Appeal No. 96-3374
Application No. 08/115,974
600°F. Rao further teaches that to permit such substances to
continue providing antifriction characteristics after such
breakdown, the supporting surface may be provided with
reservoirs 43 or grooves to capture or retain the solid film
lubricant coating 44, much in the manner of porosity.4
As shown in Figures 1 and 2, Hiraoka discloses that two
different liquid phase sinterable materials A and B are molded
into a green cam piece composed of outer and inner layers,
which are respectively formed out of the materials A and B.
Hiraoka teaches that the outer-layer forming material A is of
Fe-C-Ni-Cr-Mo system alloy which is prepared to have a
shrinkage of 8% with respect to the axial direction of a
camshaft. Hiraoka further teaches that the inner-layer
forming material B is of Fe-C-P or Fe-C-P-Mo system alloy
which is prepared to have a shrinkage of 4% with respect to
the axial direction. As shown in Figure 3, the green cam
piece is assembled to a steel shaft
4See column 6, lines 48-57, of Rao.
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