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The Positorq® Absorber Brakes and Clutches use the same basic design of a multiple disc stack furnished with a continuous supply of cooling and lubricating fluid as do the other Force Control products. A major difference between the Positorq® and the Posistop brake is that the Positorq® is designed as a constant slip device and is normally force lubed for smooth torque control and energy absorption.

Tension brakes and dynamometers are essentially energy absorbers. Rotary motion is transformed through the brake to heat. Therefore, a critical function of the brake is to be able to dissipate this heat during slip. In the Positorq®, fluid is pumped through the shaft to furnish a continuous supply of fluid to the friction surfaces. The fluid, both lubricates the surfaces at the point of contact and removes the heat. The heated fluid is then circulated through a cooling unit (either oil to water or oil to air) dissipating the heat and returned to the Positorq®.

Since the effective radius, number of discs and friction factor remains constant, the torque available is directly equivalent to the (air or hydraulic) actuation pressure furnished to the actuating piston.
Since the effective radius, number of discs and friction factor remains constant, the torque available is directly equivalent to the (air or hydraulic) actuation pressure furnished to the actuating piston.
Unit of Measure

Positorq™ Features and Benefits

Smooth Consistent Control

 N/A State-of-the Art friction materials and fluids have been developed for very smooth and consistent operation. Jerks, steps, chatter, etc. have virtually been eliminated.
Controlled fluid temperature through the brake improves consistency for precision testing.

Stable Torque Control

 N/A Smooth, consistent actuation with low piston hysteresis is experienced by using Teflon Liners over the O-Rings to seal the non-rotating piston. This eliminates stick slip often associated with O-Ring seals.
Torque is controlled by actuation pressure and is independent of speeds above the residual (minimum) drag torque.

Low Speed Capability

 N/A Operational speeds at levels down to 0 RPM are precisely controlled without chatter, stick slip or torque variation.
Speed-up drives which can influence test results are eliminated.

High Torque and Horsepower Capability

 N/A Various sizes available from 53 Ft. Lbs. up to 27,656 Ft. Lbs. Continuous heat absorption capability up to 1500 thermal horsepower.

Quiet Operation

 N/A Extremely quiet operation with noise levels of the brake system below 65 db. This is beneficial for laboratory operation or noise testing.

Quick Response for Computer Control

 N/A Quick, precise piston actuation produces excellent response to manually or computer generated signals. Hydraulic actuation can also be furnished for even quicker actuation.
Low rotating mass inertia for increased responsiveness to changes in torque requirements.

No Adjustment Required

 N/A Adjustment is not required, making it very useful for long continuous life tests of many months duration without shutting down for brake adjustments or repairs.

Long Service Life

 N/A Oil shear technology nearly eliminates the frictional wear of the disc stack. Therefore long life and low maintenance costs are experienced. Inexpensive repair kits are available from stock.
An external wear indicator indicates the need for impending stack replacement long before actual failure would occur.

Low Air Pressure Required

 N/A Maximum required air pressure is below 60 PSI reducing problems associated with low plant air pressure.

Totally Enclosed Design

 N/A The totally enclosed design eliminates any contamination to the lab or test area with friction materials or other harmful contaminates.

Specifications

Maximum Continuous Slip @ PSIG Dynamic Brake Torque

 N/A 260 @ 30 lb·ft

Maximum Momentary Slip @ PSIG Dynamic Brake Torque

 N/A 391 @ 43 lb·ft

Maximum Static Torque @ PSIG

 N/A 521 @ 60 lb·ft

Maximum Speed

 N/A 3600 rpm

Basic Thermal

 N/A 1.00

Force Lube Thermal

 N/A 125.0

Piston Volume

 N/A 16.0 in³

Cyclic Inertia

 N/A 0.16 lb·ft²

Foot Mounting Dimensions A

 N/A 10.25 in

Foot Mounting Dimensions D

 N/A 6.5 in

Foot Mounting Dimensions E

 N/A 3.50 in

Foot Mounting Dimensions 2Fs

 N/A 9.09 in

Foot Mounting Dimensions 2Ft

 N/A 12.02 in

Foot Mounting Dimensions G

 N/A 0.75 in

Foot Mounting Dimensions H

 N/A 0.56 in

Foot Mounting Dimensions O

 N/A 12.38 in

Foot Mounting Dimensions BSV

 N/A 5.75 in

Overall Length C1s

 N/A 16.50 in

Overall Length C1t

 N/A 19.42 in

Shaft Dimensions a/Fa

 N/A 3/8 x 3/16 in

Shaft Dimensions U/FU

 N/A 1-5/8 in

Shaft Dimensions V/FV

 N/A 4.00 in

Bottom Porting-AA

 N/A NPT 1/4 in

Top Porting-AA

 N/A NPT 1/4 in

Note

Note

 N/A Less than 60 seconds, less than 60% duty.
Top porting is standard, bottom porting is optional. The use of bottom porting is recommended to purge contaminants out of the cylinders when they are exhausted. Top porting will not purge the cylinders.
In the dimensional table “s” denotes a single brake stack unit and “t” denotes a tandem brake stack unit.
Keyed shaft not available on Size 20 Tandem stack units.