chrisf
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| posted on 1/8/04 at 05:16 PM |
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Pushrod Front Suspension
Hi All:
I'm currently designing my pushrod suspension. When I run my SolidWorks model through the movement, the bellcrank bangs the chassis on full
droop.
I've spent a frustrating amount of time trying different configurations. Does anyone have any pictures of their designs? I'm making my
bellcrank as small/short as possible and this my be one problem. Any pictures or help is appreciated.
I've seen Bob's pushrod setup, and I have a hard time understanding how that works well for him.
--Chris
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Mark Allanson
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| posted on 1/8/04 at 05:33 PM |
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You could always draw in a bump stop
If you can keep you head, whilst all others around you are losing theirs, you are not fully aware of the situation
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Matthew_1
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| posted on 1/8/04 at 06:48 PM |
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There are a few pics in my archive, can post more if you're interested
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Petemate
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| posted on 1/8/04 at 07:31 PM |
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Matthew - tried to look at you photo archive, came up empty. (purely out of curiosity) Am I doing something wrong?.....
Pete(Oldgit)
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Cita
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| posted on 1/8/04 at 07:43 PM |
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Matthew's archive works for me.
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chrisf
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| posted on 1/8/04 at 08:40 PM |
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Yep, Mathew's pics work for me as well. It looks like we're using the same components! I mounted my rocker on top of the chassis, though.
It looks like your design is much more ideal. Thanks for the pics.
I'm using SW as well. Any way you'd same your file?
--Cheers, Chris
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chrisf
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| posted on 2/8/04 at 12:49 AM |
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Thanks
Thanks for the help. I'm miles closer today that yesterday. I ended up Mounting like Mathew and no problems. Just the details to sort.
...ended up being a good Locost day afterall.
--Chris
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Matthew_1
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| posted on 2/8/04 at 08:08 AM |
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My files are all in Autodesk inventor, not sure how compatible they are. I'm happy to send the chassis file if you have some way of converting
it ?
If you do follow the similar design to mine be very careful of the pushrod length and height/dimensions of the pivot bell. It's very easy to get
a stupidly high rising rate which causes a massive amount of stress in all the suspension components.
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JB
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| posted on 2/8/04 at 11:37 AM |
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Dampers
Dampers work on displacement of fluid so ideally you require as much damper fluid displacement per wheel movement as possible. This can be achieved 2
ways, have a damper with a large bore, or make the damper move a lot.
I like 1:1 motion ratios as it makes spring selection and comparision easy.
One advantage of rocker suspension you can arrange for a 1:1 ratio but this means quite large damper movements and consequently large rockers so angle
of operation stays reasonable.
John
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pbura
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| posted on 2/8/04 at 12:59 PM |
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quote:
Originally posted by Matthew_1
If you do follow the similar design to mine be very careful of the pushrod length and height/dimensions of the pivot bell. It's very easy to get
a stupidly high rising rate which causes a massive amount of stress in all the suspension components.
Matthew,
My understanding has been that when the shock is fully compressed, shock and bellcrank should be approaching 90 degrees. Is this correct?
Thanks,
Pete
Pete
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chrisf
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| posted on 2/8/04 at 01:13 PM |
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That is a good question Pete. Also, I just did a rough feasibility design. My bellcrank was a three in triangle. Will this overstress the suspension
system?
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quattromike
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| posted on 20/11/05 at 12:51 PM |
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BELL CRANK RATIO
Sorry for a change of tread but I'm looking at my front suspention and have decided to go for pushrod but I'm unsure how to get the ratio
on the bell crank, I know it's all about different lengths of crank but how can I work it out?
Mike
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chrisf
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| posted on 21/11/05 at 04:04 AM |
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Here you go.
Clicky
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SilverFox
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| posted on 23/11/05 at 03:22 AM |
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still can't get access to Mathew's archive - any tricks?
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kango
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| posted on 23/11/05 at 04:20 AM |
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Me too
Just says "EMPTY"
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Tralfaz
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| posted on 23/11/05 at 10:53 AM |
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Me as well.
Can anyone post the direct link to the photos?
Thanks
B
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chrisf
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| posted on 23/11/05 at 02:49 PM |
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He took these down quite a while ago. His design looked essentially like the new Caterham with the inboard suspension. I saw his about a year before I
saw the Caterham release, though.
--Chris
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