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High temperature resistance analysis of ordinary motor bearing

Release time: October 12, 2020 15:18:35 Views: 38

According to the national standard, the rolling bearing of small and medium-sized motor commonly used by us is bearing steel bearing, and its working temperature shall not be higher than 95 ℃. Why is that? What is the actual maximum temperature that bearing steel bearing can bear? These are mainly limited by the bearing material, bearing steel, cage, sealing material, the heat-resistant temperature of lubricants and other conditions. The following microenterprises will analyze the factors affecting the bearing high temperature performance one by one.


1. Dimensional stability temperature of bearing steel during heat treatment
For ordinary bearing steel, there is a stable temperature of heat treatment. Under this temperature, the dimension of bearing steel is stable, and the hardness of bearing steel meets the requirements of use. The stable temperature of general bearing heat treatment is 150 ℃. Specific manufacturers of bearing heat treatment stability temperature will be different.
2. Bearing cage temperature range

Generally, steel or brass cages can withstand a wide temperature range. The heat-resistant temperature of steel cages can reach 300 ℃ and that of brass cages can reach 250 ℃. However, for nylon cages, the temperature ranges from - 40 ℃ to + 120 ℃.


3. Temperature range of seals
For closed bearings, metal dust cover, there is no need to consider the temperature range. For rubber seals, it needs to be considered. The operating temperature range of NBR is - 40 ~ + 120 ℃, which can work stably within 100 ℃ and 120 ℃ for short time; for fluororubber (FKM), it can work stably at - 30 ~ + 200 ℃ and work at 230 ℃ for a short time.

4. Allowable temperature of bearing grease


Temperature is one of the most important factors affecting lubrication life. With the increase of temperature, the viscosity of grease base oil decreases. The life of the grease is calculated based on a temperature increase of 15 ℃ per 50 ℃. The allowable working temperature of the motor bearing should be the intersection of the allowable temperature range of all parts of the bearing (the narrowest range). Only in this range can the safety of the bearing be ensured.
Therefore, whether the bearing can operate in high temperature environment mainly depends on the selection of lubricant, followed by bearing sealing material (only for closed bearing) and cage, and finally bearing steel. In practical application, the temperature measured generally is the temperature near the outer ring of the bearing. The maximum difference can be 15 ℃ for different measuring methods and positions. Generally, the heat dissipation condition of bearing seat is better than that of shaft, so the temperature of inner ring and rolling element is 5 ~ 10 ℃ higher than that of outer ring. Therefore, when the test position is outside the outer ring of the bearing, if the measured temperature is 95 ℃, the hottest spot temperature of the inner ring may reach 120 ℃. This temperature has reached the stable heat resistance temperature of nylon cage, bearing steel and grease, so it is necessary to select bearing materials with better heat resistance, such as stainless steel bearings or ceramic bearings.

Well, this issue of small and micro bearings will be shared here for you, hoping to help you in the safe selection of bearings. If you want to know more about bearings, Please call Yuwei's sales hotline 021-51099639-802 and 24-hour after-sales service hotline 15309279285 (wechat's same number), we will provide you with help and technical service support at any time!

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Shanghai Yuwei Bearing Co., Ltd. (Headquarters)
Tel: 021-51099639
Fax: 021-51861291
Email address: yw@gifudayo.com
Address: 2758 Songjin Road, Zhangyan Town, Jinshan District, Shanghai, China
Shaanxi Yuwei Bearing Manufacturing Co., Ltd
Tel: 029-86696506
Fax: 029-89503160
Email address: sales@gifudayo.com
Address: Qinhan new town free trade zone, Xixian new area, Shaanxi Province
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