Hydraulic buffer

The utility model discloses a hydraulic buffer, the inner tube, intraductal spring in placing in is packed in interior intraductal hydraulic oil, connects in the check valve of spring, connects in the piston assembly of check valve, and the bearing between piston assembly and the outer tube is placed in to the outer tube of outside of tubes in the parcel, the surface of outer tube is equipped with flat helicitic texture. The utility model provides an outer tube adopts the hydraulic buffer of flattening helicitic texture, and hydraulic buffer's service failure is avoided to flattening helicitic texture be convenient for hydraulic buffer installation and atress, make the pressurized ability of hydraulic buffer outer tube bring up to 10Kg from 2Kg, make hydraulic buffer in the robot application occasion owing to the spoilage that pressure caused reduces to 2% from 8%.