Page 224 - The Tribology Handbook

W~ee~s, rails and tyres B1 I

SPEED, m/s
0 $0 20 30 40 50
I I I I t I
DRY
-i"F

4 3mn
c RH f"~""?
ROUGH HARSH

0.5

0.2

sp B.R. ADVANCED
to-'
*-.- sp

RESISTANCE

SPEED, km/h
Figure 11.6 Rolling resistance, peak adhesion or traction, and skidding friction coefficienfs are plotted against
speed for passenger-car tyres on wet and dry road surfaces of various typical characteristics, for solid tyres
and for ~~i~-i~ne rolling stock
railway
I-
5
0
U
L
w
0
0
z
E!
-
!-
u
tc
U
z
0
cu Figure 11.7 Typical adhesion versus tye siip/roll
v)
I ratio for treaded rubber tyres on wet and dry
a
6 surfaces. 0 per cent signifies pure rolling, 100 per
0 25 51 0 75 100 cent pure sliding
RUBBER TYRE SLIP/ROLL RATIO, percent
B11.7