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Showing results for tags 'u5000'.
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[MOC] Unimog U4000/5000 1:21 Scale
Thirdwigg posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
In what now seems to be a yearly occurrence, I have started another Unimog. The reception I received from last years U423 was so good, that I thought I would continue in the theme at some point. Then someone suggested I do a U5000 with a camper body. I'm not sure the camper body will happen but the build ideas was intriguing enough and I was up for another build, so I decided to take up the challenge. I wanted to build to follow in the footsteps of the U423, so I kept the scale the same, which is roughly the same as the Anthem/Transporter 1:21 standard. The U5000 usually has a 3250mm or 3850mm wheelbase. So the wheel base will be 20 studs for the short wheelbase, and 24 studs for the long wheelbase. 15 studs is the width. As is often the case, I built a little placeholder body, and then set it aside for a number of weeks. But the build kept sitting without any changes, because I could not come up with any idea to set the build apart. The U423 works well because of all the attachments you can add, which gave some direction the chassis. The U5000 basically has tipper bed, or a camper body, or a crane with a bed. There are firetruck options that look good, but basically are a large container filled with tools on the back. Since I could not come up with anything, I started to take the build apart, and I took these pictures. Then I had an idea while browsing some images. Many of the Unimog rebuilds and Unimog adventure packages add winches to their trucks. This gave me the inspiration I needed, so I jumped back into the build. This also solidified the functions intended: Steering with HOG RWD with portal axle Rear suspension Two speed transmission Engine Bed tipper Front winch with lock Rear winch with lock Bed attachment points I quickly built another draft, and decided on a simple single cab with a tipper bed. We will see where this project goes, but I am happy enough with what I have so far, that I know it will turn into something. Maybe it will be a single build, and maybe it will turn into an extensive "system" project just like the U423. Any suggestions to improve this build or any additions to make this more of a system build are welcome. -
[MOC] Unimog U5000 Trial Truck
Teo LEGO Technic posted a topic in LEGO Technic, Mindstorms, Model Team and Scale Modeling
Hey everyone! After almost a year and a half of working on it whenever I had time, my model of a Unimog U5000 truck is finally complete. It has the following functions: 4x4 Drive with 2 PF XL motors Steering with PF M motor and linear actuator Remote diff locks, front and back, using pneumatic actuators Remote 2-speed high-torque gearbox BuWizz power More photos on my BrickSafe: https://bricksafe.com/pages/Teo_LEGO_Technic/unimog-trial-truck The whole idea of this model was to build a truck that could both travel at a fairly fast speed as well as work very well offroad, which meant it needed a gearbox. It also meant it needed differential locks so that turns could be taken smoothly at high speed with diffs unlocked, and offroad terrain could be tackled better with diffs locked. The main goal of this model was to create a drive train that wouldn't allow any gear slippage or breaking even under tension in low gear. My solution for this was to use @Sariel's heavy-duty gearbox (http://sariel.pl/2011/02/2-speed-heavy-duty-linear-gearbox/), as well as the new differentials from the 43109 Top Gear car. However even those differentials can't take as much torque as I wanted to put on them, and neither can the universal joints leading to the axles. For this reason, I decided to speed up the transmission before reaching the universal joints and differentials to reduce torque, then slow it back down afterwards between the diffs and the wheels. This would cause a bit of power loss to friction due to the increased number of gears, but it would reduce the torque on the sensitive components and allow me to send more total torque to the wheels. The result is that the 2 powerful XL motors are sped up 5.01 times or 1.8 times (in high and low gear respectively) before reaching the diffs and universal joints, and then slowed down 11.67 times at the wheels. Therefore the final gear ratios in low and high gear are as follows: High gear - 2.33 : 1 Low gear - 6.5 : 1 The result is that the drivetrain is indestructible and never breaks even when run with a BuWizz on ludicrous mode and the wheels come to a standstill. The most complicated part of this build was fitting all of the functionality in the front axle - linear actuator steering placed close to the pivot to increase the range of motion, lots of gear reduction, portal axles, and a differential locking mechanism. Although the result is quite good in my opinion - thanks @Zerobricks for the custom portals - the final construction wasn't as sturdy as I would have liked, and this was the main issue with the final model. The steering has less power than I would have liked with the small actuator, and the custom portal axles bend outwards under pressure when steering over rugged terrain. Overall however I'm quite satisfied with the final result Thanks also to @functionalTechnic for the advice, and to everyone else who contributed to the WIP thread: Enjoy! - Teo