Scattered topography rolling of powered metal gears
AssigneeGM Global Technology Operations LLC
InventorsJason L. Austin, Dale A. Gerard
Life of this patent
Estimating the term…
Abstract
A method to form a gear for motor vehicles includes one or more of the following: placing a blank between a first tool member and a second tool member, each of the first tool member and the second tool member having a set of teeth; and moving the first tool member and the second tool member towards the blank while rotating the first tool member and the second tool member to form a gear with a set of teeth from the blank. Each tooth of the set of teeth has a topography that varies tooth-to-tooth.
Claims16
A method to form a gear for motor vehicles, the method comprising:
- placing a blank between a first tool member and a second tool member, each of the first tool member and the second tool member having a set of teeth, wherein each tooth of the sets of teeth of the first tool member and the second tool member has a topography with a corresponding micro-geometry shape parameter that varies tooth-to-tooth;
- and
- moving the first tool member and the second tool member towards the blank while rotating the first tool member and the second tool member to form a gear with a set of teeth from the blank by rolling and impart the topographies of each tooth of the sets of teeth of the first and second tool members to the set of teeth of the formed gear such that each tooth of the formed gear has a topography with a corresponding micro-geometry shape parameter that varies tooth-to-tooth, wherein a surface of each tooth of the set of teeth of the gear being formed is densified during the rotating of the first tool member and the second tool member.
A method to form a gear for motor vehicles, the method comprising:
- placing a blank between a first tool member and a second tool member, the blank being made of powdered metal, each of the first tool member and the second tool member having a set of teeth, wherein the set of teeth of the first tool member and the second tool member have topographies with micro-geometry shape parameters that vary tooth-to-tooth;
- and
- moving the first tool member and the second tool member towards the blank while rotating the first tool member and the second tool member to form a gear with a set of teeth from the blank by cold rolling and impart the topographies of the sets of teeth of the first and second tool members to the set of teeth of the formed gear such that the set of teeth of the formed gear has a scattered tooth-to-tooth topography with micro-geometry shape parameters that vary tooth-to-tooth,
- wherein a surface of each tooth of the set of teeth of the gear being formed is densified during the rotating of the first tool member and the second tool member to increase the hardness and strength of the surface of each tooth of the set of teeth of the formed gear.
Dependencies are inferred from the claim text.