01-13-2018, 05:35 AM | #1 |
Pebble Pounder Join Date: Jan 2018 Location: Spain
Posts: 146
| 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. 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 |
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01-13-2018, 05:41 AM | #2 |
RCC Addict Join Date: Nov 2016 Location: 1972 born Christian, Chinese.
Posts: 1,321
| Re: Crazy axles idea design
Sound like motor on wheel system ?
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01-13-2018, 05:58 AM | #3 |
I wanna be Dave Join Date: Jan 2012 Location: williamsport
Posts: 8,649
| 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.. BC-Brian's Real life Unlimited MOW with a dash of something crazy |
01-15-2018, 06:16 PM | #4 | ||
Pebble Pounder Join Date: Jan 2018 Location: Spain
Posts: 146
| Re: Crazy axles idea design Quote:
Quote:
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01-15-2018, 06:36 PM | #5 |
Pebble Pounder Join Date: Jan 2018 Location: Spain
Posts: 146
| Re: Crazy axles idea design
Calculating the steering geometry, actually not an easy task. Thanks that Ackerman Geometry is not needed About 70º, not bad I think. |
01-17-2018, 07:14 PM | #6 |
Pebble Pounder Join Date: Jan 2018 Location: Spain
Posts: 146
| 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. |
01-17-2018, 07:26 PM | #7 |
Quarry Creeper Join Date: Dec 2012 Location: Pioneer, 95666
Posts: 397
| 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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01-18-2018, 06:46 AM | #8 | |
Pebble Pounder Join Date: Jan 2018 Location: Spain
Posts: 146
| Re: Crazy axles idea design Quote:
Moreless the same wheels sizes as other Superclass that are around. | |
01-22-2018, 07:23 AM | #9 |
Pebble Pounder Join Date: Jan 2018 Location: Spain
Posts: 146
| 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) Outer side (Space for the ESC and weight box) |
01-22-2018, 09:23 AM | #10 |
RCC Addict Join Date: May 2015 Location: Price Twp.
Posts: 1,291
| Re: Crazy axles idea design
Its already been done. You might want to do some reaearch.
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01-22-2018, 12:11 PM | #11 |
I wanna be Dave Join Date: Aug 2004 Location: Tri-cities, WA
Posts: 4,831
| Re: Crazy axles idea design |
01-22-2018, 08:38 PM | #12 |
I wanna be Dave Join Date: May 2010 Location: Stowe
Posts: 3,987
| Re: Crazy axles idea design
Keep up the good work, always to see cool stuff that continues to innovative.
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01-22-2018, 09:57 PM | #13 |
RCC Addict Join Date: Oct 2006 Location: crawlifornia
Posts: 1,612
| Re: Crazy axles idea design |
01-22-2018, 10:21 PM | #14 |
Rock Crawler Join Date: May 2012 Location: Australia
Posts: 517
| Re: Crazy axles idea design
I can’t wait to see how this pans out. Looks like it will be a great build. |
01-22-2018, 10:57 PM | #15 |
Newbie Join Date: Oct 2016 Location: NH
Posts: 27
| 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. Last edited by Gandalf The White; 01-22-2018 at 10:59 PM. |
01-23-2018, 04:14 AM | #16 |
RCC Addict Join Date: May 2015 Location: Price Twp.
Posts: 1,291
| 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. |
01-23-2018, 04:49 AM | #17 |
Rock Crawler Join Date: May 2012 Location: Australia
Posts: 517
| Re: Crazy axles idea design Or you can see what’s been done, find the flaws and improve on it.
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01-23-2018, 05:10 AM | #18 | |
RCC Addict Join Date: May 2015 Location: Price Twp.
Posts: 1,291
| Re: Crazy axles idea design Quote:
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. | |
01-23-2018, 10:16 AM | #19 |
I wanna be Dave Join Date: Aug 2004 Location: Tri-cities, WA
Posts: 4,831
| Re: Crazy axles idea design
Just looking at the models posted it is pretty obvious the research has been done. |
01-24-2018, 05:00 AM | #20 | |
Pebble Pounder Join Date: Jan 2018 Location: Spain
Posts: 146
| 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: BC-Brian's Real life Unlimited MOW with a dash of something crazy 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: Last edited by gonper; 01-24-2018 at 05:13 AM. Reason: Tipo found | |
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