Abstract: A flange part of an inner ring member (11) used in a roller bearing has a thin-wall part (13) having a relatively small diameter direction thickness on its end face side, and a thick-wall part (14) having a relatively large diameter direction thickness on its center side, and an inner diameter surface has a contact part (15) fitted to a shaft at its center part, a non-contact part (16) apart from the shaft in a diameter direction at its outer edge, and a ridge line part (17) positioned on the boundary between the contact part (15) and the non-contact part (16). The axial direction width L1 of the thin-wall part (13) from an end face (12) of the inner ring member (11) and the axial direction distance L2 between the end face (12) and a ridge line part (17) of the inner ring member (11) have a relation of L1>L2.

Abstract: A flange part of an inner ring member (11) used in a roller bearing has a thin-wall part (13) having a relatively small diameter direction thickness on its end face side, and a thick-wall part (14) having a relatively large diameter direction thickness on its center side, and an inner diameter surface has a contact part (15) fitted to a shaft at its center part, a non-contact part (16) apart from the shaft in a diameter direction at its outer edge, and a ridge line part (17) positioned on the boundary between the contact part (15) and the non-contact part (16). The axial direction width L1 of the thin-wall part (13) from an end face (12) of the inner ring member (11) and the axial direction distance L2 between the end face (12) and a ridge line part (17) of the inner ring member (11) have a relation of L1>L2.

Abstract: In a contact type seal arrangement for a rolling bearing, it is aimed to reduce torque and improve sealability by improving the lip structure of each seal member. Each seal member 11 has a branch portion 15 at substantially the same height as the land 3 of the inner ring. A main lip 16 is defined by its portion extending radially inwardly from the branch portion 15. The tip of the main lip 16 is brought into contact with the outer groove wall 21 of the seal groove 4 to define a contact seal 25. An auxiliary lip 17 is defined by a portion extending axially inwardly from the branch portion 15. A labyrinth seal 19 is defined between the tip of the auxiliary lip 17 and the inner groove wall 18 of the seal groove 4.