Abstract: An engine assembly comprising an internal combustion engine and a waste heat recovery system, wherein the waste heat recovery system is configured to direct refrigerant around a loop which comprises: a heat exchanger configured to transfer heat from engine exhaust gases to the refrigerant such that the refrigerant is vaporised; a turbine configured to receive and be driven by the vaporised refrigerant; and a condenser configured to cool and condense the refrigerant for subsequent delivery in liquid form to the heat exchanger; wherein the turbine comprises a turbine wheel connected to a shaft which is held in a shaft housing, a bearing lubricated by liquid refrigerant being provided between the shaft and the shaft housing, and wherein squeeze film dampers which utilise the liquid refrigerant are provided between the bearing and the shaft housing.

Abstract: A variable geometry turbine comprise a housing; a turbine wheel supported in the housing for rotation about a turbine axis: and an annular inlet passage upstream of said turbine wheel defined between respective inlet surfaces defined by an annular nozzle ring and a facing annular shroud. The nozzle ring and shroud are axially movable relative to one another to vary the size of the inlet passage; the nozzle ring having a circumferential array of inlet vanes extending across the inlet passage. The shroud covers the opening of a shroud cavity and defines a circumferential array of vane slots, each vane slot corresponding to an inlet vane, the vane slots and shroud cavity being configured to receive said inlet vanes to accommodate axial movement of the nozzle ring.

Abstract: A generator arrangement comprises a turbocharger having a compressor configured to be placed in fluid flow communication with an engine inlet, and a first turbine having a first turbine wheel, a first inducer portion upstream, in use, of the first turbine wheel and configured to be placed in fluid flow communication with an engine outlet, and a first exducer portion downstream, in use, of the first turbine wheel; and an electrical generator having a second turbine having a second turbine wheel, a second inducer portion upstream, in use, of the second turbine wheel and configured to be placed in fluid flow communication with the engine outlet, and a second exducer portion downstream, in use, of the second turbine wheel. The first and second turbines are arranged in parallel to one another; and the first inducer portion and second inducer portion, and/or the first exducer portion and second exducer portion are contiguous.

Abstract: A turbocharger arrangement comprises a turbocharger and a generator. The turbocharger comprises a turbine having a turbine wheel and a compressor having a compressor wheel. The turbine wheel and the compressor wheel are mounted to a shaft, the shaft being supported by a bearing assembly located in a bearing housing between the turbine and the compressor, such that the shaft may rotate about an axis; The compressor wheel is between the generator and the bearing assembly; and an inducer portion of the compressor wheel is between an exducer portion of the compressor wheel and the bearing assembly.