Lubrication grooves and holes

 

Lubrication grooves and holes

Spherical roller bearings are provided with a lubrication groove and holes in the outer ring, excepting those of series 213. Designation suffix W33 is used to identify this feature on bearings. The dimensions of the groove, bore diameter and their number depending on the dimension series are given in table 5.

 

Heat treatment

Spherical roller bearings with outside diameter D>240 mm of all series given in this catalogue are stress revealed. Therefore, they can be used up to an operating temperature of +200?C.The hardness of the rings should not be lower than 59 HRC. Small sized bearings operate normally at temperatures up to +120?C.

 

Axial load for bearings mounted on adapter sleeves

If the spherical roller bearings are mounted on a smooth shaft using an adapter sleeve, without side support, the axial load carrying capacity depends on the friction be-tween shaft and sleeve.

Considering that the mounting is correctly done, the permissible axial load can be accurately enough deter-mined using the following equation:

F_{a max} = 3 Bd, kN

where:

F_{a max} - maximum permissible axial load, kN,

B - bearing width, mm,

d - bearing bore diameter, mm.

 

 

Equivalent dynamic radial load

P_r = F_r + Y₁F_a, kN,   for F_a/F_r <=e,

P_r = 0,67 F_r + Y₂F_a, kN,  for F_a/F_r >e,

The values of the factors depending on the bearing type can be found in bearing tables

 

Equivalent static radial load

P_0r = F_r + Y₀F_a, kN

The value of the factor Yo depending on the bearing type can be found in bearing tables.

 

Abutment dimensions

For a proper location of bearing rings on the shaft and housing shoulder respectively, shaft (housing) maximum connection radius r_{u max} should be less than bearing minimum mounting chamfer r_{s min}.

Shoulder height should also be properly sized in case of bearing maximum mounting chamfer.

The values of the connection radii and support shoulder height are given in table 6.

 

 

The mounting dimensions for bearings with withdrawal sleeves are given in table 7.