Cush drive unit

[Yoshi]

Yes, but it looks like that doesn't use bearings.
It looks like the driver rides on the inside of the hub.
Seems like it would wear out, but I could be wrong. Who makes it?

I don't know who makes it, found that pics years ago.  I've been working on a new cush drive myself for a while and it's more similar to the pic I posted. I thought about the 2 chain idea because one of the new powerplant designs i'm working on will exceed a single chain's capability.

[Rick S.]

I think the 2 chain idea is great. I've seen that pic posted somewhere before too.
I really like the cnc housing. I'd go that route, but I'm trying to keep it simple.
With more power I think you would definitely want to run it on bearings though.
The pic looks like everything just fits tight and relies on the fit to hold the radial and axial location. Once it wears out it's shot. It needs to be rebuildable.

[Yoshi]

I think the 2 chain idea is great. I've seen that pic posted somewhere before too.
I really like the cnc housing. I'd go that route, but I'm trying to keep it simple.
With more power I think you would definitely want to run it on bearings though.
The pic looks like everything just fits tight and relies on the fit to hold the radial and axial location. Once it wears out it's shot. It needs to be rebuildable.

Agreed, it does have some potential issues which I've already worked out in my design.....

[Nutz4sand]

Anybody simply took a look at a motorcycles rear hub?

With it you already have the sprocket mount. Just use the part the sprocket mounts to and the rubber insert they use for cushion. These have got to be pretty cheap with all the wrecked superbikes out there.

Then machine your own inner part that matches the stock wheel hubs dimensions for the cushdrive to fit on and fits to your shaft you are putting it on. All you have to do is mimic the biks inner hub.

This could be used right on the rear axle OR feeding into a gearbox easily.

[Engineer]

With the use of the laser/waterjet parts, Rick's design will be pretty inexpensive.  Of course the flanges will have to be machined.


Wasn't trying to suggest you didn't have it figured out Rick, but until I figured out where you were headed, it seemed open to ideas. 


Now I am glad I haven't started my build log yet.....  Cause until I can show the solution to all of the problems, it will be a barrage of comments, and "helpfull" tips. LOL


Good design, are you going to use it on your new Piranha?


Where do you plan to hang the brake rotor?

[fabr]

LOL!!! NOW you see why I don't.LOL

[Engineer]

LOL!!! NOW you see why I don't.LOL

ROFL........   Your a perty smart ol guy!!! 

[fabr]

ol and crafty at times also!

[Boostinjdm]

Sorry Rick, when I see people making real parts I get excited and a little carried away.  It's always nice to see somebody following through on an idea.  I'll try to get my ideas posted in my own thread and you guys are welcome to jump all over them.

[Rick S.]

No need to apologize, I figured it would generate a good discussion.
And I do want to hear other ideas. I just sold an RC51 cush drive. Maybe one of those could be adapted, but it wasn't giving me any ideas. I think the best designs are done with specific intent. 
All I really have worked out is this main axle. It will be sealed and enclosed, I have a pretty good idea how I want to do the jackshaft portion. That's where the rotor will go.
It's not for my Piranha. It's just something I've been thinking about. Now I've decided to give it a try. It won't be done soon. I will make the rest of the axle and the flanges, then it may sit awhile. I really need to get the Piranha done.

[Boostinjdm]

ok quick question cuz I can't seem to get a direct answer elsewhere.  Will a double sealed bearing be enough to keep oil contained in a sealed unit or is a shaft type seal necessary?

[Rick S.]

I've wondered that myself. It might. Probably depends on what type of seals the bearing has.
Contact type?  If it's got double seals you'd think it would work.

[fabr]

ok quick question cuz I can't seem to get a direct answer elsewhere.  Will a double sealed bearing be enough to keep oil contained in a sealed unit or is a shaft type seal necessary?

Nope it won't .Bearing seals will keep grease in a bearing od moderate rpm but not oil. You need an actual seal.

[BDKW1]

Who makes it?

Winters engineering, it's a cush drive for a full floater rear end. The also make spools with a similar set-up.

http://www.wintersperformance.com/catalogs/2005WintersPerformance/0601024.htm

http://www.wintersperformance.com/catalogs/2005WintersPerformance/0241024.htm

[Admin]

That actually bolts at the wheel hub then correct? reason for not needing bearings...