Abstract: A sealing apparatus includes: an annular reinforcement ring around an axis; and an annular elastic body part around the axis, which is attached to the reinforcement ring and is formed of an elastic body. The elastic body part has: a side lip, an intermediate lip, and a grease lip. A grease as a lubricant is applied to respective inner peripheral side surfaces of the side lip, the intermediate lip, and the grease lip. A thickener of the grease includes no urea-based thickener. In a usage state of the sealing apparatus, a cross sectional area of an inter-lip space enclosed by the side lip, the intermediate lip, and a hub ring is equal to or greater than 3.5 mm2.

Abstract: A sealing device is located between an inner member and an outer member of a rolling bearing that rotate relative to each other and is for sealing a gap between the inner member and the outer member. The inner member includes a cylindrical part and a flange expanding radially outward from the cylindrical part. The sealing device includes: a mounted part that is to be mounted on the outer member of the rolling bearing; an inner annular part extending radially inward from the mounted part; a grease lip formed of an elastic material extending from the inner annular part toward the cylindrical part of the inner member of the rolling bearing; and a side lip formed of an elastic material extending from the inner annular part toward the flange of the inner member of the rolling bearing. A contact width of the side lip to the flange is less than 0.041 mm in a case in which the sealing device is mounted on the rolling bearing.

Abstract: There are provided a sealing device and a hub bearing that can reduce torque. Pear-skin-like projections and depressions are provided on each of a sliding surface in a lip for foreign object (a side lip 121a and a middle lip 121b) and a sliding surface in a lip for grease 122. Roughness of the pear-skin-like projections and depressions provided on the sliding surface of the lip for grease 122 is larger than roughness of the pear-skin-like projections and depressions provided on the sliding surface of the lip for foreign object.

Abstract: There are provided a sealing device and a hub bearing that can reduce torque. Pear-skin-like projections and depressions are provided on each of a sliding surface in a lip for foreign object (a side lip 121a and a middle lip 121b) and a sliding surface in a lip for grease 122. Roughness of the pear-skin-like projections and depressions provided on the sliding surface of the lip for grease 122 is larger than roughness of the pear-skin-like projections and depressions provided on the sliding surface of the lip for foreign object.

Abstract: A sealing apparatus includes: an annular reinforcement ring around an axis; and an annular elastic body part around the axis, which is attached to the reinforcement ring and is formed of an elastic body. The elastic body part has: a side lip, an intermediate lip, and a grease lip. A grease as a lubricant is applied to respective inner peripheral side surfaces of the side lip, the intermediate lip, and the grease lip. A thickener of the grease includes no urea-based thickener. In a usage state of the sealing apparatus, a cross sectional area of an inter-lip space enclosed by the side lip, the intermediate lip, and a hub ring is equal to or greater than 3.5 mm2.

Abstract: The invention provides a sealing device sealing a foreign material in a machine outer side so as to prevent the foreign material from entering into a machine inner side, having an end face lip which slidably comes into contact with an end face portion of a rotation side part, and applying grease for lubrication to an inner peripheral surface of the end face lip. In the sealing device, an application amount of the grease applied to an inner peripheral surface of a leading end portion in the end face lip is set to be smaller than an application amount of the grease applied to an inner peripheral surface of a root portion in the end face lip. Accordingly, grease applied to an inner peripheral surface of an end face lip is hard to be scattered even in the case that a centrifugal force acts on the sealing device.

Abstract: A sealing device mounted in a vehicle bearing device, provided with a structure capable of releasing pressure and thus suppressing the internal pressure from increasing, in the event where the internal pressure of the bearing device increases in a sealing device having a seal lip provided toward the inner portion of the bearing device. A protrusion forms a gap between the seal lip and a mating sliding member for adjusting the internal pressure of the bearing device, provided within the range of a sliding portion of the seal lip and on a portion of the circumference of the sliding portion. The protrusion is provided as a protrusion positioned on the tip end portion of the seal lip, a rib-shaped protrusion extending in a shaft direction, and a protrusion with a size that wears out after a predetermined operation time elapses.

Abstract: A dust seal for sealing a gap between an opening and a shaft inserted through the opening includes a dust seal body in an annular shape and a bushing in an annular shape. The shaft is slidably inserted through the bushing. The dust seal body includes an attaching portion, a first accordion unit, and a second accordion unit. The first accordion unit and the second accordion unit are arranged side by side in a direction of an axis. The first accordion unit is integral with the attaching portion, is joined to the attaching portion at an outer periphery, and is fixed to the bushing at an inner periphery. The second accordion unit is fixed to the attaching portion at the outer periphery, and locked to the bushing at the inner periphery.

Abstract: A sealing device includes a side lip contacting with a surface angled to the axis. To optimize the cross sectional shape of the side lip, T1/T3 is set to not less than 0.5 and less than 0.8 and L2/L1 is set to 0.2 to 0.4, where the thickness of the lip end (5c) of the side lip (5) is T1, the thickness of the lip base (5a) is T3, the length of the lip end (5c) is L1, and the length of the lip base (5a) is L2. Further, in a sealing device which includes a side lip (5) contacting with a surface angled to the axis over its contact width, the maximum value of the surface pressure in the side lip (5) is set at the most leading end (5d) of the lip.

Abstract: A sealing device with a side lip contacting with a surface angled relative to its axis in which the cross sectional shape of the side lip is optimized. Where the thickness of the tip end (5c) of the side lip (5) is T1, the thickness of the base (5a) of the lip (5) is T3, the length of the tip end (5c) is L1, and the length of the base (5a) is L2, T1/T3 is set to be not less than 0.7 and less than 0.8 and L2/L1 is set to be not less than 0.5 and less than 0.6.