US3684069A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic disc clutch
Assignee: Individual
•
Filing: 1970-10-22
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Granted: 1972-08-15
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Expires: 1990-10-22
Abstract
Abstract A fixed annular hydraulic cylinder slidably receives an annular piston of a special, generally Z-shaped cross-section, which pilots at one of its parallel legs on a horizontal shoulder portion of the cylinder. The other piston leg serves as a positioning pilot surface for an annular needle bearing transmitting axial thrust to a pressure plate of a disc clutch stack. A large projected annular are of the piston is engaged by the needle bearing for high torque capacity, and a large diameter radial and axial thrust-sustaining ball bearing journals a driver hub of the clutch within the latter''s cylinder portion, at the axial side of the piston opposite the needle bearing.
Inventors
- 👤 Lawrence H Pray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:33
CPC Classifications
F; F16; F16D; F16D25/00; F16D25/08; F16D25/082
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
231 words
A fluid pressure operated clutch, comprising a fixed cylinder part providing a pressure space defined in part by parallel, radially spaced axial wall portions connected by a radial wall portion, from which radial portion the axial portions extend in opposite directions, a piston slidable in said pressure space, said piston having radially spaced axial portions extending in opposite axial directions, which piston portions are connected by a radial portion, being slidably engaged with said respective axial wall portions of the cylinder pressure space, a clutch unit releasably compressible axially by said piston under fluid pressure in said space, an annular bearing transmitting compressive force between said piston and clutch unit, said bearing being axially piloted on one of said axial piston portions and axially abutting said radial piston portion, and another annular bearing disposed in a space of said cylinder part on the axial side of said radial wall portion of the cylinder part opposite the piston, said cylinder part having an axially extending pressure passage to said pressure space located radially outwardly of said other bearing and the space receiving the latter, said first named bearing being a needle bearing and said other bearing being a ball bearing, the radially outermost of said axial piston portions having a pin element extending axially into said pressure passage of said cylinder part to oppose rotation of the piston relative to said part.
Claim 2
Dependent Claim
231 words
A fluid pressure operated clutch, comprising a fixed cylinder part providing a pressure space defined in part by parallel, radially spaced axial wall portions connected by a radial wall portion, from which radial portion the axial portions extend in opposite directions, a piston slidable in said pressure space, said piston having radially spaced axial portions extending in opposite axial directions, which piston portions are connected by a radial portion, being slidably engaged with said respective axial wall portions of the cylinder pressure space, a clutch unit releasably compressible axially by said piston under fluid pressure in said space, an annular bearing transmitting compressive force between said piston and clutch unit, said bearing being axially piloted on one of said axial piston portions and axially abutting said radial piston portion, and another annular bearing disposed in a space of said cylinder part on the axial side of said radial wall portion of the cylinder part opposite the piston, said cylinder part having an axially extending pressure passage to said pressure space located radially outwardly of said other bearing and the space receiving the latter, said first named bearing being a needle bearing and said other bearing being a ball bearing, the radially outermost of said axial piston portions having a pin element extending axially into said pressure passage of said cylinder part to oppose rotation of the piston relative to said part.
Claim 3
Dependent Claim
37 words
The clutch of claim 1, in which said clutch unit comprises axially alternating annular members radially overlapped in an annular radial zone common to said needle bearing and said radial portions of the piston and cylinder part.
Claim 4
Dependent Claim
36 words
The clutch of claim 1, in which said radial portion of said piston has a passage located radially inwardly of said pin element and communicating said Pressure space with a space occupied by said needle bearing.
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) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |