US3726512A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus to regulate the intake air temperature of combustion engine prime movers
Assignee: Mann and Hummel GmbH
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Filing: 1971-06-09
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Granted: 1973-04-10
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Expires: 1991-06-09
Abstract
Abstract An apparatus automatically sensing and regulating intake air temperatures for combustion engines equipped with a carburetor or with a propane gas fuel operated fuel injector. The temperature of the intake air entering the engine is sensed by a bimetallic valve element, which simultaneously operates a flapper valve by means of the engine intake vacuum. The flapper valve automatically proportions the amount of raw cold intake air and preheated intake air for optimum engine operation.
Inventors
- 👤 H Herwig
- 👤 M Mueller
- 👤 P Schoenefeld
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:09
CPC Classifications
F; F02; F02M; F02M31/00; F02M31/02; F02M31/04; F02M31/06; F02D; F02D2200/00; F02D2200/02; F02D2200/06; F02D2200/0606; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
250 words
An apparatus to sense, regulate and control the intake air temperatures of internal combustion engines, comprising: an intake air filter; a raw air intake duct connected to said filter; a warm air intake duct; a cold air intake duct; a flap valve with two positions; said flap valve located in said raw air intake duct; and means to close said warm air intake duct in one of said valve positions; a clean air chamber; a carburetor; a gas throttle valve pivotably mounted in said carburetor; an intake duct mounted below said carburetor; a vacuum motor comprising a diaphragm and a return spring mounted on said raw air intake duct; means to move said flap valve to an open position, being one of said positions opening said warm air duct and to a position being one of said positions closing said cold air intake duct; said vacuum line openly connected to said intake duct below said throttle valve and openly connected to the underside of said diaphragm of said vacuum motor; a valve chamber located in said clean air chamber, comprising a calibrated passage openly connected to said vacuum line, a valve opening, a valve element, a bimetallic spring, means to manipulate said valve element in reaction to temperature variation in said clean air chamber; a bleeder hole passage open to said clean air chamber and said valve chamber, the crosssectional Area of said bleeder hole being between 20 percent and 100 percent of the crosssectional area of said calibrated passage.
Claim 2
Independent Claim
250 words
An apparatus to sense, regulate and control the intake air temperatures of internal combustion engines, comprising: an intake air filter; a raw air intake duct connected to said filter; a warm air intake duct; a cold air intake duct; a flap valve with two positions; said flap valve located in said raw air intake duct; and means to close said warm air intake duct in one of said valve positions; a clean air chamber; a carburetor; a gas throttle valve pivotably mounted in said carburetor; an intake duct mounted below said carburetor; a vacuum motor comprising a diaphragm and a return spring mounted on said raw air intake duct; means to move said flap valve to an open position, being one of said positions opening said warm air duct and to a position being one of said positions closing said cold air intake duct; said vacuum line openly connected to said intake duct below said throttle valve and openly connected to the underside of said diaphragm of said vacuum motor; a valve chamber located in said clean air chamber, comprising a calibrated passage openly connected to said vacuum line, a valve opening, a valve element, a bimetallic spring, means to manipulate said valve element in reaction to temperature variation in said clean air chamber; a bleeder hole passage open to said clean air chamber and said valve chamber, the crosssectional Area of said bleeder hole being between 20 percent and 100 percent of the crosssectional area of said calibrated passage.
Claim 3
Dependent Claim
59 words
An apparatus to sense, regulate and control the intake air temperatures of internal combustion engines as in claim 1, said valve element being a sphere; means to locate said valve element closingly and adjustingly against said valve opening; and means to create said bimetallic spring subjected to said intake air of a certain temperature, pressingly against said valve element.
Claim 4
Dependent Claim
102 words
An apparatus to sense, regulate and control the intake air temperatures of internal combustion engines as in claim 2, said valve chamber comprising: a valve insert; an upper chamber part comprising said valve opening and a lower chamber part, both said parts being injection molded plastic parts; said upper part and said lower part being air-tightly connected; a metal frame comprising; an internally threaded collar mounting said valve insert on one end, a downwardly projecting extension on the other end, said bimetallic spring being mounted on said extension, said metal frame being mounted in alignment between said upper and lower chamber parts.
Claim 5
Dependent Claim
75 words
An apparatus to sense, regulate and control the intake air temperatures of internal combustion engines as claimed in claim 3, said valve chamber being elongated with two ends, and said collar of said metal frame being mounted at one end of said upper chamber part, said downward projected extension, mounted with said bimetallic spring extending toward the other of said two ends; said extension comprising an elongated opening centrally located below said bleeder hole passage.
Claim 6
Dependent Claim
74 words
An apparatus to sense, regulate and control the intake air temperatures of internal combustion engines as claimed in claim 4, said upper chamber part of said valve chamber comprising an opening on one of its said two ends; a hollow cylindrical hublike projection with a bottom forming shallow conelike detente; said collar of said metal frame air-tightly mounted in said opening; said valve insert mounted in said collar extending partly into said hublike projection.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-09 | 1976-10-09 | 1977-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-09 | 1980-10-09 | 1981-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-09 | 1984-10-09 | 1985-04-10 | $7700.00 | Window Closed / Lapsed |