FLENDER Gear Units
Flender
Flender Helical and Bevel-Helical Gear Units
Flender Planetary Gear Units
FlenderGear Units for Bucket Elevators
Flender Gear Units for Belt Conveyors
Flender Gear Units for Crushers
Flender Gear Units for Agitators
Flender Gear Units for Aerators
Flender Gear Units for Wet Cooling Towers
Flender Gear Units for Water Screw Pumps
Flender Gear Units for Water Turbines
Flender Gear Units for Paper Machines
Flender Gear Units for Reactors
Flender Gear Units for Sugar Mills
Flender Gear Units for Cranes
Flender Gear Units for Rotary Kilns
Flender Gear Units for Tube Mills
Flender Gear Units for Vertical Mills
Flender Gear Units for Bucket Excavators
FLENDER LOHER
Flender Loher Low voltage motors
Flender Loher High voltage motors
Flender PREPLEAT M13
Flender M140-202-861
Flender 595X595/L/ EU7
Flender MERV13
Flender 119-1360460-001-SS
Flender 800-447-000
What lasts long is still good. For more than 80 years the mechanical FLENDER couplings ensure that machine shafts are safely connected.
In almost all industrial they are known as first choice when it comes to reliability.
The high-quality industrial couplings are very well suitable for the use in many fields of application, many of them even in potentially explosive atmospheres.
The product range covers couplings of a torque range from 10 up to 10,000,000 Nm.
In brief:
FLENDER Couplings
Flender ZAPEX ZW Gear Coupling
Flender ZAPEX ZN Gear Coupling
Flender N-ARPEX All-steel Coupling
Flender N-EUPEX Pin Coupling
Flender N-EUPEX DS Pin Coupling
Flender RUPEX Pin and Bush Coupling
Flender N-BIPEX Claw Coupling
Flender ELPEX Flexible Ring Coupling
Flender ELPEX-B Rubber Tyre Coupling
Flender ELPEX-S Rubber Disc Coupling
Flender FLUDEX Fluid Coupling
Flender ARPEX All-steel Coupling
BIPEX-S Claw Coupling
Flender couplings
Flender flexible couplings
FlendeN-EUPEX Pin Coupling
Due to their torsional flexibility, Flender N-EUPEX couplings can move critical torsional vibrations away from the operating area of mechanical equipment in such a way that no negative effects on the drive train are to be expected. Flender flexible couplings N-EUPEX are made of high-quality cast iron. The flexible elements made of synthetic rubber (Buna-N) are available in different degrees of hardness for many applications.
Metal pins and flexible elements are designed so that no wear occurs when they are properly fitted.
Your benefits at a glance
Fail-safe for maximum operational reliability
Three-part type suitable for plug-in assembly and simplified replacement of elements
Choice of elastomer hardness to suit various applications
Suitable for use in potentially explosive environments; certified according to
2014/34/EU (ATEX)
High degree of availability of parts ex stock
Flender N-EUPEX DS Pin Coupling
Flender flexible couplings N-EUPEX DS do not have a fail-safe device, allowing positive disconnection of the input and output side upon failure of the flexible elements due to overload or wear. Then, the metal parts of the DS coupling can rotate freely in opposite directions.
Your benefits at a glance
Can be used universally and combined with many components of the N-EUPEX line
Disconnects driver and driven machine if elastomer fails
No fail-safe principle operation (the load is disconnected)
Suitable for use in potentially explosive environments; certified according to
2014/34/EU (ATEX)
Maintenance-free even if used in explosive atmospheres
Many types are available ex stock
Flender RUPEX Pin and Bush Coupling
Flender flexible couplings RUPEX are used as flexible compensating couplings in all applications requiring a reliable transmission of torque under harsh operating conditions. The conical seats of the buffer pins facilitate mounting and guarantee maintenance-free operation.
Robust and proven a million times
The optimized shape of the barreled buffers allows simple plug-in assembly and low circumferential backlash. Many type variants are offered, e.g., with brake disk, axial play limiting device or brake motor couplings.
Your benefits at a glance
Compact design; low weights and mass moments of inertia
Independent of direction of rotation (suitable for reversing operation)
Suitable for plug-in assembly (blind assembly, bell housing installation)
Suitable for use in potentially explosive environments; certified according to 2014/34/EU (ATEX)
Flender N-BIPEX Claw Coupling
The coupling portfolios normally found on the market consist of comparable couplings with a maximum permissible torque corresponding to twice the coupling’s nominal torque. To be on the safe side – for example during the run-up phase of an asynchronous motor with typical starting torques and tilting moments – it is often necessary to fall back on the next-largest coupling size.
