WHEEL BEARING SEALING DEVICE

摘要

[Aim] Provided is a wheel bearing sealing device that sets the optimum specification based on the tension force of a radial lip in a pack seal and improves the sealing performance in low-temperature environments and muddy water environments. [Solution] The present invention comprises a seal plate (12) constituted by a seal member (15) bonded to a cored bar (14) through adhesion by vulcanization, and a slinger (13) that includes a cylindrical portion (13a) and a vertical plate portion (13b) extending outward in the radial direction. The seal member (15) includes a side lip (15b) which extends outward at an angle in the radial direction and slides against the vertical plate portion (13b) via axial-direction interference, and a radial lip that is formed in a bifurcated shape on an inner diameter side of the side lip (15b) and is constituted by a grease lip (15c) and a dust lip (15d) slide-contacting the cylindrical portion (13a) via radial-direction interference. A garter spring (17) is mounted on the dust lip (15d), and the tension force is set to be 50% or higher of the entire tension force while the tension force in a state where there is no garter spring (17) is set to be at least 3N.