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tech / rec.bicycles.tech / Geared shaft drive design

SubjectAuthor
* Geared shaft drive designAMuzi
+- Re: Geared shaft drive designCatrike Rider
`* Re: Geared shaft drive designRoger Meriman
 `* Re: Geared shaft drive designfunkma...@hotmail.com
  +- Re: Geared shaft drive designAMuzi
  `- Re: Geared shaft drive designRoger Meriman

1
Geared shaft drive design

<u7jtid$25gkn$1@dont-email.me>

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From: am...@yellowjersey.org (AMuzi)
Newsgroups: rec.bicycles.tech
Subject: Geared shaft drive design
Date: Thu, 29 Jun 2023 07:31:04 -0500
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 by: AMuzi - Thu, 29 Jun 2023 12:31 UTC

https://bikerumor.com/driven-orbit-drive-gearbox-ebike-motor/
--
Andrew Muzi
<www.yellowjersey.org/>
Open every day since 1 April, 1971

Re: Geared shaft drive design

<52vq9i1cqjaekoc2i7cm54dc9oohtmljnf@4ax.com>

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From: solo...@drafting.not (Catrike Rider)
Newsgroups: rec.bicycles.tech
Subject: Re: Geared shaft drive design
Date: Thu, 29 Jun 2023 08:43:28 -0400
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 by: Catrike Rider - Thu, 29 Jun 2023 12:43 UTC

On Thu, 29 Jun 2023 07:31:04 -0500, AMuzi <am@yellowjersey.org> wrote:

>https://bikerumor.com/driven-orbit-drive-gearbox-ebike-motor/

Why bother with pedals, don't they just get in the way?

Re: Geared shaft drive design

<gsfnM.440523$HaOd.403593@fx12.ams4>

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Subject: Re: Geared shaft drive design
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From: rog...@sarlet.com (Roger Meriman)
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 by: Roger Meriman - Thu, 29 Jun 2023 13:13 UTC

AMuzi <am@yellowjersey.org> wrote:
> https://bikerumor.com/driven-orbit-drive-gearbox-ebike-motor/

Seen it about the internet, I assume the biggest market is EMTB and I do
wonder about the shaft and it’s interactions with the suspension, as it is
on an analog MTB the suspension will alter In performance depending on gear
on/off saddle and so on.

Might fit better with cargo bikes and similar? Ie rigid frames? And still
high value bikes.

Roger Merriman

Re: Geared shaft drive design

<76cc5cd9-37fa-41e6-937d-2e07ebe2c7a2n@googlegroups.com>

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Subject: Re: Geared shaft drive design
From: funkmast...@hotmail.com (funkma...@hotmail.com)
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 by: funkma...@hotmail.co - Thu, 29 Jun 2023 14:21 UTC

On Thursday, June 29, 2023 at 9:13:51 AM UTC-4, Roger Meriman wrote:
> AMuzi <a...@yellowjersey.org> wrote:
> > https://bikerumor.com/driven-orbit-drive-gearbox-ebike-motor/
> Seen it about the internet, I assume the biggest market is EMTB and I do
> wonder about the shaft and it’s interactions with the suspension, as it is
> on an analog MTB the suspension will alter In performance depending on gear
> on/off saddle and so on.

They address that:
"the drive shaft would need to grow and shrink in length to accommodate any changes in rear-center length. Likely, the chain-driven system would find its way onto such bikes before this Direct Drive option."

Seems to me as long as the suspension motion follows an arc around the bottom bracket all they would need is a U-joint.

>
> Might fit better with cargo bikes and similar? Ie rigid frames? And still
> high value bikes.
>
> Roger Merriman

Re: Geared shaft drive design

<u7khum$27nch$1@dont-email.me>

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From: am...@yellowjersey.org (AMuzi)
Newsgroups: rec.bicycles.tech
Subject: Re: Geared shaft drive design
Date: Thu, 29 Jun 2023 13:18:56 -0500
Organization: Yellow Jersey, Ltd.
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 by: AMuzi - Thu, 29 Jun 2023 18:18 UTC

On 6/29/2023 9:21 AM, funkma...@hotmail.com wrote:
> On Thursday, June 29, 2023 at 9:13:51 AM UTC-4, Roger Meriman wrote:
>> AMuzi <a...@yellowjersey.org> wrote:
>>> https://bikerumor.com/driven-orbit-drive-gearbox-ebike-motor/
>> Seen it about the internet, I assume the biggest market is EMTB and I do
>> wonder about the shaft and it’s interactions with the suspension, as it is
>> on an analog MTB the suspension will alter In performance depending on gear
>> on/off saddle and so on.
>
> They address that:
> "the drive shaft would need to grow and shrink in length to accommodate any changes in rear-center length. Likely, the chain-driven system would find its way onto such bikes before this Direct Drive option."
>
> Seems to me as long as the suspension motion follows an arc around the bottom bracket all they would need is a U-joint.
>
>>
>> Might fit better with cargo bikes and similar? Ie rigid frames? And still
>> high value bikes.
>>
>> Roger Merriman

Prior art is a sliding spline shaft section such that preset
gear lash doesn't change with changes in drive-to-hub distance.

Nothing like that was shown in the drawing but I assume
they'll adopt one as soon as they go on a test ride.

I've mentioned before that among the all-time best riding
(and snappy looking) bikes I have ever ridden was a 1913
Pope Columbia shaft drive fixed in green cromovelato. Owner
noted that gear lash adjustment was an annoying aspect of
actually riding it

--
Andrew Muzi
<www.yellowjersey.org/>
Open every day since 1 April, 1971

Re: Geared shaft drive design

<dkknM.14$5Hs.9@fx03.ams4>

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From: rog...@sarlet.com (Roger Meriman)
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 by: Roger Meriman - Thu, 29 Jun 2023 18:46 UTC

funkma...@hotmail.com <funkmasterxx@hotmail.com> wrote:
> On Thursday, June 29, 2023 at 9:13:51 AM UTC-4, Roger Meriman wrote:
>> AMuzi <a...@yellowjersey.org> wrote:
>>> https://bikerumor.com/driven-orbit-drive-gearbox-ebike-motor/
>> Seen it about the internet, I assume the biggest market is EMTB and I do
>> wonder about the shaft and it’s interactions with the suspension, as it is
>> on an analog MTB the suspension will alter In performance depending on gear
>> on/off saddle and so on.
>
> They address that:
> "the drive shaft would need to grow and shrink in length to accommodate
> any changes in rear-center length. Likely, the chain-driven system would
> find its way onto such bikes before this Direct Drive option."
>
> Seems to me as long as the suspension motion follows an arc around the
> bottom bracket all they would need is a U-joint.
>
>>
>> Might fit better with cargo bikes and similar? Ie rigid frames? And still
>> high value bikes.
>>
>> Roger Merriman
>
More how will the suspension work with it, ie will it firm up like a
Derailleur system, ie how much of what the drive chain is doing will
feedback into the suspension?

Roger Merriman

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