Wichita Clutch CCB - Combination Clutch Brake Unit - Manual (Page 4)

A
Combination Clutch/Brake
P-1100-WC 1/12 Wichita Clutch 800-964-3262 13
( )
4. Calculate energy input required for the
combination clutch/brake.
a. Kinetic Energy = (WR 2 )(CCB RPM) 2
5,873
KE =
(1041)(204) 2
= 7,376 lbs.ft.
5,873
b. Maximum energy input to the CCB 600
is 14,229 ft.lbs. Therefore, CCB 600 has
sufficient energy input capacity.
5. To determine the Heat Horsepower
Capacity of the CCB at backshaft speed,
you need the following in for ma tion:
a. Heat HP capacity of CCB 600 @
200 RPM. (Look up capacity under the 200
RPM heading on page 16.)
Heat HP = 3.7 Heat HP @ 200 RPM.
b. To determine the Cycles Per Minute
Ca pac i ty, you need the following
in for ma tion:
(Heat HP @ CCB speed) (1.9 x 10 8 )
(WR 2 ) (RPM) 2
or 3.7 (1.9 x 10
8 )
(1041) (204) 2
= 16 CPM
Final Selection:
CCB 600 with 1/2 spring compliment. Also available
with shrink disc shaft mounting.
(See pages 18–19 for various mounting
arrangments).
Note:
This application example is for preliminary
sizing only. Contact a Wichita Sales Engineer
or the factory for final selection.
Application selection torque = the required
torque of 73,529 lb. in. x 1.5
= 110,294 lb.in. (Application Duty Factor for
“Geared Punch Press”, page 16.
Preliminary selection of CCB based on clutch
torque is the CCB 600 with 50% spring
compliment. The clutch torque for this model
is 124,350 lb.in. @ 80 PSI.
d. Maximum bore for CCB 600 is 5.0 in. bore
acceptable.
3. To determine application brake torque necessary
to stop the equipment the following information
is needed:
a. The inertia of rotating parts referred to the
backshaft. It is given in the application data
that the inertia (WR
2 ) of parts on the
crankshaft is 39,091 lb. ft. 2 at 30 RPM. To
calculate WR 2 referred to the backshaft:
30 RPM of Crankshaft 2
x 39,091 lb.ft. 2
204 RPM of Backshaft
= 845 lb.ft. 2 @ 204 RPM
Total WR 2 referred to backshaft is:
845 lb.ft. 2 + 78 lb.ft. 2 = 923 lb.ft. 2
(WR 2 of parts on backshaft from application
data)
Total WR 2 to start and stop is:
923 lb.ft. 2 + 118 lb.ft. 2 = 1041 lb.ft. 2
(WR 2 of CCB-600 from page 15)
b. The brake stop time required is 120°. (Based
on rotation at 30 RPM).
Angle to Stop 60
Stop Time =
360 crankshaft RPM
120 60
= = .5 sec.
360 30
c. Required deceleration torque =
(WR 2 ) (CCB RPM) (1041) (204)
or
(25.6) (Stop Time sec.) (25.6)(.5)
= 16,590 lb.in.
d. Application brake torque =
(18,466) (1.5) or 27,700 lb.in.
The CCB 600 has a rated brake
torque capacity of 35,850 lb.in.
with 50% spring compliment.
WE9289 P1100WC PCB Catalog v4_NEW_P-1100-WC.qxd 1/31/12 10:51 AM Page 13