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Author: Subject: Linear Actuator for Handbrake
scootz

posted on 1/11/11 at 10:00 AM Reply With Quote
Linear Actuator for Handbrake

I've decided to go with a spot-caliper on the single-rear wheel of the reverse-trike and fancy controlling it with a linear actuator as I'm struggling for room for a handbrake-lever.

I've found a couple of actuators that can pull and hold a force of 10kg... anyone have any idea if that would be enough to pull-on a spot-caliper and hold a 275kg vehicle?

Cheers!





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MakeEverything

posted on 1/11/11 at 10:21 AM Reply With Quote
Does it fail on or off when you have a power failure? I thought the emergency brake had to be mechanical.





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mcerd1

posted on 1/11/11 at 10:22 AM Reply With Quote
does that mean they'd need to be powered to hold the brake on or off ??

(as much as I hate them) what about the motors off one of the modern cars that winds in the handbrake cable (like a disco3 for example)
I assume they have some kind of failsafe built in....

[Edited on 1/11/2011 by mcerd1]





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scootz

posted on 1/11/11 at 10:26 AM Reply With Quote
Good points!!!

These are the details here...

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Neville Jones

posted on 1/11/11 at 10:28 AM Reply With Quote
[9.The ‘parking’ braking system must be capable of being operated using a control which is independent of the service brake, and once applied capable of being maintained in the ‘on’ position solely by mechanical means.]

IVA manual, Brakes, 09A, para 9.

Cheers,
Nev.

[Edited on 1/11/11 by Neville Jones]

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scootz

posted on 1/11/11 at 10:29 AM Reply With Quote
The Disco ones would be fine for two handbrake calipers across a shared axle, but no use for a single caliper.





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mcerd1

posted on 1/11/11 at 10:34 AM Reply With Quote
the disco one just winds in a certain number of turns - we found out when it lost the adjustment and never actually wound in enough to pull the brakes on





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blakep82

posted on 1/11/11 at 10:39 AM Reply With Quote
thinking of a car at least, with a lever (giving better mechanical advantage) you'd have to pull about 10kg at least to get it to work, without a lever to pull on, i don't know, but even 20kg pulling direct on the end of the cable i wouldn't expect to be enough.
and it looks llike the arm is plastic. i wouldn't fancy it.
they look ok for pushing or pulling something back and forth, something which won't need a constant pull after its moved.





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matt_gsxr

posted on 1/11/11 at 11:21 AM Reply With Quote
KISS
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wylliezx9r

posted on 1/11/11 at 11:44 AM Reply With Quote
quote:
Originally posted by matt_gsxr
KISS

KEEP IT SIMPLE STUPID ?





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tomgregory2000

posted on 1/11/11 at 12:10 PM Reply With Quote
quote:
Originally posted by wylliezx9r
quote:
Originally posted by matt_gsxr
KISS

KEEP IT SIMPLE STUPID ?


All you need is a brick

Park up, get out, place brick in front or behind wheel, and walk off

sorry no help

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scootz

posted on 1/11/11 at 12:15 PM Reply With Quote
KISS is fine if you have space for a handbrake-lever... I don't!





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mcerd1

posted on 1/11/11 at 12:20 PM Reply With Quote
^^ you could go under the steering wheel (like the dax ones)





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HowardB

posted on 1/11/11 at 12:28 PM Reply With Quote
or one on the outside of cockpit like an old Bentley?

class act with polished silver handle,....!







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matt_claydon

posted on 1/11/11 at 12:52 PM Reply With Quote
I think you'd be looking at 5-10 times that force at least. There are loads of modern cars with electric park brakes, I'm sure one would be suitable.

Because it must be held on by mechanical means, you'll need something that operates using a screw type actuator so it stays where it is when powered off.

[Edited on 1/11/11 by matt_claydon]

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adithorp

posted on 1/11/11 at 01:18 PM Reply With Quote
quote:
Originally posted by matt_gsxr
KISS


That, from you! PMSL





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scootz

posted on 1/11/11 at 01:32 PM Reply With Quote
quote:
Originally posted by matt_claydon
I think you'd be looking at 5-10 times that force at least...


It's just a single Hispec spot-caliper that I'll be using. I'm pretty sure that the mechanism-arm would explode if subjected to 100kg of force.









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Rod Ends

posted on 1/11/11 at 01:43 PM Reply With Quote
2CV handbrake pulls out from under the dash


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matt_gsxr

posted on 1/11/11 at 01:48 PM Reply With Quote
quote:
Originally posted by scootz
KISS is fine if you have space for a handbrake-lever... I don't!


Fair enough.

To be honest (and as Adrian has kindly pointed out) I am not afraid of a bit of complexity.
So here goes!

My thinking is that you need to be able to lock the brake on (as don't want to leave it powered). This managed on commercial systems with a screw thread type mechanism.

I think you can get enough force, just by using more leverage, as you don't need to move the pads very far at all.

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TimEllershaw

posted on 1/11/11 at 02:05 PM Reply With Quote
quote:
Originally posted by adithorp
quote:
Originally posted by matt_gsxr
KISS


That, from you! PMSL


It's good to see your reputation is spreading






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02GF74

posted on 1/11/11 at 02:26 PM Reply With Quote
quote:
Originally posted by scootz
KISS is fine if you have space for a handbrake-lever... I don't!


footbrake, like in Mercs?





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MakeEverything

posted on 1/11/11 at 02:45 PM Reply With Quote
quote:
Originally posted by 02GF74
quote:
Originally posted by scootz
KISS is fine if you have space for a handbrake-lever... I don't!


footbrake, like in Mercs?


Or dash mounted like the really old mercs!?





Kindest Regards,
Richard.

...You can make it foolProof, but youll never make it Idiot Proof!...

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Smartripper

posted on 1/11/11 at 04:57 PM Reply With Quote
hello ,

on my MNR i used VW passat rearcaliper, they have a electric handbrake thats iva proof.

Very easy to wire and they keep activated also when power fails.

Greetings

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