Abstract: A gas bearing device is a gas bearing device using a gas as a working fluid, including: a rotational shaft; a housing where the rotational shaft penetrates; an annular top foil disposed inside the housing and surrounding an outer periphery of the rotational shaft; a back spring disposed between the top foil and the housing, and having a plurality of crests contacting the top foil and a plurality of valleys contacting the housing; and a pair of snap rings fitted in shaft holes where the rotational shaft of the housing penetrates, and configured to restrict movement of the back spring in an axial direction of the rotational shaft. The gas bearing device has a turning groove inclined with respect to an axis of the rotational shaft, in at least one of the pair of snap rings or in a region of the rotational shaft facing at least one of the pair of snap rings.

Abstract: A gas bearing device is a gas bearing device for rotatably supporting a rotational shaft by using a gas as a working fluid, including: a housing where the rotational shaft penetrates; an annular top foil disposed inside the housing and surrounding an outer periphery of the rotational shaft; a back spring disposed between the top foil and the housing, and having a plurality of crests contacting the top foil and a plurality of valleys contacting the housing; and a pair of snap rings fitted in shaft holes where the rotational shaft of the housing penetrates, and configured to restrict movement of the back spring in an axial direction of the rotational shaft. An inner peripheral surface of each of the pair of snap rings has self-lubricating properties.

Abstract: A thrust bearing device includes: a thrust collar fitted with a drive shaft, the thrust collar including a flange portion extending radially outward of the drive shaft; and a thrust member penetrated by the thrust collar and including a pad portion in a region facing the flange portion. The pad portion includes: a plurality of land portions which are parallel to a plane orthogonal an axis of the drive shaft and are disposed at intervals in a circumferential direction of the drive shaft; and tapered portions each of which is disposed between adjacent land portions among the plurality of land portions, joined via a step to a boundary of one land portion in the circumferential direction of the drive shaft, and joined continuously to a boundary of another land portion. Each of the land portions has a circumferential groove which is longer in the circumferential direction than in a radial direction of the drive shaft.

Abstract: A bearing device includes: a rotary shaft being rotatable around an axis; a bearing pad that supports an outer peripheral surface of the rotary shaft; a nozzle that is disposed on an upstream side of the bearing pad in a rotational direction of the rotation shaft and has a supply hole; a pair of side plates that face the outer circumferential surface of the rotation shaft on an upstream side of the nozzle in the rotational direction and are disposed on both sides of the nozzle in the axial direction, the pair of side plates having a discharge hole; and a guide surface that faces the upstream side in the rotation direction and extends in the axial direction over an entire length of the bearing pad in the axial direction, wherein the guide surface is circumferentially positioned between the supply hole and the discharge hole.

Abstract: A turbocharger is provided with: a rotational shaft; a rolling bearing rotatably supporting the rotational shaft; an oil film damper disposed radially outward of an outer ring of the rolling bearing; and a housing having a first axial retaining portion and a second axial retaining portion, disposed adjacent to both ends of the oil film damper in the axial direction, respectively, for restricting movement of the outer ring in the axial direction. An axial end surface of the outer ring, or a facing surface of the first axial retaining portion or the second axial retaining portion facing the axial end surface of the outer ring has: a coefficient of static friction smaller than that of a portion of the housing excluding the first axial retaining portion and the second axial retaining portion; or has a recess where oil of the oil film damper can enter.

Abstract: This bearing device has: a bearing pad (50) supporting an outer circumferential surface of a rotation shaft rotatably around the axis of the rotation shaft; a nozzle (80) that is disposed on the upstream side of the bearing pad (50) in a rotational direction (T) of the rotation shaft, and has a supply hole (85) for supplying lubrication oil to the outer circumferential surface of the rotation shaft; a pair of side plates (60) disposed on both sides of the nozzle (80) with respect to the axial direction and facing the outer circumferential surface of the rotation shaft on the upstream side of the nozzle (80) in the rotational direction (T), at least one of the pair having formed a discharge hole (61) penetrating through the one side plate in the axial direction; and a guide surface (86) which, at a position between the supply hole (85) and the discharge hole (61) in the circumferential direction, faces the upstream side in the rotational direction (T) and extends in the axial direction along the outer circumfe