If high rotational speeds or relatively large bores need to be taken into account, the market often offers costly steel solutions. The N-BIPEX copes with just these situations and offers not only higher maximum torques but also an extended range of bores.
With its cast hubs, the Flender N-BIPEX coupling allows greater freedom when designing the cam geometry, thereby laying the foundation for the innovative curved design. Unlike the milled cams typically available on the market, this design results in uniform loading of the elastomer compression bodies under all conditions and, in particular, prevents inward deformation of the cam ring due to load peaks that can cause greater wear.
Hubs made of high-quality nodular cast iron allow the Flender flexible couplings N-BIPEX to cope with high rotational speeds and critical bores. All in all, the N-BIPEX provides reserves that are considerably greater than those normally available on the market, thus achieving a significant reduction in wear.
Your benefits at a glance
High torque reserves (maximum torque = 3 × nominal torque) to effortlessly absorb torque peaks
Reduced complexity and lower storage costs due to the use of a single hub to meet all requirements
High-quality elastomers that ensure uniform load distribution and thus an optimal service life under all conditions
Suitable for use in potentially explosive environments; certified according to 2014/34/EU (ATEX)
Available with taper clamping bush
Flender torsionally rigid couplings
Flender ZAPEX ZW Gear Coupling
Double-jointed gear coupling – Nominal torque range from TKN = 1,300 Nm up to 7,200,000 Nm with 31 sizes – Temperature range: from –20 °C to +80 °C
Strong and reliable
The double-jointed gear couplings from the ZAPEX ZW series compensate for angular, parallel and axial misalignment of shafts. These Flender torsionally rigid couplings are particularly suitable for use under rough operating conditions. In addition to the standard series, couplings up to 13,500,000 Nm can be supplied.
Your benefits at a glance
Low restoring forces in the case of shaft misalignment
Suitable for both directions of rotation (reversing operation) and vertical installation
Long service life and minimal maintenance requirements
Small dimensions owing to compact design for use in confined spaces
Can be used for high shock loads; with large safety reserves
Suitable for use in potentially explosive environments; certified according to 2014/34/EU (ATEX)
Flender ZAPEX ZN Gear Coupling
Flender ZAPEX ZN couplings connect machine shafts and compensate for angular and radial misalignment. ZAPEX gear couplings from the ZN series are made of high-quality quenched and tempered steel and are manufactured according to the modular construction system.
Your benefits at a glance
Long service life and minimal maintenance requirements as a result of reliable grease lubrication of the gear teeth
Small dimensions, low weight and low mass moments of inertia are achieved by means of an intelligent design and combination of materials
Large safety reserves even at high shock loads
Maximum operational reliability through optimal tooth shape and use of high-quality materials
Suitable for horizontal mounting and, with a special design, for vertical mounting
Suitable for use in potentially explosive environments; certified according to 2014/34/EU (ATEX)
Flender ARPEX All-Steel Coupling
Flender ARPEX all-steel couplings are very compact and stand out due to their particularly good power-to-weight ratio. Their versatility makes them suitable for universal use. In these flender torsionally rigid couplings, the torque is transmitted by torsionally rigid, flexible disks. The disks are joined together with bushes and rings to form a compact disk pack which ensures easy and reliable installation.
Two disk packs connected to a spacer are capable of compensating for axial, radial and angular shaft misalignments. Couplings with one disk pack can only compensate for angular and axial misalignments.
The ARPEX coupling covers a wide range of products by means of many different series and sizes:
ARS-6 series: standard series for universal use
ARC-8 series: optimized for high torques
ARP-6 series: optimized for pump drives (according to API 610/API 671)
ARW-4/6 series: optimized for large shaft misalignments
ARF-6 series: optimized for extremely restricted space
Composite series: optimized for drives with large shaft distances
Your benefits at a glance
Compensation in angular, radial and axial shaft misalignment possible
Independent of the direction of rotation (suitable for reversing operation)
Torsionally rigid and free of circumferential backlash
Low restoring forces
Low-vibration (even with maximum permissible speeds)
Easy assembly through compact structural design
Conformity to API 610 and API 671
Suitable for use in potentially explosive environments; certified according to 2014/34/EU (ATEX)
Flender ARPEX ART Turbo Coupling
ARPEX ART high performance couplings consist of pure expertise combined with the greatest possible power density. These Flender torsionally rigid couplings are used in all high-speed drive systems that require torque transfer where shaft misalignment is occurring simultaneously.
The ARPEX ART leaves nothing to be desired in terms of both bore capacity and safety: their compact design allows them to compensate for all of the expected misalignments in a very small space and, at the same time, gives them the highest possible torque capacity, the lowest possible weight and a very good center of gravity.
