US4276785A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low-noise gearing
Assignee: Individual
•
Filing: 1979-11-16
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Granted: 1981-07-07
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Expires: 1999-11-16
Abstract
Abstract A gear tooth form is disclosed that maximizes the profile (transverse) contact ratio for coplanar axis gearing. As the tooth form allows teeth two or three times as fine as those of conventional involute gearing to be used without loss of torque capacity, the face (axial) contact ratio for helical or spiral bevel gearing is also maximized. The total contact ratio (profile plus face contact ratios) is therefore maximized, and the torque load is divided over the maximum number of teeth. This minimizes the transmission error, which in turn minimizes operating noise and vibration. The gearing employs a minimum pressure angle and a path of contact that includes a curved portion.
Inventors
- 👤 William S. Rouverol
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:47
CPC Classifications
F; F16; F16H; F16H55/00; F16H55/02; F16H55/08; F16H55/0806; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19949; Y10T74/19963; Y10T74/19972
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
61 words
A pair of mating gears that are not preloaded, are mounted on coplanar axes, and have conjugate teeth formed to make contact, when said gears are transmitting torque, over a transverse plane path of contact that affords a ratio of roll angle to pitch angle of at least 2.5, said path being non-straight and having an average pressure-angle smaller than 14°.
Claim 2
Dependent Claim
61 words
A pair of mating gears that are not preloaded, are mounted on coplanar axes, and have conjugate teeth formed to make contact, when said gears are transmitting torque, over a transverse plane path of contact that affords a ratio of roll angle to pitch angle of at least 2.5, said path being non-straight and having an average pressure-angle smaller than 14°.
Claim 3
Dependent Claim
23 words
A pair of mating gears according to claim 1 wherein the number of teeth on each of said gears is at least 30.
Claim 4
Dependent Claim
23 words
A pair of mating gears according to claim 1 wherein the number of teeth on each of said gears is at least 36.
Claim 5
Dependent Claim
25 words
A pair of mating gears according to claim 1 wherein said teeth are slantingly disposed with respect to the common pitch element of said pair.
Claim 6
Dependent Claim
16 words
A pair of mating gears according to claim 1 wherein said ratio is at least 2.75.
Claim 7
Dependent Claim
17 words
A pair of mating gears according to claim 1 wherein said average pressure-angle is smaller than 10°.
Claim 8
Dependent Claim
17 words
A pair of mating gears according to claim 1 wherein said average pressure-angle is smaller than 8°.
Claim 9
Dependent Claim
15 words
A pair of mating gears according to claim 1 wherein said path has an S-shape.
Claim 10
Dependent Claim
15 words
A pair of mating gears according to claim 1 wherein said path has a J-shape.
Claim 11
Dependent Claim
36 words
A pair of mating gears according to claim 1 wherein one of said pair is smaller than the other and said path has at least one segment that is concave toward said one of said pair.
Claim 12
Dependent Claim
21 words
A pair of mating gears according to claim 1 wherein said path includes a straight portion adjacent to the pitch point.
Claim 13
Dependent Claim
27 words
A pair of mating gears according to claim 1 wherein the whole depth of the teeth of one of said pair is greater than 2.6 tooth modules.
Claim 14
Dependent Claim
51 words
A pair of mating gears according to claim 1 wherein the transverse profiles of the teeth of one of said pair include a dedenum segment that lies between the working profile and the minimum radius root curve, said segment having a minimum radius of curvature of at least one tooth module.
Claim 15
Dependent Claim
26 words
A pair of mating gears according to claim 1 wherein the sum of the addendum heights of the teeth of said pair is greater than 2.0.
Claim 16
Dependent Claim
50 words
A pair of mating gears according to claim 1 wherein the normal to said path at one of its ends intersects the shortest line between the pitch point and the axis of one of said gears at a point four times closer to said axis than to said pitch point.
Claim 17
Dependent Claim
16 words
A pair of mating gears according to claim 1 wherein said teeth have unequal addendum heights.
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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) | 1984-07-06 | 1985-01-05 | 1985-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-07-06 | 1989-01-05 | 1989-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-07-06 | 1993-01-05 | 1993-07-07 | $7700.00 | Window Closed / Lapsed |