Abstract: A tilting pad bearing including pads disposed around a rotating shaft so as to face an outer peripheral surface of the rotating shaft, liners each supporting an outside of the pad in a radial direction with an axis of the rotating shaft as a center, and pivots each supporting an outside of the liner in the radial direction with the axis as a center at a central position of the liner in an axial direction of the rotating shaft so as to allow the pad to be swingable, wherein a recessed portion recessed in a direction away from the pad is formed on a surface of the liner facing the pad or a surface of the pad facing the liner at least at the central position thereof in the axial direction of the rotating shaft.

Abstract: The present invention improves the drainability of lubricating oil at a thrust bearing. The present invention comprises: a rotating shaft; a thrust bearing that is provided to the rotating shaft and restricts the axial-direction movement of the rotating shaft; and an oil reservoir part (20) that has formed therein an oil reservoir space (20a) that is provided to be adjacent to the thrust bearing in the axial direction and to open downward, the oil reservoir space (20a) having formed therein an inclined surface (20aa) that, in a region that is in and below a horizontal plane H that passes through the center of the rotating shaft, protrudes to the thrust bearing side and is inclined along the rotational direction of the rotating shaft.

Abstract: A pad bearing includes a pad disposed on a radially outer side of a rotary shaft and supporting the rotary shaft so as to be rotatable around an axis, a block-shaped nozzle member disposed on an upstream side with respect to the pad on the radially outer side of the rotary shaft and including a discharge hole for discharging a lubricant toward an outer peripheral surface of the rotary shaft, and a compressed flow forming unit disposed in at least one of the pad and the nozzle member and configured to compress a flow of the lubricant flowing along the outer peripheral surface of the rotary shaft as the rotary shaft rotates.

Abstract: A tilting pad journal bearing manufacturing method includes a first process and a second process. In the first process, a pivot fitting hole is formed on a convex curved outer circumferential surface of the tilting pad. The pivot fitting hole is recessed from the outer circumferential surface toward an inner circumferential surface and has an inner diameter smaller than an outer diameter of the distal end portion of the pivot. In the second process, a concave portion is formed on the concave curved inner circumferential surface of the tilting pad by attaching the distal end portion of the pivot to the pivot fitting hole by interference-fitting.

Abstract: A tilting pad bearing including pads disposed around a rotating shaft so as to face an outer peripheral surface of the rotating shaft, liners each supporting an outside of the pad in a radial direction with an axis of the rotating shaft as a center, and pivots each supporting an outside of the liner in the radial direction with the axis as a center at a central position of the liner in an axial direction of the rotating shaft so as to allow the pad to be swingable, wherein a recessed portion recessed in a direction away from the pad is formed on a surface of the liner facing the pad or a surface of the pad facing the liner at least at the central position thereof in the axial direction of the rotating shaft.

Abstract: This turbocharger includes a rotating shaft extending along an axis, a turbine wheel provided at a first end portion of the rotating shaft, a compressor wheel provided at a second end portion of the rotating shaft, a housing accommodating at least a portion of the rotating shaft, bearings provided in the housing and configured to support the rotating shaft, supply flow paths supplying lubricating oil to the bearings, a discharge oil chamber formed in the housing and to which the lubricating oil is discharged from the bearings, and an oil drainage port formed below the discharge oil chamber, in which at least one of the discharge oil chamber and the oil drainage port is formed to be asymmetric between a first region and a second region defined by a vertical plane including the axis of the rotating shaft as a boundary plane.

Abstract: A rolling bearing includes an outer ring supported by a fixed body, an inner ring which supports a rotating shaft, and rolling elements between an inner groove of the outer ring and an outer groove of the inner ring, wherein a curvature radius R of at least the inner groove of the outer ring is in a range of 2r×0.53?R?2r×0.55 in relation to a radius r of one of the rolling elements.

