Abstract: A fuel cell system includes a motor driving a compressor that supplies air to a fuel cell, a turbine assisting the compressor, a bypass valve that opens and closes the bypass flow path, and a controller. When a required air flow rate is equal to or higher than a threshold value, the controller closes the bypass valve and controls the motor to cause the air to flow through the fuel cell at a flow rate corresponding to the required air flow rate. When the required air flow rate is lower than the threshold value, the controller opens the bypass valve to cause the air to flow through the bypass flow path and controls the motor to cause the air to flow through the fuel cell at the flow rate corresponding to the required air flow rate.

Abstract: Provided is a rotor that is long in the axial direction of the rotary shaft without increasing the ratio L/D between the length L and the inner diameter D of the permanent magnet. The permanent magnet of the rotor includes a plurality of sub-magnets that are divided in the axial direction A of the rotary shaft. The armor ring includes a plurality of sub-rings that are divided in the axial direction A. The connector is disposed on the inner periphery of a connecting part between the two sub-rings and that are adjacent in the axial direction A and is disposed between the two sub-magnets that are adjacent in the axial direction A. The sub-magnets each have a recess that is depressed in the axial direction A. The connector has protrusions that fit to the recesses of the magnet.

Abstract: The manufacturing method for a turbocharger includes: connecting a shaft-side member to an actuator while the shaft-side member is inserted into a bush; combining the shaft-side member with a valve body-side member; and fixing the shaft-side member to the valve body-side member in a state where a wastegate valve is driven by the actuator so as to close the wastegate valve, and a contact surface of the valve body is pressed against a bearing surface.

Abstract: A turbocharger includes a wastegate and a turbine housing having a wastegate port. A valve member of the wastegate includes a recess, which defines a gas receiving chamber, into which exhaust gas that has passed through the wastegate port flows when the wastegate port is closed. The inner wall surface of the recess has a guide sidewall located on the outer side of the wastegate port when the wastegate port is closed by the valve member. The guide sidewall includes an inclined surface, which is inclined to approach the center of the gas receiving chamber toward the inlet of the gas receiving chamber.

Abstract: Provided a rotating electrical machine including a rotor; a stator; and a fluid control mechanism has a first member and a second member, and is configured to create a flow of a fluid directed from one side toward the other side in an axial direction of the rotating shaft, on an outer periphery of the rotor. The first member has a portion at which the outside diameter increases gradually from the one side toward the other side, and is configured such that a shape of an outer circumferential surface is continuous with the shape of an outer circumferential surface of an end portion, in an axial direction, of the rotor. The second member is configured such that an inside diameter increases gradually from the one side toward the other side at a portion facing the portion of the first member at which the outside diameter increases gradually.

Abstract: A wastegate valve includes a swing arm, a valve body including a valve stem inserted through an insertion hole of the swing arm and a valve plate configured to close a wastegate port, a support plate being fixed to an end of the valve stem on a side opposite to the valve plate, and an elastic member biasing the valve plate in a extending direction of the valve stem. The elastic member includes a plurality of first lug portions and a plurality of second lug portions projecting from an outer peripheral edge of a connecting portion of the elastic member. The first lug portions and the second lug portions curve toward different sides in the extending direction of the valve stem.

Abstract: A fuel cell system includes: a fuel cell; a compressor; a turbine; an electric motor; a first transmission configured to change a gear ratio between the compressor and the electric motor, the first transmission being linked to the compressor rotating shaft and the motor rotating shaft; and a second transmission configured to change a gear ratio between the turbine and the electric motor, the second transmission being linked to the turbine rotating shaft and the motor rotating shaft. A gear ratio of the first transmission and a gear ratio of the second transmission are set such that a rotating speed of the electric motor is lower than a rotating speed of the compressor and a rotating speed of the turbine and such that a rotating speed of the compressor is higher than the rotating speed of the turbine.

Abstract: Provided is a rotor that is long in the axial direction of the rotary shaft without increasing the ratio L/D between the length L and the inner diameter D of the permanent magnet. The permanent magnet of the rotor includes a plurality of sub-magnets that are divided in the axial direction A of the rotary shaft. The armor ring includes a plurality of sub-rings that are divided in the axial direction A. The connector is disposed on the inner periphery of a connecting part between the two sub-rings and that are adjacent in the axial direction A and is disposed between the two sub-magnets that are adjacent in the axial direction A. The sub-magnets each have a recess that is depressed in the axial direction A. The connector has protrusions that fit to the recesses of the magnet.

Abstract: A spacer is disposed between a rotor and a bearing of an electric supercharger to fix the rotor. The spacer has a tapered surface with a diameter decreasing toward the bearing in an outer circumferential surface of the spacer. An area of an end surface of the spacer on a rotor side is larger than an area of an end surface of the spacer on a bearing side. A balance correction part that corrects balance of the spacer is disposed inside a recess formed in the end surface. A region of the end surface located on an outer side of the recess relative to a central axis of the spacer constitutes a surface coming in contact with the rotor.

Abstract: A fuel cell system includes a motor driving a compressor that supplies air to a fuel cell, a turbine assisting the compressor, a bypass valve that opens and closes the bypass flow path, and a controller. When a required air flow rate is equal to or higher than a threshold value, the controller closes the bypass valve and controls the motor to cause the air to flow through the fuel cell at a flow rate corresponding to the required air flow rate. When the required air flow rate is lower than the threshold value, the controller opens the bypass valve to cause the air to flow through the bypass flow path and controls the motor to cause the air to flow through the fuel cell at the flow rate corresponding to the required air flow rate.

