Three-air-chamber energy accumulator, hydro-pneumatic suspension device and engineering vehicle

The utility model discloses a three-air-chamber energy accumulator, a hydro-pneumatic suspension device and an engineering vehicle. The three-air-chamber energy accumulator comprises an air chamber cylinder, a low-pressure air chamber cylinder and a high-pressure air chamber cylinder which are different in volume. One axial opening end of the air chamber cylinder is communicated with one axial opening end of the oil liquid through cylinder, and one axial opening end of the low-pressure air chamber cylinder is communicated with the other axial opening end of the oil liquid through cylinder; the radial circumferential surface of the oil liquid through barrel is communicated with the high-pressure oil liquid barrel through a hydraulic oil pipe, and an axial opening end of the high-pressure air chamber cylinder is communicated with the high-pressure oil liquid barrel, so that two communicated oil liquid chambers and three air chambers with different pressures are formed; the other axial opening ends of the air ch