Rapid Brake Bias Adjuster

Here are our CFD links and discussions about aerodynamics, suspension, driver safety and tyres. Please stick to F1 on this forum.
hardingfv32
hardingfv32
35
Joined: 03 Apr 2011, 19:42

Re: Rapid Brake Bias Adjuster

Post

Ferrari demonstrated complete agreement with my desire to maintain maximum brake system efficiency. I state as evidence Ferrari's use at one point in time of dual stage MC. Two pistons in one MC, a large piston for high volume, low leverage flow and a small piston for low volume high leverage flow. The large piston was concerned with moving the pads onto the disc and the small piston with the actual pad to disc pressure. Ferrari was clearly concerned with brake system efficiency.

I challenge you to design 'shuttle system which xxChrisxx has mentioned':
"Getting the normal push/pull cable usually found on sway bar systems to bend 90 degs so that its linear motion is on the same axis as the balance bar is NOT possible inside the foot well of a F1 car without encumbering the free motion of the MC shafts. The MC of most the current F1 cars seem to have a conventional spacing between cylinders and a center location in the bulkhead."

Brian
Last edited by Steven on 25 Dec 2012, 02:24, edited 1 time in total.
Reason: Removed personal comment

gato azul
gato azul
70
Joined: 02 Feb 2012, 14:39

Re: Rapid Brake Bias Adjuster

Post

hardingfv32 wrote:
3) I challenge you to design 'shuttle system which xxChrisxx has mentioned'.

"Getting the normal push/pull cable usually found on sway bar systems to bend 90 degs so that its linear motion is on the same axis as the balance bar is NOT possible inside the foot well of a F1 car without encumbering the free motion of the MC shafts. The MC of most the current F1 cars seem to have a conventional spacing between cylinders and a center location in the bulkhead."

Brian
You can challenge me as much as you like, I just sketched on (took me about 15 min) [...].

So what? Use a small rocker at the side of the chassis to change the direction by 90 deg, or a rack&pinion system if you like, or how about two cables, like a mountain bike brake cable, which both operate in pull , they would be quite easy to bend around in a small(er) radius - the possibilities are endless, just need to use your brain for a bit.

Not sure you are aware, that there exist, "reverse type" pedal boxes, which have a/the balance car at the opposite side, no backwards/forward movement with the pedal --> neat.
A lot less hassle to connect your balance bar cable, or another cable or linkage.

for example:
http://www.apracing.com/drawings/cp5516-7cd.pdf

Maybe, you just need to wait, until someone builds one, and then you can buy it, or copy it from them. [...]

P.S.: And btw, I'm sure, that you don't have the faintest idea, how the Ferrari system worked and what it's purpose was, you just proved that beyond the shadow of a doubt.
Last edited by Steven on 25 Dec 2012, 02:33, edited 1 time in total.
Reason: Removed personal comments

hardingfv32
hardingfv32
35
Joined: 03 Apr 2011, 19:42

Re: Rapid Brake Bias Adjuster

Post

1) I like the idea of a rack and pinion for changing the linear movement to a rotation. There is still a packaging issue because the R&P would probably be fixed to the chassis leaving only 3-5" of flexible output cable to reach the balance bar. There has to be freedom of movement at the balance bar along the longitudinal axis. Now how do you integrate the standard baseline adjustment?

2)"reverse type" pedal boxes, which have a/the balance car at the opposite side, no backwards/forward movement with the pedal --> neat." Does not solve the requirement of a flexible cable at the balance bar.

3) My Ferrari statement stands until you demonstrate otherwise.

I clearly made no mention of the 2007 Macca_Ferrari saga. My point is completely different and directly on point when discuss brake system efficiency.

Brian
Last edited by Steven on 25 Dec 2012, 02:34, edited 1 time in total.
Reason: Removed personal comments

gato azul
gato azul
70
Joined: 02 Feb 2012, 14:39

Re: Rapid Brake Bias Adjuster

Post

Because it's Christmas, and I guess I have a good heart, here a possible implementation of the "shuttle system". [...]

