Higher Clearence axle gear layout

[RCCalifornia]

Hey all, Just wondering if anyone has tried this gear placement before for higher clearance? May try making an axle like this over the summer. It seems like there would be higher ground clearance. But axle gear reduction would be sacrificed and the axle would become more complicated. The ring gear would also have to be small enough so it does not just out far enough from the axle to make it hang up on rocks. Just for reference the bottom big gear would be a ring gear and would be at bottom of the axle parallel to the ground and the two smaller gears a pinion gear but unfortunately i cant do those types of gears in solid works. Ill try to make a more detailed solid works set up later.

[AlmstEvil665]

Wouldn't a worm gear type axle like the RF and Losi be a lot easier than building an axle from scratch. I'm not knocking your idea cuz it looks like it could work but why go through all the trouble when there are already HC axles out there?

[FrankyRizzo]

Because with the extra gear everything would run backwards.

[gunnar]

I think upper bearing support for the horizontal gear would be difficult for that setup. Slightly off topic, but what I would like to see would be an offset pumpkin with high pinion set up, Like some 1:1 crawlers use. Maybe a 6 tooth pinion and a 24 tooth ring gear for a smaller gear diameter. Would have to be some fairly tough steel for that tiny pinion though. Link placement might get pretty creative, but it could be done.

[JeremyH]

I'm sure that you know this, but the teeth on that horizontal gear are in the wrong spot...they would need to be on the "top" of the gear.

[RCKSQRL]

if looking for a higher clearance, axial (?) makes a portal box for their axles that woud increase clearance and is bolt on

[Krakker]

Originally Posted by RCKSQRL

if looking for a higher clearance, axial (?) makes a portal box for their axles that woud increase clearance and is bolt on

R U sure? I have never seen one, I'd like to see some proof.

[oldhippie]

New 3racing High Clearance Knuckle.

[RCKSQRL]

yup, knew I saw it here. Not from axial but for axial.....


New 3racing High Clearance Knuckle.

[chrisjlittle]

Why do you want to put the #2 gear on the bottom? If you're maximizing ground clearance, why not put the #2 gear on the top? That way you'll end up with a flat top on the axle that's easier to mount stuff on as well.

[RCCalifornia]

Thanks for the replies guys, I did think about putting the second gear at the top but it would just be a bit harder for me to make, im trying to do this with very limited tools, and to be honest its more of an experiment than anything else. The reason im choosing this over a worm gear set up is that first im hoping it is more efficient than a worm gear and second im hoping to get even more clearance than a worm gear set up. And yes I do know these gears are not the right type, its just the best i could do in solid works.

[Terranaut]

Whatever arrangement you end up with, I would suggest you do not compromise on reduction ratio. Torque twist is challenging enough as it is!

Cheers.

[microgoat]

Maybe I'm just fawking dense, but I don't see the extra clearance. You've made the pumpkin a hell of a lot wider, but the input/output gears are still at 90 degrees, and your ring gear would still need to be large to achieve any reduction.

Try this instead:

Pinion (input) gear mounted high up to a small ring gear. This ring gear is a compound gear with maybe 10-12 teeth on its output side. The compound gear turns a small spur gear which turns the axles.

Plug in some numbers: 12t pinion, 16t compound (crown side)= 1.5:1
10t compound (output side), 24t spur= 2.4:1

Overall reduction of 3.6:1 and the small spur gear would give clearance equal to worm axles but without the heat/binding issues.

Forgive my half-ass CAD. Ideas are more powerful than tools.

[chrisjlittle]

Originally Posted by microgoat

Maybe I'm just fawking dense, but I don't see the extra clearance. You've made the pumpkin a hell of a lot wider, but the input/output gears are still at 90 degrees, and your ring gear would still need to be large to achieve any reduction.

Try this instead:

Pinion (input) gear mounted high up to a small ring gear. This ring gear is a compound gear with maybe 10-12 teeth on its output side. The compound gear turns a small spur gear which turns the axles.

Plug in some numbers: 12t pinion, 16t compound (crown side)= 1.5:1
10t compound (output side), 24t spur= 2.4:1

Overall reduction of 3.6:1 and the small spur gear would give clearance equal to worm axles but without the heat/binding issues.

Forgive my half-ass CAD. Ideas are more powerful than tools.

Like a TXT axle?

[microgoat]

Very much like a TXT axle, but with a smaller pumpkin. TXT's are only 2:1

[RCCalifornia]

Originally Posted by microgoat

Maybe I'm just fawking dense, but I don't see the extra clearance. You've made the pumpkin a hell of a lot wider, but the input/output gears are still at 90 degrees, and your ring gear would still need to be large to achieve any reduction.

Try this instead:

Pinion (input) gear mounted high up to a small ring gear. This ring gear is a compound gear with maybe 10-12 teeth on its output side. The compound gear turns a small spur gear which turns the axles.

Plug in some numbers: 12t pinion, 16t compound (crown side)= 1.5:1
10t compound (output side), 24t spur= 2.4:1

Overall reduction of 3.6:1 and the small spur gear would give clearance equal to worm axles but without the heat/binding issues.

Forgive my half-ass CAD. Ideas are more powerful than tools.

My thought process was that the vertical gear would not have to be that large giving higher ground clearance especially if the set up that I showed was flipped 180 degrees. The axial axle is around the reduction ration of 3:1 I was talking to a gear maker who could make a 22t pinion gear with a size a bit bigger than a axial pinion gear. And with the gearing set up below i could get a ratio of around 2.2:1 i think. Although your idea does look like it would be easier to make

[microgoat]

A 22t crown gear like you're using will have a larger OD than a 22t spur like I proposed, for a given pitch. And your pumpkin is still going to be hella wide.

Also, your counter gear can be much smaller. It's just an idler so its ratio is unimportant.

[RCCalifornia]

Originally Posted by microgoat

A 22t crown gear like you're using will have a larger OD than a 22t spur like I proposed, for a given pitch. And your pumpkin is still going to be hella wide.

Also, your counter gear can be much smaller. It's just an idler so its ratio is unimportant.

Ya i realized i could use a 10 tooth idler gear and make it even smaller Also I may be misunderstanding something but how could a ring gear turn a spur gear? Would it be a ring gear on a shaft with a regular pinion gear attached?

[RCCalifornia]

Well ive been thinking and Ive come up with a hopefully easy/ cheap way to make an axle that it is a modification of micro goats idea. Im going to start drawing it up as best as a I can in CAD tonight. Btw anyone know of an easy way to make ring gears in solid works?

[microgoat]

Originally Posted by RCCalifornia

Ya i realized i could use a 10 tooth idler gear and make it even smaller Also I may be misunderstanding something but how could a ring gear turn a spur gear? Would it be a ring gear on a shaft with a regular pinion gear attached?

A compound gear is basically two gears in one, like the laygear in a manual transmission or most of the gears in a servo. There's no reason you couldn't make one by locking two gears to a common shaft.