The inner ring and outer ring of tapered roller bearing have tapered raceway, and between tapered raceway mounted tapered roller. If stretching the tapered surface, they will focus on a point on the bearing axis. Tapered roller bearing is mainly used for carrying radial and axial combined load which is mainly radial load. The axial load carrying capacity of bearing is determined by contact angle a, the bigger axis, the bigger axial load carrying capacity is. Tapered roller bearing is a separable bearing; inner assembly is consisted of inner ring with roller and cage, which can be mounted with outer assembly separably.
Allowable angle error Tapered roller bearing generally is inadmissibility inclination between axis and case shell hole. If there is, it can`t be bigger than 2`.
Clearance
Clearance of single row tapered roller bearing only appear after mounting which can only be determined after adjusted by another right-about localization bearing. The clearance of double-row and four-row tapered roller bearing can be provided with relevant standard according to the requirements of the customers.
EBC manufacture metric system and British system single row, double row and four row tapered roller bearing units structure.
Single row tapered roller bearing
The bearing can only limit one direction axial displacement of axis or case shell and carry one direction axial load. With the radial load action, the axial force produced inside bearing should be balanced. Two bearings should be face-to-face mounted or back-to-back mounted.
Double row tapered roller bearing
The tapered bearing can carry radial load as well as bi-directional axial load, and can limit bidirectional axial displacement of axis or case shell within the axial clearance of bearing.
Four row tapered roller bearing
The bearing`s feature is mostly the same as double row tapered roller bearing, but can and carry more radial load than double row tapered roller bearing and lower limit rotation rate. This type is mainly used in heavy machinery, such as roll mill.
Cage
Tapered roller bearings generally uses pressed steel plate basket cage, also can use turned solid cage if its dimension is bigger.
Equivalent dynamic load
P=Fr [N]Fa/Fr≤e
P=0.4Fr+YFa [N]Fa/Fr>e
As to paired mounting single row tapered roller bearing (basic dimension could be different), when calculate the equivalent dynamic load of bearing, the additive axial force caused by radial load must be also calculated. The additive axial forces of single row tapered roller bearing can be approximately calculated by the following formula.
Double row and four row tapered roller bearing
P=Fr+Y1Fa [N] Fa/Fr≤e
P=0.67Fr+Y2Fa [N] Fa/Fr>e
Equivalent static load
Single row tapered roller beating
Po=0.5Fr+YoFa [N]
若Po<Fr则取Po=Fr
Double row and four row tapered roller bearing
Po=Fr+YoFa [N]
Both Fr and Fa are total load acting on single row, double row and four row tapered roller bearing.
Calculation factors such as e, Y, Y1, Y2, Yo are listed in bearing dimension table.
This type of bearing has British system series product.
Main Application
Auto fore wheel, rear wheel, transmission gear, differential gear, pinion shaft, main spindle of machine tool, construction equipment, large scale agricultural machinery, speed reducer gear of railway vehicles, roll neck mini speed reducer gear of roll mill, etc.
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