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Q Can you suggest formulae for cal

12th January 1968
Page 69
Page 69, 12th January 1968 — Q Can you suggest formulae for cal
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Which of the following most accurately describes the problem?

culating the g factor to be expected from known friction areas, gross loads, tyre size, length of bell crank, area of diaphragms, air pressures, etc, for a given axle and conversely the friction area required given the known g factor.

AIt is possible to calculate the braking

efficiency of a vehicle from the theoretical braking efforts at each wheel. But to obtain such figures it is necessary to know the "shoe factor" of the brake units as well as air pressure, diaphragm size, friction material characteristics and area, etc.

The shoe factor is necessary to relate the actuating efforts with the braking effort at the drum and this depends on the type and design of brake units. Provided all the necessary information is available, the required frictional areas, diaphragm sizes, etc, can be obtained.

But in all these calculations it is also necessary to take into account weight transference. In other words the dynamic condition is quite different from the static.

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