Patent US3830210A successfully refreshed from Google Patents.
US3830210A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air intake system with temperature-controlled warm air valve
Assignee: Mann and Hummel GmbH
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Filing: 1972-09-21
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Granted: 1974-08-20
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Expires: 1992-09-21
Abstract
Abstract An air intake system for carburetion-type internal combustion engines in which a cold air duct and a warm air duct lead via a flap valve to the air filter, the flap valve controlling the relative mixture of a cold air and warm air. A spring-loaded membrane actuator connected to the negative pressure in the engine intake manifold controls the flap valve position. An air temperature responsive relief valve in the air connection reduces the negative air pressure on the membrane actuator when the air temperature reaches a certain value, thereby moving the flap valve to admit less warm air. However, a thermostat-controlled back pressure valve in the same air connection blocks this effect until the engine has reached its operating temperature.
Inventors
- 👤 H Mueller
- 👤 P Schonefeld
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:21
CPC Classifications
F; F02; F02M; F02M31/00; F02M31/02; F02M31/04; F02M31/06; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
195 words
An air intake system for carburation-type combustion engines comprising in combination: an air intake duct through which the combustion air is drawn into the engine intake via the carburetor; a cold air duct leading from the outside into the air intake duct; a warm air duct also leading from the outside into the air intake duct and including a means for preheating the air which is drawn through it; valve means for adjustably closing the cold air duct and correspondingly opening the warm air duct so as to permit an adjustment of the relative quantities of cold air and warm air admitted into the air intake duct to obtain an adjustment of the intake air temperature; means for controlling the adjustment position of said valve means in response to the intake air temperature; means for checking the valve position controlling means so as to allow only one-way adjustment of the valve means in the direction of closing of the cold air duct during warmup operation of the engine; and means for inactivating said checking means after warmup by establishing two-way adjustability of the valve means, when a predetermined engine operating temperature is reached or exceeded.
Claim 2
Dependent Claim
195 words
An air intake system for carburation-type combustion engines comprising in combination: an air intake duct through which the combustion air is drawn into the engine intake via the carburetor; a cold air duct leading from the outside into the air intake duct; a warm air duct also leading from the outside into the air intake duct and including a means for preheating the air which is drawn through it; valve means for adjustably closing the cold air duct and correspondingly opening the warm air duct so as to permit an adjustment of the relative quantities of cold air and warm air admitted into the air intake duct to obtain an adjustment of the intake air temperature; means for controlling the adjustment position of said valve means in response to the intake air temperature; means for checking the valve position controlling means so as to allow only one-way adjustment of the valve means in the direction of closing of the cold air duct during warmup operation of the engine; and means for inactivating said checking means after warmup by establishing two-way adjustability of the valve means, when a predetermined engine operating temperature is reached or exceeded.
Claim 3
Dependent Claim
23 words
An air intake system as defined in claim 1, wherein: said predetermined engine operating temperature is the temperature of the engine valve cover.
Claim 4
Dependent Claim
29 words
An air intake system as defined in claim 1, wherein: said predetermined engine operating temperature is the temperature of the cooling water in the cooling system of the engine.
Claim 5
Dependent Claim
29 words
An air intake system as defined in claim 1, wherein: said predetermined engine operating temperature is the temperature of the cooling air in the cooling system of the engine.
Claim 6
Dependent Claim
20 words
An air intake system as defined in claim 1, wherein: said predetermined engine operating temperature is the intake air temperature.
Claim 7
Dependent Claim
55 words
An air intake system as defined in claim 1, wherein said valve position controlling means includes: means for driving the valve means in response to the engine load as reflected by the negative pressure inside the engine intake duct downstream of the carburetor, whereby the cold air duct is progressively reopened with increasing engine load.
Claim 8
Dependent Claim
153 words
An air intake system as defined in claim 6, wherein: the valve means is of the flap valve type which is pivotable between a first end position in which the cold air duct is open and the warm air duct is substantially closed, and a second end position in which the cold air duct is substantially closed and the warm air duct is open; the valve driving means includes a membrane actuator connected to the flap valve, a resetting spring biasing the flap valve toward its first end position, aNd an air connection to the engine intake downstream of the carburetor transmitting the negative intake pressure to the membrane actuator in opposition to the resetting spring; and the valve controlling means is a temperature controlled pressure relief valve which adjustably opens said air connection to the outside in response to a rising intake air temperature so as to reduce the negative pressure therein.
Claim 9
Dependent Claim
96 words
An air intake system as defined in claim 7, wherein: said checking means is a back pressure valve arranged in said air connection between the pressure relief valve and the membrane actuator; the back pressure valve having a movable valve element which is biased closed in such a way as to permit air to flow away from the membrane actuator, but not toward it; and the means for inactivating the checking means is a thermostatically controlled member opening the movable valve element against its closing bias, when the predetermined engine operating temperature is reached or exceeded.
Claim 10
Dependent Claim
30 words
An air intake system as defined in claim 8, wherein: the inactivating means of the back pressure valve is a bimetallic member sensing the temperature of the engine valve cover.
Claim 11
Dependent Claim
36 words
An air intake system as defined in claim 8, wherein: the inactivating means of the back pressure valve is a bimetallic member sensing the temperature of the cooling water in the cooling system of the engine.
Claim 12
Dependent Claim
36 words
An air intake system as define in claim 8, wherein: the inactivating means of the back pressure valve is a bimetallic member sensing the temperature of the cooling air in the cooling system of the engine.
Claim 13
Dependent Claim
34 words
An air intake system as defined in claim 8, wherein: the inactivating means of the back pressure valve is a bimetallic member sensing the temperature of the intake air in the air intake duct.
Claim 14
Dependent Claim
190 words
A temperature controlled back pressure valve adapted for use in conjunction with an air intake system for carburation-type internal combustion engines having a vacuum motor controlled warm air admitting valve, where said back pressure valve serves to check the vacuum motor operation so as to allow only one-way adjustments thereof in the direction of increasing the intake of warm air during engine warmup, the back pressure valve comprising: a valve housing having a first and second air space communicating via an air passage, the first air space being connectable to the vacuum motor and the second air space being connectable to the engine intake downstream of the carburetor; a valve seat in said air passage; a closure member cooperating with the valve seat, the closure member moving toward the second air space when opening, while being biased toward the valve seat so as to allow only oneway air flow from the first air space into the second air space; and means for inactivating the back pressure valve after engine warmup, by establishing an open communication between the two air spaces, when a predetermined engine operating temperature is reached or exceeded.
Claim 15
Dependent Claim
190 words
A temperature controlled back pressure valve adapted for use in conjunction with an air intake system for carburation-type internal combustion engines having a vacuum motor controlled warm air admitting valve, where said back pressure valve serves to check the vacuum motor operation so as to allow only one-way adjustments thereof in the direction of increasing the intake of warm air during engine warmup, the back pressure valve comprising: a valve housing having a first and second air space communicating via an air passage, the first air space being connectable to the vacuum motor and the second air space being connectable to the engine intake downstream of the carburetor; a valve seat in said air passage; a closure member cooperating with the valve seat, the closure member moving toward the second air space when opening, while being biased toward the valve seat so as to allow only oneway air flow from the first air space into the second air space; and means for inactivating the back pressure valve after engine warmup, by establishing an open communication between the two air spaces, when a predetermined engine operating temperature is reached or exceeded.
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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) | 1977-08-19 | 1978-02-18 | 1978-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-19 | 1982-02-18 | 1982-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-19 | 1986-02-18 | 1986-08-20 | $7700.00 | Window Closed / Lapsed |