RV / HRV - Satellite Roller Screws

RV / HRV Planetary Roller Screws

Rollvis high precision planetary (satellite) roller screws transfer a motor's rotational input into a heavy load capacity, high-precision, durable linear movement. Their design allows for even load distribution and reduced wear, making them a superior alternative to ball screws, hydraulics, and belt or chain drives.

As the RV planetary roller screw shaft rotates, the rollers, which are in contact with both the screw's threads and the nut's threads, also rotate and move in a planetary (orbiting) motion around the screw shaft, converting rotary motion into linear motion. Roller screws can outperform ball screws in nearly every category.

The HRV series, heavy duty planetary roller screws, starts from shaft diameter 60mm and offers an even greater load capacity.

Advantages

Customers can take advantage of the features and benefits of planetary roller screws and heavy duty planetary roller screws in these ways:

• The long service life of planetary roller screw reduces the maintenance cost to the customer. It's not uncommon for RV screws to have a life expectancy 15 times that of a ball screw.
• The compact load density of a roller screw allows machinery and machine components to be smaller, saving both space and money with respect the whole machine design. This is especially true with the small screws where the load capacity of ball screws is limited by the small ball size.
• Electrification - the ultra high load density in the HRV type screws is key to being able to replace hydraulic systems with an electro-mechanical solution.
• The external dimensions are the same for any value of lead which makes the screws extremely flexible to use for a machine designer. The HRV increases the length of the nut, but the shaft and Nut diameter remain the same.

Industries

• Automotive Assembly & Manufacturing Processes: Very demanding production volumes demand reliable uptime and roller screws have long been at the core of systems used for welding, riveting and gluing with automotive assembly lines.
• Metal Forming and Shaping Presses: The need for high peak loads is a key factor when forming, punching, or bending metal parts. Roller screws are ideally suited for these types of applications.
• Aerospace: Reliability under extreme conditions and a range of construction materials suitable for controlling air-and spacecraft components.
• Oil and Gas: Oil and Gas equipment and machinery need precise, reliable heavy-duty roller screws for valve actuation, drilling equipment, and pump jacks.
• Medical Devices: When smooth, precise and high force movements are needed, roller screws are selected.

Applications

• Electro-Mechanical Actuators: Planetary roller screws are at the core of elctromechanical actuators that are used when replacing hydraulic systems.
• Injection Molding Machines: Precise control over motion, with high loads, to produce high-quality plastic parts with tight tolerances and in very high production volumes.
• Spot Welding: Reliability for millions of cycles are key for automotive production.
• High-volume riveting operations: High speed with high impact forces - Roller screws are selected to match a need for long service.
• Robotic Joints: Roller screws offer a company and high option when considering linear actuation as part of modern robotics and prosthetics.
• Metal forming, punching & pressing: High loads are required when forming, bending or punching metal parts. These operations often involve a high speed movement with impact loading at the end of the stroke.