Patent US4640149A successfully refreshed from Google Patents.
US4640149A
Expired / Lapsed
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High profile contact ratio, non-involute gear tooth form and method
Assignee: Boeing Co
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Filing: 1983-03-04
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Granted: 1987-02-03
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Expires: 2003-03-04
Abstract
Abstract A gear tooth which has a combination of an involute and a non-involute profile, and specifically a constant relative curvature and a high contact ratio, i.e., a contact ratio which is at least 2.
Inventors
- 👤 Raymond Drago
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:23
CPC Classifications
F; F16; F16H; F16H55/00; F16H55/02; F16H55/08; F16H55/0806; F16H55/088; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19949; Y10T74/19963; Y10T74/19972
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
41 words
A gear set comprising a pair of mating gears having conjugate gear teeth, the profile of said gear teeth having substantially constant relative curvature (CRC) at all points of contact and a high profile contact ratio (HCR) of at least 2.
Claim 2
Dependent Claim
41 words
A gear set comprising a pair of mating gears having conjugate gear teeth, the profile of said gear teeth having substantially constant relative curvature (CRC) at all points of contact and a high profile contact ratio (HCR) of at least 2.
Claim 3
Dependent Claim
24 words
The gear set as defined in claim 1, wherein the relative radius of curvature of the (CRC)-(HCR) profile increases for increasing relative roll angle.
Claim 4
Dependent Claim
37 words
The gear set as defined in claim 1, wherein the sliding velocity of the (CRC)-(HCR) profile is less than for a pair of mating gears having an involute profile and a contact ratio of at least 2.
Claim 5
Dependent Claim
37 words
The gear set as defined in claim 1, wherein the entraining velocity of the (CRC)-(HCR) profile is greater than for a pair of mating gears having an involute profile and a contact ratio of at least 2.
Claim 6
Dependent Claim
56 words
The gear set as defined in claim 1, wherein the profile is defined by the equations: ##EQU3## where: φ=pressure angle at the pitch contact point mp=contact ratio φ clc =roll angle at the last point of contact of the (CRC) profile θ cod =roll angle at the outside diameter of the (CRC) profile N=number of teeth.
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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) | 1990-02-02 | 1990-08-04 | 1991-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-02 | 1994-08-04 | 1995-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-02 | 1998-08-04 | 1999-02-03 | $7700.00 | Window Closed / Lapsed |