THK Linear Actuators - KR Series

THK Linear Actuators

THK Linear Actuators - KR Series

The THK KR Series consists of a highly rigid outer rail with a U-shaped cross section, LM Guide units on both sides and a Ball Screw unit in the center.

  • High Rigidity, Compact and Space Saving
  • Normal, High Accuracy or Precision types
  • 30 mm up to 600 mm Stoke Lengths
  • Motor, Driver, Coupling, Flange, Sensors available

Product Lineup

Model

Frame Size
(mm)

Options

Ball Screw 
Grade

Stroke 
(mm)

Lead
(mm)

Max. Input 
Torque (N·m)

Max. Input 
Speed (r/min)

THK KR20 Linear Actuator

KR20 Type

20 x 40

Covered Type

Normal, High Accuracy and Precision

30, 80, 130

1

0.207

6000

THK KR26 Linear Actuator

KR26 Type

26 x 50

Covered Type

Normal, High Accuracy and Precision

60, 110, 160, 210

2

0.622

6000

THK KR33 Linear Actuator

KR33 Type

33 x 60

Covered Type

Normal or 
High Accuracy

50, 100, 200, 300, 
400, 500, 600

6 or 10

1.244

4700

 


 

LM Guide Actuators

Construction

Because of its integral-structure inner block consisting of a highly rigid outer rail with a U-shaped cross section, LM Guide units on both side faces and a Ball Screw unit in the center, LM Guide Actuator model KR achieves a highly rigid and highly accurate actuator in a minimal space. In addition, since the housings A and B also serve as support units and the inner block as a table, this model allows significant reduction of man-hours required for design and assembly, thus contributing to total cost cutting.

4-way Equal Load

Each row of balls is arranged at a contact angle of 45° so that the rated load on the inner block is uniform under loads applied to the inner block in the four directions (radial, reverse radial and lateral directions). As a result, model KR can be used in any mounting orientation.

Equal Load

High Rigidity

Use of an outer rail with a U-shaped cross section increases the rigidity against a moment and torsion.

High Rigidity


High Accuracy

Since the linear guide section consists of 4 rows of circular-arc grooves that enable balls to smoothly move even under a preload, a highly rigid guide with no clearance is achieved. Additionally, variation in frictional resistance caused by load fluctuation is minimized, allowing the system to follow highly accurate feed.

3 Types of Accuracy Grades Available:

  • Normal Grade: ±0.01 mm
  • High Accuracy Grade: ±0.005 mm
  • Precision Grade: ±0.003 mm

High Accuracy

Load Ratings

Model KR basic load ratings are equal in all four directions.

Load Ratings

Seal

Model KR is equipped with end seals and side seals for dust prevention as standard.

Seal


2-Phase Stepper Motor / Flange / Coupling Kits

The PKP Series 2-phase stepper motors packages offer exceptional performance with low vibration. Available with a 1.8° or 0.9° step angle, standard or with a 200 / 400 line, 3 channel encoder or with an electromagnetic brake for vertical, load holding applications.

NOTE: Do not exceed the Maximum Input Torque for Actuator.


Actuator

Frame Size

Motor Type

KR20 Type

42 mm

2-Phase Bipolar

KR26 Type

42 mm

KR33 Type

42 mm or 56.4 mm

 

Sensor Set

Sensor Set

Optical proximity sensors for use with the THK linear actuators. Mounts to the dedicated sensor rail on the linear actuator.

Actuator

Type

KR20 Type

NPN

PNP

Photo Sensor (NPN)

KR26 Type

NPN

PNP

Photo Sensor (NPN)

KR33 Type

NPN

PNP

Photo Sensor (NPN)

 

CAD / Manual Search

To locate product CAD and Operator Manuals please search using the product Item Number.

Downloads


Technical Articles

Reference

Stepper Motors

Stepper Motor / Flange / Coupling Kit

Stepper Motor Kit

 

2-Phase Bipolar Drivers

 

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