PROBLEM TO BE SOLVED: To provide a tilling claw in which soil crushing properties and abrasion resistance are improved in comparison with a current tilling claw.SOLUTION: A tilling claw of the present invention is mounted to a mounting flange of a rotational claw shaft, and tills the soil by rotating the mounting flange centering on a shaft core of the rotational claw shaft. The tilling claw comprises a vertical blade part and a horizontal blade part smoothly extended from the vertical blade part after a folding start line. The vertical blade part has two or more insertion holes for inserting fastening members and mounting the mounting flange, and forms a plane perpendicular to the shaft core. The horizontal blade part has a curved part gently curved in the vertical direction to the plane where the vertical blade part belongs. A cutting edge part is provided in a positive rotation direction side from the vertical blade part to the horizontal blade part of the tilling claw. A cutting edge angle being a complementary angle of the angle formed by a tangential line in any one point of a curve formed by the cutting edge part and a straight line for connecting one point of the cutting edge part and the shaft core decreases from an intersection point with a folding start line to a blade edge being an end of the horizontal blade part. The cutting edge angle in the vicinity of the blade edge is 50% or more and 60% or less of the cutting edge angle in the intersection point with the folding start line becomes.SELECTED DRAWING: Figure 2【課題】現行の耕耘爪に比べて砕土性及び摩耗耐性が向上した耕耘爪を提供する。【解決手段】。本発明による耕耘爪は、回転爪軸の取付フランジに取り付けられ、回転爪軸の軸芯を中心として取付フランジを回転させることで土壌を耕耘する耕耘爪であって、縦刃部と、縦刃部から折曲開始線を境に滑らかに延長される横刃部とを具備し、縦刃部は、締結部材を挿入して取付フランジに取り付けるための複数の挿通孔を有し、軸芯に対して垂直な平面を成し、横刃部は、縦刃部が属する平面に対する垂直方向へ緩やかに湾曲する湾曲部を有し、耕耘爪の縦刃部から横刃部にかけて正回転方向側に刃縁部を有し、刃縁部の成す曲線の任意の一点における接線と、刃縁部の当該一点及び軸芯を結ぶ直線との成す角の余角である切込角が、折曲開始線との交点から横刃部の端部である刃先にかけて減少し、刃先近傍における切込角は前記折曲開始線との交点における切込角の５０％以上６０％以下となることを特徴とする。【選択図】図２
