Four-hole drilling hydraulic clamp for end face tooth middle flange

The utility model relates to a four-hole drilling hydraulic clamp for an end face tooth middle flange. The drilling jig comprises a base, a positioning plate, a hydraulic cylinder, a supporting seat,a spring, a pressing mechanism, a drilling jig plate and a drilling jig sleeve, the supporting base comprises an upper supporting base body and a lower supporting base body. The upper end face of thelower supporting base is fixedly connected with the upper supporting base through hexagon socket cap screws. The supporting upper seat moves up and down along the hexagon socket head cap screw; a dustpan-shaped groove is formed in the upper end face of the upper supporting base. The inner arc radius of the dustpan-shaped groove is the same as the outer circle radius of the small end of the end face tooth middle flange; the middle of the drill plate is provided with a spline mandrel which faces downwards and is matched with an internal spline of the end face tooth middle flange; the location degree of the center lines o