Solenoid Operated Clutch Brakes

FEATURES • SOLENOID OPERATED INDEXING • UP TO FOUR STEPS PER REVOLUTION • INDEXING ACCURACY ±1° • NON-CUMULATIVE INDEXING ERROR • UNI-DIRECTIONAL ROTATION, CW CCW • NON-REVERSING (OUTPUT CANNOT BE BACK DRIVEN) • INPUT DRIVE OPTIONS: A: PULLEY MODULE B: IN-LINE COUPLING • PHASING CLAMP LOCKS AND INFINITELY PHASES CLUTCH OUTPUT WITH SHAFT • ANTI-OVERRUN OPTION FOR CONTROL OF OVERHAULING LOADS • SOLENOID VOLTAGE OPTIONS: 12, 24VDC, 110VAC, 60 HZ • TORQUE CAPACITIES: 50 to 500 LB.-IN.

OPERATION The CNR clutch brake consists of three parts. The input drum, the output drum, and the brake drum. A clutch spring joins the input drum to the output drum. The clutch spring has a built in tang which engages a slot in the control collar. When the control collar is stationary the clutch spring allows the input to rotate freely while the output drum remains stationary. When the solenoid (actuator) is energized the control collar is released and permits the clutch spring to wrap down on the input drum. The input is now directly connected to the output. When the solenoid is deenergized the latch engages and stops the control collar causing the clutch spring to unwind from the input drum.The output coasts forward winding the brake spring down on the stationary element of the brake and bringing the output to a halt. The anti-backup spring prevents the output from being backdriven.

