US4004668A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fan drive secant pumping grooves
Assignee: Eljer Manufacturing Inc
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Filing: 1975-08-25
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Granted: 1977-01-25
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Expires: 1995-08-25
Abstract
Abstract A fluid coupling of the type adapted for a fan for an automotive cooling system. A driving disc turns within a housing to which the fan is coupled. One face of the disc carries concentric ridges or lands which are positioned to project into complementary concentric channels carried by the housing, with a shear fluid such as a silicone fluid at least partially filling the concentric channels. Secant grooves extend across the top of the interdigitated ridges of the drive disc and of the housing interior to cause the silicone shear fluid to move generally radially. Such fluid circulation increases the useful life of the shear fluid by inhibiting high temperature build-up thereof.
Inventors
- 👤 Everett George Blair
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:59
CPC Classifications
F; F16; F16D; F16D35/00; F16D35/02; F16D35/021
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
143 words
A fluid coupling of the type adapted for use to drive a fan for the radiator of an internal combustion engine, said coupling including relatively rotatable disc and housing members, said disc and housing having a common axis of rotation, said disc positioned within said housing, said disc on at least one face having a plurality of concentric lands which are positioned within mating concentric channels defined by concentric lands in said housing to thereby define interdigitated lands, said coupling adapted to contain a shear fluid to fill at least a portion of the clearance space between said lands and their corresponding channels for the purpose of transmitting torque, the improvement comprising, a pumping groove in the disc lands and a pumping groove in the housing lands, at least one of said pumping grooves being canted to thereby define a secant pumping groove.
Claim 2
Dependent Claim
143 words
A fluid coupling of the type adapted for use to drive a fan for the radiator of an internal combustion engine, said coupling including relatively rotatable disc and housing members, said disc and housing having a common axis of rotation, said disc positioned within said housing, said disc on at least one face having a plurality of concentric lands which are positioned within mating concentric channels defined by concentric lands in said housing to thereby define interdigitated lands, said coupling adapted to contain a shear fluid to fill at least a portion of the clearance space between said lands and their corresponding channels for the purpose of transmitting torque, the improvement comprising, a pumping groove in the disc lands and a pumping groove in the housing lands, at least one of said pumping grooves being canted to thereby define a secant pumping groove.
Claim 3
Dependent Claim
24 words
The fluid coupling of claim 1 wherein the housing pumping groove and the disc pumping groove are oppositely canted with respect to each other.
Claim 4
Dependent Claim
20 words
The fluid coupling of claim 1 wherein the disc pumping groove is defined by aligned grooves in the disc lands.
Claim 5
Dependent Claim
20 words
The fluid coupling of claim 1 wherein the disc pumping groove is defined by non-aligned grooves on the disc lands.
Claim 6
Dependent Claim
19 words
The fluid coupling of claim 1 wherein the housing groove is defined by aligned grooves on the housing lands.
Claim 7
Dependent Claim
20 words
The fluid coupling of claim 1 wherein the housing pumping groove is defined by non-aligned grooves on the housing lands.
Claim 8
Dependent Claim
21 words
The fluid coupling of claim 1 wherein the housing pumping groove makes an angle with respect to the disc pumping groove.
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) | 1980-01-25 | 1980-07-26 | 1981-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-25 | 1984-07-26 | 1985-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-25 | 1988-07-26 | 1989-01-25 | $7700.00 | Window Closed / Lapsed |