Abstract: A charging system of a fuel cell includes a housing for receiving a rotatable compression wheel and a rotatable expansion wheel. The housing includes a compression section and an expansion section. The compression section is designed to receive the compression wheel and the expansion section is designed to receive the expansion wheel. The compression wheel is produced from a first material. The compression wheel and the expansion wheel are designed in the form of a single-piece system wheel which has a shaft.

Abstract: A charging system of a fuel cell includes a housing for receiving a rotatable compression wheel and a rotatable expansion wheel. A compression section of the housing receives the compression wheel and an expansion section of the housing receives the expansion wheel. The compression section and the expansion section effect wall heat exchange of compression gases flowing in the compression section and expansion gases flowing in the expansion section. The compression wheel and the expansion wheel are a single-piece system wheel which has a shaft. A housing wall separating the compression section and the expansion section has a seal in the form of a labyrinth seal. The labyrinth seal is formed between the compression wheel and the housing wall. The expansion wheel has a smaller diameter than the compression wheel. The system wheel is liquid-repellent. A hub surface of the system wheel facing the electric motor has a projection.

Abstract: A charging system of a fuel cell includes a housing for receiving a rotatable compression wheel and a rotatable expansion wheel. The housing includes a compression section and an expansion section. The compression section is designed to receive the compression wheel and the expansion section is designed to receive the expansion wheel. An electric motor for driving a shaft is connected at least to the expansion wheel for conjoint rotation therewith. The electric motor is accommodated in a motor housing. In order to cool the electric motor the motor housing is formed with the housing such that a flow can pass therethrough. The expansion wheel for delivering expansion gas, which flows through the expansion wheel, into the motor housing is arranged in the housing. The expansion wheel is arranged between the compression wheel and the motor housing.

Abstract: A control device of an exhaust gas-conducting section of a turbocharger includes a pivotable closing device with a closing element and an element lever. A first element portion thereof opens and closes a first flow cross-section of a flow connection and a second element portion opens and closes a second flow cross-section of a bypass duct of the exhaust gas-conducting section. The element lever includes a lever end portion engaging into a cavity of the closing element. A holding element is fixedly connected to the closing element. The lever end portion includes a first contact surface and, axially spaced apart, a second contact surface. The first contact surface includes an axially-extending first partial surface and a radially-extending second partial surface connected to one another by a third partial surface. The partial surfaces are designed to be able to effect contact with the closing element.

Abstract: An exhaust gas-conducting section of an exhaust turbocharger comprises a duct with a through-flow opening which can be fully or at least partially blocked or released by a closure element of a control device. The closure element is designed as a poppet valve. The closure element can be moved by an actuator can be disposed in a wall of the exhaust gas-conducting section. The closure element has a closure body with an annular section surface on its bottom surface which faces the through-flow opening. The section surface corresponds to an element seat formed in the wall. Its top surface faces away from the bottom surface and is designed in a profiled manner in order to produce a top surface at least partially corresponding to another element seat and/or to achieve flow-optimized circulation.

Abstract: A connection device for an exhaust gas turbocharger has a bent first element with a first tensioning arm at a first end. A second bent element has a second tensioning arm at a second end opposite the first end. A third end of the first element is formed opposite a fourth end of the second element. The first tensioning arm and the second tensioning arm are connectable by a first connecting element. The third end and the fourth end are movably connected with each other by a second connecting element. A transition is elastically formed between the respective tensioning arm and a supporting portion of the particular element, which extends between the tensioning arm and the third or fourth, respectively, end. The first element or the second element is formed in a profiled manner.

Abstract: An exhaust turbocharger includes an air-guiding section. A spiral channel is formed downstream of a wheel chamber in the air-guiding section. Between the wheel chamber and the spiral channel, a diffuser channel is formed in the air-guiding section. Upstream of the wheel chamber, an inlet channel is formed in the air-guiding section for the inflow of fluid to be compressed. In the inlet channel, a cross-section-changing unit. The cross-section-changing unit comprises an operating element with at least two movable element parts to produce a baffle which can protrude, with the aid of an adjusting unit, into the inlet cross-section rotationally and/or in a translational manner or can be removed from the inlet cross-section. The two element parts are fixedly disposed at one element end jointly in the air-guiding section. A relative movement of the element parts can be brought about in particular in an opposing direction.

