AR60 Pinion Bushings vs Bearings vs Bushings Thread

[Calderwood]

Originally Posted by Dostradamas

So you agree pinion angle is the main culprit?

An aggressive pinion angle doesn't help but the main issue is the thrust load from the pinion and ring gear trying to leave each other as torque is applied.

[Dostradamas]

Ah I see what you mean. The center is trying to push out & the balls get deformed quickly.
Axle housing design.

[Cableman]

How about a spacer inbetween the inner and outer bearing to help push the force onto both bearings. I forgot whats inbetween and if it could even fit though!

Scratch that, the outer bearing would need to be retained from pushing out of the housing

[frdtrkguy]

Too bad they don't make tapered roller bearings that small. They would handle the thrust load better than a ball bearing.

Almost:

http://www.ntn.co.jp/english/news/ne...s20061219.html

$$:

http://www.vxb.com/page/bearings/PROD/Kit7405

[Calderwood]

Originally Posted by frdtrkguy

Too bad they don't make tapered roller bearings that small. They would handle the thrust load better than a ball bearing.

Almost:

http://www.ntn.co.jp/english/news/ne...s20061219.html

I have spent more than a couple minutes looking for a tapered bearing that could be used. If the pinion shaft and snout were longer we could run a ball thrust bearing between the pinion gear and the inner bearing.

[frdtrkguy]

Originally Posted by nigels_world

I have spent more than a couple minutes looking for a tapered bearing that could be used. If the pinion shaft and snout were longer we could run a ball thrust bearing between the pinion gear and the inner bearing.

That would be a good project for a vendor. They could take axial HD gear sets and turn 4.5mm of the pinion shaft shoulder down to 5mm and sell the kit with the trust bearing.

Using this bearing: 2 Thrust Bearing 5x11x4.5 Grooved Washers Miniature Thrust Bearings: VXB.com Ball Bearings

If it would fit, I think it would definitely fix the problem since the inner thrust bearing washer would be pushing against the outer race of the inner pinion bearing.

Hell, I may try it myself..

[Calderwood]

Originally Posted by frdtrkguy

That would be a good project for a vendor. They could take axial HD gear sets and turn 4.5mm of the pinion shaft shoulder down to 5mm and sell the kit with the trust bearing.

Using this bearing: 2 Thrust Bearing 5x11x4.5 Grooved Washers Miniature Thrust Bearings: VXB.com Ball Bearings

If it would fit, I think it would definitely fix the problem since the inner thrust bearing washer would be pushing against the outer race of the inner pinion bearing.

Hell, I may try it myself..

You're picking up what I'm putting down. I have the stuff to do it but I have to many irons in the fire right now.

[JeremyH]

McMaster sells almost what you guys need:
McMaster-Carr
5x12x4

Boca also has some:
http://www.bocabearings.com/bearing-...hrust-bearings
http://www.bocabearings.com/bearing-...el-ball-series

And Avid has some that are WAY cheaper:
http://avidrc.com/product/13/thrust-bearings/

[ROWDY RACING]

Originally Posted by JeremyH

McMaster sells almost what you guys need:
McMaster-Carr
5x12x4

Boca also has some:
Thrust Bearings
Thrust Bearings Chrome Steel Ball Series

And Avid has some that are WAY cheaper:
Avid RC Bearings and Accessories for radio controlled vehicles, your one stop shop for RC bearings, RC wheels, RC accessories, RC springs, and much more.

The Bocas say "Thrust bearings are designed for side or axial loads" says for Axial.

Hopefully these can help the "select few" with issues.

[JeremyH]

[Calderwood]

Jeremy, those are what we were talking about when we were saying you would need to mod the pinion. You can't just replace one of the existing bearings since the thrust bearings you linked to cant handle side loads. That's where the taper bearings come in. They can be loaded from either direction.

[JeremyH]

There are two bearings around that pinion. I put the thrust bearing on the gear side with the load piece closest to the gears. I left the outer bearing the same. This should have both axial and side loads covered. However, I guess we'll never know.....as I'm not an "select few" builder......

[frdtrkguy]

Did ya turn down the od to make room for the thrust bearing? And it clears the ring gear?

[ROWDY RACING]

Originally Posted by JeremyH

There are two bearings around that pinion. I put the thrust bearing on the gear side with the load piece closest to the gears. I left the outer bearing the same. This should have both axial and side loads covered. However, I guess we'll never know.....as I'm not an "select few" builder......

You gots no big powa street cred brah!

[JeremyH]

I turned down nothing. It clears the ring gear just fine. The dimensions of this bearing are the same as the stock bearing except it is 0.5mm thicker, which was just fine as my pinion had some play in it anyway.......key word, "had".

More info:
Jeremy's RCC Giveaway Wraith Kit Build

[Calderwood]

Originally Posted by JeremyH

There are two bearings around that pinion. I put the thrust bearing on the gear side with the load piece closest to the gears. I left the outer bearing the same. This should have both axial and side loads covered. However, I guess we'll never know.....as I'm not an "select few" builder......

I don't think that a single bearing is going to handle the side loads.

Originally Posted by frdtrkguy

Did ya turn down the od to make room for the thrust bearing? And it clears the ring gear?

He only has the outer stock bearing.

[frdtrkguy]

Oh, I see. My idea was to use both of the stock pinion bearings and the thrust bearing. I'm interested to see how it holds up

[JeremyH]

Originally Posted by nigels_world

I don't think that a single bearing is going to handle the side loads.

I guess we'll never know....

[Calderwood]

Originally Posted by JeremyH

I guess we'll never know....

Why? Reading your thread it sounds like you plan to run it like this.

[JeremyH]

Originally Posted by frdtrkguy

Oh, I see. My idea was to use both of the stock pinion bearings and the thrust bearing. I'm interested to see how it holds up

I am not so sure that would work. Even if you removed that shoulder on the pinion, the outer race (on the housing) is not deep enough for both to fit.