Air Compressor Case Study
Invalid Case
20190725 Application Case: A customer in the air compressor industry, using an oil-free 550W vane compressor, reported that after less than two months of operation, unusual noises began to occur. The unit was equipped with two sets of 6203-2RS bearings.
According to the inspection by our company’s technical personnel, all dimensional measurements are within specifications; however, the clearance has been adjusted from C3 to C0, and the noise level exceeds the permissible limit. The detailed analysis is as follows:
1: The customer brought back the bearing from the site, as shown in the photo: there are no obvious signs of installation or wear on the exterior; when rotating the bearing, there is noticeable binding and axial play, leading to the preliminary conclusion that the raceway is damaged.
2: After prying open the bearing cover, the internal grease was in good condition, with no discoloration and no loss of lubricating performance.
3: Under the micrograph of bearing #1, pitting is observed across the raceway surface, indicating micro‑current corrosion; localized burn marks are present on the raceway, arranged in a zigzag pattern.
4: In the micrograph of bearing #2, large pits are visible on the raceway surface, also attributable to electrical erosion; however, the current passing through the contact interface is relatively higher than that in bearing #1.
Draw a conclusion
Due to equipment leakage (the air compressor lacks a leakage protector), current passes through the bearing, creating a potential difference between the outer and inner rings. This causes the lubricant film to break down, resulting in bearing damage and abnormal noise.
Creating value for society through fast, professional, and high-quality service.
Chichuang·Hangzhou
Address: Floor 4, Unit 2, Building 10, No. 505 Xingguo Road, Linping District, Hangzhou City
Chichuang·Shenzhen
Address: Room 2405, Building 111, Phase I, Vanke City, Nanbu Bay, Humen Town, Dongguan City
Chichuang·Chongqing
Address: Building 4, No. 5 Huoju Avenue, Jiulongpo District, Chongqing City
Copyright © 2026 Hangzhou Chichuang Shaft Research Technology Co., Ltd.
Factory Address: Building 1, No. 10, Nangonghe Road, Donghu Subdistrict, Linping District, Hangzhou.
Powered by: