2 speed transmission idea - Page 5

sawhit4 · #61 12-20-2004, 11:03 PM

the mini X uses a motor shaft that extends the length of the car. Kinda like how the xmod uses that shaft that goes the length of the bottem of the car and connects the front to the back but through the motor instead of the gear drive. Ill search the mini x forum and find the dealer website so you can order one. You could just cut it to whatever length you want.

As for pinion gears being different sizes yes their are different size pinions but i believe they differ in diameter though. If it had fewer teeth but was the same diameter then it wouldnt mesh properly.

The motor shafts and pretty small so cutting a key knotch would be pretty hard. A dremel might do it but you might try making the ring out of something like brass and soldering it on.

viperdout · #62 12-21-2004, 05:14 PM

Quote:

Originally posted by sawhit4
the mini X uses a motor shaft that extends the length of the car. Kinda like how the xmod uses that shaft that goes the length of the bottem of the car and connects the front to the back but through the motor instead of the gear drive. Ill search the mini x forum and find the dealer website so you can order one. You could just cut it to whatever length you want.

As for pinion gears being different sizes yes their are different size pinions but i believe they differ in diameter though. If it had fewer teeth but was the same diameter then it wouldnt mesh properly.

The motor shafts and pretty small so cutting a key knotch would be pretty hard. A dremel might do it but you might try making the ring out of something like brass and soldering it on.

The site here has all the parts.

ben1112 · #63 12-22-2004, 12:53 AM

Those who says a 2speed transmission is possible in an xmod are dumb b*stards. 1st, if it was possible, why doesn't radioshack do it? 2nd, why compare emaxx to xmod?(they serve different purpose. show me a onroad ep if u can) 3rd, if you were so good, u would most probably be on the design team of radioshack or some company and not discussing it here.

LAST

Prove me wrong if you can. If you insist that i'm wrong, how much time do you need to complete this project? All u guys do is say it's possible it's possible... and it dies off eventually or warps into another thing like the dual motor project.

ben1112 · #64 12-22-2004, 12:58 AM

heck, you guys dont even have cad drawings.

Capt.ArD · #65 12-22-2004, 10:22 AM

ok ben, ill give you that we're not designers for RS, but why cant we try? nobody has proved that it cannot be done.

And what was the point of your post? if we want to "waste our time" or whatever, that's our deal. what you just did is a great way to start a flame war. please dont post unless it is constructive to the topic.

jeremy_n · #66 12-22-2004, 11:49 AM

I agree with Capt. We are working here trying to improve something and also trying to be creative. Your argument about "if it will work, why doesn't RS have it?" doesn't make a whole lot of sense. Here is a small list of upgrades that RS doesn't have but do work:

1. Lithium Ion battery upgrades
2. Carbon fibre drive shafts
3. Metal lugs and shims
4. Aluminum brackets and suspension pieces
5. Carbon fibre chassis'
6. Aluminum chassis'
7. Stacked FETs
8. 130 and 180 size motors

And that's just a list off the top of my head. I know there's more but that's just without thinking about it too hard. The point you made about it not being at RS is moot. If people like us listened to people like you where would we be today? Maybe our idea won't work. So? If you don't have any constructive criticism, then don't say anything. You say that it will be like the dual motor and warp into something else. If this does work or ends up turning into another upgrade that makes your XMods faster are you going to buy it? Have you bought anything for your XMods that doesn't come from RS?

I'm not trying to start a flame war I just don't like it when people jack other people's discussions just to flame or put down their ideas. He didn't once say why it wouldn't work or even offer any thoughtful ideas. Just picture however many years ago someone said "I want to make a small car that you can control via a radio signal". I bet there was someone just like little ben here who said "You guys are dumb b*stards... it will never work and you're just wasting your time".

RacinSkillZ101 · #67 12-22-2004, 01:45 PM

you forgot some of the stuff ive done, 260 size motor, regulator, wide rims, independant rear supension, plate type lsd diffs. heck i was tellin the r.s. by my house about we nut jobs do and they were in awe, so keep shootin for the 2spd its possible just gottra think

slugbugg · #68 12-22-2004, 04:22 PM

WOW ben1112 you are narrow minded.

If people had not tried to fly, where would we be today?

