DOUBLE-ROW TAPERED ROLLER BEARING

To provide a double-row tapered roller bearing which equalizes applied loads in double rows, and obtains a long life as a whole bearing under a load condition in which an axial load mainly acts from one direction due to the optimization of a contact angle, and an axial load may act in a reverse direction.SOLUTION: This bearing is a front-face combination double-row tapered roller bearing. A contact angle θA of an applied load row A of an axial load is larger than a contact angle θB of a non-load side row B. A difference between the contact angles θA, θB of both the rows A, B is equal to 15° or larger. Either of, or both a roller length and a roller diameter of a roller at the non-load side row B are longer and larger than a roller length and a roller diameter of a roller at the applied load row A. The contact angle θA of the 25°≤applied load row A may be ≤35°, and the contact angle θB of the 5°≤non-load side row B may be ≤15°.SELECTED DRAWING: Figure 1 【課題】接触角の適正化により、アキシアル荷重が主に一方向から作用し、また逆方向にアキシアル荷重が作用する場合が生じる荷重条件下で、両列の負荷荷重を均衡化し、軸受全体として長寿命化が達成できる複列円すいころ軸受を提供する。【解決手段】正面組合せの複列円すいころ軸受である。アキシアル荷重の荷重負荷列Ａの接触角θＡが、非負荷側列Ｂの接触角θＢよりも大きい。両列Ａ，Ｂの接触角θＡ，θＢの差が１５°以上である。非負荷側列Ｂのころのころ長さところ径のいずれか一方またはは両方が、荷重負荷列Ａのころのころ長さところ径よりも大きい。２５°≦荷重負荷列Ａの接触角θＡ≦３５°、でかつ、５°≦非負荷側列Ｂの接触角θＢ≦１５°であってもよい。【選択図】図１