Apparatus and method for rotating sleeve engine hydrodynamic...

Details Apparatus and method for rotating sleeve engine hydrodynamic... Apparatus and method for rotating sleeve engine hydrodynamic...

2006-02-28

2006-02-28

McMahon, Marguerite (Department: 3747)

Internal-combustion engines

Rotating cylinder

Parallel to shaft

C123S314000, C123S059300, C123S0650VS, C123S08000R, C123S190170, C123S190120, C277S399000, C277S400000

Reexamination Certificate

active

07004119

ABSTRACT:
A hydrodynamic face seal100for sealing between the cylinder head300and rotating sleeve200of a rotating liner engine. The face of the face seal provides a sealing zone130for maintaining a lubricant layer of about 2 micrometers between the face seal and the sleeve; and a loading zone132. The loading zone includes hydrodynamic lift features such as inclined pads150or recessed step pads152. Oil is supplied to annular oil supply passage142between the sealing zone and the loading zone, and flows from the annular oil supply passage to radial passages144located between the step pads. A spring pre-load is provided to the seal. An outer secondary seal190is provided to contain the lubricant. One or more inner secondary seals is provided to contain lubricant and combustion gases. Spiral oil pumping grooves may be provided.

REFERENCES:
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patent: 3921602 (1975-11-01), Froumajou
patent: 4403873 (1983-09-01), Gardner
patent: 5199391 (1993-04-01), Kovalenko
patent: 5399024 (1995-03-01), Shapiro
patent: 5702110 (1997-12-01), Sedy
patent: 6289872 (2001-09-01), Dardalis
patent: 6446976 (2002-09-01), Key et al.

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