Appeal No. 96-3202
Application No. 08/183,464
adjusting shim 6. The portion 2 has a ring ridge part 7
surrounding the shim 6. Figure 22 is a partly enlarged3
sectional view of an aluminum alloy valve lifter body wherein
a sprayed coating 4 is shown as being impregnated and anchored
in the open porosity of the cylindrical portion 2.4
Rao discloses to decrease the friction between an
annular body 20 on a piston 13 and an opposing cylinder wall
12, a solid film lubricant coating 35 (see Figure 6)
containing either BN or MoS with graphite may be applied to
2
the cylinder wall. Rao teaches that this coating is comprised
of about 40% by weight of high temperature thermoplastic resin
such as polyarylsulfone, 40% graphite, and 20% of either MoS2
or BN. Rao further discloses that a resin that is thermally
stable up to about 700°F. is polymer 360, known as Astrel,
manufactured by Minnesota Mining and Manufacturing Company.
Rao teaches that after the cylinder wall surface is thoroughly
cleaned to remove any oxidation, such wall may be grit blasted
3See column 7, lines 23-35, of Shiraya.
4See column 7, lines 6-8, and column 16, lines 9-21, of
Shiraya.
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