Small and medium motor bearing assembly and lubrication
Small and medium-sized motors generally adopt bearing end-cover structure, and the assembly structure, installation accuracy and lubrication system directly affect system reliability and operating efficiency. In order to compensate for the inconsistent axial extension length of the moving and stationary components due to temperature changes, the drive end and the non-drive end are always fixed at one end and float at the other end. The following small series mainly discusses bearing selection, positioning, lubrication and bearing structure system, etc., in order to provide a complete and easy-to-maintain bearing system for the motor.
Common grease type
(1) Calcium-sodium based grease. The thickening agent is a mixture of calcium soap and sodium soap, the dropping point is 120~130 ° C, the penetration degree is 200-290 mm, the water resistance is weaker than the calcium base grease, and the working temperature is allowed to work in the water vapor or humid environment. 80~100 °C, not suitable for too low temperature.
(2) Composite calcium-based grease. It consists of calcium soap, compounding agent and lubricating oil. It has a dropping point of 180~220°C and a penetration degree of 210~350mm. It has moisture resistance and high temperature resistance and can be used at 150~200°C.
(3) Molybdenum disulfide composite calcium-based grease. It is made of complex calcium base grease and molybdenum disulfide. It can withstand high temperature and moisture, and has strong pressure resistance. It is suitable for high temperature load.
(4) Lithium based grease. Using lithium soap as a thickening agent, the dropping point is 165~190°C, and the penetration degree is 202~380 mm; it is characterized by cold resistance, heat resistance, water resistance and chemical stability. It can be used in environments with a wide range of low temperature and temperature variations.