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Showing results for tags 'independent'.
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Can you give me some examples of lego techic strong and compact 4x4 independent suspension. -
After taking apart my class tractor I was looking at the new hubs, and got a great idea. Why not create a proper tatra concept with the 62.4 mm wheels. Fiddling around in LDD I created a 10x10 concept model: The main features I wanted to have are as following: Seperated drive axle from the weight bearing axle - this way the friction is greatly reduced and efficiency improved Linked steering - realistic, simple and relaible solution for which steering angle is almost unaffected by suspension travel Leaf suspension - a simple leaf sprung suspension which allows smooth travel over bumps without weight transfer First the drive, as you can see the pivot axles are a stud off center of the cenetr drive axle, therebye carrying all the weight. You can also see the 9L link resting on the brown 3.2mm bar acting as a reinforced leaf spring. Notice the half a stud offset between left and right side wheels. Looking at the whole chassis you can see front and rear suspension are pretty much the same, the only difference bing the front steers and has one wheel per axle, while the rear has dual wheels for maximum traction Steering uses small linear actuators and links in order to steer the axles. The steering angles can be adjusted by steering lever length and position of the linkage on the red steering swing. This way the first axle steers at a higher angle than the second. And finally here is the whole truck. I know it does not look very Tatra-ish, but I couldn't resist the bright color (vomit) Rear view: I finished up the truck with a working steering wheel and a fake V8 engine. Here are the final stats: Length: 37 cm Width: 16 cm Height: 15,5 cm Weight: 1200 grams Gear ratio: 1:2,78 powered by a single 1 XL motor Expect a video of the truck soon P.S. I really hope this model will inspire more people to build models at such scale. -
I'm planning on building a cargo trailer for the upcoming Land Rover Defender! Next, I might plan on building the drawbar. -
I don't usually post my work projects here, but every so often there is a special one that I really want to showcase more in detail. Today I want to show you one of my all-time favourite projects, which is packed both full of functionality and a very high level of detail. Before we go into the details, lets' first let's talk about the idea behind it. We (the BuWizz team) have been cooperating with Slovenian AMZS (Slovenian Automobile Association) for a while now and they are the ones who allow us to record the various speed breaking and such events on their polygon. An idea emerged for a project to design and loose replica of their existing Tow Truck which is to be used for education purposes. Here's how one of their tow truck looks like: I decided to use this specific model as an inspiration of my representation and here were the basic starting functions and features: 1:10 scale Capable of lifting and towing an actual 1:10 model like 42125 All Wheel drive Working gearbox Realistic suspension Highly detailed As with most of my projects, i first started working in LDD and this is what the first prototype looked like: I took some liberty with the shape, notably I removed the crew compartment in order to better the lift arm details. As the project progressed, so did the amount of functions, features and details until I ended up with this long list: Motorized with 11 motors Powered by 2 BuWizz 3.0 Pro bricks All wheel drive powered by 4 BuWizz motors Working gearbox with a high and low gear 3 differential locks Independent suspension in the front Solid rear axle in the back which uses 3x13 curved panels as leaf springs Working V8 engine connected to the drive motors Functioning steering wheel linked to the steering rack Motorized lift which can unfold, raise and lock onto thr wheels of the towed vehicle A motorized winch in the rear Working front LED lights Opening doors, hood and compartments Detailed engine bay with battery, air filter and washer fluid Compartments filled with details such as fuel canisters and various tools Other details include cones and fire extinguishers 3D printed braking discs in the front for show Total piece count is around 3060 parts Just over 3 kilograms 51 cm x 24 cm x 22 cm when folded excluding mirrors Capable of lifting and towing a 1:10 scale car like 42125 even up a steep hill Top speed of 10 km/h Here's an overview of the model and the basic mechanical functions: Driveline is powered by 4 BuWizz motors. The motors drive a 2 speed gearbox and a fake V8 engine: Gearbox is powered by a PU M motor and uses 2 mini linear actuators to switch between low, neutral and high gear: Each of the 3 differentials has it's own lock, actuated by a wave selector and powered by a PU M motor: Steering system is powered by a PU L motor and uses two steering racks in order to both steer the wheels and turn the steering wheel: Finally, there are several more PU M motors used to power the rear arm. The main actuators lift the whole arm and are powered by 1 PU M motor: Another PU M motor is used to unfold the lower part of the lift arm using 2 mini linear actuators: Finally another PU L motor is used to lock the wheels with two more mini linear actuators. The driveline is designed in such way that the arm can swing a bit while cornering: The lifting arm had to be designed to be as strong as possible, yet thin enough to slide under the car we want to tow. The final version was under 2 studs high and capable of lifting a 2 kilogram heavy model with ease: With all the details finalized and the parts omptimized in the LDD version, it was time to build the real deal: As mentioned above, the model is full of details that can be accessed by opening the various compartments: The rear view showing the folded tow arm and the 2 large actuators used to lift it: Few more pictures of the model next to the real deal: Of course no Technic photoshoot wouldn't be complete with the most important photo of them all, the underside: The underside was left open and exposed intentionally, so that the gearbox, the differential locks and steering system can be observed. Of course as with all the projects, this one also had some issues, the biggest being the use of 3x11 curved panels as the rear leaf springs. Originally only a single pair was used to support the weight in the rear and the additional load of a towing vehicle, but it soon proved too much for them and over time they ended up breaking. That is why for the final fix, they were doubled, to increase the stiffness and durabilty of the rear axle: Other than this, there were no other major issues with the model. The driveline has yet to skip a gear, the joints are holding (even the small CV joint used in the front left side) and the model ended up being robust enough for some really rough driving. As mentioned at the start of the topic, this is one of my best models to date, I'm really happy with the amount of sheer functionality, features and details I managed to cram in it and it will forever hold a special place in my heart. To wrap up this already long topic, here's a couple of videos of it in action:
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A little video showing a suspension concept: The suspension is tatra-style, not double wishbone. But it is simple and works well enough for my needs. Uses the lego rubber pieces in the place of shock absorbers to save space, and can be built onto a servo motor with as little hassle as possible. I am pleased that the pivot points are all aligned such that the wheels do not steer themselves when the suspension is actuated. Overall a neat concept that I hope to incorporate into my future small-scale MOCs. -
A little somthing i made last weekend. Like the real one it uses independent suspension in front and a live axle at the rear. In order to simplify design the rear axle also houses the 2 drive RC motors and the gearbox, opretaed by the geared 9V motor. Gearbox allows the truck to either climb up smaller hills with 1:3 gear ratio, or to reach some 15 km/h on the straights.
