Engi­neers and design­ers are always look­ing for solu­tions to make their and our life eas­i­er. Espe­cial­ly in our times, which are char­ac­ter­ized by high cost pres­sure and ever more ambi­tious appli­ca­tions, flex­i­ble com­po­nents are in high demand. Com­pact, high-per­for­mance strong com­po­nents that allow for sim­ple con­struc­tive solu­tions can play an impor­tant role. Flen­der meets these require­ments with its N‑Arpex all-steel mul­ti-disc cou­pling. The suc­ces­sor to the proven Arpex cou­plings is a com­pact cou­pling solu­tion offer­ing torques up to 2 mil­lion New­ton meters.

Installation – easy as ABC

The N‑Arpex series of all-steel lam­i­na cou­plings is now com­plet­ed with stan­dard cou­plings in two ver­sions (ARN‑8 and ARN-10) , there­by deliv­er­ing up to 2 mil­lion Nm of torque . Through the eight or ten screw con­nec­tions, cou­pling diam­e­ter of up to 988 mm can be reached. For high­er torques expan­sion stages Flen­der devel­oped a con­i­cal screw con­nec­tion. Thus, assem­bly is sig­nif­i­cant­ly sim­pli­fied even in high per­for­mance ranges and can be car­ried out with­out addi­tion­al tools.
The tor­sion­al­ly rigid, all-steel, mul­ti-disc cou­pling offers a com­pact over­all design, a sig­nif­i­cant increase in per­for­mance and increased bore capac­i­ty. This allows a small­er cou­pling to offer a high­er torque trans­fer, com­pared with the pre­vi­ous mod­el Arpex. In many cas­es this allows for the appli­ca­tion of a small­er sized cou­pling. The achieved weight opti­miza­tion enables high­er, phys­i­cal para­me­ters and leads to a reduc­tion of the bear­ing load in the con­nect­ed machines. In com­bi­na­tion with the closed flange con­tour, these cou­plings can be used for periph­er­al speeds of up to 110 m per second.

One series fits all

A sin­gle series of 37 sizes cov­ers the entire torque range up to two mil­lion Nm, the pre­vi­ous mod­el need­ed 67 designs to offer that torque range. This makes the cou­pling selec­tion eas­i­er, clear­er and faster, which has a pos­i­tive impact on the order process and pro­cure­ment logistics.

The entire val­ue chain, from devel­op­ment over pro­duc­tion to the per­for­mance test on a test beds, is done in-house by Flen­der, with decades of expe­ri­ence in devel­op­ment and con­struc­tion flow­ing into each coupling.

The devil is in the detail

In the var­i­ous sec­tors, machines and sys­tems are sub­ject to a wide vari­ety of stan­dards and cer­ti­fi­ca­tions. The mate­ri­als, used in con­junc­tion with the well-thought-out over­all design of the N‑Arpex cou­plings, enable the appli­ca­tion in a tem­per­a­ture range from ‑50 to 280°C. The cou­plings are also suit­able for explo­sive envi­ron­ments and meet the require­ments of the Atex Direc­tive 2014/34 / EU and the require­ments of API 610 / ISO 13709 and API 671 / ISO 10441. Anoth­er stan­dard safe­ty fea­ture of the series is the spe­cial catch­ing device secur­ing the inter­me­di­ate spac­er in the event of plate breakage
The redesign of the cou­plings pro­vides an even high­er bore capac­i­ty allow­ing for big­ger shafts, in com­par­i­son to its pre­de­ces­sor. Anoth­er focus of devel­op­ment was on the sim­ple instal­la­tion of the cou­plings, which are avail­able in three- and five-part ver­sions. The two hub pieces at both ends are pro­vid­ed with pull-off thread­ed holes. In the case of the five-part vari­ant, the inter­me­di­ate unit is also deliv­ered pre-assem­bled. All these fea­tures sim­pli­fy han­dling and allow quick and safe instal­la­tion routines.

From mechanics into the digital world

In addi­tion to the design ben­e­fits, users prof­it from the elec­tron­ic capa­bil­i­ties offered by Flen­der. Cou­plinges or gear­box­es can be select­ed in the online tool “Dri­ve Tech­nol­o­gy Con­fig­u­ra­tor” based on the tech­ni­cal para­me­ters appro­pri­ate to their application.

The tool allows design­ers to find the right cou­pling and order it online. Flen­der can also pro­vide key design data such as 3D mod­els, dimen­sion­al draw­ings and descrip­tions. By inte­grat­ing these into suit­able design and sim­u­la­tion pro­grams, a “dig­i­tal twin” can be cre­at­ed. This gives design­ers impor­tant infor­ma­tion about suit­able cou­plings and dri­ves ear­ly in the project phase.

Although cou­plings are not among the most expen­sive parts in the dri­ve train, design­ers expect opti­mal val­ue for mon­ey and the best pos­si­ble design char­ac­ter­is­tics that meet the most strin­gent stan­dards. The N‑Arpex cou­pling gen­er­a­tion has been devel­oped meet these require­ments, fol­low­ing in the foot­steps of the very pop­u­lar Arpex series, while set­ting new bench­marks at the same time.

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