It's pretty self explaining, I suppose. The small colored circles in the red and black squares in the center of the
balance bar (black/fine adjustment) and shuttle (red/ 3 positions) should indicate, that these parts are connected via
a spherical bearing to the next part.
So both the balance bar and the shuttle can pivot around their centers, and relative to each other.
The orange arrow is the effective force application point, between the two M/C's, showing the effective bias between front & rear M/C.

Image
Image
Image

Image
Image
Image

Merry Christmas - to anyone on F1technical
Last edited by Steven on 25 Dec 2012, 02:31, edited 2 times in total.
Reason: Removed personal comments

WilO
WilO
4
Joined: 01 Jan 2010, 15:09

Re: Rapid Brake Bias Adjuster

Post

And a very Merry Christmas to you,Gato Azul.....
Thank you for taking the time to make those illustrations, as always this 'place' is much better due to your contributions.

Brian, I hope you've taken note....even in the posts where Gato Azul claimed he was done with contributing to 'your'
topic, he still gave you an enormous amount of information, even after you accuse him.of handwaving. Given someone of his
experience and knowledge, I'd be a bit more open and appreciative.
Wil

hardingfv32
hardingfv32
35
Joined: 03 Apr 2011, 19:42

Re: Rapid Brake Bias Adjuster

Post

WilO wrote:Brian, I hope you've taken note....even in the posts where Gato Azul claimed he was done with contributing to 'your' topic, he still gave you an enormous amount of information, even after you accuse him.of handwaving. Given someone of his experience and knowledge, I'd be a bit more open and appreciative.
Wil
From the start Azul goes off subject and ridicules me for not accepting his approach to the subject.
I made no complaint and clarified how I wished to approach the subject. From that point his posts become increasingly rude with a lot of 'hand waving'. Little of his 'enormous amount of information' was any help to understanding how a 'rapid brake bias adjuster' until his last post. Even that requires review. I have no idea of his knowledge or experience. It holds no value to me if he cannot stay on topic. I'll be appreciative when I have the understanding I looking for.

Brian

gato azul
gato azul
70
Joined: 02 Feb 2012, 14:39

Re: Rapid Brake Bias Adjuster

Post

In case the last system proved to be to difficult, either to understand or to fabricate, here one of the simplest versions I can think of.
It will work with any pedal box and just requires the one standard balance bar.

It should be simple enough to understand and to build, even for a 12 year old, with nothing more then a LEGO-Technic set, so I think this will do.
Choose appropriated gear ratio to define Quick Adjuster Range --> Adjuster Know will turn (fast) during quick adjustments.
Push Knob towards housing, to disengage gear set, now you can turn the knob, for any fine adjustments, after releasing the Knob, he will re-mesh into gear and this will hold the adjustment in place, as the gear set is locked via the Quick Adjuster Lever detents.

Image

Other possible solutions would/could make use of a rocker/lever between the push rod coming from the balance bar and the push rod of one M/C.
The motion ratio of this rocker (which will feature a slot) will be adjusted via the quick adjuster.
Position End - Mid - End of the slot, but I can't be bothered to draw/sketch it, as Brian doesn't seems all that interested/enthusiastic about my contributions to his thread.

autogyro
autogyro
53
Joined: 04 Oct 2009, 15:03

Re: Rapid Brake Bias Adjuster

Post

My racing mini didnt have a problem.
That had a ramp valve in the rear brake line that progressively shut off the brake fluid the harder the braking became.
I added another valve next to the driver with a large hand operated valve knob for fine adjustment.
Worked OK during the years of mechanical set up.

DaveW
DaveW
239
Joined: 14 Apr 2009, 12:27

Re: Rapid Brake Bias Adjuster

Post

I do wonder about Brian, sometimes. This thread is typical. He starts with an apparently detailed knowledge of a subject & then poses questions aimed a gathering further information, or even solutions to a problem. Here, for example, he has worried the subject until he has extracted a plausible solution, & then declares he has to "review" it. Why?

xxChrisxx
xxChrisxx
44
Joined: 18 Sep 2009, 19:22

Re: Rapid Brake Bias Adjuster

Post

hardingfv32 wrote:3) I challenge you to design 'shuttle system which xxChrisxx has mentioned'.

