New tooth shape for tri-cone rotary drill bit

The utility model relates to a novel tooth shape for a roller bits used by petroleum department and geology department for drilling holes. The utility model has a prismatic cutting edge which is favorable for being pressed into rocks, and the utility model can generate a 'furrow' phenomenon and has a preliminary pulverizing function. The utility model is characterized in that a trigonous body is arranged on the cutting edge of a tooth, and a cutting part on a tooth crest is in a cross shape or Y shape. Compared with the existing tooth, the utility model is easy to be pressed into the rocks, and the utility model is favorable for pulverizing the rocks in a sliding way; at the same time, the utility model has the preliminary pulverizing function, the pulverization of the rocks is accelerated, and the speed of drilling a well is improved.