Wichita Clutch SV - Standard Ventilated Clutch User Manual

Standard Vent Clutches

Coupling Clutches

The Wichita Standard Vent Com bi na tion
Clutch-Coupling is designed for reliable
in-line power transmission. The simple
air-tube design, with small air vol ume,
speeds en gage ment and dis en gage ment.
It is un af fect ed by centrifugal force and has
no self-energization like drum clutch
de signs. Ideally suited for large inertia loads
where smooth controlled starts are needed.

See pages 131 thru 135.

Grinding Mill Clutches

Wichita Grinding Mill Clutches are
spe cial ly designed to provide
quick, smooth starts with limited
current surge for heavy duty
grinding mills. The clutch
is adapt able to remote control
allowing centralized op er a tion
through simple air or electric
circuits.

See pages 136 thru 143.

122 Wichita Clutch 800-964-3262

P-1100-WC 1/12

Application Guidelines

Reliable, trouble-free
Wichita Standard Vent
Clutches handle
maximum loads on
drilling rigs.

Standard Vent Clutches

Typical Applications

Wichita ATD-342 Clutches allow
smooth acceleration of coil
transporter.

Wichita Grinding Mill

Clutches provide shock-free

start-up of large inertia

loads.

Clutch selection is made by knowing the
application horse pow er/100 RPM, the
available air pressure, required torque and

the clutch heat horse pow er. The Re quire ments
Table (Chart A) gives application factors
ranging from light duty (the A group) to extra
heavy duty (the D group).

Chart A

Field of Application Group A Group B Group C Group D

Pumps Centrifugal Reciprocating compressors Reciprocating compressors
compressors over 2 cylinders, one or two cylinders
centrifugal fans & blowers

Agitators Liquid Semi-solid Solids
Brick Brick press, extruder, pug mill

manufacturing
Can & bottling machine Bottle-can feeders, filling, mixers
Engine driven equipment Crane, hoist, engine Crowd
Grinding mills Ball-rod-sag-pebble Crushers, shakers
Lumber processing Yarder Carriages, conveyers Chipper, logger
Marine Propulsion clutch CP wheel Shaft brakes, propulsion

reversing type, anchor winch
Bulk material Conveyors evenly loaded, Feeders Elevators

handling line shaft evenly loaded
Metal production & Coilers, slitters, press brake, Draw bench, rolling mill, Hammer mill, forming

metalforming non-geared press, geared press shear, back geared press, press, forging press,
deep draw press, transfer header press, knuckle press
press, toggle press

Paper industry dryer Fourdrinier to 500 FPM, Fourdrinier to 1800 RPM
sections & calenders paper mill plane & press selections, calenders
consult factory smoothing press & dryers

Petroleum Drilling & service rig master Mud pumps,
production clutches, compound clutches, PTO clutches
rotary, drum

Rubber Transfer machines Banberry mixer, drum mixer, Centrifuge
manufacturing evenly loaded extruder, calender

E

P-1100-WC 1/12

Wichita Clutch 800-964-3262 123

Standard Vent Clutches

Coupling and Grinding Mill Clutches

Selection

Clutch sizes are affected by the following
variables:

1. Machines that operate under smooth loads
require smaller clutches. These machines
are driven by either multi-cylinder high
speed engines or electric motors with
reduced starting current.

2. Drives that require high starting current
motors will require clutches with sufficient
torque to prevent excessive slipping while
starting.

3. Starting torque may be high, which
re quires fast clutch response time to
transmit the required torque or extended
clutch slip time to protect the prime mover.

4. Starting torques may be very low
com pared to the normal torque, which
may result in the clutch not being fully
pres sur ized prior to the time of torque
re quire ment. This will cause the clutch
to over-heat from slippage. Clutch inflation
time in this instance is very important.

5. Clutches on most machines are designed
to slip prior to damage from shockloads.
As a result, the clutch may require periodic
maintenance; therefore the clutch should
be located, for easy access, in the power
train. Clutches should also be located for
maximum cooling air. In instances where
this is not possible, forced air cooling may
be nec es sary for extended clutch life.

6. Safe operating speeds for clutches should
be maintained in design. The following
material specifications are rec om mend ed
for safe operation. The max i mum speeds
shown are safe op er at ing speeds based
upon years of Wichita experience.

Maximum Clutch
Contact Velocity FPM Material

6,000 (Recommended upper limit for slip) cast iron
9,000 ductile iron
12,000 steel

These velocities are measured at the nominal
outside diameter of the clutch plates.

