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PSF/PSKF series
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The low backlash PSF/PSKF planetary servo gear units from SEW-EURODRIVE in single-stage and two-stage versions are, thanks
to their structural design, very compact and allow for high torque and overhung loads. They are available in eight sizes with
high torsional rigidity and cover a torque range of 25 ... 3000 Nm (220 ... 26550 in-lb). They can be accelerated with torques
of up to 4200 Nm (37170 in-lb).
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Technical data
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Size
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Mrated [Nm] ([in-lb])
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Gear ratios
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Circumferential backlash [’]
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121
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25 (220)
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Single-stage
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3 / 4 / 5 / 7 / 10
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8 / 4 / 2
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221 / 321 / 521
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55 / 110 / 300 (490 / 974 / 2660)
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6 / 3 / 1
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621 / 721 / 821 / 921
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600 / 1000 / 1750 / 3000 (5310 / 8851 / 15490 / 26550)
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4 / 5 / 7 / 10
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4 / 2 / 1
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122
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25 (220)
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Two-stage
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16 / 20 / 25 / 28 / 35 /
40 / 49 / 70 / 100
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10 / 6 / 3
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222 / 322 / 522
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55 / 110 / 300 (490 / 974 / 2660)
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8 / 4 / 2
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622 / 722 / 822 / 922
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600 / 1000 / 1750 / 3000 (5310 / 8851 / 15490 / 26550)
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6 / 3 / 1
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PSBF series
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The low-backlash PSBF planetary servo gear units feature extremely high torsional and pull-out rigidity. Five sizes cover
a rated torque range of 55 ... 1750 Nm (490 ... 15490 in-lb) and can be driven with acceleration torques of up to 2500 Nm
(22130 in-lb). The interlocking connections throughout ensure high safety factors and do not allow for positioning deviation
through molecular movement, as is the case with a hollow shaft mounting system. The compact design of the flange block version
saves installation space and costs since there is no need for additional clamping rings and coupling elements.
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Technical data
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Size
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Mrated [Nm] ([in-lb])
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Gear ratios
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Circumferential backlash [’]
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221 / 321 / 521
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55 / 110 / 300 (490 / 974 / 2660)
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Single-stage
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5 / 7 / 10
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6 / 3 / 1
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621 / 821
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600 / 1750 (5310 / 15490)
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222
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55 (490)
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Two-stage
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20 / 25 / 35 / 49 / 70 / 100
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8 / 4 / 2
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322 / 522
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110 / 300 (974 / 2660)
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15 / 20 / 25 / 35 / 49 / 70 / 100
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622 / 822
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600 / 1750 (5310 / 15490)
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20 / 25 / 35 / 49 / 70 / 100
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6 / 3 / 1
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BSF series
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Right-angle drives are often used when there is a limited amount of space that does not allow for drives to be installed lengthwise.
The new low-backlash BSF helical-bevel servo gear units enable servo applications to be driven "around the corner". The following
versions are available:
BSF series two-stage helical-bevel servo gear units have high-endurance helical-bevel gear components that are not subject
to wear.
The bevel gear output stage and helical gearing of the input gear stage are quiet and have low backlash. Helical-bevel servo
gear units are available with a 40 ... 1500 Nm ( 346 ... 12977 in-lb) torque range, with <6 or <3 angular minute circumferential
backlash and acceleration torque up to 1910 Nm (16523 in-lb).
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Technical data
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Size
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Mrated [Nm] ([in-lb])
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Gear ratios
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Circumferential backlash [’]
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202
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40 (350)
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Two-stage
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3 / 4 / 6 / 8 / 10 / 15 / 20 / 25
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6 / 3
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302 / 402
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80 / 160 (710 / 1420)
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3 / 4 / 6 / 8 / 10 / 15 / 20 / 25 / 30
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502
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320 (2830)
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3 / 4 / 6 / 8 / 10 / 15 / 20 / 25 / 30 / 35
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602 / 802
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640 / 1500 (5660 / 13280)
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3 / 4 / 6 / 8 / 10 / 15 / 20 / 25 / 30 / 35 / 40
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