DCB Tech Specs0 pages

21 DCB Clutch/Brake
Description and Technical Data
Description
Technical Data
The 21DCB combination clutch/brake package
was specifically designed for the can making industry to withstand the cyclic impact loads associated with high speed can extruding
machinery. A patented quick release air manifold
provides fast clutch/brake response; stopping
the ram to prevent die damage due to material
misfeed.
Torque Rating MrÊ at 85 psi (5,9 bar)
Clutch static torque: 75000 lb·in (8475 N·m)
Brake dynamic torque: 55000 lb·in (6215 N·m)
Operating Pressure
Maximum allowable pressure pr: 85 psi (5,9 bar)
The unit is ideally suited for high speed continuously running machinery requiring an extremely
fast stop.
The package consists of an air-actuated disc
clutch and a spring-applied disc brake. The
clutch disc is guided axially at its outside diameter by a series of bushings which attach to the
driving flywheel. The brake disc is reacted to the
machine frame by two reaction arms. The housing hub is pressed on and keyed to the driven
shaft.
When the cylinder is pressurized, the piston
clamps the clutch disc to the hub, transmitting
torque to the shaft. When the cylinder exhausts,
springs move the piston in the opposite direction, clamping the brake disc and stopping the
shaft. Overlapping cannot occur between clutching and braking.
Brake releasing pressure ps : 38 psi (2,6 bar)
Maximum SpeedË
1000 rpm
Inertia
Housing
: 90 lb·ft2 (3,8 kg·m2)
Clutch disc : 18 lb·ft2 (0,76 kg·m2)
Weight
Housing and manifold: 290 lb (130 kg)
Each friction disc : 52 lb (24 kg)
Air Cylinder VolumeÌ
With new linings : 55 in3 (0,8 dm3)
With worn linings: 80 in3 (1,3 dm3)
Brake Response to Full Torque
With new linings : 0.035 sec
With worn linings: 0.045 sec
Notes:
Ê Ratings are for worn in new linings. Decrease ratings 12% for worn linings.
Ë Maximum speed for non-cyclic operation. Maxi-
mum speed for single stroke operation is dependent upon thermal requirements. Dynamic balancing
required for operating speeds over 750 rpm.
Ì Absolute volume required per engagement.
Thermal Capacity
Non-Cyclic: 400000 ft·lb (542400 J)
Cyclic:
100 rpm: 1.5 HP (1,1 kW)
300 rpm: 2.1 HP (1,6 kW)
500 rpm: 2.6 HP (1,9 kW)
700 rpm: 3.1 HP (2,3 kW)
900 rpm: 3.4 HP (2,5 kW)
F - 11
Copyright Eaton Corporation, 1995, All rights reserved.