Patent US4744263A successfully refreshed from Google Patents.
US4744263A
Expired / Lapsed
US
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Face gear transmission
Assignee: NORMA BV
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Filing: 1986-12-01
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Granted: 1988-05-17
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Expires: 2006-12-01
Abstract
Abstract Face-gear transmissions have been used hitherto only for secondary applications, with little running hours and low loads. They form a type of underdeveloped angle transmissions. When analyzing said underdevelopment, it was surprisingly found that well-known gear theory had not been applied correctly. Especially the teeth-tip-height can be increased considerably in the region where the face-gear teeth have increased pressure angles, resulting in considerably increased loading capacity and meshing quotient, all based on meshing cooperation with standard cylindrical gears with either straight (spur) or helical teeth. The angle between the transmission shafts may be 90°, less or over, the shafts may intersect or cross. In case involute toothing is chosen for the cylindrical gear wheel, all well-known advantages remain valid, thus alignment of the transmission is considerably less critical than with bevelled transmissions, axial-pinion loads are less or absent, loading capacity is comparable or better and transmission ratios surpassing approximately 1:5 become the more attractive. In many cases less transmission steps will be possible, reducing size and cost. Simple replacement becomes possible, without any alignment problems. Face gear transmission now may be used for primary, high load, long-life industrial applications.
Inventors
- 👤 Hendrik Kuiken
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:48
CPC Classifications
F; F16; F16H; F16H55/00; F16H55/02; F16H55/08; F16H55/0806; F16H55/0813; F16H1/00; F16H1/02; F16H1/04; F16H1/12; F16H55/17; F16H2055/173; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19949; Y10T74/19963; Y10T74/19972
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
158 words
Face gear transmission comprising: a cylindrical gear wheel having a first axis, said cylindrical gear wheel engaging in substantially continuous line contact with a face gear having a second axis not parallel to said first axis; said face gear having a teeth crown, said teeth crown having active tooth flanks over an active pressure angle α varying as a function of teeth crown radius, the range of variation of said pressure angle being a range within the range of α=0° and approximately α=40°; said face gear teeth having an axial height varying as a function of pressure angle α and extending at least into a plane disposed on a pitch cone located about said second axis, said axial height decreasing substantially linearly from a nominal tooth height as the pressure angle α decreases, and said axial height increasing as the pressure angle α increases, said axial height increasing to a sharp tip point and then decreasing outwardly therefrom.
Claim 2
Dependent Claim
158 words
Face gear transmission comprising: a cylindrical gear wheel having a first axis, said cylindrical gear wheel engaging in substantially continuous line contact with a face gear having a second axis not parallel to said first axis; said face gear having a teeth crown, said teeth crown having active tooth flanks over an active pressure angle α varying as a function of teeth crown radius, the range of variation of said pressure angle being a range within the range of α=0° and approximately α=40°; said face gear teeth having an axial height varying as a function of pressure angle α and extending at least into a plane disposed on a pitch cone located about said second axis, said axial height decreasing substantially linearly from a nominal tooth height as the pressure angle α decreases, and said axial height increasing as the pressure angle α increases, said axial height increasing to a sharp tip point and then decreasing outwardly therefrom.
Claim 3
Dependent Claim
15 words
A face gear transmission as in claim 1 wherein said first and second axes intersect.
Claim 4
Dependent Claim
17 words
A face gear transmission as in claim 1 wherein said first and second axes intersect at 90°.
Claim 5
Dependent Claim
16 words
A face gear transmission as in claim 1 wherein said cylindrical gear wheel has straight teeth.
Claim 6
Dependent Claim
16 words
A face gear transmission as in claim 1 wherein said cylindrical gear wheel has helical teeth.
Claim 7
Dependent Claim
51 words
A face gear transmission as in claim 1 wherein said cylindrical gear has a standardized pressure angle α=20° and a transmission ratio i less than approximately 5-7, said axial tooth height increasing over the tooth width with a radius increasing from the inside until it becomes pointed and then immediately decreasing.
Claim 8
Dependent Claim
180 words
Face gear transmission comprising: a cylindrical gear wheel having a first axis, said cylindrical gear wheel engaging in substantially continuous line contact with a face gear having a second axis not parallel to said first axis; said face gear having a teeth crown, said teeth crown having active tooth flanks over an active pressure angle α varying as a function of teeth crown radius, the range of variation of said pressure angle being a range within the range of α=0° and approximately α=40°; wherein said cylindrical gear has a standardized pressure angle α=20° and a transmission ratio i of approximately greater than 5-7, said face gear teeth having an axial height varying as a function of pressure angle α and extending at least into a plane disposed on a pitch cone located about said second axis, said axial height decreasing substantially linearly from a nominal tooth height as the pressure angle α decreases, and said axial tooth height increasing to a maximum height determined by said engaging cylindrical gear wheel, then remaining constant until it becomes pointed and finally decreasing.
Claim 9
Dependent Claim
180 words
Face gear transmission comprising: a cylindrical gear wheel having a first axis, said cylindrical gear wheel engaging in substantially continuous line contact with a face gear having a second axis not parallel to said first axis; said face gear having a teeth crown, said teeth crown having active tooth flanks over an active pressure angle α varying as a function of teeth crown radius, the range of variation of said pressure angle being a range within the range of α=0° and approximately α=40°; wherein said cylindrical gear has a standardized pressure angle α=20° and a transmission ratio i of approximately greater than 5-7, said face gear teeth having an axial height varying as a function of pressure angle α and extending at least into a plane disposed on a pitch cone located about said second axis, said axial height decreasing substantially linearly from a nominal tooth height as the pressure angle α decreases, and said axial tooth height increasing to a maximum height determined by said engaging cylindrical gear wheel, then remaining constant until it becomes pointed and finally decreasing.
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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) | 1991-05-17 | 1991-11-16 | 1992-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-17 | 1995-11-16 | 1996-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-17 | 1999-11-16 | 2000-05-17 | $7700.00 | Window Closed / Lapsed |