Cable Actuated Hand Clutch

[Mehul Botadra]

Hello,

We are looking to implement the hand clutch this year. However we do not wish to use a hydraulic or a pneumatic assisted system. Its pertinent that we use a directly actuated cable clutch. We use a Honda CBR 600 F4i. Does anyone have an idea about the advantage ratio on the bike clutch lever? Also the clutch travel and the force required for actuation?

I did some research and testing on our engine, but I'm not entirely sure if the data is correct.

Force required - 25kgs tops
Travel - 12mm(Considering the arc to be a straight line, well almost)

We tried using a clutch with advantage ratio of 1 and the pedal bent. We also tried increasing it to 2 and still bent! I've designed the new one at 3.33, but I'd still want to be sure. Thanks!

[Mehul Botadra]

Hello,

We are looking to implement the hand clutch this year. However we do not wish to use a hydraulic or a pneumatic assisted system. Its pertinent that we use a directly actuated cable clutch. We use a Honda CBR 600 F4i. Does anyone have an idea about the advantage ratio on the bike clutch lever? Also the clutch travel and the force required for actuation?

I did some research and testing on our engine, but I'm not entirely sure if the data is correct.

Force required - 25kgs tops
Travel - 12mm(Considering the arc to be a straight line, well almost)

We tried using a clutch with advantage ratio of 1 and the pedal bent. We also tried increasing it to 2 and still bent! I've designed the new one at 3.33, but I'd still want to be sure. Thanks!

[Carrington]

Our Honda 450s require more pull force, at about 30 kG. Travel is about the same. Our advantage ratio is 3 to 1.

But.... you need to design the system to not only strong enough to actuate the clutch, but be able to withstand the driver yanking on it hard during a panic situation. This will be many time higher.

[Mehul Botadra]

Agreed. But the force was around 20-22 kgs! So we considered 25 only!

[The AFX Master]

Not sure about ratio, but we managed to mount our clutch behind the steering wheel using a lever and standard bike clutch cable, so it were close to driver´s hands in a near stall situation or offtrack excursion. Not sure about the load, but a driver could disengage it with one hand comfy.

Drivers love it tough... (when correctly done and mantained i should say).

Lube the thing periodically (grease on the cable), and mount the lever in good and stiff bushings. You need to eliminate any compliance and extra stiction.