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US 7,334,799 B2Granted
Sealing device for a turbocharger
AssigneeCaterpillar Inc.
InventorStephen J. O'Hara
Life of this patent
Estimating the term…
Abstract
A sealing device has a seal ring and a cylindrical bellows portion connected to the seal ring. The cylindrical bellows portion has a corrugated outer surface. A turbocharger utilizing the sealing device has a turbine wheel connected to a shaft and a compressor wheel connected to the shaft. The sealing device is sealingly engaged with the shaft. The sealing device provides a seal between a bearing housing of the turbocharger and either a turbine housing or a compressor housing.
Claims20
A sealing device comprising:
- a seal ring having three sealing surfaces;
- and
- a cylindrical bellows portion connected to said seal ring, said bellows portion having a corrugated radial outer surfaces;
- wherein the seal ring is configured to selectively operate among a first, second and third mode, the first mode including a first one of the three sealing surfaces engaged with a first radially extending surface and a second one of the three sealing surfaces disengaged from a second radially extending surface, the second mode including the first sealing surface disengaged from the first radially extending surface and the second sealing surface engaged with the second radially extending surface, and the third mode including each of the first and second sealing surfaces disengaged from the first and second radially extending surfaces.
1 more element
A turbocharger comprising:
- a turbine wheel,
- a shaft having a first portion and a second portion spaced from said first portion, said first portion connected to said turbine wheel,
- a compressor wheel attached to said second portion of said shaft, and
- a sealing device sealingly engaged with an axially extending surface of said shaft and potentially sealingly engageable and disengageable with each of two radially extending surfaces, said sealing device having a seal ring and a cylindrical bellows portion connected to said seal ring, said bellows portion having a corrugated outer surface.
1 more element
A method of sealing a turbocharger comprising:
- providing a sealing device having a seal ring connected to and at least partially surrounded by a cylindrical bellows portion, said seal ring having a bore, and said bellows portion having a corrugated outer surface and a corrugated end surface, the corrugations of the outer surface and the end surface orientated to force the seal ring in directions approximately perpendicular to one another;
- connecting said sealing device to a bearing housing of a turbocharger;
- and
- inserting a shaft of said turbocharger through said bore of said seal ring.
1 more element
Dependencies are inferred from the claim text.