planetary gearboxes?

[athlon]

Hello everyone,

with a friend I'm trying to build some kind of electric buggy dunes using 4 etek engines

(http://www.electricmotorsport.com/store/ems_ev_parts_motors_etek.php )

But there's a need for a reduction of about 1:8 and first impulse I thought I'd do it with a lazy-corona-catena, but it'd be bulky and so looking for a more compact solution I'm encapsulated in plane gearboxes though I couldn't figure out if it's a solution that could work in my case.


I had bowed the piece rr105uc that in theory would do just in my case http://www.reggianariduttori.com/ita/02/prod01c.htmBut I have a few questions.

When these gearboxes cost, I'm sure more than a chain lap and some bearings, but we're in the order of 500 euros, 1000 or 10000 ... I've also searched on google but I can't find any list and no e-commece selling them.


The diameter of the wheels of the buggy is about 60cm and from the tables it seems that at that distance the maximum load is 30 kg but surely I have wrong the calculations...
(if the buggy jumps and lands crooked there are about 800kg landing at 60 cm away from the axis ... I would not find myself with a wheel that detaches)

data is in this pdf http://www.reggianariduttori.com/pdf/c200.pdf- last but: eek: important: can the engine be attached to the gearbox?

 

[gerod]

Bye.
we are on the fundamentals of mechanics! ! !
planetary gearboxes (epicicloidali) are very compact, can achieve high precision, high pairs and many other characteristics (see here: http://it.wikipedia.org/wiki/ingranaggio).
Obviously they cost much more than a traditional reducer.
1. How much do they cost? depends on the size. What do you send?? What speed do you need to get?
2. there are gearboxes that hold the wheel, they are made on purpose (see gearboxes for tracks, for trams, etc.). for dynamic loads you have to tell what the limit is and consequently find the suitable gearbox.
3. the engine is usually coupled to the reducer. But why do you want to attack him? How many engines do you need?

 

[athlon]

:biggrin::biggrin: how I know .. I built them with the lego by changing pieces .. what I miss is the contact with the real world.


1) to the eye I was interested in the rr105uc that is about 20cmx20cmx20cm as size , the motor makes about 20.5nm torque , as maximum velocity I thought about 80-90 km/h no more ' because then it begins to be dangerous by a craft medium

2) I tried to make calculations but nothing comes back to me, for example the rr105uc from the calculations I made should break with about 30kg load on the edge of the wheel (wheel radius 60cm), considering that the machine would weigh 800 there is something that does not return to me

3)4 engines, each attached directly to the wheel so I have 4x4 without making transmissions and differentials.

 

[athlon]

attach the buggy rear suspension project, the blue piece would be the gear + motor, the green and gray diagonal elements represent a motocross fork

the front suspension would be identical with the difference that the motor (blue) can rotate compared to the grey plate immediately below

 

[stefanobruno]

alego the back suspension project of the buggy, the blue piece would be the gear + motor, the elements diagonally green and gray represent a motocross fork

the front suspension would be identical with the difference that the motor (blue) can rotate compared to the grey plate immediately below

4motors+4reducers+4forcellemotocross=5000euri.
then you still have to buy a steering wheel, a seat a tot of batteries, 300kg tubes, discs and brake pads, etc., project and hand of work...
I think it costs less than a Polish 500abarth.

Bye.

 

[cacciatorino]

attach the buggy rear suspension project, the blue piece would be the gear + motor, the green and gray diagonal elements represent a motocross fork

the front suspension would be identical with the difference that the motor (blue) can rotate compared to the grey plate immediately below

considers that, especially on an off-road vehicle, to put large masses in correspondence of the wheel (i.e. the so-called "non-sustained masses") is very detrimental to the good functioning of the suspension due to the high inertia. Consider that on wheels you often use magnesium rims to save as much weight as possible, this to make you understand the importance of the thing. You would otherwise need shock absorbers with a strong braking effect so with an intrinsically slow dynamic, and the wheel would also have difficulty following the undulation of the ground, resulting in loss of grip. better put gear motor on board machine and then drift the bike to the wheels through a central shaft.

 

[Mario SJPD]

masses not suspended? ?
I found this:

suspended masses (sprung mass)
definition: with the term sprung mass it is defined all that mass that is suspended from the suspension springs. that is to say the frame that in turn supports the motor, change, various fluids, body shop, occupants of the medium etc. in fact the English word is as usual lighter as it literally sprung mass is translated into soft mass.

masses not suspended (unsprung mass)
definition: unsprung mass (not softened) instead is the term that defines all that remains below the spring. i.e. wheels with tires, brakes with pliers, hub etc.

 

[sampom]

attach the buggy rear suspension project, the blue piece would be the gear + motor, the green and gray diagonal elements represent a motocross fork

the front suspension would be identical with the difference that the motor (blue) can rotate compared to the grey plate immediately below

I'm sure you're dreaming at night, huh?
:biggrin:
Now I don't have time, but among other things I'd tell you to discard the motorcycle forks immediately.

greetings and good year
Marco:smile:

 

[athlon]

I'm sure you're dreaming at night, huh?

Now I don't have time, but among other things I'd tell you to discard the motorcycle forks immediately.
greetings and good year
Mar

:frown: and to think that the only thing I've already got is the motorcycle fork deck, by the way, I thought I'd use them just because I already know how to squeeze on it and I have a lot of wandering pieces (molles, tampons, petals, oils) with which to experiment


p.s. Everything was born from this video... http://www.youtube.com/watch?v=mpt2ypkfvfoamong other things I would use just 4 front wheels of swamp buggy for my project since they do not cost too much (for those who spoke of unsold masses it is better not to tell you how those wheels are made:biggrin::biggrin: )

 

[athlon]

another advantage of using 4 "almost motor hubs" is that by connecting them in parallel you get a great surrogate of differential with limited slip.

with the connection in parallel when a motor has more 'grip' than the others can exploit more current because the resistance of a stalled motor or otherwise under stress is less than that of a motor that turns without load.

If I had to look for 3 limited slip differentials (torsen style) I wouldn't know exactly where to look for them and maybe even economically the motorion solution + reduced + 3 differentials + trees and joints I think it will cost more than 4 scooters + 4 gearboxes

 

[sampom]

p.s. Everything was born from this video... http://www.youtube.com/watch?v=mpt2ypkfvfo

But where did you see her forks?
but rather you put monoammortizers, if you want to do serious things with "quadrilaterals", otherwise even that simple triangular.
then you can decide whether to make them "progressive" with leverage or not (with a pds you remove the problem of joints).

greetings
Mar