Precision Caged Ball Screw
The use of a ball cage in the caged ball screw eliminates collision and friction between balls and increases grease retention. This makes it possible to achieve low noise, low torque fluctuation, and long-term maintenance-free operation.
In addition, this ball screw excels in high-speed applications because of an ideal ball recirculation structure, a strengthened circulation path, and the use of a ball cage.
Types
Highlight feature tags
- Long-term maintenance free
- Compact
- High speed
- High-load ball screw
- In accordance with ISO standards
- Large lead
- Preload
- No preload
- Offset preload
- Return-pipe type
- Return-piece
- End-cap type
- Double nut
- For presses
- Precision positioning (ball screw)
- Double nut preload
- Precision positioning (ball screw)
- Long-term maintenance free
- Preload
- Offset preload
- High speed
- Return-pipe type
- Return-piece
Screwshaftdiameter(mm) : 16,20,25,28,32,36,40,45,50
- Precision positioning (ball screw)
- Long-term maintenance free
- Large lead
- Preload
- Offset preload
- High speed
- End-cap type
Screwshaftdiameter(mm) : 15,16,20,25,32,36,40,50,55
- Precision positioning (ball screw)
- Long-term maintenance free
- In accordance with ISO standards
- Preload
- Double nut preload
- High speed
- Compact
- Double nut
Screwshaftdiameter(mm) : 31,32,36,38,40,45,50,55,63
- Precision positioning (ball screw)
- Long-term maintenance free
- In accordance with ISO standards
- Large lead
- Preload
- No preload
- High speed
- Compact
Screwshaftdiameter(mm) : 10,12,14,15,16,20,25,28,31,32,36,38,45,50
- Precision positioning (ball screw)
- Long-term maintenance free
- High-load ball screw
- No preload
- High speed
Screwshaftdiameter(mm) : 50,63,80
- Precision positioning (ball screw)
- Long-term maintenance free
- High-load ball screw
- No preload
- High speed
Screwshaftdiameter(mm) : 63,80,100,120,140
- Precision positioning (ball screw)
- Long-term maintenance free
- High-load ball screw
- No preload
- High speed
- Return-piece
Screwshaftdiameter(mm) : 32,36,40,50,63
- Precision positioning (ball screw)
- Long-term maintenance free
- High-load ball screw
- No preload
- High speed
- Return-pipe type
- For presses
Screwshaftdiameter(mm) : 40,63,80,100,120,140
- Precision positioning (ball screw)
- Long-term maintenance free
- High-load ball screw
- Large lead
- No preload
- High speed
- End-cap type
Screwshaftdiameter(mm) : 63,80,100,120
Features
Structure and Features
The use of a ball cage in the caged ball screw eliminates collision and friction between balls and increases grease retention. This makes it possible to achieve low noise, low torque fluctuation, and long-term maintenance-free operation.
In addition, this ball screw excels in high-speed applications because of an ideal ball recirculation structure, a strengthened circulation path, and the use of a ball cage.
Ball Cage Effect
Low noise/reduced running sound
The use of the ball cage eliminates the collision noise between the balls. Additionally, as balls are picked up in the tangential direction, the collision noise from the ball circulation has also been eliminated.
Long-term maintenance-free operation
The friction between balls has been eliminated, and grease retention has been improved through the provision of grease pockets. As a result, long-term maintenance-free operation (i.e. long term operation without lubrication) is achieved.
Smooth Motion
The use of a ball cage eliminates the friction between balls and minimizes the torque fluctuation, thus allowing smooth motion to be achieved.
Low noise
● Noise Level Data
Since the balls in the caged ball screw do not collide with each other, they do not produce a metallic sound, and a low noise level is achieved.
■ Noise Measurement
|
Item |
Description |
|---|---|
|
Sample |
High-Load Ball Screw with Ball Cage HBN3210-5 Conventional Type: Model BNF3210-5 |
|
Stroke |
600mm |
|
Lubrication |
Grease lubrication (lithium-based grease containing extreme pressure agent) |
Long-term Maintenance-free Operation
● High speed and high load-bearing capacity
Thanks to the ball circulating method supporting high speed and the ball cage effect, the caged ball screw excels in high speed and load-bearing capacity.
■ High Speed Durability Test
|
Item |
Description |
|---|---|
|
Sample |
High-Speed Caged Ball Screw SDA3110V-5 |
|
Speed |
5000 (min-1)(DN value*: 160,000) |
|
Stroke |
500mm |
|
Lubricant |
THK AFJ Grease |
|
Quantity |
4 cm3 (lubricated every 500 km) |
|
Applied Load |
1.27kN |
|
Acceleration |
0.5G |
*DN value: Ball center-to-center diameter x revolutions per minute
Test Results
Shows no deviation after running for 6000 km
■ Load Bearing Test
|
Item |
Description |
|---|---|
|
Sample |
High Speed Ball Screw with Ball Cage SBN5016V-5 |
|
Speed |
1500 (min-1)(DN value*: 79,000) |
|
Stroke |
400mm |
|
Lubricant |
THK AFG Grease |
|
Quantity |
57.7 cm3 (lubricated every 100 km) |
|
Applied load |
36.1kN(0.38Ca) |
|
Acceleration |
0.5G |
Test result
Shows no deviation after running for the calculated service life
Smooth Motion
● Low Torque Fluctuation
The caged ball effect allows smoother motion than the conventional type to be achieved, thus reducing torque fluctuation.
|
Item |
Description |
|---|---|
|
Shaft diameter |
25/5mm |
|
Shaft rotational |
100min-1 |
Examples of Assembling Models HBN-V, HBN-K, HBN-KA, HBN, and SBKH
If using models HBN-V, HBN-K, HBN-KA, HBN, or SBKH under a large load, arrange the nut flange and the fixed-side support unit in relation to the loading direction as indicated in the figures below while taking into account the load balance of the balls. In addition, be sure not to apply a tensile load to the bolts while the unit is operating. If you intend to use this product in configurations other than those below, contact THK.
Example Assembly of Models HBN-V, HBN-K, HBN-KA, HBN, and SBKH (Recommended)
Example Assembly of Models HBN-V, HBN-K, HBN-KA, HBN, and SBKH (Not Recommended)
