US3916569A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods of and means for producing helically toothed gears
Assignee: Maag Gear Wheel and Machine Co Ltd
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Filing: 1974-03-21
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Granted: 1975-11-04
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Expires: 1994-03-21
Abstract
Abstract A helically toothed internal involute gear is produced by the gear generating process with cutting strokes of a grinding wheel being made substantially in the direction of the gear face width, such that an active grinding point of the tool follows a straight generating line, and generating and feed displacements between the gear and the tool being made substantially in the direction of the tooth depth. Means are provided for automatically modifying cutting strokes of the tool along paths leading into the tooth root by deflecting the tool immediately before the root surface is reached.
Inventors
- 👤 Robert Wydler
- 👤 Gerd R Sommer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:22
CPC Classifications
B; B23; B23F; B23F5/00; B23F5/02; B23F5/06
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
107 words
A method for producing a helically toothed internal involute gear by the generating process employing longitudinal grinding techniques comprising the steps of effecting relative movement between a grinding tool and said gear substantially in the direction of the tooth depth for generating and feed displacements, effecting grinding strokes with said tool substantially along the direction of the gear face width by guiding said tool along a path that causes an active grinding point of said tool to follow a straight generatrix of the invoLute helical tooth surface, and deflecting said tool from said path in a predetermined manner immediately before the tool reaches the tooth root surface.
Claim 2
Independent Claim
107 words
A method for producing a helically toothed internal involute gear by the generating process employing longitudinal grinding techniques comprising the steps of effecting relative movement between a grinding tool and said gear substantially in the direction of the tooth depth for generating and feed displacements, effecting grinding strokes with said tool substantially along the direction of the gear face width by guiding said tool along a path that causes an active grinding point of said tool to follow a straight generatrix of the invoLute helical tooth surface, and deflecting said tool from said path in a predetermined manner immediately before the tool reaches the tooth root surface.
Claim 3
Dependent Claim
24 words
A method according to claim 1 wherein said deflection of said tool is obtained by displacing said tool outwardly of said straight generatrix path.
Claim 4
Dependent Claim
68 words
A method according to claim 1 wherein a pair of grinding tools are employed to simultaneously grind opposite flanks of a pair of spaced teeth of said gear, said pair of grinding tools being employed to effect simultaneous grinding strokes with the individual ones of said tools being deflected independently of each other as each approaches the root surfaces of a tooth being ground by said respective tool.
Claim 5
Dependent Claim
141 words
Apparatus for producing a helically toothed internal involute gear by the generating process employing longitudinal grinding techniques comprising a grinding tool, a slide carrying said tool, a support for said gear locating said gear relative to said slide, means for displacing the tool on said slide to perform cutting strokes on said gear substantially in the direction of the gear face width, relative movement means between said slide and said gear support for providing generating and feed displacements of said gear relative to said tool, said tool being thereby guided along a path causing an active grinding point of said tool to follow a straight generatrix of the involute helical tooth surface, and control means operable on said relative movement means to deflect said tool from said path in a predetermined manner immediately before said tool reaches the tooth root surface.
Claim 6
Dependent Claim
141 words
Apparatus for producing a helically toothed internal involute gear by the generating process employing longitudinal grinding techniques comprising a grinding tool, a slide carrying said tool, a support for said gear locating said gear relative to said slide, means for displacing the tool on said slide to perform cutting strokes on said gear substantially in the direction of the gear face width, relative movement means between said slide and said gear support for providing generating and feed displacements of said gear relative to said tool, said tool being thereby guided along a path causing an active grinding point of said tool to follow a straight generatrix of the involute helical tooth surface, and control means operable on said relative movement means to deflect said tool from said path in a predetermined manner immediately before said tool reaches the tooth root surface.
Claim 7
Dependent Claim
23 words
Apparatus according to claim 4 wherein said control means are arranged to cause deflection of said tool outwardly of said straight generatrix path.
Claim 8
Dependent Claim
50 words
Apparatus according to claim 4 comprising pivot means between the tool and the slide for performing said deflection of the tool by a rotary movement of the tool on the slide, said pivot means having an axis oriented obliquely to the direction of the translational component of the generating displacements.
Claim 9
Dependent Claim
46 words
Apparatus according to claim 4 further comprising position indicating means responsive to the cutting stroke movements and to the generating displacements, and means for receiving response signals to said movements and displacements from the indicating means for actuating said deflection of the tool in dependence thereto.
Claim 10
Dependent Claim
64 words
Apparatus according to claim 4 comprising two grinding tools for grinding simultaneously opposite flanks of two spaced teeth of the gear, said slide carrying both said tools for making cutting strokes with both tools together, said control means being operable for deflection of the respective tools independently of each other as each approaches the root surface of the tooth being cut by the tool.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-03 | 1979-05-05 | 1979-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-03 | 1983-05-05 | 1983-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-03 | 1987-05-05 | 1987-11-04 | $7700.00 | Window Closed / Lapsed |