Coking-resistant shaft/bushing mechanism for an exhaust gas...

Details Coking-resistant shaft/bushing mechanism for an exhaust gas... Coking-resistant shaft/bushing mechanism for an exhaust gas...

2006-09-12

2006-09-12

Le, Huyen (Department: 3751)

Valves and valve actuation

Mechanical movement actuator

Particularly packed or sealed

C251S330000, C123S568110, C123S568210, C123S568260, C137S242000, C137S244000

Reexamination Certificate

active

07104522

ABSTRACT:
An exhaust gas recirculation valve assembly including a bushing and pintle shaft sub-assembly having a pintle shaft supported by a sleeve bushing, the contact area between the shaft and bushing being reduced such that coking deposits that form on the remaining contact area can be broken by the force of the valve actuator, thereby preventing sticking of the valve from coking accumulations. Either the shaft surface or the bushing surface is relieved in a pattern of incuse areas and residual bearing areas. A currently preferred pattern is a helix.

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