Let them alone already if they want to try it so be it, it wont cost you anything and if this thread bothers you then just dont read it.(I find this thread interesting myself)

I myself think it can be done but it may take a lot of trial and error before it works but I think it can be done.I also think it can be done more than one way.

my thoughts are also that centrifical force is almost the only/easiest way to go.
I'm also thinking that it will take a completely new motor mount to house the 2 speed tranny.
my thinking is a custom tranny and motor mount that can be switched out fast if need be and will not change/mess with the stock spur gear on the center shaft.

viperdout · #69 12-22-2004, 04:28 PM

Ben, I've lost all respect for you. The fact that these guys are just TRYING something new and being creative takes some thought. The fact you come in here, rake a quick look and write "It can't be done" is straight up bs. It might not fit under a stock body, but it can be done. People thought a brushless xmod was impossible. Brickmodder and I both have brushless xmods (just gotta finish the gear and it's done).

Capt.ArD · #70 12-22-2004, 05:53 PM

thank you, guys, glad to know people are watching this and think it'll work. as i said before, i have been sitting on a new idea based on a governer for a steam engine. my mom is hiding something in the basement till chistmas

, so i can't work on it, so i'm gonna thorw it out here so ppl can help me refine the idea while i wait to be able to get to my tools.

the idea is that the metal collar is fixed to the shaft, the pinions are free to slide along the shaft, but the spring keeps them at the end. those weights spin and the centrifugal force pulls them outwards, compressing the sring and pulling the pinions toward the motor. if the pinions have different #'s of teeth, then this will act similar to the one jeremy is designing. only the pinions change, not the second gear.

the problems i have with this idea is that where the two gears meet, the teeth will not line up, and there will be problems with the sliding. also, the bevel gear probably won't allow for too much if any sliding anyway, because of the placement and general design.

give me any help you can, this version is simpler and even i can build it, so long as the design gets worked out. i really wanna get my hands dirty, not just sit and think!

jeremy_n · #71 12-22-2004, 07:23 PM

That's a great idea Capt! Very clever

I do have a problem with it though. Not saying it won't work, just something to think about. The different sized pinions would cause a problem... the teeth need to match for this type of gear to gear system. Unless there's some kind of magic ratio (who knows maybe the Fibonacci sequence?) then there would be some major gear grinding..
Also, the transfer from one pinion to another might be problematic. Although it may not, there's really no way to tell without trying.
Also, with the two different pinions, how would the smaller pinion contact the drive pinion? I'm stumped...
I think it's an amazing idea with loads of potential, it's just a little hard to figure out how to apply it successfully. Please don't think I'm trying to bash your idea, I think it's great!!
Hmmm....I'm defintely going to think on this one...
Great idea though.
Hmmm...
I think I might have an idea to elaborate on your design...
Hmmm...

slugbugg · #72 12-22-2004, 07:31 PM

Here is a interesting link.

how stuff works

viperdout · #73 12-22-2004, 07:43 PM

Now that I'm really looking at this problem, your best bet to make a gearbox would be a CVT. You'd need 2 cones and a belt and a pulley to replace the gear with. A bit motor could move the set of cones back and forth, raising and lowering the gear ratio, or you allow the pinion-mounted cone to move, then centrifical force could make them move out, making the ratio larger, and attach a spring to the arm and bevel, so as it slowed down, it'd get pulled back in. This setup would be fairly small, too, and make a fully variable tranny!

sawhit4 · #74 12-22-2004, 09:56 PM

wow people like ben should be banned. I still hold my ground in saying that this is not worth it but fully understand that yall can spend your time doing whatever you want. Oh and as for his question about if it needed a two speed why didnt radio shack put one on it? even if the car needed on radioshack wouldnt put one on it. Look at their other rc cars. Their toy level not hobby level and the xmod is kinda on the line between the two. Come on ben lets try to think things through before we open our mouths huh?

Now thats a nice idea capt. Very creative. But since one gear is smaller in diameter when the larger gear disengages the car would stop because the smaller one would not be able to engage the other gear. Get what im saying?

Capt.ArD · #75 12-22-2004, 10:07 PM

good idea viperdout, but isn't the controller 2-channel? how will you control the bit motor?

anyway, the more i think about the governor, the more i believe that ill need a super-special pinion made. this will fix ya problem sawhit
the pinion would have more teeth on one end than the other, and the odd teeth tapering out, to smooth the transition. like this.

even so, it may grind. ideas?