Hydraulic Accumulator Assembly

A work vehicle, comprising:

• a frame;
• a ground engaging apparatus coupled to the frame and configured to support the frame above a surface;
• a work tool coupled to the frame;
• and
• a hydraulic system, comprising:
• at least one work tool moving circuit, comprising:
• a hydraulic cylinder comprising a housing, a piston configured to reciprocally move within the housing and divide a chamber of the hydraulic cylinder into a cap side chamber defining a bottom of the housing and having a first fluid and a rod side chamber having a second fluid, the piston coupled to one end of a piston rod, and the other end of the piston rod coupled to the work tool;
• a pressurized hydraulic fluid configured to enter one of the cap side chamber and rod side chamber;
• a first control valve comprising a plurality of first valve positions configured to selectively switch a direction of the pressurized hydraulic fluid entering the housing of the hydraulic cylinder to move the piston and configured to block the pressurized fluid from entering the housing of the hydraulic cylinder to substantially maintain a position of the work tool;
• and
• a gas-charged hydraulic accumulator assembly hydraulically coupled to the cap side chamber of the hydraulic cylinder and the first control valve therebetween, the gas-charged hydraulic accumulator assembly configured to absorb an impact from the work tool which increases a pressure of the first fluid, the gas-charged hydraulic accumulator assembly comprising:
• a first accumulator having a first gas and configured to receive the first fluid;
• and
• a second accumulator coupled to the first accumulator and having a second gas, a pressure of the second gas in a second pre-charged status being higher than a pressure of the first gas in a first pre-charged status, and the second accumulator configured to receive the first fluid.