Selection Example

To properly select a clutch for your ap pli ca tion,
the following information is re quired:

1. Application horsepower

2. Re quired air pressure

3. Required torque

4. Clutch heat horsepower

5. Shaft diameter

Chart A (page 123) gives application re quire ­ments ranging from light duty (the A group) to
extra heavy duty (the D group). This chart will
give the initial se lec tion which is then compared
with the selection made using the Clutch Heat
Horsepower Chart B and the Clutch area (see
“lining area” column) in the Spec i fi ca tion Table
(Chart C, page 125-126).

Machine required:

Rock crusher (Grinding mill)
(Group D duty requirement)

PSI

2

HP

2

in.

WR2................................1,000 lb.ft.

RPM ..................................1,800

Clutch Slip Time ................6 sec.

HP......................................325 (diesel 8

............................................ cylinder)

Available air pressure ...

.....120

Clutch must slip while bringing equipment
up to speed.

Chart B
Clutch heat horsepower absorption rate*

ft.lb.

in.

Heat Input

2

Slip

Time

Seconds

0 to 1 380 .7
2 617 .56
3 820 .5
4 1,000 .45
5 1,175 .43
6 1,330 .4
7 1,485 .38
8 1,630 .37
9 1,770 .36

10 1,900 .34

* This chart is for use when clutch is at ambient temperature of 120°

F max.

124 Wichita Clutch 800-964-3262

P-1100-WC 1/12

Standard Vent Clutches

Coupling and Grinding Mill Clutches

Calculations

Engine torque =

RPM 1800

Engine torque = 11,375 lb.in.

Clutch torque required while slipping:

Clutch torque =

(g) (t

W = Weight to be accelerated lb.
R = Radius of gyration ft.
g = Acceleration of gravity ft./sec.
ts= Time of slip, in seconds
T

= Clutch torque = 11,707 lb.in.

c

Clutch heat HP is 1/2 of the total
area in the diagram.

Clutch heat HP =

63,000

Clutch heat HP =

63,000

From Clutch Heat Horsepower (Chart B)
for a 6 second start:

2

HP / in.

Area required =

.4

= .4

To properly select a clutch for this rock
crusher application, the following
information is required:

1. Application horsepower

2. Re quired air pressure

3. Required torque

4. Clutch heat horsepower

5. Shaft diameter

The Specification Table on pages 126-127 gives
ap pli ca tion factors ranging from light duty (the A
group) to extra heavy duty (the D group). This
chart will give the initial se lec tion which is then
compared with the selection made using the
Clutch Heat Horsepower Chart and the Clutch
Area Chart.

(HP) (63,000) =(325) (63,000)

2

(WR

) (RPM) (π) lb.in.

) (2.5)

s

2

2

(T

c) (input RPM)

(11,375) (1,800)

(1/2)

(1/2)

= 162.5 HP

162.5
= 406 in.

2

How to select

Clutch torque

energy
rotating
mass

Torque

clutch

heat horsepower

RPM

1. The area required is 406 inches. Consult the
column head “Lining Area” in Spec i fi ca tion
Table (pages 126-127). Applicable clutch es
chosen are:
ATD-218, 528 in.
ATD-314H, 504 in.

2

; ATD-124H, 574 in.2;

2

2. Determine the application
horsepower necessary:

HP/100 RPM =

1,800

325

(100) HP

HP/100 = 18 HP/100 RPM

Clutches selected with this application
horsepower are as follows:

ATD-214H 18 HP/100 RPM, ATD-314H
27 HP/100 RPM, ATD-118 21 HP/100 RPM.
The ATD-314 is selected as having both
sufficient area and torque with min i mum
diameter.

Contact velocity =

12

(clutch size) (π) (1,800)

= 6,597 ft./min.

Ductile material required.

Note: This application example is for
pre lim i nary sizing only. Contact a Wichita Sales
Engineer or the factory for final selection.

Use engine torque for calculations.
When selecting the proper clutch, heat must
be considered. When a clutch is slipped under
load, heat is gen er at ed within the clutch. This
heat as shown to the left is equal to the energy
of the mass that was ac cel er at ed to speed by
the clutch.

Input RPM

E

P-1100-WC 1/12

In applications where thermal re quire ments are
of concern, consult factory for special
ventilated and super ventilated clutch options.

