Precision caged ball screw thk

Technical Information

Types

High Speed Model SBN-V
Model SBK
High Speed Model SBKN
High Load Model HBN-V
High Load Model HBN-K/Model HBN-KA
High Load Model HBN
High-Load Ball Screw for Presses Model HBN-KP
High-load High-speed Ball Screw Model SBKH

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

A. 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.

B. 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.

C. 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.

D. 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

[Conditions]

Item	Description
Sample	Caged ball screw HBN3210-5 Conventional Type: Model BNF3210-5
Stroke	600mm
Lubrication	Grease lubrication (lithium-based grease containing extreme pressure agent)

E. 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

[Test Conditions]

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	1.27 kN
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

[Test Conditions]

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	36.1 kN (0.38Ca)
Acceleration	0.5G

=> Test result: Shows no deviation after running for the calculated service life.

F. Smooth Motion

● Low Torque Fluctuation

The caged ball effect allows smoother motion than the conventional type to be achieved, thus reducing torque fluctuation.

[Conditions]

Item	Description
Shaft diameter/lead	25/5mm
Shaft rotational speed	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 Temas.