Patent US4108017A successfully refreshed from Google Patents.
US4108017A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Standard-pitch gearing
Assignee: Individual
•
Filing: 1977-03-16
•
Granted: 1978-08-22
•
Expires: 1997-03-16
Abstract
Abstract Involute gearing can be optimized with respect to torque capacity only if the number of pinion teeth is standardized in a fairly narrow range, between about 15 and 40 teeth, depending on the tooth materials, pressure angle and gear ratio. The present invention discloses an alternative system of gearing that standardizes pitch instead of tooth numbers, so that pinions with several hundred teeth can be designed without sacrifice of any torque capacity relative to that of coarse-tooth involute gearing. The use of finer teeth reduces friction, heating and wear, but in particular helps to minimize operating noise.
Inventors
- 👤 William Spence Rouverol
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:29
CPC Classifications
F; F16; F16H; F16H55/00; F16H55/02; F16H55/08; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19949; Y10T74/19963; Y10T74/19972
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
92 words
In a pair of mating gears, teeth having working profiles in the transverse plane for which the radius of relative curvature at the pitch point is substantially smaller than the radius of relative curvature at the pitch point for involute gears of the same size and pressure angle, but greater than one and one-tenth tooth modules, the whole depth of the teeth of one of said pair being greater than two and six-tenths tooth modules, the tooth pitch angle in the transverse plane for neither of said pair being greater than 10°.
Claim 2
Dependent Claim
92 words
In a pair of mating gears, teeth having working profiles in the transverse plane for which the radius of relative curvature at the pitch point is substantially smaller than the radius of relative curvature at the pitch point for involute gears of the same size and pressure angle, but greater than one and one-tenth tooth modules, the whole depth of the teeth of one of said pair being greater than two and six-tenths tooth modules, the tooth pitch angle in the transverse plane for neither of said pair being greater than 10°.
Claim 3
Dependent Claim
33 words
A pair of mating gears according to claim 1 wherein the thickness of the dedendum portion of the teeth of at least one of said pair increases with distance from the pitch surface.
Claim 4
Dependent Claim
28 words
A pair of mating gears according to claim 2 wherein a portion of the profiles of the dedenda of said teeth are substantially segments of an exponential curve.
Claim 5
Dependent Claim
26 words
A pair of mating gears according to claim 1 wherein said radius of relative curvature is smaller than 80 percent of that of said involute gears.
Claim 6
Dependent Claim
28 words
A pair of mating gears according to claim 1 wherein said teeth are slantingly disposed with respect to an element common to the pitch surfaces of said pair.
Claim 7
Dependent Claim
29 words
A pair of mating gears according to claim 5 wherein the working portions of said teeth in planes normal to the flanks of said teeth are substantially circular arcs.
Claim 8
Dependent Claim
22 words
A pair of mating gears according to claim 1 wherein said pitch angle for neither of said pair is greater than 8°.
Claim 9
Dependent Claim
24 words
A pair of mating gears according to claim 1 wherein the working portions of said teeth in the transverse plane are substantially circular arcs.
Claim 10
Dependent Claim
77 words
A pair of mating gears according to claim 1 wherein said teeth have dedendum depths and dedendum thicknesses giving substantially the amount of bending deflection at said pitch point that will make the tooth contact areas on one of said pair tangent to the addendum surface of the other of said pair when said pair is subjected to torque load that produces a critical stress, as herein before defined, at at least one point in said tooth.
Claim 11
Dependent Claim
46 words
A pair of mating gears according to claim 9 wherein said teeth have a tooth module, tooth profile radii, module of elasticity and a pressure angle that make the tooth surface stresses and root stresses become critical stresses, as hereinfore defined, at the same torque load.
Claim 12
Dependent Claim
41 words
A pair of mating gears according to claim 1 wherein the clearance between the tips of the teeth on one of said pair and the roots of the teeth of the other of said pair is greater than 0.4 tooth modules.
Claim 13
Dependent Claim
17 words
A pair of mating gears according to claim 1 wherein the tooth module is smaller than 1.3.
Claim 14
Dependent Claim
27 words
A pair of mating gears according to claim 1 wherein the dedendum depth of the teeth of one of said pair is greater than 1.6 tooth modules.
Claim 15
Dependent Claim
28 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 two tooth modules.
Claim 16
Dependent Claim
40 words
A pair of mating gears according to claim 1 wherein the dedendum depth of the teeth of one of said pair added to that of the other of said pair gives a sum greater than three and two-tenths tooth modules.
Claim 17
Dependent Claim
25 words
A pair of mating gears according to claim 1 wherein said radius of relative curvature is smaller than 60% of that of said involute gears.
Claim 18
Dependent Claim
28 words
A pair of mating gears according to claim 1 wherein the pressure angle in planes normal to the tooth flanks at the pitch surface is smaller than 20°.
Claim 19
Dependent Claim
34 words
A pair of mating gears according to claim 1 wherein the active tooth surface of one of said pair comprises less than half its total tooth surface not including the addendum or root surfaces.
Claim 20
Dependent Claim
17 words
A pair of mating gears according to claim 1 wherein said pressure angle is smaller than 15°.
Claim 21
Dependent Claim
38 words
A pair of mating gears according to claim 1 wherein the whole depth of the teeth of one of said pair added to that of the other of said pair gives a sum greater than five tooth modules.
Claim 22
Dependent Claim
20 words
A pair of mating gears according to claim 20 wherein said sum is greater than five and one-half tooth modules.
Claim 23
Dependent Claim
18 words
A pair of mating gears according to claim 20 wherein said sum is greater than six tooth modules.
Claim 24
Dependent Claim
27 words
A pair of mating gears according to claim 1 wherein said radius of relative curvature of the teeth of said pair is larger than 1.25 tooth modules.
Claim 25
Dependent Claim
30 words
A pair of mating gears according to claim 1 wherein the teeth of one of said pair have a longer addendum than the teeth of the other of said pair.
Claim 26
Dependent Claim
32 words
A pair of mating gears according to claim 1 wherein the pressure angle for one of said pair at its pitch circle is larger than that of the other of said pair.
Claim 27
Dependent Claim
22 words
A pair of mating gears according to claim 1 wherein both of said pair have pitch circle diameters greater than fifteen millimeters.
Claim 28
Dependent Claim
22 words
A pair of mating gears according to claim 1 wherein the web of one of said pair is made of cast iron.
Claim 29
Dependent Claim
34 words
A pair of mating gears according to claim 1 wherein the dedendum depth of the teeth of one of said pair is greater than that of the teeth of the other of said pair.
Claim 30
Dependent Claim
26 words
A pair of mating gears according to claim 1 wherein said radius of relative curvature is smaller than 90 percent of that of said involute gears.
Claim 31
Dependent Claim
21 words
A pair of mating gears according to claim 1 wherein said whole depth is greater than two and three-quarters tooth modules.
Claim 32
Dependent Claim
22 words
A pair of mating gears according to claim 1 wherein said pitch angle for neither of said pair is greater than 6°.
References Cited (Backward Citations)
US3937098A
Cited
US4051492A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-08-21 | 1982-02-20 | 1982-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-08-21 | 1986-02-20 | 1986-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-08-21 | 1990-02-20 | 1990-08-22 | $7700.00 | Window Closed / Lapsed |