초록 ▼

A motor-driven supercharger is provided with a thrust bearing (30) rotatably supporting a thrust force applied to a turbine shaft (12). The thrust bearing (30) is constituted by a small-diameter disc-shaped thrust collar (32) rotating together with a turbine shaft, and a turbine side thrust bearing

A motor-driven supercharger is provided with a thrust bearing (30) rotatably supporting a thrust force applied to a turbine shaft (12). The thrust bearing (30) is constituted by a small-diameter disc-shaped thrust collar (32) rotating together with a turbine shaft, and a turbine side thrust bearing (34) and a compressor side thrust bearing (36) which block a movement in an axial direction of the thrust collar. The compressor side thrust bearing (36) has a small-diameter ring portion (37) including a thrust surface which is in contact with the thrust collar and has approximately an equal diameter, and a flange portion (38a) fixed to a housing (16) in the turbine side, and the small-diameter ring portion and the flange portion are arranged at different positions in an axial direction.

대표청구항 ▼

What is claimed is: 1. A motor-driven supercharger comprising:(A) a turbine shaft having a turbine impeller in one end;(B) a compressor impeller rotationally driven by the turbine shaft;(C) a motor stator fixed within a housing;(D) a motor rotor rotationally driven by the motor stator; and(E) a th

What is claimed is: 1. A motor-driven supercharger comprising:(A) a turbine shaft having a turbine impeller in one end;(B) a compressor impeller rotationally driven by the turbine shaft;(C) a motor stator fixed within a housing;(D) a motor rotor rotationally driven by the motor stator; and(E) a thrust bearing rotatably supporting a thrust force applied to the turbine shaft,wherein the thrust bearing comprisesi. a small-diameter disc-shaped thrust collar rotating together with the turbine shaft; andii. a turbine side thrust bearing and a compressor side thrust bearing that block movement of the thrust collar in an axial direction, wherein the compressor side thrust bearing is disposed on a side closer to the compressor impeller than the thrust collar in the axial direction, andwherein the compressor side thrust bearing comprisesa. a small-diameter ring portion including a thrust surface that is in contact with the thrust collar on a turbine side and the thrustsurface has approximately an equal diameter to that of the thrust collar;b. a truncated conical portion that has a conical outer surface that gradually increases to the turbine side from an outer peripheral surface of the small-diameter ring portion;c. a flange portion that is positioned at a turbine side end portion of the truncated conical portion and that is fixed to the housing closer to the turbine than the thrust collar; andd. an oil supply flow path that opens on the thrust surface and supplies a lubricating oil to the thrust surface, and the small-diameter ring portion and the flange portion are located at different positions in the axial direction.