Torque Limiter Catalog
16Pages

ROTARY MOTION CONTROL Technical Data Sheet Nexen Mechanical PMT/PMK/PMC Torque Limiter Family 2CC The trend in industry is to design and incorporate more automation into production processes. Machines are becoming more accurate, requiring a higher degree of precision. They are becoming faster, using servo and DC drive technology, and they are more rigid to withstand the dynamic loads necessary to increase capacity and productivity. Torque overloads caused by material jams, operator error, or a whole host of unforeseen reasons pose a significant threat to machine downtime. Machine downtime in an automated production environment is very costly. Broken components, costly technicians, and long lead times for custom components can make the difference between operating profitably or not. The use of a patented torque limiter will isolate the driving from the driven elements within a matter of milliseconds, once the torque reaches a preset overload value. Features • Precise overload protection • Absolutely backlash-free and torsionally rigid • Compact, simple design • Disengagement detection is achieved through indexing ring movement • Low residual friction following disengagement • Low moment of inertia • Disengagement within milliseconds • Double bearing support of pulley/sprocket

Overview Order using model descriptions only 1 2 3 4 MTLXXX - XXX - XX - XXX-XXX - XX/XXX - XXX - XX - XXX - X P MT (Pilot Mount/ Tapered clamping hubs) lock the torque limiter to the shaft with a series of cap screws that are alternately and evenly tightened. P MK (Pilot Mount/ Keyed bore) do not have set screws to retain the unit on the shaft. Use shaft collars to fix position of the MTL on the shaft. Setscrews are not an option with this design. PMC (Pilot Mount/ Clamp Collar) lock the torque limiter to the shaft with a single clamp collar. 2CC: Coupling with two clamp collars and a...

* Smaller bore sizes may cause lower than posted torque ratings. See Pg 4 ** On PMK units: 400 Nm [3540 in-lb]

Positive Stop • Nexen mechanical torque limiters are factory set to the lowest disengagement torque, which is marked on the coupling. The adjustment range (min/max) is also marked on the adjustment nut (1). • The customer can adjust the disengagement torque as long as it falls into the range (12) indicated on the adjustment nut. • The adjustment range may not be altered during setting. • To adjust the disengagement torque, loosen the locking screws (11) and rotate the adjustment ring using a spanner wrench to the desired new setting. Tighten the three locking screws (11) and test the torque...

For actuation path (see table) Bore for spanner wrench

DIN 6885 or inch keyway optional For actuation path see table Bore hole for wrench H MTL-2CC with clamping hub Materials: Bellows: Stainless Steel Interface: Hardened Steel Hub: Sizes 15-60, Aluminum Size 150 & larger, Steel Temperature Range: -30° C to 120° C [-22° F to 248° F] Bellows Construction: Welding is recommended for situations where the coupling is exposed to temperatures in excess of 100 degrees C or corrosive agents especially those containing chlorine. AF, BF & FF - Full Disengagement Version

For actuation path see table Bore hole for wrench Remove jack screws F / F1 ISO 4017 A / AF MTL-2TC with tapered clamp connection Materials: Bellows: Stainless Steel Interface: Hardened Steel Hub: Sizes 15-60, Aluminum Size 150 & larger, Steel Temperature Range: -30° C to 120° C [-22° F to 248° F] Bellows Construction: Welding is recommended for situations where the coupling is exposed to temperatures in excess of 100 degrees C or corrosive agents especially those containing chlorine. AF, BF & FF - Full Disengagement Version

For actuation path see table H1 Hole for adjusting wrench T . keyway optional MTL-ECC Elastomer insert coupling with clamping hubs Materials: Elastomer Insert: Molded, wear resistant, thermally stable polymer Interface: Hardened Steel Hub: Sizes 15-60, Aluminum Size 150 & larger, Steel Temperature Range: -30° C to 120° C [-22° F to 248° F] Coupling Properties • Vibration Dampening • Electrically Isolating • Backlash Free • Press Fit Design • Compensated for Lateral, Angular and Axial Misalignment Lateral Misalignment Angular Misalignment

MTL-PCC Press-fit version with clamping hubs Materials: Bellows: Stainless Steel Interface: Hardened Steel Hub: Sizes 15-60, Aluminum Size 150 & larger, Steel Temperature Range: -30° C to 120° C [-22° F to 248° F] Six self-centered, tapered drive projection form a conical element that is molded into an aluminum hub. The mating piece is a metal bellow with a female tapered bore. The MTL-PCC is used for applications with limited accessibility. AF, BF & FF - Full Disengagement Version

Notes: H Coupling Engaged H2 Coupling Disengaged To determine the total effective length of the coupling, add dimensions G to H or H2. Coupling adapters are designed to fit a variety of inch-sized bore, zero backlash, torsionally stiff high misalignment couplings.

As a rule, torque limiters are selected according to the required disengagement torque. This rating must be greater than the torque necessary for normal machine operation. The necessary disengagement torque is determined in accordance with the drive specifications. The following calculations have proven themselves as “rule of thumb” solutions. Disengagement Torque TKNZ1.5-TAS(Nm) or Tm > 9550 • • 1.5(Nm) Rated Torque of the Torque Limiter Peak Torque of Motor Rated Torque of the Torque Limiter Drive Power Speed of Drive Start-up Torque Without a Load TKlfZa-JLZ-±--TAS-SA(Nm) A + ■'L SA =...

THE NEXEN ADVANTAGE The trend in industry is to design and incorporate more automation into production processes. Machines are becoming more accurate, requiring a higher degree of precision. Features • Adjustment range engraved on the outer diameter • Actual values marked rather than percentages Machine downtime in an automated production environment is very costly. Broken components, expensive technicians, and long lead times for custom components. • Adjustable without removal from the application • Patented preload for zero backlash • Small, guided actuation ring for fast reaction The use...