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

You could always draw in a bump stop

There are a few pics in my archive, can post more if you're interested

Matthew - tried to look at you photo archive, came up empty. (purely out of curiosity) Am I doing something wrong?.....
Pete(Oldgit)

Matthew's archive works for me.

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

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

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.

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

quote:

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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.

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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?

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

Here you go.

Clicky

still can't get access to Mathew's archive - any tricks?

Me too

Just says "EMPTY"

Me as well.

Can anyone post the direct link to the photos?

Thanks

B

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