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- backlash-free transmission of torque
- high torsional stiffness, precision of transmission of rotational angle
- different torsional stiffness
- backlash-free shaft connection
- small dimensions, low moment of inertia
- compensation for radial, axial, and angular misalignment free of wear, maintenance-free, no standstill period
- not sensitive to temperatures between -30 °C and +100 °C, higher temperature ranges available on demand
- simple and operationally safe assembly
- economical and user-friendly due to modular system
- nominal moments between 0.4 - 5000 Nm
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Bellows Couplings
Bellows couplings combine stainless steel bellows and aluminum hubs to offer superior performance in motion control applications. The bellows are made of stainless steel, which makes them ideal for transmitting torque. Due to the bellows' thin walls, the coupling is able to flex easily while remaining rigid under torsional loads. Parallel misalignment, angular misalignment and axial motion are accommodated by bellows.
The combination of aluminum hubs with the bellows results in an extremely lightweight, low inertia coupling. Zero backlash and a long, maintenance-free life are assured since the coupling has no moving parts. An important feature of the bellows coupling is a balanced design to reduce vibration in high rpm applications.
Ruland bellows couplings are offered in six sizes with set screw or Nomar® clamp style hubs and bores ranging from 1/8" (3mm) to 1" (25mm). Stainless steel hubs, keyways, and other custom features are available by special order.
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The perfect servo coupling - Low cost | Plug-in type, variable bore diameters | Larger shaft misalignment compensation capability | Minimal mass moment of inertia
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Extensive developments of CNC technology has meant ever more dynamic and complex related driving elements are now required, and it is for this reason that Rino Industries Ltd of Chesterfield have a range of metal bellows couplings to accommodate this.
They have considerably proven their worth when used at highly controlled dynamic drives. They are used wherever two rotating opposite shafts are to be connected frictionally and backlash free. The most important characteristic of these types of couplings is that they can be mounted very easily and fixing of the hubs is affected only by simply tightening the fastening screws. This is why the couplings can also be easily mounted to inaccessible locations.
Contrary to the AK series, the AKD and AKN couplings can be supplied with adjusting spring grooves, and clamping is designed in a way as to guarantee that the torque transfer without adjusting spring grooves is absolutely backlash free, even with high speeds. Any misalignment of the shafts is therefore compensated and acoustic noise of the motor or the drive is reduced by acoustic damping.
They are highly suitable for use at numerically controlled machinery and equipment, packaging machinery and transporting equipment. Both types of couplings are within a torque range of 18-500Nm and within a shaft diameter range of 10-60mm. The couplings are also easily made to customer’s specifications.
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TOOLFLEX®
* Metal bellow-type
* Bellow made from stainless steel
* Backlash-free, torsionally stiff, maintenance-free
* Coupling for servo and linear drives, positioning systems
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Bellows Coupling BKL
Rated torque from 2-500 Nm
low cost version
self opening clamping
system optional
Bellows Coupling BKC Economy Class
Rated torque from 15-500 Nm
compact design
low cost version
self opening clamping
system optional
Bellows Coupling BK2
Rated torque from 15-1,500 Nm
easy to mount
compact and cost effective
low moment of inertia
speeds up to 40,000 RPM available
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Features of R W Bellows Couplings:
Compensates for axial, lateral and angular shaft misalignment, also causing quiet, smooth operation
High degree of torsional stiffness
Exact angular transmission of angular motion and torque, zero backlash
Infinite life
Wear and maintenance free
Easy mounting and dismounting
Low lateral stiffness
Low moment of interia
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Miniature Metal Bellows Couplings from R+W
Properties of MK Miniature Couplings:
precise transmission of angular motion and torque
zero backlash
torsionally rigid
infinite life
wear and maintenance free
compensates for axial, angular and lateral misalignment
easy assembly
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These torsionally stiff couplings serve for the connection of two shaft ends compensating for angular and parallel misanlignment as well as axial backlash. They are used for the backlash-free and precise angular drive of:
-potentiometers / angle encoders
-resolvers / transducers
-low powered drives
The mounting of the coupling onto the shaft ends is achieved by two set screws each with one cup point per hub. In the case of a smaller than indicated size of bore, an accurate transmission or peak-torque is no longer guaranteed. Larger borings can be supplied on request.
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- very low mass inertia torque
- easy for assembly
- a small space for assembly
- balanced
- special design available on request
The size of the coupling should be selected so that the nominal torque is greater than the highest torque to be regularly transmitted. (Acceleration or load torque). The shaft misalignments must not exceed the previously mentioned values. Otherwise this will limit the working life of the coupling.
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