US4121482A
Expired / Lapsed
US
⏱️ 0.0 years remaining
W-N gear having a maximum surface strength
Assignee: HASEGAWA HAGURUMA KK
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Filing: 1977-08-10
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Granted: 1978-10-24
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Expires: 1997-08-10
Abstract
Abstract A W-N gear which has a surface strength at least nearly maximized for a given addendum and minimum pressure angle is realized by selecting a mean radius for the convex and concave circular arcs of the tooth profile in an appropriate range. Also, a dual=line mesh W-N gear of the character described which has a requisite face width minimized is obtained by selecting a mean arc radius which lies in the range referred to above and enables the addendum and dedendum points of meshing contact to appear at equal angle intervals.
Inventors
- 👤 Shoichi Ishikawa
- 👤 Kiyoshi Kotake
- 👤 Seishi Honma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:26
CPC Classifications
F; F16; F16H; F16H55/00; F16H55/02; F16H55/08; F16H55/0826; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19949; Y10T74/19963; Y10T74/19972
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
72 words
A W-N gear having a basic rack tooth profile, taken in a normal or transverse reference plane, which has a mean radius, ρ, of inter-meshing convex and concave circular arcs selected in the range ##EQU22## where h k represents the addendum, γ the minimum pressure angle and e the Napierian log base, so that the surface strength is at least nearly maximized for the given values of addendum and minimum pressure angle.
Claim 2
Dependent Claim
72 words
A W-N gear having a basic rack tooth profile, taken in a normal or transverse reference plane, which has a mean radius, ρ, of inter-meshing convex and concave circular arcs selected in the range ##EQU22## where h k represents the addendum, γ the minimum pressure angle and e the Napierian log base, so that the surface strength is at least nearly maximized for the given values of addendum and minimum pressure angle.
Claim 3
Dependent Claim
91 words
A dual-line mesh W-N gear having such a basic tooth profile, taken in a normal reference plane, as to satisfy the following two approximation formulas simultaneously, ##EQU23## where m n represents the normal module, α n the normal pressure angle at the point of contact on the circular arcs, h k the addendum, γ the minimum pressure angle of the circular arcs, β the helix angle at the pitch diameter, ρ the mean radius of the addendum and dedendum circular arcs of the tooth profile and e the Napierian log base.
Claim 4
Dependent Claim
91 words
A dual-line mesh W-N gear having such a basic tooth profile, taken in a normal reference plane, as to satisfy the following two approximation formulas simultaneously, ##EQU23## where m n represents the normal module, α n the normal pressure angle at the point of contact on the circular arcs, h k the addendum, γ the minimum pressure angle of the circular arcs, β the helix angle at the pitch diameter, ρ the mean radius of the addendum and dedendum circular arcs of the tooth profile and e the Napierian log base.
References Cited (Backward Citations)
US3855874A
Cited
US4051745A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-10-23 | 1982-04-24 | 1982-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-23 | 1986-04-24 | 1986-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-23 | 1990-04-24 | 1990-10-24 | $7700.00 | Window Closed / Lapsed |