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US3650249A
Expired / Lapsed
US
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Apparatus for utilizing cooling air for an internal combustion engine for heating a passenger compartment
Assignee: Honda Motor Co Ltd
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Filing: 1970-06-12
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Granted: 1972-03-21
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Expires: 1990-06-12
Abstract
Abstract An internal combustion engine for a motorcar has, at the outer surface of at least its cylinder head portion, a forced cooling air passage which is in communication at its outlet with the interior of the passenger compartment. The spark plugs are positioned within this passage and a tubular partition wall surrounds each plug to isolate the plug in airtight manner from the interior of the passage. Each partition wall has an opening at its upper end in communication with the external air. The tubular wall may be provided at its base portion with an opening extending into the interior of the passage, so that a portion of the cooling air within the passage flows into the interior of the tubular wall and out through the opening at the upper end. The upper end of the tubular wall may be provided with a cover and the opening at the upper end extends laterally beneath the cover.
Inventors
- 👤 Soichiro Honda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:49
CPC Classifications
F; F02; F02F; F02F1/00; F02F1/24; F02F1/26; F02F1/28; F02F1/30; F02F1/32; B; B60; B60H; B60H1/00; B60H1/02; B60H1/14; B60H1/16; F02B; F02B1/00; F02B1/02; F02B1/04; F02B2275/00; F02B2275/20
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
92 words
For cooling an internal combustion engine of a vehicle in which the engine has at least a cylinder head portion thereof exposed to an air passage leading to a passenger compartment of the vehicle for supplying heated air thereto, said engine having spark plugs positioned within said passage; an improvement comprising a tubular partition wall surrounding each plug and isolating the plug in airtight manner from said passage and the air flowing therein, and means providing communication between the interior of each said partition wall and external ambient atmosphere outside said passage.
Claim 2
Dependent Claim
92 words
For cooling an internal combustion engine of a vehicle in which the engine has at least a cylinder head portion thereof exposed to an air passage leading to a passenger compartment of the vehicle for supplying heated air thereto, said engine having spark plugs positioned within said passage; an improvement comprising a tubular partition wall surrounding each plug and isolating the plug in airtight manner from said passage and the air flowing therein, and means providing communication between the interior of each said partition wall and external ambient atmosphere outside said passage.
Claim 3
Dependent Claim
80 words
An improvement as claimed in claim 1 wherein said means is constituted by an opening in the partition wall at the top thereof. 3 An improvement as claimed in claim 2 wherein each said partition wall has an opening at the bottom thereof in communication with said passage for flow of air from the passage through said partition wall and to said opening in the top of the wall to produce cooling airflow around the plug in the partition wall.
Claim 4
Dependent Claim
31 words
An improvement as claimed in claim 2 comprising covering means closing each said tubular wall at the top thereof, said opening in the wall extending laterally therein beneath said covering means.
Claim 5
Dependent Claim
21 words
An improvement as claimed in claim 2 comprising fins on said cylinder head portion in said passage to enhance heat exchange.
Claim 6
Dependent Claim
23 words
An improvement as claimed in claim 1 wherein said cylinder head portion has inner and outer walls and heat exchange fins extending therebetween.
Claim 7
Dependent Claim
14 words
An improvement as claimed in claim 6 wherein said heat-exchange fins are substantially horizontal.
Claim 8
Dependent Claim
22 words
An improvement as claimed in claim 7 wherein said tubular partition wall and plugs are inclined with respect to said horizontal fins.
Claim 9
Dependent Claim
23 words
An improvement as claimed in claim 8 wherein each said tubular partition wall encloses the associated plug along substantially the entire length thereof.
Claim 10
Dependent Claim
31 words
An improvement as claimed in claim 2 wherein said engine has a cylinder main body portion with a joint with said cylinder head portion, said passage being positioned above said joint.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-21 | 1975-09-20 | 1976-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-21 | 1979-09-20 | 1980-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-21 | 1983-09-20 | 1984-03-21 | $7700.00 | Window Closed / Lapsed |