Abstract: A turbine housing includes: a housing body which includes a turbine housing part housing a turbine wheel, an inlet section forming an inlet flow passage for guiding exhaust gas to the turbine housing part, an outlet section forming an outlet flow passage for discharging the exhaust gas from the turbine housing part, and a waste-gate flow passage which brings the inlet flow passage and the outlet flow passage into communication so as to bypass the turbine housing part; and a sleeve disposed along an inner wall surface of the housing body forming the waste gate flow passage, at least on a downstream side of the waste-gate flow passage of the housing body with respect to a flow direction of the exhaust gas.

Abstract: A turbine housing includes: a housing body which is configured to accommodate a turbine wheel and which includes an inlet section forming an inlet flow passage for guiding exhaust gas to the turbine wheel, and an outlet section forming an outlet flow passage for discharging the exhaust gas from the turbine wheel; and at least one sleeve disposed along an inner wall surface of at least one of the inlet section or the outlet section of the housing body. The at least one sleeve includes a plurality of sections divided along a flow direction of the exhaust gas.

Abstract: A turbocharge includes: a compressor wheel; a turbine wheel configured to rotate with the compressor wheel; a turbine housing disposed so as to cover the turbine wheel; a bearing supporting a rotational shaft of the turbine wheel rotatably; and a bearing housing accommodating the bearing. One of the turbine housing or the bearing housing includes a fin portion protruding toward the other one of the turbine housing or the bearing housing so as to extend along an axial direction of the rotational shaft, and, between the turbine housing and the bearing housing, a cavity is formed on each side of the fin portion with respect to a radial direction of the rotational shaft.

Abstract: An expansion turbine including a turbine housing, a plurality of variable nozzles inside the turbine housing at intervals in a circumferential direction of the expansion turbine, the variable nozzles being configured to be rotatable about a rotation shaft, and a turbine wheel disposed rotatably inside the turbine housing, the turbine wheel including a plurality of turbine blades disposed downstream of the variable nozzles. The turbine housing has a first wall surface which faces tips of the turbine blades, and a second wall surface which faces the first wall surface across a flow path of the working fluid. A blade height of the variable nozzles at an outlet side is greater than a blade height of the turbine blades at an inlet side.

Abstract: A variable nozzle mechanism in which a nozzle mount has a first surface which has a minimum clearance in a direction of an axis with respect to a lever side facing surface in an opposing region facing the lever side facing surface in the direction of the axis, and a second surface which is disposed adjacent to the first surface in a circumferential direction of the nozzle mount and has a clearance in the direction of the axis with respect to the lever side facing surface larger than the clearance in the direction of the axis between the first surface and the lever side facing surface.

Abstract: A turbine wheel (12) is provided with: a disc (22) provided so as to be capable of rotating about a center axis (C); and a plurality of blades (23) provided to a disc surface (22f) at intervals in a circumferential direction, the blades (23) causing a gas guided in from radially outward leading edges (23f) to be expelled from trailing edges (23r) disposed on one side of each of the blades along the direction of the center axis (C). In each of the blades (23), in an area on one side along the direction of the center axis (C) including the trailing edge (23r), there is provided a concave surface (27) in which a positive-pressure surface (23p) on the rear side in a rotational direction (R) is recessed forward in the rotational direction (R), causing the gas to be dispersed entirely in the radial direction of the blade (23).

Abstract: A turbocharger (10) comprising: a rotating shaft (14); a turbine wheel (12); a turbine housing (31); a scroll flowpath (34) having gas flowing therethrough that rotates and drives the turbine wheel (12); a nozzle flowpath (35) that guides gas radially inwards from the scroll flowpath (34) and supplies gas to the turbine wheel (12); and a vane (53) that adjusts the amount of gas introduced in the nozzle flowpath (35). The vane (53) comprises a guide section (60) that guides the gas flow (F) in the turbine wheel (12) radially inwards.

Abstract: A turbocharger includes: at least two scroll passages, and a first range of the nozzle flow passage into which the exhaust gas flowing through the first scroll passage is introduced does not overlap with a second range of the nozzle flow passage into which the exhaust gas flowing through the second scroll passage is introduced, in a circumferential direction of the nozzle flow passage.

Abstract: This turbocharger (10) comprises a turbine wheel (12), a compressor wheel (13), and a scroll flowpath (34) formed in a turbine housing (31), continuing in the circumferential direction on the radially outer side of the turbine wheel (12), and having gas flowing therethrough that rotates and drives the turbine wheel (12). The scroll flowpath (34) is formed such that: an inner circumferential inside wall surface (34c) on the turbine wheel (12) side is gradually displaced radially outwards, along the direction of gas flow; and the cross-sectional area of the flowpath gradually decreases.

Abstract: A turbocharger (10A) has a back plate (41). The back plate (41) is provided with a plate section (41a) and a flange section (41c) which is formed radially outside the plate section (41a) and which is supported so as to be sandwiched between a bearing housing (16) and a turbine housing (31). The turbocharger (10A) is further provided with a flange heat shielding section (53) provided between the flange section (41c) and the bearing housing (16) and consisting of a material having lower heat conductivity than the turbine housing (31) and the back plate (41).

Abstract: A two-stage turbo system includes: a high-pressure stage turbocharger having a high-pressure stage turbine disposed in an exhaust passage of an engine; and a low-pressure stage turbocharger which includes a low-pressure stage turbine disposed downstream of the high-pressure stage turbine in the exhaust passage, and which is larger in size than the high-pressure stage turbocharger. The low-pressure stage turbine includes at least two scroll passages including a first scroll passage and a second scroll passage, which together form a scroll part for introducing exhaust gas into a nozzle flow passage of the low-pressure stage turbine. The scroll part is configured such that a first range of the nozzle flow passage into which the exhaust gas passing through the first scroll passage is introduced does not overlap with a second range of the nozzle flow passage into which the exhaust gas passing through the second scroll passage is introduced, in a circumferential direction of the nozzle flow passage.