The double-cardan principle used in the ARPEX ART enables very high radial offsets, even under great loads. With thin, individual disks, the reaction forces that occur with shaft misalignments remain relatively low. The disks of the ARPEX ART high-performance coupling consist of high-alloyed stainless spring steel, and all of the other coupling components are made of high- quality, heat-treated steel.
One strength of the Flender torsionally rigid couplings ARPEX ART is the achievable balance quality. This is the result of very high processing quality, extremely low production tolerances and high-precision assembly processes.
Your benefits at a glance
Lubrication of disks not required
Torque transfer with no play due to patented, positive compression screw fitting of the disk pack
High balance quality
Meets the requirements of API 671
Suitable for use in potentially explosive environments; certified according to 2014/34/EU (ATEX)
Easy assembly with factory-mounted half-couplings and/or transfer units
Low reaction forces
Installation and removal of the couplings without axial misalignment
Flender N-ARPEX All-Steel Coupling
Investment costs, lifecycle costs, power-to-weight ratio, fitness for use and the cost of purchasing couplings are key considerations for equipment manufacturers. With the introduction of the new N-ARPEX all-steel multi-disk coupling Flender is continuing the success story of the proven ARPEX series of couplings.
The Flender torsionally rigid couplings N-ARPEX are currently the most powerful couplings on the market due to the consistent further development of the ARPEX – a leap in performance that in this size could only be achieved by means of various design features. With the N-ARPEX, Flender delivers the optimum price-performance ratio.
With our all-steel couplings, the reliable transmission of torque between the shafts to be connected is backlash-free, torsionally rigid and flexurally elastic. This enables these Flender torsionally rigid couplings to compensate for axial, angular and radial misalignment. Our multi-disk couplings are not prone to wear and are maintenance-free.
The couplings have been designed for use in potentially explosive environments as defined in Directive 2014/34/EU (ATEX) and comply with the requirements in standards
API 610 and API 671.
Your benefits at a glance
Lower costs through higher performance
An optimized plate pack design and a revised component design enable transmission of very high torques and speeds.
Low bearing loads through low weight
A marked increase in bore capacities with standard hubs increases performance capability and lowers the N-ARPEX’s weight.
Versatility for maximum fitness for use
Its suitability for use at low temperatures between –50 °C and +280 °C and its high misalignment capacities of up to 1° enable the N-ARPEX to be used for many different purposes in special conditions.
Easy selection and reduction in storage costs
The bundling of the ARPEX ARS, ARC and ARP series together to make a single serie N-ARPEX ARN results in a reduction in complexity from 67 to 37 couplings. Thus, storage costs are reduced. Choosing the desired coupling is much easier.
Flender hydrodynamic couplings
Flender FLUDEX Fluid Coupling
Smooth start, overload protection, torsional vibration damping – Flender FLUDEX fluid couplings enable torque-limited start-up and have very low slippage at nominal loads. Especially within tough applications, drive components and processing machines are subject to extreme loads. Flender hydrodynamic couplings limit start and maximum torque within the drive train and serve as starting aids for the motor and as overload protection in the case of an incident. Flender hydrodynamic couplings also provide damping and separation of rotary oscillation, thereby reducing restoring forces to a minimum.
Flender hydrodynamic couplings operate according to the Föttinger principle. The coupling parts on the input and output side are not mechanically connected and are therefore wear-free. The torque is transmitted by the fluid movement in the coupling, accelerated by the radial blades. Our film illustrates the Föttinger principle as well as the operating principle of the FLUDEX coupling.
Your benefits at a glance
Soft and shock-free starting of machines and conveyor systems
Torque transmission without wear allows internal combustion engines to start up with a connected load
Torque limitation during start-up and in the case of overload protects coupled system components
Acceleration of large masses without using oversized motors
Protection of the drive against load peaks due to frequent switching procedures and reverse operation
Excellent decoupling of vibrations and shock damping
Largely torsional vibration decoupling in vibration-endangered drives
Small operating slip of the coupling at nominal load (approx. 2%)
Suitable for use in potentially explosive environments; certified according to 2014/34/EU (ATEX)
Flender railway couplings
Flender GKG cardan joint coupling
Elastic, double-jointed cardan coupling – Nominal torque range up to TKN = 5,861 Nm with 5 sizes – Temperature range: from –30 °C to +70 °C
Good connections thanks to quality
FLENDER GKG cardan couplings are elastic, double-jointed output couplings used to compensate for primary suspension misalignments in the bogie with full torque transmission between the gear unit and the powered wheel set shaft. Flender railway couplings permit very large shaft displacements and allow major misalignments between the axle and the gear unit while generating only very slight reaction forces.
