US5405299A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Toothed belt and toothed belt-adapted pulley
Assignee: Bridgestone Corp
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Filing: 1993-12-17
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Granted: 1995-04-11
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Expires: 2013-12-17
Abstract
Abstract A toothed belt and belt-adapted pulley system provides a high-load capacity and increased durability by reducing stress concentrations on dedendum portions and further preventing localized bending of belt tensile cords. Smooth engagement of elastic teeth of a belt is possible due to minimization of interference between the elastic teeth upon engagement or disengagement with a pulley. Reduced vibration, low noise, and a reduction in skipping under high loads result from the inventive system. Each tooth of the belt has a peripheral length m 0 and a dedendum portion with a length m 1 , where m 1 /m 0 is 0.1 or less. Each tooth of the pulley has a peripheral length n 0 and a dedendum portion having a length n 1 , where n 1 /n 0 is 0.1 or less.
Inventors
- 👤 Takaharu Kubo
- 👤 Reiji Sato
- 👤 Takeshi Oba
- 👤 Akira Nakaegawa
- 👤 Yoshihide Fukahori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:37
CPC Classifications
F; F16; F16G; F16G1/00; F16G1/28; F16H; F16H7/00; F16H7/02; F16H7/023
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
140 words
A toothed belt wrapped around a plurality of toothed pulleys and having a plurality of elastic teeth which engage teeth of said toothed pulleys, said toothed belt comprising: a back rubber portion and tensile cords; each of said elastic teeth having a tooth depth equal to or less than a depth of each tooth space of said toothed pulleys; each of said elastic teeth further comprising a dedendum portion of substantially curvilinear cross-section; and each of said elastic teeth having an overall cross-sectional peripheral length, m 0 , at one pitch and each dedendum portion having a linear length portion, m 1 , where m 1 /m 0 is 0.1 or less, each of said elastic teeth further having a cross-sectional shape at one pitch formed by a smooth chain of arc portions which have two or more different radiuses.
Claim 2
Dependent Claim
140 words
A toothed belt wrapped around a plurality of toothed pulleys and having a plurality of elastic teeth which engage teeth of said toothed pulleys, said toothed belt comprising: a back rubber portion and tensile cords; each of said elastic teeth having a tooth depth equal to or less than a depth of each tooth space of said toothed pulleys; each of said elastic teeth further comprising a dedendum portion of substantially curvilinear cross-section; and each of said elastic teeth having an overall cross-sectional peripheral length, m 0 , at one pitch and each dedendum portion having a linear length portion, m 1 , where m 1 /m 0 is 0.1 or less, each of said elastic teeth further having a cross-sectional shape at one pitch formed by a smooth chain of arc portions which have two or more different radiuses.
Claim 3
Dependent Claim
42 words
A toothed belt according to claim 1 wherein: each of said elastic teeth has a tooth depth, h 0 ; and said back rubber portion has a thickness, h 2 , said ratio of h 2 /h 0 equaling 0.5 or less.
Claim 4
Dependent Claim
51 words
A toothed belt according to claim 1 wherein: an angle, θ, defined between a tangent, which extends through an inflection point of said elastic tooth and a line extending in a direction perpendicular to a pitch line through said inflection point, where θ lies within the range of 5° to 30°.
Claim 5
Dependent Claim
40 words
A toothed belt according to claim 1 wherein: each of said teeth has a depth, h 0 , and a tooth width, w 0 , where the ratio h 0 /w 0 is within the range of 0.35 to 0.75.
Claim 6
Dependent Claim
52 words
A toothed belt according to claim 1 wherein: each of said elastic teeth has a depth, h 0 , and a distance between an inflection point and a land line of said elastic tooth, h 1 , where the ratio h 1 /h 0 is within the range of 0.2 to 0.5.
Claim 7
Dependent Claim
165 words
A toothed belt-adapted pulley having a plurality of teeth around which a toothed belt is trained, said toothed belt having a plurality of elastic teeth of which root portions have substantially curvilinear cross-sections, said toothed belt-adapted pulley comprising: addendum portions of each of said teeth of said pulley, each portion having a curvilinear cross-section; each tooth of said pulley having a tooth space with a depth equal to, or greater than, a tooth depth of each one of said plurality of elastic teeth to be engaged therewith; and each of said teeth of said pulley having an overall cross-sectional peripheral length at one pitch, n 0 , said addendum portion having a length, n 1 , defined by the intersection of, a tip circle where the ratio n 1 /n 0 is 0.1 or less, each of said teeth of said pulley further having a cross-sectional shape at one pitch formed by a smooth chain or arc portions which have two or more different radiuses.
