Difference between hydraulic/pneumatic cylinders?

Post by Doug4d3s » Sun Mar 14, 9:11 am

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The (home-built) bicycle the other person wanted to use hydraulic steering for is a cargo bike called a bakfiets (a massacre of the Dutch term "bakfietsen" for them).

http://www.workcycles.com/home-products ... obike-long

Normally these bikes use a bent tie rod to connect the steering tube arm to one side of the fork. You can see it easily in that photo, painted orange.
The fellow wanted to build a folding bicycle like this--one that just has a flat rack up front (not a box) and that folded in half right ahead of the steering tube. So he wanted an easy way for the steering gear to fold along with the rest of the bike.

,,,,,,I don't think the pressures with a pneumatic-->hydraulic bicycle steering setup would really ever be that great. You can take any bicycle out there, brace the front wheel between your legs, and twist the handlebars left or right and the stem will slip on the steering tube. It doesn't take a whole lot of torque to steer a bike, even a MTB riding off-road. And a bakfiets is very much an on-road bike for certain.

It might be difficult for other reasons though. You would get leakage (so you'd need a reservoir) and you'd need a way to equalize the fluid on both sides of the cylinders.
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Well, I would figure that if you did want to use the little air cylinders for fluid, that you would not be able to drive them with any regular pump setup. It would be a hand-operated thing (another cylinder, pushed/pulled by hand) and you'd still probably want a PSI gauge in there and a adjustable relief valve.--------The (home-built) bicycle the other person wanted to use hydraulic steering for is a cargo bike called a bakfiets (a massacre of the Dutch term "bakfietsen" for them).Normally these bikes use a bent tie rod to connect the steering tube arm to one side of the fork. You can see it easily in that photo, painted orange.The fellow wanted to build a folding bicycle like this--one that just has a flat rack up front (not a box) and that folded in half right ahead of the steering tube. So he wanted an easy way for the steering gear to fold along with the rest of the bike.,,,,,,I don't think the pressures with a pneumatic-->hydraulic bicycle steering setup would really ever be that great. You can take any bicycle out there, brace the front wheel between your legs, and twist the handlebars left or right and the stem will slip on the steering tube. It doesn't take a whole lot of torque to steer a bike, even a MTB riding off-road. And a bakfiets is very much an on-road bike for certain.It might be difficult for other reasons though. You would get leakage (so you'd need a reservoir) and you'd need a way to equalize the fluid on both sides of the cylinders.

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