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[WIP] Realistic tatra 8x8
Zerobricks posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Inspired by the release of the planetary hubs and the diff lock idea from Zetors I decided to create a proper, realistic Tatra 8x8 with the following goals: Use of planetary hubs - Keeping it realistic, so no portal ones No load bearing axles - Most other models used the same drive axle to also hold the half-axles in place which increased friction in the driveline Realistic steering setup - Using a smillar mechanism the real trucks use Differential locks on all wheels - Each axle has it's own diff lock + a central one Here's what I came up with so far... The concept uses the blue bevel gears to transfer the power to the half-axles without spinning the pivot axle. This also allows for wheels to turn at different speeds when cornering. Once the power is transfered to the half-axles an additional gearing is used before the power is delivered to the wheel. Total gearing on half-axles alone is 1:9. Differential locks work by locking one of the differential's output to the main drive axle. As mentioned before all 4 axles have lockable differentials along with the central differential. Steering uses a couple of 9L links turned by the turntable acruated by an 8 tooth gear. This setup provides the front axles with slightly different steering angles. The model will probably powered with 4 of the BuWizz motors. Total gear ratio is 1:21 which should give the model around 900-1000 Ncm torque. I think the concept looks very promising so far and I will keep on building it virtually until I'm confident enough to order parts.