JÄGER Group devel­ops deci­sive assem­bly pro­tec­tion for rotor blade bolts


Pre­cise­ly fit­ting assem­bly of rotor blades with more than 50 bolts

Cost-effec­tive pro­tec­tion for rotor blade bolts against impacts and scratch­es

Facil­i­ta­tion of the blade align­ment dur­ing assem­bly


PP half-shells as assem­bly pro­tec­tion for rotor blade bolts

Sta­ble and cost-effec­tive mate­r­i­al

Sim­ple assem­bly prin­ci­ple via click lock


Secure pro­tec­tion of the rotor blade bolts against dam­age

Expen­sive replace­ment pro­ce­dures on run­ning sys­tems are no longer nec­es­sary

Faster ini­tial assem­bly of the rotor blades


High costs due to assem­bly dam­ages
The cost cal­cu­la­tion press­es on the sys­tem man­u­fac­tur­er from two fronts. Not only the replace­ment of the rotor blade bolt strains the cost­ing, but the actu­al exchange of the dam­aged rotor blade bolt, which must be con­duct­ed dur­ing stand­still. Thus the wind tur­bine can­not pro­duce any elec­tric­i­ty dur­ing the replace­ment, which leads to a loss of pro­ceeds. This poten­tial weak­ness in the bolt was not con­sid­ered in the ini­tial cal­cu­la­tion. There­fore, the devel­op­ment of the desired prod­uct for the bolt is now added to the ser­vic­ing items. The pres­sure to find a solu­tion is cor­re­spond­ing­ly high, which is fol­low­ing a sim­ple and resilient path both in pro­duc­tion and assem­bly.


One-klick solu­tion: Half shells

The JÄGER experts pro­pose an alter­na­tive: two half shells lock­able with each oth­er, man­u­fac­tured with injec­tion mold­ing.

After the first exchange of ideas between the engi­neers at Jäger and the devel­op­ers of the bolt man­u­fac­tur­er as well as the sys­tem man­u­fac­tur­er, the Jäger engi­neers man­u­fac­ture the first mutu­al pro­to­types with a 3D print pro­ce­dure. The pro­to­types made from draw­ings run through sev­er­al steps which form the coor­di­na­tion process with all those involved.

The basic idea seems so sim­ple and con­vinc­ing: Two half-shells hug the area of the exten­sion shaft and are con­nect­ed via a click lock. The half­shells are made of PP (polypropy­lene) and offer the right aver-age between sta­bil­i­ty and dimen­sion­al tol­er­ance of the exten­sion shaft.

In order that the bolts are cen­tered to the hub inside the through­way open­ing dur­ing the assem­bly process of the rotor blade the half-shell receives a slim, cir­cum­fer­en­tial bulge at one place. This does not only pro­tect the scratch-sen­si­tive sur­face from mate­r­i­al dam­age. The rotor blade bolt is fixed on the hub using a nut, keep­ing the pro­tec­tion of the exten­sion shaft in the sys­tem.

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