Belt drive issues
Grand HDF Member
Joined: Dec 2007
Posts: 4,999
Likes: 55
From: Bay Area
RE: Belt drive issues
Your saying it just snapped like it was cut? Thats a torque failure, probably to being too tight and a harsh torque applied as in a downshift possibly. Without seeing the wear pattern of the belt, if there were alignment issues there would be a pattern of abnormal wear. It would have to be pretty far out of alignment to be a concern as the belt will float on the front pulley.
Have any more info? That really sux, I feel for you. Thats a lot of work to replace a belt.
Have any more info? That really sux, I feel for you. Thats a lot of work to replace a belt.
Thread Starter
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Intermediate
Joined: Aug 2008
Posts: 38
Likes: 0
From: Illinois/Indiana
Both times I was by myself no load downshifting and easy on it it seem to have a hard time going into second, then pop it went. Any way I had the first belt it had no wear on it and the was straight lined not like atear or anything.
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Road Master
Joined: Jul 2006
Posts: 886
Likes: 4
From: Virginia
I've never experienced this on a bike, but I do design machinery that uses timing belts.
The type of break you are describing, a sharp straight across cut is normally associated with the belt tooth riding up and onto the tooth of a pulley, instantly the belt loads multiply past the belt's strength and snaps the belt in two.
You are giving the belt a reversing load when you down shift, the wheel wants to continue moving forward and the belt wants to stop or slow down with the transmission.
A loose belt in this loading condition will cause what you are describing. Alignment may also be a problem, with the belt trying to ride up the flange of the rear pulley as it's trying to go the opposite direction (reversing load). Once it starts to ride up the flange, it slips a belt tooth onto a pulley tooth and snaps the belt as well.
I would start with making sure the belt is correctly tensioned and everything aligned.
The type of break you are describing, a sharp straight across cut is normally associated with the belt tooth riding up and onto the tooth of a pulley, instantly the belt loads multiply past the belt's strength and snaps the belt in two.
You are giving the belt a reversing load when you down shift, the wheel wants to continue moving forward and the belt wants to stop or slow down with the transmission.
A loose belt in this loading condition will cause what you are describing. Alignment may also be a problem, with the belt trying to ride up the flange of the rear pulley as it's trying to go the opposite direction (reversing load). Once it starts to ride up the flange, it slips a belt tooth onto a pulley tooth and snaps the belt as well.
I would start with making sure the belt is correctly tensioned and everything aligned.
Last edited by Hog Yild; Aug 7, 2008 at 07:35 AM.