The NB Ball Screw Spline consists of a high accuracy, high rigidity Ball Screw nut and Ball Spline nut attached to the ball screw spline shaft which has a screw groove and spline grooves. SPBR type has a Rotary Ball Screw nut and Rotary Ball Spline nut. Rotary Ball Screw nut is an integration of ball screw nut and angular contact bearings. Rotary Ball Spline nut is an integration of ball spline nut and angular contact bearings. SPBF type has a Rotary Ball Screw nut and a Ball Spline nut.

A single axis of the NB Ball Screw Spline can provide positioning, linear and rotary motion as well as combined spiral motion.

The typical applications are SCARA robot, assembly machine, loader, etc.

Preload

The preload is properly adjusted for the ball screw nut, spline nut, and angular contact bearings.

The NB BALL SPLINE is a linear motion mechanism utilizing the recirculating motion of ball elements that can sustain loads and transfer torque either simultaneously or independently. It can be used in a wide variety of applications including robotics and transport type equipment.

Key Features At-a-Glance

NB ball splines are comprised of a shaft and nut assembly. Ball spline shafts feature raceway grooves. Nut assemblies consist of an outer cylinder, retainer, side rings and ball elements. This type of configuration offers many advantages, including:

• Reliably smooth motion with specially designed spline nut and shaft
• High load capacity and long travel life are realized by large ball contact areas and machined grooves that maintain a close radius between shaft and nut components
• Precise high torque transmission capability with an effective contact angle between shaft and ball elements
• Adjustable preloads that can be configured to deliver higher rigidity and positioning accuracy
• High-speed motion performance is realized with a well-balanced, compact outer cylinder design

Configurations and Applications

To support a wider range of installations and applications, NB manufactures several different ball spline nuts:

• SSP/SSPS cylindrical-type spline nuts with a key groove and special key
• SSPM cylindrical-type spline nuts without a key groove, with lock plates
• SSP-AM/SSPS-AM special compact cylindrical-type spline nuts with a countersink and special key
• SSPF/SSPFS flanged spline nuts
• SSPT flanged spline nuts with two side cut flange

We also can machine spline shafts to custom specifications. All NB ball spine nuts bearings feature standard side seals for dust protection. For detailed information about each product, download the NB ball spline catalog or speak with a sales representative directly.

The NB BALL SPLINE is a linear motion mechanism utilizing the recirculating motion of ball elements that can sustain loads and transfer torque either simultaneously or independently. It can be used in a wide variety of applications including robotics and transport type equipment.

Key Features At-a-Glance

NB ball splines are comprised of a shaft and nut assembly. Ball spline shafts feature raceway grooves. Nut assemblies consist of an outer cylinder, retainer, side rings and ball elements. This type of configuration offers many advantages, including:

• Reliably smooth motion with specially designed spline nut and shaft
• High load capacity and long travel life are realized by large ball contact areas and machined grooves that maintain a close radius between shaft and nut components
• Precise high torque transmission capability with an effective contact angle between shaft and ball elements
• Adjustable preloads that can be configured to deliver higher rigidity and positioning accuracy
• High-speed motion performance is realized with a well-balanced, compact outer cylinder design

Configurations and Applications

To support a wider range of installations and applications, NB manufactures several different ball spline nuts:

• SSP/SSPS cylindrical-type spline nuts with a key groove and special key
• SSPM cylindrical-type spline nuts without a key groove, with lock plates
• SSP-AM/SSPS-AM special compact cylindrical-type spline nuts with a countersink and special key
• SSPF/SSPFS flanged spline nuts
• SSPT flanged spline nuts with two side cut flange

We also can machine spline shafts to custom specifications. All NB ball spine nuts bearings feature standard side seals for dust protection. For detailed information about each product, download the NB ball spline catalog or speak with a sales representative directly.

You can use NB rotary ball splines in many applications requiring linear and/or rotational motion, such as automatic tool changers, SCARA robots and pick-and-place assembly equipment. Their unique design features a spline nut with a rotating portion that moves via cross rollers. This configuration offers many advantages, including high accuracy and a substantial reduction in installation costs.

Key Features At-a-Glance

NB ball splines provide linear and rotational motions using a combination of spline nut and rotary cross roller bearing design. Splines feature arch-shaped grooves on both the shaft and inner portion of the cylinder. These grooves approximate the diameter of the ball bearings, allowing them to carry a high load in a linear motion. Notable features of this type of design include:

Increased load capacity

The rotary to linear mechanism of NB ball splines can typically handle 10 times the load of conventional ball bushings, which only maintain a single point of contact at any given time.

Greater travel life

By utilizing the large ball contact surface of arch-shaped grooves, travel life is extended by up to 700 times (compared to conventional ball bushings).

Fewer number of parts

Similarly, by providing both linear and rotational motions, NB ball splines effectively perform the work of two components. In addition to allowing for smaller devices, this also minimizes the number of parts required, which saves you money and reduces maintenance requirements.

Increased opportunities for miniaturization

NB ball splines feature a single-axis configuration that, when compared to the dual-axes system of most ball bushings, allows for smaller and lighter systems overall.

High Accuracy

NB ball splines’ cross rollers provide exceptional accuracy in any application in which precision is a necessity.

Higher rigidity

The compact design of NB ball splines doesn’t come at the expense of rigidity, thanks to their four-row ball circuit structure.

For a complete list of operating instructions and technical specifications, please download the product catalog or consult with an NB representative today.

The NB STROKE BALL SPLINE SPLFS type is a high accuracy linear motion bearing with a limited stroke, to which both radial load and torque can be applied at the same time. It operates with extremely small dynamic friction.

The NB STROKE BALL SPLINE consists of a nut and a shaft both with raceway grooves.

The flanged spline nut consists of an outer cylinder, a retainer, side-rings, and ball elements. Since the retainer in the nut is equipped with ball pockets, the ball elements do not contact each other, which allows for a smooth linear motion. The stroke is limited since the retainer is a non-circulating type. For normal operation, it is recommended to consider 80% of the maximum stroke shown in the dimension table as an actual stroke length.

Extremely Small Dynamic Friction and Low Noise

The rolling elements are separated by the ball pockets so that they do not contact each other. The stroke length is limited, but extremely small dynamic friction and low noise are realized because the rolling elements do not circulate.

All Stainless Steel Type

Since all the components are made of stainless steel, this stroke ball spline has an excellent corrosion resistance and heat resistance (operating temperature: -20 to 140℃). It is ideal for clean room or vacuum applications.

Compact-Size

With the nut about 20% smaller than conventional ball splines, it contributes to space saving.

Lubrication

A lubricant groove and two lubrication holes are provided on the outer surface of the nut, which allow for an easy designing of lubricant replenishment.