ISO Combination 1: truck + dolly + A-semi

ISO Combination 1: truck + dolly + A-semi
Cd = Ud + Wd; Smax = 1000kg
T =
Technically permissible maximum total mass (t) of the towing vehicle transmitted to the ground by the axles. (Permissible total weight of the truck in t)
Cd =
Mass (t) transmitted to the ground by the axles of the converter dolly including <strong>U<sub>d</sub></strong> (t). (Sum of the axle loads of the dolly t)
Rb =
Mass (t) transmitted to the ground by the axles of the semi-trailer loaded to its maximum total design mass. (Sum of the permissible maximum axle loads of the trailer in t)
Ud =
Mass (t) imposed vertically on the fifth wheel of the converter dolly. (Imposed load that affect on the fifth wheel dolly)
Wd =
Dolly tare mass (t).
L =
Theoretical dolly drawbar length (m), i.e. the distance between the center of the drawbar eye and the center of the axle assembly.
For a correct calculation only decimal places are separated with points.
Drawbar coupling:
D2 =
V2 =
Fifth wheel dolly:
D =
GCW:

1 Applicable to dollies with a rigid drawbar.
2 For dollies with a rigid drawbar, the Dc-rating shall exceed this calculated D-value.

ISO Combination 2: tractor + A-semi + centre-axle trailer

ISO Combination 2: tractor + A-semi + centre-axle trailer
T =
Technically permissible maximum total mass (t) of the towing vehicle transmitted to the ground by the axles. (Permissible Total weight of the truck in t)
C =
Mass (t) transmitted to the ground by the axles of the center axel trailer.
Rb =
Mass (t) transmitted to the ground by the axles of the semi-trailer loaded to its maximum total design mass.
Ut =
Mass (t) imposed vertically on the fifth wheel of the tractor. (Imposed load that affects the truck in t)
L =
Theoretical drawbar length (m) of center axel trailer, i.e. the distance between the center of the drawbar eye and the center of the axle assembly.
X =
Length (m) of the loading area of the center-axle trailer.
a =
Equivalent vertical acceleration in the coupling point, dependent on the kind of suspension on the rear axles of the towing vehicle including a constant factor. Air suspension and or equivalent a=1.8m/s2 and other suspension a=2,4m/s2.
For a correct calculation only decimal places are separated with points.
Drawbar coupling:
D3 =
V =
Fifth wheel dolly:
D =
GCW:

3 The Dc-rating of the drawbar coupling equipment shall exceed this calculated D-value.

ISO Combination 3: tractor + A-semi + centre-axle trailer

ISO Combination 3: tractor + A-semi + centre-axle trailer
Cd = Ud + Wd; Smax = 1000kg
T =
Technically permissible maximum total mass (t) of the towing vehicle transmitted to the ground by the axles. (Permissible total weight of the truck in t)
Cd =
Mass (t) transmitted to the ground by the axles of the converter dolly including Ud. (Sum of the axle loads of the dolly t)
R1b =
Mass (t) transmitted to the ground by the axles of the first semi-trailer loaded to its maximum total design mass. (Sum of the permissible axle loads of the first semi-trailer in t.)
R2b =
Mass (t) transmitted to the ground by the axles of the second semi-semi loaded to its maximum total design mass. (Sum of the permissible axle loads of the second semi-trailer in t.)
Ud =
Mass (t) imposed vertically on the fifth wheel of the converter dolly. (Imposed load that affect on the fifth wheel dolly)
UT =
Mass (t) imposed vertically on the fifth wheel of the tractor. (Imposed load that affects the truck in t)
Wd =
dolly tare mass (t).
L =
Theoretical dolly drawbar length (m), i.e. the distance between the center of the drawbar eye and the center of the axle assembly.
For a correct calculation only decimal places are separated with points.
Drawbar coupling:
D2 =
V2 =
Fifth wheel dolly:
D =
GCW:

2 For dollies with a rigid drawbar, the Dc-rating shall exceed this calculated D-value.

ISO Combination 4: truck + centre-axle trailer + centre-axle trailer

ISO Combination 4: truck + centre-axle trailer + centre-axle trailer
T =
Technically permissible maximum total mass (t) of the towing vehicle transmitted to the ground by the axles. (Permissible total weight of the truck in t)
C1 =
Mass (t) transmitted to the ground by the axles of the CAT1. (Sum of the axle loads of the CAT1 in t)
C2 =
Mass (t) transmitted to the ground by the axles of the CAT2. (Sum of the axle loads of the CAT2 in t)
X1 =
Length (m) of the loading area of the CAT1.
L1 =
Theoretical drawbar length (m) of CAT1, i.e. the distance between the center of the drawbar eye and the center of the axle assembly.
t1 =
Distance (m) from the center of axles of CAT1 to its rear coupling point.
X2 =
Length (m) of the loading area of the CAT2.
L2 =
Theoretical drawbar length (m) of CAT2, i.e. the distance between the center of the drawbar eye and the center of the axle assembly.
a1 =
Equivalent vertical acceleration in the coupling point, dependent on the kind of suspension on the rear axles of the towing vehicle including a constant factor. Air suspension and or equivalent a=1.8m/s2 and other suspension a=2,4m/s2.
a2 =
Equivalent vertical acceleration in the coupling point, dependent on the kind of suspension on the rear axles of the towing vehicle including a constant factor. Air suspension and or equivalent a=1.8m/s2 and other suspension a=2,4m/s2.
For a correct calculation only decimal places are separated with points.
Drawbar coupling:
Dc3 =
V3 =
GCW:

3 The Dc-rating of the drawbar coupling equipment shall exceed this calculated D-value.

ISO Combination 5: tractor + link trailer + A-semi (B-train)

ISO Combination 5: tractor + link trailer + A-semi (B-train)
T =
Technically permissible maximum total mass (t) of the towing vehicle transmitted to the ground by the axles. (Permissible total weight of the truck in t)
R1b =
Mass (t) transmitted to the ground by the axles of the link-trailer loaded to its maximum total design mass. (Sum of the permissible axle loads of the first semi-trailer in t.)
R2b =
Mass (t) transmitted to the ground by the axles of the semi-trailer loaded to its maximum total design mass. (Sum of the permissible axle loads of the second semi-trailer in t.)
UT =
Mass (t) imposed vertically on the fifth wheel of the tractor. (Imposed load that affects the truck in t)
Ub =
Mass (t) imposed vertically on the fifth wheel of link-trailer.
For a correct calculation only decimal places are separated with points.
Fifth wheel B-train:
D =
GCW:

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