Abstract: An exhaust gas turbocharger includes a turbine casing (4) within which a turbine wheel (10) is rotatably arranged relative to an axis of rotation (1). A guide vane ring (22) is non-rotatably arranged which comprises variable guide vanes (44) which are arranged upstream of the turbine wheel (10) with respect to an exhaust gas flow. The guide vane ring (22) is centered by means of a matched pair of two contact surfaces (24, 26) pressed against each other with respect to the turbine casing (4), of which at least the one contact surface (24 or 26, respectively) is formed conically.

Abstract: An adjustable guide apparatus for a turbine, comprising a bearing ring with a plurality of guide vanes, wherein the guide vanes are rotatably mounted on the bearing ring with the aid of guide vane shafts, wherein in order to position the guide vane, the guide vane shaft is allocated an adjusting lever which engages in a rotatable rotating ring of the adjustable guide apparatus, and wherein, in order to be held in an exhaust gas guiding section of the turbine, the adjustable guide apparatus has a support ring, and wherein the support ring serves to mount the rotating ring. The rotating ring is radially and/or axially guided with the aid of at least one guiding element, wherein the guiding element is received on the support ring. Furthermore, the invention relates to a turbine with an adjustable guide apparatus and to an exhaust turbocharger.

Abstract: The invention relates to an exhaust gas turbocharger with a manifold-flow casing, in particular a dual-flow casing (47) and a turbine wheel (34) which is rotatably arranged within said manifold-flow casing, onto which an exhaust gas flow (14; 16) may be led via at least one of several flow channels (18, 26), and an outlet opening (78; 80) following said one flow channel (18, 26) and covering an angle of 180° max. about an axis of rotation (44) of the turbine wheel (34), so that a shaft (38) is rotating which is arranged coaxially and non-rotationally relative to the turbine wheel (34), which is supported in a shaft bearing (42).

Abstract: An exhaust turbocharger includes an air-guiding section. A spiral channel is formed downstream of a wheel chamber in the air-guiding section. Between the wheel chamber and the spiral channel, a diffuser channel is formed in the air-guiding section. Upstream of the wheel chamber, an inlet channel is formed in the air-guiding section for the inflow of fluid to be compressed. In the inlet channel, a cross-section-changing unit. The cross-section-changing unit comprises an operating element with at least two movable element parts to produce a baffle which can protrude, with the aid of an adjusting unit, into the inlet cross-section rotationally and/or in a translational manner or can be removed from the inlet cross-section. The two element parts are fixedly disposed at one element end jointly in the air-guiding section. A relative movement of the element parts can be brought about in particular in an opposing direction.

Abstract: A connection device for an exhaust gas turbocharger has a bent first element with a first tensioning arm at a first end. A second bent element has a second tensioning arm at a second end opposite the first end. A third end of the first element is formed opposite a fourth end of the second element. The first tensioning arm and the second tensioning arm are connectable by a first connecting element. The second end and the fourth end are movably connected with each other by a second connecting element. A transition is elastically formed between the respective tensioning arm and a supporting portion of the particular element, which extends between the tensioning arm and the third or fourth, respectively, end. The first element or the second element is formed in a profiled manner.

Abstract: A connection device for an exhaust gas turbocharger has an essentially bent first element and an essentially bent second element. The first element and the second element are detachably connected with each other in a first end region or in a second end region, respectively, and are movably connected with each other in a third end region or in a fourth end region, respectively. A first supporting portion extends between the first end region and the third end region and a second supporting portion extends between the second end region and the fourth end region. The connection device comprises a recess which is formed in the element for the reduction of stresses.

