US3770087A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spline clearance reduction for couplings
Assignee: Rockford Dynatorq Inc
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Filing: 1972-05-12
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Granted: 1973-11-06
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Expires: 1992-05-12
Abstract
Abstract An electromagnetic coupling includes a driving member, a driven splined shaft member, a clutch torque transmitting member having a splined opening therein for receiving the driven splined shaft member, and a brake torque transmitting member having a splined opening therein for receiving the driven splined shaft member. First and second friction surfaces are provided for engagement with the clutch torque transmitting member and the brake torque transmitting member respectively. When the clutch torque transmitting member engages with the first friction surface the driving member will drive the driven member and when the brake torque transmitting member engages with the second friction surface the driven member will be braked. Spring means is provided connected to the clutch and brake torque transmitting members for exerting a torque moment on the clutch torque transmitting member in one direction about the driven splined shaft and on the brake torque transmitting member in an opposite direction about the driven splined shaft. The spring means acts to preload the clutch and brake torque transmitting members to prevent excessive spline clearance between the splined openings in the brake and clutch torque transmitting members and the splined shaft. The elimination of excessive spline clearance by the spring means decreases spline wear as excessive spline clearance results in brinelling and premature failure of the coupling.
Inventors
- 👤 R Jaeschke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:31
CPC Classifications
F; F16; F16D; F16D67/00; F16D67/02; F16D67/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
260 words
An electromagnetic coupling comprising rotatable driving and driven shaft members, one of said shaft members being a splined shaft, a clutch torque transmitting member having a splined opening therein for receiving said one splined shaft member, a brake torque transmitting member having a splined opening therein for receiving said one splined shaft member, a first friction surface connected to the other of said shaft members for rotation therewith, said clutch torque transmitting member and said first friction surface having an engaged position establishing a driving relationship between said driving and driven shaft members and a disengaged position permitting relative rotation between said driving and driven shaft members, a second friction surface, said brake torque transmitting member and said second friction surface having an engaged position establishing a braking force for retarding rotation of said driven shaft member and a disengaged position permitting rotation of said driven shaft member, and spring means connected between said clutch torque transmitting member and said brake torque transmitting member for establishing a preloading force tending to rotate saId clutch torque transmitting member in a first direction and said brake torque transmitting member in a second direction opposite said first direction about said one splined shaft member to urge one side of said splined openings of said clutch torque transmitting member and an opposite side of said splined openings of said brake torque transmitting member into tight engagement with said one shaft member to eliminate excessive spline clearance between said splined openings of said clutch and brake torque transmitting members and said one splined shaft member.
Claim 2
Dependent Claim
260 words
An electromagnetic coupling comprising rotatable driving and driven shaft members, one of said shaft members being a splined shaft, a clutch torque transmitting member having a splined opening therein for receiving said one splined shaft member, a brake torque transmitting member having a splined opening therein for receiving said one splined shaft member, a first friction surface connected to the other of said shaft members for rotation therewith, said clutch torque transmitting member and said first friction surface having an engaged position establishing a driving relationship between said driving and driven shaft members and a disengaged position permitting relative rotation between said driving and driven shaft members, a second friction surface, said brake torque transmitting member and said second friction surface having an engaged position establishing a braking force for retarding rotation of said driven shaft member and a disengaged position permitting rotation of said driven shaft member, and spring means connected between said clutch torque transmitting member and said brake torque transmitting member for establishing a preloading force tending to rotate saId clutch torque transmitting member in a first direction and said brake torque transmitting member in a second direction opposite said first direction about said one splined shaft member to urge one side of said splined openings of said clutch torque transmitting member and an opposite side of said splined openings of said brake torque transmitting member into tight engagement with said one shaft member to eliminate excessive spline clearance between said splined openings of said clutch and brake torque transmitting members and said one splined shaft member.
Claim 3
Dependent Claim
37 words
An electromagnetic coupling as defined in claim 1 wherein said spring means comprises a coil spring connected between said brake and clutch torque transmitting members to preload said brake and clutch torque transmitting members in opposite directions.
