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Re: How could a vane pump provide max pressure at low RPM?
Posted by jerrit (more from jerrit) on Thu, 23 Apr 2009 14:52:11
In Reply to: Re: How could a vane pump provide max pressure at low RPM?, DrewP , Thu, 23 Apr 2009 12:20:11
http://auto.howstuffworks.com/steering4.htm

"""
As the vanes spin, they pull hydraulic fluid from the return line at low pressure and force it into the outlet at high pressure. The amount of flow provided by the pump depends on the car's engine speed. The pump must be designed to provide adequate flow when the engine is idling. As a result, the pump moves much more fluid than necessary when the engine is running at faster speeds.

The pump contains a pressure-relief valve to make sure that the pressure does not get too high, especially at high engine speeds when so much fluid is being pumped.
"""

So yeah, it seems like most of the work being done by the pump at high speeds is just wasted.

posted by 216.239....
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