RazMan
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| posted on 22/3/07 at 12:05 PM |
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Electric Handbrakes
I'm thinking about a future project and if I could design in an electrically operated handbrake it would save a lot of messing about.
iirc the SVA manual doesn't really specify the method of handbrake activation, but I can't see why a stepper motor pulling a caliper (with
a ratchet of some sort) cant be used. Someone mentioned that the Ford C-max has already incorporated something similar but I have yet to find any info
on this.
Has anyone got any ideas or comments?
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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balidey
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| posted on 22/3/07 at 12:11 PM |
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Lots of the new renault have them. Takes a while to get used to.
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scottc
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| posted on 22/3/07 at 12:13 PM |
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Someone on here has done this pre-SVA and it passed SVA. Can't remember who it was though.
here
[Edited on 22/3/07 by scottc]
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speedyxjs
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| posted on 22/3/07 at 12:15 PM |
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All new jags have them too!
How long can i resist the temptation to drop a V8 in?
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RazMan
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| posted on 22/3/07 at 12:41 PM |
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CaLviNx - Ahhhh I remember the thread now. That linear motor looks ideal - have you got any info on it?
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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RazMan
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| posted on 22/3/07 at 03:11 PM |
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Sorry, I meant a manufacturer or supplier  Had a look on eBay and havent found anything yet.
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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02GF74
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| posted on 22/3/07 at 03:28 PM |
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hmmmm, so if you break down due to battery failure and need to stop, this is when you need the handbrake the most, wotcha gonna do?
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RazMan
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| posted on 22/3/07 at 04:06 PM |
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Chuck a brick under the wheel? 
I admit that my plan is slightly flawed but I'm looking at a solution (not the brick) 
The ideal gizmo is called a Linear Actuator which will pull 1200N  which should be enough for most applications. I am hoping to use the existing
Sierra handbrake setup and retro fit the actuator in the service tunnel (more or less in the orginal handbrake lever position) A three way rocker will
be the ideal switch as it has a lower profile for SVA.
[Edited on 22-3-07 by RazMan]
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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DaveFJ
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| posted on 22/3/07 at 04:47 PM |
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quote:
Originally posted by 02GF74
hmmmm, so if you break down due to battery failure and need to stop, this is when you need the handbrake the most, wotcha gonna do?
I thought that was the exact reason why hydraulic handbrakes were not allowed. I'm amazed that these are legal!
Dave
"In Support of Help the Heroes" - Always
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Peteff
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| posted on 22/3/07 at 04:50 PM |
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so if you break down due to battery failure and need to stop, this is when you need the handbrake the most, wotcha gonna do?
Use the footbrake 
If you have an electrical handbrake does it need a failsafe device? Do you have the current applying the brake or a spring applying the brake and the
current holding it off like an air brake type system?
[Edited on 22/3/07 by Peteff]
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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RazMan
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| posted on 22/3/07 at 05:15 PM |
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The system is basically a stepper motor and a worm drive. You throw a switch to 'pull' the brake cable (or lever etc) and the nature of
the gearbox prevents rotation until a reverse voltage is applied to the motor when the cable is released.
Hydraulic brakes depend on the same circuit as the main braking system so that is a no-no for sva and mot, however I don't see any reason why
you can't have a secondary hydraulic caliper mounted on the same disc - it might not be cost effective though.
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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RazMan
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| posted on 22/3/07 at 06:35 PM |
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I doubt that a seat motor would have the oomph to pull on a handbrake, but I suppose with a long enough throw anything is possible. I have found a
couple of suppliers for the high strength actuators. This one seems the best so far and less than £80 too.
http://www.hiwinactuators.co.uk/linear_actuators.html
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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gttman
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| posted on 22/3/07 at 07:28 PM |
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quote:
Originally posted by RazMan
I'm thinking about a future project
Already? I havn't even been for a ride in you Aeon yet!
Andygtt
Please redefine your limits
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RazMan
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| posted on 22/3/07 at 10:27 PM |
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You may find the actuating time will suffer as a result of the gearing but it is certainly worth a try. The ones I have found operate at 25mm per
second and I estimate that the cable will need to have around 20mm travel, so less than a second to fully actuate the handbrake.
Andy, Hi mate - this is not for my car It is a hush hush project which MIGHT happen soon. I will divulge all in due course. Are you still in SA?
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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