Patent US4440993A successfully refreshed from Google Patents.
Patent US4846136A successfully refreshed from Google Patents.
US4846136A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust heated induction air for two-cycle engine
Assignee: Brunswick Corp
•
Filing: 1988-02-26
•
Granted: 1989-07-11
•
Expires: 2008-02-26
Abstract
Abstract Intake air to the carburetor of a two-cycle engine is preheated by ducting ambient temperature outside air past hot engine surfaces. Preferably, a portion of the intake air duct includes a heat exchanger formed integrally with the outer wall of the engine exhaust manifold. The use of heated intake air enhances idle and low speed operation of the engine by reducing or eliminating fuel puddling and by narrowing the temperature range used for carburetor calibration.
Inventors
- 👤 George E. Phillips
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:25
CPC Classifications
F; F02; F02M; F02M31/00; F02M31/02; F02M31/04; F02M31/042; F02B; F02B61/00; F02B61/04; F02B61/045; F02M31/06; F02M31/07; F02M31/08; F02B75/00; F02B75/02; F02B2075/022; F02B2075/025; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
132 words
In a two-cycle internal combustion engine including an exhaust housing receiving exhaust gases from the engine combustion chamber, an engine crankcase including means for supplying an air-fuel mixture to the combustion chamber, and a combustion air intake in communication with the air-fuel supply means, apparatus for improving engine performance at low speed and/or cool ambient temperatures comprising: a. intake air passage means for receiving outside air and directing the same to the combustion air intake; b. air heating means in communication with the intake air passage means for heating essentially all of the combustion air supplied to said engine; and c. first means for selectively directing ambient outside air through the air heating means at low engine speeds to heat the ambient air to a temperature sufficient to substantially eliminate fuel puddling.
Claim 2
Dependent Claim
132 words
In a two-cycle internal combustion engine including an exhaust housing receiving exhaust gases from the engine combustion chamber, an engine crankcase including means for supplying an air-fuel mixture to the combustion chamber, and a combustion air intake in communication with the air-fuel supply means, apparatus for improving engine performance at low speed and/or cool ambient temperatures comprising: a. intake air passage means for receiving outside air and directing the same to the combustion air intake; b. air heating means in communication with the intake air passage means for heating essentially all of the combustion air supplied to said engine; and c. first means for selectively directing ambient outside air through the air heating means at low engine speeds to heat the ambient air to a temperature sufficient to substantially eliminate fuel puddling.
Claim 3
Dependent Claim
23 words
The apparatus as set forth in claim 1 including second means for selectively directing ambient outside air directly to the combustion air intake.
Claim 4
Dependent Claim
28 words
The apparatus as set forth in claim 2 wherein each of the means for selectively directing ambient outside air includes an air inlet in the intake air passage.
Claim 5
Dependent Claim
32 words
The apparatus as set forth in claim 3 including an air inlet closure common to both air inlets and operable to simultaneously effect opening of one inlet and closing of the other.
Claim 6
Dependent Claim
28 words
The apparatus as set forth in claim 4, including means for operating the air inlet closure to control the maximum temperature of air to the combustion air intake.
Claim 7
Dependent Claim
18 words
The apparatus as set forth in claim 4 wherein operation of the air inlet closure is thermostatically controlled.
Claim 8
Dependent Claim
20 words
The apparatus as set forth in claim 4 wherein the air inlet closure is operable in response to engine speed.
Claim 9
Dependent Claim
17 words
The apparatus as set forth in claim 1 wherein the air heating means comprises a heat exchanger.
Claim 10
Dependent Claim
20 words
The apparatus as set forth in claim 8 wherein the heat exchanger is disposed in the intake air passage means.
Claim 11
Dependent Claim
28 words
The apparatus as set forth in claim 9 wherein the portion of the intake air passage means including the heat exchanger is disposed directly adjacent the exhaust housing.
Claim 12
Dependent Claim
30 words
The apparatus as set forth in claim 10 wherein the heat exchanger comprises heat exchanging surfaces in the intake air passage, said surfaces being integrally attached to the exhaust housing.
Claim 13
Dependent Claim
17 words
The apparatus as set forth in claim 4 wherein the air heating means comprises a heat exchanger.
Claim 14
Dependent Claim
20 words
The apparatus as set forth in claim 12 wherein the heat exchanger is disposed in the intake air passage means.
Claim 15
Dependent Claim
28 words
The apparatus as set forth in claim 13 wherein the portion of the intake air passage means including the heat exchanger is disposed directly adjacent the exhaust housing.
Claim 16
Dependent Claim
30 words
The apparatus as set forth in claim 14 wherein the heat exchanger comprises heat exchanging surfaces in the intake air passage, said surfaces being integrally attached to the exhaust housing.
References Cited (Backward Citations)
US2388331A
Cited
US2781032A
Cited
US3513817A
Cited
US3868058A
Cited
US3805751A
Cited
US3800753A
Cited
US3918421A
Cited
US3974808A
Cited
US4082068A
Cited
DE3043584A1
Cited
US4333425A
Cited
US4534333A
Cited
GB2146386A
Cited
US4545357A
Cited
GB2155665A
Cited
US4590897A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-07-10 | 1993-01-09 | 1993-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-10 | 1997-01-09 | 1997-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-10 | 2001-01-09 | 2001-07-11 | $7700.00 | Window Closed / Lapsed |