Table 2 Formulae for computing the thermal resistance.

From: Theoretical and experimental study on the thermomechanical characteristics of double-row angular contact automotive wheel bearings

type

Thermal resistance/(K/W)

Radial conduction thermal resistance

\({R_k}=\frac{{\ln \left( {{d_e}/{d_i}} \right)}}{{2{\text{\varvec{\uppi}}}k{L_c}}}\)

Radial conduction thermal resistance of the rolling element

\({R_k}=\frac{1}{{{\text{\varvec{\uppi}}}k{L_c}}}\)

Axial conduction thermal resistance

\({R_k}=\frac{{{L_c}}}{{kS}}\)

Convective thermal resistance

\({R_h}=\frac{1}{{A{h_v}}}\)