Rolling bearing instructions

1. The characteristics of the rolling bearings: ( 1) Small and stable friction coefficient, starting easier. In general, the ball bearing f = 0. 001 - 0. 002, roller bearing f = 0. 001 - 0. 003, needle f = 0. F = 0 002, thrust ball bearing. 003, thrust roller bearings f = 0. 004. ( 2) The axial size is small. ( 3) Radial clearance is small, can be preloaded. ( 4) Lubrication is convenient, easy to maintain. ( 5) Some bearing can withstand circumferential and radial force at the same time, the structure is simple. ( 6) Faults: a poor ability to withstand shock, radial size, high speed from time to tome noise, short service life. 2. Rolling bearing structure and material: is made up of inner and outer ring, rolling element and cage components consisting of standard parts. Ring and roller materials mainly is high strength, high hardness of chromium manganese high carbon steel, such as GCr15, GCr15SiMn, etc. Ball also useful ceramic ball, used in high speed bearing. Cage with a soft steel plate stamping, with copper, aluminum, zinc alloy or plastic, etc. 3. Rolling bearing failure modes: the contact stress is mainly caused by fatigue pitting. The life of the bearing is calculated according to the fatigue pitting failure. To open or untight seal bearing, often appear the wear failure. Under the condition of impact load or low speed, bearing plastic deformation failure may occur. 4. The classification and selection of rolling bearing, mainly of nine categories above. Among them, the angular contact bearing and deep groove ball bearings can withstand radial force and axial force at the same time, application is more common. Self-aligning bearing can withstand the small amounts of circumferential force. Circular roller and needle roller bearing is not bear axial force, thrust bearing is not bear radial force. Generally, roller bearing capacity is bigger, is applied to and places that have requirements of the impact of low speed and heavy loading; Ball bearing allowable speed is higher, used in high speed light load; When installing or shaft deformation is great error in the self-aligning bearing should be used. 5. The precision of the rolling bearing, the precision of the rolling bearing can be divided into: 5 B, C, D, E, G. G for general grade, the most widely used. B the highest precision, the price also the most expensive. 6. Rolling bearing's code: code in English letters and Numbers. Such as bearing D23024C said: D - D precision ( The former letters, G can be omitted) , 24 - Inside diameter d = 24 * 5 = 120 mm, 0 - Diameter and width of the series, 23 - Bearing type ( Angular contact ball bearing) 。