Flexible Beam Couplings
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Beam Couplings from Ruland

 
 

About

Beam Couplings are available in aluminum and stainless steelRuland manufactures three series of zero backlash beam couplings in inch or metric dimensions with bores ranging from 3/32" (3mm) to 3/4" (20mm). Flexible beam couplings in all three series are machined from a single piece of aluminum or stainless steel and feature multiple helical cuts. The multiple cut design provides higher torque capabilities and greatly reduced wind-up when compared to commodity type single beam couplings.

The P-Series, F-Series, and MW-Series helical beam couplings each have two sets of spiral slots, a feature that provides superior parallel misalignment capabilities compared to the single beam coupling. Angular misalignment, axial motion and any combination of all three types of misalignment are also easily accommodated by this flexible coupling. Ruland beam couplings have the additional benefit of a balanced design for reduced vibration and higher RPM capabilities.

Helical beam couplings should be used in applications in which misalignment exists between the two shafts being coupled. The F-Series helical couplings are ideal for light duty power transmission applications such as coupling a servo motor to a lead screw in a motion control system. These flexible couplings feature larger body size and stronger beams to provide high torque capacity and very low windup, while not sacrificing misalignment capabilities. The demanding nature of reversing servo applications make the performance benefits delivered by the F-series beam couplings vital to maintaining the accuracy, repeatability and reliability of the system. F-series helical couplings with socket head cap screws include Ruland's exclusive Nypatch® coating. This coating reduces vibration which can cause threads to loosen, and reduces galling of the screw threads in stainless steel shaft couplings.

The P-Series and MW-Series flexible beam couplings are designed specifically for precision applications, especially those that use delicate components such as encoders and tachometers. The small bearings on these components make low radial forces essential to longevity and continued high performance. The P and MW-series helical couplings provide extra flexibility to yield reduced bearing loads. These flexible couplings are shorter than the F-series beam couplings and conform to industry standard lengths, fitting into confined spaces and allowing for easy retrofits in existing equipment. At the same time, the helical cut pattern continues to provide excellent torque capabilities and low wind-up. Ruland beam couplings are an economical choice for servo applications.

The MW-Series differs from the P-series in that all of its dimensions are purely metric.

Learn more about how to choose a helical beam coupling for your particular application from a Ruland expert. Read "What to Look for in a Servo Coupling" written by William Hewitson, Vice President of Operations.

Also, when choosing a flexible coupling, read about the advantages of the F-Series six beam coupling here.

Why Ruland

    Flexible Beam Coupling
  • Higher torsional rigidity than commodity style single-beam coupling.
  • Unique balanced clamp screw design reduces vibration while the cross cut increases clamping ability.
  • Machined from a single piece of aluminum or stainless steel with multiple spiral cuts for higher torsional stiffness and torque capabilities.
  • Accommodate parallel misalignment, angular misalignment and axial motion.
  • Two sets of cuts around center member better accommodate parallel misalignment then single beam couplings.
  • Four beam and six beam couplings offered.  Four beam couplings are more flexible with lower bearing loads. Six beam couplings have increased torque capacity and higher torsional stiffness.
  • Aluminum couplings made from type 7075 aluminum for longer life.
  • Stainless steel couplings offered for greater torque capacity.

E-Catalog

FCR Beam Coupling
FCR F-Series
Inch Dimensions
Clamp Style
FCMR Beam Coupling
FCMR F-Series
Metric Dimensions
Clamp Style
FSR Beam Coupling
FSR F-Series
Inch Dimensions
Set Screw
FSMR Beam Coupling
FSMR F-Series
Metric Dimensions
Set Screw
PCR Beam Coupling
PCR P-Series
Inch Dimensions
Clamp Style
PCMR Beam Coupling
PCMR P-Series
Metric Dimensions
Clamp Style
PSR Beam Coupling
PSR P-Series
Inch Dimensions
Set Screw
PSMR Beam Coupling
PSMR P-Series
Metric Dimensions
Set Screw
  MWC Beam Coupling
MWC MW-Series
Full Metric Dimensions
Clamp Style
  MWS Beam Coupling
MWS MW-Series
Full Metric Dimensions
Set Screw
Inch to Metric Beam Coupling
F-Series
Inch to Metric Bores

