Page 203 - The Tribology Handbook

Brakes B8

Table 8.5 Required brake areas for various duties
~~
AredPower rnm2/w
Tj$~ical application
Band and drum brakes Dtsc brake (Spot gpe)
Infrequent (time to cool to ambient Emergency brakes; safety brakes 0.5 0.17
temperature between applications)
intermittent General-duty applications, winding 1.7 0.43
engines, cranes, lifts
Heavy Excavators, presses, drop stamps, 3.4-1.2 0.86
.haulage gear

Torque capacity For light-duty work multiply figures on the torque axis
by 3 for band and drum brakes, by 2.5 for disc brakes, for
The torque capacity of band, drum and disc brakes of brakes of a given diameter.
conventional proportions for medium-duty applications is For heavy-duty work divide figures on the torque axis
shown in Figure 8.2 by 2 for band, drum and disc brakes.

100 0100

10 000

[Bin)

'IO .

Figure 8.2 The torque capacity of band, drum and disc brakes of conventional proportions for medium-duty
applications
Band brakes-The width of lining is 4 the diameter Disc brakes-Length of pad & mean diameter, width 9 length - - -
(Rating: 1.7 mm2/W, 2 inz/hp) (Rating: 6.8 mmz/W, 8 in*/hp)
- - -
Drum brakes-The width of lining is 5 the diameter
(Rating: 1.7 mmz/W, 2 in2/hp)
B8.4