US4640149A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High profile contact ratio, non-involute gear tooth form and method
Assignee: Boeing Co
•
Filing: 1983-03-04
•
Granted: 1987-02-03
•
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 08:32
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.
References Cited (Backward Citations)
US1525642A
Cited
US1647191A
Cited
US1977749A
Cited
US2128815A
Cited
US2737854A
Cited
GB843630A
Cited
US3251236A
Cited
US3631736A
Cited
US3982445A
Cited
US4276785A
Cited
SU992863A1
Cited
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 |