Rotary kinetic fluid motors or pumps – With lubricating – sealing – packing or bearing means having... – For shaft sealing – packing – lubricating or bearing means
Reexamination Certificate
2005-04-26
2005-04-26
Trieu, Theresa (Department: 3748)
Rotary kinetic fluid motors or pumps
With lubricating, sealing, packing or bearing means having...
For shaft sealing, packing, lubricating or bearing means
C415S112000, C415S113000, C415S109000, C415S175000, C415S230000, C415S229000, C277S372000, C384S477000, C384S483000
Reexamination Certificate
active
06884022
ABSTRACT:
An improved diesel engine water pump includes three main features that aid in extending the maintenance-free life of the pump. The impeller shaft is carried by tapered roller shaft support bearings of which the impeller bearing has a floating outer race that is urged axially by a preload spring to provide a prescribed axial preload that maintains concentricity of the shaft with the axis and prolongs bearing life. An improved oil seal combines an oil slinger, a stationary deflector and a lip oil seal with a return passage to the engine to more effectively limit oil leakage from the pump. An improved water seal includes pressurized water jets fed from the pump volute that flush wear particles from the water seal surface and increase water seal life. Further details of these features are also disclosed.
REFERENCES:
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patent: 5558491 (1996-09-01), Andrews
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patent: 5865597 (1999-02-01), Ozawa
Albright Randal K.
Duerr Werner C.
Kane Thomas J.
Zagone John R.
Brooks Cary W.
General Motors Corporation
Trieu Theresa
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