® The Dentex coupling is a flexible gear coupling whose typical features are two congruent hubs with crowned teeth which transmit torque by meshing with the internal toothing of a housing component. The coupling sleeve with axially parallel involute gearing is centred at the tooth flanks of the coupling hubs. The coupling design meets the requirement to compensate radial, angular, and axial shaft displacements in order to release the neighbouring shaft bearings from non-controlled additional bearing loads. Even with the maximum permissible displacement edge contact of the teeth is excluded and there will be no periodic variation of the angular velocity. The high internal cushioning properties of the plastic material used for the coupling sleeve reduce the effect of shock loading. ® Dentex couplings are as suitable for horizontal shaft connection as they are for vertical connection, for reversing and intermittent service, and they have electrical insulating properties, a low weight, a low flywheel effect and, owing to their compactness, only little space is required for them. The steel/plastic combination also has the advantage that no lubrication by oil or grease is required; the coupling therefore does not need any maintenance. The 6,6-polyamide used for the coupling sleeve excells due to its excellent sliding and wear resistance properties especially with the combination of toughness, hardness and rigidity; it is also resistant to condensation and splash water, engine fuels, oils, greases, alcohols, esters, ketones, aliphatic and aromatic hydrocarbons and many other agents. However, substances of strongly polar character such as concentrated mineral acids, formic acid, cresol, glycol, benzyl alcohol can dissolve 6,6-polyamide at high temperature. Maximum service reliability is guaranteed at temperatures in the range from -25°C to +80°C. It is necessary to use a coupling sleeve in heat stabilised polyamide for temperature up to 140°C. Pump Drive Components ® Introduction to the Dentex Coupling Technical Detail Radial misalignment Angular misaligment Radially angular misalignment 26 #DriveLineHarmony www.jbj.co.uk/couplings.html
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