Custom rear hub

[Miles]

If you could have a custom rear hub made to suit your needs. What configuration, dimensions and features would it have?

- Over locknuts dimension (OLD)?
- Number of spoke holes?
- Disk brake?
- LH freewheel?
- Cassette driver for x no. sprockets?
etc. etc.

 

[gensem]

humm... large magnets, maximum possible torque, around 0.7-1km/h per volt. Built to handle 4kw+ continuosly. Rear mounting, standard 135mm

 

[Miles]

This the non-hub motor section :wink: A hub is a hub, not a frock.

 

[gensem]

This the non-hub motor section :wink: A hub is a hub, not a frock.

LoL... thats true... but I always think of a frock when I see the word hub writen in ES.

 

[Thud]

Hmmnnnn,
Did you have spys looking over my shoulder last night Miles ?

I was sketching modular rear hubs playing with several iterations.....After all is said & done, Idealy, I keep coming back to leaving the right side alone with a 9 speed cassett for full pedaling options & making a modular left side to acomidate E-drive & disc brakes.
I have stated before I really like the freewheeling on the rear most drive section. Near total disconnection when its time to pedal. & I really don't want to sacrifice my rear discs....such easy maintance & they don't care of your wheel gets a kink in it.

I am really evolving toward a super light weight set up as the goal. Other than the weight penalty I want all the functionality of a pedal bike. I bought a few e-bay cassetts to chop & make my 3 speed freewheels over freehubs.
For practicality, a design specific hub is the logical step.

sounds like your getting ready to fire up Alibre & give us some renderd teasers & a challenge to machine them? :lol:

 

[Miles]

My spies are everywhere.....

I've been pondering whether a 9-speed cassette is really necessary? A shorter driver on the RH side would allow the LH flange to be brought in, creating more room on the LH side and a more symmetric wheel build.....

I guess the first decision is motor drive on the righthand side or the left, though.......?

 

[Dingo2024]

this may have been brought up on here before in another thread, but this looks like a good (better?) starting point

http://profileracing.com/profileracing/estore/product.php?productId=52&categoryId=8

Ian

 

[Miles]

That's what I was thinking, Ian. 5 or 6 speed cassette with 9-speed spacing.

 

[Miles]

For a modular system to satisfy every configuration, one could start with a fixed hub with a splined driver on both sides. The disk mount would be a separate unit that fits onto the LH driver.

 

[Dingo2024]

you could then run cogs like this? on that hub

http://www.ebay.co.uk/itm/GUSSET-DOUBLE-SIX-CNCd-single-speed-cog-16t-/370518910676?pt=UK_sportsleisure_cycling_bikeparts_SR&hash=item5644a5e6d4

which I would think would be a solution for the power hungy ES crowd :wink:

Ian

 

[Thud]

I like 135mm for triangulation.
36 holes for strength without going crazy with a zillion spokes.

here is one sketch for capturing a 35mm csk on the left. I didn't draw the bolts or sprocket adapter.

5-3mm screws go thru the clutch hub & secure the unit on the left...iso disc bolts spacing on the outer bolt circle. bearings caried in the hub to the outermost point on the axel.

comments?

 

[Miles]

Looking good.

Extend the keyway onto the main body of the hub, perhaps?
Why have the LH mount as a separate unit?


CSK35

Advantages:
Cheap (well, the Chinese ones...)
Quiet

Disadvantages:
Heavy
More difficult to fix an adaptor too?*

*You can use one with an external keyway, bond on, or use a compression screw arrangement (like the go-kart adaptors).

 

[Thud]

Why have the LH mount as a separate unit?

I was thinking harder materials for durability & less mass for additional machine set ups....

definatly adds weight.
the csk 40 has a much more favorable tourque capacity but is 80mm OD..(larger than the spoke flanges on that sketch)

I would go for a press fit for the sprocket adapter to the csk & a slip on the keyed hub.

 

[liveforphysics]

My dream hub has a left side freewheel mounted with a flange that mates to karting sprockets. It has a disk brake mounting flange. It has a single speed pedal chain sprocket, or the ability to run a small multi-gang cassette.

Most of all, my dream hub is strong enough that after building a wheel with it, I don't have to think about it or worry about it breaking apart. Large generous diameter spoke flange, possibily steel, and a nice big through-axle bolt-in hub rather than a silly quick release squwere. The pedal freewheel could be made of Chinese butter, but the left side freewheel need to be the absolute strongest options available to do the job.

 

[Miles]

Design a new heavy-duty freewheel - with spline mount, so that it could be used on the LH side or the RH side?

 

[liveforphysics]

Design a new heavy-duty freewheel - with spline mount, so that it could be used on the LH side or the RH side?

That sounds extremely attractive!

 

[Miles]

Do we need to stick to the 9-spline pseudo-standard?

 

[dontsendbubbamail]

I like 135mm for triangulation.
36 holes for strength without going crazy with a zillion spokes.

here is one sketch for capturing a 35mm csk on the left. I didn't draw the bolts or sprocket adapter.

5-3mm screws go thru the clutch hub & secure the unit on the left...iso disc bolts spacing on the outer bolt circle. bearings caried in the hub to the outermost point on the axel.

comments?

My vote is for this design. Having 9 speed compatible cogs for the rh drive is a must have. I could live with a 6 speed, if the flange spacing needs to be moved, but prefer 9 speeds. Santana has done a lot of hub research and moving the flanges out makes a lot of difference in wheel strength. They have a 16 spoke tandem wheel. My preference would be to keep normal flange spacing and have 36 spokes. A disk brake and an adapter for BCD 130 mm chain wheels would make it perfect.

Bubba

 

[Miles]

How about having a modular system with everything fixed to the 9-spline mount, which runs right through the hub?

 

[dontsendbubbamail]

How about having a modular system with everything fixed to the 9-spline mount, which runs right through the hub?

I don't understand what you are describing, but I am game for any design that gets me what I described in my earlier post. I am just afraid that if the design departs too far from standard bicycle parts its will become too expensive.

Bubba

 

[Thud]

that sounds like justification for a single pass internal broach Miles

A live male splined shaft would require a freewheeling cogset again. Or do you have that addressed already Miles?

 

[Miles]

I don't understand what you are describing, but I am game for any design that gets me what I described in my earlier post.

I'm suggesting a fixed hub with separate freewheels. So, 9-speed cassettes are out, with this.

 

[Miles]

We have a basic freewheel unit which we can use for adaptors or cogs.

 

[Miles]

Reducing the size of the spline mount would be advantageous....

 

[Miles]

If we used the present diameter 9-spline, it could also be threaded, as on the SA S3X.