An apparatus is provided that includes a diamond bearing surface positioned in sliding engagement with an opposing bearing surface of a diamond reactive material. The opposing bearing surface is hardened via a material treatment.

A hub seal seals a gap between an outer race member and an inner race member of a hub bearing. The hub seal includes: an annular base; and a seal member attached to the base and including an annular elastic material. The seal member includes a side lip extending toward an outer side and an intermediate lip extending toward the outer side on an inner periphery side relative to the side lip. A sliding surface of the side lip that comes into contact to seal the gap between the outer race member and the inner race member is rougher than a sliding surface of the intermediate lip that comes into contact to seal the gap between the outer race member and the inner race member.

A sliding member having a supporting layer composed of an iron-based metallic material and a sliding layer formed on a surface of the supporting layer and composed of a copper-based metallic material. The surface of the supporting layer and the sliding layer have non-flat surfaces. A sliding surface having a non-flat surface is formed on the surface of the sliding layer. The sliding layer is formed on the roughened surface of the supporting layer by thermal spraying. The surface of the sliding layer is then subjected to a shot blasting treatment to form the sliding surface which has an uneven surface having an arithmetic average roughness (Ra) of more than 0 m and 2.0 m or less, a ten-point average roughness (Rz) of more than 0 m and 7.5 m or less and a surface hardness (Hv) of 150-250, and which slidably supports an object to be slid.

A problem is to provide a sliding member capable of easily improving friction characteristics, and a production method therefor. A solution is a sliding member 10, wherein a sliding portion 11 is formed of a metallic material, and the sliding member 10 has, on a surface of the sliding portion 11, a Cr-containing modified layer 12 formed by blasting a shot media containing Cr as a composition. The sliding member 10 slides under an environment of a lubricant containing Mo as an additive, in which active Cr exposed on the surface by sliding accelerates decomposition reaction of the additive contained in the lubricant to form a molybdenum disulfide-containing film having low friction on the surface of the sliding portion 11.

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.

To provide a sliding member which has hardness that is suitable for the circumstance, to which heavy load is applied, and which is excellent in abrasion resistance property. The sliding member contains a sliding layer for slidably supporting a body to be slid, shot blasting being performed on a surface of the sliding layer, and a sliding surface formed on a surface of the sliding layer, the sliding surface having an uneven configuration with arithmetic mean roughness (Ra) of 1.0 m through 2.5 m, 10-point average roughness (Rz) of 5.0 m through 10.0 m, and surface hardness (Hv) of 220 through 250.

At a position of a depth of the first predetermined value from the surface of the gear portion, a surface treatment that satisfies a range of a required hardness defined in advance of the gear portion is performed. A surface treatment is performed at a depth of a second predetermined value from a surface of a bearing portion, the surface treatment satisfying a required hardness in a range prescribed in advance for the bearing portion. Since the second predetermined value is deeper than the first predetermined value, the hardness distribution is made different between the gear portion and the bearing portion. The required hardness in the gear portion and the required hardness in the bearing portion are respectively satisfied.

A rolling bearing includes an inner ring, an outer ring, and rolling elements interposed between the inner ring and the outer ring. A surface layer portion, beneath a raceway surface (10a), of a base material of a raceway ring (10) which is the inner ring or the outer ring, is a wear-resistant layer (13) which has a higher hardness than a residual portion (12), beneath the surface layer portion, of the base material, and includes a minute-recess-and-projection surface. An oxide film (14) is provided which has such a film thickness (t) as to fill recesses of the minute-recess-and-projection surface of the wear-resistant layer (13), and includes recesses and projections existing along the minute-recess-and-projection surface, and the oxide film (14) coats the surface of the wear-resistant layer (13). The oxide film (14) is made from a material more fragile than the wear-resistant layer (13) of the base material.

Annular joint surfaces of a lower case of a strut bearing device respectively have case-side projections that project in an axial direction. Shapes A of the case-side projections, seen in an axial direction, continue in a circumferential direction, and vary their position in a radial direction along the circumferential direction. An inner-diameter side seal has a seal-side recess fitted to the case-side projection. An outer-diameter side seal has a seal-side recess fitted to the case-side projection.

The invention relates to a method for producing a multi-layer plain bearing element with a first layer made from a metal having an inner face, whereby this inner face is cleaned by scanning the entire inner face by means of a laser and at least one other layer is then applied to the inner face of the first layer. The cleaning is carried out using an ultrashort pulse laser.