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.

On a facing surface (12a) of a pad (12) that faces a rotation shaft, an oil supply unit (24) is provided in an end region downstream of the rotation shaft in the rotation direction, and the oil supply unit (24) is formed along part of an isopleth of the pressure distribution on the facing surface (12a) generated by a lubricant being caught between the rotation shaft and the facing surface (12a), said part of the isopleth being downstream, in the rotation direction, of the pressure maximum of the pressure distribution.

According to one embodiment, a sliding bearing unit includes a stationary shaft including a first radial bearing surface, a rotor, and a lubricant. The rotor includes a first cylinder and a second cylinder. The second cylinder includes a second radial bearing surface and is restricted in operation so that it does not rotate relative to the first cylinder. The lubricant, together with the first radial bearing surface and the second radial bearing surface, forms a dynamic pressure radial sliding bearing.

The present invention relates to a high pressure nozzle (1), comprising a longitudinal housing (11, 12), with an internal channel (15) therein, a nozzle head support shaft (20), which is rotatably arranged partially in the internal channel (15), a rotary nozzle head (30), which is attached to the nozzle head support shaft (20) and arranged outside the housing (11, 12), and an axial bearing seat (40), which is located within the housing (11, 12) and which comprises an axial bearing surface (41) that faces an end surface (22) of he nozzle head support shaft (20). The axial bearing surface (41) and the support shaft end surface (22), during use, cooperate to form an axial bearing for the nozzle head support shaft (20) and the axial bearing seat (40) comprises an axial bore (42) in the axial bearing surface that is aligned concentrically with an axis of rotation of the nozzle.

A dynamic pressure bearing structure with double beveled edges is provided. The dynamic pressure bearing structure includes a bearing body, a shaft hole, and at least one oil guiding groove group. The shaft hole is disposed inside the bearing body and passes through two ends of the bearing body. The oil guiding groove group is arranged on an inner wall of the shaft hole. Two beveled edge portions are disposed on outer walls of the bearing body and forms an air escape structure. An outer diameter of the bearing body, an inner diameter of the shaft hole, and a height of the bearing body form an optimized size, with a thinnest position having a thickness being greater than or equal to 0.01 mm. The dynamic pressure bearing structure is manufactured using a metal cutting process or a powder metallurgy process.

A bearing device includes a rotary part which is configured to be rotatable about a rotational axis and has a rotary surface intersecting the rotational axis, and a stationary part which has a stationary surface facing the rotary surface. One of the rotary surface or the stationary surface includes a bearing surface part for forming a bearing oil film. The rotary surface includes a first inner circumferential region, and a first outer circumferential region facing the stationary surface on a radially outer side of the bearing surface part and having higher oleophobicity than the first inner circumferential region.

Provided is a fluid dynamic bearing device, including: a shaft member; a bearing sleeve (18) having the shaft member inserted along an inner periphery thereof; and dynamic pressure generating grooves (26) configured to support the shaft member in a relatively rotatable and non-contact manner with pressure of an oil film formed in a radial bearing gap defined between an outer peripheral surface of the shaft member and an inner peripheral surface (24) of the bearing sleeve (18). The dynamic pressure generating grooves (26) include: the large number of polygonal hill portions (27) arranged in a pattern on the inner peripheral surface (24) of the bearing sleeve (18) ; and polygonal groove portions (28) formed in such a manner as to surround the polygonal hill portions (27).

A crankshaft bearing structure is provided capable of properly lubricating a thrust bearing even when low-viscosity oil is used in an engine. The crankshaft bearing structure includes a crankshaft, a cylinder block, plural journal bearings, and thrust bearings. Each of the plural journal bearings is annularly attached to a respective one of plural crank journals when the crankshaft is rotating. The thrust bearings are attached to a shaft support section, which supports the crank journal, in the cylinder block, to restrict movement of the crankshaft in a direction along an axis. The upper journal bearing annularly attached to the crank journal has a circumferential groove provided in an inner circumferential surface, connected to an oil hole, and extending in a circumferential direction.

A hydrodynamic bearing includes a main body. The main body has an inner hole. The inner hole includes a first space and a second space at either end of the first space. An inner wall of the second space is formed with 9-16 hydrodynamic grooves. The hydrodynamic grooves each have a V shape and are arranged at equal intervals. The hydrodynamic grooves each have a bend angle of 30°-50°. The hydrodynamic bearing effectively improves the pressure generating effect of the product and enhances the rotation accuracy of a rotary shaft, meeting the needs of customers.

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.