US3738187A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hunting-tooth timing bolt
Assignee: Individual
•
Filing: 1971-10-14
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Granted: 1973-06-12
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Expires: 1991-10-14
Abstract
Abstract A toothed belt or timing belt in a mechanical drive system, which has a number of teeth incommensurable with the numbers of teeth on the pulleys, and preferably a prime number. With this relationship, every tooth on the belt will, during operation, engage every tooth on a pulley in a progressive repeating series, thus equalizing wear and minimizing damage to the belt from repetitive engagement with any deformed or defective pulley tooth, e.g., one having a burr. The invention is useful in drive systems which necessarily have a simple ratio, such as the 2:1 ratio between the crankshaft and camshaft of an internal combustion engine.
Inventors
- 👤 C Hisserich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:07
CPC Classifications
F; F16; F16G; F16G1/00; F16G1/28; F02; F02B; F02B67/00; F02B67/04; F02B67/06; F02B2275/00; F02B2275/20
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
86 words
A mechanical drive system comprising a first and a second toothed pulley, each having predetermined numbers of teeth, and a flexible elastomeric belt connecting said pulleys and having teeth engaging the teeth on said pulleys, said first pulley having an irregularity sufficient to cause substantial local wear in said belt by repetitive engagement with portions of said belt, and the number of teeth on said belt being incommensurable with the number of teeth on said first pulley, whereby said wear is evenly distributed around said belt.
Claim 2
Dependent Claim
86 words
A mechanical drive system comprising a first and a second toothed pulley, each having predetermined numbers of teeth, and a flexible elastomeric belt connecting said pulleys and having teeth engaging the teeth on said pulleys, said first pulley having an irregularity sufficient to cause substantial local wear in said belt by repetitive engagement with portions of said belt, and the number of teeth on said belt being incommensurable with the number of teeth on said first pulley, whereby said wear is evenly distributed around said belt.
Claim 3
Dependent Claim
20 words
A mechanical drive system according to claim 1, wherein: the number of teeth on said belt is a prime number.
Claim 4
Dependent Claim
32 words
A mechanical drive system according to claim 1, wherein: the torque transmitted by said system is relatively high and relatively intermittent, and the ratio between said pulleys is a small discrete number.
Claim 5
Dependent Claim
14 words
A mechanical drive system according to claim 3, wherein: said ratio is exactly 2.
Claim 6
Dependent Claim
102 words
In an internal combustion engine having a timing belt pulley connected directly to its crankshaft and having a predetermined number of teeth, and another timing belt pulley connected directly to its camshaft and having exactly twice said number of teeth, said pulleys being subject to manufacturing irregularities adapted to produce localized wear upon portions of a timing belt by selective repetitive engagement therewith, a toothed timing belt of flexible elastomeric material connecting said pulleys and having a prime number of teeth, whereby said wear is evenly distributed among all the teeth of said belt, whatever the numbers of teeth in said pulleys.
Claim 7
Dependent Claim
102 words
In an internal combustion engine having a timing belt pulley connected directly to its crankshaft and having a predetermined number of teeth, and another timing belt pulley connected directly to its camshaft and having exactly twice said number of teeth, said pulleys being subject to manufacturing irregularities adapted to produce localized wear upon portions of a timing belt by selective repetitive engagement therewith, a toothed timing belt of flexible elastomeric material connecting said pulleys and having a prime number of teeth, whereby said wear is evenly distributed among all the teeth of said belt, whatever the numbers of teeth in said pulleys.
References Cited (Backward Citations)
US3603296A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-11 | 1976-12-11 | 1977-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-11 | 1980-12-11 | 1981-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-11 | 1984-12-11 | 1985-06-12 | $7700.00 | Window Closed / Lapsed |