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Mechanical Torque Limiter Brakes

tl1-torque-limiter

Carlyle Johnson's mechanical torque limiter brakes provide protection against overloads while sustaining torque, so that shutdown and restart is not required. Acting like a torsion shock absorber to permit "slip" if the torque exceeds an adjustable pre-set level, these torque limiter brake units are used in any application where obstructions can cause overloads, or where production is sensitive to over-tensioning.

The TL1, TL2 and TL3 model multiple disc mechanical torque limiter brakes are often utilized in applications such as machine tools, conveyor systems, off-highway mobile equipment, in textile or paper mills.

CJM engineers can design and produce a custom mechanical torque limiter brake to meet your exact needs, and we can alter our standard products to achieve your requirements. Our engineering department is ready for your toughest power transmission challenge.

Specifications / Dimensions

TL1 Torque Limiter Clutch / Brake Chart A
Model Torque Adj. Range (lb. ft.) Std. Bores (+.001) Std. Bores (-.001) Keyway A B C Q
TL1-0020 0-10 1/2 5/8 1/8 x 1/16 1.250 2.188 1.438 0.188
TL1-0021 10-25 3/4 7/8 3/16 x 3/32 1.625 2.188 1.250 0.125
TL1-0022 25-50 1 1 1/8 3/16 x 3/32 2.125 2.625 1.594 0.125
TL1-0023 50-100 1 1/4 1 3/8 1/4 x 1/8 2.125 3.500 1.063 0.188
TL1-0024 100-175 1 1/2 1 5/8 5/16 x 5/32 2.125 4.000 2.344 0.188
TL1-0025 175-300 1 3/4 1 7/8 3/8 x 3/16 2.750 4.500 2.688 0.188
TL1-0026 300-500 2 2 1/4 7/16 x 7/32 3.250 5.500 3.250 0.188
TL1-0027 500-1000 2 1/2 2 3/4 9/16 x 9/32 4.000 7.000 5.125 0.063
TL1-0028 1000-1500 2 3/4 3 9/16 x 9/32 4.625 8.000 5.500 0.000
TL1 Torque Limiter Clutch / Brake Chart B
Model Driving Lugs
GM		 Driving Lug Width
GM		 SM VM Cup I.D. Cup O.D. Cup Screws Bolt Circle
TL1-0020 3 .615 1.984 2.188 2.017 - 2.015 3.125 - 3.123 3 1/4 x 2 9/16
TL1-0021 3 .615 1.984 2.188 2.017 - 2.015 3.125 - 2.123 3 1/4 x 2 9/16
TL1-0022 3 .740 2.484 2.750 2.517 - 2.515 3.625 - 3.623 3 1/4 x 3 1/16
TL1-0023 3 .990 3.234 3.563 3.627 - 3.625 4.625 - 4.623 3 5/16 x 4 7/16
TL1-0024 3 .990 3.734 4.063 3.767 - 3.765 5.125 - 5.123 3 5/16 x 4 7/16
TL1-0025 8 .740 4.484 4.875 4.517 - 4.515 6.125 - 6.123 4 3/8 x 5/16
TL1-0026 12 .615 5.484 5.875 5.517 - 5.515 7.125 - 7.120 6 3/8 x 6 1/4
TL1-0027 12 .740 6.984 7.500 7.017 - 7.015 9.125 - 9.120 6 1/2 x 8 1/16
TL1-0028 12 .740 7.984 8.500 8.017 - 8.015 10.125 - 10.120 6 1/2 x 9 1/16
TL2 Torque Limiter Clutch / Brake Chart A  
Model Torque Adj. Range (lb. ft.) Bores (+.001) Bores (-.001) Keyway A B Hub Bore Min.
C		 Hub Bore Max.
C		 L1 L2
TL2-0020 0-10 1/2 5/8 1/8 x 1/16 2.125 2.188 .375 .750 1.625 .438
TL2-0021 10-25 3/4 7/8 3/16 x 3/32 2.625 2.188 .500 1.000 11.313 .563
TL2-0022 25-50 1 1 1/8 3/16 x 1/16 3.375 2.781 .625 1.250 2.688 .563
TL2-0023 50-100 1 1/4 1 3/8 1/4 x 1/8 3.500 3.563 .875 1.500 2.688 .688
TL2-0024 100-175 1 1/2 1 5/8 5/16 x 5/32 3.750 4.063 1.000 1.750 2.813 .813
TL2-0025 175-300 1 3/4 1 7/8 3/8 x 3/16 4.625 4.875 1.250 2.000 3.563 .938
TL2-0026 300-500 2 2 1/4 7/16 x 7/32 5.625 5.875 1.750 2.500 4.188 1.375
TL2-0027 500-1000 2 1/2 2 3/4 9/16 x 9/32 7.500 7.500 2.000 3.250 5.375 2.000
TL2-0028 1000-1500 2 3/4 3 9/16 x 9/32 8.500 8.500 2.000 3.500 6.125 2.250
TL3 Torque Limiter Clutch / Brake Chart A
Model Torque Adj. Range (lb. ft.) Std. Bores (+.001) Std. Bores (-.001) Keyway Bores A B C Screws
TL3-0020 0-10 1/2 5/8 1/8 x 1/16 2.438 3.125 1.000 3
TL3-0021 10-25 3/4 7/8 3/16 x 3/32 3.000 3.125 1.250 3
TL3-0022 25-50 1 1 1/8 3/16 x 3/32 4.000 3.625 1.625 3
TL3-0023 50-100 1 1/4 1 3/8 1/4 x 1/8 4.000 4.625 1.750 3
TL3-0024 100-175 1 1/2 1 5/8 5/16 x 5/32 4.125 5.250 2.000 3
TL3-0025 175-300 1 3/4 1 7/8 3/8 x 3/16 4.625 6.500 2.313 4
TL3-0026 300-500 2 2 1/4 7/16 x 7/32 5.750 7.125 2.813 6
TL3-0027 500-1000 2 1/2 2 3/4 9/16 x 9/32 7.125 9.125 4.000 6
TL3-0028 1000-1500 2 3/4 3 9/16 x 9/32 7.500 10.125 4.500 6
TL3 Torque Limiter Clutch / Brake Chart B
Model Screw Size B.C.
D		 Max.
Q		 Sprocket Min. Pitch Dia. Cup Locating Dia. I.D.
J		 Dim. Cup-Body Shoulder
S
TL3-0020 1/4 2 9/16 .750 4.000 2.017 - 2.015 0.094
TL3-0021 1/4 2 9/16 1.000 4.250 2.017 - 2.015 0.063
TL3-0022 1/4 2 1/16 1.250 4.750 2.517 - 2.515 0.063
TL3-0023 1/4 3 5/16 1.250 5.625 3.267 - 3.265 0.063
TL3-0024 1/4 4 7/16 1.250 6.250 3.767 - 3.765 0.063
TL3-0025 3/8 5 1/2 1.250 7.500 4.517 - 4.515 0.063
TL3-0026 3/8 6 1/4 1.750 8.500 5.517 - 5.515 0.125
TL3-0027 1/2 8 1/16 2.000 10.000 7.017 - 7.015 0.063
TL3-0028 1/2 9 1/16 2.000 11.250 8.015 - 8.015 0.063

