Internal expanding type hydraulic chuck

The utility model relates to an internal expanding type hydraulic chuck, this chuck are equipped with set body in collet bodies, collet bodies establishes on lathe chuck connection dish, are equipped with oil pocket, piston rod and hydro -cylinder end cover at collet bodies with the link that lathe chuck connection coiled, and the hydro -cylinder end cover is connected on collet bodies, and the piston rod is arranged in the oil pocket, in the oil pocket, be equipped with oilless bearing between hydro -cylinder end cover and the oil pocket, be equipped with the oil circuit in collet bodies, the oil circuit is put through with the oil pocket mutually, lateral wall at set body is equipped with the glossy chamber of elasticity, and the oil circuit is linked together with the glossy chamber of elasticity. Adopt the utility model discloses, can impel the piston rod through the cylinder to the inside gripping sleeve of the oil pressure mode body and the fixed mechanical parts who treats processing, both stable, rese