Abstract:
In a fuel injection system and method for a diesel engine with compression induced ignition, NOx emissions are reduced by providing a supplemental fuel injection from a supplemental injection nozzle, in addition to the primary fuel injection through a primary injection nozzle. The supplemental injection nozzle injects a supplemental quantity of fuel onto a vaporization surface such as an exhaust valve, a flame ring area, or a top surface of the piston, in the combustion chamber, whereupon the supplemental fuel vaporizes and forms a lean air/fuel mixture. Thereafter, the primary injection nozzle injects the main fuel charge into the combustion chamber, to produce a rich air/fuel combustion mixture, which is then ignited and combusts.
Abstract:
The exhaust-gas turbine comprises a turbine casing (1), a shaft (3) rotatably mounted in a bearing housing (4), a turbine wheel (5) arranged on the shaft, and a heat-protection wall (2), the heat-protection wall defining with the turbine casing an inflow passage (6) leading to the turbine wheel. The heat-protection wall has two seatings, the first seating resting on the bearing housing (4) and the second seating resting on the turbine casing (1). If the heat-protection wall (2) becomes hot, the two seatings are pressed against the bearing housing and the turbine casing. The turbine casing is pressed outward in the radial direction. Centering of the heat-protection wall (2) and thus also of the turbine casing (1) is ensured by the radially inner seating of the heat-protection wall.
Abstract:
The invention relates to a radial bearing arrangement (110) of an exhaust gas turbocharger (100) for mounting a shaft (120) in a bearing housing (130). The radial bearing arrangement (110) comprises a radial bearing bush (140) arranged between the shaft (120) and the bearing housing (130), wherein the radial bearing bush (140) features a radially outwardly projecting collar (141), which interacts in the axial direction with an axial stop (131) on the bearing housing (130). The geometry of the radially outwardly projecting collar (141) is interrupted by cut-outs (142), such that a force acting on the collar (141) as a result of an oil feed pressure is minimized, and wherein the radial bearing bush (140) is configured such that a lubricating film can form between an end surface (144) of the radial bearing bush (140) and a counterpiece (160) arranged on the shaft (120).
Abstract:
The present invention relates to a compressor assembly for a turbocharger. The compressor assembly may comprise a spiral housing with a flow channel which is designed to convey a fluid which can be sucked up from outside the compressor assembly, a compressor outlet flange which is fluidically connected to the spiral housing via the flow channel, and an injection device designed to introduce a fluid from outside the compressor assembly into the flow channel, wherein the injection device is arranged outside the flow channel of the spiral housing.
Abstract:
An exhaust turbocharger comprises a turbine having a turbine wheel and a compressor having a compressor wheel. The turbine wheel and the compressor wheel are connected by a shaft rotatably mounted in a bearing housing. A means for axially securing the shaft and the turbine wheel connected thereto is provided between the compressor wheel and the turbine wheel. The means limits an axial movement of the shaft and of the turbine wheel connected thereto in the direction of the turbine in the event of the compressor wheel bursting. The means comprises a component which is screwed onto the shaft during mounting and is fixed in the axial direction in the housing.
Abstract:
The present disclosure relates to a diffuser for a radial compressor. The diffuser may comprise a diffusor duct portion formed by first and second side walls that are arranged so as to diverge at least partially from one another in a direction of flow, a blade ring having a number of blades arranged at least partially in the diffusor duct portion with each blade having a pressure side and a suction side delimited by a blade leading edge and by a blade trailing edge of the respective blade, a number of pressure equalizing openings incorporated into at least one of the first and second side walls of the diffuser duct portion in a region where the first and second side walls diverge from one another with each of the pressure equalizing openings being arranged between the pressure side of one blade and the suction side of an adjacent blade of the blade ring, and a first annular duct arranged behind the pressure equalizing openings and fluidically connected to the diffuser duct portion via at least two of the pressure equalizing openings, such that a number of regions between two adjacent blades of the blade ring in the diffuser duct portion are fluidically connectable together.
Abstract:
Illustrative embodiments of vaned diffusers of radial compressors and exhaust turbochargers comprising the same are disclosed. In some illustrative embodiments, angular spacings between guide vanes of the diffuser which are arranged adjacent to one another may vary along the circumference, allowing resonant vibration of the compressor to be reduced. In addition, the narrowest cross-sectional area between in guide vanes can be held constant, allowing an increased efficiency and a positive effect on the surge margin.
Abstract:
A lifting apparatus for assembly of exhaust turbocharger allows the removal of the rotor block from the housing in a horizontal direction. The lifting apparatus includes a cantilever, which is fastened on a vertical stop, i.e. on an axial end, of the housing, and on which there is arranged a structure which can be moved along the cantilever and which is likewise fastened on a vertical stop, i.e. an axial end of the rotor block.