1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Hydraulic force

  1. Oct 21, 2015 #1
    Most examples of hydraulic mechanical advantage display a little force on a small piston traveling a long distance to move a bigger piston a short distance with a lot of force.

    With the inverse, if we have an input of:
    100 lbs of force on a 3" diameter piston traveling 1"
    the output would be
    33 lbs of force on a 1" diameter piston traveling 3"
    and this is true for single pistons.

    What happens if the output is forked into 2 or more pistons as my illustration shows?
    To have the same travel & force on the small diameter output pistons, would the travel & force on the input piston need to change at all? Or will it stay the same (as with a single output cylinder)?
    Thanks in advance.
     

    Attached Files:

    • hyd.jpg
      hyd.jpg
      File size:
      16.7 KB
      Views:
      79
  2. jcsd
  3. Oct 21, 2015 #2

    CWatters

    User Avatar
    Science Advisor
    Homework Helper

    I might be a bit rusty but are you sure about this example?

    100lbs on a 3" diameter piston is 14psi
    33lbs on a 1" diameter piston is 38psi
     
  4. Oct 21, 2015 #3
    You can't use just the diameter of the pistons. You have to calculate the area of each piston.

    Piston A = 3 square inches
    Piston B = 1 square inch

    Applying force to Piston A to move it 1 inch will move Piston B 3 inches, with 1/3rd the output force.
    Applying force to Piston B to move it 3 inches will move Piston A 1 inch, with 3 times the output force.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Hydraulic force
  1. Hydraulics question (Replies: 1)

  2. Hydraulic Systems (Replies: 1)

  3. Hydraulic energy (Replies: 9)

Loading...