Re: [St] Chain Links

["Young, Mike" <myoung@xxxxxxxxxxx>]

If belt strength is a problem the rear sprocket can be made larger
(which reduces tension per unit torque) or the countershaft sprocket may
be made smaller (same theory) but of course you run into the ratio
issue. If I remember correctly the V-Rod uses a disproportionately large
rear sprocket, and probably for just this reason....It lets them get
away with a narrower belt.
A tensioner can be made pretty light and compact, but now we're starting
to talk about redesigning the swing arm to mount the bugger. As has been
said; having the countershaft sprocket and swing arm pivot negates the
need for a tensioner and gives the added benefit of constant
anti-jacking (squat) geometry through the swing arm's range of motion.
(Which may or may not really be a benefit, depending on the geometry of
the spring / shock linkage.)

Mike 
'06 ST
Seattle
 
 
-----Original Message-----
From: st-bounces@xxxxxxxxxxxxxxxxxxxx
[mailto:st-bounces@xxxxxxxxxxxxxxxxxxxx] On Behalf Of Neil Lindsey
Sent: Friday, July 11, 2008 12:38 PM
To: ST@xxxxxxxxxxxxxx
Subject: Re: [St] Chain Links

some sort of tensioner would almost certainly be mandatory since the
belt is 
tightest only when the centre points of the countershaft sprocket, rear 
wheel sprocket, and swinging arm pivot are in alignment

there was an early attempt to design a belt drive for the Sprint that
did 
NOT have a tensioner and, although they never came out and admitted what
the 
issue was, they found that the belt suffered catastrophic failure after
a 
relatively short amount of time -- I don't think it was related to the 
material being used for the belt either -- in any event, the project was

abandoned

any up or down movement in the suspension causes the belt (or chain) to
lose 
tension and I do not think that a belt would be very forgiving in this 
regard (due to the way the cogs engage), which is to say that wear would

increase as tension decreases

but if the tensioner was designed to take up a relatively LARGE amount
of 
slack, then I believe that it might be possible to go up or down in
sprocket 
sizes without the need to replace the belt

----- Original Message ----- 
From: "Matt Knowles" <matt@xxxxxxxxxxxxxxxxxxx>
To: <ST@xxxxxxxxxxxxxx>
Sent: Friday, July 11, 2008 12:07 PM
Subject: Re: [St] Chain Links


> No I was referring to the fact that you can't change the size of the
belt 
> by adding or taking away links, so it would make it harder to  change
the 
> pulley sizes. If there was a tensioner (more weight and  friction) you

> could go down in size, but it would rule out going  larger. Of course
if 
> you were able to swap the belt to a new size it  would be ok, but then
you 
> run into the problem that you mentioned.
>
> On Jul 11, 2008, at 11:21 AM, Neil Lindsey wrote:
>
>> are you refering to the fact that a belt is endless?
>>
>> in our case, this means that you have to pull the swinging arm to 
>> install it
>>
>> this is something you wouldn't want to do very often...
>>
>> Neil
>>
>> ----- Original Message ----- From: "Matt Knowles" 
>> <matt@xxxxxxxxxxxxxxxxxxx>
>> To: <ST@xxxxxxxxxxxxxx>
>> Sent: Friday, July 11, 2008 8:41 AM
>> Subject: Re: [St] Chain Links
>>
>>
>>>
>>> On Jul 8, 2008, at 5:24 PM, John Ulizzi wrote:
>>>
>>>> It could be if the belt wheels were made in diferent
>>>> sizes...
>>>>
>>>
>>> Just got back from 3 days of fire duty and I see everyone was  busy 
>>> typing while I was gone.
>>>
>>> I can't believe no one spotted the problem here.  Or maybe it was
just 
>>> so obvious no one felt it was necessary to comment?
>>>
>>> Matt Knowles - Ferndale, CA - http://www.knowlesville.com/matt/ 
>>> motorcycles
>>>  '99 Sprint ST - for going fast and far (2CZUSA)
>>>  '01 KLR650 (A15) - for exploring the North Coast backroads
>>>  '97 KLX300 & '01 Lakota - for playing in the dirt
>>>  '79 KZ400 - just because it was the first vehicle I ever owned
>>>
>>> _______________________________________________
>>> Triumph Sprint ST/RS mailing list
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>>
>> _______________________________________________
>> Triumph Sprint ST/RS mailing list
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>
> Matt Knowles
> Aesthetic Design & Photography - www.aestheticdesign.com - (707)
786-4643
>
>
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