Abstract: This turbocharger (10A) is provided with: a nozzle flow passage (35) for radially inwardly guiding gas from a scroll flow passage (34) and supplying the gas to a turbine wheel (12); and a nozzle mount (51) provided on the bearing housing (16) side of the nozzle flow passage (35). The turbocharger (10A) is further provided with: a vane (53) for adjusting the amount of introduced gas in the nozzle flow passage (35); and a heat shielding part (80) for minimizing heat transfer across the nozzle mount (51) from the turbine housing (31) side to the bearing housing (16) side.

Abstract: Suction surfaces of blades of this radial turbine each have: a leading edge side of blade tip including a leading edge and the boundary between the suction surface and the tip; and a trailing edge side of blade tip including a trailing edge and the boundary between the suction surface and the tip. The leading edge side of blade tip forms a concave curved surface which is recessed towards the side opposite to the rotation side in a radial view. The trailing edge side of blade tip forms a convex curved surface which protrudes towards the rotation side in a radial view.

Abstract: An object is to provide a sheet-metal turbine housing reinforced by a readily-manufacturable structure, the sheet-metal turbine housing also having a small thickness and improved containment performance. A sheet-metal turbine housing includes: a scroll part forming an exhaust gas channel of a scroll shape in a turbocharger for driving a turbine with exhaust gas of an engine, the scroll part comprising sheet metal; and at least one rib portion of a protrusion shape formed on an outer wall surface of the scroll part at a radially outer side of an inlet edge of a turbine blade along a circumferential direction of the scroll part, the at least one rib portion protruding either outward or inward, or both, and including a bend and bend-back structure formed on the sheet metal forming the scroll part.

Abstract: A storage tank 10A has a heat insulating material layer 14 formed on the outer side of a partition wall 12 that has a container shape. The inside of the storage tank 10A is divided into two storage spaces V1, V2. The first storage space V1 stores liquefied hydrogen LH2 and the second storage space V2 storing slush hydrogen SH2. A plurality of fins 18 are disposed on the partition plate 16 so as to promote heat transfer between the liquefied hydrogen LH2 and the slush hydrogen SH2 and to reduce the amount of evaporation gas from the liquefied hydrogen LH2. An escape pipe 20 is connected to the storage space V1, and the fuel supply pipes 24a, 24b are connected to the storage spaces V1, V2, respectively. The fuel supply pipes 24a, 24b are connected to a combustor 26 via the main fuel pipe 24.

Abstract: In a turbine rotor blade of a radial turbine, especially in a variable-geometry turbine with variable nozzles, an object is to restrict high-order resonance of the turbine rotor blade without increasing the size of a device with a simplified structure. A plurality of turbine rotor blades for a radial turbine is disposed on a hub surface. Each turbine rotor blade includes blade-thickness changing portions, at which at least a blade thickness of a cross-sectional shape at a middle portion of a blade height increases rapidly with respect to a blade thickness of a leading-edge side, at a predetermined position from a leading edge along a blade length which follows a gas flow from the leading edge to a trailing edge. The blade thickness increases to a blade thickness via the blade-thickness changing portions.

Abstract: The flow-through characteristics of twin exhaust gas scroll passages of a turbine are made equal to each other. A tongue which partitions the scroll portions into outer peripheral portions and inner peripheral portions includes a front-side tongue and a rear-side tongue that respectively close the two exhaust gas passages at the outer peripheral portion. The inner sides of the front-side tongue and the rear-side tongue, and the minimal outflow width portions of the front-side passage and the rear-side passage, respectively, are formed substantially parallel to each other at a downstream end of the outer peripheral portion.

Abstract: A turbine impeller includes: a hub portion coupled to an end of a rotational shaft; a plurality of main blades disposed at intervals on a peripheral surface of the hub portion; and a short blade disposed between two adjacent main blades among the plurality of main blades. An inter-blade flow channel is formed between the two adjacent main blades so that a fluid flows through the inter-blade flow channel from an outer side toward an inner side of the turbine impeller in a radial direction. In a meridional plane, a hub-side end of a leading edge of the short blade is disposed on an inner side, in the radial direction, of a hub-side end of a leading edge of the main blade.

Abstract: A turbine includes a housing including an inlet, an outlet, and a shroud section having a shroud surface extending between the inlet and the outlet; and a turbine impeller housed in the housing and including a hub and a plurality of blades disposed on an outer peripheral surface of the hub, each of the blades having a side edge extending along the shroud surface. The side edge of each of the blades has a side-edge upstream portion disposed on a side of the inlet, and a side-edge downstream portion disposed on a side of the outlet. The shroud surface has a shroud upstream portion disposed on the side of the inlet and extending along the side-edge upstream portion, and a shroud downstream portion disposed on the side of the outlet and extending along the side-edge downstream portion.

Abstract: An expansion turbine (10A) includes: a turbine housing (13) including a scroll section for taking in working fluid (w); a plurality of variable nozzles (36) disposed inside the turbine housing at intervals in a circumferential direction of the expansion turbine, each of the variable nozzles being configured to be rotatable about a rotation shaft (38); and a turbine wheel (24) disposed rotatably inside the turbine housing, the turbine wheel including a plurality of turbine blades disposed downstream of the variable nozzles. The turbine housing has a first wall surface (50) including a shroud section which faces tips (28a) of the turbine blades, and a second wall surface (52) which faces the first wall surface across a flow path (f) of the working fluid. A blade height of the variable nozzles at an outlet side is greater than a blade height of the turbine blades at an inlet side.