FLENDER GKG coupling parts can be installed individually on the gear unit and wheel set shaft. The coupling parts come with pre-installed self-calibrated spherical bearings with protected rubber elements. These have a long service life of up to one million kilometers of vehicle travel. By screwing the brackets onto the spherical bearing pins, Flender railway couplings can be installed simply using standard tools. The spacer automatically centers itself.
Your benefits at a glance
Long service life of up to one million kilometers of vehicle travel
Spherical rubber elements permit very large shaft displacements and allow major misalignments between the axle and the gear unit
Low reaction force
Flender LBK link coupling
Elastic, double-jointed rod coupling – Nominal torque range up to TKN = 5,731 Nm with 5 sizes – Temperature range: from –30 °C to +60 °C
Good connections thanks to quality
FLENDER LBK connecting rod couplings have a split spacer and can be connected to the gear unit ultra-compactly. Radially arranged rubber elements create two hinge joints, which also make it possible to replace the elastic elements radially beneath the vehicle.
FLENDER LBK connecting rod couplings are driven using self-centering cyclo-palloid gear teeth in the “axle connection” version and flanged to the drive wheel in the “wheel connection” version.
Additionally, we offer the compact Flender railway couplings LBKZ series. In this case, one half of the coupling is a gear coupling which is integrated into the gear unit.
Your benefits at a glance
Radially arranged rubber elements also make it possible to replace the elastic elements radially beneath the vehicle
Compact connection to the gear unit is possible
Delivery possible as an assembly with FLENDER rail couplings
Parts are 100% trackable
Extensive service
Optionally available integrated into the gearbox hollow shaft
Flender MBG membrane coupling
Two-part, torsionally rigid all-steel coupling – Nominal torque range up to TKN = 9,500 Nm – Temperature range: from –30 °C to +60 °C
Good connections thanks to quality
FLENDER MBG membrane couplings are two-part, torsionally rigid all-steel couplings with excellent concentricity and outstanding balance quality because they are balanced together with the motor rotor. The concentricity and balance quality are permanently retained thanks to the optimum centering of the gear teeth on the two coupling halves.
Flender railway couplings membrane contour gives them axial yield. The screw fitting makes it possible to detach or connect the motor and gear unit simply without loosening the interference fits. FLENDER MBG couplings are maintenance-free and used to transmit torques and support the motor shaft in the gear unit.
Your benefits at a glance
High concentricity
Excellent balance quality
Maintenance-free
Optionally available with an electrically insulating design
Optionally available with sliding hub and/or engine speed sensor toothing
Delivery possible as an assembly with FLENDER rail couplings
Parts are 100% trackable
Flender ZBG gear coupling
Torsionally rigid curved-tooth coupling – Nominal torque range up to TKN = 3,000 Nm – Temperature range: from –50 °C to +55 °C
Good connections thanks to quality
Grease-lubricated FLENDER ZBG gear couplings make the best-possible contribution to safeguarding the maximum availability of your rail vehicle. Millions of kilometers of track, icy Siberian temperatures, extreme heat, maximum starting torques and revolution speeds, extremely dusty conditions, axial or radial jolts at high speeds – whatever route you use it on, the FLENDER ZBG is always in its element.
The Flender railway couplings have a robust, weight-optimized design. Heavy parts are directly attached to the motor or gear unit shafts; the coupling’s inner components compensate for any operational misalignments so that only the slightest unbalanced forces and oscillations apply. The patented slip hub protects the drive system. Sealed grease chambers prevent the lubricant from escaping and eliminate the potential fire risk.
Your benefits at a glance
Long service life and low maintenance expenses
Maintenance-free for up to three million kilometers of vehicle travel or 12 years
Wear-resistant and service-friendly with very long maintenance intervals
Main inspection combined with gear unit and motor checks
On request, initial lubricant filling can occur on delivery
Simple and rapid relubrication using the grease nipple
Good emergency running properties thanks to sealed grease reservoirs
Clear load reserves, even after extremely long running times
Optimized seal system to prevent dust from penetrating
Reliable running if the chassis is icy and at temperatures well below zero
Heat-resistant, even in extreme conditions
Flender highly flexible couplings
Flender ELPEX Flexible Ring Coupling
Flender highly flexible couplings are well-suited to connect asymmetrically operating machines. They are used preferably in periodically stimulated systems. Highly flexible, backlash-free tire coupling – Nominal torque range from TKN = 1,600 Nm up to 90,000 Nm with 9 sizes – Temperature range: from –40 °C to +80 °C
Flexible and adaptable
Owing to its low torsional stiffness and damping properties the Flender highly flexible couplings are very well suited to connecting machines with considerably non-uniform torque characteristics. Types with a fail-safe device between the flexible rings ensure emergency operation if the flexible rings are destroyed.
