Posted by JD Seller on September 30, 2016 at 19:07:03 from (208.126.198.123):
In Reply to: Hydraulic cylinder posted by craigco on September 30, 2016 at 18:53:06:
When extending the area effected by the pressure of the oil is larger so it has more force pushing. The diameter of the ram shaft reduces the area on the retracting side. There fore the force is reduce by the size of the rod.
Example using a 3 inch cylinder with a one inch rod. Hydraulic pressure of 2000 PSI:
Radius squared x 3.14 x pressure
(1.5 x 1.5) x 3.14 x 2000 = 14130 lbs. of force when pushing.
(1.5 x 1.5) x 3.14 = 7.065 square inches minus (.5 x.5) x 3.14 = 0.785 7.065 - .0785 = 6.28 6.28 x 2000 = 12560 lbs. of pulling force when retracting.
So you can see that the cylinder has 1570 lbs. less force when retracting.
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