Cummins Turbo Technologies Limited

David Gee

Robert L Holroyd

Chris Enright

Iain Taylor

Jonathon Heslop

A turbomachine comprising a housing defining a bearing cavity and a turbine chamber separated by a first wall, a heat shield disposed between the first wall and the turbine wheel, a heat shield cavity defined between the first wall and the heat shield. The shaft extends through a passage defined in part by a first aperture in the wall and a second aperture in the heat shield. A first seal is provided between the shaft and the first aperture. The housing defines a first gas channel communicating with the heat shield cavity for connection to a pressure source for raising pressure within the heat shield cavity. A second channel is provided between the heat shield cavity and the passage, the second channel opening to the passage on the opposite side of the first seal to the bearing assembly. A second seal is provided between the shaft and the second aperture.

Turbomachine

A turbomachine comprises a housing () defining a bearing cavity () and a turbine chamber () separated by a first wall. A heat shield () is disposed between the first wall and the turbine wheel (), a heat shield cavity () being defined between the first wall and the heat shield (). The shaft () extends through a passage () defined at least in part by a first aperture () in said wall and a second aperture () in the heat shield (). A first seal () is provided between the shaft () and said first aperture (). The housing defines a first gas channel () communicating with the heat shield cavity () for connection to a pressure source for raising pressure within the heat shield cavity (). A second channel () is provided between the heat shield cavity () and said passage (), the second channel opening to said passage () on the opposite side of said first seal () to said bearing assembly (). A second seal () is provided between the shaft () and said second aperture ().

An oil control device inhibits the flow of oil along a shaft () rotating about an axis. The oil control device comprises an annular body () for rotation with said shaft () and includes a first face () extending generally radially from said axis. A second radially outer circumferential surface () is provided, extending generally axially. An oil slinging groove () extends into said body () and has a mouth () defined between a first circumferentially extending rim () and a second circumferentially extending rim (). The second rim () is spaced both radially and axially from the first rim (). The groove () is defined at least in part by a wall () which meets the first rim () at an acute angle to a radial plane. The groove () is also defined at least in part by a wall () which meets the second rim () at an acute angle to the direction of the axis.

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Grenoside, United Kingdom

David Gee