Page 131 - Rollingbearings
P. 131
Operating temperature and speed
B 5 Operating temperature
and speed
Bearing operating temperature and heat low 130
Bearing size, operating temperature and lubrication
conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131
Thermal equilibrium . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131
Generated heat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131
Dissipated heat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132
Bearing friction, power loss and starting torque . . . . . 132
SKF model of bearing friction . . . . . . . . . . . . . . . . . . . . . . . 132
Starting torque . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133
Estimating bearing operating temperature . . . . . . . . . . 133
Estimating heat dissipation from SKF plummer (pillow)
blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133 Operating temperature and speed
Cooling via circulating oil . . . . . . . . . . . . . . . . . . . . . . . . . . 134
Further temperature-related checks . . . . . . . . . . . . . . . . . 135
Speed limitations 135
Approximate thermal speed limit based on ISO standard
conditions 135
Adjusted reference speed 135
Mechanical speed limit 135 B.5
Speeds above the reference or limiting speed 136
129
