Crazy axles idea design Hi, I am new to the forum but not to the hobby. I have been designing, constructing and piloting RC cars, planes and helicopters. I designed my first RC car when I was 13 years old and that was 35 years ago... I lately come interested on Rock-Crawlers, mainly on the superclass, because I think it is the more technically advanced. After some research I come to some conclusions about Crawlers that I hope they are correct, you let me know: - Manny of characteristics of a Rock-Crawler are very different than from a speed-racing car. - Vehicle weight should be as low as possible. - CG should be as low and forward as posible. In order to achieve that weights are installed on the front wheels. - As much suspended mass the better. - As much turning radius the better. - Brushless motors are not well suited for the task unless they are sensored (difficult to find) So in order to meet those parameters I come up with this design/idea of how to install all equipment (weight) inside of the wheel rim. It is just a quick render and before going further with it i will like that you have a look to it and give your opinion/suggestions and if I you think it can work. If I go forward with this I will need some assistance on setups and other details and hope you can help me. Let me know if you can see the pictures, if not I will link them differently. https://scontent-mad1-1.xx.fbcdn.net...4d&oe=5AE779B3 https://scontent-mad1-1.xx.fbcdn.net...98&oe=5AF7CDE5 Equipment planing to use: 4 x 380/385 brushed motors 4 x 20-25A ESCs 2 x 7.4V (2S) 800-850mAh batteries (one on each front wheel) 4 x 15-20Kg Standard size servo |
Re: Crazy axles idea design Sound like motor on wheel system ? |
Re: Crazy axles idea design Here ya go.. a little inspiration! Bc-brian of Lattice Innovation (a vendor here, that makes the Sickest hubs on the market, Shift hubs) designed this little beauty.. http://www.rccrawler.com/forum/unlim...ing-crazy.html |
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Re: Crazy axles idea design Calculating the steering geometry, actually not an easy task. Thanks that Ackerman Geometry is not needed :ror: https://scontent-mad1-1.xx.fbcdn.net...bb&oe=5AE5BF0B About 70º, not bad I think. https://scontent-mad1-1.xx.fbcdn.net...1d&oe=5AE38243 |
Re: Crazy axles idea design Gear box taking shape. I will 3Dprint it. Now needs servo, and battery support, Kingpin hears and some more details. https://scontent-mad1-1.xx.fbcdn.net...b0&oe=5AF1E9F3 |
Re: Crazy axles idea design What size wheel are you using to be able to fit a 380 motor and gear box inside like that? |
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Moreless the same wheels sizes as other Superclass that are around. |
Re: Crazy axles idea design First iteration of the gearbox finished, lets see if I can print it latter today, in order to see if everything fits and check tolerances... Inner side (Servo, motor, battery) https://scontent-mad1-1.xx.fbcdn.net...94&oe=5AF25DEA Outer side (Space for the ESC and weight box) https://scontent-mad1-1.xx.fbcdn.net...63&oe=5AECD127 |
Re: Crazy axles idea design Its already been done. You might want to do some reaearch. |
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Re: Crazy axles idea design Keep up the good work, always to see cool stuff that continues to innovative. |
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Good work. |
Re: Crazy axles idea design I can’t wait to see how this pans out. Looks like it will be a great build. |
Re: Crazy axles idea design This looks so sweet!! What kind of gear reduction you getting out of that worm drive, somewhere around 30:1? Cant wait to see how this turns out. |
Re: Crazy axles idea design Hey f@#$heads did i tell the guy not to do it or offer an opinion? No i told him its been done and to do research. There is literally no reason to reinvent the wheel when you can go do research on how it is done. |
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Try not to inject your bias when you read. A statement is a statement and nowwhere in mine does it offer an opinion. You people want it to be negative so you can have something to post about. |
Re: Crazy axles idea design Just looking at the models posted it is pretty obvious the research has been done. :lol: |
Re: Crazy axles idea design Thank you all for your kind words. Yeah, I have done quite of research in order to end up with this. Actually a very helpful one was this thread from BC-Brian here: http://www.rccrawler.com/forum/unlim...ing-crazy.html I was first thinking on using brushless motors as there is a huge offer and their higher power density, but that thread made me change mind and go brushed way, because I realized that a brushless motor without sensors will not give enough torque at 0-low rpms. Even with a sensor motor it will be a bit complicated due to the great amount of cables (7 from each motor) Quote:
Planning to use this motors reference RS-380PH-4045 from Mabuchi, if I can find them: https://www.mpja.com/download/17946md.pdf If not there is similar KV 385 motors from other brands that may be even better suited than the 380. It will be a test error thing… I did not had time to print the gear box test, it will have to wait till the weekend probably. Anyway I had time to work on the axles design. Still do not know where to place the shock absorbers, do you think that the lower links rods is a good place?. Note that the rods will be straight, they do not need to be bended as they are on a very high position. Axles taking shape: https://scontent-mad1-1.xx.fbcdn.net...44&oe=5AE79115 |
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