efferman Posted November 12, 2014 Author Posted November 12, 2014 (edited) A steered and independent suspended twin axle setup, made for piece x873c01 or 32186 lxf file Edited November 12, 2014 by efferman Quote
Leif Posted November 12, 2014 Posted November 12, 2014 A steered and independent suspended twin axle setup, made for piece x873c01 or 32186 lxf file not too bad! I guess the doohickey on top is a replica of a PF server motor Quote
Bevel L Posted November 12, 2014 Posted November 12, 2014 not too bad! I guess the doohickey on top is a replica of a PF server motor We have new motor Quote
Leif Posted November 14, 2014 Posted November 14, 2014 We have new motor I am a computer guy, Freudian slip you know Quote
efferman Posted November 16, 2014 Author Posted November 16, 2014 please note that the gearracks are in "front" of the axle. lxf lxf Quote
efferman Posted November 21, 2014 Author Posted November 21, 2014 Two independent suspended and driven steering axles. Both axles have a different steering angle lxf Quote
Epic Technic Posted November 21, 2014 Posted November 21, 2014 I shall share my smaller scale axle. It has tatra suspension but the 'wishbones' don't rotate around the center. It uses a rubbery 11 stud long flex axle for the 'spring' on each side. It does not have a diff. Here is the LDD link Quote
izorn Posted November 23, 2014 Posted November 23, 2014 (edited) Here is MacPherson strut suspension for my new project, Subaru SVX. lxf Please tell me how to make pics in LDD w/o background Edited November 23, 2014 by izorn Quote
Jeroen Ottens Posted November 23, 2014 Posted November 23, 2014 Please tell me how to make pics in LDD w/o background ^K (ctrl-K) to make a screenshot without background Quote
Leif Posted November 25, 2014 Posted November 25, 2014 (edited) This is something I been cooking up the last days. It is also one of my first creations in LDD so bear with me LXF file is included at the bottom, link to my dropbox. please let me know if troubles or if something can be made easier. Fully independent and driven. strong - no CV joints! Ackermann geometry. No bump steering, all geometry aligned. Ideas stolen with pride from several posts here at the forum, SNIPE among others, thanks! Still, some ideas I think are my own Room for improvent, steering links are unnessacary high and wobbly but I had to move away from differential, can be redone and maybe will be! Steering geometry can be placed really near wheel hubs, even PP wheels and tires. This was a mandatory demand from me. I have build it as well and I am in progress of the second, duplicate (mirrored) in order to build a crawler so we will see outcome of real life build quite soon I hope. https://www.dropbox....ering3.lxf?dl=0 Edit: Improved it right away (in theory) and added some missing axles! Edited November 25, 2014 by Leif Quote
Zerobricks Posted November 25, 2014 Posted November 25, 2014 This is something I been cooking up the last days. It is also one of my first creations in LDD so bear with me LXF file is included at the bottom, link to my dropbox. please let me know if troubles or if something can be made easier. Fully independent and driven. strong - no CV joints! Ackermann geometry. No bump steering, all geometry aligned. Ideas stolen with pride from several posts here at the forum, SNIPE among others, thanks! Still, some ideas I think are my own Room for improvent, steering links are unnessacary high and wobbly but I had to move away from differential, can be redone and maybe will be! Steering geometry can be placed really near wheel hubs, even PP wheels and tires. This was a mandatory demand from me. I have build it as well and I am in progress of the second, duplicate (mirrored) in order to build a crawler so we will see outcome of real life build quite soon I hope. https://www.dropbox....ering3.lxf?dl=0 Edit: Improved it right away (in theory) and added some missing axles! Its nice, but the steering links are way too high and that axle joiner will in reality just slip out. You need to bring it closer to the center of the hub. Quote
Leif Posted November 25, 2014 Posted November 25, 2014 (edited) Its nice, but the steering links are way too high and that axle joiner will in reality just slip out. You need to bring it closer to the center of the hub. Thanks, btw I apologize for posting half done things in the axle thread, this thread should, I think, mostly consist of finished, proven, designs. not ideas! I have done some redesign now and I risk getting into "half stud galore" with the setup. Got some ideas still to build and test with wheels and tyres, and I think this is one of the best, when finished, when it comes to geometry, which I aim for really hard. Edited November 25, 2014 by Leif Quote
efferman Posted January 21, 2015 Author Posted January 21, 2015 A modification of the 9398 axles to fit my torsen diff in it lxf Quote
deehtha Posted March 25, 2015 Posted March 25, 2015 To avoid the dread 2l axle sliding into the female cv part, i do this: I'm still working on the rest of the suspension module. Using this does make it a little longer than efferman's, but you can still get 11 wide at the towballs. And this thread should definitely be stickied. Quote
