Abstract: A cylindrical portion of an annular support member has a small-diameter portion press-fitted to an inner ring of a bearing, and a large-diameter portion formed by enlarging a part of the cylindrical portion, which is closer to an inboard side than the small-diameter portion. An annular magnet member has an inner-diameter side recessed portion formed by depressing, toward an outboard side, a radially inner part of a surface, in an inboard side, of the annular magnet member, and a wraparound portion that wraps around the annular support member toward the outboard side to a stepped portion between the small-diameter portion and the large-diameter portion. An inner peripheral surface of the wraparound portion protrudes radially inward more than an inner peripheral surface of the small-diameter portion. An inner peripheral surface of the inner-diameter side recessed portion has a gate mark of an inner-diameter side disk gate.

Abstract: A manufacturing method of a slinger, includes steps of: molding an annular blank material from a dull-finished steel sheet material through sheet metal press working or the like; and burring the blank material to mold a slinger. The values of the arithmetical mean roughness Ra of faces, of a burring mold, which individually come into contact with first and second slide-contact surfaces of the slinger, are set to 0.03 ?m?Ra?0.07 ?m. A ratio of pressure application force for holding the blank material between the faces to the 0.2% proof stress of the dull-finished material, is set to 1.0 or more and 1.53 or less. A clearance for the burring mold is set to T×(0.9 to 0.7) where “T” represents the sheet thickness of the blank material.

Abstract: A side lip has an intermediate thick portion. An inner circumferential side surface of the side lip has a side surface shape of a cone. An outer circumferential side surface of the side lip includes a first outer circumferential portion having a side surface shape of a cone in which the thickness gradually increases from a small diameter side toward a large diameter side, and a second outer circumferential portion having a side surface shape of a cone or a column in which the thickness gradually decreases. A thickness T1 of a distal end portion of the side lip is 0.5 T to 0.7 T, and a thickness T2 of the intermediate thick portion is 1.2 T to 1.5 T, relative to a thickness T of a base end portion of the side lip. An angle A of the distal end portion of the side lip is 10° to 30°.

Abstract: A radial gap between an outer circumferential surface of an encoder member joined to an outward flange portion of a slinger and an inner circumferential surface of a seal body includes a first gap portion and a second gap portion closer to an inward flange portion of a core metal than the first gap portion is. The outer circumferential surface that defines the first gap portion is a cylindrical outer circumferential surface, and the radial gap in the first gap portion is substantially constant in an axial direction. The outer circumferential surface that defines the second gap portion is a conical outer circumferential surface reduced in diameter as approaching the inward flange portion of the core metal in the axial direction, and the radial gap in the second gap portion is gradually increased as approaching the inward flange portion of the core metal in the axial direction.

Abstract: A manufacturing method of a slinger, includes steps of: molding an annular blank material from a dull-finished steel sheet material through sheet metal press working or the like; and burring the blank material to mold a slinger. The values of the arithmetical mean roughness Ra of faces, of a burring mold, which individually come into contact with first and second slide-contact surfaces of the slinger, are set to 0.03 ?m?Ra?0.07 ?m. A ratio of pressure application force for holding the blank material between the faces to the 0.2% proof stress of the dull-finished material, is set to 1.0 or more and 1.53 or less. A clearance for the burring mold is set to T×(0.9 to 0.7) where “T” represents the sheet thickness of the blank material.

Abstract: A side lip has an intermediate thick portion. An inner circumferential side surface of the side lip has a side surface shape of a cone. An outer circumferential side surface of the side lip includes a first outer circumferential portion having a side surface shape of a cone in which the thickness gradually increases from a small diameter side toward a large diameter side, and a second outer circumferential portion having a side surface shape of a cone or a column in which the thickness gradually decreases. A thickness T1 of a distal end portion of the side lip is 0.5 T to 0.7 T, and a thickness T2 of the intermediate thick portion is 1.2 T to 1.5 T, relative to a thickness T of a base end portion of the side lip. An angle A of the distal end portion of the side lip is 10° to 30°.

Abstract: A rotary seal is used for a horizontal rotation axis or an inclined rotation axis, and has a slinger including a cylindrical portion and an outward flange portion, a core metal including a cylindrical portion and an inward flange portion, and a seal member including a base joined to the core metal and an axial lip brought into sliding contact with an axially inner surface of the outward flange portion. The rotary seal includes a lip wetting inhibitor located radially outward of the axial lip, in which a gap is provided between a tip end of the lip wetting inhibitor and the axially inner surface of the outward flange portion, and the tip end of the lip wetting inhibitor does not contact the axially inner surface even if the lip wetting inhibitor is applied with a water pressure and elastically deformed.