Model No. *Torque Capacity (lb.-in) Tcat *Kinetic Energy Factor (lbs.-in) *Moment of Inertia I cat x 10-6 (in.-lbs.sec2) A +.0015 I. B C D E F G H I J K L M N +.003 O P CNR-5-25 CNR-5-31 50 2.0 90 .2500 .3125 1.00 2.00 .63 3.00 2.00 1.81 .07 .09 .15 .12 1.25 .10 .094 .50 1.00 CNR-12-37 CNR-12-50 125 5.0 500 .3750 .5000 1.25 2.25 1.00 3.70 2.30 2.11 .11 .09 .19 .13 1.90 .12 .126 .87 1.63 CNR-20-50 CNR-20-62 200 7.8 900 .5000 .6250 1.38 2.50 1.23 4.00 2.45 2.52 .12 .09 .19 .15 2.11 .12 .126 1.01 1.88 CNR-50-75 CNR-50-100 500 19.3 2300 .7500 1.0000 1.62 2.85 1.25 4.30 2.68 3.33 .12 .09 .30 .18 2.58 .20 .188 1.44 2.24 Federal Supply Code - 15531    1. Corresponding millimeter size bores are available as options
OUTPUT (ANTI-OVERRUN "N" OPTION ) The uni-directional characteristics of the clutch spring inhibits it ability to control the speed of the output when subjected to overhauling loads. An overhauling torque could cause the output to accelerate and run ahead of the input prior to the completion of the indexing step. Consequently, higher braking forces would be required to bring the output to a stop. The anti overrun feature utilizes a uni-directional spring to couple the output to the input. This spring prevents the output from running ahead of the input. ORDERING INFORMATION                                       CNR-5 Model of Clutch Brake 25 Bore Dia. .2500 CW Clockwise Rotation I Number of index steps 1,2,3, or, 4 N Anti-Overrrunning Option 24 24VDC Example CNR-5-25-CW-I-N-24
	TRANSMISSION COMPONENTS
	INPUT PULLEY MODULES ("P" OPTION) The input pulley modules are designed to provide a means for driving the clutch brake while isolating the clutch brake from the radial loads due to the belt tension. A ball bearing designed into the pulley module supports the driving radial loads. Because of this design, the clutch bearings are effectively protected from the belt tension. Standard input pulleys are available in both 1/5" and 3/8" pitches. All input pulleys incorporate a three dog coupling to transmit the torque from the pulley to the clutch brake.
Model No. A B C D E F P   NO. OF GROOVES 16 17 18 19 20 21 22 24 28 32 36 40 CNR-5-25-P CNR-5-31-P .2500 .3125 .68 .17 .81 .12 8-32 1/5 G H     1.126 NA 1.190 NA .1.253 NA .1.317 1.56 1.381 1.63 1.508 1.75 1.763 2.00 2.017 2.25 2.272 NA 2.526 NA CNR-12-37-P CNR-12-50-P .3750 .5000 .89 .17 1.00 .14 8-32 3/8 G H 1.880 NA 1.999 NA 2.119 NA 2.238 2.63 2.537 2.632 2.596 2.88 2.596 2.88 2.835 3.13 3.312 3.63 3.790 4.06 4.267 4.69 4.745 5.00 CNR-20-50-P CNR-20-62-P .5000 .6250 .94 .19 1.25 .19 10-32 3/8 G H     2.119 NA 2.238 NA 2.537 NA 2.596 2.88 2.596 2.88 2.835 3.13 3.312 3.63 3.790 4.06 4.267 4.69 4.745 5.00 CNR-50-75-P CNR-50-100-P .7500 1.0000 1.00 .19 1.63 .25 10-32 3/8 G H           2.596 NA 2.596 NA 2.835 3.13 3.312 3.63 3.790 4.06 4.267 4.69 4.745 5.00
	IN LINE COUPLING MODULE ("D" OPTION) The in line coupling module is designed to transmit power directly from an input shaft to the input of a CNR clutch brake mounted in line on an output shaft. The in line coupling module consists of two assemblies, a dog drive clamp which is installed on the input drive shaft, and a coupling tube which interfaces the clamp and the input to the CNR clutch brake. During installation the clamp part of the coupling is placed on the input shaft, the clutch brake is placed on the output shaft and the coupling tube is placed between the clamp and the input to the CNR clutch brake. When all of the assemblies are properly positioned, phased and locked the coupling tube is to have .003"-.010" of axial play. See figure 4 for a typical installation of the CNR using the in line coupling module.
MODEL NO OPTION "D" A +.001 D CNR-5-25-DP CNR-5-31-D .2498 .3123 1.00 CNR-12-37-D CNR-12-50-D .3748 .4998 1.63 CNR-20-50-D CNR-20-62-D .4998 .6248 1.88 CNR-50-75-D CNR-50-100-D .7498 .9998 2.24
	PHASING CLAMP ( "CL" OPTION ) The phasing clamp provides a means for driving the output shaft and for setting its angular position relative to the clutch output. It eliminates the need for a drive pin often used to transfer power from the clutch to the output shaft. The phasing clamp is mounted on the output shaft. The dog engages the slot in the clutch output. With the clamping screws loose the output shaft may be freely rotated to desired stopping position. Tightening of the clamp screws locks the clutch to the output shaft.
Model No. A B C D E F -.002 G CNR-5-25-CL CNR-5-31-CL .2498 .3123 .95 .56 .63 .42 .32 .092 8-32 CNR-12-37-CL CNR-12-50-CL .3748 .4998 1.13 1.25 .75 .50 .38 1.24 10-32 CNR-20-50-CL CNR-20-62-CL .4998 .6248 1.25 1.38 .75 .88 .50 .38 1.24 10-32 CNR-50-75-CL CNR-50-100-CL .7498 .9998 1.50 1.75 1.00 1.25 .58 .38 .186 10-32
INSTALLATION
Four installation arrangements for the CNR clutch brakes are described. In all four cases the clutch brake is mounted on the output shaft. For phasing the output shaft to the clutch ouput the following procedure is recommended. • Loosen the screws of the phasing clamp. • Rotate the input of the clutch brake until the control collar lobe contacts the latch and the input is decoupled. • Rotate the output shaft to the desired angular position and tighten phasing clamp screws.
Figure 1 Clutch brake with pulley module is mounted on output shaft between its supporting bearings Figure 3 Clutch brake with pulley module is mounted on the overhung part of the output shaft for easy access to the belt. Figure 2 Clutch brake with pulley module is mounted on the overhung part of the output shaft near one of the support bearings of the output shaft to minimize the bearing load. Figure 4 Clutch brake is driven by an in-line clamp coupling

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