When to Use a Tooth-belt Drive Actuator?

When to Use a Tooth-belt Drive Actuator

With belt driven linear actuators versus re-circulating ball bearing systems, the fact is both have a place in an automation design. Belt-drive systems suit shuttle transport and conveyance applications well, especially if you are trying to achieve high speeds over long stroke lengths. They often fare better than lead screws for high speed/long stroke applications, especially in vertical applications where lead screw-driven systems may be prone to noise and resonance.

The belts are designed to maintain the proper tension over the actuators lifetime (providing they are used within the guidelines of the published specifications), so there is no need to be concerned about belt elongation. Industries using belt-driven systems include laboratory automation, packaging machinery, gaming and amusement equipment, screen-printing, test fixtures, and many other applications where quiet operation and dry-running systems are critical.

Belt-drive linear actuators easily handle high duty cycles as there is no concern about frictional heat buildup in the nut.

MJUNIT® tooth-belt driven linear actuators were designed as low-cost, shorter lead time alternatives to traditional re-circulating ball bearing systems which sometimes cost thousands of dollars. They are engineered with wear-resistant, dry-running, oil-free linear bearings which do not require maintenance.

These systems suit applications requiring quick positioning of small to medium loads at high speeds (up to 1 m/s), at stroke lengths up to 3850 mm.  

The linear positioning tolerance of belt-driven systems is generally greater than that of lead screw driven systems. Some belt drive systems that operate on linear plain-bearing technology do not differ that much from higher cost systems relying on re-circulating ball bearing technology.

Here is a quick checklist to see if MJUNIT® systems will suit your application:
45 mm x 45 mm (1.77 in x 1.77 in) body profile
Belt drive
Choose MJUNIT belt drive for longer strokes than screw drive actuators, Stroke lengths up to 3.75m (12.3 ft)
Carriage load up to 147 N (15kg, 33 lbf)
Maximum moments up to 5 Nm (44.3 lb•in)
High speed and acceleration capabilities, speeds up to 1 m/s (39.4 in/s)
Linear Accuracy: ± 0.05 mm (± 0.002 in)
Excellent repeatability, high duty cycle performance, Positional Repeatability: ± 0.1 mm (± 0.004 in)
Polyurethane belt with steel members resists stretching
Belt-drive systems suit applications with high duty cycles as there is no concern about frictional heat buildup in the nut.
For low-weight vertical actuator applications.
For applications in sensitive environments such as laboratory or food processing equipment.

Belt-driven linear actuators systems can deliver quick positioning of loads.

The MJUNIT systems are based on hard-anodized aluminum guide rail profiles, which offer a good mating surface for the linear bearing liners. Linear bearing housings are available including low-cost, lightweight and corrosion-resistant hard-anodized aluminum machined parts, as well as adjustable versions which allow the flexibility to eliminate or increase the linear bearing clearance per the application requirements.


Contact: March Yu
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