Wichita Clutch Low Inertia (LI) High Torque Clutch - Manual (Page 2)

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Air Tube Disc Clutches and Brakes
P-1100-WC 1/12 Wichita Clutch 800-964-3262 45
Data
Rated Tonnage . . . . . . . . . . . . . . . . . . . . As Re quired
Crankshaft Speed . . . . . . . . . . . . . . . . . 30 RPM
(Continuous Run)
Clutch-Brake Shaft RPM . . . . . . . . . . . . 204 RPM
Crankshaft Speed . . . . . . . . . . . . . . . . . 30 RPM
Degrees of Crank to start . . . . . . . . . . . 90°
Degrees of Crank to stop . . . . . . . . . . . 90°
Connecting Rod Length = b . . . . . . . . . 36 in.
Stroke. . . . . . . . . . . . . . . . . . . . . . . . . . . 6 in.
1/2 of Press Stroke (throw) = a . . . . . . . 3 in.
WR 2 of Parts on Backshaft . . . . . . . . . . 78.2 lb.ft. 2
WR 2 of Parts on Crankshaft . . . . . . . . . . 39,091 lb.ft. 2
Material Shear Stress. . . . . . . . . . . . . . . 45,000 PSI
Blade Width . . . . . . . . . . . . . . . . . . . . . . 60 in.
Shaft Size . . . . . . . . . . . . . . . . . . . . . . . . 4 in.
Maximum Material to be Sheared . . . . . x
Air Pressure Available . . . . . . . . . . . . . . 100 PSI
Calculations
Torque @ Crank
= (Material Shear Stress) (x) (Blade Width) (Torque Arm)
Torque arm = y = (x) (tan α)
c = a + b – x
= 3 + 36 – .25
= 38.75 in.
Cos α
=
b 2 + c 2 – a 2
2 bc
=
(36) 2 + (38.75) 2 – (3) 2
(2) (36) (38.75)
= .99948
α = 1.8478˚
Torque Arm = y = (c) (tan α )
= (38.75) (tan 1.8478˚)
= (38.75) (.03226)
= 1.25 in.
Torque @ Crank
= (Material Shear Stress) (x) (Blade Width) (Torque Arm)
= (45,000) (.25) (60) (1.25)
= 843,750 lb.in.
Torque @ Clutch
= (Torque @ Crank) ÷
Clutch RPM
Crankshaft RPM
= 843,750 ÷
204 RPM
30 RPM
= 124,081 lb.in.
Selection Example