SINGLE ROW BALL BEARING

PROBLEM TO BE SOLVED: To provide a single row ball bearing capable of achieving a longer life by preventing multipoint contact between each raceway groove and each ball during high-speed rotation.SOLUTION: A single row ball bearing 10 includes an outer ring raceway groove 1a and an inner ring raceway groove 2a which have two arc surfaces 1a1, 1a2 and 2a1, 2a2 mutually different in curvature center on both sides across the width-direction centers, respectively. In the static state, balls 3 have two-point contact with the outer ring raceway groove 1a when the balls 3 are pushed against the outer ring raceway groove 1a, and the balls 3 have two-point contact with the inner ring raceway groove 2a when the balls 3 are pushed against the inner ring raceway groove 2a. The two arc surfaces 1a1, 1a2 of the outer ring raceway groove 1a have curvature radii re1, re2 equal to each other, and contact angles αe1, αe2 formed on both axial-direction sides and different from each other, respectively.SELECTED DRAWING: Figure 1 【課題】高速運転における軌道溝と玉との多点当りを防止することにより、長寿命を達成することが可能な単列玉軸受を提供する。【解決手段】単列玉軸受１０は、外輪軌道溝１ａ及び内輪軌道溝２ａは、曲率中心が互いに異なる２つの円弧面１ａ１、１ａ２、２ａ１、２ａ２を幅方向中央に対して両側にそれぞれ有し、静止状態において、玉３を外輪軌道溝１ａに押し付けたときに、玉３は外輪軌道溝１ａに２点で接触し、且つ、玉３を内輪軌道溝２ａに押し付けたときに、玉３は内輪軌道溝２ａに２点で接触する。外輪軌道溝１ａでは、２つの円弧面１ａ１，１ａ２の曲率半径ｒｅ１，ｒｅ２は互いに等しく、且つ、軸方向両側に形成される接触角αｅ１、αｅ２が互いに異なる。【選択図】図１