A sintered sprocket has a high overall density and excellent contact pressure
resistance.
The sprocket is produced from a sintered alloy selected from the following alloys
((1) to (3)), is densified to have a relative density of 95% or higher in the surface
layer of the gear teeth by forming by rolling, having a surface hardness of 700
HV or higher, and is useful for a crankshaft, a cam shaft, a balancer shaft, or
a water pump shaft of an internal combustion engine:
(1) an Fe—Mo—C based sintered alloy containing Mo at 1.0 to
2.0% by mass;
(2) an Fe—Mo—Ni—C based sintered alloy containing Mo at
more than 1.0 and not more than 2.0% by mass, and Ni at more than 1.0 and not more
than 2.5% by mass, or
(3) an Fe—Mo—Ni—Cu—C based sintered alloy containing
Mo at 0.3 to 1.0% by mass, Ni at not less than 1.5 to less than 3.0% by mass, and
Cu at 1.0 to 2.5% by mass.
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