Wichita Clutch Fluid Coupling User Manual
Mesur-Fil Fluid Couplings
15 HSD
12.4 HCM
9.4 HBM
154 Wichita Clutch 800-964-3262
7.0 HSD
P-1100-WC 1/12
Wichita Mesur-Fil®Fluid Cou plings
deliver reliable smooth power
trans mis sion. To consistently deliver,
we select only from the highest quality
materials. Our man u fac tur ing and product
assembly are completed under the most
exacting guidelines and established
procedures. The result is unquestioned
consistent product dependability.
Mesur-Fil Fluid Couplings are rated for
motors up to 2,500 HP. They have earned a
reputation for providing smooth, soft starts
while reducing current draw on the motor by
33%.
Mesur-Fil Fluid Couplings
Mesur-Fil Fluid Couplings are
ideally suited for direct drive
applications between electric
motors and gear boxes.
Typical Applications
Bulk Material Handling Equipment
and Mining Related Industries:
Conveyors of all types
Crushers
Excavators
Fans
Mills
Mixers
Pumps
Screening Plants
Petrochem and
Chemical Processing:
Agitators
Blowers/Fans
Centrifuges
Compressors
Mixers
Pumps
Other Applications include:
Amusement park rides
Construction
Machine tools
Oil Field
Power Generation
Ski resort chair lifts
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Mesur-Fil 7.0 HSD allows
shock-free acceleration on
large inertia loads.
Picture Courtesy of Torpey
Denver, Inc.
P-1100-WC 1/12
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Mesur-Fil 7.0 HSD on
amusement park ride,
“Speed Boats,” giving
cushioned, smooth starts.
Picture Courtesy of Torpey
Denver, Inc.
Wichita Clutch 800-964-3262 155
Mesur-Fil Fluid Couplings
Design Avantages
Mesur-Fil Fluid Couplings allow motors to start
unloaded and to reach operating speed with smooth,
controlled accel eration. This makes it ideal for
ap pli ca tions with high inertia loads. They are
available in either constant or delay fill versions.
Runner
All Aluminum
Housing for
Low Rotating
Inertia
Impeller
High Temperature
Viton Seals
Collet
Mounted
For Ease
of Mount ing
Smaller Sizes
Ben e fits
Mesur-Fil Fluid Couplings offer several
advantages:
• Reduced energy consumption
• Jam/overload protection
• Shock load cushioning
• No metal-to-metal contact
• Wide range of available mount
options
• High
temperature Viton seals
• Available from over 700 Formsprag
Authorized Distributors.
ing
INPUT
Motor
Runner Fluid
There are three primary com po nents
to Mesur-Fil Fluid Cou plings:
1. Vaned runner
2. Vaned impeller
3. Fluid fill
Torque, produced by the prime mover
(motor) acting on a vaned runner, is
transmitted through the flow of fluid into
One Piece Construction
(smaller sizes)
Eliminates Leaks.
Prin ci ple of Operation
OUTPUT
Load
Impeller
the chambers formed by the two coupling
halves. The oil (fluid) is sub se quent ly
thrown into the vaned impeller connected
to the load causing it to turn. It is
important to note, that as this trans mis sion
of power takes place, there is virtually no
wear on the transmitting parts be cause
there is no mechanical contact between
them.
156 Wichita Clutch 800-964-3262
P-1100-WC 1/12
Fluid Requirements
Figure 2 reveals a typical NEMA B electric
motor torque curve together with the
particular op er at ing characteristics of a
specific coupling with a designated fill
level. With no power supplied, all of the
fluid is settled at the bottom of the
coupling. Slip rate in this condition is
100% with the input free to turn. With the
motor starting and increasing in speed to
the breakdown point, torque builds in the
coupling. As torque in creas es, the
coupling begins to deliver the load to the
motor, eventually bringing the load up to
speed (refer to the load ac cel er a tion area
in Figure 2).
