Rotational control apparatus

192 clutches and power-stop control – Clutch and brake – Sliding operation

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Details

192 482, 192 484, 192 4891, 192 7012, 19211321, 19211323, 310105, F16D 250638, F16D 6704, F16D 4700, F01P 702

Patent

active

056367198

ABSTRACT:
Rotational control apparatus in the forms of fan clutches (A, A') are shown including an eddy current drive (224). Specifically, the eddy current drive (224) includes a plurality of permanent magnets (226) mounted circumferentially spaced and with alternating polarity by a holder (228) to the input or output of the clutch (A, A') and a magnetically conductive ring (242) mounted to the other of the input or output of the clutch (A, A'). Thus, the output portion and the fan blades mounted thereto are driven at engine speeds when the clutch (A, A') is air actuated and are driven at a rotational speed less than engine speed by the eddy current drive (224) when the clutch (A, A') is not air actuated and without separate controls for the eddy current drive (224). A housing (62) comprises the output portion of the clutch (A) which is rotatably mounted by a bearing (58) to the hub portion (24) of a friction disc (28) which comprises the input portion of the clutch (A). In other forms, the output portion of the clutch (A') is in the form of a hub (20') rotatably mounted on a stationary shaft (24') and the input portion is in the form of a sheave (50') rotatable relative to the hub (20') and the shaft (24'). Additionally, the hub (20') can be braked by rotatably relating the hub (20') to the shaft (24'). In one form, the friction ring (252) includes peripheral gear teeth (256) in slideable gearing relation with gear teeth (250) formed in the housing (62) and is formed of fiber brake material to act as a dampener between the friction disc (28) and the housing (62) to absorb torsional vibration.

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