In addition to our standard Multiple Disc Mechanical Torque Limiters (TL1, TL2 & TL3), our engineering department can custom design and manufacture a new component to meet your specific requirements. If you have further questions or would like to discuss your specific needs, please contact us.

Images & Drawings

tl1-torque-limiter-dimensions

Features of Multiple Disc Mechanical Torque Limiter Brake Units

Depending on size, CJM mechanical torque limiter brakes are adjustable over a wide torque range from 1lb.ft. to 2000 lb. ft. Small space-saver sizes - from 2-3/16" to 8-5/8" O.D. - and high torque potential make these torque limiters the the best possible choice for applications where obstructions can cause temporary overloads or where over-tensioning is a problem.

Unlike our overload release clutches, which automatically cut the torque from full to zero, our Torque Limiter Brakes act as a torsion shock absorber to permit "slip" if torque exceeds an adjustable pre-set level. CJM multiple disc mechanical torque limiter brakes are available in multiple models.

  • TL1 / Type 1
    A highly versatile torque limiting device, the TL1 torque limiter brake unit is compatible with our standard internal flange type driving cup. (Drive cup is sold separately.)

  • TL2 / Type 2
    A cut-off coupling designed to join two shafts, the TL2 torque limiter brake unit transits torque from one shaft to the other.

  • TL3 / Type 3
    A sprocket drive, the TL3 torque limiter brake unit typically mounts on motor shaft as an integral part of the drive mechanism.

Advantages

  • Sustains torque level
  • Durable
  • High torque in a small size
  • Predictable dynamic and static torque
  • Easily adjustable over a wide range
  • Superior adjustment retention
  • Designed for easy rebuilt with no special tools required
  • Steel-on-bronze friction discs provide longer life than fiber discs

Operation

  • Torque range 1 lb. ft.- 2000 lb. ft.
  • Can be pre-set to transmit torque constantly regardless of the speed of the drive mechanism
  • Adjusting nut on end of hub regulates spring pressure against multiple steel-on-bronze friction disc assembly

Customization

  • Multiple sizes from 2-3/16" to 8 5/8" O.D.
  • Internal Flange Drive Cup sold separately
  • Custom designs and alterations available

APPLICATIONS

  • Machine tools
  • Conveyor systems
  • Off-highway mobile equipment
  • In textile or paper mills

Downloads

product-paper-tech-paper-ringfeder-locking-assemblies-en-11-2022

TL1, TL2 & TL3 Torque Limiter Specification Sheet
installation-and-operations-manual-ringfeder-locking-assemblies-rfn-7006-en-08-2019

Upload a CAD for a custom torque limiter design.

Further downloads including certificates, instruction manuals and product images are available to you in our Download Center:

Downloads