CAMCORP SWF with Externally Mounted Fan - Manual (Page 37)

Martin
TORQUE-LIMITER
clutch offers thrifty overload protection
that’s easy to adjust.
Here is low cost protection for your machinery . . . a torque
limiting clutch that is easy to install.
Torque-Limiter clutches feature an exclusive “Easy-Set
Adjustment.” With “Easy-Set,” torque adjustment is accom-
plished quickly! The need for hammer and block, brute
strength and spanner wrenches is eliminated.
These simple steps and the job is done:
1. Snug up the adjusting nut, finger tight, locate set screw
over nearest spline notch and tighten. See table at right.
2. Tighten three cap screws until heads bottom — with a
small wrench; this gives maximum torque.
3. For less torque — back off the cap screws, loosen the set
screw, back off adjusting nut to one of the six spline
notches as required, and retighten set screw and cap
screws.
“Easy-Set Adjustment” not only simplifies installation, it pro-
vides solid support for pressure plates by compression at
their peripheries.
The Torque-Limiter clutch gives machinery permanent protec-
tion against overloads during starting, reversing or driving —
by slipping at any desired load. It resumes driving without
resetting when the overload is relieved. It is simple in
design, compact, efficient and built for long life. It provides
low cost torque limiting service for a wide variety of applica-
tions. No lubrication . . . minimum maintenance.
Starting shock from electric motors is a major cause of
maintenance of moving parts. Torque-Limiter clutches pro-
vide a cushion by slipping until the torque drops to a pre-set
level. They can be set to reduce shock loads on motors and
driven equipment during reversing or inching. They provide
mechanical protection against breakage due to sudden
overload — by slipping when the pre-set torque limit is
reached.
2
Torque-Limiter
Clutches
Torque-Limiter clutches may be used with a sprocket, gear,
sheave, flange or other driven member. It is recommended
that the rubbing sides of the driven member be ground to
provide a smooth rubbing surface of 65 to 125 micro-inches.
See torque rating table on following page.
The driven member is mounted on an oil-impregnated bush-
ing and clamped between two, high quality friction discs by
spring pressure. Each Torque-Limiter unit, completely
assembled, contains one spring. Higher torque ratings can
be obtained by the use of a second spring nested within the
original spring. See rating table on following page.
When an overload occurs, the driven member slips between
long-life, clutch-type friction discs. After slipping has started,
it will continue at approximately 90% of the torque setting,
due to the lower coefficient of friction when slipping, until the
overload condition has been corrected.
T
ORQUE
(lb.-ins.)
70-2
70-1
50-2
50-1
35-2
35-1
25-2
25-1
0 1 2 3 4 5 6 7
SPLINES
Note:
Graph indicates approximate rated torque vs number of
splines adjusting nut is backed off from finger tight.
TORQUE-LIMITER CLUTCH CALIBRATION
#25 300 700 400 1200
#35 600 1700 900 2500
#50 950 2650 2350 5700
#70 2000 8000 3100 11500
Torque Rating
One Spring Two Springs
Size Min. Max. Min. Max.
12000
11000
10000
9000
8000
7000
6000
5000
4000
3000
2000
1000
0