Bearing

摘要

There is provided a bearing sealing device capable of substantially completely preventing a leak of grease. A taper end portion (18) of an axial extension (16) of the bearing sealing device has an opposite surface (20) and a rake face (21) that forms a specified rake angle with the opposite surface (20). The opposite surface (20) forms a narrow passage (19) between the opposite surface (20) and an outer peripheral surface (2A) of an inner ring (2). The narrow passage (19) allows air to pass easily, but it allows grease to hardly pass therethrough. Further, the axial extension (16) includes part (11A) of a core metal (11) that extends axially and has its foremost end (11A-1) located axially inside an axial outermost end (2A-1) of the outer peripheral surface (2A) of the inner ring (2). Grease moving axially outwardly on the outer peripheral surface (2A) is moved along the rake face (21) of the taper end portion (18) and then guided along a cover portion (15) of the bearing sealing device to an outer ring (1). The part (11A) of the core metal (11) prevents the axial extension (16) from being bent radially outwardly by a centrifugal force.