FSS20 Cup-Type Harmonic Reducer

MANUFACTURER DOCUMENTATION

Overview

FSS20 strain-wave reducer from the Laifual standard cup-type range. Rated torque is specified at 2,000 rpm input. Start-stop, average-load and momentary torque limits are separate values and must not replace the rated torque.

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Published series specifications

Series ranges describe the product family. They are not interchangeable operating points.

Frame

20

Ratios

50 / 80 / 100 / 120 / 160

Rated torque at 2,000 rpm

25 / 34 / 40 / 40 / 40 Nm, respectively

Maximum backlash

20 arcsec (0.333 arcmin)

Maximum input speed

6,500 rpm, grease lubrication

Allowable average input speed

3,500 rpm, grease lubrication

FSS-I / II mass

0.96 kg

Start-stop torque

56 / 74 / 82 / 87 / 92 Nm, respectively

Momentary maximum torque

98 / 127 / 147 / 147 / 147 Nm, respectively

Model configuration table

5 source-backed configurations. Torque is in Nm, input speed in rpm and backlash in arcmin. The note preserves the rating conditions and precision grade.

Selection checks for FSS20 Cup-Type Harmonic Reducer

Use these questions with the manufacturer’s current model sheet and your actual operating conditions.

• Compare 50, 80, 100, 120 or 160 ratio against its own rated torque at 2,000 rpm input; the five values are not interchangeable.
• Keep rated, start-stop and momentary torque separate. For the selected ratio, also check average input speed and the grease-lubricated maximum.

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A compact hollow strain-wave series for precision motion. The manufacturer publishes separate continuous, start/stop and momentary torque ratings; these limits should not be interchanged.

Frame sizes

14 / 17 / 20 / 25

Ratios

50 / 100

Rated torque

3.5–47 Nm at 2,000 rpm input

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Standard LCS14 strain-wave gear with cup-shaped flexspline. LCS and the higher-torque LCSG variant have different ratings; the values here refer only to LCS14.

Frame

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Ratios

30 / 50 / 80 / 100

Rated torque

4 / 5.4 / 7.8 / 7.8 Nm, respectively

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