With the large-scale promotion of new energy vehicles, the bearing industry is facing a test of perf

In 2017, the cumulative global sales of new energy passenger vehicles exceeded 1.22 million, an increase of 58% year-on-year. Among them, the sales of new energy passenger vehicles in China exceeded 578,000, accounting for 47.37%. With the country's in-depth promotion of energy conservation, emission reduction and environmental protection, the popularity of new energy vehicles has become an irreversible market trend.

With the large-scale promotion of new energy vehicles, the bearing industry is facing a test of performance improvement

Because of this, more and more multinational automobile companies have formulated corresponding development strategies in the Chinese market. Not long ago, Ford Motor Company announced that it plans to move 70% of its electric vehicle production lines to China by 2025. Tesla, which will build a plant in China, also has high hopes for the Chinese market. The company has suggested that in a few years, Tesla's sales in China will account for a larger share of its global sales.

With the sharp increase in sales of new energy vehicles, the demand for drive motors has risen rapidly. It is predicted that the global drive motor market size will reach $ 4.4 billion in 2020.

New energy vehicle drive motors require special bearings. Compared with traditional cars, new energy vehicles require motors to have very high limiting speeds, while meeting the low-temperature requirements of -40 ° C and high-temperature requirements above 150 ° C, and the bearings must have maintenance functions to adapt to the axial impact caused by frequent start-stops.

The new energy vehicle special bearing market is booming, and it poses a severe challenge to China's bearing industry. Yu Zhizheng, a senior engineer at the Beijing Automotive Group Co., Ltd., and Chen Guangzu, the secretary general of the China Automotive Industry Advisory Committee, agree that China's bearing industry should meet this challenge, actively develop and produce special-purpose bearings for new energy vehicles, and take the initiative in market competition.

They optimized the internal structure of the bearing, and used simulation and lubrication technology to solve the bearing heating and lubrication problems at high speeds and temperatures, forming a new energy vehicle drive motor bearing design theory and method to ensure that special bearings have high precision, low centrifugal force, and low friction. It can meet the comprehensive performance requirements of new energy vehicles such as low starting torque, high speed and rapid transmission, durability and high reliability. In addition, the technology center has developed test benches for high-speed and high-temperature performance, starting torque performance, durability performance, and grease performance for new energy automobile bearings, overcomes the test bench loading procedures, high speed, and temperature rise, and formulates new energy automobile bearings. The high-speed, high-low temperature, durability, grease performance and other test specifications have formed a series of new energy vehicle bearing test standards.

In fact, high-speed drive motors for new energy vehicles have high requirements for bearing production accuracy. SKF Sweden is the guideline of the world bearing technology industry and manufacturing industry. Yu Zhizheng said: "The driving speed of the new energy vehicle driving motor is fast, and it has high requirements on bearing accuracy and quiet performance. The domestic new energy vehicle driving motor has less precision, reliability and durability than the Swedish SKF products." Chen Guangzu It is believed that the domestic bearing industry has not done enough research on the performance of bearings, especially for new energy vehicles; compared with developed countries, there is a large gap in the material of high-end bearings in China.