US 12,435,491 B1
Hydraulic cylinder with an integrated pressure relief system
Jason K. Carton, Geneseo, IL (US)
Assigned to Deere & Company, Moline, IL (US)
Filed by Deere & Company, Moline, IL (US)
Filed on Apr. 4, 2024, as Appl. No. 18/627,111.
Int. Cl. E02F 9/22 (2006.01)
CPC E02F 9/2264 (2013.01) [E02F 9/226 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A grapple hydraulic cylinder, comprising:
a barrel body;
a piston-rod assembly operably connected to the barrel body, the piston-rod assembly and barrel body defining a rod side chamber; and
a cap operably connected to the barrel body, the cap and the barrel body defining a cap side chamber, and the cap having a through hole defined therein for fluid communication from the cap side chamber to the rod side chamber; and
a pressure relief system integrated with the cap and operably connected to the rod side chamber and the cap side chamber and configured to move hydraulic fluid between the cap side chamber and the rod side chamber to reduce pressure in the cap side chamber or the rod side chamber, comprising:
a pilot operated check valve; and
a relief valve configured to open upon the cap side chamber or the rod side chamber reaching a predetermined pressure.