Patent US5138677A successfully refreshed from Google Patents.
Patent US3913831A successfully refreshed from Google Patents.
US3913831A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil cooler bypass valve
Assignee: Deere and Co
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Filing: 1974-03-22
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Granted: 1975-10-21
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Expires: 1994-03-22
Abstract
Abstract A spool-type bypass valve is provided for controlling the flow of oil either to a circuit including an oil cooler or to a circuit bypassing the oil cooler. The valve includes an axially shiftable valve spool which is normally operated by an axially extendible and retractable thermostatic element which is in fluid communication with fluid upstream from the cooler and responsive to the temperature thereof to shift the valve spool between first and second positions for respectively directing fluid to the cooler circuit or to a reservoir. A pilot pressure circuit is connected to the valve spool to act in opposition to the thermostatic element so as to override the latter to cause fluid to be directed to the reservoir when the pressure of the fluid upstream from the cooler reaches an abnormally high value indicative of a condition such as would occur in the event that the oil cooler circuit became clogged.
Inventors
- 👤 John Frank Talak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:17
CPC Classifications
F; F16; F16H; F16H57/00; F16H57/04; F16H57/0412; F16H57/0413; F01; F01M; F01M5/00; F01M5/005; F01M5/007; G; G05; G05D; G05D23/00; G05D23/01; G05D23/13; G05D23/1306; G05D23/132; G05D23/1333; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86718; Y10T137/86726
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
348 words
An oil cooler bypass valve, comprising: a valve body containing a valve bore having first and second closed ends and intersected at spaced locations by inlet, outlet, return and sump ports respectively adapted for connection to the outlet of an oil-controlled vehicle function, and oil cooler inlet, and oil cooler outlet and an oil reservoir; said inlet port being between said outlet and return ports; a valve spool axially shiftably mounted in said bore and including first and second lands at opposite ends thereof; said first land including an axial recess; an axially extendible and retractable thermostatic element normally located in an operative position in the bore adjacent said first land and including an end portion received in said recess and further including a positioning surface normally engaged with a shoulder of the bore facing axially away from the first land; a first biasing means urging said element against said shoulder; passage means connected between said inlet port and said bore at a location in fluid communication with said thermostatic element; and second biasing means exerting less force than said first biasing means and urging said valve spool toward said thermostatic element; said thermostatic element being responsive to the temperature of oil at said inlet and being in a completely retracted condition when the oil is below a predetermined first temperature and in a fully extended condition wHen the oil is above a predetermined second temperature higher than the first temperature, said valve spool being shifted against said second biasing means by said thermostatic element during extension of the latter and said first and second lands being so located relative to said outlet and sump ports that said inlet port is respectively blocked from said outlet port and connected in fluid communication with said sump port by a path through the bore when the thermostatic element is in its completely retracted condition, and is respectively connected in fluid communication with said outlet port by a path through the bore and blocked from fluid communication with said sump port when the thermostatic element is in its fully extended condition.
Claim 2
Dependent Claim
348 words
An oil cooler bypass valve, comprising: a valve body containing a valve bore having first and second closed ends and intersected at spaced locations by inlet, outlet, return and sump ports respectively adapted for connection to the outlet of an oil-controlled vehicle function, and oil cooler inlet, and oil cooler outlet and an oil reservoir; said inlet port being between said outlet and return ports; a valve spool axially shiftably mounted in said bore and including first and second lands at opposite ends thereof; said first land including an axial recess; an axially extendible and retractable thermostatic element normally located in an operative position in the bore adjacent said first land and including an end portion received in said recess and further including a positioning surface normally engaged with a shoulder of the bore facing axially away from the first land; a first biasing means urging said element against said shoulder; passage means connected between said inlet port and said bore at a location in fluid communication with said thermostatic element; and second biasing means exerting less force than said first biasing means and urging said valve spool toward said thermostatic element; said thermostatic element being responsive to the temperature of oil at said inlet and being in a completely retracted condition when the oil is below a predetermined first temperature and in a fully extended condition wHen the oil is above a predetermined second temperature higher than the first temperature, said valve spool being shifted against said second biasing means by said thermostatic element during extension of the latter and said first and second lands being so located relative to said outlet and sump ports that said inlet port is respectively blocked from said outlet port and connected in fluid communication with said sump port by a path through the bore when the thermostatic element is in its completely retracted condition, and is respectively connected in fluid communication with said outlet port by a path through the bore and blocked from fluid communication with said sump port when the thermostatic element is in its fully extended condition.
Claim 3
Dependent Claim
53 words
The oil cooler bypass valve defined in claim 1 wherein said second land has an axially opening hollow interior forming a spring receptacle and said second biasing means being a coil compression spring partially located in said hollow interior and acting between said first closed end of the bore and the valve spool.
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) | 1978-10-20 | 1979-04-21 | 1979-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-20 | 1983-04-21 | 1983-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-20 | 1987-04-21 | 1987-10-21 | $7700.00 | Window Closed / Lapsed |