×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

12V Hydrostatic Pump

12V Hydrostatic Pump

12V Hydrostatic Pump

(OP)
I have been given the task to source a 12V hydraulic pump that will generate 5GPM flow and be able to withstand the ruggedness of off road racing.

I dont deal with pumps so I figured I would come here and ask on some recomendations for quality pump brands as well as a place I might go to find said pump.

This is for a rear steer off road vehicle application. All the information I can find is based on front steer hydraulic units running off of an engine driven pump.

Thanks

Kris

RE: 12V Hydrostatic Pump

Hi kritter,
   
  The one performance item missing is the max. pressure required of the 5GPM pump output.  Without that, it is difficult to come up with a HP rating which will lead to sizing the 12v motor/pump setup.  

  One good thing about hydraulics is that you can separate the pump and rear steer valve/actuator with hard piped and/or flexible lines.  So, you could still drive the pump with the engine.

RE: 12V Hydrostatic Pump

Contact the guys who do the hydraulic suspension - low riders and 'car dancers' - most of them have sources. Otherwise I'd start with Parker Hyd and Greenlee who do the hyd pumps/motors for industry

"If A equals success, then the formula is: A = X + Y + Z, X is work. Y is play. Z is keep your mouth shut."
-- by Albert Einstein

RE: 12V Hydrostatic Pump

(OP)
CCW...I havent gotten a straight answer on pressure. I took an educated guess at 1000-1500 psi. I found a pump from Haldex but at 1500psi it doesnt supply enough flow. They specialize in hydrostatic pumps and control valves but mostly 24 volts and up. The car cannot be plumbed off the motor as it would require an pump or serious pump and reservoir modifications, more bracketry, and more TIME which is something we dont have right now.


Sprint Car...I contacted reds hydraulics who is the leader in the hopping car industry and they make their own pumps but were not only clueless to what a pump curve is, they didnt have much faith in their pumps working at 12 volts since the systems most often run in those cars are 24 volts up to 96 volts. I asked for flow rates, current consumption etc...and all they new was 24 volts equalled 2500psi and 96 volts equalled 12 ksi.


Thanks for the help, hopefully I can get a straight answer on what psi is needed from the Ram company.

RE: 12V Hydrostatic Pump

Hi Kritter,

This works out to about 3 HP peak at 1000 psi peak for 5 gpm.  A continuous rated motor at 2HP might be about right.  One big problem is high current draw at 12 VDC.  This is really going to dim the lights.  You will need a big alternator to keep up.  You can begin to see why the hopping car guys use 24-96 volts.

As an example look at the motor specs. over at:

http://www.robotcombat.com/marketplace_motors_ame.html.

RE: 12V Hydrostatic Pump

Hi again Kritter,

  While you are looking, punch in "electric power steering" in the google search engine. Honda and others needed power steering when the engine was not running on their hybrids so they offered all electric power steering.
This may be a little more efficient than the 12VDC/hyd.pump/steering system you are contemplating.

  See the article at
http://www.embedded.com/showArticle.jhtml? articleID=164904435  

RE: 12V Hydrostatic Pump

(OP)
Although electric steering would be the way to go a la Delphi on the GM rear steer. Time is not on my side to design/educate myself on an electric steer.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources