A radial bearing for transmitting a radial load, including a first radial bearing component having an inner surface defining a bore and a second radial bearing component received within the bore of the first radial bearing component and having an outer surface. The first radial bearing component includes a plurality of first component wear resistant inserts arranged and mounted on the inner surface. The second radial bearing component includes a second component wear resistant coating on at least a portion of the outer surface. The first radial bearing component and the second radial bearing component interact to transmit the radial load between the first radial bearing component and the second radial bearing component.

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.

A positive displacement pump of this disclosure includes a plain bearing comprising a composite material located between a first component that may experience an oscillating motion at low speed (or at low speed and high loads) and a second component located about the first. The pump may be a mud pump configured to circulate a drilling fluid into and out of a well bore during an oil/gas well drilling operation. The first component may be a wrist pin of a crosshead and the second component may be an end of a connecting rod. The composite material may be a bearing grade material that is self-lubricating and wet or contaminant tolerant or resistant. The composite material may include polyketone. In retrofit or new applications, the plain bearing may include a sleeve containing a liner made of the composite material. No external lubrication may be required, eliminating the need for lubricating structures.

An implementation of the constant velocity (CV) joint may include a drive shaft and a housing. The drive shaft may include a first axis and a plurality of drive shaft lugs on a circumference of the drive shaft. Each of the plurality of drive shaft lugs may include a first surface having a first arcuate cross-section curved about a second axis and a second surface having a second arcuate cross-section that is curved about a third axis. The housing may include a third surface that is configured to contact the first surface to receive a rotational force from the drive shaft. The lug may define an elongate slit along a length of the lug.

A bearing housing for a bottomhole assembly of a downhole tool includes an upper bearing housing, lower bearing housing, and a driveshaft. The upper bearing housing and lower bearing housing include a bore defining a bore longitudinal axis. The outer surface of the upper bearing housing defining a bearing housing longitudinal axis, the bearing housing longitudinal axis formed at an angle to the bore longitudinal axis. The upper bearing housing may be formed by forming a bore through an upper bearing housing blank and subsequently forming the outer surface of the upper bearing housing concentric with the bearing housing longitudinal axis.

An apparatus for use in a wellbore is disclosed that in one non-limiting embodiment includes a rotatable member, a thrust bearing coupled to the rotatable member, wherein the thrust bearing includes a bearing stack that further includes a unitary inner race member that includes a number of axially spaced inner races around an outer surface of the unitary inner race member. A set of bearing elements is placed in each inner race, and a separate outer race secures each set of bearing elements in each inner race.

A rolling bearing provides an inner ring and an outer ring concentrically about a rotation axis X-X running in an axial direction, and at least first and second axial bearings each axially disposed between the inner ring and the outer ring and each having at least one row of rolling elements, the first and second axial bearings being spaced apart from each other in the axial direction. The rolling bearing further provides only one radial bearing radially disposed between the inner ring and the outer ring and having at least one row of rolling elements. The radial bearing is disposed between an outer raceway located on the inner ring and an inner raceway located on the outer ring.

Embodiments disclosed herein are directed to bearing assemblies that include integrated lubrication, bearing apparatuses including such bearing assemblies, and related methods. For example, a lubricated bearing assembly may include a lubricant that may lubricate the bearing surface thereof during operation of the lubricated bearing assembly and/or bearing apparatus including the lubricated bearing assembly.

A rotatable bearing assembly transfers a weight of a drill string to a mud motor output shaft extending therethrough. The bearing assembly includes an outer bearing housing, an upper radial bearing assembly providing an upper radial bearing between the outer bearing housing and the output shaft, a balance piston that fluidly seals an upper end of the outer bearing housing and balances a pressure within the outer bearing housing, a lower radial bearing/seal assembly configured to both fluidly seal a lower end of the outer bearing housing and provide a lower radial bearing between the outer bearing housing and the output shaft, and a thrust bearing assembly received within the sealed interior of the outer bearing housing such that the bearing assembly initially operates in a sealed, lubricated mode and then a mud lube mode in the event of one or more seal failures. Other embodiments are also disclosed.

Embodiments of the invention related to bearing assemblies and methods of forming the bearing assemblies that include at least one superhard bearing element exhibiting a superhard bearing surface having a polished surface finish or a superhard bearing surface having a textured surface. In an embodiment, a bearing assembly includes a support ring. The bearing assembly includes at least one superhard bearing element. The at least one superhard bearing element includes a superhard bearing surface having a polished surface finished or a textured surface. The at least one superhard bearing element is secured to the support ring.