Patent US3744330A successfully refreshed from Google Patents.
US3744330A
Expired / Lapsed
US
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Gearwheel adapted to drive a positive motion belt having elastic teeth
Assignee: Tsubakimoto Chain Co
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Filing: 1972-04-05
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Granted: 1973-07-10
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Expires: 1992-04-05
Abstract
Abstract A gear wheel is provided for engaging a positive motion belt in a power transmission device. The positive motion belt has elastic rectilinear teeth. The gear wheel is generated by a rectilinearly toothed gear cutter which has a cavity form having a pressure angle Phi , an effective cavity thickness L and a depth H of the following values when the pressure angle and effective thickness and height of the tooth on said belt are phi , l and h, respectively:
Inventors
- 👤 Y Sugimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:29
CPC Classifications
F; F16; F16H; F16H7/00; F16H7/02; F16H7/023; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19949; Y10T74/19963; Y10T74/19972
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
96 words
Improvement in a cavity or tooth form of a gearwheel engaging a rectilinearly toothed positive belt in a power transmission device, with said positive belt having elastic rectilinear teeth, characterized in that the gearwheel teeth are generated by a rectilinear tooth cutter having a pressure angle Phi and an effective tooth thickness L and a height H of the following value when a tooth on the positive belt has a pressure angle phi and an effective tooth thickness l and a height h: Phi phi (0.3* * 5*) L (1.01 * 1.08)l H (1.05 * 1.15)h
Claim 2
Dependent Claim
96 words
Improvement in a cavity or tooth form of a gearwheel engaging a rectilinearly toothed positive belt in a power transmission device, with said positive belt having elastic rectilinear teeth, characterized in that the gearwheel teeth are generated by a rectilinear tooth cutter having a pressure angle Phi and an effective tooth thickness L and a height H of the following value when a tooth on the positive belt has a pressure angle phi and an effective tooth thickness l and a height h: Phi phi (0.3* * 5*) L (1.01 * 1.08)l H (1.05 * 1.15)h
Claim 3
Dependent Claim
105 words
In a positive motion belt transmission, a belt having rectilineal elastic teeth and a timing pulley having rectineal teeth engaged with the belt, the teeth of the belt having a pressure angle phi , an effective tooth thickness l and a tooth height h, the teeth on the timing pulley being generated by a rectilineal tooth-formed gear-cutting tool having a pressure angle Phi , an effective tooth thickness L and a tooth height H defined by the following values: Phi phi - (0.3* to 5*) L (1.01 to 1.08)l H (1.05 to 1.15)h said values being based on a curve derived from the following formulae:
Claim 4
Dependent Claim
105 words
In a positive motion belt transmission, a belt having rectilineal elastic teeth and a timing pulley having rectineal teeth engaged with the belt, the teeth of the belt having a pressure angle phi , an effective tooth thickness l and a tooth height h, the teeth on the timing pulley being generated by a rectilineal tooth-formed gear-cutting tool having a pressure angle Phi , an effective tooth thickness L and a tooth height H defined by the following values: Phi phi - (0.3* to 5*) L (1.01 to 1.08)l H (1.05 to 1.15)h said values being based on a curve derived from the following formulae:
Claim 5
Dependent Claim
64 words
Involute curve: r (Dg/2) . ev theta (ZMcos Phi /2) . ev theta where r a radius distance from the center of the pulley to the involute tooth-form line theta an angle formed by a line connecting the starting point of the involute curve on the base circle to a point on the involute curve on radius r and the center of the pulley
Claim 6
Dependent Claim
64 words
Involute curve: r (Dg/2) . ev theta (ZMcos Phi /2) . ev theta where r a radius distance from the center of the pulley to the involute tooth-form line theta an angle formed by a line connecting the starting point of the involute curve on the base circle to a point on the involute curve on radius r and the center of the pulley
Claim 7
Dependent Claim
40 words
Tooth height of the pulley H where M module of the rack Z number of the pulley''s teeth H'' depth from the tool''s pitch line to the bottom land t H'' - H a thickness of the tool''s tooth top
Claim 8
Dependent Claim
40 words
Tooth height of the pulley H where M module of the rack Z number of the pulley''s teeth H'' depth from the tool''s pitch line to the bottom land t H'' - H a thickness of the tool''s tooth top
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |