Patent US3890118A successfully refreshed from Google Patents.
US3890118A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of grinding gears
Assignee: Nissan Motor Co Ltd
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Filing: 1973-10-18
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Granted: 1975-06-17
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Expires: 1993-10-18
Abstract
Abstract Concave and convex side tooth surfaces of longitudinally curved gear teeth are separately ground by relatively small and large dished grinding wheels inclined at acute angles to planes tangent to the pitch surfaces of the teeth being ground. Indexing operations are performed to allow the maximum radii of the small and large wheels to be as respectively small and large as possible and still allow clearance between the wheels and adjacent tooth surfaces.
Inventors
- 👤 Koichi Takahashi
- 👤 Nobuteru Hitomi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:50
CPC Classifications
B; B23; B23F; B23F21/00; B23F21/02; B23F21/023; B23F23/00; B23F23/12; B23F23/1237; B23F23/1268; B23F9/00; B23F9/02; B23F9/025
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
252 words
A method of grinding the tooth surfaces of gears with circular teeth, comprising the steps of applying an internal grinding conic surface of a truncated cone shaped grinding wheel of cup-like hollow construction to a circular arc shaped, convexly curved tooth trace of the gear, said grinding wheel having a cone in which said grinding conic surface forms a part thereof, said tooth trace having a cone in which said tooth trace forms a part of a circle forming an intersection of said cone and a plane perpendicular to a central axis of said cone, said grinding wheel being disposed on a central axis of said cone thereof in inclined and intersecting relationship to said central axis of said cone of said tooth trace, said grinding wheel being disposed in such a manner that a generatrix of said cone thereof always coincides with a generatrix of said cone of said tooth trace, said grinding conic surface having a radius of curvature which makes a maximum difference between said radius of curvature and a radius of curvature of said tooth trace within a range in which there occurs no geometrical interference of an external surface of said grinding wheel with a concavely curved tooth trace located opposedly adjacent to said convexly curved tooth trace to be ground, rotating said grinding wheel around said central axis of said cone thereof for grinding of said tooth trace, revolving said grinding wheel around said central axis of said cone of said tooth trace for grinding thereof.
Claim 2
Independent Claim
252 words
A method of grinding the tooth surfaces of gears with circular teeth, comprising the steps of applying an internal grinding conic surface of a truncated cone shaped grinding wheel of cup-like hollow construction to a circular arc shaped, convexly curved tooth trace of the gear, said grinding wheel having a cone in which said grinding conic surface forms a part thereof, said tooth trace having a cone in which said tooth trace forms a part of a circle forming an intersection of said cone and a plane perpendicular to a central axis of said cone, said grinding wheel being disposed on a central axis of said cone thereof in inclined and intersecting relationship to said central axis of said cone of said tooth trace, said grinding wheel being disposed in such a manner that a generatrix of said cone thereof always coincides with a generatrix of said cone of said tooth trace, said grinding conic surface having a radius of curvature which makes a maximum difference between said radius of curvature and a radius of curvature of said tooth trace within a range in which there occurs no geometrical interference of an external surface of said grinding wheel with a concavely curved tooth trace located opposedly adjacent to said convexly curved tooth trace to be ground, rotating said grinding wheel around said central axis of said cone thereof for grinding of said tooth trace, revolving said grinding wheel around said central axis of said cone of said tooth trace for grinding thereof.
Claim 3
Dependent Claim
268 words
A method as claimed in claim 1, further comprising the steps of applying an external grinding conic surface of a truncated cone shaped second grinding wheel of cup-like hollow construction to a circular arc shaped, concavely curved tooth trace of the gear, said second grinding wheel having a cone in which said external grinding conic surface forms a part thereof, said concavely curved tooth trace having a cone in which said concavely curved tooth trace forms a part of a circle forming an intersection of said cone and a plane perpendicular to a central axis of said cone, said second grinding wheel being disposed on a central axis of said cone thereof in inclined and intersecting relationship to said central axis of said cone of said concavely curved tooth trace, said second grinding wheel being disposed in such a manner that a generatrix of said cone thereof always concides with a generatrix of said cone of said concavely curved tooth trace, said external grinding conic surface having a radius of curvature which makes a maximum difference between said radius of curvature and a radius of curvature of said concavely curved tooth trace within a range in which there occurs no geometrical interference of an internal surfacE of said second grinding wheel with a convexly curved tooth trace located opposedly adjacent to said concavely curved tooth trace to be ground, rotating said second grinding wheel around said central axis of said cone thereof for grinding of said concavely curved tooth trace, revolving said second grinding wheel around said central axis of said concavely curved tooth trace for grinding thereof.
Claim 4
Dependent Claim
55 words
A method as claimed in claim 2, in which said second grinding wheel is displaceable on said central axis of and in the direction of said central axis of said cone thereof to enable said second grinding wheel to have an external grinding conic surface having a radius of curvature which makes said maximum difference.
Claim 5
Dependent Claim
47 words
A method as claimed in claim 2, in which said second grinding wheel is displaceable parallel to said central axis of said cone thereof to enable said second grinding wheel to have an external grinding conic surface having a radius of curvature which makes said maximum difference.
Claim 6
Dependent Claim
63 words
A method as claimed in claim 2, in which variable is an angle of inclination of said central axis of said cone of said second grinding wheel with said central axis of said cone of said concavely curved tooth trace to enable said second grinding wheel to have an external grinding conic surface having a radius of curvature which makes said maximum difference.
Claim 7
Dependent Claim
53 words
A method as claimed in claim 5, in which said grinding wheel is displaceable on said central axis of and in the direction of said central axis of said cone thereof to enable said grinding wheel to have an internal grinding conic surface having a radius of curvature which makes said maximum difference.
Claim 8
Dependent Claim
41 words
A method as claimed in claim 5, in which said grinding wheel is displaceable parallel to said cone thereof to enable said grinding wheel to have an internal grinding conic surface having a radius of curvature which makes said maximum difference.
Claim 9
Dependent Claim
59 words
A method as claimed in claim 1, in which variable is an angle of inclination of said central axis of said cone of said grinding wheel with said central axis of said cone of said tooth trace to enable said grinding wheel to have an internal grinding conic surface having a radius of curvature which makes said maximum difference.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-16 | 1978-12-16 | 1979-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-16 | 1982-12-16 | 1983-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-16 | 1986-12-16 | 1987-06-17 | $7700.00 | Window Closed / Lapsed |