Oil Cooled Multiple Disc Clutches and Brakes - Airflex magnetic clutches and brakes - Airflex - #1

Element Descriptions

General

Airflex magnetic clutches and brakes are sta­tionary field, multiple-disc units actuated by electromagnetic force. The stationary field elimi­nates the need for collector rings and brushes, thus doing away with mounting and service problems. The units can be furnished with disc packs for either wet or dry operation. Operation in oil is recommended where high speeds, high cyclic rates and heavy loads are encountered and where wear must be minimized.

Clutch design is illustrated in the component parts diagram. The coil 5 and coil housing 6 are supported and held in alignment by the inner race of bearing 3. These components are held stationary by holding arm 1. Items 7, 8,15,16, 18 and 19 are mechanically attached to clutch body 2 which in turn is keyed to the driving shaft. Driving discs 15 and friction discs 17 are disengaged by released springs 18.

Energizing coil 5 sets up a magnetic flux circuit which attracts armature 8 towards outer field ring 7, compressing springs 18 and clamping the disc pack, causing driven gear 14 and its shaft to rotate.

De-energizing coil 5 disrupts the magnetic flux circuit allowing release springs 18 to disengage driven friction discs 17.

Type SB brakes are spring-applied magneti­cally-released units. Design is illustrated in the components parts diagram. Items 1, 2, 3,9 and 12 are mechanically connected and are reacted to a stationary member by screws 10. Gear 7 and friction discs 8 are attached to the shaft to be braked.

Energizing coil 2 attracts armature 13, which in turn compresses springs 1 and releases the fric­tion discs 8.

De-energizing the coil allows springs 1 to clamp the friction disc pack, braking the shaft.

Type SB brakes are available in two sizes. Torque ratings to 396 lbin (45 Nm).

Type SC clutches are available in seven sizes. Torque ratings up to 8250 lbin (932 Nm)

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Copyright Eaton Corporation, 1993, All rights reserved.