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Hennlich S.R.L

Str. Timotei Cipariu, Nr.5-7

310213 Arad

+40 257 211021

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RO(RO)

Lightweight and maintenance-free pillow block bearings in the rotor head for ultralight gyrocopters

Reliable and vibration-dampening: iglidur plain bearings and igubal pillow block bearings in the rotor head

manus® 2007

iglidur® G este soluţia problemei capului de rotor. Palele rotorului se rotesc de aproximativ 400 de ori pe minut şi astfel execută mişcări oscilante de aproximativ 30°. Ansamblu constă în două lagăre din plastic şi două inele de presiune fiecare confecţionate din iglidur® G.
Rotorul este controlat prin doi arbori longitudinali şi diagonali, totuşi sunt ocazionale mişcări de control. Aici sunt montate pe capul rotorului patru lagăre de alunecare şi inele de presiune. Alte lagăre absorb mişcările de rotaţie ale manetei de frânare. Pe lângă aceasta, sunt montate adiţional două lagăre cu talpă igubal® pentru direcţie, care amortizează vibraţiile şi compensează erorile de paralelism.
pentru toate produsele igus® utilizate, greutatea scăzută şi lipsa mentenanţei sunt criterii principale de aplicare. .

Walter Schwarz, Schwarz Industrieservice, Schwabach

Profile

What was needed: iglidur plain bearings, igubal pillow block bearings
Requirements: A lightweight and reliable bearing for the rotor head and brake lever was sought.
Industry: Aerospace, aviation industry
Success for the customer: The decision for the bearings resulted from several reasons: They are particularly vibration-dampening, insensitive to dust, low-maintenance, compact and especially light. In addition, they have high strength values and convinced the customer with their low cost.

Problem

For this ultra-light gyroplane, Schwarz Industrieservice was looking for a suitable bearing for the rotor head. The rotor blades rotate dynamically at approx. 400 revolutions per minute, performing oscillating movements of max. 30°. A grease lubrication device is provided for this purpose. The gimballed rotor head can be steered around the longitudinal and transverse axis. Only occasional steering movements occur in the process. An initial filling with grease is sufficient. A rotor brake must brake the rotor speed from approx. 200 revolutions per minute to standstill. The rotary movement of the brake lever also had to be supported.

Solution

For the bearing of the longitudinal and transverse axis of the rotor head, four plain bearings and thrust washers made of the material iglidur G were chosen. Two iglidur plain bearings were also used for the rotary movement of the brake lever for the rotor brake. The braking torque is absorbed by two iglidur thrust washers. For the control of the rotor head, two igubal pillow block bearings are used, which are vibration-dampening and compensate for misalignments.
The decision for the bearings resulted from several reasons. It is particularly vibration-dampening, insensitive to dust, low-maintenance, compact and especially light. In addition, they have high strength values. Finally, the cost-effective prices were also convincing for the choice of the iglidur G plain bearings.

Overview of iglidur plastic bearings

Overview of igubal spherical bearing technology