Accumulator cavity from the bladder into two parts: capsule loaded nitrogen, the extracapsular charge hydraulic oil. When the hydraulic pump hydraulic oil pressure into the accumulator, the bladder on the compressive deformation of the gas volume increase with the pressure reduced. The hydraulic oil is stored. Hydraulic system need to increase the hydraulic oil, the accumulator to the hydraulic oil discharged, the energy of the system to be compensated.

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