"Getting the normal push/pull cable usually found on sway bar systems to bend 90 degs so that its linear motion is on the same axis as the balance bar is NOT possible inside the foot well of a F1 car without encumbering the free motion of the MC shafts.
http://en.wikipedia.org/wiki/Schematic

The actual detailed design is irreverent as you can package the elements of the schematic how you see fit. My post couldn't have been that terrible a description of a system for rapid adjustment. As Gato drew a picture very close to what I had in mind.

The question 'what does it look like' generally comes after 'what do I need'.

hardingfv32
hardingfv32
35
Joined: 03 Apr 2011, 19:42

Re: Rapid Brake Bias Adjuster

Post

DaveW wrote:He starts with an apparently detailed knowledge of a subject ....then declares he has to "review" it. Why?
I never meant to imply that I have any detailed knowledge of the subject other then what experience I have from commercially available parts. I made an effort to keep the thread on point so as to extract a mechanical solution that I can appreciate. A mechanical solution still has not been presented. Azul's illustration is not something someone could droop off at a fab shop without further mechanical specifications. I am interested in these mechanical details. It provides me with knowledge that I might use in the future. If one does not have the same interest in the subject as me, them do not participate in the thread.

Have I broken some kind of forum etiquette? Was I rude steering the thread in the direction I wished?

'Why' review?..... Because Azul's solution lacks mechanical details AND he will bad mouth me if I were to present anything but a clear detailed critique. I have to be factual in my response or he will think I am being disrespectful.
Azul was kind enough to hang in with the thread, but does that mean that I must accept his solution as correct?

Brian

hardingfv32
hardingfv32
35
Joined: 03 Apr 2011, 19:42

Re: Rapid Brake Bias Adjuster

Post

xxChrisxx wrote:The question 'what does it look like' generally comes after 'what do I need'.
Not in my case, 'what does it look like' is 'what' is important. A schematic is just the beginning, translating it into a functioning mechanical system is the goal. I was hoping that someone might have direct knowledge as I know that the normal life of a thread probably would not allow development of a mechanical solution. The 'forum' attention span of most posters is simply not long enough.

Brian

xxChrisxx
xxChrisxx
44
Joined: 18 Sep 2009, 19:22

Re: Rapid Brake Bias Adjuster

Post

hardingfv32 wrote:
xxChrisxx wrote:The question 'what does it look like' generally comes after 'what do I need'.
Not in my case, 'what does it look like' is 'what' is important. A schematic is just the beginning, translating it into a functioning mechanical system is the goal. I was hoping that someone might have direct knowledge as I know that the normal life of a thread probably would not allow development of a mechanical solution. The 'forum' attention span of most posters is simply not long enough.

Brian
I don't really get it, you want us to list a fully designed solution?? The schematic that has been posted is a functioning system that would work as intended. I think you need to start again, maybe a new thread. With a bit more focus?

I'm really struggling to understand why you don't find the solution proposed very clear.

EDIT: This is not a dig at you if you don't understand. It's us not explaining something clearly enough.

hardingfv32
hardingfv32
35
Joined: 03 Apr 2011, 19:42

Re: Rapid Brake Bias Adjuster

Post

xxChrisxx wrote:I don't really get it, you want us to list a fully designed solution?? The schematic that has been posted is a functioning system that would work as intended. I think you need to start again, maybe a new thread. With a bit more focus?

I'm really struggling to understand why you don't find the solution proposed very clear.
Yes, I desire to see much more mechanical detail. I seemed to have upset enough people trying to keep this thread on point. Starting again is not going to fly. Anyway, Azul seems to be the only one who has any detailed ideas.

I am not sure that Azul's solution can be implemented and I might not have the mechanical engineering experience to solve for it.

