US3659567A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drive means for the cooling fan of an internal combustion engine
Assignee: Bentley Motors Ltd
•
Filing: 1970-07-13
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Granted: 1972-05-02
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Expires: 1990-07-13
Abstract
Abstract A hydraulic drive for the fan of an internal combustion engine in which an existing constant flow supply of hydraulic fluid is used to actuate a hydraulic motor to drive the fan. A
Inventors
- 👤 Frederick R Murray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:44
CPC Classifications
F; F01; F01P; F01P7/00; F01P7/02; F01P7/04; F01P5/00; F01P5/02; F01P5/04
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
217 words
Drive means for the cooling fan of an internal combustion engine of a vehicle having a power steering mechanism comprising a hydraulic pump having a substantially constant output flow of hydraulic fluid, a hydraulic motor having an inlet and outlet for driving said fan, a hydraulic motor having an inlet and outlet for said power steering mechanism, a first fluid duct connecting said output of said pump to said inlet of said fan motor, a second fluid duct connecting said outlet of said fan motor to said inlet of said motor for said steering mechanism, a third fluid duct connecting said outlet of said steering mechanism''s motor to said hydraulic pump, a first by-pass duct for conveying fluid from said first duct to said second duct, said first bypass duct having valve means therein including temperature responsive control means for opening said valve means when the temperature of the engine falls below a predetermined value, a second by-pass duct in fluid communication with said first duct and said second duct, said second by-pass duct having valve means therein including pressure responsive control means for opening said valve means of said second by-pass duct when the pressure at said inlet of said motor for said steering mechanism exceeds the pressure at said outlet thereof by a predetermined value.
Claim 2
Dependent Claim
217 words
Drive means for the cooling fan of an internal combustion engine of a vehicle having a power steering mechanism comprising a hydraulic pump having a substantially constant output flow of hydraulic fluid, a hydraulic motor having an inlet and outlet for driving said fan, a hydraulic motor having an inlet and outlet for said power steering mechanism, a first fluid duct connecting said output of said pump to said inlet of said fan motor, a second fluid duct connecting said outlet of said fan motor to said inlet of said motor for said steering mechanism, a third fluid duct connecting said outlet of said steering mechanism''s motor to said hydraulic pump, a first by-pass duct for conveying fluid from said first duct to said second duct, said first bypass duct having valve means therein including temperature responsive control means for opening said valve means when the temperature of the engine falls below a predetermined value, a second by-pass duct in fluid communication with said first duct and said second duct, said second by-pass duct having valve means therein including pressure responsive control means for opening said valve means of said second by-pass duct when the pressure at said inlet of said motor for said steering mechanism exceeds the pressure at said outlet thereof by a predetermined value.
Claim 3
Dependent Claim
52 words
The drive means as claimed in claim 1 wherein said valve means in said first by-pass duct includes a first valve which is controlled by said temperature responsive control means and a second valve which opens said first by-pass duct when the back pressure across said fan motor exceeds a predetermined value.
References Cited (Backward Citations)
US2777287A
Cited
US3217697A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |