US3881364A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low noise gearing
Assignee: Individual
•
Filing: 1974-03-22
•
Granted: 1975-05-06
•
Expires: 1994-03-22
Abstract
Abstract A system of gearing that reduces noise to the lowest possible level without sacrifice of torque capacity. This is accomplished by utilizing circular arc profiles of specified radius such that the tooth root bending stresses never exceed the surface stresses no matter how fine the teeth are. The exceptionally large number of contact points resulting from the use of such fine teeth reduces the noise level to the minimum.
Inventors
- 👤 William S Rouverol
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:04
CPC Classifications
F; F16; F16H; F16H55/00; F16H55/02; F16H55/08; F16H57/00; F16H57/0006; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19949; Y10T74/19963; Y10T74/19972
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
52 words
In a pair of mating gears, teeth having a profile radius coefficient of less than unity, a pressure angle of less than 40* in planes perpendicular to the pitch line of said pair, an addendum height greater than 0.5 divided by the diametral pitch, and a tooth utilization ratio of substantially unity.
Claim 2
Dependent Claim
52 words
In a pair of mating gears, teeth having a profile radius coefficient of less than unity, a pressure angle of less than 40* in planes perpendicular to the pitch line of said pair, an addendum height greater than 0.5 divided by the diametral pitch, and a tooth utilization ratio of substantially unity.
Claim 3
Dependent Claim
22 words
A pair of mating gears according to claim 1 wherein the profile radius coefficient is equal to the critical profile radius coefficient.
Claim 4
Dependent Claim
34 words
A pair of mating gears according to claim 1 wherein said teeth are formed to extend across the rims of said gears at an angle with respect to the pitch line of said pair.
Claim 5
Dependent Claim
34 words
A pair of mating gears according to claim 2 wherein said teeth are formed to extend across the rims of said gears at an angle with respect to the pitch line of said pair.
Claim 6
Dependent Claim
31 words
A pair of mating gears according to claim 1 wherein the profiles of said teeth in planes perpendicular to said pitch line on one of said pair are substantially circular arcs.
Claim 7
Dependent Claim
31 words
A pair of mating gears according to claim 2 wherein the profiles of said teeth in planes perpendicular to said pitch line on one of said pair are substantially circular arcs.
Claim 8
Dependent Claim
30 words
A pair of mating gears according to claim 3 wherein the profiles of said teeth in planes normal to said teeth on one of said gears are substantially circular arcs.
Claim 9
Dependent Claim
30 words
A pair of mating gears according to claim 4 wherein the profiles of said teeth in planes normal to said teeth on one of said gears are substantially circular arcs.
Claim 10
Dependent Claim
33 words
A pair of mating gears according to claim 1 wherein the pressure angle at the pitch circle of one of said pair is slightly larger than that of the other of said pair.
Claim 11
Dependent Claim
33 words
A pair of mating gears according to claim 2 wherein the pressure angle at the pitch circle of one of said pair is slightly larger than that of the other of said pair.
Claim 12
Dependent Claim
28 words
A pair of mating gears according to claim 1 wherein the addendum of one of said pair is longer than the addendum of the other of said pair.
Claim 13
Dependent Claim
28 words
A pair of mating gears according to claim 2 wherein the addendum of one of said pair is longer than the addendum of the other of said pair.
Claim 14
Dependent Claim
26 words
A pair of mating gears according to claim 1 wherein the diametral pitch is between one-tenth and one-half the reciprocal of the effective center distance variation.
Claim 15
Dependent Claim
26 words
A pair of mating gears according to claim 2 wherein the diametral pitch is between one-tenth and one-half the reciprocal of the effective center distance variation.
Claim 16
Dependent Claim
24 words
A pair of mating gears according to claim 1 wherein the number of teeth on the smaller of said pair is greater than 50.
Claim 17
Dependent Claim
24 words
A pair of mating gears according to claim 2 wherein the number of teeth on the smaller of said pair is greater than 50.
Claim 18
Dependent Claim
33 words
A pair of mating gears according to claim 1 wherein the lengthwise direction of said teeth makes an angle of at least 60* with a line connecting opposite corners of the contact zone.
Claim 19
Dependent Claim
33 words
A pair of mating gears according to claim 2 wherein the lengthwise direction of said teeth makes an angle of at least 60* with a line connecting opposite corners of the contact zone.
Claim 20
Dependent Claim
17 words
A pair of mating gears according to claim 1 wherein the diametral pitch is greater than 30.
Claim 21
Dependent Claim
17 words
A pair of mating gears according to claim 2 wherein the diametral pitch is great than 30.
Claim 22
Dependent Claim
21 words
A pair of mating gears according to claim 1 wherein the pressure angle in the normal plane is greater than 25*.
Claim 23
Dependent Claim
21 words
A pair of mating gears according to claim 2 wherein the pressure angle in the normal plane is greater than 25*.
Claim 24
Dependent Claim
18 words
A pair of mating gears according to claim 1 wherein the profile radius coefficient is greater than 0.5.
Claim 25
Dependent Claim
18 words
A pair of mating gears according to claim 2 wherein the profile radius coefficient is greater than 0.5.
Claim 26
Dependent Claim
18 words
A pair of mating gears according to claim 1 wherein the profile radius coefficient is less than 0.9.
Claim 27
Dependent Claim
18 words
A pair of mating gears according to claim 2 wherein the profile radius coefficient is less than 0.9.
References Cited (Backward Citations)
US3824873A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-05 | 1978-11-04 | 1979-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-05 | 1982-11-04 | 1983-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-05 | 1986-11-04 | 1987-05-06 | $7700.00 | Window Closed / Lapsed |