Turbocharger

A turbocharger comprising:

• a rotating shaft;
• a compressor provided on a first end side of the rotating shaft;
• a turbine provided on a second end side of the rotating shaft;
• a compressor-side floating bearing that rotatably supports the rotating shaft;
• a turbine-side floating bearing that rotatably supports the rotating shaft, the turbine-side floating bearing being arranged at a distance from the compressor-side floating bearing in an axial direction of the rotating shaft and arranged closer to the turbine than the compressor-side floating bearing in the axial direction of the rotating shaft;
• and
• a bearing housing that houses the compressor-side floating bearing and the turbine-side floating bearing, the bearing housing being internally provided with a turbine-side oil feeding passage through which oil to be fed to the turbine-side floating bearing flows and a compressor-side oil feeding passage through which oil to be fed to the compressor-side floating bearing flows,
• wherein
• the compressor-side oil feeding passage includes a compressor-side oil feeding hole extending toward the compressor-side floating bearing, and a compressor-side oil feeding groove formed at an outlet-side end of the compressor-side oil feeding hole so as to extend along an outer periphery of the compressor-side floating bearing and to be open toward the outer periphery of the compressor-side floating bearing,
• the turbine-side oil feeding passage includes a turbine-side oil feeding hole extending toward the turbine-side floating bearing, and a turbine-side oil feeding groove formed at an outlet-side end of the turbine-side oil feeding hole so as to extend along an outer periphery of the turbine-side floating bearing and to be open toward the outer periphery of the turbine-side floating bearing, and
• the compressor-side oil feeding groove has a larger opening area than the turbine-side oil feeding groove.

A turbocharger comprising:

• a rotating shaft;
• a compressor provided on a first end side of the rotating shaft;
• a turbine provided on a second end side of the rotating shaft;
• a compressor-side floating bearing that rotatably supports the rotating shaft;
• a turbine-side floating bearing that rotatably supports the rotating shaft, the turbine-side floating bearing being arranged at a distance from the compressor-side floating bearing in an axial direction of the rotating shaft and arranged closer to the turbine than the compressor-side floating bearing in the axial direction of the rotating shaft;
• and
• a bearing housing that houses the compressor-side floating bearing and the turbine-side floating bearing, the bearing housing being internally provided with a turbine-side oil feeding passage through which oil to be fed to the turbine-side floating bearing flows and a compressor-side oil feeding passage through which oil to be fed to the compressor-side floating bearing flows,
• the turbocharger further comprising a sleeve arranged over the rotating shaft between the compressor-side floating bearing and the turbine-side floating bearing, the sleeve having a first axial end that is capable of contacting a second axial end of the compressor-side floating bearing and having a second axial end that is capable of contacting a first axial end of the turbine-side floating bearing,
• wherein a discharge port, through which oil is discharged, is formed in an axially central portion of the sleeve, the oil being fed to the compressor-side floating bearing and the turbine-side floating bearing and having flowed in between the rotating shaft and the sleeve, and
• the sleeve has a larger inner diameter at an opening end thereof on the compressor-side floating bearing side than at an opening end thereof on the turbine-side floating bearing side.

A turbocharger comprising:

• a rotating shaft;
• a compressor provided on a first end side of the rotating shaft;
• a turbine provided on a second end side of the rotating shaft;
• a compressor-side floating bearing that rotatably supports the rotating shaft;
• a turbine-side floating bearing that rotatably supports the rotating shaft, the turbine-side floating bearing being arranged at a distance from the compressor-side floating bearing in an axial direction of the rotating shaft and arranged closer to the turbine than the compressor-side floating bearing in the axial direction of the rotating shaft;
• and
• a bearing housing that houses the compressor-side floating bearing and the turbine-side floating bearing, the bearing housing being internally provided with a turbine-side oil feeding passage through which oil to be fed to the turbine-side floating bearing flows and a compressor-side oil feeding passage through which oil to be fed to the compressor-side floating bearing flows,
• the turbocharger further comprising a first C-type retaining ring installed on the rotating shaft and contacting an end of the compressor-side floating bearing that is on the turbine-side floating bearing side,
• wherein a second C-type retaining ring installed on the rotating shaft and contacting an end of the turbine-side floating bearing that is on the compressor-side floating bearing side,
• the first C-type retaining ring is installed on the rotating shaft such that a joint portion of the first C-type retaining ring is oriented to face an oil drain outlet of the housing, and
• the second C-type retaining ring is installed on the rotating shaft such that a joint portion of the second C-type retaining ring is oriented to face a direction other than the direction toward the oil drain outlet of the housing.