Nexen's TL Series pneumatically engaged, single-position torque limiters deliver overload protection for machinery

Nexen introduces the TL Series pneumatically engaged, single-position torque limiter, which delivers overload protection for industrial machinery. The TL Series uses a ball/detent interface and proximity sensor to immediately disengage the machine shaft when excessive torque or a machine jam occurs, protecting downstream equipment and product from damage and decreasing downtime. Upon detecting the overload condition, the sensor sends a signal to the torque limiter’s control valve, exhausting the air and disengaging the unit for a clean disconnect of power to the driven components.

By utilizing pneumatic actuation, TL Series units facilitate remote trip-out torque adjustment via an air regulator, allowing operators to optimize overload protection while the machine is in use — thus eliminating the need for inconvenient onsite adjustments. Each torque limiter’s interface has five ball/detents arranged in an asymmetrical pattern, assuring each engagement occurs in the same position and affirming machine components are accurately synchronized. The hard-chromed detent interface decreases drive-ring wear when the balls are pressed against the face during jog-to-position engagement, extending operational life as well as ensuring complete disengagement every time — without premature reengagement.

Semi-open and totally enclosed nickel-plated TL Series units are available. Semi-open units are sealed to keep contaminants out of the ball/detent area, while enclosed units are designed to protect the ball/detent and spline areas in washdown or other manufacturing environments where liquids are present. A variety of ball/detent sizes are available to provide a range of torque capacities.

Additional features of the TL Series include:

  • The air chamber is sealed with O-rings to eliminate air leakage and minimize repairs, with backup rings to prevent O-ring dislocation, decreasing wear and extending the component’s operational life.
  • Internal springs separate the ball and detent interfaces, preventing the ball from being forcefully removed from the detent — extending life and eliminating detent distortion, as well as preventing the torque limiter from reengaging until the machine stops.
  • The proximity sensor features an LED that illuminates to indicate when the torque limiter is engaged.
  • Single- or double-flex couplings are available to deliver high shaft misalignment protection with zero backlash and improved torsional rigidity.
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