Drag Brakes - Constant Torque Drag Brakes - Machine Components Corporation

FEATURES

•	LONG LIFE UNDER CONTINUOUS SLIP
	CONDITIONS
•	UNIDIRECTIONAL OR BIDIRECTINAL OPERATION
•	SAME OR DIFFERENT CW AND CCW TORQUES
•	SMALL IN SIZE
	PRECISE AND STABLE LIMIT TORQUE
•	CALIBRATION
	Range: 1.0 to 600 oz.-in.
•	SAME TORQUE AT BREAKAWAY AS AT HIGH SLIP
	VELOCITIES
•	SLOT FOR PIN COUPLING
•	CORROSION RESISTANT MATERIALS

APPLICATIONS

•	DRAG TORQUES FOR SUPPLY REELS
•	SAFE HOLDING OF BACKDRIVING
	LOADS
•	FRICTION LOADING OF MECHANISMS
•	FRICTION LOADS FOR TESTING
	COMPONENTS

CO-B SERIES
200, 300, 500, 600, 650, 800, 900

Drag Brakes - Constant Torque Drag Brakes - Machine Components Corporation

CO-B SERIES
400, 700

MODEL NO.	*UPPER LIMIT TORQUE (oz.-in.)	•UNIT WT. (oz.)	A	B	C +.0010	D	E	F	G	H	J (max.)	K	L
CO-B-201 CO-B-202	9±1	.9	.93	.18	.1248 .1873	.67	.10	.29	#2-56	.38	.45 .33	.093	.63
CO-B-301 CO-B-302 CO-B-303	20±2	2.4	1.24	.21	.1873 .2498 .3123	.94	.10	.44	#4-40	.50	.68	.125	1.00
CO-B-401 CO-B-403	48±5	4.1	1.26	.23	.2498 .3123	.94	.10	.55	#6-32	.50	.68	.125	1.25
CO-B-500 CO-B-503	80±8	7.5	1.26	.23	.2498 .3123	.94	.10	.61	#6-32	.63	.68	.125	1.50
CO-B-600 CO-B-603	120±12	12.5	1.67	.25	.2498 .3123	1.33	.11	.80	#6-32	.63	.68	.125	1.87
CO-B-653 CO-B-654 CO-B-655	150±15	17.0	1.88	.29	.3123 .3748 .4998	1.47	.14	.80	#8-32	1.00	.74	.125	1.87
CO-B-702 CO-B-703 CO-B-704 CO-B-705	240±24	20.5	1.88	.29	.2498 .3123 .3748 .4998	1.47	.14	1.00	#8-32	1.00	.74	.188	2.25
CO-B-803 CO-B-804 CO-B-805	360±36 CW & CCW 480±48 CW or CCW	28	1.88	.32	.3123 .3748 .4998	1.44	.14	1.00	#10-32	1.00	.74	.188	2.62
CO-B-906 CO-B-907 CO-B-908	480±50 CW & CCW 600±60 CW or CCW	35	2.08	-	.6250 .7500 .8750	1.975	.15	1.25	1/4-20 (2 @ 120º)	3.00	1.15	.188	3.00
Federal Supply Code-15531 Covered by US Patents and Patents Pending

Brake Arrangement for Preventing Load Backdriving
The raising of weight quite often causes the problem of load backdriving. This problem is typically noticeable in an efficient transmission when power to the prime mover is interrupted, and the weight accelerates downward driving the transmission and prime mover backward. The brake arrangement illustrated on this page permits the use of an efficient transmission for raising the weight and prevents backdriving when power is interrupted.
A bidirectional brake with low drag torque in one direction and high drag torque in the other is a key element in this transmission. When the load is raised the brake exerts a light drag torque, in order to avoid an apprecialbe increase in motor power requirements. When the load is lowered the brake exerts a high drag torque which is somewhat in excess of the equivalent gravity pull on the weight. This brake torque prevents the weight from backdriving the transmission and motor when power is interrupted.

*Stock units are calibrated with equal values of cw and ccw slip torques corresponding to the value of tabulated Upper Limit Torque listed in the table above. Brakes can also be calibrated with slip torque values lower then the maximum values shown. When ordering the CW and CCW slip torque values may be speciefied anywhere from the full torque value listed, to a lower value of approximately 1/8 of this maximum, and may be specified the same or different for each of the two directions of rotation.
CO-B Series drag brakes are designed for long life slip conditions. The useful life of these elements is a function of transmitted torque and slip speed. Refer to page A-2 for the method of estimating life for a particular application. The service life factors are based on continuos duty testing on mildly hard wear surfaces. Service life may be extended by a factor of approximately 4X by specifying Nitride surface treatment in wear-critical applications.
All brakes of this type have a slot for engagment by a pin which prevents rotation by the stationary member. Dimension "F" indicates the recommended radial distance from the axis of the brake to the center of the pin. The axial penetration of the pin in the slot should provide for approxiamately .010" clearance to prevent bottoming.

ORDERING INFORMATION	Example
1. Model Number	CO-B-401
2. Specifiy Limit Torque(viewed from output end) CW Direction CCW Direction	48oz.-in. 7oz.-in..
3. Nitride surface treatment	Add prefix "H"
4. Optional clamp typehub	Add prefix "C"
5. Metric Size Bores Available on special order	Consult factory

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Constact Torque Drag Brake CO-B Series

Constact Torque Drag Brake
CO-B Series