Abstract: The manufacturing method for a turbocharger includes: connecting a shaft-side member to an actuator while the shaft-side member is inserted into a bush; combining the shaft-side member with a valve body-side member; and fixing the shaft-side member to the valve body-side member in a state where a wastegate valve is driven by the actuator so as to close the wastegate valve, and a contact surface of the valve body is pressed against a bearing surface.

Abstract: A turbocharger includes a wastegate and a turbine housing having a wastegate port. A valve member of the wastegate includes a recess, which defines a gas receiving chamber, into which exhaust gas that has passed through the wastegate port flows when the wastegate port is closed. The inner wall surface of the recess has a guide sidewall located on the outer side of the wastegate port when the wastegate port is closed by the valve member. The guide sidewall includes an inclined surface, which is inclined to approach the center of the gas receiving chamber toward the inlet of the gas receiving chamber.

Abstract: An imbalance correction position of a turbine wheel head is irradiated with a laser beam so that an outer peripheral portion of the turbine wheel head is left, and a groove provided by the laser irradiation is provided so that a depth of the groove is shallower toward a side closer to an outer periphery of the turbine wheel head. This makes it possible to secure a strength of a base part of an outer peripheral portion (an outer wall) of the groove, thereby making it possible to restrain deformation of the outer peripheral portion of the groove due to a centrifugal force acting by rotation of the turbine wheel head.

Abstract: A wastegate valve includes a swing arm, a valve body including a valve stem inserted through an insertion hole of the swing arm and a valve plate configured to close a wastegate port, a support plate being fixed to an end of the valve stem on a side opposite to the valve plate, and an elastic member biasing the valve plate in a extending direction of the valve stem. The elastic member includes a plurality of first lug portions and a plurality of second lug portions projecting from an outer peripheral edge of a connecting portion of the elastic member. The first lug portions and the second lug portions curve toward different sides in the extending direction of the valve stem.

Abstract: A fuel cell system includes: a fuel cell; a compressor; a turbine; an electric motor; a first transmission configured to change a gear ratio between the compressor and the electric motor, the first transmission being linked to the compressor rotating shaft and the motor rotating shaft; and a second transmission configured to change a gear ratio between the turbine and the electric motor, the second transmission being linked to the turbine rotating shaft and the motor rotating shaft. A gear ratio of the first transmission and a gear ratio of the second transmission are set such that a rotating speed of the electric motor is lower than a rotating speed of the compressor and a rotating speed of the turbine and such that a rotating speed of the compressor is higher than the rotating speed of the turbine.

Abstract: A spacer is disposed between a rotor and a bearing of an electric supercharger to fix the rotor. The spacer has a tapered surface with a diameter decreasing toward the bearing in an outer circumferential surface of the spacer. An area of an end surface of the spacer on a rotor side is larger than an area of an end surface of the spacer on a bearing side. A balance correction part that corrects balance of the spacer is disposed inside a recess formed in the end surface. A region of the end surface located on an outer side of the recess relative to a central axis of the spacer constitutes a surface coming in contact with the rotor.

Abstract: A second recirculation passage recirculates blow-by gas at an upstream section, which is upstream of an impeller of a turbocharger in an intake passage. A first passage branches and extends from a downstream section, which is downstream of the impeller in the intake passage. A second passage that forms part of the second recirculation passage connects the first passage and the upstream section to each other. A third passage, which is provided separately from the second passage, connects the first passage and the upstream section to each other. A change mechanism changes, in different manners, the flow rate of compressed gas recirculating to the upstream section through the second passage, and the flow rate of compressed gas recirculating to the upstream section through the third passage.

Abstract: An imbalance correction position of a turbine wheel head is irradiated with a laser beam so that an outer peripheral portion of the turbine wheel head is left, and a groove provided by the laser irradiation is provided so that a depth of the groove is shallower toward a side closer to an outer periphery of the turbine wheel head. This makes it possible to secure a strength of a base part of an outer peripheral portion (an outer wall) of the groove, thereby making it possible to restrain deformation of the outer peripheral portion of the groove due to a centrifugal force acting by rotation of the turbine wheel head.

Abstract: A cooling system for an engine system includes an engine coolant path inside an internal combustion engine and a turbine coolant path inside a turbocharger. A switching section is selectively switched to one of a first operation mode, in which coolant in the cooling system is permitted to flow through the engine coolant path and the turbine coolant path, and a second operation mode, in which the coolant in the cooling system is permitted to flow only through the engine coolant path, while not being permitted to flow through the turbine coolant path. When the switching section is in the first operation mode and a basic flow rate calculated based on an engine operating state is larger than an actual flow rate detected by a flow rate sensor by at least a determination amount, the switching section is switched to the second operation mode.

Abstract: A turbine housing of a turbocharger is formed by joining a scroll body with a base body. An exhaust passageway is formed between the scroll body and the base body. At the joint portion between the scroll body and the base body, an inside corner portion is formed by an inner peripheral surface of the scroll body that faces the exhaust passageway, and an outer peripheral surface of the base body that also faces the exhaust passageway. An inside fillet that is shaped to change the direction of exhaust gas along the inner peripheral surface of the scroll body to a direction along the outer peripheral surface of the base body is formed on the inside corner portion.