of requirements is also increasing. In recent years, China domestic machine tool industry and automobile industry have developed rapidly. In order to meet the needs of product upgrading and replace imports, China precision cylindrical bearings products have a broad market prospect.

Wuxi Spark Bearing Co., Ltd is a modern high-tech professional high-quality roller bearing manufacturer integrating R&D, manufacturing, sales, and service. Our bearings are mainly supplied to OEM customers in many industries, such as mining, petroleum, chemical, coal, cement, heavy machinery, wind power, construction machinery, and other industries. We have a complete supply chain and can provide customers with almost a full range of standard and non-standard customized bearings. Welcome to send an email or click on the product to send an inquiry for the latest price of related bearings. Looking for the cylindrical bearings or get more information about any other bearings, please send an email to Or visit the following website: https:/


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