Inch to Metric Dimensions
Clamp Style & Set Screw
Inch to Metric Beam Coupling
P-Series
Inch to Metric Bores

Inch to Metric Dimensions
Clamp Style & Set Screw
Inch to Metric Beam Coupling
MW-Series
Inch to Metric Bores

Inch to Metric Dimensions
Clamp Style & Set Screw
 

Custom Designs

Custom Beam CouplingAs a service to our customers, we offer our vast machining experience and talents to meet special needs with custom parts. Our shop is equipped with the machines and skilled people necessary to fill all of your special requirements. If you don't see what you are looking for in our standard line, please inquire about our custom fabrication service.

Examples of Past Specials:

  • Anodized beam couplings
  • Special bore sizes and geometry
  • Special lengths, widths and outside diameters
  • Special material and hardware requests
  • And Many Others... Please Contact Us for More Information

Articles/ News

Ruland couplings

Technical Article

What to look for in a Servo Coupling

Selecting a coupling for a servo application can be a complex process. It involves many different performance factors, including: torque, shaft misalignment, stiffness, rpm, space requirements, and others, that all must be satisfied for the coupling to work properly. Before selecting a coupling, it is helpful to know the specifics of these issues for the application for which the coupling is to be used. Many different types of servo couplings exist with their own individual strong and weak points. This article is designed to introduce end users to the different types of couplings available for servo applications. It also helps the user select the proper coupling for their application by highlighting the factors that should be considered in the decision making process and how they relate to the different product offerings available.

Click here to read complete article

Click here to download PDF

beam coupling failure

Technical Article

Avoiding Coupling Failure: Considerations in Design Selection

Mechanical couplings have a principal use in the connection of rotating shafts for the transfer of rotary motion and torque. As with all mechanical devices, a coupling must match its’ intended purpose and application parameters, including many different performance, environmental, use and service factors. All must be satisfied for the coupling to work properly. When selected with these design parameters in mind, and when installed and operating correctly, a coupling should have no failure issues over it’s’ lifetime. However, when one or more of these is not met a coupling can prematurely fail, resulting in either a small inconvenience or possibly serious financial loss or personal injury. This article provides a view of the primary reasons couplings fail, and the steps that can be taken to minimize the risk of failure.

Click here to read complete article

Click here to download PDF

August 2014

Beam Couplings for Medical Applications

Press Release

Beam Couplings for Medical Applications

Ruland beam couplings are zero backlash, have high torsional stiffness and accommodate misalignment making them well suited for encoder, tachometer, and light duty power transmission applications commonly found in medical equipment. They offer low inertia, light bearing loads, and a balanced design for reduced vibration at higher speeds.

May 2013

Beam Coupling

Press Release

Beam Couplings for Encoder Feedback Systems

Ruland manufactures beam couplings designed specifically for encoder feedback systems. P- and MW-Series beam couplings offer high misalignment capabilities with low bearing loads.  Machined from a single piece of aluminum or stainless steel, these couplings feature two sets of two spiral cuts for increased torsional rigidity, accuracy, and repeatability compared to single beam couplings.  

November 2012

Servo couplings for a wide variety of applications

Press Release

Servo couplings for a wide variety of applications

Ruland manufactures a diverse line of servo couplings to provide solutions for applications such as stepper/servo systems, linear actuators, ball screws, lead screws, encoders, and valve actuation. Industries including medical, printing, packaging, machine tools, linear motion, semiconductor, and solar benefit from having a variety of couplings to choose from. Each application has performance requirements that must be met for the system to function properly. Understanding the different characteristics of each coupling is critical when making a selection.

February 2011

Backlash-Free Couplings

Press Release

Backlash-Free Couplings for High-Tech Applications

For high technology applications such as test and measurement, inspection, semi-conductor, solar panel production equipment as well as medical devices, Ruland manufactures a variety of components including oldham couplings and beam couplings.

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F-Series
Six Beam Coupling

P-Series
Four Beam Coupling

MW-Series
Full Metric Dimensions