To prevent an invasion of foreign matters between slide-contact surfaces of a seal ring, to enhance an abrasion resistance property of the seal ring and to maintain a sealing performance well for a long time period.
A floating seal 22 is provided between a casing 1 at a fixed side constituting a reduction gear for traveling and a casing 3 at a rotation side. A pair of seal rings 23 constituting the floating seal 22 is disposed opposed to an inner periphery side of annular projections 1B, 4B of the casings 1, 3. The respective seal rings 23 are axially urged by an O ring 24 and axial opposed surface of the seal rings 23 slide-contacted each other. A portion positioned at a radial outer side of the opposed surfaces of the seal rings 23 is formed as a slide-contact surface 23B and a position positioned at a radial inner side is formed as a taper surface 23C. A resin ring 25 comprising a polymer material containing a lubricating oil is engaged and provided between the taper surfaces 23C of the respective seal rings 23.
UZAWA NOBUO
YAMAMOTO SHINOBU
KURIHARA TAKESHI
SHIBUKAWA SOUSHI
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