Page 106 - TBIS_15194-2019_(EN)_3nd

TBIS 15194:2019

Dimensions in millimetres

1 Drive pulley disc D2≧D1+10

Figure 45 — Drive pulley disc

4.3.14.3 Chain and drive belt protective device

A chain protective device shall, as a minimum, shield the side-plates and top
surface of the chain and the chain-wheel for a distance of at least 25 mm rearwards

along the chain from the point where the chain-wheel teeth first pass between the
side-plates of the chain and forwards round the outer chain-wheel to a horizontal
line passing through the bottom-bracket axle centre (see Figure 46 a)).

A drive belt protective device shall, as a minimum, shield the side and top surface of
the drive belt and the front pulley for a distance of at least 25 mm rearwards along

the drive belt from the point where the tip circle of the pulley is intersected by the
tip line of the belt (line C in Figure 46 b)) and forwards round the front pulley to a
horizontal line passing through the bottom-bracket axle centre (see Figure 46 b)).

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