A bearing structure for an X-ray tube is provided that includes a journal bearing shaft with a radially protruding thrust bearing encased within a bearing sleeve, one of which rotates relative to the other. The stationary component, e.g., the journal bearing and/or the thrust bearing includes at least one vent groove formed therein that improves the ability of the journal bearing structure to enable gases trapped by the liquid metal within the bearing assembly to escape through the vent groove to the exterior of the X-ray tube. By adding a strategically located channel or vent groove of sufficient size in at least one of the journal bearing or the thrust bearing, the pressures resisted by the seal created between the liquid metal and the vent groove(s) in the bearing components is significantly reduced, allowing escape of the gases to avoid detrimental effects to the operation of the X-ray tube, while maintaining the load carrying capacity of the bearing assembly.

A hydrodynamic bearing structure is provided. The hydrodynamic bearing structure includes a bearing body, a shaft hole, at least one oil guide groove assembly, at least one air escape unit, and a recess. The shaft hole is formed in the bearing body and penetrates through the bearing body to two ends of the bearing body. The oil guide groove assembly is formed on an inner wall of the shaft hole. The air escape unit is disposed on an outer wall of the bearing body, and has a groove or a tangent plane. The recess is formed at one of the two ends (e.g., a bottom end or a top end) of the bearing body. The recess is spatially communicated with the air escape unit so that an exhaust passage is formed between an axis of the bearing structure and the air escape unit.

A plain shaft bearing, in particular of a shaft of a wind turbine gearbox, includes a sliding surface having a surface roughness. The sliding surface is further provided with a structure formed from depressions defined by a depth which is greater than the surface roughness and less than 80 μm.

A sliding component includes at least one of a pair of sliding members and provided with: a group of recessed portions including a plurality of recessed portions formed in a sliding surface of the sliding member; and a plurality of hollow portions formed inside the sliding member and out of alignment with the recessed portions in a thickness direction of the sliding member. The sliding member is further provided with the hollow portions disposed so as to generate at least part of a new group of recessed portions until the sliding member is worn by the thickness of deepest one of the recessed portions.

A pair of sliding members sliding relative to each other at sliding faces is configured such that at least one of the sliding faces (S) includes a negative pressure generation mechanism (41) surrounded by a land portion and a branched portion (42) arranged in the sliding face S and branched from the negative pressure generation mechanism (41). The sliding members can be formed compact and is applicable to equipment for rotation in both directions, while sliding torque reduction and sealing function improvement can be realized.

A bearing system includes a first bearing, a second bearing, and a rotating member. The first bearing is hollow and has a first inner face. The second bearing is located in the first bearing. The second bearing includes a second inner face axially aligned with the first inner face. A partitioning space is formed between the first inner face and the second inner face. The rotating member has a shaft and a protruding portion coupled to the shaft. The protruding portion is located in the partitioning space. A dynamic pressure gap is formed between the protruding portion and the first inner face during rotation. Another dynamic pressure gap is formed between the protruding portion and the second inner face during rotation.

In an embodiment, a method of fabricating a polycrystalline diamond compact is disclosed. The method includes sintering a plurality of diamond particles in the presence of a metal-solvent catalyst to form a polycrystalline diamond body; leaching the polycrystalline diamond body to at least partially remove the metal-solvent catalyst therefrom, thereby forming an at least partially leached polycrystalline diamond body; and subjecting an assembly of the at least partially leached polycrystalline diamond body and a cemented carbide substrate to a high-pressure/high-temperature process at a pressure to infiltrate the at least partially leached polycrystalline diamond body with an infiltrant. The pressure of the high-pressure/high-temperature process is less than that employed in the act of sintering of the plurality of diamond particles.

A pair of sliding parts has sliding faces S that slide with respect to each other in which at least the sliding face S on one side includes dimple groups 20 formed by arranging plural dimples 10, and the dimples 10 are arranged in such a manner that a radial-direction coordinate average of center coordinates of the dimples 10 of the dimple group 20 is smaller than a sliding radius Rm of the sliding face S. The sliding parts can improve a characteristic of suctioning from the leakage side to sliding faces, thereby providing excellent sealing property.

Systems and methods related to hydrodynamic bearings are provided. One example system includes a hydrodynamic bearing including a rotational component configured to attach to an anode and a stationary component. The stationary component includes a bearing surface having a plurality of grooves configured to generate pressure in a fluid interface during rotation of the rotational component and where the bearing surface includes at least one recessed section profiled based on an expected pattern of wear.

A sliding component is provided. At least one sliding face of sliding faces sliding relatively to each other of a pair of sliding parts of annular shapes is provided with positive pressure generation mechanisms with positive pressure generation grooves and negative pressure generation mechanisms with negative pressure generation grooves. The positive pressure generation grooves and the negative pressure generation grooves are separated from the opposite-to-sealed-fluid side by a land. Deep grooves deeper than the groove depth of the positive pressure generation grooves and the negative pressure generation grooves are located at least on the opposite-to-sealed-fluid side of the positive pressure generation grooves and the negative pressure generation grooves. The deep grooves are provided in such a manner as to communicate at least with the sealed fluid side.