Abstract: An adjustable guide apparatus for a turbine, comprising a bearing ring with a plurality of guide vanes, wherein the guide vanes are rotatably mounted on the bearing ring with the aid of guide vane shafts, wherein, in order to position the guide vane, the guide vane shaft is allocated an adjusting lever which is designed to be able to engage in a rotatable rotating ring of the adjustable guide apparatus, and wherein, in order to be held in an exhaust gas guiding section of the turbine, the adjustable guide apparatus has a support ring, and wherein the support ring serves to mount the rotating ring. In accordance with the invention the rotating ring is formed to be free of contact with the support ring. Furthermore, the invention relates to a turbine and to an exhaust turbocharger.

Abstract: A regulating device for an exhaust turbocharger, is received in an exhaust gas conducting section of the exhaust turbocharger, with the aid of the regulating device a fluid flow onto a turbine wheel rotatably received in the exhaust gas conducting section can be conditioned, a through-flow opening formed in the exhaust gas conducting section is to be opened and closed with the aid of a valve element of the regulating device, the valve element is arranged on a pivot arm of the regulating device, and wherein the valve element has a sealing surface for avoiding a leak in a closed position of the regulating device. To reduce secondary torques acting upon the valve element during operation, a connection is formed between the pivot arm and the valve element in or at least close to a center of gravity of an effective valve element body of the valve element.

Abstract: A bearing section for an exhaust turbocharger comprises a receiving opening for receiving a shaft of a rotor assembly of the exhaust turbocharger. The bearing section is designed for positioning bearing elements for supporting the shaft. A lubricant circuit is designed for supplying lubricant to the bearing elements. Lubricant channels are formed in the bearing section. In order to reduce a component temperature of the bearing section, a cooling jacket is provided, through which coolant can flow. The cooling jacket comprises a coolant channel, an inlet channel and an outlet channel. The inlet channel issues at a first opening point into the coolant channel and the outlet channel is connected at a second opening point to the coolant channel in such a way that a flow can pass therethrough. A rib is provided in the coolant channel.

Abstract: A connection device for an exhaust gas turbocharger includes an essentially bent first element and an essentially bent second element. The first element has a radially extending first clamping arm in a first end region and the second element has a radially extending second clamping arm in the first end region opposite the first clamping arm. The first element is movably connected with the second element in a second end region. The first clamping arm and the second clamping arm may be movably connected by a first connecting element of the connection device. The first element comprises a first supporting portion and the second element comprises a second supporting portion between the two end regions. A stiffening element is formed in a transition region between the clamping arm and the supporting portion for increasing the strength of the connection device.

Abstract: An exhaust gas-conducting section of an exhaust turbocharger comprises a duct with a through-flow opening which can be fully or at least partially blocked or released by a closure element of a control device. The closure element is designed as a poppet valve. The closure element can be moved by an actuator can be disposed in a wall of the exhaust gas-conducting section. The closure element has a closure body with an annular section surface on its bottom surface which faces the through-flow opening. The section surface corresponds to an element seat formed in the wall. Its top surface faces away from the bottom surface and is designed in a profiled manner in order to produce a top surface at least partially corresponding to another element seat and/or to achieve flow-optimized circulation.

Abstract: The invention relates to a control device for a turbocharger, comprising an exhaust gas conducting section through which fluid can flow and which includes a bypass duct for bypassing a turbine wheel that is rotatably arranged in the exhaust gas conducting section, and comprising an adjusting arm (3) for accommodating a valve element (2) provided for opening or blocking a flow cross-section of the bypass duct; the adjusting arm (3) is movably accommodated in the exhaust gas conducting section; furthermore, a flexible element (14) is provided at least for securing the valve element (2) in place on the adjusting arm (3). According to the invention, the flexible element (14) is designed to be retained radially and axially by the valve element (2).

Abstract: An exhaust gas turbocharger includes a turbine casing (4) within which a turbine wheel (10) is rotatably arranged relative to an axis of rotation (1). A guide vane ring (22) is non-rotatably arranged which comprises variable guide vanes (44) which are arranged upstream of the turbine wheel (10) with respect to an exhaust gas flow. The guide vane ring (22) is centered by means of a matched pair of two contact surfaces (24, 26) pressed against each other with respect to the turbine casing (4), of which at least the one contact surface (24 or 26, respectively) is formed conically.