Electric turbocharger
OwnerKatsunori Hayashiinventor
Life of this patent
Estimating the term…
Abstract
An electric turbocharger includes: a thrust collar having a disk shape and provided to protrude in a flange shape around a rotation shaft between a compressor impeller and an electric motor; a thrust air bearing facing a compressor impeller-side surface of the thrust collar, and supporting the rotation shaft in a thrust direction; a thrust air bearing facing an electric motor-side surface of the thrust collar, and supporting the rotation shaft in the thrust direction; a bearing space which is interposed between the thrust air bearings and in which the thrust collar is accommodated; and a labyrinth seal portion provided along an outer peripheral surface of the thrust collar, and partitioning the bearing space into a first region on a compressor impeller side and a second region on an electric motor side.
Claims18
An electric turbocharger comprising:
- a compressor impeller, wherein a compressor impeller back space is formed on a side of a back surface of the compressor impeller;
- a motor disposed in a motor space in a motor housing;
- a thrust collar protruding around a rotation shaft between a compressor impeller and a motor;
- a first air bearing that faces the thrust collar between the thrust collar and the compressor impeller;
- a second air bearing that faces the thrust collar between the thrust collar and the motor, wherein the first air bearing and the second air bearing form a bearing space in which the thrust collar is accommodated;
- and
- a labyrinth seal that is provided along an outer peripheral surface of the thrust collar and partitions the bearing space into a first region and a second region, wherein the first region of the bearing space is closer to the compressor impeller and the second region of the bearing space is closer to the motor,
- wherein the motor space has a lower pressure compared to the compressor impeller back space.
An electric turbocharger comprising:
- a rotation shaft;
- a compressor impeller, wherein a compressor impeller back space is formed on a side of a back surface of the compressor impeller;
- a motor disposed in a motor space in a motor housing;
- a first air bearing disposed between the motor and the compressor impeller;
- a second air bearing disposed between the motor and the first air bearing;
- a spacer disposed between the first air bearing and the second air bearing;
- and
- a pressure difference keeping structure that comprises the first air bearing, the second air bearing and the spacer and keeps a pressure difference between the motor space and the compressor impeller back space, and
- wherein the motor space has a lower pressure compared to the compressor impeller back space.
Dependencies are inferred from the claim text.