Abstract: A turbocharger according to an embodiment of the present invention includes a rotating shaft, a compressor, a turbine, a compressor-side floating bearing and a turbine-side floating bearing that rotatably support the rotating shaft, and a bearing housing that houses the compressor-side floating bearing and the turbine-side floating bearing, the bearing housing being internally provided with a turbine-side oil feeding passage through which oil to be fed to the turbine-side floating bearing flows and a compressor-side oil feeding passage through which oil to be fed to the compressor-side floating bearing flows. A ratio of an oil feeding pressure for oil at an outlet of the compressor-side oil feeding passage to an oil feeding pressure for oil at an outlet of the turbine-side oil feeding passage is configured to be higher than 1.0 and lower than 1.5.

Abstract: A pad bearing includes a pad disposed on a radially outer side of a rotary shaft and supporting the rotary shaft so as to be rotatable around an axis, a block-shaped nozzle member disposed on an upstream side with respect to the pad on the radially outer side of the rotary shaft and including a discharge hole for discharging a lubricant toward an outer peripheral surface of the rotary shaft, and a compressed flow forming unit disposed in at least one of the pad and the nozzle member and configured to compress a flow of the lubricant flowing along the outer peripheral surface of the rotary shaft as the rotary shaft rotates.

Abstract: A tilting pad journal bearing manufacturing method includes a first process and a second process. In the first process, a pivot fitting hole is formed on a convex curved outer circumferential surface of the tilting pad. The pivot fitting hole is recessed from the outer circumferential surface toward an inner circumferential surface and has an inner diameter smaller than an outer diameter of the distal end portion of the pivot. In the second process, a concave portion is formed on the concave curved inner circumferential surface of the tilting pad by attaching the distal end portion of the pivot to the pivot fitting hole by interference-fitting.

Abstract: A rolling bearing includes an outer ring supported by a fixed body, an inner ring which supports a rotating shaft, and rolling elements between an inner groove of the outer ring and an outer groove of the inner ring, wherein a curvature radius R of at least the inner groove of the outer ring is in a range of 2r×0.53?R?2r×0.55 in relation to a radius r of one of the rolling elements.

Abstract: The present invention improves the drainability of lubricating oil at a thrust bearing. The present invention comprises: a rotating shaft; a thrust bearing that is provided to the rotating shaft and restricts the axial-direction movement of the rotating shaft; and an oil reservoir part (20) that has formed therein an oil reservoir space (20a) that is provided to be adjacent to the thrust bearing in the axial direction and to open downward, the oil reservoir space (20a) having formed therein an inclined surface (20aa) that, in a region that is in and below a horizontal plane H that passes through the center of the rotating shaft, protrudes to the thrust bearing side and is inclined along the rotational direction of the rotating shaft.

Abstract: This turbocharger includes a rotating shaft extending along an axis, a turbine wheel provided at a first end portion of the rotating shaft, a compressor wheel provided at a second end portion of the rotating shaft, a housing accommodating at least a portion of the rotating shaft, bearings provided in the housing and configured to support the rotating shaft, supply flow paths supplying lubricating oil to the bearings, a discharge oil chamber formed in the housing and to which the lubricating oil is discharged from the bearings, and an oil drainage port formed below the discharge oil chamber, in which at least one of the discharge oil chamber and the oil drainage port is formed to be asymmetric between a first region and a second region defined by a vertical plane including the axis of the rotating shaft as a boundary plane.

Abstract: A bearing device for a turbocharger according to one embodiment of the present invention includes: a rotational shaft; a journal bearing device including a compressor-side journal bearing and a turbine-side journal bearing; a bearing housing including a compressor-side bearing supporting portion, a turbine-side bearing supporting portion, and a bearing housing main body; and a lubricant oil guide member extending along a circumference direction of the rotational shaft, at an outer circumference side of at least one of the compressor-side bearing supporting portion and the turbine-side bearing supporting portion.