ABSTRACT
M Bearing friction torque (total) Nmm (in. lb) Mf Bearing friction torque due to roller end-flange load Nmm (in. lb) Ml Bearing friction torque due to load Nmm (in. lb) Mv Bearing friction torque due to lubrication Nmm (in. lb) n Rotational speed rpm
q Heat flow/unit area W/mm2
(Btu/hr-in.2)
r Raceway radius mm (in.)
T Thrust bearing thickness mm (in.)
v Surface velocity mm/sec (in./sec)
Z Number of rolling elements
a Contact angle rad, 8 g D cos a/dm no Lubricant kinematic viscosity centistokes v Rotational speed rad/sec
Subscripts
i Inner ring or raceway
m Cage motion or orbital motion of rolling element
o Outer ring or raceway
u Thermal reference speed condition R Rolling Element
Ball and roller bearings are used to support various kinds of loads while permitting rotational
and translatory motions of a shaft or slider. In this book, treatment has been restricted to
shaft or outer-ring rotation or oscillation.
