Bi-amortisseurs à biellettes !

Effet d'optique, certes, la roue n'est pas parfaitement droite sur la (les) photo(s) mais il n'empêche que quelque soit la photo, que l'on se fie à la courbure du guidon ou à la barre de renfort, ça semble décalé dans les pontets

Le personnage est fantastique, sa meule en revanche [Vous devez être inscrit et connecté pour voir cette image]

don't know if I posted this on here yet, but I've invented my own "Bi-amortisseur à biellettes" for my Honda Sky MobCross. I wanted to solve 2 problems :
with only a single shock on the left (as original), there was not a lot of progressiveness and botttoming out after jumps made the rear-frame twist (already "twisted 2 frames to the bin"). So I wanted shocks on both sides to prevent the twisting and I wanted a lot more progressiveness. Did it by making also a left swing arm on which I could put another shock and put it in series with the left one by 2 arms which are both connected to an axle on bearrings.

the way it works :
the left one lying down is automaticaly softer compared to the standing right one because it is compressed less when the swing arm goes up. because of this, the right one acts like a stiff bar at first.
so as the swing arm goes up it compresses the left one, but the right one also goes up, pushing against the arm and making the axle turn (clockwise looking at the first picture). as a result, the arm on the left sides also compresses the left shock from the top. so it is compressed from both sides.
once the left one is fully compressed, the system reverses and the left one acts as a stiff bar, making the axle turn in the opposite direction and compress the right one from both sides.

by playing with the length of the arms (I've made them adjustable with thread) I can change the rate in which way they influence the shock-travel. for example : if I lengthen the right arm, in the beginning it will make the axle turn less (because of the bigger radius) and therefore compress the left one less making it softer. than as the system reverses, the longer arm will compress the right one more making it stiffer.

it was a lot of work trying to figure everything out (where to put the axle, the positions to put the shocks in, the length of the arms, the spring-rates) but it workes really well giving me a soft springrate for "riding" while also giving me a harder springrate for jumping. and if I would still botoom-out the suspension, there is no longer a twisting force on the frame. and as a bonus I've got more suspension-travel tha would be possible with a single shock.

[Vous devez être inscrit et connecté pour voir cette image]

[Vous devez être inscrit et connecté pour voir cette image]

JanBros a écrit:

don't know if I posted this on here yet, but I've invented my own "Bi-amortisseur à biellettes" for my Honda Sky MobCross. I wanted to solve 2 problems :
with only a single shock on the left (as original), there was not a lot of progressiveness and botttoming out after jumps made the rear-frame twist (already "twisted 2 frames to the bin"). So I wanted shocks on both sides to prevent the twisting and I wanted a lot more progressiveness. Did it by making also a left swing arm on which I could put another shock and put it in series with the left one by 2 arms which are both connected to an axle on bearrings.

the way it works :
the left one lying down is automaticaly softer compared to the standing right one because it is compressed less when the swing arm goes up. because of this, the right one acts like a stiff bar at first.
so as the swing arm goes up it compresses the left one, but the right one also goes up, pushing against the arm and making the axle turn (clockwise looking at the first picture). as a result, the arm on the left sides also compresses the left shock from the top. so it is compressed from both sides.
once the left one is fully compressed, the system reverses and the left one acts as a stiff bar, making the axle turn in the opposite direction and compress the right one from both sides.

by playing with the length of the arms (I've made them adjustable with thread) I can change the rate in which way they influence the shock-travel. for example : if I lengthen the right arm, in the beginning it will make the axle turn less (because of the bigger radius) and therefore compress the left one less making it softer. than as the system reverses, the longer arm will compress the right one more making it stiffer.

it was a lot of work trying to figure everything out (where to put the axle, the positions to put the shocks in, the length of the arms, the spring-rates) but it workes really well giving me a soft springrate for "riding" while also giving me a harder springrate for jumping. and if I would still botoom-out the suspension, there is no longer a twisting force on the frame. and as a bonus I've got more suspension-travel tha would be possible with a single shock.

[Vous devez être inscrit et connecté pour voir cette image]

Quite ingenious Jan