Features

Principle and Structure

TH Geared
(Parallel Shaft)

Taper Hobbed Gear (TH)

A wide variety of low gear ratios, high-speed operation

Backlash: 10 ~ 60 arc minute (0.167º ~ 1º)

Gear ratios: 3.6:1, 7.2:1, 10:1, 20:1, 30:1

Frame sizes: 1.10 in., 1.65 in., 2.36 in. and 3.54 in.

Available for: AR Series (AC Input), AR Series (DC Input), AS Series, ASC Series, RK Series, CRK Series with Built-in Controller and CRK Series

TH Geared

With the TH geared type, tapered gears are used for the spur gear's speed-reduction mechanism and the meshing gear. The tapered gear is produced through continuous profile shifting toward the shaft. The tapered gears are adjusted in the direction of the arrows, as shown in the figure, to reduce backlash.

Planetary Gear (PL)

High permissible torque

Centered output shaft

Backlash: 20 ~ 25 arc min (0.33º ~ 0.58º)

Gear ratios: 5:1, 10:1, 36:1

Frame sizes: 1.65 in. and 2.36 in.

Available for: RBK Series, PK Series

PL Geared

The PL gear mechanism is comprised primarily of a sun gear, planetary gears and an internal tooth gear. The sun gear is installed on the central axis surrounded by planetary gears enclosed in an internal tooth gear centered on the central axis.

PS Geared
(Planetary)

Planetary Gear (PS)

High permissible torque / maximum torque

High resolution

Low backlash with center shaft

Backlash: 15 ~ 25 arc min (0.25º ~ 0.42º)

Gear ratios: 5:1, 7.2:1, 10:1, 25:1, 36:1 and 50:1

Frame Sizes: 1.65 in., 2.36 in. and 3.54 in.

Available for: AR Series (AC Input), AR Series (DC Input), RK Series, CRK Series & CRK with Built-In Controller Series

PS Geared

The PS gear mechanism is comprised primarily of a sun gear, planetary gears and an internal tooth gear. The sun gear is installed on the central axis surrounded by planetary gears enclosed in an internal tooth gear centered on the central axis.

Planetary Gear (PN)

High speed (low gear ratio), high accuracy positioning

High permissible / maximum torque

A wide variety of gear ratios for selecting the desired step angle (resolution)

Centered output shaft

Backlash: 2 ~ 3 arc min (0.034º ~ 0.05º)

Gear ratios: 5:1, 7.2:1, 10:1, 25:1, 36:1, 50:1

Frame sizes: 1.10 in., 1.65 in., 2.36 in. and 3.54 in.

Available for: AR Series (AC Input), AR Series (DC Input), RK Series and CRK Series

PN Gear
The PN gear employs a planetary gear speed-reduction mechanism. The PN gear achieves the specified backlash of three arc minutes through the improved accuracy of its components and the backlash-elimination mechanism. That mechanism is comprised of two sets of internal and planetary gears on the upper and lower levels with the internal gears and planetary gears reduce clockwise backlash; the lower-level internal gears and planetary gears reduce counterclockwise backlash.

Harmonic Gear (HG)

High accuracy positioning

High permissible / maximum torque

High gear ratios, high resolution

Centered output shaft

Backlash: 0 arc min

Gear ratios: 50:1, 100:1

Frame sizes: 0.79 in., 1.65 in., 2.36 in. and 3.54 in.

Available for: AR Series (AC Input), AR Series (DC Input), AS Series, ASC Series, RK Series and CRK Series

Spur Gear (SH)

A wide variety of low gear ratios

Backlash: 1° to 2°

Gear ratios: 3.6:1, 7.2:1, 9:1, 10:1, 18:1, 36:1

Frame sizes: 1.10 in., 1.65 in., 2.36 in. and 3.54 in.

Available for: CMK Series, PK Series

SH Geared

The SH geared type is for use with 2-phase stepping motors when it is necessary to reduce reflected inertia, increase the output torque or increase the speed of the motor to avoid vibration.