Introduction & Selection Details for JXL Couplings & Cast Iron Bellhousings JBJ Techniques Limited has long been established as a quality supplier of bellhousings and shaft couplings for hydraulic pump drives. Skilled British engineers have been manufacturing the range of JXL anti-static couplings and cast iron bellhousings in the UK since 1984, specifically for use in hazardous areas. The cast iron range of bellhousings, prefix GG is also available in high strength (SG) iron, prefix GGG, in addition we produce this range to suit NEMA motor flange dimensions without the use of adaptor plates. These bellhousings are a one-piece component founded in the UK with minimal (trace) aluminium, magnesium, titanium and zirconium content*. Final machining is effected at jbj premises in Redhill; in some instances a steel flange may be bolted to the pump mounting face to facilitate the fitment of larger pumps. The bellhousings have been subject to a 20-Joule impact test with no damage noted. The JXL range of resilient couplings is able to accept angular, radial and axial misalignment, they are torsionally resilient, non lubricating and capable of operating between temperatures of –50 degrees C and +105 degrees C. The elements are flame resistant, anti-static and have NCB acceptance for use underground in coalmines number A2032. If required, housings can be supplied with full chemical analysis and test bars. This must be requested at the time of ordering. A surcharge will apply. SELECTION * Couplings are selected on their ability to transmit torque between rotating shafts, with restricting factors being maximum speed and shaft diameter. Torque in Nm (Newton metres) = Power (Kw) X 9550 Speed (RPM) Example 18.5 kW at 1500 rpm = 18.5 x 9550 = 117.783 Nm 1500 Calculate the torque to be transmitted, determine the required service factor with reference to the duty factor chart, multiply the relevant duty factors together to give the required service factor, multiply the calculated torque by this factor to give the required coupling rating. Select the coupling size with reference to the continuous value, taking into account the bore diameters required. * See selection notes for JXL couplings and cast iron bellhousings. EQUIPMENT FOR HAZARDOUS AREAS INTRODUCTION 1
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