Turbocharger with friction-increasing coating

摘要

The turbocharger according to the invention has a rotor with a compressor wheel as well as a turbine wheel that is connected in a rotationally-fixed manner to the compressor wheel by means of a common shaft. The compressor wheel and the shaft are form-fittingly tensioned with one another, wherein respectively at least one or two torque-transmitting contact surfaces, which lie one atop the other, between components force-fittingly tensioned with one another, is provided with a friction-increasing coating.

主权项

1. A method for assembling a turbocharger, comprising:
coating at least a portion of at least one of a compressor wheel, a turbine wheel and a shaft, wherein the coating includes a carrier layer and a particle embedded in the carrier layer; connecting at least one of the turbine wheel and the compressor wheel with the shaft in a rotationally-fixed manner; attaching a shaft nut to a threaded section of the shaft; clamping the compressor wheel against a bearing element having an opening receiving the shaft, and the bearing element in turn is clamped against a stop surface of the shaft, wherein clamping the compressor wheel against the bearing element includes applying an axial force to the compressor wheel defined by the shaft nut untwisted against the compressor wheel on the threaded section of the shaft; and forming a micro-fit between the coated portion of the at least one of the compressor wheel, turbine wheel and shaft with a contact surface of at least one other of the compressor wheel, turbine wheel and shaft, the coating providing a friction-increasing connection between the coated portion and the contact surface and exhibiting via the particle a greater hardness with a greater thermal loading capacity in comparison to the respective contact surface.