Kiwi_Builder Posted June 13, 2015 Posted June 13, 2015 For my upcoming MOC I have been working on air suspension for the front axle of a 19-wide truck. It uses two of the five stud long pneumatic cylinders, giving it more travel than using standard Lego shock absorber along with having adjustable stiffness and the ability to be lowered completely which is useful on buses. The axle has Ackermann geometry, with the driveshaft for the steering connecting to the chassis instead of the axle's framework using the six stud long suspension arms or whatever they're called which makes the driveline far simpler and easier to connect to the chassis. Unfortunately due to the technique I used to connect the six stud long suspension arms to the steering frame causes the turning circle to reduce, but this problem can be solved by modifying the upper front brace for the steering to remove anything from attaching to the upper pin on the steering frame. So basically the problem is that the steering geometry is limited at the same as second steering axles on models because the connection to the ball pin is the same as on the longer spacing on the steering rack (probably just over-explained something that could be put simply and everyone understands ). Now, less talky, more showy At the wheel it has a range of three studs travel, which I consider pretty decent for a road vehicle in this scale. Ideal ride height is at half extension when loaded so that it can manage both bumps and potholes. (And no, the ceiling is not purple) Bit of a look to the inner workings (And I only just worked out that it would have been a good idea to take the wheels off so I could get a good photo of the actual axle/suspension setup) A look at the steering system, the photo above demonstrates its less than ideal steering lock which can be improved with modification. As always there are more photos on my Bricksafe: http://bricksafe.com/pages/Kiwi_Builder/Technic/Components/Air%20Suspension/Front%20Axle And if there is enough interest I could create an LXF of it to share with you. Quote
efferman Posted June 14, 2015 Author Posted June 14, 2015 19 wide, driven, steered and suspended. unfortunately the 5x7 frame is not able to mount in ldd Quote
skppo Posted June 14, 2015 Posted June 14, 2015 Here my front suspension for a muscle car project. I tried to make it like the real thing, the two 15m beams are the main chassis beams. Surprisingly rigid with all that space to fit a V8 in I'm using 81.6x34 tires fitted on 56mmx43mm wheels. MuscleCarFront.lxf Quote
efferman Posted June 14, 2015 Author Posted June 14, 2015 twin axle for 108mm 1,9" tires. Leafspring fakes, planetary gears. scale roundabout 1:10 http://www.doktor-brick.de/index.php/Attachment/5189-Magirus-achse-lxf/ Quote
ord Posted June 25, 2015 Posted June 25, 2015 (edited) Here's an idea I had for a live axle with sprung linkarms, to soften front/rear collisions. Top shaft is steering, bottom shaft is drive Edited June 26, 2015 by ord Quote
Rockbrick Posted June 26, 2015 Posted June 26, 2015 My front live axle after not seeing too many around - then lego came out and did it better on the Arocs and something i'm working on .... no ackerman yet.... Quote
MaxSupercars Posted June 26, 2015 Posted June 26, 2015 The last image... the pivot point is too far from wheel midpoint... not good for steering... Max... Quote
Gnac Posted June 26, 2015 Posted June 26, 2015 [...] then lego came out and did it better on the Arocs I dunno, I like the shock absorber placement here - it's really compact. It would be very easy to build whatever you want on top of that, free of the consideration of having to plan where to anchor the suspension. Quote
Gnac Posted June 28, 2015 Posted June 28, 2015 (edited) A driven, steered axle with independent suspension, suitable for a 4x4x4 vehicle. 19M wide excluding wheel bearings. ------------------------------------------------------------------------------- Notes / considerations: Green is drive, orange is steering. Turning radius is limited by the red 3M beams on the rack, so that the CV joints don't fudge up. The assembly to connect the rack and the 6M steering links is more flexy than I'd like. Suspension travel is roughly 2M, and the action is rather soft. The gap between the suspension support pylons is wide enough to accomodate a fake straight engine or XL Motor. LXF ------------------------------------------------------------------------------- A real-world test with identical axles at either end of a chassis show some slowdown when turning, but there were no scary mechanical noises from the CV joints, so I call it a success! EDIT: The test chassis used two XL Motors as well as the Servo Motor running from a LiPo battery box, and since the servo is unable to complete a full 90° either way, perhaps the slowdown was due to increased current draw? Edited June 28, 2015 by Gnac Quote
MaxSupercars Posted June 28, 2015 Posted June 28, 2015 Hmm... I'm totaly disappointed with combination of CV joints and driven axle... Totaly unusable by greated steering angles... I wanted to make AWD car but I canceled it... So I use only RWD and let front axle only for steering with big steering angles... Max... Quote
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