Hydropneumatic energy reservoir for accumulating the braking energy recovered on a vehicle

A combined high pressure-low pressure hydraulic accumulator for a vehicle, said accumulator combining a high pressure hydraulic accumulator located in a casing, and a low pressure hydraulic accumulator comprising the space between said high pressure accumulator and said casing, wherein

• said high pressure hydraulic accumulator comprises several bodies, each including a tubular wall, an hydraulic end at an end of said wall with a fitting for hydraulic connection, a pneumatic end at the other end of said wall with a valve and a pneumatic connection for precharging air pressure in said body and checking said pressure, a tie-rod axially located in said body and prestrained between both ends to press said hydraulic end and said pneumatic end toward said wall, and a tubular bladder surrounding said tie-rod and tightly connected to said wall at the vicinity of said pneumatic end and to said tie-rod at the vicinity of said hydraulic end;
• said casing comprises a shell with a front end plate at an end thereof and a back end plate at another end thereof, said front end plate being provided with an aperture large enough for freely introducing and extracting all said several high pressure bodies at a time;
• said bodies being all connected, each by said fitting of its hydraulic end, to a single member forming together a manifold for mechanically and hydraulically connecting all said hydraulic ends in parallel to a common high pressure input-output, and a cover for closing said aperture of said casing.