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  #1  
Old 05-03-2013, 06:38 AM
Big time Big time is offline
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Will electric motors replace hydraulics in active suspensions and bulldozers?

Once upon a time even power windows and convertible tops were hydraulically operated.
Now they are electric.
Even some newer power steering systems are electric.

Will this trend continue to the point where self leveling or even active suspension systems are completely electric?
Thus they will eliminate leak prone systems. Making active suspension a dream come true.

Will heavy machinery (i.e. bulldozers) hydraulics be replaced as well?
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Old 05-03-2013, 06:42 AM
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In all likelyhood the answer is yes, given a long enough timeframe.

Next.
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Old 05-03-2013, 10:47 AM
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unlikely on heavy stuff. Linear actuators aren't that powerful and given the laws of physics unlikely to be so
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Old 05-03-2013, 02:03 PM
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I don't think they scale as well as hydraulics. You can make pressure differential and their mechanical advantage works for you with hydraulic. With electric you need bigger hardware for bigger force.

Even in the case of EPS system, certain packaging precludes their use. BMW 5 series for example I believe uses EPS on V8, RWD cars. But Inline 6 and AWD cars cannot package the EPS motor.

Granted pimento's point is true, as some of the hurdle may be overcome given improvement in technology...
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Old 05-03-2013, 02:27 PM
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hmm the packaging not that difficult as even the larger vehicle motors are quite small.
Does BMW go for motor in the rack maybe ? Rather than motor on the steering column ?
I wonder how well EPS does with feel on a heavier car. It may be the feedback movement that it doesn't do well ? hmmm gonna think about that one
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Old 05-03-2013, 03:30 PM
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ZF setup is typically motor in the rack. And ZF setup is prevalent in majority of the EPS cars....
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Old 05-03-2013, 05:10 PM
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Not necessarily here.
Ford, Vauxhall/Opel, Fiat are models I know are running them on the column.
( The Corsa one is often used in Mk1 and 2 Escorts to get power steering for the rally boys )

Not sure about the heavier cars tho'
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Old 05-03-2013, 05:52 PM
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Quote:
Originally Posted by Matra et Alpine View Post
unlikely on heavy stuff. Linear actuators aren't that powerful and given the laws of physics unlikely to be so
Yae cannae... Etc.
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Old 05-03-2013, 06:09 PM
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ah that quality Canadian accent
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Old 05-03-2013, 07:13 PM
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ah that quality Canadian accent
Wow, I just heard it. As a kid, I think maybe that passed for Scottish due to me being 0 years old.

Now... Oh my. That is just nothing. That isn't even a lightyear (badum-tish!) away from Scottish.
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Old 05-03-2013, 10:21 PM
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Quote:
Originally Posted by Matra et Alpine View Post
Not necessarily here.
Ford, Vauxhall/Opel, Fiat are models I know are running them on the column.
( The Corsa one is often used in Mk1 and 2 Escorts to get power steering for the rally boys )

Not sure about the heavier cars tho'
Electric power steering Servolectric ZF Lenksysteme

They make a few types, but I am guessing as you mentioned it might be load dependent...
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  #12  
Old 05-04-2013, 02:59 AM
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Looks like it, packaging the motors of appropriate size the problem likely.
Quote:
•Servo unit on the steering column: for steering axle loads up to 1,000 kg
•Servo unit on a second pinion: for steering axle loads up to 1,200 kg
•Paraxial servo unit: for steering axle loads up to 1,600 kg
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  #13  
Old 06-27-2015, 12:37 AM
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Electric cars are here to minimize the fuel consumption and it may work better than hydraulics, if the engineering is made that perfect.
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  #14  
Old 08-25-2015, 04:47 PM
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Damping suspension motion with electric generators rather than hydraulic shock absorbers. http://www.designfax.net/cms/dfx/ope...t=motion&pn=01
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