Under certain loads, bearing in the numberor number of hours before pitting, known as bearing life. The life of rollingbearings in revolutions (or speed of work under a certain number of hours)definition: bearing within this life, in any of its bearing ring or a rollingbody occurred on the initial fatigue damage (peeling or defects). However,whether in the laboratory or in actual use, can be clearly seen, the appearanceof the same bearing under the same working conditions, the actual life is notthe same. In addition to several different definitions of bearings"life", one of the so-called "working life", it said theactual life of a bearing can be reached in before damage is composed of wear,damage is usually caused not by fatigue, but by abrasion, corrosion, damage andother reasons. In order to determine the seal bearing life standard, thebearing life and reliability Link. Because of differences in manufacturing precision,uniformity of material, even the same material, the same batch of bearings ofthe same size, under the same working conditions, the length of life is not thesame. If the statistical life of 1 units, is the longest life expectancy of 4units, the shortest 0.1-0.2 units, the longest and the shortest life is 20-40times of.90% bearing does not produce the number of revolutions of pitting, orhour experience called rated life bearing.
(2)Dynamic load rating:
For the bearing capacity comparison of bearinganti pitting, provisions of the rated life of a bearing one million , themaximum load can withstand the basic dynamic load rating, C said. It is bearingon the dynamic load rating of C under the action of the bearing one millionwithout the occurrence of pitting failure reliability for 90% C, the greaterthe carrying capacity is higher. The basic rated dynamic load bearing 1. refersto the pure radial load 2. thrust ball bearing is 3. pure axial load radialthrust bearing is to produce pure radial displacement and radial component.
Plain bearings, both inside and outside thering, there is no rolling body, usually made of wear-resistant materials, oftenused in low speed, light load and filling lubricating oil and maintenancedifficult mechanical rotating parts.
(2) Spherical plain bearing
The sliding contact surface of the jointbearing is spherical, which is mainly suitable for swinging motion, tiltingmovement and rotary motion.
(3) Antifriction bearing
Rolling bearing according to different loaddirection which can withstand or nominal contact angle for radial bearing andthrust bearing. The radial contact bearing for the nominal contact angle of 0radial bearings, angular contact radial bearing for the nominal contact anglegreater than 0 to 45. The radial bearing axial contact bearing for the nominalcontact angle for thrust bearing 90, angular contact thrust bearing for thenominal contact angle is greater than 45 but less than 90 of the thrustbearing.
(4) Deep groove ball bearing
Deep groove ball bearings are the mostrepresentative. Compared to other types of bearings with the same size, thiskind of bearing friction coefficient is small, extreme high speed, simplestructure, low manufacturing cost, high precision, without frequentmaintenance, and large size range, form, bearing is a kind of the most widelyused. It mainly bear radial load, also can withstand the axial load. When theonly bear radial load, the contact angle is zero.
(5) Self-aligning ball bearing
Self-aligning ball bearing is two groove ofthe inner ring and outer ring raceways between spherical and spherical ballbearing assembly. Outer ring raceway curvature center and bearing center line,so it has the same self-aligning ball bearing self-aligning function. In theaxial deflection shell, can be automatically adjusted that is not to increasethe burden bearing. The axial load of spherical roller bearings can bear radialload and two directions. Self-aligning ball bearing radial load capacity, suitablefor heavy load, load impact. Inner diameter is tapered bore bearings can beinstalled directly. Or use the sleeve, remove the tube installed in thecylinder axis cage. Stamping steel cage, polyamide forming. Self-aligning ballbearing is designed to withstand heavy load and impact load, precisioninstruments, low noise motor, automobile, motorcycle, metallurgy, rolling mill,mine, petroleum, paper, cement, sugar etc. Industry and general machinery, etc.
(6) Linear bearing
Linear bearing is divided into linearbearing and linear bearing metal plastic. Metal linear bearing is a kind oflinear motion system with low cost of production, for unlimited travel and withthe use of cylindrical shaft. Because the ball bearing in point contact withthe shaft, so the load is small. The ball rotation to low friction resistance,smooth movement so as to obtain high precision.