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Hob wheel body cooling with large diameter hard alloy, the effect is good, the bearing diameter is large, the impact strength is strong; the use of metal sealing, long service life, generally more than 200 hours or more. The main body is made of high quality alloy steel, which is made of good welding quality, and it can be used in the process of modulation and processing, and the tensile strength is high. Wheel body and the body is connected with the body, and it is convenient to assemble and disassemble, and it is not required for large special hydraulic equipment, the artificial wrench can be used to facilitate the replacement of the wheel body.