2 speed transmission idea - Page 3

Billiam_Returns · #31 12-11-2004, 04:03 PM

and how would you do that? You'd need 2 ESCs not to mention a custom made circuit That weight would probably just make it the same speed as a stock xmod

viperdout · #32 12-11-2004, 04:52 PM

Quote:

Originally posted by Billiam_Returns
and how would you do that? You'd need 2 ESCs not to mention a custom made circuit That weight would probably just make it the same speed as a stock xmod

That was the problem.

sawhit4 · #33 12-12-2004, 12:29 AM

just about anything you make that actually works would weight to much and just slow it down.

rs2000 · #34 12-12-2004, 05:33 AM

Hmm, ok, so what is that setup used in? You should build a mini e-maxx! :chuckles:

Billiam_Returns · #35 12-12-2004, 03:04 PM

Quote:

Originally posted by sawhit4
just about anything you make that actually works would weight to much and just slow it down.

yes, but this mod would slow it down so much it would be the same speed as stock

jon.jon · #36 12-13-2004, 03:20 AM

Its funny to say this setup will probably slow the car down obviously yall dont know the power of these little motors just one by itself can do the job they possess the same ability as a brushless motor .I might have to add more weight to keep the tires on the ground, so weight is the least of my worries haha

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sawhit4 · #37 12-13-2004, 07:04 PM

i think you are being way to ambitious. I mean hey theres nothing we can do to stop you from screwing up your xmod and wasting your time on whatever you want but if you stop to think about it IF you can actually get a two speed in a car this small (and thats a very big if) it wont help it anyway.

The only way it would help is if you, for some reason, wanted to start your car off slow and then gradually get faster. Because electric motors have all their torque and speed at 0 rpms and since the have no power curve all you would be doing is slowing it down. And as for the emaxx having one it is much much larger than an xmod and has much more powerful motors that need a two speed to keep the tires from spinning.

Also another thing that contributes to tires spinning on the emaxx is that they are pneumatic. The tire can flex and twist on the rim. With an xmod the tire is a round piece of rubber on a plastic rim with no space between. Getting a tire like this to spin would require a pretty large around of force unless of course you were on a surface that its not designed for (sand, loose dirt, stuff like that)

and i agree that two of those motors on a car that small given the right power supply would probably give some pretty nice speed but now since they are higher up it will raise the COG and arent you planning to only run one at once? like a slower one first then switch to the second one?

jon.jon · #38 12-13-2004, 07:33 PM

hahahaha Ive already achieved what I wanted to do dual motor xmod ,now a 2-speed trans is possible just because you dont have the know-hows doesnt mean no one else does. oh yeah these are the wheels Im using.

I will be running both motor at the same time.

The purpose of a 2-speed trans will be low gear and high gear the 1 gear will be for when you need high torque for climbing and 2 gear is for top end speed .how can you say 2-speed wouldnt serve no purpose?

Bleek · #39 12-14-2004, 03:08 AM

wow those people saying a 2-speed tranny wouldn't work on these electric motor because they produce max tourque at 0 rpms are very wrong. Unfortunately you are forgetting one thing, the two speed tranny would change the gear ratios not the tuorque of the motor. If you think about it the gears are the difference from the drift to the top speed motor. Therefore if you start out with the torque of the white gear and can switch to the top speed gear you have a successful 2-speed tranny that would work with the "electric motor with max torque at 0 rpms"

And you still disagree with me go read up on a little thing called mechanical advatage.......

"You can't argue with science!"

Capt.ArD · #40 12-15-2004, 04:16 PM

i agree. the low gear gives the car acceleration, the top gear would take over when the lower can't make the car go any faster. so the car in low gear takes off the line like a shot, then the high gear gets it to top speed. it's like bits or zz's those crazy 4:1 ratios can hardly move the car, even at near 0 rpms, but give it a push and the car will eventually get to some insane speeds.

this mod would definately help, but only if the gear ratio you want to use is so high that the car can't move itself from stop.

RacinSkillZ101 · #41 12-15-2004, 10:28 PM

Quote:

Originally posted by Bleek
wow those people saying a 2-speed tranny wouldn't work on these electric motor because they produce max tourque at 0 rpms are very wrong. Unfortunately you are forgetting one thing, the two speed tranny would change the gear ratios not the tuorque of the motor. If you think about it the gears are the difference from the drift to the top speed motor. Therefore if you start out with the torque of the white gear and can switch to the top speed gear you have a successful 2-speed tranny that would work with the "electric motor with max torque at 0 rpms"

And you still disagree with me go read up on a little thing called mechanical advatage.......

"You can't argue with science!"

THANK YOU!!! some1 atleast gets my idea cept i would prolly do the white gear and a custom 2:1 ratio for more speed just cause the car would be already moving when the 2:1 is ingaged

Bleek · #42 12-15-2004, 11:04 PM

i have a concept idea for how it could work but i need more minds to help me work on the concept design. i got ideas that need refining and criticizm. anyone interested hit me back.

Murcielago659 · #43 12-16-2004, 01:51 AM

What you need to do is make the damn thing and show us. The reason I am against this is that it would be very expensive, and the cost would negate any performace gains. If you can do it, and do it cheaply, then more power to ya. But I don't think it's possible.

Capt.ArD · #44 12-16-2004, 10:07 AM

yeah, bleak
ill be interested in hearing your idea, tho i wont be able to do any work till after christmas. ill try coming up with some ideas myself, too. i think that a centrifugal force tranny would work best, for the size.

Capt.ArD · #45 12-16-2004, 11:27 AM

idea: the first pinion drives first gear, duh
the same driveshaft has 3-4 little springs with a little weight on the ends (4 black deals on the pic.) that move out ward as the motor revs up.
the 4 weights engage the teeth on the outer pinion, which turns the secondary gear.

i dunno if this is a good idea, but if somebody has a mill or machine shop, they can probably make one. getting it small would be the trick.

just another thought to put in the arena is a torque converter, like for an automatic transmission... not sure it could actually be used for anything, but it would be pretty easy to make.