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High Torque Caged Ball Spline

THK's cage technology, which is the culmination of its technologies and know-how, has been applied to ball splines.
The use of a ball cage maintains the aligned circulating motion and enables high-speed operation.
The cage prevents balls from impacting each other and causing mutual friction, enabling low noise and low dust generation. They also allow for long-term maintenance-free operation by improving grease retention.
The torsional rigidity of the nut is ensured through a high-torque structure. Shaft rigidity is also improved by approximating the form of the spline shaft to a circular shape.

Kinds

Highlight feature tags

  • Long-term maintenance free
  • High torque type
  • Flanged type
  • Cylindrical type
  • Solid spline shaft
  • Hollow spline shaft
Model SLS
  • Long-term maintenance free
  • High torque type
  • Cylindrical type
  • Solid spline shaft
  • Hollow spline shaft

Splineshaftdiameter(mm) : 25,30,40,50,60,70,80,100

Model SLF
  • Long-term maintenance free
  • High torque type
  • Flanged type
  • Solid spline shaft
  • Hollow spline shaft

Splineshaftdiameter(mm) : 25,30,40,50,60,70,80,100

Features

Structure and features

The caged-ball technology, developed by bringing together THK’s technologies and know-how, is now integrated in the new Ball Spline.
The integration of the ball cage enables the circulating motion of evenly spaced balls and high-speed response to be achieved.
It eliminates collision and mutual friction between balls, and realizes low noise, pleasant running sound and low particle generation. As the grease retention is increased, long-term maintenance-free operation is also achieved.
The high-torque design provides the nut with excellent torsional rigidity. The spline shaft also has enhanced rigidity, thanks to its rounded design.

High-speed Response

Models SLS/SLF adopt the caged-ball technology to enable the circulating motion of evenly spaced balls to be maintained and high-speed response to be achieved, the cycle time of the machine can be improved.

[Conditions]

Model tested

SLS50

Testing environment

22 to 27.5℃

Stroke

1000mm

Maximum speed

200m/min

Acceleration/deceleration

5G(49m/s2)

Applied load

Light preload(CL)

Lubricant

THK AFB-LF Grease

[Test results] No anomaly after travelling 10,000 km

Improvement on the spline shaft’s rigidity

Redesigning the shape of the conventional high torque type spline shaft to be more circular significantly improves its torsion and flexural rigidity.

Unit: mm

Nominal shaft diameter 25

LBS

SLS

Minor diameter ø d

19.5

21.6

Major diameter ø D0

24.5

25.0

Ball center-to-center diameter ø dp

25

25.2

Low Noise, Pleasant Running Sound and Low Particle Generation

Models SLS/SLF adopt the caged-ball technology, they eliminate collision and mutual friction between balls, and realize low noise, pleasant running sound and low particle generation.

[Conditions]

Model tested

SLF50/LBF50

Stroke

600mm

Speeds

30,50,100,150m/min

Measuring instrument

Noise level meter


Overview of the test machine

[Conditions]

Model tested

SLF50CL+350LP/ LBS50CL+350LP

Maximum speed

30m/min

Acceleration

2.84m/s2

Stroke

200mm

Amount of air supplied

1L/200s

Lubricant

THK AFE-CA Grease

Equipment using the
product

Particle counter

Appearance of the test machine

Long-term Maintenance-free Operation

Models SLS/SLF adopt the caged-ball technology to substantially increase the grease retention, thus achieving long-term maintenance-free operation.

Smooth Motion (Small Rolling Fluctuation)

Models SLS/SLF adopt the caged-ball technology and a new circulation method, thus achieving stable and smooth motion with small rolling fluctuation.

[Conditions]

Model tested

SLF50

Speed

10 mm/sec

Applied load

Medium preload(CM)

Lubricant

THK AFB-LF Grease

Types of Spline Shafts

Precision Solid Spline Shaft (Standard Type)
The spline shaft is cold-drawn and its raceway is precision ground. It is used in combination with a spline nut.
Special Spline Shaft
THK manufactures a spline shaft with thicker ends or thicker middle area through special processing at your request.
Hollow Spline Shaft (Type K)
A drawn, hollow spline shaft is available for requirements such as piping, wiring, air-vent and weight reduction.

Housing Inner-diameter Tolerance

When fitting the spline nut to the housing, transition fit is normally recommended. If the accuracy of the Ball Spline does not need to be very high, clearance fitting is also acceptable.

Table1 Housing Inner-diameter Tolerance

Housing Inner-diameter Tolerance

General conditions

H7

When clearance needs to be small

J6