Patent US3744606A successfully refreshed from Google Patents.
US3744606A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual hydraulic or pneumatic coupling
Assignee: ZF Getriebe GmbH
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Filing: 1972-05-15
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Granted: 1973-07-10
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Expires: 1992-05-15
Abstract
Abstract Two nested hydraulic or pneumatic couplings, such as a pair of clutches or a clutch and a brake, have interleaved inner and outer annular friction foils carried on three coaxial sleeves. The middle sleeve is rigid with a fluid cylinder welded onto a central shaft on which the inner sleeve is freely rotatable, a portion of the cylinder wall being axially inbent into an annular clearance separating the inner sleeve from the shaft. The cylinder, open toward the foil assemblies, encloses a piston of re-entrant cross-section, roughly matching that of the cylinder wall, which controls the inner foil assembly while extending into the region of the outer foil assembly so that its effective area substantially equals that of a second piston in a confronting fluid cylinder controlling the outer foil assembly.
Inventors
- 👤 M Bucksch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:38
CPC Classifications
C; C07; C07D; C07D499/00; F; F16; F16D; F16D25/00; F16D25/06; F16D25/062; F16D25/063; F16D25/0635; F16D25/0638; F16D25/10
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
265 words
A fluid-actuated coupling comprising: a shaft; an inner sleeve, an intermediate sleeve and an outer sleeve spacedly and coaxially surrounding said shaft with freedom of independent rotation; a first set of coacting annular friction members axially slidable on said inner sleeve and said intermediate sleeve, respectively; a second set of coacting annular friction members axially slidable on said intermediate sleeve and said outer sleeve, respectively; a first fluid cylinder rigid with said shaft confronting said first and second sets of friction members from one side, said first cylinder having an outer periphery of substantially the same radius as said outer sleeve provided with a radially inward extension secured to said intermediate sleeve; a second fluid cylinder rigid with said outer sleeve confronting said first and second sets of friction members from the opposite side; a first piston in said first fluid cylinder axially displaceable under fluid pressure to drive said first set of friction members against a stop remote from said first cylinder; a second piston in said second fluid cylinder axially displaceable under fluid pressure to drive said second set of friction members against a stop remote from said second cylinder, said pistons having effective fluid-pressure areas of substantially the same outer radius, one of said pistons being of re-entrant cross-section with a central cup portion protruding axially into an annular clearance between said shaft and said inner sleeve; and conduit means for selectively admitting pressure fluid to both said fluid cylinders to move their pistons toward said sleeves for relatively immobilizing said inner and intermediate sleeves and said intermediate and outer sleeves, respectively.
Claim 2
Dependent Claim
265 words
A fluid-actuated coupling comprising: a shaft; an inner sleeve, an intermediate sleeve and an outer sleeve spacedly and coaxially surrounding said shaft with freedom of independent rotation; a first set of coacting annular friction members axially slidable on said inner sleeve and said intermediate sleeve, respectively; a second set of coacting annular friction members axially slidable on said intermediate sleeve and said outer sleeve, respectively; a first fluid cylinder rigid with said shaft confronting said first and second sets of friction members from one side, said first cylinder having an outer periphery of substantially the same radius as said outer sleeve provided with a radially inward extension secured to said intermediate sleeve; a second fluid cylinder rigid with said outer sleeve confronting said first and second sets of friction members from the opposite side; a first piston in said first fluid cylinder axially displaceable under fluid pressure to drive said first set of friction members against a stop remote from said first cylinder; a second piston in said second fluid cylinder axially displaceable under fluid pressure to drive said second set of friction members against a stop remote from said second cylinder, said pistons having effective fluid-pressure areas of substantially the same outer radius, one of said pistons being of re-entrant cross-section with a central cup portion protruding axially into an annular clearance between said shaft and said inner sleeve; and conduit means for selectively admitting pressure fluid to both said fluid cylinders to move their pistons toward said sleeves for relatively immobilizing said inner and intermediate sleeves and said intermediate and outer sleeves, respectively.
Claim 3
Dependent Claim
35 words
A coupling as defined in claim 1 wherein the fluid cylinder associated with said one of said pistons has a cross-section roughly conforming to said re-entrant cross-section and having a hub within said cup portion.
Claim 4
Dependent Claim
39 words
A coupling as defined in claim 2 wherein said conduit means has a branch opening into said hub, the latter being provided with a port leading to said one of said pistons in the region of said cup portion.
Claim 5
Dependent Claim
47 words
A coupling as defined in claim 3, further comprising a housing rotatably supporting said shaft and having a central boss projecting axially into said hub while defining therewith a fluid chamber communicating with said port, said branch passing through said boss and terminating at said fluid chamber.
Claim 6
Dependent Claim
31 words
A coupling as defined in claim 4 wherein said housing includes a shell surrounding said sleeves and a lid secured endwise to said shell, said boss being integral with said lid.
Claim 7
Dependent Claim
16 words
A coupling as defined in claim 4 wherein said associated cylinder is said first fluid cylinder.
Claim 8
Dependent Claim
45 words
A coupling as defined in claim 6 wherein said inner sleeve has a tubular extension coaxially surrounding said shaft while being in turn surrounded by said second fluid cylinder, said conduit means having another branch extending partly within said shaft and traversing said tubular extension.
Claim 9
Dependent Claim
47 words
A coupling as defined in claim 7 wherein said second fluid cylinder has a tubular inner wall surrounding said extension with a narrow intervening gap communicating with said other branch, said tubular wall having a passage connecting said gap with the interior of said second fluid cylinder.
Claim 10
Dependent Claim
64 words
A coupling as defined in claim 8 wherein said shaft is provided with a shoulder inside said clearance and wherein said tubular wall has a peripheral flange axially spaced from said second piston, further comprising first spring means between said abutment and said first piston and second spring means between said flange and said second piston for urging said pistons away from said sleeves.
Claim 11
Dependent Claim
25 words
A coupling as defined in claim 6 wherein said first piston is provided with projections bearing upon said first friction means at peripherally spaced locations.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |