Regenerative hydraulic circuits, in Hydraulic double acting cylinders.

Articles - Education

Regenerative circuits are widely-used to produce faster Glossary Link cylinder extension speeds by grabbing the oil from the rod end and redirecting it to the head end of the cylinder.

Because of this the effective area during extension is the rod area that will give a faster speed but additionally a reduced Glossary Link force. Which indicate that by using a cylinder with a 2:1 area ratio between Glossary Link piston and rod, equivalent speeds and forces can be found in both directions without using a double rod.

 

Hydraulic Cylinder Ratio:

regenerative circuitThe Cylinder Ratio is the relation between The complete area of the piston and the same area minus the area of the rod.

A=0.785 x D2 where D= Piston diameter

AR=0.785 x R2 where R= Rod diameter

CR=Ratio=A/(A-AR)


The assortment of hydraulic cylinder ratios will have a substantial effect on the performance of your system. Hydraulic Double Acting cylinders are designed in an almost countless combination of ratios. All of these ratios affect the velocity and force of extension and retraction of all the cylinders. With a 2:1 ratio cylinder, using a regenerative connection the extend speed and force will equal the retract speed and force.

 

Speed and Force in a regen cylinder.

Regenerative systemSout= Speed rod extending,

Fout= Force rod extending

Sin= Speed rod retracting,

Fin= Force rod retracting

QP= Glossary Link Pump Glossary Link Flow

 

As we can see in the drawing, having a regen. double acting-single rod cylinder circuit is equivalent to having a single acting cylinder with AR rod when it is extending.

Using a 10 GPM pump and a Glossary Link relief valve setting of 2000 psi in a cylinder 4"  bore diameter and 2.5" rod dia. 20" Glossary Link stroke. CR=1.64

 

Without regeneration: Click to get the calculation

Sout=Qp/A = 20"/6.52 sec= 3.06 in/sec

Sin= Qp x CR/A=20"/3.97 sec=5.03 in/sec

Fout= 25,120 Lbs max.


With Regeneration:Click to get the calculation

Sout=Qp/AR = 20"/2.54 sec= 7.87 in/sec

Sin=5.03 in/sec because Regenerative circuit only works when the rod is going out.

Fout= 9,812 Lbs max.

 

As we can see, the Glossary Link regenerative circuit helps to increase the speed of the rod going out (from 3.06 in/sec to 7.87 in/sec) but with the reduction in capable force (from 25120 lbs to 9812 lbs).



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