US3918315A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High capacity gearing
Assignee: Individual
•
Filing: 1974-07-22
•
Granted: 1975-11-11
•
Expires: 1994-07-22
Abstract
Abstract A type of gearing that significantly increases the torque capacity of high reduction gearing. This is accomplished by utilizing on the larger of a pair of mating gears a larger pressure angle than that of the smaller gear, and also in some cases a circular arc profile that has a shorter radius than that of an involute profile. The effect of these profile characteristics is to shift the principal tooth load away from the region where the line of action is tangent to the base circle of the smaller gear. Since this is the region where the relative radius of profile curvature is at a minimum, it is the place where tooth surface stresses tend to be a maximum. Relief of the surface stresses in this region therefore allows the gear set to carry greater torque without being subject to failure by surface pitting.
Inventors
- 👤 William S Rouverol
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:14
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: 21
Claim 1
Independent Claim
58 words
In a pair of mating gears comprising a larger gear and a smaller gear, teeth formed on said gears to be in contact at a point between the pitch line and the axis of said larger gear, the centers of curvature of the profile curves of said teeth at said point being substantially removed from said pitch line.
Claim 2
Dependent Claim
58 words
In a pair of mating gears comprising a larger gear and a smaller gear, teeth formed on said gears to be in contact at a point between the pitch line and the axis of said larger gear, the centers of curvature of the profile curves of said teeth at said point being substantially removed from said pitch line.
Claim 3
Dependent Claim
55 words
A pair of mating gears according to claim 1 wherein the relative radius of curvature of said profiles at said point in planes perpendicular to the pitch line is smaller than the sine of the pressure angle of said smaller gear divided by the sum of the reciprocals of the pitch radii of said gears.
Claim 4
Dependent Claim
25 words
A pair of mating gears according to claim 1 wherein the pressure angle of said larger gear is larger than that of said smaller gear.
Claim 5
Dependent Claim
31 words
A pair of mating gears according to claim 1 wherein the working profiles of the teeth of one of said gears in planes normal to the pitch line are circular arcs.
Claim 6
Dependent Claim
21 words
A pair of mating gears according to claim 1 wherein said teeth are slantingly disposed with respect to said pitch line.
Claim 7
Dependent Claim
31 words
A pair of mating gears according to claim 5 wherein the working profiles of the teeth of one of said gears in planes normal to the tooth direction are circular arcs.
Claim 8
Dependent Claim
18 words
A pair of mating gears according to claim 1 wherein said smaller gear has fewer than twelve teeth.
Claim 9
Dependent Claim
21 words
A pair of mating gears according to claim 1 wherein said smaller gear has working tooth profiles that are involute curves.
Claim 10
Dependent Claim
59 words
A pair of mating gears according to claim 1 wherein the culmination point of a pair of mating teeth is on the same side of the line of centers of said pair as the center of curvature of the working profiles of said larger gear when said pair of mating teeth are in contact on said line of centers.
Claim 11
Dependent Claim
28 words
A pair of mating gears according to claim 1 wherein the pressure angle of said smaller gear in planes normal to the tooth direction is greater than 20*.
Claim 12
Dependent Claim
37 words
A pair of mating gears according to claim 4 wherein the radius of said circular arc is less than the pitch radius of said larger gear times the sine of the pressure angle of said smaller gear.
Claim 13
Dependent Claim
22 words
A pair of mating gears according to claim 1 wherein the working profiles of the teeth of both gears are circular arcs.
Claim 14
Dependent Claim
23 words
A pair of mating gears according to claim 9 wherein said culmination point is adjacent to the addendum surface of said smaller gear.
Claim 15
Dependent Claim
25 words
A pair of mating gears according to claim 1 wherein the addendum coefficient of said smaller gear is greater than that of said larger gear.
Claim 16
Dependent Claim
33 words
A pair of mating gears according to claim 1 wherein the root thickness of the teeth on said smaller gear is greater than the root thickness of the teeth on said larger gear.
Claim 17
Dependent Claim
31 words
A pair of mating gears according to claim 1 wherein the ratio of the number of teeth on said larger gear to that on said smaller gear is greater than 4.
Claim 18
Dependent Claim
27 words
A pair of mating gears according to claim 1 wherein said teeth are formed to produce a contact area between mating teeth having a substantially elliptical boundary.
Claim 19
Dependent Claim
27 words
A pair of mating gears according to claim 17 wherein the center of said elliptical contact area is adjacent to the addendum circle of said smaller gear.
Claim 20
Dependent Claim
22 words
A pair of mating gears according to claim 17 wherein said contact area occupies substantially the full working depth of said teeth.
Claim 21
Dependent Claim
20 words
A pair of mating gears according to claim 1 wherein the transverse contact ratio is approximately equal to an integer.
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) | 1978-11-10 | 1979-05-12 | 1979-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-10 | 1983-05-12 | 1983-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-10 | 1987-05-12 | 1987-11-11 | $7700.00 | Window Closed / Lapsed |