Clutches & Gearboxes RM Speed Increasing/Reducing Gearboxes 11 Dimensions RM gearboxes consist of a 2-piece cast iron casing* with helical teeth, case hardened gears and shafts. Reverse rotation units have a primary gear on the input shaft driving directly onto the secondary gear powering the output shaft. Same rotation versions have an idler gear between primary and secondary gears. There are 3 basic types of RM gearbox; RM-GR models are for close coupling to diesel prime movers and have a choice of SAE housing and rigid or flexible couplings; RM-BD models are similar to RM-GR but are fitted within an overcentre clutch in place of coupling, RM-BDS models offer independent mount units with overcentre clutch. Selection The power and torque capacity of the unit will vary according to the selected ratio. The published maximum torque figure is the theoretical permissible limit for operation during a 5000 hour period at an input speed of 2000 rpm. The maximum engine kW indicates the power that may be transmitted under normal conditions without an oil cooling system. These limits give merely an indication and ignore such factors as ambient temperature, air circulation, application, etc. RM unit selection should be made by taking input torque, and by multiplying it by the service factor applicable to the application. Examples of service factors are shown below. Service Factors 1 - Light duty : centrifugal pumps, fans, etc. 1.2 - Medium duty : 4 cylinder compressors, conveyors, hydraulic pumps, marine applications 1.5 - Heavy duty : 2 cylinder compressors, presses, cement mixers 2 - Very heavy duty : 1 cylinder compressors, mills The above factors apply only to RM gearbox units. For clutch/gearbox combinations study also the clutch service factor and maximum power/torque limitation. For assistance contact jbj technical department, telephone: 01737 767493 or email: info@jbj.co.uk Installation The RM-GR & RM-BD units have been specially designed for close coupling to industrial diesel engines and consequently are constructed with a single support bearing on the input shaft and must therefore utilise the pilot bearing available on most engines. Pilot bearings can be supplied if required. When installing an RM-BDS unit take care to mount unit with shaft axis horizontal and on common base with prime mover. Satisfactory alignment between drive coupling and input shaft should be achieved in order to avoid axial and radial loads on the input shaft. RM units may be ordered with output shaft rotated through various positions to suit customer applications. Please contact jbj technical department, telephone: 01737 767493 or email: info@jbj.co.uk for confirmation. Lubrication RM units are supplied without oil. Before use fill to maximum mark on dipstick. EP90 gear oil such as BP ENERGOL CS150 is recommended. The lubricant must be replaced after the first 100 hours use. Subsequent oil changes should be made every 1000 hours dependent upon the application, or every 12 months, whichever is the sooner. Eficiency Reverse rotation - RM “D” units offer 97% Same rotation - RM “S” units offer 95% * Except RM20 units
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