US3751941A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Torque-limiting clutch
Assignee: AGCO Ltd
•
Filing: 1971-09-20
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Granted: 1973-08-14
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Expires: 1991-09-20
Abstract
Abstract A torque limiting clutch formed of concentric friction members, upon overload, one member slips relative the other, generating heat causing the elements to expand. The outer clutch member expands more rapidly than the inner resulting in a reduction of the frictional forces between the members and a corresponding reduction in torque.
Inventors
- 👤 R Stiff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:45
CPC Classifications
F; F16; F16D; F16D7/00; F16D7/02; F16D1/00; F16D1/06; F16D1/08; F16D1/09; F16D1/093; F16D1/095
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
168 words
A torque-limiting clutch comprising inner and outer friction members, the outer friction member having an annular crosssection and comprising cooperating wedge formations in the form of tapered inner and outer tubular members, the inner tubular member having a higher rate of thermal expansion than the inner friction member, a drive sprocket mounted at one end of the outer tubular member so that the outer friction member has minimum thickness at the zone of frictional engagement with the inner frictional member, said inner friction member having a substantially cylindrical outer periphery which is adapted to be surrounded by and frictionally engage the inner periphery of the inner tubular member of the outer friction member, adjustment means to provide a normal reaction between the inner and outer friction members including screw threads on the inner tubular member and an associated threaded adjustment member with locking means and a face adapted to abut the outer tubular member and oil-retaining covers to connect the ends of the inner and outer friction members.
Claim 2
Dependent Claim
168 words
A torque-limiting clutch comprising inner and outer friction members, the outer friction member having an annular crosssection and comprising cooperating wedge formations in the form of tapered inner and outer tubular members, the inner tubular member having a higher rate of thermal expansion than the inner friction member, a drive sprocket mounted at one end of the outer tubular member so that the outer friction member has minimum thickness at the zone of frictional engagement with the inner frictional member, said inner friction member having a substantially cylindrical outer periphery which is adapted to be surrounded by and frictionally engage the inner periphery of the inner tubular member of the outer friction member, adjustment means to provide a normal reaction between the inner and outer friction members including screw threads on the inner tubular member and an associated threaded adjustment member with locking means and a face adapted to abut the outer tubular member and oil-retaining covers to connect the ends of the inner and outer friction members.
Claim 3
Dependent Claim
28 words
A torque-limiting clutch as claimed in claim 1 in which said inner friction member is connected to a co-axial shaft through a tapered bush keyed to the shaft.
Claim 4
Dependent Claim
144 words
A torque-limiting clutch comprising an outer annular friction member mounted so as to be free to expand and an inner friction member arranged to fit within the outer friction member in frictional engagement therewith, adjustment means for adjusting the torque that can be transmitted between the inner and outer friction members without slipage, torque input means connected to one friction member, and torque output means connected to the other friction member, wherein the coefficients of thermal expansion of the friction members and the thermal capacitites and thermal conductivities of the friction members and the components of the clutch to which they can conduct heat are such that the generation of heat between the friction members causes greater thermal expansion of the outer friction member than of the inner friction member, and oil-retaining covers connected to the ends of the inner and outer friction members.
Claim 5
Dependent Claim
144 words
A torque-limiting clutch comprising an outer annular friction member mounted so as to be free to expand and an inner friction member arranged to fit within the outer friction member in frictional engagement therewith, adjustment means for adjusting the torque that can be transmitted between the inner and outer friction members without slipage, torque input means connected to one friction member, and torque output means connected to the other friction member, wherein the coefficients of thermal expansion of the friction members and the thermal capacitites and thermal conductivities of the friction members and the components of the clutch to which they can conduct heat are such that the generation of heat between the friction members causes greater thermal expansion of the outer friction member than of the inner friction member, and oil-retaining covers connected to the ends of the inner and outer friction members.
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) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |