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US 5,390,414 AGranted
Gear making process
AssigneeEaton Corporation
InventorBohdan Lisowsky
Life of this patent
Estimating the term…
Abstract
Method of manufacturing a helical gear allowing strategic placement of a hardenable wear-resistant and high strength layer at predetermined locations on the gear. The method includes the steps of forming a gear core preform having the general shape of the helical gear and positioning the gear core preform within an elastomeric mold having the specific shape of the helical gear. The method also includes the steps of filling the mold at the predetermined locations with the hardenable metallurgical material and densifying the gear core preform and the metallurgical material. Lastly, the method also includes the step of heat treating the densified gear core preform and metallurgical material, to obtain the helical gear having a wear-resistant layer at the predetermined locations. A helical gear formed according to method is also provided.
Claims24
A method of manufacturing a gear, the method comprising:
- fabricating an elastomeric gear core mold having the shape of the gear core preform;
- fabricating an elastomeric gear perform mold having the shape of the gear;
- filling the gear core mold with a powdered metal material;
- subjecting the gear core mold to high pressure to form the gear core preform;
- applying hardenable metallurgical material to the gear core preform at predetermined locations by positioning the gear core preform within the gear preform mold, filling the gear preform mold at the predetermined locations with the hardenable, metallurgical material, and densifying the gear core preform and the metallurgical material;
- and
- hardening the hardenable metallurgical material by heat treating the densified gear core preform and metallurgical material, to obtain the gear having a wear-resistant and high strength layer at the predetermined locations.
4 more elements
A method of manufacturing a helical gear, the method comprising:
- fabricating an elastomeric gear core mold having the shape of the gear core preform;
- fabricating an elastomeric gear preform mold having the specific shape of the helical gear;
- filling the gear core mold with a powdered metal material;
- subjecting the gear core mold to high pressure to form the gear core preform;
- positioning the gear core preform within the gear preform mold;
- filling the gear preform mold at the predetermined locations with a hardenable powdered metallurgical material;
- densifying the gear core preform and the hardenable powdered metallurgical material;
- and
- heat treating the densified gear core preform and the hardenable metallurgical material, to obtain the helical gear having a wear-resistant and high strength layer at the predetermined locations.
6 more elements
A method of manufacturing a helical gear, the method comprising:
- fabricating at least two models representing the helical gear, the first model representing a gear core, the second model representing the desired geometry of the helical gear;
- fabricating a gear core mold from the first model and an elastomeric mold having the specific shape of the helical gear from the second model;
- filling the gear core mold with a first powdered metallurgical material so as to form a gear core preform having the general shape of the gear by cold isostatically pressing the gear core mold filled with the first powdered metallurgical material;
- positioning the gear core preform within the elastomeric mold;
- filling the elastomeric mold at the predetermined locations with a hardenable powdered metallurgical material;
- densifying the gear core preform and the hardenable powdered metallurgical material;
- and
- heat treating the densified gear core preform and the hardenable metallurgical material, to obtain the helical gear having a wear-resistant and high strength layer at the predetermined locations.
5 more elements
A method of manufacturing a helical gear having a desired geometry, the method comprising:
- fabricating at least two models representing the helical gear, the first model representing a gear core, the second model representing the desired geometry of the gear;
- fabricating a gear core mold and an overall gear mold from the first model and the second model, respectively;
- filling the gear core mold with a first powdered metallurgical material so as to form a gear core preform having the general shape of the gear;
- positioning the gear core preform within the overall gear mold having the specific shape of the helical gear;
- applying a second powdered metallurgical material to the gear core preform at predetermined locations to obtain an overall gear preform having a layered structure at the predetermined locations;
- densifying the overall gear preform;
- and
- hardening the overall gear preform to obtain the gear with a wear-resistant layer at the predetermined locations.
5 more elements
A helical gear comprising:
- (1) a gear core formed by pressing a first powdered metallurgical material in an elastomeric mold, the gear core having the general geometry of the helical gear;
- and
- (2) a wear-resistant and high strength layer selectively positioned on the gear core at predetermined locations by
- (a) applying hardenable metallurgical material to the gear core preform at the predetermined locations;
- (b) densifying the gear core preform with the hardenable metallurgical material to obtain an overall gear preform;
- and
- (c) hardening the overall gear preform to obtain the gear with a wear-resistant and high-strength layer at the predetermined locations.
4 more elements
A helical gear comprising:
- (1) a gear core preform formed by
- (a) fabricating at least two models representing the helical gear, the first model representing a gear core, the second model representing the desired geometry of the gear;
- (b) fabricating a gear core mold and an overall gear mold from the first model and the second model, respectively;
- and
- (c) filling the gear core mold with a first powdered metallurgical material so as to form the gear core preform having the general shape of the gear;
- and
- (2) a wear-resistant and high strength layer selectively positioned on the gear core at predetermined locations by
- (d) positioning the gear core preform within the overall gear mold having the specific shape of the helical gear;
- (e) applying a second powdered metallurgical material to the gear core preform at predetermined locations to obtain an overall gear preform having a layered structure at the predetermined locations;
- (f) densifying the overall gear preform;
- and
- (g) hardening the overall gear preform to obtain the gear with a wear-resistant layer at the predetermined locations.
9 more elements
A method of manufacturing a gear, the method comprising:
- fabricating an elastomeric gear core mold having the shape of a gear core preform;
- filling the gear core mold with a powdered metal material;
- subjecting the gear core mold to high pressure to form the gear core preform having the general geometry of the gear;
- applying hardenable metallurgical material to the gear core preform at predetermined locations;
- and
- hardening the hardenable metallurgical material, to obtain the gear having a wear-resistant and high strength layer at the predetermined locations.
3 more elements
A method of manufacturing a helical gear, the method comprising:
- fabricating an elastomeric gear core mold having the shape of a gear core preform;
- filling the gear core mold with a powdered metal material;
- forming the gear core preform having the general shape of the helical gear by cold isostatically pressing the gear core mold filled with the powdered metallurgical material;
- positioning the gear core preform within an elastomeric mold having the specific shape of the helical gear;
- filling the elastomeric mold at the predetermined locations with a hardenable powdered metallurgical material;
- and
- hardening the hardenable metallurgical material, to obtain the gear having a wear-resistant and high strength layer at the predetermined locations.
4 more elements
Dependencies are inferred from the claim text.