Back to results
US 5,729,822 AGranted
Gears
AssigneeStackpole Limited
InventorsRohith Shivanath, Peter Jones
Life of this patent
Estimating the term…
Abstract
A powder metal gear wheel having a core density of at least 7.3 g/cc, and in one embodiment 7.4 to 7.6 g/cc and a hardened carburized surface. A method of manufacturing transmission gears comprises, sintering a powder metal blank to produce a core density of between 7.4 to 7.6 g/cc, rolling the surface of the gear blank to densify the surface, and then heating the rolled sintered part and carburizing in a vacuum furnace.
Claims7
A powder metal gear wheel having a core density of at least 7.3 g/cc and a hardened carburized surface.
A method of manufacturing a powder metal gear which comprises the steps of
- a) sintering a powder metal gear to produce a core density of approximately between 7.4 to 7.6 g/cc;
- b) rolling the surface of the sintered powder metal to densify the surface;
- c) heating the rolled sintered gear and carburizing in a vacuum furnace.
Dependencies are inferred from the claim text.