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I Variable displacement hydraulic pumps

  1. Dec 22, 2016 #1
    In online examples of variable displacement systems with swash-plate pumps, the input pump & motor are usually of equal size. When the constant RPM input pump is at full tilt (max displacement) the fixed displacement motor is at the same RPM for a 1:1 ratio, and when the pump is at no tilt (no displacement) the motor doesn't turn at all, 1:0 ratio. So, the output can reach the same speed or lower.

    If a design requirement was that ratio is 1:3 at maximum displacement, would designing the input pump's pistons to be larger, moving 3 times the volume of the motor's pistons do the trick? I'm trying to design a hydrostatic system for a vehicle, but haven't seen any examples of where the output is speed can be faster than the input. Thanks in advance.
  2. jcsd
  3. Dec 28, 2016 #2
    Thanks for the thread! This is an automated courtesy bump. Sorry you aren't generating responses at the moment. Do you have any further information, come to any new conclusions or is it possible to reword the post? The more details the better.
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