3
Proper usage
3.3
Design
The fifth wheel coupling is designed in combination with the vehicle
by the vehicle manufacturer (the design must comply with Regula-
tion ECE R55-01, Annex 7).
In addition to the imposed load, the D value is a criterion for the load
capacity of fifth wheel couplings and mounting plates.
It can be calculated using the following formula:
D
=
Drawbar value [kN]
g
=
9.81 m/s
2
R
=
Permissible gross weight of the semi-trailer [t]
T
=
Permissible gross weight of the tractor unit including U
[t]
U
=
Maximum imposed load [t]
D = g x [kN]
0.6 x T x R
T + R - U
Sample calculation:
R
=
33 t
T
=
17 t
U
=
10.5 t
D = 9,81 x = 83,6 kN
0,6 x 17 x 33
17 + 33 - 10,5
Please see the adjacent table for the permitted load data for JOST
fifth wheel couplings. This information is also listed in the relevant
JOST catalogue sheets and stamped on the type plate. This load da-
ta is applicable for proper usage pursuant to regulation ECE R55-01.
EN
JSK 36 & JSK 37
MUB 002 004 M01
(REV-C)
04-2019
7
JOST IND (REV-A) 06-2019
JSK 39
AIS-091-1).
(Just for reference)
AIS-091-01.
Summary of Contents for JSK 39
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