Flexible couplings RUPEX series Siemens

Область применения

RUPEX couplings are available as a catalog standard in 26 sizes with a rated torque of between 200 Nm and 1300000 Nm.

The coupling is suitable for ambient temperatures of between –30 °C and +80 °C. By using alternative elastomer buffers the ambient temperature range can be extended to between –50 °C and +100 °C.

Frequently, the coupling is used to connect the gear shaft to the driven machine. In the case of drives without gear units, the coupling is particularly suitable for operation in rough conditions or heavy-duty drives with electric motor drive. Ventilator drives with high ventilator mass and drives in the cement industry are typical applications.

Examples of particularly safety-relevant areas of application are cable railway drives, lifting gear for crane drives or escalator drives.

Обзор

Coupling suitable for potentially explosive environments. Complies with Directive 94/9/EC for:

II 2 G T4 / T5 / T6 D120 °C

–30 °C ≤ T_a ≤ +80 °C / +50 °C / +40 °C

I M2

RUPEX pin and bush couplings link machine shafts and compensate for shaft misalignment with weak restorative forces.
The torque is conducted through elastomer buffers, so the coupling has typically flexible rubber properties.
Thanks to their robust design, RUPEX couplings are also suitable for rough operating conditions.

Дизайн

A RUPEX coupling comprises two hub sections which are mounted on the machine shafts. The hub parts are connected positively by steel pins and elastomer buffers. The coupling can be fitted with add-on parts such as brake disks or brake drums. Up to size 360, the pins and buffers are fitted on one side. From size 400 up, the pins and buffers are fitted in the hubs on alternate sides.

Materials

Hubs

• Type RWN and RWB made of grey cast iron EN-GJL-250
• Types RWS and RBS made of steel

Flange

Types RFN, RFS made of steel

Pin

Material steel 42CrMo4, surface fine-machined

Buffer material

Brake disks

• Type RWB made of EN-GJS-400 spheroidal graphite cast iron
• Type RBS made of steel

Brake drums

• Type RWB made of EN-GJL-250 grey cast iron
• Type RBS made of steel

RUPEX pin and bush coupling types

Further application-related coupling types are available. Dimension sheets for and information on these are available on request.

RUPEX pin and bush coupling types on request

Types RWN/RWS – One-sided arrangement of pins and buffers

Types RWN/RWS – Alternate-sided arrangement of pins and buffers

Types RWB/RBS with brake drum

Types RWB/RBS with brake disk

Types RFN, RFS

Функции

The motor torque is transmitted to the hub on the drive side via the shaft-hub connection, which is mostly designed as a keyway connection. With the aid of elastomer buffers mounted on steel pins, the torque is conducted to the hub on the output side.

The hub on the output side further transmits the torque to the driven machine or a gear unit located in between. Because of the primarily compression-loaded buffers, the coupling has a progressive torsional stiffness.

Особенности

RUPEX couplings can also hold loads when overloaded and are therefore especially suitable for drives for special safety and reliability requirements.

Torque shock loads and changing loads are no problem for robust, compact flexible RUPEX couplings.

The steel variant is also especially suitable for high-speed drives.

RUPEX couplings are fitted by putting together the coupling halves. Fitting with low torsional backlash is simplified by the barrel-shaped geometry of the buffers.

RUPEX couplings require little maintenance. Only the elastomer buffers, as wear parts, need be replaced and the coupled machines need not be moved to do so.

RUPEX couplings are suitable for reversing operation and horizontal and vertical fitting or fitting at any required angle.

Технические данные

Power ratings

¹⁾ The maximum speed of the respective type must be noted. For further information on permissible shaft misalignment, please see the operating instructions

All product codes listed below apply to standard buffers of NBR material in the 80 ShoreA variant.

For maximum coupling torque:
T_Kmax = 3.0 · T_KN

For overload torque:
T_KOL = 4 · T_KN

For coupling fatigue torque:
T_KW = 0.20 · T_KN

The axial misalignment may occur dynamically at frequencies up to 10Hz.

For fitting, a maximum gap dimension of S_max = S + ΔS and a minimum gap dimension of S_min = S – ΔS are permitted.

Torsional stiffness and damping

The values stated in the above table apply to a capacity utilization of 50 %, an excitation amplitude of 10 % T_KN with the frequency 10 Hz and an ambient temperature of 20 °C. Dynamic torsional stiffness is dependent on load and increases in proportion to capacity utilization. The following table shows the correction factors for different nominal loads.

C_Tdyn = C_Tdyn 50 % · FKC

The damping coefficient is Ψ = 1.4

Furthermore, torsional stiffness and damping depend on the ambient temperature and the frequency and amplitude of the torsional vibration excitation. More precise torsional stiffness and damping parameters on request.

Permitted shaft misalignment

The permitted shaft misalignment depends on the operating speed. As the speed increases, lower shaft misalignment values are permitted. The following table shows the correction factors for different speeds.
The maximum speed for the respective coupling size and type must be observed!

ΔK_perm = ΔK₁₅₀₀  · FKV

The axial misalignment may occur dynamically at frequencies up to 10 Hz. For fitting, a maximum gap dimension of S_max = S + ΔS and a minimum gap dimension of S_min = S – ΔS are permitted.

Shaft misalignments ΔK_a, ΔK_r and ΔK_w may occur simultaneously.