US4140026A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conformal gearing
Assignee: Individual
•
Filing: 1977-02-25
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Granted: 1979-02-20
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Expires: 1997-02-25
Abstract
Abstract The principal disadvantage of conformal gearing is its acute sensitivity to center-distance error. An improved type of all-addendum conformal gearing is disclosed in which the concave tooth is much more flexible than the convex tooth, so that if the gears are mounted at too great a center-distance, the tendency of the tooth load to be exerted on the tip of the concave tooth is offset by tooth flexure which shifts the arc center of the concave profile a considerable distance toward the axis of the gear with convex teeth. This increases the pressure angle sufficiently to prevent overloading of the tip of the concave tooth.
Inventors
- 👤 William S. Rouverol
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 04:56
CPC Classifications
F; F16; F16H; F16H55/00; F16H55/02; F16H55/08; F16H55/14; F16H55/16; F16H2055/0893; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19633; Y10T74/19949; Y10T74/19963; Y10T74/19967; Y10T74/19972
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
86 words
In a pair of mating gears, a first gear having teeth formed to working profiles that are substantially convex circular arcs, a second gear having teeth formed to working profiles that are substantially concave circular arcs, said teeth of said second gear being made of a material having a particular modulus of elasticity and also having a ratio of whole depth to tooth thickness that together cause said teeth to bend under load at least three times as far as said teeth of said first gear.
Claim 2
Dependent Claim
86 words
In a pair of mating gears, a first gear having teeth formed to working profiles that are substantially convex circular arcs, a second gear having teeth formed to working profiles that are substantially concave circular arcs, said teeth of said second gear being made of a material having a particular modulus of elasticity and also having a ratio of whole depth to tooth thickness that together cause said teeth to bend under load at least three times as far as said teeth of said first gear.
Claim 3
Dependent Claim
31 words
A pair of mating gears according to claim 1 wherein the radii of said concave circular arcs are less than ten percent greater than the radii of said convex circular arcs.
Claim 4
Dependent Claim
32 words
A pair of mating gears according to claim 1 wherein the whole depth of the teeth on said second gear is substantially greater than that of the teeth of said first gear.
Claim 5
Dependent Claim
37 words
A pair of mating gears according to claim 3 wherein the whole depth of the teeth of said second gear includes the depth of a slot interposed between adjacent teeth to increase the flexibility of said teeth.
Claim 6
Dependent Claim
23 words
A pair of mating gears according to claim 4 wherein the profile of said slot is a curve of an approximately parabolic form.
Claim 7
Dependent Claim
20 words
A pair of mating gears according to claim 1 wherein said working profiles are circular arcs in the transverse plane.
Claim 8
Dependent Claim
23 words
A pair of mating gears according to claim 1 wherein said working profiles are circular arcs in planes normal to the tooth flanks.
Claim 9
Dependent Claim
26 words
A pair of mating gears according to claim 1 wherein the centers of said circular arcs are substantially at the common pitch element of said pair.
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) | 1982-02-19 | 1982-08-21 | 1983-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-19 | 1986-08-21 | 1987-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-19 | 1990-08-21 | 1991-02-20 | $7700.00 | Window Closed / Lapsed |