A rotating device and a vacuum pump are provided, having a structure in which a refrigerant or the like does not leak out to an inside and which can sufficiently cool a rotating body, obtain high reliability, and realize cost reduction. The structure is constituted to include: a casing; a rotating body including a rotating shaft disposed rotatably relative to the casing, the rotating body constituted integrally with the rotating shaft; a hollow part formed along a center of the rotating shaft in the rotating body; and a cooling rod which is fixed to the casing and provided in a state of non-contact with the rotating body in the hollow part without having a mechanism for injecting a refrigerant, and which absorbs a radiation heat of the rotating body to cool the rotating body.

A rotating device and a vacuum pump are provided, having a structure in which a refrigerant or the like does not leak out to an inside and which can sufficiently cool a rotating body, obtain high reliability, and realize cost reduction. The structure is constituted to include: a casing; a rotating body including a rotating shaft disposed rotatably relative to the casing, the rotating body constituted integrally with the rotating shaft; a hollow part formed along a center of the rotating shaft in the rotating body; and a cooling rod which is fixed to the casing and provided in a state of non-contact with the rotating body in the hollow part without having a mechanism for injecting a refrigerant, and which absorbs a radiation heat of the rotating body to cool the rotating body.

A rotational component includes a monolithic compressor component for rotation about a rotor axis defining proximal and distal directions, the monolithic compressor component including a compressor shaft defining a rotor core and a compressor wheel disposed distally from the rotor core.

A rotational component includes a monolithic compressor component for rotation about a rotor axis defining proximal and distal directions, the monolithic compressor component including a compressor shaft defining a rotor core and a compressor wheel disposed distally from the rotor core.

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. When a virtual line extending vertically downward from a rotational center CL of the rotational shaft is defined as a reference line VL in a state where an oil discharge port is orientated downward, the lubricant oil guide member extends from the reference line VL along the circumference direction toward each of one side and another side of the reference line VL over a predetermined angle θ about the rotational center CL of the rotational shaft.

A product may include a bearing housing in which a shaft may be supported by a bearing so that it may rotate. A compressor wheel may be disposed on the shaft. A compressor cover may be connected with the bearing housing, which may form a compressor body and may define a chamber within which the compressor wheel may rotate. A diffuser may extend radially outward from the chamber and may receive gas from the compressor wheel. An inlet may be provided to the compressor body, which may receive a supply of exhaust gas. An EGR distribution cavity may be defined within the compressor body and may extend around the shaft. An EGR inlet channel may extend into the bearing housing from the inlet to the EGR distribution cavity. An EGR passage may extend from the EGR distribution cavity to the diffuser.

A product may include a bearing housing in which a shaft may be supported by a bearing so that it may rotate. A compressor wheel may be disposed on the shaft. A compressor cover may be connected with the bearing housing, which may form a compressor body and may define a chamber within which the compressor wheel may rotate. A diffuser may extend radially outward from the chamber and may receive gas from the compressor wheel. An inlet may be provided to the compressor body, which may receive a supply of exhaust gas. An EGR distribution cavity may be defined within the compressor body and may extend around the shaft. An EGR inlet channel may extend into the bearing housing from the inlet to the EGR distribution cavity. An EGR passage may extend from the EGR distribution cavity to the diffuser.

Rotor structure for a turbomachine, such as a centrifugal compressor is provided. Disclosed embodiments make use of venting/sealing arrangements effective for venting a tie bolt rotor so that, for example, an incipient leakage of a process fluid can be monitored. Additionally, in operation disclosed embodiments are effective to, for example, convey to the tie bolt a pressurized sealing fluid effective for reducing the likelihood of process fluid escaping to the atmosphere.

A turbofan engine includes a propulsor section that has a propulsor shaft in driving engagement with a propulsor. An epicyclic gear system has a gear mesh lateral stiffness and a gear mesh transverse stiffness. A gear system input defines a gear system input lateral stiffness and a gear system input transverse stiffness. The gear system input lateral stiffness is less than 5% of the gear mesh lateral stiffness. A first turbine section rotates at a first speed, and a second turbine rotates at a second speed that is faster than the first speed. A first performance quantity is defined as the product of the first speed squared and the first area of the first turbine, a second performance quantity is defined as the product of the second speed squared and the second area of the second turbine, and a performance quantity ratio is between 0.5 and 1.5.

The invention relates to a rotor (4) for an air supply unit (1) of a fuel cell unit, which rotor is to be rotatably mounted in a housing (5) of the air supply unit (1) by means of foil-air bearings (15, 16). According to the invention, at least portions of the rotor (4) are formed of a carbon graphite material or of a synthetic-resin-bonded carbon fiber material or coated therewith. The invention also relates to an air supply unit (1) having a rotor (4) of this type.