Two effect multi -stage cylinder of compact high reliability

The utility model discloses a two effect multi -stage cylinder of compact high reliability, include: cylinder, cylinder bottom, one -level piston rod, second level piston rod, one -level piston and second grade piston, it firstly has pole chamber, second to have pole chamber and first no pole chamber to form, sealing member on one -level piston and the second grade piston is glyd ring, and the one -level piston is fixed with logical oil pipe, is equipped with first uide bushing on the second grade piston, and it does not have the pole chamber to form the second between one -level piston, logical oil pipe, second grade piston and the first uide bushing, seted up axial oil duct and radial oil duct on the one -level piston, second level piston rod's rear portion is equipped with one and crosses the oilhole, still include second uide bushing and third uide bushing, sealed on second uide bushing and the third uide bushing is this special sealing and adds the rem and seal the combination, is equipped with first hydraulic fluid port and second hydraulic fluid port on the cylinder bottom. In this way, the utility model discloses designing the hydraulic fluid port on the cylinder body, guaranteeing that the radial dimension of hydro -cylinder is less, the sealed system performance of hydro -cylinder is good in addition, long service life.