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Steel Clad Aluminum Brake
SCA Brake Heat Dissipation

An important aspect of disc brake design is how to dissipate braking heat as quickly as possible and make
it ready for next braking. The calculation for heat dissipation for a traditional vented disc brake is based on
the sum of convective cooling of rubbing surfaces, convective cooling of ventilation surfaces, and radiative
cooling of rubbing surfaces. The SCA disc brake is a solid rotor and has the same convective cooling and
radiative cooling of rubbing surfaces, but replaces the convective cooling of ventilation surfaces (Eq. 3)
with conductive cooling to a connected aluminum wheel (Eq. 4).
(3)
Where
= heat dissipation by air convection at ventilation surfaces, J/hr

= heat transfer coefficient of convection at ventilation surfaces, J/(hr  
m^2 °C)

= ventilation surface area, m^2

= rotor body temperature, °C

= ambient temperature, °C
= heat dissipation by conduction to metal wheel, J/hr

= rotor body thermal conductivity, J/(hr m °C)

= cross section area of rotor mounting hat side wall, m^2

= rotor body temperature, °C

= wheel temperature at the contact surface with rotor, °C

= height of rotor mounting hat, m (reference letter A in FIG 4)

= half thickness of rotor disc, m


= the distance between the disc middle circle, m (reference letter B in
FIG 4)
Where
(4)
FIG 4. SCA rotor conductive heat transfer
In the SCA disc brake design,                 is significant greater than                of a corresponding cast iron
disc brake, resulting in lower brake temperatures.
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