As an example: The red shuttle can not rotate on the same horizontal axis of the black rod or you will not be able make the fine adjustments. Thus the red shuttle must be slotted or splined into the blue peddle housing. Next the red shuttle needs to pivot in the same manner as the yellow shuttles on the ends of each MC. Not sure how to describe it, but say the axis (Z?)coming straight out off your screen. High efficiency balance bar systems use a needle bearing type trunnion system. My AP/Tilton unit is about 50 mm tall in the pivot zone. You are talking another 50 mm for the fine adjustment pivot point and say 6 mm fot the red to blue shuttle splines. That is 106 mm that must be packaged in the maybe 250 mm tall pedal.

Brian

gato azul
gato azul
70
Joined: 02 Feb 2012, 14:39

Re: Rapid Brake Bias Adjuster

Post

o.k. Brian let's see if we can salvage something from this thread

you started out with saying :
Well, I was thinking of the adjustment that we see the driver doing when he moves his hand to the side of the cockpit.
That let me come to the conclusion, that you were talking about the systems used in F1, and I responded to that.
You did no liked it, and you had set your mind, that the systems used in F1 have to be a balance bar adjustment only and nothing else.
Some others commented about some of the details of the Ferrari system, mentioned during Spygate.
I responded, by showing a diagram, which shows, what effects such an system would have on the brake bias of a car.
You didn't liked it, accused me of hand waving and insisted, that these system have to be balance bar adjustments, or adjustments which maintained a fixed brake bias front-rear at all time.
Now, this point is perhaps open to debate, but I accept that you were mainly interested in mechanical solution which only alters the balance bar setting, or the effects this has on brake bias ( discrete change from one fixed ratio to another) ,
but this has perhaps nothing to do with the systems, that are in use in F1, unless you can show photos or mentioning of such a specific system. The reason I ask you to define "Brake Bias" was not to hassle you, but you may want to accept, that it perhaps means different things to different people.
And just because some journalist or driver is talking about a rapid brake balance adjuster, that does not in itself mean, that the only way to do it, is the one you have set your mind too.

About your general way to proceed in discussions on here is, that on one hand you state:
I never meant to imply that I have any detailed knowledge of the subject other then what experience I have from commercially available parts. I made an effort to keep the thread on point so as to extract a mechanical solution that I can appreciate.
but on the other hand, you seem to feel qualified and confident in your knowledge to state, in a matter of fact tone:
2) Losing 'part of the force coming from the pedal' is not acceptable with the forces required to stop a F1 car.
This is not acceptable to F1 designers or in my personal applications.
How do you know that, without detailed knowledge? As you shout into the forrest, so it will come back to you. Don't be surprised that people can't be bothered to explain things to you, when you have already made up your mind.

Furthermore, you stated, that you were just interested to understand the general concept, and how such a system could
possibly look like.
Now you want a full manufacturing drawing, best with tolerances and FEA results, that's perhaps a bit of an ask on a forum such as this.

But even if someone would be kind enough to take up your challenges, how could he do so, without knowing the parameters you have in mind? The only parameter you mentioned so far is fast adjustment speed < 1s.
But how much quick/rapid adjustment do you need/want? +/- 1%, 2% 5% 10%, that would have a influence on the chosen design, the width/travel range of the shuttle for example.
Now you come out and say, it has to fit inside your AP/Tilton pedal etc., that wasn't mentioned before.

So if you really would like a concrete answer, you would need to ask some more concrete questions, define your design parameters how much % +/- adjustment do you want, whats your total adjustment range needed and give some of your constrains.
Otherwise, someone may purpose a design, and you turn around and say, yes but there is my throttle pedal/cable or whatever other constrain you didn't mentioned before, which means that person has just wasted his time trying to help you, but you are still not happy/satisfied. I'm sure most people wont come back for a second time.

Mind about the second solution, I posted, that wasn't meant as a joke, it's probably the fastest and simplest way to build and to integrate with what you have, only need to make some modifications to your Knob / driver interface.

If you have a concrete application in mind you will need to tell us the parameters, otherwise you are the one doing a lot of hand waving, and this thread will go nowhere.

Mind about it for a bit, most people are kind enough to help, if ask nicely.
Merry Christmas Brian