Piston assembly having abradable coating

Details Piston assembly having abradable coating Piston assembly having abradable coating

1994-07-05

1995-11-28

Lopez, F. Daniel

Expansible chamber devices

Piston

Open-ended hollow skirt type

29888048, 29888049, 29888074, 451 49, 1231936, F16J 104

Patent

active

054697778

ABSTRACT:
A piston assembly operable within a fluid bathed, cylinder wall, comprising a piston body (10) having at least one annular land (36) adapted to be in close-fitting relationship to the cylinder wall (37) an abradable coating (15) tenaciously adhered to said at least the one land (36) effective to create and sustain substantially zero clearance with the fluid bathed cylinder wall and a heat sink in the form of at least one of (i) heat conductors (23) in the coating to conduct heat from the land (36) and (ii) a piston body interior (52) effective to receive a heat conducting fluid (26) moving along the interior to extract heat therefrom. The abradable coating comprises solid lubricants at least two of which are selected from the group consisting of graphite, molydisulphide and boron nitride The heat conductors in the coating preferably consist of copper particles distributed throughout the coating and constitute at least 70-90% by weight of the abradable coating.

REFERENCES:
patent: 2492935 (1949-12-01), McCulloch et al.
patent: 3189010 (1965-06-01), Isley
patent: 3759148 (1973-09-01), Geffroy
patent: 4656711 (1987-04-01), Yagi et al.
patent: 4899702 (1990-02-01), Sasaki et al.

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