Elastomer Couplings I General Definition - Elastomer Couplings: Elastomer couplings can be plugged in, are backlash-free, flexible shaft couplings for small to medium torques. An elastomer spider serves as connection and compensating element with involute teeth and a high shore hardness. This is inserted in form-fit, with slight preload between two high-precision machined hubs with involutely shaped jaws. The elastomer spider can compensate slight shaft misalignments, is electrically insulating and has good oscillation dampening characteristics. Two variations with backlash-free, frictional shaft-hub connection are available as standard which ensure safe torque transfer even without keyways. Characteristics - JAKOB Elastomer Couplings: J plug-in J backlash-free S flexible J compact J oscillation dampening f different shore hardnesses J low moment of inertia J high speeds J electrically insulating J temperatures up to 120°C Coupling dimensioning: The main layout criteria are the required drive torque, the necessary torsional stiffness, the running speeds, the dampening characteristics of the coupling, and the moment of inertia. Additionally, the minimum or maximum possible shaft diameter, the admissible temperature range, operating factors, and the existing shaft misalignment (particularly the radial misalignment) must be taken into consideration. Approximation of required torque: Roughly, the required coupling torque TK can be calculated as for the following formula: Ta = drive torque [Nm] fD = torsional stiffness factor fT = temperature factor fB = operating factor The calculated coupling torque TK should not exceed the nominal torque of the selected coupling size. Short term overload up to twice the value of the nominal torque is admissible. The drive torque results from product information of drive motor or can be calculated via motor output PA. Ta = drive torque [Nm] PA = motor output [kW] nB = motor speed [min-1] Admissible temperature range for continuous operation PUR 98 Sh - A: -30°C up to +90°C PUR 72 Sh - D: -20°C up to +120°C

Elastomer Couplings I General Torsional stiffness factor fD: If an exact, accurate transfer of the torque is required, as for instance with servo drives or measuring systems, a high torsional stiffness is absolutely necessary. Here the required drive torque should be multiplied with a operating factor of at least 3 to 10 when selecting the size, or a torsionally stiff metal bellows coupling selected from the extensive coupling range in this catalogue. Operating factor fB: Due to operating factor fB application specific peculiarities, such as shock loading, are taken into consideration. Dimensions...