US3877455A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Engine protective system
Assignee: INSTITUTE OF GENERAL AND PHYSICAL CHEMISTRY AND INSTITUTE FOR BIOLOGICAL PHYSICS OF USSR ACADEMY OF SCIENCE
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Filing: 1973-05-11
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Granted: 1975-04-15
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Expires: 1993-05-11
Abstract
Abstract A system for protecting an internal combustion engine from damage in the event of a malfunction in the engine cooling system includes a coolant flow pressure controlled valve interposed in the oil line leading from an oil pressure actuated fuel control device back to the engine sump. When the engine is operating, the valve is normally maintained closed by the flow pressure in the cooling system. However, when the coolant flow pressure drops below a predetermined value due to a malfunction such as a break in a radiator hose, a leak in some other element of the cooling system, a faulty water pump or a slipping or broken fan belt, the valve is automatically opened by spring pressure to release the oil pressure at the valve and permit the oil to flow into the dump line to the sump. The resulting drop in oil pressure at the fuel control device enables the device to shut off the supply of fuel to the engine. The coolant flow pressure controlled valve is connected into the oil line in parallel with another normally closed temperature responsive valve which is opened when the temperature of the coolant rises above aa predetermined value.
Inventors
- 👤 Joe E Goodwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:05
CPC Classifications
F; F01; F01P; F01P11/00; F01P11/14; F01M; F01M1/00; F01M1/18; F01M1/20; F01M1/22; F01M1/24; F02; F02B; F02B77/00; F02B77/08; F02B3/00; F02B3/06
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
298 words
In apparatus for controlling the flow of fuel to an internal combustion engine in response to pressure and temperature conditions existing in the pressure lubricating system and the cooling system of the engine of the type comprising a valve in the fuel supply line of the engine, pressure actuated means normally subject to the pressure of the oil in said lubricating system for maintaining said valve in open position as long as the pressure exerted on said means is at least equal to a predetermined value, means operable to close said valve when the pressure exerted on said pressure actuated means drops below said predetermined value, and means responsive to the temperature of the coolant in said cooling system for reducing the pressure on said pressure actuated means below said predetermined value when said temperature rises above a predetermined temperature, the improvement which comprises: the inclusion in said apparatus of means responsive to the flow pressure of the coolant in said cooling system for reducing the pressure on said pressure actuated means below said predetermined value when the flow pressure of the coolant drops below a predetermined pressure even though the temperature of the coolant remains below said predetermined temperature, the coolant flow pressure responsive means comprising a valve housing having an inlet connected to the pressure side of the lubricating system and an outlet connected to the non-pressure side of said system, a valve in said body controlling the flow of oil between said inlet and outlet, means subject to the flow pressure of the coolant in the cooling system for maintaining said valve in closed position when said coolant flow pressure is at least equal to a predetermined pressure, and yieldable means for opening said valve when the coolant flow pressure drops below said predetermined pressure.
Claim 2
Dependent Claim
298 words
In apparatus for controlling the flow of fuel to an internal combustion engine in response to pressure and temperature conditions existing in the pressure lubricating system and the cooling system of the engine of the type comprising a valve in the fuel supply line of the engine, pressure actuated means normally subject to the pressure of the oil in said lubricating system for maintaining said valve in open position as long as the pressure exerted on said means is at least equal to a predetermined value, means operable to close said valve when the pressure exerted on said pressure actuated means drops below said predetermined value, and means responsive to the temperature of the coolant in said cooling system for reducing the pressure on said pressure actuated means below said predetermined value when said temperature rises above a predetermined temperature, the improvement which comprises: the inclusion in said apparatus of means responsive to the flow pressure of the coolant in said cooling system for reducing the pressure on said pressure actuated means below said predetermined value when the flow pressure of the coolant drops below a predetermined pressure even though the temperature of the coolant remains below said predetermined temperature, the coolant flow pressure responsive means comprising a valve housing having an inlet connected to the pressure side of the lubricating system and an outlet connected to the non-pressure side of said system, a valve in said body controlling the flow of oil between said inlet and outlet, means subject to the flow pressure of the coolant in the cooling system for maintaining said valve in closed position when said coolant flow pressure is at least equal to a predetermined pressure, and yieldable means for opening said valve when the coolant flow pressure drops below said predetermined pressure.
Claim 3
Dependent Claim
34 words
Apparatus as defined in claim 1 wherein the coolant flow pressure responsive means is connected to the pressure side and the non-pressure side of the lubricating system in parallel with the temperature responsive means.
Claim 4
Dependent Claim
95 words
Apparatus as claimed in claim 1 wherein said coolant flow pressure responsive means includes a diaphragm in said valve housing, means for subjecting one side of said diaphragm to the flow pressure of the coolant in the cooling system, a plunger having one end thereof in engagement with the other side of said diaphragm and the other end in abutment with said valve, said plunger urging said valve into closed position when the pressure exerted on said diaphragm is at least equal to said predetermined pressure, and yieldable means urging said valve toward open position.
Claim 5
Dependent Claim
254 words
Apparatus as defined in claim 1 wherein said pressure actuated means has an oil inlet connected to the pressure side of the lubricating system and an oil outlet, and said temperature responsive means has an oil inlet, an oil outlet, a normally closed valve controlling the flow of oil between said inlet and said outlet, and a thermal responsive element operative to open said valve when the temperature of the coolant rises above said predetermined temperature, and which includes conduit means connecting the oil inlet of said temperature responsive means to the oil outlet of said pressure actuated means, and conduit means connecting the oil outlet of said temperature responsive means to the non-pressure side of the lubricating system, said coolant flow pressure responsive means having an oil inlet and an oil outlet, conduit means connecting the oil inlet and outlet of said coolant flow pressure responsive means to the oil outlet of said pressure actuated means and the low-pressure side of the lubricating system, respectively, in parallel with the oil inlet and outlet of said temperature responsive means, a valve controlling the flow of oil between the oil inlet and outlet of said coolant flow pressure responsive means, means for subjecting said last-named valve to the flow pressure of the coolant in the cooling system and maintaining said valve in closed position as long as the coolant flow pressure is at least equal to a predetermined pressure, and means for opening said valve when the coolant flow pressure drops below said predetermined pressure.
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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) | 1978-04-14 | 1978-10-14 | 1979-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-14 | 1982-10-14 | 1983-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-14 | 1986-10-14 | 1987-04-15 | $7700.00 | Window Closed / Lapsed |