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Couplings, Flexible Shafts & Universal Joints

Precision Bellows Couplings

Precision Bellows Couplings


SDP/SI Bellows Couplings are flexible couplings designed to accommodate various types of load conditions. SDP/SI Hi-Flex Bellows Couplings are used for applications which require large amounts of shaft misalignment combined with low resultant radial loads on the bearings. SDP/SI Modular Bellows Couplings are configurable and provide high torsional rigidity for high speed torque transmission. A wide variety of bore sizes and combinations are offered to accommodate specific needs.

Commercial and Precision Flexible Couplings

Commercial & Precision Flexible Couplings


Flexible Couplings have the ability to compensate for shaft misalignment and are designed to accommodate various types of load conditions. No one type of coupling can provide the universal solution to all coupling problems; hence many designs are available, each possessing construction features to accommodate one or more types of application requirements. SDP/SI offers many styles of flexible couplings, such as bellows couplings, helical couplings, Oldham couplings, universal joints, and flexible shafts.

Commercial and Precision Helical Couplings

Commercial and Precision Helical Couplings


SDP/SI Helical Couplings, or beam couplings, are another type of flexible coupling allowing for axial motion, angular misalignment and parallel offset. This coupling design features one-piece construction resulting in zero backlash. The coupling is made flexible by removing material from the piece in a spiral pattern. SDP/SI Helical Couplings are available in aluminum and stainless steel.

Precision Junior (BoWex Nylon) Couplings

Precision Junior (BoWex Nylon) Couplings


Two-and Three-Piece Junior Coupling is a curved tooth gear coupling made of nylon. Designed to compensate for axial, radial and angular misalignment, it is lightweight and maintenance free.

Precision Miniature Ball Couplings

Precision Miniature Ball Couplings


Precision Multi-Jawed Couplings

Precision Multi-Jawed Couplings


SDP/SI Precision Multijawed Coupling is a rigid coupling that accommodates minimal shaft misalignment. The helical gear coupling enables a positive connection between two shafts that can be disconnected or connected at any time when stopped.

Commercial and Precision Oldham Couplings

Commercial & Precision Oldham Couplings


Oldham Couplings consist of three members. A floating member is trapped by 90° displaced grooves between the two outer members which connect to the drive shafts. Oldham Couplings can accommodate lateral shaft misalignments up to 10% of nominal shaft diameters and up to 3° angular misalignments. Lubrication is a problem but can in most applications be overcome by choosing a coupling that uses a wear resistant plastic or an elastomer in place of steel or bronze floating members.

Commercial and Precision Rigid Couplings

Commercial & Precision Rigid Couplings


Rigid Couplings have limited applications as compared to flexible couplings. Rigid couplings do not have the ability to compensate for shaft misalignments and are therefore used where shafts are already positioned in precise lateral and angular alignment. Rigid couplings because of their simple rugged design are generally able to transmit more power than flexible couplings of comparable size but this is not an important advantage except in high horsepower applications.

Precision Slip-Type Couplings

Precision Slip-Type Couplings


SDP/SI Slit Type Couplings are a flexible coupling designed similarly to the helical coupling or beam coupling; one piece construction and no backlash. The Slit Type Coupling features high torque capacity, high flexibility, and high torsional stiffness. Manufactured in aluminum, stainless steel and engineered polymer.

Commercial Flexible Shafts with Casing

Commercial Flexible Shafts with Casing


Commercial Flexible Shafts without Casing

Commercial Flexible Shafts without Casing


Commercial Metal Universal Joints

Commercial Metal Universal Joints


Single and double joint stainless steel and alloy steel universal joints are offered with a variety of bore sizes. Miniature universal joints feature zero backlash, sealed-in lubrication and low inertia. Inverted design universal joints are small in size and lightweight for given torque capacity. These joints may be made into telescoping units by mating them with telescoping miniature ball splines.

Commercial Plastic Universal Joints

Commercial Plastic Universal Joints


Plastic universal joints are inexpensive, dampen vibration, electrically insulating, and are well suited for low torque applications. We offer a wide variety of sizes and styles as standard catalog items. We can also manufacture them to specific requirements, please consult SDP/SI Engineering for further details.

Commercial and Precision Telescoping Universal Joints

Commercial & Precision Telescoping Universal Joints


Stainless steel telescoping universal joints are offered in a number of sizes and are heat and corrosion resistant. Telescoping miniature universal joints feature zero backlash and accommodate 1/4 axial motion. Molded universal joints with a molded slide extension or brass slide extension are available in a variety of sizes, shorter or longer lengths are available on special order.

Precision Zero Backlash Universal Joints

Precision Zero Backlash Universal Joints


Couplings

Couplings are devices used to connect two shafts together and are divided into two categories: Rigid and Flexible. Both are used for the purpose of transmitting power, rigid couplings being more limited in applications as compared to flexible couplings. Rigid couplings are used where shafts are already positioned in precise lateral and angular alignment. Their design does not allow for any misalignment between shafts, but are generally able to transmit more power than flexible couplings. Flexible couplings are designed to accommodate misalignment between shafts and various types of load conditions. Many styles and types of couplings are available. For successful coupling selection, application conditions must be clearly understood.


SDP/SI offers a wide variety of both rigid and flexible couplings. Many of our couplings are designed with the unique Fairloc® Hub design, including the Miniature Fairloc® Bellows Coupling and the Neo-Flex Coupling. Modular Bellows Couplings can be configured to accommodate various shaft diameters and provide backlash-free torque transmission. Magnetic Disk Couplings are built to handle up to 3° of angular offset and operate in temperatures up to 284°F.

Flexible Shafts are also offered by SDP/SI and can be substituted in place of more expensive gear trains and universal joints in applications where the load must be moved in many directions. Flexible Shafts are stiff in torsion and very compliant in bending and lateral misalignments. They are extremely useful where the load is located in a remote position requiring many gear and shafting combinations. The basic design considerations are torque capacity, speed, direction of rotation, bend radii and service conditions.




Metal and Molded Universal Joints

Universal Joints
Universal joints are used to transmit power, motion or both. It is a mechanical connection between intersecting shafts, which are usually not parallel. Cardan joint or Hooke joint is the most common and consists of two yokes, one on each shaft, connected by a cross-shaped intermediate member called the spider. The angle between the shafts is called the operating angle. It is usually constant during operation, but not necessarily so. Good design practice calls for low operating angles, often less than 25°.

Universal joints are available in steel or in thermoplastic body members. For maximum load-carrying capacity for a given size a steel universal joint should be selected. Universal joints with thermoplastic body members are used in light industrial applications in which their self-lubricating feature, light weight, negligible backlash, corrosion resistance and capability for high-speed operation are significant advantages. Ball-jointed universals are used for high-speed operation and for carrying large torques. They are available in miniature and standard sizes.

SDP pioneered the concept of combining the exceptional qualities of selected plastic materials with different metals to create products which incorporate both. “SUPER-PLAST®” designs have the following advantages:
  • Inexpensive replacement of metal components
  • Dampens vibration
  • Corrosive and chemical resistant
  • Electrically insulated

SDP/SI offers an extensive selection of inch and metric dimensioned universal joints available in steel, stainless steel, acetal and acetal with brass spider and inserts as standard catalog items.

The molded universal joints can be manufactured to special requirements:
  • Bores molded to accommodate square, “D” shape or hexagonal shafts
  • Shafts molded into the components
  • Zero backlash or components with built-in backlash
  • Gears, pulleys or other components molded or assembled to couplings or universal joints

Call to discuss your special need or application.