Claim 4
Dependent Claim
395 words
An electromagnetic coupling comprising rotatable driving and driven shaft members, one of said shaft members being a splined shaft, a clutch torque transmitting member having a splined opening therein for receiving said one splined shaft member, a brake torque transmitting member having a splined opening therein for receiving said one splined shaft member, a first friction surface connected to the other of said shaft members for rotation therewith, said clutch torque transmitting member and said first friction surface having an engaged position establishing a driving relationship between said driving and driven shaft members and a disengaged position permitting relative rotation between said driving and driven shaft members, a second friction surface, said brake torque transmitting member and said second friction surface having an engaged position establishing a braking force for retarding rotation of said driven shaft member and a disengaged position permitting rotation of said driven shaft member, spring means connected to said clutch torque transmitting member and said brake torque transmitting member for establishing a preloading force tending to rotate said clutch torque transmitting member and said brake torque transmitting member in opposite directions about said one splined shaft member to urge said splined openings of said clutch and brake torque transmitting members into tight engagement with said one shaft member, said spring means exerting said force to eliminate excessive spline clearance between said splined openings of said clutch and brake torque transmitting members and said one splined shaft member to reduce wear between said splined portions of said torque transmitting members and said one splined shaft member upon repeated engagement between said clutch torque transmitting member and said friction surface and said brake torque transmitting member and said second friction surface, and said clutch torque transmitting member includes first and second pin members attached thereto in a spaced apart relationship, said brake torque transmitting member includes third and fourth pin members attached thereto in a spaced apart relationship, and said spring means includes a first spring member attached to said first and third pin members and a second spring member attached to said second and fourth pin members, said spring members and pin members cooperating to transfer the forces of said spring to said clutch and brake torque transmitting members to establish said torque moments thereon to preload said clutch and torque transmitting members in opposite directions about said one splined shaft member.
Claim 5
Dependent Claim
395 words
An electromagnetic coupling comprising rotatable driving and driven shaft members, one of said shaft members being a splined shaft, a clutch torque transmitting member having a splined opening therein for receiving said one splined shaft member, a brake torque transmitting member having a splined opening therein for receiving said one splined shaft member, a first friction surface connected to the other of said shaft members for rotation therewith, said clutch torque transmitting member and said first friction surface having an engaged position establishing a driving relationship between said driving and driven shaft members and a disengaged position permitting relative rotation between said driving and driven shaft members, a second friction surface, said brake torque transmitting member and said second friction surface having an engaged position establishing a braking force for retarding rotation of said driven shaft member and a disengaged position permitting rotation of said driven shaft member, spring means connected to said clutch torque transmitting member and said brake torque transmitting member for establishing a preloading force tending to rotate said clutch torque transmitting member and said brake torque transmitting member in opposite directions about said one splined shaft member to urge said splined openings of said clutch and brake torque transmitting members into tight engagement with said one shaft member, said spring means exerting said force to eliminate excessive spline clearance between said splined openings of said clutch and brake torque transmitting members and said one splined shaft member to reduce wear between said splined portions of said torque transmitting members and said one splined shaft member upon repeated engagement between said clutch torque transmitting member and said friction surface and said brake torque transmitting member and said second friction surface, and said clutch torque transmitting member includes first and second pin members attached thereto in a spaced apart relationship, said brake torque transmitting member includes third and fourth pin members attached thereto in a spaced apart relationship, and said spring means includes a first spring member attached to said first and third pin members and a second spring member attached to said second and fourth pin members, said spring members and pin members cooperating to transfer the forces of said spring to said clutch and brake torque transmitting members to establish said torque moments thereon to preload said clutch and torque transmitting members in opposite directions about said one splined shaft member.
Claim 6
Dependent Claim
18 words
An electromagnetic coupling as defined in claim 3 wherein said first and second spring members comprise coil springs.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |