Seal Arrangement For a Rolling Bearing

A seal arrangement for a rolling bearing comprising circumferential seal grooves (4) formed in a radially outer surface of an inner ring (1), seal members (11) having their outer edges fixed to a radially inner surface of an outer ring (5) that faces said seal grooves (4), each of said seal members (11) having a main lip (16) and an auxiliary lip (17) provided at a radially inner portion thereof, said main lip (16) being in contact with one of said seal grooves (4) to define a contact seal (25), said auxiliary lip (17) being disposed close to said seal groove (4) or a portion near said seal groove (4) to define a labyrinth seal (19), characterized in that each of said seal members (11) having a branch portion (15) at a position offset radially inwardly by a minute amount (ΔX) from an axial extension (L) of the radially outer surface of the inner ring (1), that said main lip (16) is formed by a portion of said seal member extending radially inwardly from said branch portion (15), said main lip (16) having its tip in contact with an outer groove wall (21) of said seal groove (4) to define said contact seal (25), and that said auxiliary lip (17) is formed by a portion of the seal member extending axially inwardly from said branch portion (15) and forming a step of said minute amount (ΔX) relative to said radially outer surface of said inner ring (1), said labyrinth seal (19) being defined between the tip of said auxiliary lip (17) and an inner groove wall of said seal groove (4).

A seal arrangement for a rolling bearing comprising circumferential seal grooves (4) formed in a radially outer surface of an inner ring (1), seal members (11) having their outer edges fixed to a radially inner surface of an outer ring (5) that faces said seal grooves (4), each of said seal members (11) having a main lip (16) and an auxiliary lip (17) provided at a radially inner portion thereof, said main lip (16) being in contact with one of said seal grooves (4) to define a contact seal (25), said auxiliary lip (17) being disposed close to said seal groove (4) or a portion near said seal groove (4) to define a labyrinth seal (19), characterized in that each of said seal members (11) having a branch portion (15) at a position including an axial extension (L) of the radially outer surface of the inner ring (1), that said main lip (16) is formed by a portion of said seal member extending radially inwardly from said branch portion (15), said main lip (16) having its tip in contact with an outer groove wall (21) of said seal groove (4) to define said contact seal (25), that said main lip (16) has on its inner surface a tapered surface (28) forming an angle (β) of 90° or more relative to said outer groove wall (21), that said auxiliary lip (17) is formed by a portion of the seal member extending axially inwardly from said branch portion (15), and that said auxiliary lip (17) is formed at a height offset radially outwardly from the extension (L) of the radially outer surface of said inner ring (1), and has on its tip surface a tapered surface (27) forming an angle θ exceeding 90° relative to the radially outer surface of said inner ring (1), said labyrinth seal (19) being defined between the radially inner surface of said auxiliary lip (17) and an inner groove wall (18) of said seal groove (4).