Abstract: There is provided a rotary seal having uneven surfaces formed on sliding contact surfaces of a slinger with which seal lip portions of a seal member come in contact, in which wear of the seal lip portions is reduced, resulting in increased reliability. The rotary seal 1 includes: a core metal 3; the seal member 4 having a base portion 4A joined to the core metal 3 and the seal lip portions 4B, 4C, and 4D; and the slinger 2 having the sliding contact surfaces A and B with which the seal lip portions 4B, 4C, and 4D come in contact, in which each of the sliding contact surfaces A and B is in such a surface condition that an arithmetic average roughness Ra satisfies 0.3 ?m?Ra?1.0 ?m, a skewness of roughness curve Rsk satisfies Rsk??1, and an average length of roughness curve element RSm satisfies 100 ?m?RSm, Ra, Rsk, and RSm defined by JIS B 0601:2013.

Abstract: A radial gap between an outer circumferential surface of an encoder member joined to an outward flange portion of a slinger and an inner circumferential surface of a seal body includes a first gap portion and a second gap portion closer to an inward flange portion of a core metal than the first gap portion is. The outer circumferential surface that defines the first gap portion is a cylindrical outer circumferential surface, and the radial gap in the first gap portion is substantially constant in an axial direction. The outer circumferential surface that defines the second gap portion is a conical outer circumferential surface reduced in diameter as approaching the inward flange portion of the core metal in the axial direction, and the radial gap in the second gap portion is gradually increased as approaching the inward flange portion of the core metal in the axial direction.

Abstract: A plated coating of metal having a higher ionization tendency than iron is provided on at least either one of: (i) a metal fitting portion between a sleeve of a stainless steel-made slinger of a rotary seal and an inner ring that is a steel-made radially inner member; and (ii) an outside air side surface of the slinger, which includes an outside air side end portion of the metal fitting portion. Even when the solution containing the electrolyte is present on an outside air side of the fitting portion, the plated coating of metal having a higher ionization tendency than iron corrodes first instead of the inner ring that is a steel-made member. Without lowering durability and reliability, a progress of corrosion of a steel-made member is delayed even when a solution containing an electrolyte is present around a contact portion between a stainless steel-made member and a steel-made member.

Abstract: A rotary seal is used for a horizontal rotation axis or an inclined rotation axis, and has a slinger including a cylindrical portion and an outward flange portion, a core metal including a cylindrical portion and an inward flange portion, and a seal member including a base joined to the core metal and an axial lip brought into sliding contact with an axially inner surface of the outward flange portion. The rotary seal includes a lip wetting inhibitor located radially outward of the axial lip, in which a gap is provided between a tip end of the lip wetting inhibitor and the axially inner surface of the outward flange portion, and the tip end of the lip wetting inhibitor does not contact the axially inner surface even if the lip wetting inhibitor is applied with a water pressure and elastically deformed.

Abstract: There is provided a rotary seal capable of delaying a progress of corrosion of a steel-made member without increasing manufacturing cost even when a solution containing an electrolyte is present around a contact portion between a stainless steel-made member and the steel-made member. At least one of (i) a metal fitting portion A between a sleeve 2A of a stainless steel-made slinger 2 of a rotary seal 1A and an inner ring 12 that is a steel-made radially inner member, and (ii) an outside-air side surface of the slinger 2, which includes an outside-air side end portion of the fitting portion A, is provided with at least one of a silane-based adhesive layer containing powder of metal having a higher ionization tendency than iron, a thermosetting resin adhesive layer containing powder of metal having a higher ionization tendency than iron, and a coating film containing powder of metal having a higher ionization tendency than iron.

Abstract: There is provided a rotary seal having uneven surfaces formed on sliding contact surfaces of a slinger with which seal lip portions of a seal member come in contact, in which wear of the seal lip portions is reduced, resulting in increased reliability. The rotary seal 1 includes: a core metal 3; the seal member 4 having a base portion 4A joined to the core metal 3 and the seal lip portions 4B, 4C, and 4D; and the slinger 2 having the sliding contact surfaces A and B with which the seal lip portions 4B, 4C, and 4D come in contact, in which each of the sliding contact surfaces A and B is in such a surface condition that an arithmetic average roughness Ra satisfies 0.3 ?m?Ra?1.0 ?m, a skewness of roughness curve Rsk satisfies Rsk??1, and an average length of roughness curve element RSm satisfies 100 ?m?RSm, Ra, Rsk, and RSm defined by JIS B 0601:2013.