Your benefits at a glance
Suitable for high dynamic loads
Good damping properties
Available as a fail-safe coupling
Available as a shaft and flange coupling
Designs available that comply with API 610 and API 671
Flender ELPEX-B Rubber Tire Coupling
Highly flexible, backlash-free tire coupling – Nominal torque range from TKN = 24 Nm up to 14,500 Nm with 15 sizes – Temperature range: from –50 °C to +50 °C for natural rubber materials, from –15 °C to +70 °C for chloroprene rubber
Flexible and adaptable
Flender highly flexible couplings ELPEX-B transmit torques without circumferential backlash in machines with non-uniform torque characteristics. They are resistant to wear and maintenance-free. The hubs of the ELPEX-B couplings are made of high-quality cast iron or steel. The torque is transmitted by a flexible tire reinforced with a cord ply.
Your benefits at a glance
Compensation of very large shaft misalignments
Independent of direction of rotation (suitable for reversing operation)
The rubber tire can be replaced easily without the need to move the coupled machines
Easy mounting on the shafts is possible with taper bushes
Flender ELPEX-S Rubber Disk Coupling
Highly flexible rubber disk coupling to connect machines with high torque fluctuations – Nominal torque range from TKN = 330 Nm up to 63,000 Nm with 17 sizes – Temperature range: from –40 °C to +120 °C
Flexible and adaptable
Owing to its low torsional rigidity and damping properties the Flender highly flexible couplings ELPEX-S are very well suited to connecting machines with considerably non-uniform torque characteristics. The inside diameter of the rubber disk element is vulcanized on a flange. ELPEX-S couplings are designed as a flange/shaft connection or shaft/shaft connection as standard. The hub can take a taper bush.
Your benefits at a glance
Insulates torsional vibrations with linear torsion spring characteristics
Many kinds of flange connection are possible (including SAE)
Easy plug-in assembly even for mounting positions that are difficult to access
Types are available where the rubber disk element can be replaced without the need to move the coupled machines
Overload protection for the motor and the driven machine
Suitable for use in potentially explosive environments; certified according to 2014/34/EU (ATEX
Flender backlash-free couplings
Flender BIPEX-S Claw Coupling
Flender backlash-free couplings serve as a modular interface between motor and work machine to ensure reliable and backlash-free power transmission in servo- and positioning drives. Vibration-damping and electrically insulating claw coupling – Nominal torque range from TKN = 0.5 Nm to 655 Nm with ten sizes – Temperature range: from –50 °C to +120 °C
Backlash-free applications – easy solutions
In the area of Flender backlash-free couplings we offer you a large range of types and sizes in the two model ranges BIPEX-S und SIPEX for problem-free installation. The vibration-damping and electrically insulating plug-in BIPEX-S elastomer coupling is almost completely maintenance- and wear-free and has an exceedingly low moment of inertia. It is very compact, suitable for a range of installation requirements to different hub versions, and very easy to install.
The BIPEX-S coupling is made up of two aluminum or steel hubs and a polyurethane cam ring. Different cam ring hardness ratings allow the damping ratio and the torsional stiffness to be varied.
Your benefits at a glance
Large variety of design options for maximum flexibility
Rotational speed: max. 47,500 rpm
Compensation for shaft misalignments
Low moment of inertia
Suitable for highly dynamic applications
Vibration-damping
Flender SIPEX Metal Bellow Coupling
Backlash-free and torsion-resistant metal bellow coupling – Nominal torque range from TKN = 0.1 Nm to 5,000 Nm with 20 sizes – Temperature range: from –30 °C to +120 °C
Backlash-free applications – easy solutions
In the area of Flender backlash-free couplings we offer you a large range of types and sizes in the two model ranges BIPEX-S und SIPEX for problem-free installation. The SIPEX metal bellow coupling with high torsional stiffness for angle-preserving torque transmission is almost completely maintenance- and wear-free and has an exceedingly low moment of inertia. It is very compact, suitable for a range of installation requirements to different hub versions, and very easy to install.
The SIPEX coupling is made up of two aluminum hubs and stainless steel bellows. Its metal bellows compensate for axial, radial and angular misalignments with only low restoring forces.
Your benefits at a glance
Large variety of design options for maximum flexibility
Rotational speed: max. 15,000 rpm
Compensation for shaft misalignments
Low moment of inertia
Suitable for highly dynamic applications
Torsionally stiff, maintenance- and wear-free
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