US3762497A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air cooled internal combustion engine with noise reducing means
Assignee: Motorenfabrik Hatz GmbH and Co KG
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Filing: 1972-04-12
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Granted: 1973-10-02
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Expires: 1992-04-12
Abstract
Abstract An air-cooled internal combustion engine is provided with noise reducing means without increasing space requirements. A blower is provided to direct cooling air to at least one engine wall, for example a cylinder wall, and an engine accessory such as a fuel tank, which is needed in any event, forms a conduit to convey cooling air away from the engine wall. The cooling air path is lined with noise absorbing material, such as rock wool, held in position by a foraminous sheet. Where the blower impeller is rotatably mounted on a fixed shaft, similar noise reducing means can be provided on the shaft on the downstream side, the upstream side, or both, of the impeller.
Inventors
- 👤 E Hatz
- 👤 J Schmuck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:56
CPC Classifications
F; F01; F01P; F01P11/00; F01P11/12; F02; F02B; F02B77/00; F02B77/11; F02B77/13; G; G10; G10K; G10K11/00; G10K11/16; G10K11/161
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
122 words
In an air-cooled internal combustion engine having blower means for moving an air stream for cooling at least one engine wall and having means for reducing the noises caused by moving engine elements, the improvement wherein: an engine accessory is utilized to form a coolant air exit conduit for conveying cooling air away from said engine wall; said blower comprises an impeller mounted on a fixed shaft extending between said blower and said engine wall; a layer of noise absorbing material is positioned on said fixed shaft between said impeller and said engine wall and surrounding said shaft; and a noise absorbing material is positioned adjacent the cooling air path on the inside of the exit conduit formed by said engine accessory.
Claim 2
Dependent Claim
122 words
In an air-cooled internal combustion engine having blower means for moving an air stream for cooling at least one engine wall and having means for reducing the noises caused by moving engine elements, the improvement wherein: an engine accessory is utilized to form a coolant air exit conduit for conveying cooling air away from said engine wall; said blower comprises an impeller mounted on a fixed shaft extending between said blower and said engine wall; a layer of noise absorbing material is positioned on said fixed shaft between said impeller and said engine wall and surrounding said shaft; and a noise absorbing material is positioned adjacent the cooling air path on the inside of the exit conduit formed by said engine accessory.
Claim 3
Dependent Claim
28 words
An improved air cooled internal combustion engine according to claim 1 wherein said noise absorbing material is in the form of a layer surrounding the cooling air path.
Claim 4
Dependent Claim
19 words
An improved air cooled internal combustion engine according to claim 1 wherein said noise absorbing material comprises rock wool.
Claim 5
Dependent Claim
27 words
An improved air cooled internal combustion engine according to claim 1 wherein said noise absorbing material is held in position by mounting means comprising a foraminous member.
Claim 6
Dependent Claim
34 words
An improved air cooled internal combustion engine according to claim 1 wherein a further layer of noise absorbing material is positioNed at the air intake side of said blower on and surrounding said shaft.
Claim 7
Dependent Claim
32 words
An improved air cooled internal combustion engine according to claim 5 wherein said layer and further layer of noise absorbing material are held in position by mounting means comprising a foraminous member.
Claim 8
Dependent Claim
40 words
An improved air cooled internal combustion engine according to claim 1 wherein said blower includes an impeller rotatably mounted within a housing, wherein said engine includes an engine housing, and wherein said blower housing is secured to said engine housing.
Claim 9
Dependent Claim
19 words
An improved air cooled internal combustion engine according to claim 1 wherein said engine accessory comprises a fuel tank.
References Cited (Backward Citations)
CA761751A
Cited
US3021914A
Cited
US3530840A
Cited
US3521726A
Cited
US3601101A
Cited
US3684053A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-01 | 1977-04-02 | 1977-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-01 | 1981-04-02 | 1981-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-01 | 1985-04-02 | 1985-10-02 | $7700.00 | Window Closed / Lapsed |