PROBLEM TO BE SOLVED: To provide a tillage tine improving turning properties while suppressing an increase in vibration or horsepower consumption.SOLUTION: The tillage tine has a base part 3 mounted on a tine shaft 2, a straight-blade part 4 extending from the base part 3, and a curved part 5 extending from the straight-blade part 4. A curve is provided from the straight-blade part 4 to the curved part 5 in the direction opposite to the rotative direction A, and the curved part 5 is bent into a curved state from one lateral surface of the base part 3 to the side of the other lateral surface. The tillage tine has a blade part 6 on the front side in the rotative direction A ranging from the straight-blade part 4 to the curved part 5. In the tillage tine, the tine height 8 which is a distance along the tine shaft 2 from the one lateral surface of the base part 3 to the front end 11 in the curved direction of the curved part 5 is about 70 mm, and the front bending R9 which is the bending radius of the curved part 5 is about 80 mm. The cutting angle 10 which is an angle between a line E intersecting a line D connecting the front end C of the blade edge 6a of the blade part 6 to the axis O of the tine shaft at right angles, and extending from the front end C to the side opposite to the rotative direction A, and a line F parallel to a bending starting line B of the curved part 5, and extending from the front end C to the side of a peak 12 of the tillage tine is about 37°.COPYRIGHT: (C)2010,JPO&INPIT【課題】 振動・消費馬力の増大を抑えつつ反転性を向上させることができる耕耘爪を提供する。【解決手段】 爪軸2に取り付けられる基部3と、基部3から延びる直刃部4と、直刃部4から延びる湾曲部5とを有し、直刃部4から湾曲部5にかけて回転方向Aと逆向きに湾曲されていると共に湾曲部5は基部3の一側面から他側面側へと湾曲状に曲げられており、直刃部4から湾曲部5にかけて回転方向A前側に刃部6を有する耕耘爪において、基部3の一側面から湾曲部5の湾曲方向先端部11までの爪軸2に沿った距離である爪高さ8を略70mmとし、湾曲部5の曲げ半径である先曲げR9を略80mmとし、刃部6の刃縁6aの先端部Cと爪軸軸芯Oとを結ぶ線Dに直交し且つ前記先端部Cから前記回転方向Aと逆側に延びる線Eと、湾曲部5の折れ曲がり開始線Bと平行で且つ前記先端部Cから耕耘爪の峰12側に延びる線Fとのなす角度である切削角10を略37°とする。【選択図】図1
