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Truck Trial

Tuesday 27 October 2009, by Clement


See it online

Technical data

Scale (wheels used) 62.4 x 20
Width 18 studs
Total Weight 1000 grams
Transmission 4x4
Motorization 2 motor(s) - Mini-motor 9V

working fake motor
Steering motor

with steering wheel
Onboard Battery Box none

This truck was my first attempt to the Lego Truck Trial challenge. It complies with the "original rules", as it uses 2 9V motors for driving. The suspension is done via articulated chassis.

JPEG - 269.3 kb

Motorization: Due to the scale, the articulated chassis is quite fragile and each axle is driven by its own motor. Motors are linked to a differential via a worm gear, and finally a 3:5 reduction takes place just before the wheel. This final reduction is imposed by the front axle configuration.

Steering: Noting special, but I am pleased with the integration of the motor. The time for steering is just fine. I didn’t use a clutch gear to avoid problems in max steering but I tend to be cautious with my legos, and i make sure I don’t over brake.

Additional stuff: No onboard battery, no steering wheel ... It is quite bulk for a truck :D but it was my first one ... Note that the rear axle is higher than the front one. This is good for design i think, and doesn’t impact on the performaces.

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View online : BS Gallery

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