Products Power Transmission Products

  • Servomotor Reducer

PAT-B Straight Type [S]

Concentric shaft type high-precision servomotor reducers using double row angular contact ball bearings

  • Applied servomotor: 0.05 to 22kW
  • Line-up with 7 sizes and 15 reduction ratios
  • Reduction Ratio: 1/3 to 1/100
  • Backlash: 3 to 7 arcmin

We are discontinuing sales on May 31, 2018.

PAT-B Straight Type [S]


Environmental Resistance
Stainless steel is used for the case body and output shaft to achieve high rust/corrosion resistance
Quiet Operation
The high-precision helical planetary gear provides a smooth mesh that maintains even load balancing for quiet operation.
High Efficiency & Compact
The helical planetary gear mechanism delivers high efficiency. The ring gear is machined integrally to the housing, allowing for a more compact design.
Low Backlash
High level gear cutting technology achieves low backlash
Mount Code
Standard line of flanges compatible with servomotors from various manufacturers

2.Structure & Operating Principles

Structure & Operating Principles
[Planetary Type]
The ring gear is fixed, and the sun gear shaft serves as the drive shaft while the planetary carrier shaft serves as the driven shaft. The drive shaft and driven shaft reduce speed by rotating in the same direction.

3.Reference Number System

Reference Number System
(1)Frame No.
S: Straight Type
(3)Reduction Ratio
1-Stage: 3, 4, 5, 7, 9, 10
2-Stage: 15, 20, 25, 30, 35, 40, 50, 70, 100
(4)Output Shaft
K: With Key (Standard), S: Without Key
P1 (Precise):
[1-Stage] 3 arcmin or less,
[2-Stage] 5 arcmin or less
P2 (Standard):
[1-Stage] 5 arcmin or less,
[2-Stage] 7 arcmin or less
(6) Mount Code
Applied Motor Maker/Model No. (Ex.: E4H, G5L, K3Y)

*Frame No. 16A and 22A are only for double reduction models. Please contact us for properties, dimensions, etc.