Jaw Coupling

Aluminum flexible rubber jaw coupling spider for semiconductor

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Introduction

  • Jaw couplings undergo a proprietary hub machining process to produce a curved jaw profile that press fits with the spider, assuring zero-backlash operation. The curved jaw profile concentrates the forces on the center of the spider’s limbs, improving the effectiveness of the elastomer material. Jaw couplings are considered fail-safe because if the spider were to fail, the jaws of the two hubs interlock for direct power transmission, allowing the application to be safely shut down for maintenance.
  • Made of an advanced polyurethane material, the jaw coupling spider dampens impulse loads while minimizing shock to the motor and other sensitive equipment. Stand-offs on the spider limbs help installers maintain proper spacing between the two hubs, assuring electrical isolation and full angular misalignment capabilities. Spiders are designed to be the coupling’s wear element, making replacement cost-effective and simple while restoring full performance abilities to the coupling.
  • These couplings require no lubrication and provide highly reliable service for light, medium, and heavy-duty electrical motor and internal combustion power transmission applications.
    Zero-backlash jaw couplings with bore sizes ranging from 3mm to 32mm. Jaw couplings feature a highly customized three-piece design, have low inertia, and are well suited for applications requiring dampening in semiconductor, solar, machine vision, liquid handling, and medical.
  • plastic drive shaft collar coupling for stepper motor

Application

  • Include power transmission to industrial equipment such as pumps, gearboxes, compressors, blowers, mixers, and conveyors.
  • ZS’s Jaw Type couplings are available in 24 sizes, from a minimum torque rating of 3.5 in-lbs (0.4 Nm) to a maximum torque rating of 170,004 in-lbs (19209 Nm) and a bore range of .125 inches (4.45mm) to 7 inches (178mm).
  • ZS’s standard bore program covers AGMA, SAE, and DIN bore/keyway and spline bore combinations.
  • Jaw Type couplings generally consist of two hubs (available in sintered metal, aluminum, bronze, steel, stainless steel, and ductile iron) and an elastomer element known as a spider or cushion (materials available include NBR SOX rubber, Urethane, Hytrel, and Bronze).

Feature

  • The lightweight aluminum version of the industry-standard shaft coupling
  • Interchangeable with L and SS line of hubs
  • Corrosion-resistant (finished bores passivated for additional protection)
  • Accommodates for angular and parallel shaft misalignment
  • Fail-safe – will still perform if elastomer “spider” fails
  • No metal to metal contact
  • Resistant to oil, dirt, sand, moisture, and grease

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Jaw coupling

The jaw coupling is a general-purpose power transmission coupling that can also be used in motion control (servo) applications. It is designed to transmit torque (by connecting two shafts) while dampening system vibration and accommodating misalignment, protecting other components from damage. A claw coupling consists of two metal hubs, and an elastomer insert called an element but often called a “spider.” The three sections are press-fitted together with the lower jaws of each hub, mounted alternately with the spider’s blades. Jaw coupling torque is transmitted through compressed elastomer blades.

Spider’s elastomers can be made in different materials and hardnesses, which allows users to customize the coupling to best serve their application. Elastomer selection considerations include the ability to dampen vibration, the ability to handle misalignment, operating temperature range, equipment speed, and chemical conditions.

Jaw couplings are considered “fail-safe” because if the elastomer fails or wears out, the jaw coupling hub teeth will match up just like the teeth on both gears and continue to transmit torque. Depending on the application, this may or may not be desirable for the user.

The claw coupling elastomer is a wear element that needs to be inspected and replaced. Jaw coupling elastomers often have a characteristic wear pattern, and failures are often caused by the condition of the elastomer and hub. Common failure causes include misalignment, over-torque, chemical exposure, temperature exposure, torsional vibration, and hub failure.

Jaw couplings are available in straight and curved jaw designs. Straight tooth design enables radial attachment and removal of elastomers, including a “non-fail safe” jaw elastomer shear design. For internal elastomer shear designs, the coupling hub teeth no longer mesh with each other, so elastomer failure will result in no torque transfer. When used with rigid elastomers, the curved jaw design maintains the zero-backlash fit required for many motion control applications.

Zero Backlash Bending Jaw Couplings are best for applications that rely on stop-and-go motion, where accuracy is required at the stop for any number of precision tasks, such as taking high-resolution photos (machine vision system). Absorbing vibrations reduces the settling time required for the system, thereby increasing throughput. Claw couplings are less suitable for applications that rely on the type of constant sweep motion where precision is required during motion, which requires a more torsional coupling.

Like other elastic couplings, claw couplings are limited in the shaft misalignment they can accommodate. Excessive axial movement can cause couplings to separate, while excessive angular or parallel misalignment can cause bearing loads that can lead to premature system wear or failure.

With its damping capabilities, interchangeable pawls, and numerous customization options, pawl couplings provide an excellent solution for shock absorption and torque transmission in many applications.

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