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Old 01-13-2018, 05:35 AM   #1
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Default 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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Old 01-13-2018, 05:41 AM   #2
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Default Re: Crazy axles idea design

Sound like motor on wheel system ?
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Old 01-13-2018, 05:58 AM   #3
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Default 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
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Old 01-15-2018, 06:16 PM   #4
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Default Re: Crazy axles idea design

Quote:
Sound like motor on wheel system ?
Yes, that is right Teng MOW system.

Quote:
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..
Thank you Bc-brian, I seen your rig, it is great, it was quite inspirational for this idea. Actually after seeing/reading you post I decided to go brushed way instead of brushless.
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Old 01-15-2018, 06:36 PM   #5
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Default 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.

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Old 01-17-2018, 07:14 PM   #6
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Default 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.


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Old 01-17-2018, 07:26 PM   #7
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Default 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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Old 01-18-2018, 06:46 AM   #8
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Default Re: Crazy axles idea design

Quote:
What size wheel are you using to be able to fit a 380 motor and gear box inside like that?
Wheel rim diameter is 152.8mm (around 6") and tire diameter 205mm (around 8")
Moreless the same wheels sizes as other Superclass that are around.
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Old 01-22-2018, 07:23 AM   #9
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Default 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)

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Old 01-22-2018, 09:23 AM   #10
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Default Re: Crazy axles idea design

Its already been done. You might want to do some reaearch.
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Old 01-22-2018, 12:11 PM   #11
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Default Re: Crazy axles idea design

Quote:
Originally Posted by Ditchrat View Post
Its already been done. You might want to do some reaearch.
Everything has been done but there is always room for someone else to try something similar.
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Old 01-22-2018, 08:38 PM   #12
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Default Re: Crazy axles idea design

Keep up the good work, always to see cool stuff that continues to innovative.
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Old 01-22-2018, 09:57 PM   #13
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Default Re: Crazy axles idea design

Quote:
Originally Posted by Ditchrat View Post
Its already been done. You might want to do some reaearch.
Say that again when this dude hands you you're hiney on a platter at worlds and says.... Would you like some tapas and sangria to compliment your ass.


Good work.
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Old 01-22-2018, 10:21 PM   #14
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Default Re: Crazy axles idea design

I can’t wait to see how this pans out.

Looks like it will be a great build.
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Old 01-22-2018, 10:57 PM   #15
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Default 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.
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Last edited by Gandalf The White; 01-22-2018 at 10:59 PM.
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Old 01-23-2018, 04:14 AM   #16
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Default 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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Old 01-23-2018, 04:49 AM   #17
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Default Re: Crazy axles idea design

Quote:
Originally Posted by Ditchrat View Post
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.
Or you can see what’s been done, find the flaws and improve on it.
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Old 01-23-2018, 05:10 AM   #18
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Default Re: Crazy axles idea design

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Originally Posted by filotr14lsdude View Post
Or you can see what’s been done, find the flaws and improve on it.
Yeah exactly why you should do your research.

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.
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Old 01-23-2018, 10:16 AM   #19
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Default Re: Crazy axles idea design

Just looking at the models posted it is pretty obvious the research has been done.
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Old 01-24-2018, 05:00 AM   #20
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Default 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:
What kind of gear reduction you getting out of that worm drive, somewhere around 30:1?
Yes that is right 30:1 (https://shop.framo-morat.com/en/Worm...r-distance-25/)
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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