9
0.0.684.91
0.0.684.91
3.1 Explanation of operating data and example configuration
4. Commissioning and operation
Refer to DIN 15172 when calculating the trailer load of industrial truck tugger trains. VDI 3973 builds on this DIN standard to offer practical calculations for maxi-
mum trailer load under operating conditions and set out parameters that need to be factored in when determining the maximum length of tugger trains. If there are
any uncertainties regarding the conditions of the routes to be used or likely peak loads, test runs should be carried out and documented in line with VDI 3973 and
DIN 15172.
During these tests, the company must identify the permissible trailer loads and tractor unit/trailer combinations for the relevant deployment site and scenario and
make drivers aware of these in appropriate user manuals.
Before setting off, the driver must ensure the trailers are properly coupled. The manufacturer’s safety precautions and user guide must be observed.
A distinction is made between the maximum trailer load during traction and during braking as appropriate to the characteristics of the tractor unit and local
conditions.
The trailer load for traction and braking operations that is calculated in this way is equal to the sum total of all the loads in the train and also acts on the first
Drawbar.
Besides calculating the potential trailer load for the tractor unit, users must also analyse the Drawbar Coupling solution.
Example:
m = F / a = 3000 N / 2.5 m/s
2
= 1200 kg = 1.2 t
m: Maximum trailer load of the Drawbar / Drawbar Coupling combination
F: Maximum tensile load of the Drawbar D25-610 (0.0.674.29) and Drawbar Coupling D25-30 (0.0.674.28) combination
a: Actual, genuine braking deceleration / acceleration (determined through experimentation or as per DIN 15172/VDI 3973)
This tugger train is permitted to pull a maximum of 1.2 t regardless of the tractor unit’s maximum tensile load!
• Check the Drawbar for visible damage prior to installation.
• Drawbar D25-686, Self-Lifting should preferably be fitted to standard Profiles 8 80x40 that have been installed in an upright orientation. It should be
fastened with 4 DIN 912 M8, 10.9 screws and 4 T-Slot Nuts 8 M8 (Fastening Set 8 6-8, 0.0.684.91, see picture).
Tightening torque: 25 Nm
Factor the groove load-bearing capacity of the profiles into your calculations for total load (item24.de/en).
• If fastening Drawbar D25-610 to a Profile 8 40x40, use 2 M8, 10.9 screws and 2 T-Slot Nuts 8 M8 (Fastening Set 8 6-8, 0.0.684.91, see picture).
Tightening torque: 25 Nm
When calculating maximum load, factor in the maximum load-carrying capacity of the fasteners and profiles (item24.de/en).
• Please note that an eccentric fixing will increase load (torque is generated because the point where traction takes effect and the fixing are not on one
level).
• To avoid creating a weakness that could result in breakage during an emergency braking manoeuvre, do not subject the Drawbar to excessive bending
loads during start-up and operation, e.g. by standing on it.
