Embodiments disclosed herein relate to bearing assemblies and methods of manufacturing. In an embodiment, a bearing assembly includes a support ring and bearing elements. The bearing elements are mounted to and distributed circumferentially about an axis of the support ring. At least one of the bearing elements includes a polycrystalline diamond table, a substrate bonded to the polycrystalline diamond table, bonding region defined by the substrate and the polycrystalline diamond table, and a corrosion resistant region. The corrosion resistant region includes a corrosion resistant material that covers at least a portion of at least one lateral surface of the bonding region. The corrosion resistant region prevents corrosion of at least some material in the bonding region covered by the corrosion resistant region (e.g., during use). Other embodiments employ one or more sacrificial anodes as an alternative to or in combination with the corrosion resistant region.

The present disclosure is directed to a detachable connection between a pitch control unit arm and a pitch horn of a blade holder in a tail rotor head of a tail rotor of a rotary wing aircraft. The detachable connection includes a pin connecting the pitch horn, attached to a blade holder, with the pitch control unit arm of a pitch control unit, by protruding through an arm through hole and at another edge through a pitch horn through hole. By this arrangement, material wear is reduced and maintenance intervals can be reduced. This is reached because the pin is designed as a sliding pin projecting between pitch horn and pitch control unit arm, which is running in the course of its length through a spherical bearing in form of a ball with a central ball through hole.

A bearing inner race for a solar panel tracker positioning system includes a semi-circular shaped body having a first upper land and an oppositely facing second upper land. A first elongated aperture is positioned proximate to the first upper land and a second elongated aperture is positioned proximate to the second upper land. A first alignment ring is centered within the first elongated through aperture and a second alignment ring is centered within the second elongated through aperture. The bearing inner race also includes a ground stud integrally connected to the body in an as-cast condition of the body.

In an embodiment, a protective leaching cup may include a base portion, at least one sidewall defining an opening general opposite the base portion, and a receiving space in communication with the opening and at least partially defined by the base portion and the sidewall. The receiving space is sized and configured to receive at least a portion of the superabrasive element. A seal contact portion is located on an inner surface of the sidewall. The seal contact portion is configured to form a seal against the superabrasive element that is at least partially impermeable to fluid(s). At least one of the seal contact portion or the sidewall includes material(s) exhibiting a flexural modulus greater than about 150,000 psi at room temperature.

A plain bearing assembly of a rotational element on a bearing pin, the assembly including a bearing bolt, a bearing sleeve, which is non-rotatably mounted on the pin and which has a first bearing surface formed on its outer circumference, a rotational element which is rotatably mounted on the bearing sleeve and which has a second bearing surface that is formed on its inner circumference and that is slidingly mounted on the first bearing surface. The bearing pin has at least one lubricant channel opening onto the outer side of the pin and the bearing sleeve has a radial groove formed on its inner circumference, which groove communicates with the radial lubricant channel, and at least one opening branching off radially from the radial groove and opening towards the rotational element. The rotational element has a radial groove formed on its inner circumference and communicating with the opening and the first bearing surface is harder than the second bearing surface.

A thrust bearing pad includes a relatively low wear and low friction contact layer disposed on a metallic substrate. The metallic substrate allows a manufacturer to couple the thrust bearing pad to a corresponding metallic thrust bearing in a relatively secure manner while the contact layer extends the operating life of the thrust bearing and minimizes maintenance.

Bearing assemblies, apparatuses, systems, and methods include bearing assemblies having one or more bearing element in a bearing housing for supporting a shaft extending through at least a portion of the bearing housing. The bearing assembly including a recirculation line for delivering fluid into the bearing housing at a location separate from a fluid inlet of the bearing housing to at least partially thermally regulate, lubricate, and/or flush the one or more bearing elements during operation of the shaft.

A lubricating oil composition according to the present embodiment is a lubricating oil composition to be used in a sliding member coated with hydrogen-containing diamond-like carbon, and contains a base oil and a friction modifier. The friction modifier contains a fatty acid ester of pentaerythritol.

A sliding member includes a carbon transfer layer and can superiorly effectively decrease friction and reduce wear. A method produces the sliding member. The sliding member includes a substrate and a carbon transfer layer. The carbon transfer layer is disposed on the surface of the substrate and includes both sp.sup.2 bonded carbon and sp.sup.3 bonded carbon. The carbon transfer layer preferably has a ratio sp.sup.3/(sp.sup.2+sp.sup.3) of the sp.sup.3 bonded carbon to the totality of the sp.sup.2 bonded carbon and the sp.sup.3 bonded carbon of 0.1 or more.

Among other things, a bearing assembly comprising a hybrid coating is provided. A bearing assembly may comprise a substrate having a surface and a hybrid wear resistant coating over the surface of the substrate. In an example, the substrate may be an inner radial bearing and/or and outer radial bearing within a bearing assembly. The hybrid wear resistant coating may comprise a high wear resistant coating and a low wear resistant coating. The high wear resistant coating may comprise a wear resistant matrix over the surface and a set of wear resistant elements within the wear resistant matrix. In an example, wear elements within the set of wear elements may comprise tungsten carbide. The low wear resistant coating may be over a low wear area of the surface. In an example, the low wear resistant coating may be positioned between the first high wear resistant coating and a second high wear resistant coating.