Patent ID: 8961151
Filing Date: 2015-02-24
Classification: F01D,F02B,F02C,F04D,F05D

Abstract:
1. A turbocharger comprising: a compressor for delivering pressurised air to an intake of an internal combustion engine, the compressor comprising a compressor housing and a compressor impeller disposed in the compressor housing: a turbine bar receipt of exhaust gas from the engine, the turbine comprising a turbine housing and a turbine wheel disposed in the turbine housing; a turbocharger shaft interconnecting the compressor impeller and the turbine wheel; a bearing housing disposed between the compressor and turbine for housing a bearing assembly to support the turbocharger shaft in rotation; a shaft bore defined in at least one of the compressor, turbine or bearing housings for receipt of the shaft; a sealing arrangement for restricting leakage of lubricant along the shaft bore from the bearing housing to the compressor or turbine housing, the sealing arrangement comprising at least one sealing member disposed around the shaft in the shaft bore and a gas passage communicating with the shaft bore; and a valve movable between a first position in which the gas passage is in communication with a gas supply path for supplying gas to the shaft bore and a second position in which the gas passage is in communication with a vent path for venting gas from the shaft bore; wherein the valve is arranged such that it is movable in response to the prevailing pressure within the compressor or turbine housing at a location in fluid communication with the sealing arrangement.