- This topic has 20 replies, 5 voices, and was last updated 13 years, 3 months ago by
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Update on my steering brake mod. It works great and I'm very pleased with it's functioning. There is a better feel for when the clutch releases and the brake is applied. There is also less pedal movement required.
I tried to take some pics and a video but the space where all the action takes place makes it almost impossible.
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Here is the pic of the mod. The geometry configuration of the cable allows for twice the take up rate of the brake actuating arm over the straight rod linkage, compensating for the slack in the actuating links at the brake band anchor points (and it feels like power brakes too).
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That's a really excellent mod, Bob! Elegantly simple solution to the problem and only adds one moving part to the assembly. Hard to beat that when you net a 2X take-up rate on the brake bands. That looks like one the factory should incorporate, though it is simple enough that it can be done by anyone with a few hand tools and a bit of time. Well, and a crawlie that need it…makes me wish you owned a wheelie so you could come up with similar great ideas for it that I could actually use myself.
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You all are going to have to talk real slow now. I had trouble wrapping my brain around the 2x take up rate but now I see it.
http://www.the-office.com/summ…..basics.htm
What you have is a movable pulley system as I see it. Your foot pressure would be the weight and the force on the brake lever P. Does this mean one would have to push twice a hard on the pedal with this pulley system versus a straight lever system?
More to follow when we can talk faster.
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Thanks guys.
Pete,
There are more forces involved than a simple class 2 pulley system. The movable pulley anchor point is about 3″ up from the pivot (fulcrum for the second class 1 lever system) point. The distance from the pulley anchor point is over a foot. There is a tremendous mechanical advantage there that overcomes any losses in the pulley system. In essence, the pulley system efficiency is compounded.
Hope that explanation works.
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That helps… now off to school I go.
Edit:
Ouch, makes my brain hurt. When I retired, I think my brain also retired. Looks like I will have to make a model and do it empirically. Like, what would happen if the pulley was on the break arm instead of the pedal?
Some additional questions Bob:
How do you plan to adjust for brake wear?
How did you make sure the steering clutch was open before brake was applied?
Unrelated to mod….How did you adjust your steering clutch?
Bob, I think you can start wearing your cape.
Phil
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Some additional questions Bob:
How do you plan to adjust for brake wear?
There is no real adjustment for that per se, but the pedal travel is adjusted by taking up on the eye bolt.
How did you make sure the steering clutch was open before brake was applied?
Actually, I didn't touch the clutch adjustment, it was still within spec. It still fully releases after about 1-1/2″ to 2″ of pedal travel, at which time all of the slack is out of the brake band and it is being applied from that point on at 2x the normal rate, so you actually have less pedal travel to achieve full braking capacity.
Unrelated to mod….How did you adjust your steering clutch?
By the book.
Bob, I think you can start wearing your cape.
At no point did I say we have reached the promised land, and I have no idea why I insist on calling you Pete. Account deleted.
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