Tapered Roller Bearing

1. Main structure types

1. Single row tapered roller bearing type 30000
This type of bearing can limit the axial displacement of the shaft and housing in one direction and bear the axial load in one direction. Additional axial force will be generated under the action of radial load, therefore, it is generally used in pairs in the two bearings of the shaft. 31300 series tapered roller bearings have a large contact angle (27°~30°) and can withstand large axial loads. The contact angle of other series bearings is between 10°~18°.

2. Double row tapered roller bearing type 350000
This type of bearing has a pair of raceway outer rings and two inner rings. There is a middle spacer between the two inner rings. Changing the thickness of the spacer can adjust the clearance of the bearing. This type of bearing can withstand two-way bearings while bearing radial loads. Axial load, which can limit the bidirectional axial displacement of the shaft or housing within the range of axial clearance of the bearing. Double row tapered roller bearings with double half outer ring structure can also be produced, as shown in the figure.

2. Allowable inclination angle 

If the contact state between the roller and the ring is appropriate, not only can the abnormal edge load of the contact surface be prevented, but also the inclination of the inner and outer rings caused by installation errors and the like can be allowed. For tapered roller bearings, the allowable inclination angle is generally 0.0005rad (1.5') for single row and back-to-back combinations, and 0.001rad (3.5') for face-to-face combinations. If you need a larger inclination angle, please contact the technical center of Renben Group.

3. Tolerance and clearance

Tapered roller bearings can be manufactured in various tolerance classes as required.
The clearance of single row tapered roller bearings can be adjusted by the user during installation according to different requirements. The radial clearance of double row tapered roller bearings can be adjusted according to the aforementioned tolerances and clearances according to user requirements. During use, when users need to change the clearance, they can be adjusted according to relevant regulations.

4. Radial Equivalent Dynamic Load

Single row tapered roller bearings:
Pᵣ=Fᵣ (when Fₐ/Fᵣ≤e)
Pᵣ=0.4Fᵣ+YFₐ (when Fₐ/Fᵣ>e)
When single row tapered roller bearings are used in pairs (the basic size can be different), when calculating the equivalent dynamic load of the bearing, the additional axial force caused by the radial load must be taken into account. The axial load of the bearing is related to its installation configuration and the direction of the applied axial load.
The additional axial force S of a single row tapered roller bearing can be approximately calculated by the following formula: S=Fᵣ/2Y

Double row tapered roller bearings:
Pᵣ=Fᵣ+Y₁Fₐ (when Fₐ/Fᵣ≤e)
Pᵣ=0.67Fᵣ+Y₂Fₐ (when Fₐ/Fᵣ>e)

5. Radial equivalent static load

Single Row Tapered Roller Bearings
P₀ᵣ=0.5Fᵣ+Y₀Fₐ If P₀ᵣ<Fₐ take P₀ᵣ=F

Double Row Tapered Roller Bearings
P₀ᵣ=Fᵣ+Y₀Fₐ
Both Fᵣ and Fₐ refer to the total load acting on single row and double row bearings.
Calculation coefficients e, Y, Y, Y, Y, refer to the bearing dimension table.

6. Minimum radial load

In order to prevent the bearing from sliding between the roller and the raceway due to the inertial force of the roller and the cage when the bearing is running at high speed, the bearing must bear a certain load, and its minimum value can be estimated by the following formula: Frmin=0.02Cᵣ
in the formula;
Frmin: minimum radial load kN
Cᵣ: Basic dynamic load rating kN

Single Row Tapered Roller Bearings (Metric Series)

Single Row Tapered Roller Bearings (Inch Series)

Double Row Tapered Roller Bearings