192 clutches and power-stop control – Clutches – Operators
Patent
1998-02-13
2000-10-31
Marmor, Charles A
192 clutches and power-stop control
Clutches
Operators
192 482, F16D 1900, F16D 2700, F16D 3702
Patent
active
061388084
ABSTRACT:
A high-efficiency, electromagnetically actuated wrap spring clutch that is capable of generating a high torque output using a low power input is provided. The clutch includes a shaft extending along a longitudinal axis and a shaft hub disposed radially outwardly of the shaft and mounted to the shaft for rotation therewith. The clutch also includes an input hub that is disposed radially outwardly of the shaft and is rotatable relative to the shaft. The clutch further includes an annular control collar and a spring connected between the input hub and the control collar. The input hub, control collar, and spring rotate as a unit. Finally, the clutch includes an annular housing disposed radially outwardly of the shaft hub and a coil disposed with the housing. Both the control collar and the coil housing have annular flanges portions that are axially adjacent and extend in directions perpendicular to the longitudinal axis of the shaft. The geometry of the two flanges portions results in a high level of magnetic flux transfer between the housing and the control collar when a current is generated in the coil by application of an input power. The high level of magnetic flux transfer draws the control collar and the shaft hub into a tight frictional engagement even with a low power input to the clutch. As a result, the clutch is able to generate a high torque output despite a low power input. The inventive clutch is used in a vehicle speed control device.
REFERENCES:
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patent: 4913274 (1990-04-01), Nishimura
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patent: 5127502 (1992-07-01), Billings
patent: 5133437 (1992-07-01), Larson
patent: 5251735 (1993-10-01), Lamoureux
patent: 5687822 (1997-11-01), Arai
Dana Corporation
Marmor Charles A
Waddell Tisha D.
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