Figure 2 - Starting Torque
Figure 3 - Start-up Burnout Protection
Mesur-Fil Fluid Couplings
Figure 1 - Motor Breakdown Points
The area on the chart between
the motor torque curve and the
100% slip curve represents the
excess torque available to the
motor to start itself without also
having to start the load. It is this
op er at ing char ac ter is tic which
permits a soft start with a onethird lower current draw on the
motor (see Figure 3). (It should
be noted that because the
coupling torque can only be de vel oped if the runner is turning at
a slower speed than the impeller,
an ideal small amount of slip of
3% to 5% is nec es sary).
The Mesur-Fil Fluid Coupling
provides for jam load pro tec tion
to the motor and other vital
power system components. It is
designed to allow the motor to
decelerate only to its breakdown
point (see Figure 4). The results
without the fluid coupling could
be a locked rotor con di tion,
resulting in excessive current
draw and potential motor
damage. Ad di tion al ly, the
coupling dis trib utes the shock
of an overload over a longer
time span, thus reducing the
pos si bil i ty of damage.
Delayed Fill
Mesur-Fil Fluid Couplings, sizes 15 through 34
(30 to 1500 HP), have an available delayed fill
option restricting starting torque to 140% of
full load while still ensuring low slip at full
speed. The result is a softer, more gradual
start which can be advantageous for
ap pli ca tions such as belt conveyors and
mixers.
The operating principles are simple. With the
idle coupling (see Figure 5) the purpose of the
delayed fill chamber is to isolate a portion of
the fluid from the main cou pling. As the runner
ac cel er ates (see Figure 6), the chamber
attached to the runner gradually releases fluid
into the main coupling through specially
calibrated orifices. The fill increases
proportionally with the output speed. With ac cel er a tion complete (see Figure 7) at the high
speed running position, almost all of the fluid
has been released from the
chamber into the cou pling,
giv ing the cou pling
high fill/low slip char ac ter is tics.
Figure 5
Standstill
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Figure 4 - Jam Load Burnout Protection
P-1100-WC 1/12
Figure 6
Accelerating
Figure 7
Running
Wichita Clutch 800-964-3262 157
Mesur-Fil Fluid Couplings
Mounting Types per Size
Size
Mounting
7.0* 9.4* 12.4* 15 17 19 21 24 27 29 34
Type
Mounting
Ap pli ca tion
HC
• • •
(page 168)
HCM
• • • • • • • • • • •
(pages 170-171)
HBM
• • •
(page 169)
HSD
• • • • • • • •
(pages 172-173)
* Modular design (See page 167)
Basic coupling for custom input & output
For use with flexible gear couplings
Shaft to shaft applications
For stub shaft input/output sizes 7-12.4
Parallel, QD sheave application
158 Wichita Clutch 800-964-3262
P-1100-WC 1/12
Mesur-Fil Fluid Couplings
HC Sizes 7.0-12.4 Input and Output customer supplied.
(page 168)
This is a basic coupling with an input bore for direct
mounting on the motor shaft end and a convenient bolt
circle for customer-designed output configurations.
HBM Sizes 7–12.4
(page 169)
HCM
(pages 170-171)
The Model HCM Fluid Coupling is a complete unit with both
input and output flanges. It is intended for in stal la tion between
two halves of a double en gage ment gear tooth flexible
coupling which is customer supplied. This ar range ment
provides for a wide range of input and output configurations
for ease of installation.
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This coupling is a complete unit with straight input and
output shaft. It is installed between two piloting type flexible
couplings supplied by the customer.
HSD
(pages 172-173 )
Hydro-sheave couplings are mounted to the motor shaft end
and provide minimal overhung loads for parallel (belt-driven)
shaft applications. The smaller sizes (7-12.4) are installed very
quickly and easily utilizing a slotted collet in which no drilling or
tapping is required. The slotted collet is finished bored to fit
standard NEMA B motor shaft dimensions. The larger sizes
(15-24) are installed with a center locating bolt that does
require drilling and tapping to ensure proper mounting.
The Model HSD Fluid Coupling consists of a basic fluid
coupling, input and output group, and a standard customer
supplied QD type sheave. The sheave is mount ed on a coupling
that has been installed on the end of a driveshaft.
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P-1100-WC 1/12
Wichita Clutch 800-964-3262 159
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