Method for assembling and hardening a ball plug in a counterbore of a fuel injector nozzle assembly
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United States of America Patent
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Jan 20, 2004
Grant Date -
Jan 1, 2004
app pub date -
Jun 26, 2002
filing date -
Jun 26, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
According to the method of the present invention, the ball plug is press fit into the counterbored passage of a fuel injector nozzle assembly prior to hardening of the fuel injector nozzle assembly. A core hardening and gas nitriding process is then applied to the assembly, causing the ball plug to expand and the passage diameter to shrink. This results in a greatly increased seal between the ball plug and the passage, and substantial elimination of the gaps experienced therebetween in prior art fuel injector nozzle assemblies.
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