Wichita Clutch 800-964-3262 125

Standard Vent Clutches

Coupling and Grinding Mill Clutch Selection

Specifications

Chart C

Recom- Hi-Spd.

Slip Torque mended Airtube
Model lb.in. Clear- Max. Total Total Lining

Size at 100 PSI ances Speed Wt. WR2 Area

ATD– .3 CF A B C D Inches RPM lb. lb. ft.2 Wt. WR

108 STVC 7,000 11.1 8 4 2 1/16-1/8 3,000 36 3 8 1.2 56

208 STVC 14,000 22.2 16 8 4 3/32-5/32 3,000 58 38 18 1.8 112
308 STVC 21,000 33.3 24 12 6 3/32-5/32 3,000 80 5.1 28 2.4 168
111 STVC 15,900 25 18 9 5 1/16-1/8 2,800 65 11 20 5 114
211 STVC 31,800 50 37 18 10 3/32-5/32 2,800 106 18 37 10 228
311 STVC 47,700 75 55 27 15 3/32-5/32 2,800 147 25 54 15 342
114H STVC 35,800 56 40 20 9 1/16-1/8 2,200 165 55 38 14 168
214H STVC 71,600 113 80 40 18 3/32-5/32 2,200 220 75 58 24 336
314H STVC 107,400 170 120 60 27 3/32-5/32 2,200 275 85 78 34 504
116 STVC 40,400 64 45 22 11 1/16-1/8 2,200 189 62 41 23 228
216 STVC 80,800 134 90 44 22 3/32-5/32 2,200 272 87 90 47 456
118 STVC 64,500 102 75 35 21 1/16-1/8 2,000 266 95 47 33 264
218 STVC 129,000 204 150 70 42 3/32-5/32 2,000 390 150 65 63 528
118H STVC 75,000 119 85 40 21 1/16-1/8 1,650 290 103 47 33 264
218H STVC 150,000 238 175 80 42 3/32-5/32 1,650 415 160 65 63 528
318H STVC 225,000 357 260 120 63 1/8-3/16 1,650 540 215 83 153 792
221STVC 175,300 278 195 97 49 3/32-5/32 1,650 500 256 127 114 724
321 STVC 263,000 417 300 150 84 1/8-3/16 1,650 735 360 210 185 1,086
124H STVC 153,700 243 180 90 40 3/32-5/32 1,400 580 390 90 100 574
224H STVC 307,400 487 360 180 80 1/8-3/16 1,400 790 535 180 200 1,148
324H STVC 461,100 731 540 270 120 5/32-7/32 1,400 1000 680 270 300 1,722
227 STVC 345,000 548 383 192 96 1/8-3/16 1,400 890 700 200 275 1,460
327 STVC 517,500 821 600 300 165 5/32-7/32 1,400 1,200 945 265 350 2,190
230H STVC 654,000 1,038 760 380 200 1/8-3/16 1,100 1,375 1,350 265 460 1,664
330H STVC 981,000 1,557 1,150 570 300 3/16-1/4 1,100 2,500 2,325 380 570 2,496
336 STVC 1,524,000 2,418 1,800 885 495 3/16-1/4 900 2,700 3,770 540 1,260 3,450
342 STVC 2,179,000 3,458 2,550 1,275 705 3/16-1/4 800 3,600 7,700 1,100 3,375 4,212
248 STVC 2,805,000 4,452 3,200 1,600 915 1/8-3/16 700 4,500 11,200 785 3,130 4,020
348 STVC 4,207,500 6,678 4,800 2,400 1,370 3/16-1/4 700 5,590 13,850 1,140 4,360 6,030
260 STVC 5,950,000 9,440 6,950 3,470 1,940 3/16-5/16 550 7,525 24,700 1,665 9,400 7,240
360 STVC 8,925,000 14,160 10,400 5,200 2,900 1/4-3/8 550 9,350 32,250 2,500 14,020 10,850
460 STVC 11,900,000 18,880 13,900 6,940 3,880 5/16-7/16 550 12,000 41,000 2,900 16,615 14,480
560 STVC 14,875,000 23,611 16,528 8,264 4,132 1/2-9/16 550 11,750 — — — 18,100
372 STVC 13,965,000 22,167 15,517 7,758 3,879 5/16-7/16 400 — — — — 14,460

Note: Maximum air pressure – 100 PSI

Max. Horsepower

Per 100 RPM

Duty

Driving Ring

& Friction

Disc

2

2

in.

126 Wichita Clutch 800-964-3262

P-1100-WC 1/12