Couplings & Drive Shafts
Jaw Couplings
Flexible Jaw Couplings for Low to Medium Torque Transmission in a compact space.
Jaw couplings consist of 2 hubs linked via a central elastomeric spider element to provide the “flex”. Wide range of jaw couplings for torque ratings up to 3300Nm. The standard coupling hubs are either of an Aluminium or Sintered Iron material with Steel and Stainless Steel options available on request. Zero backlash and Spacer Couplings (self-supporting shafts) are also available.
Useful Information
Key Features
- Curved jaw design
- Torque ratings from 10Nm to 3300Nm
- 11 Sizes
- Bore sizes up to 110mm
- No need for lubrication
- Quick and simple to install
- Reliable, rugged and compact
- Smooth, silent action
- 4 Standard spider types available. 92 Shore is standard with 80, 98 and 95 on request
- Elastomeric element resistant to heat (-40°C+90°C), grease, oil and chemical agents
- Hubs in aluminium and sintered iron
- Steel and Stainless Steel hubs are available on request
Selecting the Right Coupling
The selection of coupling type depends on the installation and the type of misalignment. The three main types of misalignment encountered are:-
– Angular Misalignment is usually present to some extent on all applications, typical values 1° – 2°. Sometimes higher values are necessary
– Parallel (Radial) Misalignment is also nearly always present. A well aligned installation might have values below 0.25 mm
– Axial Misalignment (End Float) sometimes caused by thermal expansion or as a result of machine design
Other considerations include:
– Backlash Free Couplings are either one part couplings or have bolted joints. These are effective for precise positioning and to avoid wear on reversing drives.
– Torsional rigidity of couplings depends on the joining method. Types with rubber or plastic elements can be considered as torsionally soft and will have an amount of twist at rated torque.
Procedure:
– Decide if the coupling should be torsionally soft or rigid.
– Consider whether a small amount of backlash is acceptable.
– Calculate the required coupling torque.
– Make a provisional selection.
– Check that the coupling’s maximum speed is sufficient.
– Check that the coupling’s dimensions are acceptable.
Notes:
– Maximum misalignment values are extremes and should not be combined. As operating misalignment approaches the maximum, torque and power ratings should be reduced to maintain life
– The maximum axial misalignment values apply when the coupling is aligned. If axial misalignment greater than the listed maximum is required, consult Power Jacks
– The inertia values includes shafts through the bores
– When ordering please quote the coupling size and type, specify the bore and keyway sizes, and advise if puller holes or set-screws are required
– For maximum performance the screw jacks, actuators, gearboxes, motors and shafts should be carefully aligned
– Imperial (Inch) couplings on request
Contact Power Jacks with your order or technical enquiry