Claim 8
Dependent Claim
165 words
A toothed belt-adapted pulley having a plurality of teeth around which a toothed belt is trained, said toothed belt having a plurality of elastic teeth of which root portions have substantially curvilinear cross-sections, said toothed belt-adapted pulley comprising: addendum portions of each of said teeth of said pulley, each portion having a curvilinear cross-section; each tooth of said pulley having a tooth space with a depth equal to, or greater than, a tooth depth of each one of said plurality of elastic teeth to be engaged therewith; and each of said teeth of said pulley having an overall cross-sectional peripheral length at one pitch, n 0 , said addendum portion having a length, n 1 , defined by the intersection of, a tip circle where the ratio n 1 /n 0 is 0.1 or less, each of said teeth of said pulley further having a cross-sectional shape at one pitch formed by a smooth chain or arc portions which have two or more different radiuses.
Claim 9
Dependent Claim
207 words
In combination, a toothed belt and a toothed belt-adapted pulley comprising: a toothed belt wrapped around a plurality of toothed pulleys, said belt comprising a plurality of elastic teeth which engage with teeth of said toothed pulleys; each of said elastic teeth having a depth equal to or less than a depth of each tooth space of said toothed pulleys; each of said elastic teeth further comprising a dedendum portion having a substantially curvilinear cross-section, each of said elastic teeth having an overall cross-sectional peripheral length, m 0 , at one pitch and a dedendum portion having a linear length, m 1 , where the ratio m 1 /m 0 is 0.1 or less; each of said pulleys comprising a plurality of teeth; each of said pulleys further comprising an addendum portion having a curvilinear cross-section, each tooth space of said pulley having a depth equal to or greater than said tooth depth of said elastic tooth to be engaged therewith; each tooth of said pulley having an overall cross-sectional peripheral length, n 0 , at one pitch, and each addendum portion having a length, n 1 , defined by the intersection of a tip circle where the ratio n 1 /n 0 is 0.1 or less.
Claim 10
Dependent Claim
207 words
In combination, a toothed belt and a toothed belt-adapted pulley comprising: a toothed belt wrapped around a plurality of toothed pulleys, said belt comprising a plurality of elastic teeth which engage with teeth of said toothed pulleys; each of said elastic teeth having a depth equal to or less than a depth of each tooth space of said toothed pulleys; each of said elastic teeth further comprising a dedendum portion having a substantially curvilinear cross-section, each of said elastic teeth having an overall cross-sectional peripheral length, m 0 , at one pitch and a dedendum portion having a linear length, m 1 , where the ratio m 1 /m 0 is 0.1 or less; each of said pulleys comprising a plurality of teeth; each of said pulleys further comprising an addendum portion having a curvilinear cross-section, each tooth space of said pulley having a depth equal to or greater than said tooth depth of said elastic tooth to be engaged therewith; each tooth of said pulley having an overall cross-sectional peripheral length, n 0 , at one pitch, and each addendum portion having a length, n 1 , defined by the intersection of a tip circle where the ratio n 1 /n 0 is 0.1 or less.
Claim 11
Dependent Claim
115 words
A combination of a toothed belt and a toothed belt-adapted pulley according to claim 7 wherein: a circle centered at a revolving shaft of said pulley and extending through inflection points A p , E p , and I p of said pulley is spaced apart from a pulley tip circle by a distance h p , and a circle centered at said revolving shaft of said pulley and extending through inflection points J b and K b at a tooth portion of said toothed belt is spaced apart from said pulley tip circle by a distance h b , Q p is defined as (h p -h b )/h b where -0.3≦Q p ≦0.5.
Claim 12
Dependent Claim
115 words
A combination of a toothed belt and a toothed belt-adapted pulley according to claim 7 wherein: a circle centered at a revolving shaft of said pulley and extending through inflection points A p , E p , and I p of said pulley and an addendum portion or said dedendum portion of said elastic tooth of said toothed belt intersect at a point L p , and arc portions between A p and E p and between A p and L p on said circle have respective lengths of r 0 and r 1 , backlash R between said elastic tooth and said pulley is defined as (r 0 -r 1 )/r 0 where R≦0.20.
References Cited (Backward Citations)
JPS5220629A
Cited
GB1558766A
Cited
JPS5629141A
Cited
JPS5637457A
Cited
JPS571714A
Cited
JPS5751589A
Cited
US4586915A
Cited
US4915674A
Cited
US4929221A
Cited
US4993998A
Cited
US4878886A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-04-10 | 1998-10-10 | 1999-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-04-10 | 2002-10-10 | 2003-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-04-10 | 2006-10-10 | 2007-04-11 | $7700.00 | Window Closed / Lapsed |