ServoBelt™ Linear Drive

Forget everything you thought you knew about belt drives

ServoBelt™ Linear actuators redefine the classic belt drive, putting belts to work in an entirely new way that reduces the positioning errors and speed limitations of conventional belt drives.

  • High Performance, Low Cost. With speeds up to 4 m/s, accuracy to ± 4 µm per meter and bi-directional repeatability of ± 1 encoder count, ServoBelt Linear compares favorably to high-end linear motor drives costing thousands more.
  • Limitless Scalability. With a chassis based on standard Bosch-Rexroth T-slot extrusions, ServoBelt Linear can be engineered for travel distances up to 50 meters to create large-format motion systems.
  • Multiple Carriages and Axes. A single ServoBelt Linear axis will support multiple carriages with independent motion. Multi-axis configurations include Cartesian motion systems and gantry robots.

SBL Light Duty and SBL Medium Duty
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Unlike a conventional single-belt drive, ServoBelt Linear’s carriage rides between a pair of toothed, steel-reinforced polyurethane belts.


  • Dual Belts. The “static” belt is permanently bonded to an aluminum rail to form ServoBelt’s structural chassis, much like a gear rack. The “active” belt runs over a driven pinion and through a set of idler rollers fixed inside ServoBelt’s moving carriage.
  • Constant Stiffness. The two belts are under tension only around the pinion, which minimizes belt stretch and makes driveline stiffness constant along the entire axis.
  • Backlash Free. Tensioning of the belt preloads the belt mesh on either side of the pinion for backlash free movement in either direction.
  • Debris Tolerant. Along the rest of the rail length, the active and static belts remain engaged, protecting the mesh from debris.
Click image to view ServoBelt Linear Technical Specifications

Download Bell-Everman's Linear Motion Engineering Guide

ServoBelt Linear comes in three versions to meet differing payload and linear force requirements.
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Learn how to replace the motor and belt

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ServoBelt Linear

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ServoBelt Linear

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ServoBelt Linear Stages

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